US20060101566A1 - Toilet flusher with novel valves and controls - Google Patents
Toilet flusher with novel valves and controls Download PDFInfo
- Publication number
- US20060101566A1 US20060101566A1 US11/215,804 US21580405A US2006101566A1 US 20060101566 A1 US20060101566 A1 US 20060101566A1 US 21580405 A US21580405 A US 21580405A US 2006101566 A1 US2006101566 A1 US 2006101566A1
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- US
- United States
- Prior art keywords
- tank
- valve
- water
- flush
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D1/00—Water flushing devices with cisterns ; Setting up a range of flushing devices or water-closets; Combinations of several flushing devices
- E03D1/30—Valves for high or low level cisterns; Their arrangement ; Flushing mechanisms in the cistern, optionally with provisions for a pre-or a post- flushing and for cutting off the flushing mechanism in case of leakage
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D1/00—Water flushing devices with cisterns ; Setting up a range of flushing devices or water-closets; Combinations of several flushing devices
- E03D1/02—High-level flushing systems
- E03D1/14—Cisterns discharging variable quantities of water also cisterns with bell siphons in combination with flushing valves
- E03D1/142—Cisterns discharging variable quantities of water also cisterns with bell siphons in combination with flushing valves in cisterns with flushing valves
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D3/00—Flushing devices operated by pressure of the water supply system flushing valves not connected to the water-supply main, also if air is blown in the water seal for a quick flushing
- E03D3/02—Self-closing flushing valves
- E03D3/06—Self-closing flushing valves with diaphragm valve and pressure chamber for retarding the valve-closing movement
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D5/00—Special constructions of flushing devices, e.g. closed flushing system
- E03D5/02—Special constructions of flushing devices, e.g. closed flushing system operated mechanically or hydraulically (or pneumatically) also details such as push buttons, levers and pull-card therefor
- E03D5/024—Operated hydraulically or pneumatically
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D5/00—Special constructions of flushing devices, e.g. closed flushing system
- E03D5/10—Special constructions of flushing devices, e.g. closed flushing system operated electrically, e.g. by a photo-cell; also combined with devices for opening or closing shutters in the bowl outlet and/or with devices for raising/or lowering seat and cover and/or for swiveling the bowl
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
- F16K31/406—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a piston
Definitions
- the present invention is directed to toilet flushing. It finds particular, although not exclusive, application in automatic tank-type flushers.
- toilet flushers The art of toilet flushers is an old and mature one. (We use the term toilet here in its broad sense, encompassing what are variously referred to as toilets, water closets, urinals, etc.) While many innovations and refinements in this art have resulted in a broad range of approaches, flush systems can still be divided into two general types. The first is the gravity type, which is used in most American domestic applications. The gravity type uses the pressure resulting from water stored in a tank to flush the bowl and provide the siphoning action by which the bowl's contents are drawn from it. The second type is the pressurized flusher, which uses line pressure more or less directly to perform flushing.
- the first is the gravity type, which is used in most American domestic applications.
- the gravity type uses the pressure resulting from water stored in a tank to flush the bowl and provide the siphoning action by which the bowl's contents are drawn from it.
- pressurized flusher which uses line pressure more or less directly to perform flushing.
- Some pressure-type flushers are of the tank type. Such flushers employ pressure tanks to which the main water-inlet conduit communicates. Water from the main inlet conduit fills the pressure tank to the point at which air in the tank reaches the main-conduit static pressure. When the system flushes, the water is driven from the tank at a pressure that is initially equal to that static pressure, without reduction by the main conduit's flow resistance. Other pressure-type flushers use no pressure tank, and the main conduit's flow resistance therefore reduces the initial flush pressure.
- European Patent Publication EPO 0 828 103 A1 illustrates a typical gravity arrangement.
- the flush-valve member is biased to a closed position, in which it prevents water in the tank from flowing to the bowl.
- a piston in the valve member's shaft is disposed in a cylinder.
- a pilot valve controls communication between the main (pressurized) water source and the cylinder. When the toilet is to be flushed, only the small amount of energy required for pilot-valve operation is expended. The resultant opening of the pilot valve admits line pressure into the cylinder. That pressure exerts a relatively large force against the piston and thereby opens the valve against bias-spring force. Pilot valves have similarly been employed to adapt pressure-type flushers to automatic operation.
- a tank-type flusher includes an intake valve (i.e., a fill valve), a diaphragm-operated flush valve, and a pressure control mechanism.
- the intake valve is connected to an external water source and is constructed to close water flow to a water storage tank at about a predefined water level in the water tank.
- the diaphragm-operated flush valve is constructed to control a flush valve member between a seated state and an unseated state allowing water discharge from the water tank into a toilet bowl.
- the pressure control mechanism is constructed and arranged, upon actuation, to reduce pressure in the pilot chamber of the diaphragm-operated flush valve to cause deformation of the diaphragm and thereby reduce pressure in the flush-valve chamber causing the water discharge.
- the intake valve includes a float constructed and arranged without any fixed coupling to any valve member.
- the intake valve includes a float arranged to freely float within a float cage and to block a relief orifice at the predefined water level.
- the pressure control mechanism is controlled by a solenoid.
- the flush valve member is constructed to move linearly within a flush valve housing.
- the flush-valve chamber is arranged to receive water pressure from the external source and to prevent the water discharge utilizing at least a portion of the water pressure.
- a tank-type flusher includes an intake valve (i.e., a fill valve), and a diaphragm-operated flush valve.
- the intake valve is constructed to close water flow from an external water source to a water storage tank when there is a predefined water level in the water tank.
- the intake valve includes a float constructed and arranged to freely float within a float cage.
- the diaphragm-operated flush valve includes a flush-valve chamber, wherein the diaphragm-operated flush valve is constructed to open upon actuation to discharge water into a toilet bowl from the water tank.
- a tank-type flusher includes an intake valve, and a diaphragm-operated flush valve.
- the intake valve is connected to an external water source and is constructed to close water flow to a water storage tank at about a predefined water level in the water tank.
- the flush valve is constructed to control position of a flush valve member movable between a seated state and an unseated state allowing water discharge from the water tank into a toilet bowl, wherein the flush valve member is biased to the unseated state by a bias member and is forced to the seated state by at least a portion of water pressure from the external source.
- the intake valve and the flush valve are located within a single housing.
- the flush-valve chamber is arranged to receive water pressure from the external source and is arranged to prevent the water discharge utilizing at least a portion of the water pressure.
- the diaphragm-operated flush valve may be controlled by a solenoid.
- the water tank may be an exposed water tank or a concealed water tank located behind a wall.
- the intake valve enables a variable water level in the tank.
- the tank-type flusher may include a vacuum breaker arranged to prevent transfer of water from the tank to a water supply.
- the tank-type flusher may include a manual actuator constructed and arranged to actuate the flush valve.
- the manual actuator may be a push button actuator.
- the push button actuator is constructed to actuate the flush valve enabling a dual water volume flush.
- the push button actuator is constructed to actuate hydraulically the flush valve.
- the tank-type flusher may include an automatic actuator constructed and arranged to actuate the flush valve.
- the automatic actuator is constructed to be triggered by a sensor.
- the sensor may register presence of an object or movement of an object.
- the sensor may be an optical sensor.
- the automatic actuator may be constructed to actuate the flush valve enabling a dual water volume flush.
- the automatic actuator may be located outside of the water tank and is constructed to actuate hydraulically the flush valve.
- the tank-type flusher may include a check valve arranged to reduce variation of closing pressure depending on water line pressure.
- the tank-type flusher may include a pressure compensated flow regulator.
- the tank-type flusher may include a wiper seal co-operatively arranged with the flush valve to prevent water leaking into the toilet bowl.
- the tank-type flusher may include a vent for controlling odor.
- pressure-type flush systems adapted for automatic operation can be simplified by providing a pressure-relief passage that extends through the flush-valve member itself. Specifically, part or the entire valve member is disposed in a pressure chamber, into which line pressure is admitted. This pressure overcomes a bias force and holds the valve member in its seated position, in which it prevents flow from the pressurized-liquid source into the bowl. To open the flush valve, it is necessary to relieve the pressure in the pressure chamber by venting it into some unpressurized space. Rather than follow the conventional approach of providing an additional pressure-relief exit from the flush mechanism, we use the flush outlet for pressure relief by providing a pressure-relief conduit that extends from the pressure chamber through the flush-valve member itself. A pressure-relief mechanism ordinarily prevents flow through this pressure-relief conduit, but it permits such flow when the toilet is to be flushed.
- FIG. 1 is a sectional view of a toilet tank illustrating its float and gravity-type flush valves.
- FIG. 1A is a more-detailed cross section of the gravity-type flush valve in its closed state.
- FIG. 1B is a similar view of the gravity-type flush valve, but in its open state.
- FIG. 1C is a cross-sectional view depicting FIG. 1 's gravity-type flush valve in more detail.
- FIG. 1D is a cross-sectional view of an alternative flush-valve arrangement, in which solenoid-control circuitry is located remotely from a solenoid located in the flush-valve assembly.
- FIG. 2 is a cross-sectional view that illustrates an embodiment in which the float- and flush-valve assemblies share common elements.
- FIG. 2A is a cross-sectional view of another embodiment, one in which the solenoid as well as the solenoid-control circuitry is located remotely from the flush-valve assembly.
- FIG. 3 is a cross-sectional view of a pressure-type embodiment.
- FIG. 3A is a more-detailed cross-sectional view of a pilot-valve for the pressure type embodiment.
- FIG. 4 is a sectional view of a toilet tank illustrating its float and gravity-type flush valves.
- FIG. 4A is a more-detailed cross section of the gravity-flush valve in its closed state.
- FIGS. 4 B and 4 B-I provide a similar view of the gravity-type flush valve, but in its open state.
- FIG. 5 is a cross-sectional view of the push-button valve of FIG. 4 .
- FIG. 5A is a cross-sectional view taken at line 5 A- 5 A in FIG. 5 .
- FIG. 6 is a sectional view of the toilet tank illustrating its float and gravity-type flush valves.
- FIG. 6A is a more-detailed cross section of the flush-valve mechanism.
- FIG. 6B is a cross-sectional view of a remote actuator valve and push button.
- FIG. 6C is a top isometric view of one of the push-button members in the push-button assembly of FIG. 3 .
- FIG. 6D is an isometric view of the button frame in FIG. 3 's push-button assembly.
- FIG. 6E is an isometric view of another button member from the push-button assembly of FIG. 6B
- FIG. 7 includes FIGS. 7A and 7B wherein FIG. 7A is a more detailed cross sectional view of FIG. 6 's float-valve assembly and FIG. 7B is a cross-sectional view of the flush-valve assembly showing a fill tube and a flow diverter.
- FIG. 8 is a cross-section of a valve that employs the present invention's teachings.
- FIG. 8A is an isometric view of a stop member employed in an alternative embodiment of the present invention.
- FIG. 8B is a plan view of the FIG. 8A embodiment with parts removed.
- FIG. 8C is an isometric view of the inner button member employed in the FIG. 8A embodiment.
- a gravity-type flush mechanism includes a fill valve mechanism 5 and a flush-valve mechanism 10 located in a toilet tank 16 .
- Toilet tank 16 is an exposed tank traditionally used in the US, or a concealed tank frequently used in the EU countries.
- FIG. 1A shows flush-valve mechanism 10 in a closed state wherein flush-valve member 12 is seated in a flush-valve seat 14 formed in the bottom of toilet tank 16 . In that seated position, the valve member 12 prevents water from the tank 16 that has entered through flush ports 18 in a flush-valve housing 20 from flowing through a flush outlet 21 and a flush conduit 22 to a toilet.
- the flush mechanism includes a bias spring 24 , which exerts a force that tends to urge flush-valve member 12 off its seat 14 . That is, flush-valve member 12 is biased to an unsealed state but remains seated between flushes due to water line pressure. This pressure that normally prevails in a flush-valve (or piston) chamber 25 because of its communication with a (pressurized-) water source conduit 26 .
- the flush-valve housing 20 's cap 27 provides this chamber, and the flush-valve member is slidable within a cylinder 28 that the cap forms.
- operation of flush valve mechanism 10 is controlled by pressure in chamber 25 using a pilot valve diaphragm 30 .
- the valve member's seal ring 29 cooperates with diaphragm 30 to prevent escape of the pressurized water from piston chamber 25 through a pressure-relief outlet 31 in chamber 25 's narrowed passage portion 32 .
- Diaphragm 30 is resiliently deformable so pressure within passage 32 tends to lift it from engagement with a pilot-valve seat 34 and a similar pressure within a pilot chamber 36 acts on diaphragm 30 in the opposite direction over a greater area.
- a solenoid 42 withdraws a second pilot-valve member 44 from a seat to enable flow through a passage 46 that leads from chamber 36 to a further passage 48 that leads to an outlet 50 .
- the flow resistance through passages 46 and 48 is much lower than that through bleed orifice 38 , so the pressure within chamber 36 drops.
- This pressure drop creates an opposite force due to pressure within passage 32 to raise diaphragm 30 off its seat, as FIG. 1B shows.
- Diaphragm 30 serves as a pressure-relief valve that lowers the water pressure within passage 32 (and thus within chamber 25 ) through a plurality of openings such as opening 51 .
- the bias spring 24 can overcome the force exerted by the pressure within chamber 25 .
- the flush-valve member 12 therefore rises, lifting its O-ring seal 52 off the main valve seat 14 and thereby allowing the tank to empty as shown in FIG. 1B .
- O-ring 52 may be replaced by a rubber or plastic seal having a wiper-shaped blade.
- the wiper-shaped blade is designed both to provide a seal on seat 14 and to clean or remove any deposits located on the surface of seat 14 .
- the design and the action of the wiper-shaped blade further helps in preventing water leaks.
- Gravity flush mechanisms are used with toilets that operate by way of suction created when the rising liquid level in the bowl drives water to the turn in a vertical conduit bend, where the pull of gravity then draws fluid down the reverse bend to siphon bowl contents out.
- the effectiveness of the desired suction depends significantly on the profile of flush-valve movement as the flush valve opens.
- the flush valves have a repeatable opening-movement profile achieved by employing bias spring 24 , which causes the valve-opening motion. This repeatable motion is then essentially independent of line pressure so long as the pressure-relief path has much less flow resistance than the path by which the chamber is repressurized.
- solenoid 42 seats valve member 44 to close flow in passages 46 and 48 again.
- the solenoid it is preferable for the solenoid to be of the latching variety as described in U.S. Pat. No. 6,293,516 (but non-latching solenoid described in U.S. Pat. No. 6,305,662 may also be used). That is, it is preferable for the solenoid to require power to change state but not to require power to remain in either state to increase battery longevity.
- valve member 44 With valve member 44 seated, the pressure above diaphragm 30 can again build to equal that below it, so diaphragm 30 again seats to cause pressure in chamber 25 to produce enough force to close this main flush valve 12 again.
- flow from FIG. 1 's main line 59 fills the tank through float-valve assembly 5 best seen in FIG. 1C .
- float valve assembly 5 uses diaphragm 63 to control water filling tank 16 .
- water from line 59 flows through main valve passage 60 formed by a valve cap 61 sealingly secured in a float-valve frame 62 .
- Fill-valve diaphragm 63 is held between valve cap 61 and a valve plug 64 threadedly secured to the valve cap 61 and also sealed to the float-valve frame 62 .
- resilient diaphragm 63 seats against a valve seat 65 that valve cap 61 forms.
- Float valve assembly 5 also includes a ball float 66 freely floating in a float cage 67 .
- the height of pressure relief orifice 68 is designed (or selected) to close the fill valve at a predefined water level.
- the resultant rising water in tank 16 eventually lifts float 66 into a position in which it blocks pressure-relief orifice 68 .
- the pressure within that chamber approaches that within passage 60 .
- that pressure acts on the diaphragm 63 's lower surface over a greater area than the same pressure does on the diaphragm's upper surface.
- the resultant upward force presses diaphragm 63 against its seat 65 and prevents further flow from the high-pressure line 59 into the tank.
- the water level at which this occurs can be adjusted by adjusting the height within frame 62 of cap 61 , plug 64 , and parts connected to them.
- a user can trigger a solenoid cycle manually by, for instance, using a push button.
- the solenoid operates automatically in response to sensed user activity.
- a control circuit 84 mounted in a water-tight enclosure 86 and powered by batteries 88 provides the solenoid drive current.
- control circuit 84 ( FIG. 1 ) generates and transmits infrared light through optic fibers 90 to a lens 92 and thereby irradiates a target region.
- Another lens 94 collects light that a target has reflected, and optic fibers 96 conduct that light to a detector in control circuit 84 .
- control circuit 84 assumes an “armed” state when a target is detected. From that armed state, the subsequent absence of a target will, possibly after some delay, result in the solenoid's causing the flush valve to open and close in the manner described above.
- FIG. 1D illustrates an embodiment of a tank type flusher having a solenoid control circuitry mounted on the tank.
- an electronics enclosure 98 may be mounted on the tank wall, above the tank's high-water line.
- Lenses 100 and 102 have the same functions as those shown in FIG. 1 's.
- the object-sensor lenses are disposed at the tank's exterior; all of the control circuitry is disposed inside the tank and inside a water-tight enclosure disposed below the tank's high-water level.
- Lenses 92 and 94 can be mounted in the same enclosure as control circuitry 104 so there is no need for optic fibers to connect the lenses to the control circuitry.
- the control circuitry is now remote from solenoid 42 , which remains in the watertight enclosure 86 . Operator wires 106 lead from control circuit 104 to solenoid 42 to enable the control circuit to operate solenoid 42 .
- FIGS. 1 and 1 D An alternative, wireless approach would be a hybrid of the approaches that FIGS. 1 and 1 D illustrate.
- Push-button or sensing circuitry in such an approach would be located remotely, as in FIG. 1D , but the solenoid-drive circuitry would be local, as in FIG. 1 .
- the remote circuitry would additionally include a wireless transmitter, and the local circuitry would include a wireless receiver responsive to the transmitter.
- the transmitter and receiver may communicate by way of low-frequency—say, 125 kHz—electromagnetic waves.
- Such electromagnetic waves may be modulated by pulse trains so encoded as to minimize the effects of spurious reception from other sources. It may be preferable in wireless approaches for at least the local receiver to be located above the water line, but this is not required.
- FIGS. 2 and 2 A illustrate an arrangement in which diaphragm 30 is controlled by a hydraulic line 108 (or a pneumatic line).
- a hydraulic line 108 or a pneumatic line.
- the passage 46 by which the pilot valve's upper chamber 36 is relieved communicates through an appropriate fitting 110 with the hydraulic line 108 .
- Another fitting 112 on a control-circuit housing 114 places the hydraulic line 108 into communication with a valve passage 116 through which a solenoid 118 controls the flow.
- solenoid 118 holds a valve member 120 in the position in which it prevents flow from passage 116 to a further passage 122 .
- the pressure in the pilot valve's upper chamber 36 would otherwise be exhausted to the tank interior by way of an exhaust hose 124 secured to another fitting 126 on the control-circuit housing 114 .
- Exhaust hose 124 is provided for those installations in which the control-circuit housing 114 is disposed outside the tank; such installations would need an exhaust hose to return water to the tank. If the housing 114 is instead mounted inside the tank (above the high-water line), such an exhaust hose is unnecessary.
- float-valve assembly 5 is provided separately from flush-valve assembly 10 .
- the embodiment of FIG. 2 has the float- and flush-valve assemblies located in a single unit.
- Frame 130 is mounted on the float-valve pilot assembly just as watertight enclosure 86 of FIG. 1 .
- Hydraulic line 108 provides communication with the remote elements, so frame 130 does not need to provide watertight protection to any local elements.
- Frame 130 serves the same function as FIG. 1C 's float-valve frame 62 . In other embodiments where it is necessary to protect local elements from water in the tank, frame 130 can be arranged to provide watertight protection.
- FIG. 3 illustrates a pressure-type flusher 135 of the tank variety.
- Pressure-type flusher 135 includes a pressure vessel 136 , a flush valve assembly and a fill valve assembly.
- Pressure vessel 136 is always under pressure introduced from main pressure line 142 .
- a flush-valve member 140 controls flow from flush valve outlet 138 into the toilet bowl.
- Flush-valve member 140 is moveable within a cylinder 144 supported by fins 146 that extend upward from the base of the pressure vessel 136 .
- a bias spring 148 acting between a ledge 150 provided by cylinder 144 and a piston head 152 formed by valve member 140 tends to lift valve member 140 off its seat 154 .
- pressure in chamber 156 is relieved by way of a pressure-relief conduit comprising a pilot-valve inlet passage 168 , a pilot-valve outlet chamber 170 , guide-tube inlet passage 172 , a guide tube 176 secured to the cap 158 by a collar 178 that the cap forms, and a bore 180 , formed by the flush-valve member 140 , that receives the guide tube 176 .
- Seals 182 on the guide tube prevent escape of fluid from chamber 156 .
- a pressure-relief valve 184 operates similarly to pilot valves previously described to control flow through the pressure-relief conduit just described. Specifically, fluid from the pilot-valve inlet passage 168 is ordinarily prevented by diaphragm 186 from flowing around an annular valve seat 188 though valve-cap openings 190 into the pilot-valve outlet chamber 170 .
- the pressure-relief mechanism's solenoid 192 raises a valve member 194 so as to relieve the pressure above diaphragm 186 through passages 196 and 198 , pressure below the diaphragm 186 lifts it off the valve seat 188 and permits relief of chamber 156 's pressure through the pressure vessel 136 's flush opening 138 .
- the illustrated flush mechanism avoids the need for a separate passage to the pressure-vessel exterior.
- the pressure type flusher of FIG. 3 includes control circuitry for controlling solenoid 192 located locally.
- solenoid 192 may be provided remotely, in a manner similar to that depicted in FIG. 2A .
- the pressure-relief passage could include conduits that are similar to FIG. 2A 's hoses 108 and 124 but communicate with the embodiment of FIG. 3 passages 196 and 198 .
- FIG. 4 illustrates another embodiment of a gravity-type flush-valve system 200 .
- gravity-type flush valve system 200 includes flush valve member 12 seated in flush-valve seat 14 formed in the bottom of toilet tank 16 . In the seated position, the valve member 12 prevents water in tank 16 that has entered through flush ports 18 in flush-valve housing 20 from flowing through flush outlet 21 and flush conduit 22 to a toilet.
- the flush mechanism includes bias spring 24 .
- Bias spring 24 exerts a force that tends to urge flush-valve member 12 off its seat 14 .
- pressure that normally prevails in chamber 25 because of its communication with pressurized-water source conduit 26 keeps the flush-valve member seated between flushes.
- the flush-valve housing 20 's cap 27 provides this chamber, and the flush-valve member is slideable within a cylinder 28 that the cap forms.
- the valve member's seal ring 29 cooperates with a pilot-valve diaphragm 30 to prevent escape of the pressurized water from the piston chamber 25 through a pressure-relief outlet 31 in chamber 25 's narrowed passage portion 32 .
- the pilot-valve diaphragm 30 is resiliently deformable, so the pressure that prevails within passage 32 would tend to lift it from engagement with the pilot-valve seat 34 if a similar pressure did not prevail within pilot chamber 36 and act on the diaphragm 30 over a greater area.
- the reason why this pressure prevails within chamber 36 is that a small orifice 38 through which pilot-valve pin 40 extends permits water to bleed into it (through a relatively high flow resistance).
- O-ring 52 may again be replaced by a rubber, polymer or plastic seal having a wiper-shaped blade.
- the wiper-shaped blade is designed both to provide a seal on seat 14 and to clean or remove any deposits located on the surface of seat 14 .
- the design and the action of the wiper-shaped blade further helps in preventing water leaks.
- FIG. 4 To cause the system to flush, the user depresses FIG. 4 's push button 202 . As will be explained in more detail below, this causes a remote pressure-relief valve 204 to permit flow to its outlet 206 from a pressure-relief tube 208 that communicates with pilot chamber 36 through passages 49 ( FIG. 4A ). This relieves pressure in chamber 36 .
- the flow resistance through that path is much lower than the bleed orifice 38 's flow resistance, so the pressure within chamber 36 drops and permits that within passage 32 to raise diaphragm 30 off its seat, as FIG. 4B shows.
- Diaphragm 30 serves as a pressure-relief valve.
- remote valve 44 closes, as will be explained below in more detail, to prevent any further flow out of chamber 36 .
- the pressure above diaphragm 30 can therefore again build to equal that below it, so diaphragm 30 again seats to cause pressure in chamber 25 to produce enough force to close the main flush valve 12 again.
- flow from main line 59 fills the tank through a float-valve assembly best seen in FIG. 4 .
- water from line 59 flows through main valve passage 60 formed by a valve cap 61 sealingly secured in a float-valve frame 62 ( FIG. 1C ).
- resilient diaphragm 63 seats against a valve seat 65 that the valve cap 61 forms.
- the pressure within passage 60 causes such a deformation of the resilient diaphragm 63 as to leave a clearance between it and the valve seat 65 .
- water from passage 60 can flow around the valve seat 65 through a valve-cap opening 69 and openings 70 in the float-valve frame 62 .
- the rising water in the tank eventually lifts the float 66 into a position in which it blocks the pressure-relief orifice 68 .
- remote valve 204 includes a movable valve member 205 actuated by button 202 , for releasing pressure in tube 208 .
- the relief tube 208 terminates in a valve inlet 210 and communicates with a main-valve entrance chamber 212 .
- Cooperating threads on a seal frame 214 and a valve core 216 secure the latter to the former, which in turn is threadedly secured to the housing 220 's interior.
- a net 222 threadedly secured to the end of the valve core 216 bears against a washer 218 that holds a screen 224 in place.
- water from the entrance chamber 212 can enter an annular space 232 sealed by an O-ring 235 that seal frame 214 holds in place against housing 220 's inner surface.
- a lip seal 234 mounted on seal frame 214 acts as a valve seat.
- closed valve state a movable valve member 205 seats against that lip seal.
- a second lip seal 242 mounted on the valve member 205 cooperates with lip seal 234 to prevent water from flowing from an outlet-passage entrance chamber 236 , with which a core port 238 provides annular space 232 communication, through an annular outlet passage 240 and out the valve outlet port 206 .
- the resultant pressure in the outlet-passage entrance chamber 236 exerts a force against the lower lip seal 242 that would tend to unseat the valve member 205 , but the valve member remains seated because equal pressure in another, seating-pressure chamber 244 acts over a greater area and thereby exerts a greater, countervailing force.
- Pressure prevails in that seating-pressure chamber because, as FIG. 5A illustrates, the valve core forms a pin passage 246 in which a fluted core pin 248 is disposed to form a high-flow-resistance flow path from main valve entrance chamber 212 through a further screen 250 into the seating-pressure chamber 244 . Acting against the core pin's enlarged head 252 , an internal lip 254 retains the core pin.
- the push button 202 is threadedly secured to an actuator rod 256 whose stop surface 258 bears against a valve-member shoulder 260 that acts as a stationary stop.
- the user overcomes the force of bias spring 262 located in a spring recess 264 formed by the valve housing 220 .
- Spring 262 exerts return force on a collar 266 formed by the actuator rod.
- valve member 205 When a user manually depresses push button 202 , the actuator rod 256 bears against valve member 205 , and the user overcomes fluid-flow resistance (explained below) and the force from the seating-pressure chamber 244 to displace the valve member 205 downward. This both unseats the valve member from the upper lip seal 234 and draws water out of the seating-pressure chamber 244 through passage 212 .
- the user opens communication between the outlet-passage entrance chamber 236 and the outlet passage 240 . That is, pressure in the pressure-relief tube is relieved through a valve flow path that includes the main entrance chamber 212 , the annular space 232 , core port 238 , the annular outlet passage 240 , and the main valve outlet port.
- An O-ring seal 266 mounted in an annular seal groove 268 that the actuator rod 256 forms prevents leakage through the spring recess 264 .
- Actuator rod 256 and valve member 205 are cooperatively constructed and arranged to relieve pressure in tube 208 and cause delay in pressure buildup after actuation.
- the actuator rod's end shaft 270 is slideable within the valve member's central passage 272 , so the bias spring 262 can urge that actuator-rod's stop surface 258 out of engagement with the valve member 205 when the user releases the push button 202 .
- the user usually releases the push button while most of the water has yet to drain from the flush tank. Therefore, there is a delay during which remote valve 204 remains open so that flush valve 205 also remains open.
- valve member 205 In remote valve 204 , valve member 205 's movement from its unseated position to its seated position increases the seating-pressure chamber's volume and thus necessitates flow into seating-pressure chamber 244 in order to return its pressure to the value that prevails at the inlet 210 and thus in the space 236 whose pressure tends to keep the valve member 205 unseated.
- the flow resistance of the passage 246 FIG. 5A ) by which that make-up must flow into the seating-pressure chamber 244 is so great that this flow causes a simplified pressure drop for several seconds.
- the force on the valve member 205 caused by the pressure within the seating-pressure chamber 244 is not great enough to overcome the force from space 236 's pressure, so the valve member 205 remains unseated for that length of time.
- FIGS. 6 and 6 A illustrate another embodiment of a gravity type flush 300 including a fill valve 302 and a flush valve 304 constructed in a unitary structure. Flusher 300 is actuated by actuator 306 .
- Flush valve 304 includes a bias spring 310 , which keeps a gravity-type flush mechanism's flush-valve member 312 separated from a flush-valve seat 314 formed on the inlet of a flush conduit 316 disposed in the bottom of a toilet tank 16 .
- a lower main housing half 320 mounted by struts 322 on the flush conduit 316 forms a pressure chamber 324 above the valve member 312 .
- Pressure chamber 324 includes a cylinder 26 within which a piston portion 28 of the valve member 312 is slideable. Chamber 324 is ordinarily under pressure because of fluid communication that a pressure line 330 provides between it and a pressurized-water supply connected to passage 448 . When that pressure prevails, it holds the valve member 312 in a seated position.
- Pressure chamber 324 's pressure ordinarily prevails because a pilot-valve diaphragm 332 secured in housing half 320 by a pilot-valve cap 333 ordinarily cooperates with the valve member's seal ring 334 to prevent escape of pressurized water from the chamber.
- the pilot-valve diaphragm 332 is resiliently deformable, so the pressure that prevails within chamber 324 would tend to lift it from engagement with a pilot-valve seat 336 and thus allow pressure relief if a similar pressure did not prevail within a pilot chamber 338 and act on the diaphragm 332 over a greater area.
- valve member 312 remains in the seated position (not shown) between flushes.
- a push button 344 ( FIG. 6B ). As will be explained in more detail below, this causes a remote pressure-relief valve 346 to permit flow to its outlet 348 from a pressure-relief tube 350 secured at its other end by a fitting 352 to a plug member 354 mounted on cap 333 . This places remote valve 346 's outlet 348 in communication with a plug member 354 's interior passage 356 ( FIGS. 6 and 6 A) and thereby with the pilot chamber 338 through passage 358 . This relieves pressure in that chamber.
- the flow resistance of the path is much lower than that of the bleed orifice 340 , by which the pilot valve's pressure is replenished, so the pressure within chamber 338 drops and permits pressure chamber 324 's pressure to raise diaphragm 332 off its seat.
- Diaphragm 332 permits the pressure within the pressure chamber 324 to be relieved through a plurality of openings such as opening 360 .
- the bias spring 310 can overcome the force exerted by the now-reduced pressure within chamber 324 .
- the flush-valve member 312 therefore rises to its open position ( FIG. 6A ), lifting its O-ring seal 362 off the main valve seat 314 and thereby allowing water from the bank to flow out through the flush conduit 316 .
- push button 344 actually is a compound button consisting of outer and inner button members 364 and 366 held in a button frame 368 by a button cap 370 .
- FIG. 6C is a top isometric view of inner button member 366 co-operatively arranged with outer button member 364 , shown in FIG. 6E .
- Button member 366 includes a central land 376 extending from a generally disk-shaped layer 378 from which four keys 380 extend radially.
- Button frame 368 ( FIG. 6D ) forms a set of sixteen partitions 382 extending radially inward. Those partitions 382 cooperate to define sixteen key guides, within any four of which keys 380 can slide.
- the button frame 368 also forms stop surfaces 384 at the bases of the key guides thus formed.
- the stop surfaces 384 in the key guides occupied by the four keys at any one time are all arranged at the same level so that they stop all four keys simultaneously. However, different sets of four stops are disposed at different levels so that placing the keys in different sets of the key guides results in different amounts of permitted button travel.
- each of the four keys 380 includes a passage 386 therethrough.
- Outer button member 364 is generally annular but forms four radially extending tabs 388 from which respective legs 390 extend. Legs 390 register with passages 384 in a sliding arrangement shown in FIG. 6B .
- outer button member 364 When the user operates push button 344 , he most often presses against outer button member 364 and thereby depresses that member until its legs 390 reach the respective key guides' stop surfaces. Outer button member 364 bears against inner button member 366 (moving it to the right in FIG. 6B causing it to deform flexible diaphragm 372 from its illustrated position, to which it is biased).
- a valve housing 392 secured to the actuator-chamber housing 374 holds in place a second flexible diaphragm 394 , which cooperates with diaphragm 372 and actuator-chamber housing 374 to form an actuator chamber.
- the actuator chamber is filled with an incompressible fluid, and button member 366 's deformation of diaphragm 372 forces the fluid through four angularly spaced openings 396 in a divider wall 398 that the actuator-chamber housing 374 forms. In flowing through openings 396 , the fluid lifts the lip of an umbrella-type check-valve member 400 snap-ft in a central divider-wall opening.
- umbrella-type check valve 400 and openings 396 are designed for fast expulsion and slow return of ejected fluid.
- the fluid's motion urges diaphragm 394 against the force of a bias spring 401 and thereby pushes to the right a valve member 402 slidably disposed in a valve channel 404 formed by valve housing 392 .
- Valve member 402 forms two annular recesses in which respective O-ring seals 406 and 408 are disposed, and rightward motion causes O-ring 408 to extend into a widened portion 410 of channel 404 and thereby break the seal that it had theretofore maintained with the channel wall.
- the duration of the delay depends on the amount of diaphragm deformation that occurred, and this in turn depends on how far button member 364 traveled.
- the amount of that travel is determined by the selection of the key guides into which that button member's keys 380 were placed; different-level stop surfaces 384 result in different amounts of travel of legs 390 before they encounter those stop surfaces, but the resultant delay is usually at least two seconds.
- the delay imposed as a result of the user's depressing only the outer button member 364 is usually so selected as not to permit the tank to empty completely but still to permit enough flushing flow for most purposes. If the user desires a fuller flush, he instead depresses the inner button member 366 's land 376 ( FIG. 6C ). Button member 366 can travel farther than member 364 ; it can travel until its keys 380 reach respective stop surfaces 384 . As a consequence, its operation causes more of the incompressible fluid to flow through the divider wall 398 , and it thus requires more of the fluid to return upon the button's release before the valve 346 returns to its closed position. More of the tank's contents therefore flow into the toilet bowl to flush it.
- FIGS. 7A and 7B provide an enlarged view of flusher 300 .
- a freely floating float 415 FIG. 7A
- That valve is mounted in an upper main-housing half 414 supported on the lower main-housing half.
- the main housing is provided in two halves so that the float-valve assembly 413 's height, and thus the level to which the tank is allowed to fill, can be adjusted by means not shown.
- a main pressure-inlet manifold 416 which feeds the conduit 330 by which pressure chamber 324 is pressurized, forms a further outlet 418 . Through this outlet it feeds a conduit 420 mounted on the upper main housing half 414 and forming at its lower edge a float-valve seat 422 .
- Formed integrally with the conduit 420 is a generally annular mouth portion 424 in which a pilot-chamber base 426 is threadedly secured. That base cooperates with the conduit 420 's mouth portion 424 to form a float-valve pilot chamber 428 and secure within it a resiliently deformable float-valve diaphragm 430 that tends to seal against the float-valve seat 422 .
- a bleed orifice in which is disposed a positioning pin 434 formed by the pilot-chamber base 426 permits fluid from the conduit 420 to enter the pilot-valve chamber 428 .
- a pilot-valve member 436 is held by the float 415 against the outlet of a pressure-relief passage 438 , the pressure in the pilot-valve chamber 428 can build up to equal the pressure in the conduit 420 and, prevailing over a larger area than the pressure from the conduit 420 , hold the float-valve diaphragm 430 seated so that it prevents the liquid in conduit 420 from flowing around the float-valve seat 422 through mouth-portion openings 440 and a port 442 to a tank-fill tube 444 .
- Fill tube 444 is designed for filling the tank, and the tank-filling flow tends to reduce the manifold pressure (i.e. line pressure). Since that pressure is what closes the flush valve, significant tank-filling flow might impair that valve's closing performance. Therefore, there is a flow restrictor 446 so that when the flush-valve member 312 is in its fully unseated position, water cannot flow at any significant rate from the fill tube 444 into the tank. Flow restrictor 446 is mounted on the flush-valve member and protrudes into the fill tube's outlet as to restrict the tube's flow area greatly.
- flush valve 304 includes a flow-rate controller 448 interposed in the flow path by which the flush-valve-closing pressure is supplied.
- the particular type of flow controller 448 is not critical, but FIG. 7B depicts one of the deformable-ring variety.
- a flow restrictor 450 disposed in the conduit cooperates with a resiliently deformable ring 452 to restrict the flow area through which pressurized water must flow to enter the pressure chamber that applies the closing force to the flush valve. If the supply pressure is relatively low, it does not greatly deform the ring, and the resultant flow area is relatively great: the already-low pressure is not reduced much in flowing through the restrictor. If the supply pressure is high, on the other hand, it deforms the ring by a greater amount and thereby restricts the flow area more significantly. So a greater pressure drop from the originally high pressure occurs. The flow-rate controller therefore reduces the pressure variation that the flush valve would otherwise experience. This reduces variation in the speed at which the flush valve closes.
- Plumbing installations can experience not only pressure variation but also total pressure loss. In the absence of the present invention, such a pressure loss would permit the flush valve to open, causing an unintended flush. But a check valve 454 is provided in pressurizer conduit 330 so that the pressure holding the flush valve closed is not lost when the line pressure is.
- FIG. 8 illustrates another embodiment of a remote actuator used with flusher 300 .
- Remote actuator 500 includes a valve 510 , which controls flow from its inlet 511 to its outlet 512 .
- the user depresses a push button 513 to open valve 510 .
- the user typically will not keep the button depressed long enough for the required flush volume to flow. But the valve 510 nonetheless remains open long enough, as will now be explained.
- push button 513 actually is a compound button consisting of outer and inner button members 514 and 516 .
- Those button members are disposed within an operator housing 518 that includes an outer housing member 520 and an inner housing member 522 threadedly secured to it.
- the outer housing member 520 forms a flange 524 that cooperates with an end cap 526 to secure the valve assembly to some support such as a toilet-tank wall.
- An actuator frame 528 is threadedly secured to the inner operator-housing member 522 and cooperates with it to clamp a flexible diaphragm 530 into position.
- Flexible diaphragm 530 urges the inner button member 516 upward in FIG. 8 , but a knee 532 that the outer operator-housing member 520 forms so engages a shoulder 534 formed by the outer button member 514 as to retain the inner button member 522 within the housing.
- a nut 535 that threadedly engages the actuator housing 528 secures a valve housing 536 to the actuator housing 528 and thereby clamps into a fixed position an annular lip 538 formed at the end of a second flexible diaphragm 540 .
- the first and second flexible diaphragms 530 and 540 form an actuator chamber divided into first and second chamber segments 542 and 544 separated by a divider wall 546 that the actuator housing 528 forms.
- the inner and outer button members 516 and 514 are so sized that a user depressing button 513 will ordinarily depress the outer button member unless he takes care to concentrate on the inner member only.
- the outer button member 514 When the outer button member 514 is depressed, it in turn presses down on the inner member's plate portion 547 , and this causes the first flexible diaphragm 530 to deform in such a manner as to reduce the volume of the first chamber segment 542 .
- the actuation chamber that segments 542 and 544 form is filled with an incompressible fluid such as distilled water, and a reduction in the first chamber segment 542 's volume causes the second segment 544 's volume to increase.
- the incompressible fluid flows from the first chamber segment 542 , through openings 548 , past the lips of a flexible check-valve member 550 , and into the second chamber segment 544 .
- the second flexible diaphragm 540 deforms downward: the second chamber segment grows in volume.
- This deformation of the second flexible diaphragm 540 occurs against the force of a compression spring 552 , which is disposed within a spring chamber 554 that the second flexible diaphragm 540 cooperates with the valve housing 536 to form. That spring bears against an actuator head 556 that in turn bears against the second flexible diaphragm 540 to bias it into the illustrated position. In that position, an O-ring 557 mounted on the actuator's shaft 58 , which is disposed within a guide 560 that the valve housing 536 forms, keeps water in the inlet 511 from flowing to the outlet 512 . A second O-ring 562 prevents inlet water from flowing into the spring chamber 554 .
- the actual closure delay depends on the orifice size, the incompressible fluid's viscosity, and the actuation-chamber size. But it additionally depends upon the degree of deformation from which the flexible diaphragms need to recover, and this in turn depends on the length of button travel.
- outer-button legs 574 move downward through plate-portion holes 575 until they meet a stop surface provided by an annular stop member 576 . The distance from legs 574 's rest position to the position of the stop member 576 thus determines the button travel when the user pushes the outer button member.
- Stop member 576 's position depends in turn on the valve's inlet pressure, as will now be explained.
- the inner operator-housing member 522 and the stop member 576 cooperate with a tension spring 580 , which is secured to them, to form a resiliently expandable stop.
- the stop defines an internal stop chamber 582 , which O-rings 583 and 584 seal.
- a check valve 585 allows fluid to flow from a pressurizer conduit 586 into chamber 582 from a pressurizer port 587 . That port communicates with the inlet 511 by way of the clearance between the actuator shaft 58 and the actuator guide 560 's wall. Pressure at the valve inlet 511 thus can pressurize the stop chamber 582 .
- the tension spring 560 tends to urge the stop member 576 toward the inner operator-housing member's lower end and thereby reduce the stop chamber's size. But the force that the inlet pressure exerts on the stop member 576 acts against the spring force and thus tends to expand the expandable stop.
- the degree of stop expansion depends on the inlet pressure: the greater that pressure is, the more the actuator stop expands. Greater stop expansion results in the button travel's being more limited and thereby in less delay before the main valve closes. This shorter closure delay tends to compensate for the greater main-valve flow rate that a higher pressure causes. That is, it reduces pressure-caused variations in the volume of liquid that a single push-button operation allows to pass through the main valve.
- the outlet pressure typically undergoes a sudden reduction when the user operates the valve and thus permits flow from the valve inlet 511 through the valve outlet 512 .
- the pressurizer check valve 585 which readily permits fluid flow from the valve outlet 512 through the pressurizer conduit 585 to the stop chamber 582 to pressurize it, retards flow through conduit 586 in the other direction. It thereby tends to keep the stop expanded to the size that the inlet pressure dictated before the valve was opened. So the stop remains expanded throughout the duration of a closure delay, i.e., throughout the time when the valve is open.
- stop chamber pressure will nonetheless adjust to inlet-chamber pressure reductions that occur while the valve is closed, because a bleed slot 588 formed in the valve member 590 's seat permits depressurization over a longer time scale.
- Other embodiments may instead provide a bleed passage 591 through the valve member rather than around it.
- FIG. 8 depicts the stop member 576 as providing a single-level stop surface, it may be advantageous to have it provide several levels of stop surface so that a choice of closure-delay range can be made while the valve is being assembled or installed.
- a stop member such as FIG. 8A 's stop member 576 may be employed for this purpose. That stop member is provided with a generally cylindrical extension 594 , from which partitions 596 extend radially inward to form key ways 598 .
- FIG. 8B which is a stop view of the valve assembly with its end plate 526 and outer operator-housing member 520 removed, show that the outer button in such an embodiment forms keys 602 that fit into four key ways spaced by equal angles from each other. As FIG. 8C shows, the inner button similarly forms keys 604 that fit into those key ways.
- FIG. 8A shows that the different key ways have different-height stop surfaces 600 .
- the heights repeat so that each key in any set of four key ways spaced by 90° from each other, such as the set that keys 604 of FIG. 8C occupy, have the same height.
- the assembler chooses the closure-delay range by selecting the 1st of four key ways into which he inserts the outer-button and inner-button keys 602 and 604 .
Abstract
A tank-type flusher includes an intake valve, i.e., a fill valve, a diaphragm-operated flush valve, and a pressure control mechanism. The intake valve is connected to an external water source and is constructed to close water flow to a water storage tank at about a predefined water level in the water tank. The diaphragm-operated flush valve is constructed to control a flush valve member between a seated state and an unseated state allowing water discharge from the water tank into a toilet bowl. There is a diaphragm, separating a flush-valve chamber and a pilot chamber, arranged to seal the flush-valve chamber and thereby maintain pressure forcing the flush valve member to the seated state preventing the water discharge from the water storage tank to the toilet bowl. The pressure control mechanism is constructed and arranged, upon actuation, to reduce pressure in the pilot chamber of the diaphragm-operated flush valve to cause deformation of the diaphragm and thereby reduce pressure in the flush-valve chamber causing the water discharge.
Description
- This application is a continuation of U.S. application Ser. No. 10/441,151, now U.S. Pat. No. 6,934,976, filed May 19, 2003, which is a continuation of PCT Application PCT/US01/43273, filed Nov. 20, 2001; which is a continuation-in-part of U.S. application Ser. No. 09/716,870, filed Nov. 20, 2000; and is a continuation-in-part of U.S. application Ser. No. 09/761,408, filed Jan. 16, 2001; and is a continuation-in-part of U.S. application Ser. No. 09/761,533, entitled filed Jan. 16, 2001; and is a continuation-in-part of PCT Application PCT/US01/11384, filed Apr. 6, 2001; and is a continuation-in-part of U.S. application Ser. No. 09/957,761 filed Sep. 21, 2001.
- 1. Field of the Invention
- The present invention is directed to toilet flushing. It finds particular, although not exclusive, application in automatic tank-type flushers.
- 2. Background Information
- The art of toilet flushers is an old and mature one. (We use the term toilet here in its broad sense, encompassing what are variously referred to as toilets, water closets, urinals, etc.) While many innovations and refinements in this art have resulted in a broad range of approaches, flush systems can still be divided into two general types. The first is the gravity type, which is used in most American domestic applications. The gravity type uses the pressure resulting from water stored in a tank to flush the bowl and provide the siphoning action by which the bowl's contents are drawn from it. The second type is the pressurized flusher, which uses line pressure more or less directly to perform flushing.
- Some pressure-type flushers are of the tank type. Such flushers employ pressure tanks to which the main water-inlet conduit communicates. Water from the main inlet conduit fills the pressure tank to the point at which air in the tank reaches the main-conduit static pressure. When the system flushes, the water is driven from the tank at a pressure that is initially equal to that static pressure, without reduction by the main conduit's flow resistance. Other pressure-type flushers use no pressure tank, and the main conduit's flow resistance therefore reduces the initial flush pressure.
- While flush-mechanism triggering has historically been performed manually, there is also a long history of interest in automatic operation. Particularly in the last couple of decades, moreover, this interest has resulted in many practical installations that have obtained the cleanliness and other benefits that automatic operation affords. As a consequence, a considerable effort has been expended in providing flush mechanisms that are well adapted to automatic operation. Automatic operation is well known in pressure-type flushers of the non-tank variety, but gravity-type flushers and pressurized flushers of the tank variety have also been adapted to automatic operation.
- European Patent Publication EPO 0 828 103 A1 illustrates a typical gravity arrangement. The flush-valve member is biased to a closed position, in which it prevents water in the tank from flowing to the bowl. A piston in the valve member's shaft is disposed in a cylinder. A pilot valve controls communication between the main (pressurized) water source and the cylinder. When the toilet is to be flushed, only the small amount of energy required for pilot-valve operation is expended. The resultant opening of the pilot valve admits line pressure into the cylinder. That pressure exerts a relatively large force against the piston and thereby opens the valve against bias-spring force. Pilot valves have similarly been employed to adapt pressure-type flushers to automatic operation.
- According to another aspect, a tank-type flusher includes an intake valve (i.e., a fill valve), a diaphragm-operated flush valve, and a pressure control mechanism. The intake valve is connected to an external water source and is constructed to close water flow to a water storage tank at about a predefined water level in the water tank. The diaphragm-operated flush valve is constructed to control a flush valve member between a seated state and an unseated state allowing water discharge from the water tank into a toilet bowl. There is a diaphragm, separating a flush-valve chamber and a pilot chamber, arranged to seal the flush-valve chamber and thereby maintain pressure forcing the flush valve member to the seated state preventing the water discharge from the water storage tank to the toilet bowl. The pressure control mechanism is constructed and arranged, upon actuation, to reduce pressure in the pilot chamber of the diaphragm-operated flush valve to cause deformation of the diaphragm and thereby reduce pressure in the flush-valve chamber causing the water discharge.
- Preferred embodiments of this aspect include one or more of the following features: The intake valve includes a float constructed and arranged without any fixed coupling to any valve member. The intake valve includes a float arranged to freely float within a float cage and to block a relief orifice at the predefined water level.
- The pressure control mechanism is controlled by a solenoid. The flush valve member is constructed to move linearly within a flush valve housing. The flush-valve chamber is arranged to receive water pressure from the external source and to prevent the water discharge utilizing at least a portion of the water pressure.
- According to another aspect, a tank-type flusher includes an intake valve (i.e., a fill valve), and a diaphragm-operated flush valve. The intake valve is constructed to close water flow from an external water source to a water storage tank when there is a predefined water level in the water tank. The intake valve includes a float constructed and arranged to freely float within a float cage. The diaphragm-operated flush valve includes a flush-valve chamber, wherein the diaphragm-operated flush valve is constructed to open upon actuation to discharge water into a toilet bowl from the water tank.
- According to yet another aspect, a tank-type flusher includes an intake valve, and a diaphragm-operated flush valve. The intake valve is connected to an external water source and is constructed to close water flow to a water storage tank at about a predefined water level in the water tank. The flush valve is constructed to control position of a flush valve member movable between a seated state and an unseated state allowing water discharge from the water tank into a toilet bowl, wherein the flush valve member is biased to the unseated state by a bias member and is forced to the seated state by at least a portion of water pressure from the external source.
- Preferred embodiments of this aspect include one or more of the following features: The intake valve and the flush valve are located within a single housing. The flush-valve chamber is arranged to receive water pressure from the external source and is arranged to prevent the water discharge utilizing at least a portion of the water pressure.
- The diaphragm-operated flush valve may be controlled by a solenoid. The water tank may be an exposed water tank or a concealed water tank located behind a wall. The intake valve enables a variable water level in the tank.
- The tank-type flusher may include a vacuum breaker arranged to prevent transfer of water from the tank to a water supply.
- The tank-type flusher may include a manual actuator constructed and arranged to actuate the flush valve. The manual actuator may be a push button actuator. The push button actuator is constructed to actuate the flush valve enabling a dual water volume flush. The push button actuator is constructed to actuate hydraulically the flush valve.
- The tank-type flusher may include an automatic actuator constructed and arranged to actuate the flush valve. The automatic actuator is constructed to be triggered by a sensor. The sensor may register presence of an object or movement of an object. The sensor may be an optical sensor. The automatic actuator may be constructed to actuate the flush valve enabling a dual water volume flush. The automatic actuator may be located outside of the water tank and is constructed to actuate hydraulically the flush valve.
- The tank-type flusher may include a check valve arranged to reduce variation of closing pressure depending on water line pressure. The tank-type flusher may include a pressure compensated flow regulator. The tank-type flusher may include a wiper seal co-operatively arranged with the flush valve to prevent water leaking into the toilet bowl. The tank-type flusher may include a vent for controlling odor.
- We have invented novel gravity-type and pressure-type flush mechanisms. In the case of the gravity-type flush valve, we have recognized that operation can be made more repeatable by simply employing a configuration that is the reverse of the one described in the above-mentioned European patent publication. Specifically, we bias our flush valve to its unseated state, in which it permits flow from the tank to the bowl, and we use line pressure to hold the flush valve shut rather than to open it. We have recognized that this approach makes it very simple to have a repeatable valve-opening profile. Also, high line pressure actually aids in preventing leakage through the flush valve, rather than tending to reduce the effectiveness of the flush-valve seal. Since the toilet's suction generation is principally dependent on that profile, and since our approach makes the bias mechanism essentially the sole determinant of that profile, our approach enables this aspect of flush operation to be largely independent of line pressure.
- We have also recognized that pressure-type flush systems adapted for automatic operation can be simplified by providing a pressure-relief passage that extends through the flush-valve member itself. Specifically, part or the entire valve member is disposed in a pressure chamber, into which line pressure is admitted. This pressure overcomes a bias force and holds the valve member in its seated position, in which it prevents flow from the pressurized-liquid source into the bowl. To open the flush valve, it is necessary to relieve the pressure in the pressure chamber by venting it into some unpressurized space. Rather than follow the conventional approach of providing an additional pressure-relief exit from the flush mechanism, we use the flush outlet for pressure relief by providing a pressure-relief conduit that extends from the pressure chamber through the flush-valve member itself. A pressure-relief mechanism ordinarily prevents flow through this pressure-relief conduit, but it permits such flow when the toilet is to be flushed.
- In both pressure- and gravity-type systems, much of the mechanism employed to operate the flush valve is typically local to the wet region. That is, it is inside the pressure vessel in the case of a pressure-type system, and it is in the tank below the high-water line in case of a gravity-type system. For automatic operation, though, at least some part, such as a lens used as part of an object sensor to collect light reflected from the object, is disposed at a remote location. So there is some communication between the local and remote regions. This communication may be totally hydraulic, wherein a pressure-relief line extends from the local region to a remote region outside the pressure vessel or outside the part of the tank interior. A remote valve controls a pressure-relief line for controlling the flush valve's operation. In this embodiment, there is no need for a sealed enclosure for the electrical components.
-
FIG. 1 is a sectional view of a toilet tank illustrating its float and gravity-type flush valves. -
FIG. 1A is a more-detailed cross section of the gravity-type flush valve in its closed state. -
FIG. 1B is a similar view of the gravity-type flush valve, but in its open state. -
FIG. 1C is a cross-sectional view depictingFIG. 1 's gravity-type flush valve in more detail. -
FIG. 1D is a cross-sectional view of an alternative flush-valve arrangement, in which solenoid-control circuitry is located remotely from a solenoid located in the flush-valve assembly. -
FIG. 2 is a cross-sectional view that illustrates an embodiment in which the float- and flush-valve assemblies share common elements. -
FIG. 2A is a cross-sectional view of another embodiment, one in which the solenoid as well as the solenoid-control circuitry is located remotely from the flush-valve assembly. -
FIG. 3 is a cross-sectional view of a pressure-type embodiment. -
FIG. 3A is a more-detailed cross-sectional view of a pilot-valve for the pressure type embodiment. -
FIG. 4 is a sectional view of a toilet tank illustrating its float and gravity-type flush valves. -
FIG. 4A is a more-detailed cross section of the gravity-flush valve in its closed state. - FIGS. 4B and 4B-I provide a similar view of the gravity-type flush valve, but in its open state.
-
FIG. 5 is a cross-sectional view of the push-button valve ofFIG. 4 . -
FIG. 5A is a cross-sectional view taken atline 5A-5A inFIG. 5 . -
FIG. 6 is a sectional view of the toilet tank illustrating its float and gravity-type flush valves. -
FIG. 6A is a more-detailed cross section of the flush-valve mechanism. -
FIG. 6B is a cross-sectional view of a remote actuator valve and push button. -
FIG. 6C is a top isometric view of one of the push-button members in the push-button assembly ofFIG. 3 . -
FIG. 6D is an isometric view of the button frame inFIG. 3 's push-button assembly. -
FIG. 6E is an isometric view of another button member from the push-button assembly ofFIG. 6B -
FIG. 7 includesFIGS. 7A and 7B whereinFIG. 7A is a more detailed cross sectional view ofFIG. 6 's float-valve assembly andFIG. 7B is a cross-sectional view of the flush-valve assembly showing a fill tube and a flow diverter. -
FIG. 8 is a cross-section of a valve that employs the present invention's teachings. -
FIG. 8A is an isometric view of a stop member employed in an alternative embodiment of the present invention. -
FIG. 8B is a plan view of theFIG. 8A embodiment with parts removed. -
FIG. 8C is an isometric view of the inner button member employed in theFIG. 8A embodiment. - Referring to
FIG. 1 , a gravity-type flush mechanism includes afill valve mechanism 5 and a flush-valve mechanism 10 located in atoilet tank 16.Toilet tank 16 is an exposed tank traditionally used in the US, or a concealed tank frequently used in the EU countries.FIG. 1A shows flush-valve mechanism 10 in a closed state wherein flush-valve member 12 is seated in a flush-valve seat 14 formed in the bottom oftoilet tank 16. In that seated position, thevalve member 12 prevents water from thetank 16 that has entered throughflush ports 18 in a flush-valve housing 20 from flowing through aflush outlet 21 and aflush conduit 22 to a toilet. - The flush mechanism includes a
bias spring 24, which exerts a force that tends to urge flush-valve member 12 off itsseat 14. That is, flush-valve member 12 is biased to an unsealed state but remains seated between flushes due to water line pressure. This pressure that normally prevails in a flush-valve (or piston)chamber 25 because of its communication with a (pressurized-)water source conduit 26. The flush-valve housing 20'scap 27 provides this chamber, and the flush-valve member is slidable within acylinder 28 that the cap forms. - Referring to
FIGS. 1A and 1B , operation offlush valve mechanism 10 is controlled by pressure inchamber 25 using apilot valve diaphragm 30. The valve member'sseal ring 29 cooperates withdiaphragm 30 to prevent escape of the pressurized water frompiston chamber 25 through a pressure-relief outlet 31 inchamber 25's narrowedpassage portion 32.Diaphragm 30 is resiliently deformable so pressure withinpassage 32 tends to lift it from engagement with a pilot-valve seat 34 and a similar pressure within apilot chamber 36 acts ondiaphragm 30 in the opposite direction over a greater area. There is asmall orifice 38 through which a pilot-valve pin 40 extends, andorifice 38 permits water to bleed into it (through a relatively high flow resistance) to equalize the pressure. Due to a greater surface area ofdiaphragm 30 inchamber 36 there is a net force that keepsdiaphragm 30 seated atseat 34. - To cause the system to flush, a
solenoid 42 withdraws a second pilot-valve member 44 from a seat to enable flow through apassage 46 that leads fromchamber 36 to a further passage 48 that leads to anoutlet 50. The flow resistance throughpassages 46 and 48 is much lower than that throughbleed orifice 38, so the pressure withinchamber 36 drops. This pressure drop creates an opposite force due to pressure withinpassage 32 to raisediaphragm 30 off its seat, asFIG. 1B shows.Diaphragm 30 serves as a pressure-relief valve that lowers the water pressure within passage 32 (and thus within chamber 25) through a plurality of openings such asopening 51. As a consequence, thebias spring 24 can overcome the force exerted by the pressure withinchamber 25. The flush-valve member 12 therefore rises, lifting its O-ring seal 52 off themain valve seat 14 and thereby allowing the tank to empty as shown inFIG. 1B . - Importantly, O-
ring 52 may be replaced by a rubber or plastic seal having a wiper-shaped blade. The wiper-shaped blade is designed both to provide a seal onseat 14 and to clean or remove any deposits located on the surface ofseat 14. The design and the action of the wiper-shaped blade further helps in preventing water leaks. - Gravity flush mechanisms are used with toilets that operate by way of suction created when the rising liquid level in the bowl drives water to the turn in a vertical conduit bend, where the pull of gravity then draws fluid down the reverse bend to siphon bowl contents out. The effectiveness of the desired suction depends significantly on the profile of flush-valve movement as the flush valve opens. In the present embodiments, the flush valves have a repeatable opening-movement profile achieved by employing
bias spring 24, which causes the valve-opening motion. This repeatable motion is then essentially independent of line pressure so long as the pressure-relief path has much less flow resistance than the path by which the chamber is repressurized. - Referring again to
FIG. 1 , aftertank 16 is emptied, solenoid 42seats valve member 44 to close flow inpassages 46 and 48 again. At least when the system is battery-operated, it is preferable for the solenoid to be of the latching variety as described in U.S. Pat. No. 6,293,516 (but non-latching solenoid described in U.S. Pat. No. 6,305,662 may also be used). That is, it is preferable for the solenoid to require power to change state but not to require power to remain in either state to increase battery longevity. Withvalve member 44 seated, the pressure abovediaphragm 30 can again build to equal that below it, sodiaphragm 30 again seats to cause pressure inchamber 25 to produce enough force to close this mainflush valve 12 again. As a result, flow fromFIG. 1 'smain line 59 fills the tank through float-valve assembly 5 best seen inFIG. 1C . - Referring to
FIG. 1C ,float valve assembly 5 usesdiaphragm 63 to controlwater filling tank 16. Specifically, water fromline 59 flows through main valve passage 60 formed by avalve cap 61 sealingly secured in a float-valve frame 62. Fill-valve diaphragm 63 is held betweenvalve cap 61 and avalve plug 64 threadedly secured to thevalve cap 61 and also sealed to the float-valve frame 62. At rest,resilient diaphragm 63 seats against avalve seat 65 thatvalve cap 61 forms.Float valve assembly 5 also includes aball float 66 freely floating in afloat cage 67. So long asball float 66 does not plug a pressure-relief orifice 68, the pressure within passage 60 causes such a deformation of theresilient diaphragm 63 as to leave a clearance between it and thevalve seat 65. Thus, water from a passage 60 can flow around thevalve seat 65 through a valve-cap opening 69 andopenings 70 in the float-valve frame 62. - The height of pressure relief orifice 68 is designed (or selected) to close the fill valve at a predefined water level. The resultant rising water in
tank 16 eventually lifts float 66 into a position in which it blocks pressure-relief orifice 68. This prevents the escape of water that has bled through a high-flow-resistance orifice 71 into achamber 72 formed bydiaphragm 63 withvalve plug 64. Thus, the pressure within that chamber approaches that within passage 60. Moreover, that pressure acts on thediaphragm 63's lower surface over a greater area than the same pressure does on the diaphragm's upper surface. The resultant upward force presses diaphragm 63 against itsseat 65 and prevents further flow from the high-pressure line 59 into the tank. In the illustrated embodiment, the water level at which this occurs can be adjusted by adjusting the height withinframe 62 ofcap 61, plug 64, and parts connected to them. - A user can trigger a solenoid cycle manually by, for instance, using a push button. Alternatively, the solenoid operates automatically in response to sensed user activity. For instance, a
control circuit 84 mounted in a water-tight enclosure 86 and powered bybatteries 88 provides the solenoid drive current. To determine when to drive the solenoid, control circuit 84 (FIG. 1 ) generates and transmits infrared light throughoptic fibers 90 to alens 92 and thereby irradiates a target region. Anotherlens 94 collects light that a target has reflected, andoptic fibers 96 conduct that light to a detector incontrol circuit 84. Typically,control circuit 84 assumes an “armed” state when a target is detected. From that armed state, the subsequent absence of a target will, possibly after some delay, result in the solenoid's causing the flush valve to open and close in the manner described above. -
FIG. 1D illustrates an embodiment of a tank type flusher having a solenoid control circuitry mounted on the tank. For example, anelectronics enclosure 98 may be mounted on the tank wall, above the tank's high-water line.Lenses FIG. 1 's. In theFIG. 1 arrangement, the object-sensor lenses are disposed at the tank's exterior; all of the control circuitry is disposed inside the tank and inside a water-tight enclosure disposed below the tank's high-water level.Lenses control circuitry 104 so there is no need for optic fibers to connect the lenses to the control circuitry. However, the control circuitry is now remote fromsolenoid 42, which remains in thewatertight enclosure 86.Operator wires 106 lead fromcontrol circuit 104 tosolenoid 42 to enable the control circuit to operatesolenoid 42. - An alternative, wireless approach would be a hybrid of the approaches that
FIGS. 1 and 1 D illustrate. Push-button or sensing circuitry in such an approach would be located remotely, as inFIG. 1D , but the solenoid-drive circuitry would be local, as inFIG. 1 . The remote circuitry would additionally include a wireless transmitter, and the local circuitry would include a wireless receiver responsive to the transmitter. For example, the transmitter and receiver may communicate by way of low-frequency—say, 125 kHz—electromagnetic waves. Such electromagnetic waves may be modulated by pulse trains so encoded as to minimize the effects of spurious reception from other sources. It may be preferable in wireless approaches for at least the local receiver to be located above the water line, but this is not required. - Whereas the
FIG. 1D arrangement employs theoperator wires 106 to couple the remote control elements to the local ones,FIGS. 2 and 2 A illustrate an arrangement in which diaphragm 30 is controlled by a hydraulic line 108 (or a pneumatic line). In the embodiment ofFIG. 2A , thepassage 46 by which the pilot valve'supper chamber 36 is relieved communicates through anappropriate fitting 110 with thehydraulic line 108. Another fitting 112 on a control-circuit housing 114 places thehydraulic line 108 into communication with avalve passage 116 through which asolenoid 118 controls the flow. - In one state,
solenoid 118 holds avalve member 120 in the position in which it prevents flow frompassage 116 to afurther passage 122. The pressure in the pilot valve'supper chamber 36 would otherwise be exhausted to the tank interior by way of anexhaust hose 124 secured to another fitting 126 on the control-circuit housing 114.Exhaust hose 124 is provided for those installations in which the control-circuit housing 114 is disposed outside the tank; such installations would need an exhaust hose to return water to the tank. If thehousing 114 is instead mounted inside the tank (above the high-water line), such an exhaust hose is unnecessary. - In the embodiment of
FIG. 1 float-valve assembly 5 is provided separately from flush-valve assembly 10. Alternatively, the embodiment ofFIG. 2 has the float- and flush-valve assemblies located in a single unit. Frame 130 is mounted on the float-valve pilot assembly just aswatertight enclosure 86 ofFIG. 1 .Hydraulic line 108 provides communication with the remote elements, so frame 130 does not need to provide watertight protection to any local elements. Frame 130 serves the same function asFIG. 1C 's float-valve frame 62. In other embodiments where it is necessary to protect local elements from water in the tank, frame 130 can be arranged to provide watertight protection. - According to another embodiment,
FIG. 3 illustrates a pressure-type flusher 135 of the tank variety. Pressure-type flusher 135 includes apressure vessel 136, a flush valve assembly and a fill valve assembly.Pressure vessel 136 is always under pressure introduced frommain pressure line 142. A flush-valve member 140 controls flow fromflush valve outlet 138 into the toilet bowl. Flush-valve member 140 is moveable within acylinder 144 supported byfins 146 that extend upward from the base of thepressure vessel 136. Abias spring 148 acting between aledge 150 provided bycylinder 144 and apiston head 152 formed byvalve member 140 tends to liftvalve member 140 off itsseat 154. The pressure in achamber 156 formed bycylinder 144 betweenpiston head 152 and acap 158 keeps the flush-valve member 140 in the illustrated position, in which it squeezes an O-ring seal 160 against thevalve seat 154.Seals 162 on the piston head and 164 on the cap help to prevent the escape from thechamber 156 of pressurized water that has been introduced into it by way of aninput pressure line 166. - To cause the mechanism to flush, pressure in
chamber 156 is relieved by way of a pressure-relief conduit comprising a pilot-valve inlet passage 168, a pilot-valve outlet chamber 170, guide-tube inlet passage 172, aguide tube 176 secured to thecap 158 by acollar 178 that the cap forms, and abore 180, formed by the flush-valve member 140, that receives theguide tube 176.Seals 182 on the guide tube prevent escape of fluid fromchamber 156. - A pressure-
relief valve 184 operates similarly to pilot valves previously described to control flow through the pressure-relief conduit just described. Specifically, fluid from the pilot-valve inlet passage 168 is ordinarily prevented by diaphragm 186 from flowing around anannular valve seat 188 though valve-cap openings 190 into the pilot-valve outlet chamber 170. When the pressure-relief mechanism'ssolenoid 192 raises avalve member 194 so as to relieve the pressure abovediaphragm 186 throughpassages diaphragm 186 lifts it off thevalve seat 188 and permits relief ofchamber 156's pressure through thepressure vessel 136'sflush opening 138. By thus relieving the chamber pressure through the valve member itself, the illustrated flush mechanism avoids the need for a separate passage to the pressure-vessel exterior. - The pressure type flusher of
FIG. 3 includes control circuitry for controllingsolenoid 192 located locally. According to another embodiment,solenoid 192 may be provided remotely, in a manner similar to that depicted inFIG. 2A . The pressure-relief passage could include conduits that are similar toFIG. 2A 'shoses FIG. 3 passages -
FIG. 4 illustrates another embodiment of a gravity-type flush-valve system 200. Similarly as shown inFIGS. 1A and 1B , gravity-typeflush valve system 200 includesflush valve member 12 seated in flush-valve seat 14 formed in the bottom oftoilet tank 16. In the seated position, thevalve member 12 prevents water intank 16 that has entered throughflush ports 18 in flush-valve housing 20 from flowing throughflush outlet 21 andflush conduit 22 to a toilet. - As
FIG. 4A shows, the flush mechanism includesbias spring 24.Bias spring 24 exerts a force that tends to urge flush-valve member 12 off itsseat 14. But pressure that normally prevails inchamber 25 because of its communication with pressurized-water source conduit 26 keeps the flush-valve member seated between flushes. The flush-valve housing 20'scap 27 provides this chamber, and the flush-valve member is slideable within acylinder 28 that the cap forms. - The valve member's
seal ring 29 cooperates with a pilot-valve diaphragm 30 to prevent escape of the pressurized water from thepiston chamber 25 through a pressure-relief outlet 31 inchamber 25's narrowedpassage portion 32. The pilot-valve diaphragm 30 is resiliently deformable, so the pressure that prevails withinpassage 32 would tend to lift it from engagement with the pilot-valve seat 34 if a similar pressure did not prevail withinpilot chamber 36 and act on thediaphragm 30 over a greater area. The reason why this pressure prevails withinchamber 36 is that asmall orifice 38 through which pilot-valve pin 40 extends permits water to bleed into it (through a relatively high flow resistance). - In this embodiment, O-
ring 52 may again be replaced by a rubber, polymer or plastic seal having a wiper-shaped blade. The wiper-shaped blade is designed both to provide a seal onseat 14 and to clean or remove any deposits located on the surface ofseat 14. The design and the action of the wiper-shaped blade further helps in preventing water leaks. - To cause the system to flush, the user depresses
FIG. 4 'spush button 202. As will be explained in more detail below, this causes a remote pressure-relief valve 204 to permit flow to itsoutlet 206 from a pressure-relief tube 208 that communicates withpilot chamber 36 through passages 49 (FIG. 4A ). This relieves pressure inchamber 36. The flow resistance through that path is much lower than thebleed orifice 38's flow resistance, so the pressure withinchamber 36 drops and permits that withinpassage 32 to raisediaphragm 30 off its seat, asFIG. 4B shows.Diaphragm 30 serves as a pressure-relief valve. Specifically, it permits the pressure within thepassage 32 and thus withinchamber 25 to be relieved through a plurality of openings such asopening 53. As a consequence,bias spring 24 can overcome the force exerted by the pressure withinchamber 25. Flush-valve member 12 (FIG. 4 ) therefore rises, lifting its O-ring seal 52 off themain valve seat 14 and thereby allowing the tank to empty. - After the tank empties,
remote valve 44 closes, as will be explained below in more detail, to prevent any further flow out ofchamber 36. The pressure abovediaphragm 30 can therefore again build to equal that below it, sodiaphragm 30 again seats to cause pressure inchamber 25 to produce enough force to close the mainflush valve 12 again. As a result, flow frommain line 59 fills the tank through a float-valve assembly best seen inFIG. 4 . Specifically, as described above, water fromline 59 flows through main valve passage 60 formed by avalve cap 61 sealingly secured in a float-valve frame 62 (FIG. 1C ). - Referring to
FIG. 1C , at rest,resilient diaphragm 63 seats against avalve seat 65 that thevalve cap 61 forms. At low water level, the pressure within passage 60 causes such a deformation of theresilient diaphragm 63 as to leave a clearance between it and thevalve seat 65. Thus, water from passage 60 can flow around thevalve seat 65 through a valve-cap opening 69 andopenings 70 in the float-valve frame 62. The rising water in the tank eventually lifts thefloat 66 into a position in which it blocks the pressure-relief orifice 68. This prevents the to escape of water that has bled through a high-flow-resistance orifice 71 into achamber 72 that thediaphragm 63 forms with thevalve plug 64. Then, the pressure within that chamber approaches that within the passage 60. Moreover, that pressure acts on thediaphragm 63's lower surface over a greater area than the same pressure does on the diaphragm's upper surface. The resultant upward force presses thediaphragm 63 against itsseat 65 and prevents further flow from the high-pressure line 59 into the tank. - Referring to
FIG. 5 ,remote valve 204 includes amovable valve member 205 actuated bybutton 202, for releasing pressure intube 208. Therelief tube 208 terminates in a valve inlet 210 and communicates with a main-valve entrance chamber 212. Cooperating threads on aseal frame 214 and avalve core 216 secure the latter to the former, which in turn is threadedly secured to thehousing 220's interior. A net 222 threadedly secured to the end of thevalve core 216 bears against awasher 218 that holds ascreen 224 in place. By flowing through the screen, water from theentrance chamber 212 can enter anannular space 232 sealed by an O-ring 235 thatseal frame 214 holds in place againsthousing 220's inner surface. - A
lip seal 234 mounted onseal frame 214 acts as a valve seat. In the illustrated, closed valve state amovable valve member 205 seats against that lip seal. When the valve is thus closed, asecond lip seal 242 mounted on thevalve member 205 cooperates withlip seal 234 to prevent water from flowing from an outlet-passage entrance chamber 236, with which acore port 238 providesannular space 232 communication, through an annular outlet passage 240 and out thevalve outlet port 206. - The resultant pressure in the outlet-
passage entrance chamber 236 exerts a force against thelower lip seal 242 that would tend to unseat thevalve member 205, but the valve member remains seated because equal pressure in another, seating-pressure chamber 244 acts over a greater area and thereby exerts a greater, countervailing force. Pressure prevails in that seating-pressure chamber because, asFIG. 5A illustrates, the valve core forms apin passage 246 in which afluted core pin 248 is disposed to form a high-flow-resistance flow path from mainvalve entrance chamber 212 through afurther screen 250 into the seating-pressure chamber 244. Acting against the core pin's enlarged head 252, an internal lip 254 retains the core pin. - The
push button 202 is threadedly secured to anactuator rod 256 whosestop surface 258 bears against a valve-member shoulder 260 that acts as a stationary stop. When depressingbutton 202, the user overcomes the force ofbias spring 262 located in aspring recess 264 formed by thevalve housing 220.Spring 262 exerts return force on acollar 266 formed by the actuator rod. - When a user manually depresses
push button 202, theactuator rod 256 bears againstvalve member 205, and the user overcomes fluid-flow resistance (explained below) and the force from the seating-pressure chamber 244 to displace thevalve member 205 downward. This both unseats the valve member from theupper lip seal 234 and draws water out of the seating-pressure chamber 244 throughpassage 212. By unseating the valve, the user opens communication between the outlet-passage entrance chamber 236 and the outlet passage 240. That is, pressure in the pressure-relief tube is relieved through a valve flow path that includes themain entrance chamber 212, theannular space 232,core port 238, the annular outlet passage 240, and the main valve outlet port. An O-ring seal 266 mounted in anannular seal groove 268 that theactuator rod 256 forms prevents leakage through thespring recess 264. -
Actuator rod 256 andvalve member 205 are cooperatively constructed and arranged to relieve pressure intube 208 and cause delay in pressure buildup after actuation. The actuator rod'send shaft 270 is slideable within the valve member's central passage 272, so thebias spring 262 can urge that actuator-rod'sstop surface 258 out of engagement with thevalve member 205 when the user releases thepush button 202. The user usually releases the push button while most of the water has yet to drain from the flush tank. Therefore, there is a delay during whichremote valve 204 remains open so thatflush valve 205 also remains open. Inremote valve 204,valve member 205's movement from its unseated position to its seated position increases the seating-pressure chamber's volume and thus necessitates flow into seating-pressure chamber 244 in order to return its pressure to the value that prevails at the inlet 210 and thus in thespace 236 whose pressure tends to keep thevalve member 205 unseated. However, the flow resistance of the passage 246 (FIG. 5A ) by which that make-up must flow into the seating-pressure chamber 244 is so great that this flow causes a simplified pressure drop for several seconds. As a consequence, the force on thevalve member 205 caused by the pressure within the seating-pressure chamber 244 is not great enough to overcome the force fromspace 236's pressure, so thevalve member 205 remains unseated for that length of time. - The precise duration of the delay between the user's release if the
push button 202 and the valve members seating—and thus of the flush valve's closing—depends to a great extent on the difference between the seating-pressure chambers volumes in the two states. This in turn depends on the travel permitted by the illustrated valve-closed distance between thepush button 202'sstop surface 280 and the housing'send lip 282. Asetscrew 284 enables installation personnel to adjust that distance and thereby the length of time for which the flush valve is open. Therefore,remote valve 204 can vary flush duration by adjustably selecting the timeflush valve 10 is opened. -
FIGS. 6 and 6 A illustrate another embodiment of agravity type flush 300 including afill valve 302 and aflush valve 304 constructed in a unitary structure.Flusher 300 is actuated byactuator 306.Flush valve 304 includes abias spring 310, which keeps a gravity-type flush mechanism's flush-valve member 312 separated from a flush-valve seat 314 formed on the inlet of aflush conduit 316 disposed in the bottom of atoilet tank 16. AsFIG. 6A shows in more detail, a lowermain housing half 320 mounted bystruts 322 on theflush conduit 316 forms apressure chamber 324 above thevalve member 312.Pressure chamber 324 includes acylinder 26 within which apiston portion 28 of thevalve member 312 is slideable.Chamber 324 is ordinarily under pressure because of fluid communication that apressure line 330 provides between it and a pressurized-water supply connected topassage 448. When that pressure prevails, it holds thevalve member 312 in a seated position. -
Pressure chamber 324's pressure ordinarily prevails because a pilot-valve diaphragm 332 secured inhousing half 320 by a pilot-valve cap 333 ordinarily cooperates with the valve member'sseal ring 334 to prevent escape of pressurized water from the chamber. The pilot-valve diaphragm 332 is resiliently deformable, so the pressure that prevails withinchamber 324 would tend to lift it from engagement with a pilot-valve seat 336 and thus allow pressure relief if a similar pressure did not prevail within a pilot chamber 338 and act on thediaphragm 332 over a greater area. The reason why this pressure prevails within the pilot chamber 338 is that asmall orifice 340 through which a pilot-valve pin 342 formed bycap 333 extends permits water to bleed (through a relatively high flow resistance) into the pilot chamber. Thus,valve member 312 remains in the seated position (not shown) between flushes. - To cause the system to flush, the user depresses a push button 344 (
FIG. 6B ). As will be explained in more detail below, this causes a remote pressure-relief valve 346 to permit flow to itsoutlet 348 from a pressure-relief tube 350 secured at its other end by a fitting 352 to aplug member 354 mounted oncap 333. This placesremote valve 346'soutlet 348 in communication with aplug member 354's interior passage 356 (FIGS. 6 and 6 A) and thereby with the pilot chamber 338 through passage 358. This relieves pressure in that chamber. The flow resistance of the path is much lower than that of thebleed orifice 340, by which the pilot valve's pressure is replenished, so the pressure within chamber 338 drops and permitspressure chamber 324's pressure to raisediaphragm 332 off its seat. -
Diaphragm 332 permits the pressure within thepressure chamber 324 to be relieved through a plurality of openings such asopening 360. As a consequence, thebias spring 310 can overcome the force exerted by the now-reduced pressure withinchamber 324. The flush-valve member 312 therefore rises to its open position (FIG. 6A ), lifting its O-ring seal 362 off themain valve seat 314 and thereby allowing water from the bank to flow out through theflush conduit 316. - The user typically doesn't keep the
push button 344 depressed long enough for the required flush volume to flow fromtank 16 to the toilet bowl. However,remote valve 346 nonetheless remains open long enough. Referring toFIG. 6B ,push button 344 actually is a compound button consisting of outer andinner button members button frame 368 by abutton cap 370. Aflexible diaphragm 372 secured tobutton frame 368 by an actuator-chamber housing 374 biasesinner button 366 to the illustrated rest position, in which it additionally holds theouter button member 364 in its rest position. -
FIG. 6C is a top isometric view ofinner button member 366 co-operatively arranged withouter button member 364, shown inFIG. 6E .Button member 366 includes acentral land 376 extending from a generally disk-shapedlayer 378 from which fourkeys 380 extend radially. Button frame 368 (FIG. 6D ) forms a set of sixteenpartitions 382 extending radially inward. Thosepartitions 382 cooperate to define sixteen key guides, within any four of whichkeys 380 can slide. Thebutton frame 368 also forms stopsurfaces 384 at the bases of the key guides thus formed. The stop surfaces 384 in the key guides occupied by the four keys at any one time are all arranged at the same level so that they stop all four keys simultaneously. However, different sets of four stops are disposed at different levels so that placing the keys in different sets of the key guides results in different amounts of permitted button travel. - Referring again to
FIGS. 6C and 6E , each of the fourkeys 380 includes apassage 386 therethrough.Outer button member 364 is generally annular but forms four radially extendingtabs 388 from whichrespective legs 390 extend.Legs 390 register withpassages 384 in a sliding arrangement shown inFIG. 6B . - When the user operates
push button 344, he most often presses againstouter button member 364 and thereby depresses that member until itslegs 390 reach the respective key guides' stop surfaces.Outer button member 364 bears against inner button member 366 (moving it to the right inFIG. 6B causing it to deformflexible diaphragm 372 from its illustrated position, to which it is biased). Avalve housing 392 secured to the actuator-chamber housing 374 holds in place a second flexible diaphragm 394, which cooperates withdiaphragm 372 and actuator-chamber housing 374 to form an actuator chamber. The actuator chamber is filled with an incompressible fluid, andbutton member 366's deformation ofdiaphragm 372 forces the fluid through four angularly spacedopenings 396 in a divider wall 398 that the actuator-chamber housing 374 forms. In flowing throughopenings 396, the fluid lifts the lip of an umbrella-type check-valve member 400 snap-ft in a central divider-wall opening. - Referring still to
FIG. 6B , umbrella-type check valve 400 andopenings 396 are designed for fast expulsion and slow return of ejected fluid. The fluid's motion urges diaphragm 394 against the force of abias spring 401 and thereby pushes to the right avalve member 402 slidably disposed in avalve channel 404 formed byvalve housing 392.Valve member 402 forms two annular recesses in which respective O-ring seals ring 408 to extend into a widenedportion 410 ofchannel 404 and thereby break the seal that it had theretofore maintained with the channel wall. Pressure theretofore prevailing intube 350 is thereby relieved throughchannel 404 andoutlet passage 348. When the user depresses only theouter button member 364, the point at which that member'slegs 390 encounter theirrespective lands 384 determines how far into the widenedchannel portion 410valve member 402 extends. - When the user releases button,
flexible diaphragms 372 and 394 tend to resume the rest positions to whichspring 401 biases them, so they act to return thevalve 346 to its closed state. To resume the rest positions, they must move the actuator chamber's fluid back through the dividing wall 398. Butcheck valve 400 prevents fluid from flowing throughopenings 396, and the only route through the wall that remains is therefore ableed orifice 412, which imposes significant flow resistance and therefore a delay between the user's releases of the button andvalve 346's closure. - The duration of the delay depends on the amount of diaphragm deformation that occurred, and this in turn depends on how
far button member 364 traveled. The amount of that travel is determined by the selection of the key guides into which that button member'skeys 380 were placed; different-level stop surfaces 384 result in different amounts of travel oflegs 390 before they encounter those stop surfaces, but the resultant delay is usually at least two seconds. - The delay imposed as a result of the user's depressing only the
outer button member 364 is usually so selected as not to permit the tank to empty completely but still to permit enough flushing flow for most purposes. If the user desires a fuller flush, he instead depresses theinner button member 366's land 376 (FIG. 6C ).Button member 366 can travel farther thanmember 364; it can travel until itskeys 380 reach respective stop surfaces 384. As a consequence, its operation causes more of the incompressible fluid to flow through the divider wall 398, and it thus requires more of the fluid to return upon the button's release before thevalve 346 returns to its closed position. More of the tank's contents therefore flow into the toilet bowl to flush it. -
FIGS. 7A and 7B provide an enlarged view offlusher 300. When the water is level in the tank has fallen significantly below a full-tank level, a freely floating float 415 (FIG. 7A ) permits float valve 413 to open. That valve is mounted in an upper main-housing half 414 supported on the lower main-housing half. The main housing is provided in two halves so that the float-valve assembly 413's height, and thus the level to which the tank is allowed to fill, can be adjusted by means not shown. - A main pressure-
inlet manifold 416, which feeds theconduit 330 by whichpressure chamber 324 is pressurized, forms afurther outlet 418. Through this outlet it feeds aconduit 420 mounted on the uppermain housing half 414 and forming at its lower edge a float-valve seat 422. Formed integrally with theconduit 420 is a generallyannular mouth portion 424 in which a pilot-chamber base 426 is threadedly secured. That base cooperates with theconduit 420'smouth portion 424 to form a float-valve pilot chamber 428 and secure within it a resiliently deformable float-valve diaphragm 430 that tends to seal against the float-valve seat 422. However, a bleed orifice in which is disposed apositioning pin 434 formed by the pilot-chamber base 426 permits fluid from theconduit 420 to enter the pilot-valve chamber 428. When a pilot-valve member 436 is held by the float 415 against the outlet of a pressure-relief passage 438, the pressure in the pilot-valve chamber 428 can build up to equal the pressure in theconduit 420 and, prevailing over a larger area than the pressure from theconduit 420, hold the float-valve diaphragm 430 seated so that it prevents the liquid inconduit 420 from flowing around the float-valve seat 422 through mouth-portion openings 440 and aport 442 to a tank-fill tube 444. - Referring still to
FIG. 7A , when the tank level is low float 415 does not stop pressure-relief passage 438, so pressure in the pilot-valve chamber 428 is relieved faster than it can be restored through thebleed orifice 440. The pressure inconduit 420 therefore unseats the float-valve diaphragm 430, so water fromconduit 420 can flow into thefill tube 444. - Fill
tube 444 is designed for filling the tank, and the tank-filling flow tends to reduce the manifold pressure (i.e. line pressure). Since that pressure is what closes the flush valve, significant tank-filling flow might impair that valve's closing performance. Therefore, there is aflow restrictor 446 so that when the flush-valve member 312 is in its fully unseated position, water cannot flow at any significant rate from thefill tube 444 into the tank. Flow restrictor 446 is mounted on the flush-valve member and protrudes into the fill tube's outlet as to restrict the tube's flow area greatly. This has the beneficial effect of maintaining high pressure in the manifold 416 and thus thepressure line 330 by which, throughbleed orifice 440, the manifold pressure closes the pilot valve and thus imposes on the flush valve the pressure that closes it. In other words, the flow restrictor ensures that there is enough pressure to closeflush valve 304 with significant speed. Whenflush valve 304 does close, it retracts flow restrictor 446 from thefill tube 444 and thereby allows the tank to fill rapidly. - The flow-restrictor operation just described tends to make the flush valve's operation more predictable in duration than it would otherwise be; tank filling does not adversely affect the pressure that operates to close the flush valve. However, the pressure from the water source can vary, and this, too, could result in undesired variations in the delay between the remote valve's closing and that of the flush valve. Referring to
FIG. 6 ,flush valve 304 includes a flow-rate controller 448 interposed in the flow path by which the flush-valve-closing pressure is supplied. The particular type offlow controller 448 is not critical, butFIG. 7B depicts one of the deformable-ring variety. Aflow restrictor 450 disposed in the conduit cooperates with a resilientlydeformable ring 452 to restrict the flow area through which pressurized water must flow to enter the pressure chamber that applies the closing force to the flush valve. If the supply pressure is relatively low, it does not greatly deform the ring, and the resultant flow area is relatively great: the already-low pressure is not reduced much in flowing through the restrictor. If the supply pressure is high, on the other hand, it deforms the ring by a greater amount and thereby restricts the flow area more significantly. So a greater pressure drop from the originally high pressure occurs. The flow-rate controller therefore reduces the pressure variation that the flush valve would otherwise experience. This reduces variation in the speed at which the flush valve closes. - Plumbing installations can experience not only pressure variation but also total pressure loss. In the absence of the present invention, such a pressure loss would permit the flush valve to open, causing an unintended flush. But a check valve 454 is provided in
pressurizer conduit 330 so that the pressure holding the flush valve closed is not lost when the line pressure is. -
FIG. 8 illustrates another embodiment of a remote actuator used withflusher 300. Remote actuator 500 includes avalve 510, which controls flow from itsinlet 511 to itsoutlet 512. The user depresses a push button 513 to openvalve 510. The user typically will not keep the button depressed long enough for the required flush volume to flow. But thevalve 510 nonetheless remains open long enough, as will now be explained. - In the illustrated embodiment, push button 513 actually is a compound button consisting of outer and
inner button members operator housing 518 that includes anouter housing member 520 and aninner housing member 522 threadedly secured to it. Theouter housing member 520 forms aflange 524 that cooperates with anend cap 526 to secure the valve assembly to some support such as a toilet-tank wall. Anactuator frame 528 is threadedly secured to the inner operator-housing member 522 and cooperates with it to clamp aflexible diaphragm 530 into position.Flexible diaphragm 530 urges theinner button member 516 upward inFIG. 8 , but aknee 532 that the outer operator-housing member 520 forms so engages ashoulder 534 formed by theouter button member 514 as to retain theinner button member 522 within the housing. - A
nut 535 that threadedly engages theactuator housing 528 secures avalve housing 536 to theactuator housing 528 and thereby clamps into a fixed position anannular lip 538 formed at the end of a secondflexible diaphragm 540. Together with theactuator housing 528, the first and secondflexible diaphragms second chamber segments 542 and 544 separated by adivider wall 546 that theactuator housing 528 forms. - The inner and
outer button members outer button member 514 is depressed, it in turn presses down on the inner member's plate portion 547, and this causes the firstflexible diaphragm 530 to deform in such a manner as to reduce the volume of thefirst chamber segment 542. But the actuation chamber thatsegments 542 and 544 form is filled with an incompressible fluid such as distilled water, and a reduction in thefirst chamber segment 542's volume causes the second segment 544's volume to increase. Specifically, the incompressible fluid flows from thefirst chamber segment 542, throughopenings 548, past the lips of a flexible check-valve member 550, and into the second chamber segment 544. As a result, the secondflexible diaphragm 540 deforms downward: the second chamber segment grows in volume. - This deformation of the second
flexible diaphragm 540 occurs against the force of acompression spring 552, which is disposed within aspring chamber 554 that the secondflexible diaphragm 540 cooperates with thevalve housing 536 to form. That spring bears against anactuator head 556 that in turn bears against the secondflexible diaphragm 540 to bias it into the illustrated position. In that position, an O-ring 557 mounted on the actuator'sshaft 58, which is disposed within aguide 560 that thevalve housing 536 forms, keeps water in theinlet 511 from flowing to theoutlet 512. A second O-ring 562 prevents inlet water from flowing into thespring chamber 554. The just-explained downward deformation of the secondflexible diaphragm 540 in response to a user's pressing the push button moves the lower O-ring 557 into an expandedregion 564 and thus breaks its seal. This permits flow from thevalve inlet 511 to thevalve outlet 512. - When the user releases the push button,
spring 552 causes the secondflexible diaphragm 540 to return to the illustrated rest state. For that return to occur, the incompressible fluid has to flow back from the second chamber segment 544 to thefirst chamber segment 542. Check-valve member 550 prevents that return flow from occurring through the low-flow-resistance path that the relatively large divider-wall openings 548 provide. Instead, the returning fluid must all flow through a small divider-wall bleed orifice 572, so the return flow is slow, requiring at least two seconds before theactuator shaft 58 can reach a position in which the lower O-ring re-seals against theguide 560's wall and again prevents main valve flow. - Of course, the actual closure delay depends on the orifice size, the incompressible fluid's viscosity, and the actuation-chamber size. But it additionally depends upon the degree of deformation from which the flexible diaphragms need to recover, and this in turn depends on the length of button travel. When the user pushes the outer button, outer-
button legs 574 move downward through plate-portion holes 575 until they meet a stop surface provided by anannular stop member 576. The distance fromlegs 574's rest position to the position of thestop member 576 thus determines the button travel when the user pushes the outer button member. If the user instead pushes only on the inner button member, though, that button member can travel a little farther, since it does not stop until the inner button member's plate portion 547 encounters stopmember 576. This feature of enabling the user to choose between closure delays is of particular utility when the valve controls toilet flushing; pressing the outer button results in a normal flush, while pressing only on the inner button results in a fuller flush. In both cases, it is thestop member 576's position that determines the button travel and thus the closure delay. -
Stop member 576's position depends in turn on the valve's inlet pressure, as will now be explained. The inner operator-housing member 522 and thestop member 576 cooperate with atension spring 580, which is secured to them, to form a resiliently expandable stop. The stop defines aninternal stop chamber 582, which O-rings check valve 585 allows fluid to flow from apressurizer conduit 586 intochamber 582 from apressurizer port 587. That port communicates with theinlet 511 by way of the clearance between theactuator shaft 58 and theactuator guide 560's wall. Pressure at thevalve inlet 511 thus can pressurize thestop chamber 582. Thetension spring 560 tends to urge thestop member 576 toward the inner operator-housing member's lower end and thereby reduce the stop chamber's size. But the force that the inlet pressure exerts on thestop member 576 acts against the spring force and thus tends to expand the expandable stop. - The degree of stop expansion depends on the inlet pressure: the greater that pressure is, the more the actuator stop expands. Greater stop expansion results in the button travel's being more limited and thereby in less delay before the main valve closes. This shorter closure delay tends to compensate for the greater main-valve flow rate that a higher pressure causes. That is, it reduces pressure-caused variations in the volume of liquid that a single push-button operation allows to pass through the main valve.
- Now, the outlet pressure typically undergoes a sudden reduction when the user operates the valve and thus permits flow from the
valve inlet 511 through thevalve outlet 512. But thepressurizer check valve 585, which readily permits fluid flow from thevalve outlet 512 through thepressurizer conduit 585 to thestop chamber 582 to pressurize it, retards flow throughconduit 586 in the other direction. It thereby tends to keep the stop expanded to the size that the inlet pressure dictated before the valve was opened. So the stop remains expanded throughout the duration of a closure delay, i.e., throughout the time when the valve is open. The stop chamber pressure will nonetheless adjust to inlet-chamber pressure reductions that occur while the valve is closed, because ableed slot 588 formed in the valve member 590's seat permits depressurization over a longer time scale. Other embodiments may instead provide a bleed passage 591 through the valve member rather than around it. - Although, for the sake of simplicity,
FIG. 8 depicts thestop member 576 as providing a single-level stop surface, it may be advantageous to have it provide several levels of stop surface so that a choice of closure-delay range can be made while the valve is being assembled or installed. A stop member such asFIG. 8A 'sstop member 576 may be employed for this purpose. That stop member is provided with a generallycylindrical extension 594, from whichpartitions 596 extend radially inward to formkey ways 598.FIG. 8B , which is a stop view of the valve assembly with itsend plate 526 and outer operator-housing member 520 removed, show that the outer button in such an embodiment formskeys 602 that fit into four key ways spaced by equal angles from each other. AsFIG. 8C shows, the inner button similarly formskeys 604 that fit into those key ways. -
FIG. 8A shows that the different key ways have different-height stop surfaces 600. The heights repeat so that each key in any set of four key ways spaced by 90° from each other, such as the set thatkeys 604 ofFIG. 8C occupy, have the same height. When the button is assembled, the assembler chooses the closure-delay range by selecting the 1st of four key ways into which he inserts the outer-button and inner-button keys - Having described various embodiments and implementations of the present invention, it should be apparent to those skilled in the relevant art that the foregoing is illustrative only and not limiting, having been presented by way of example only. There are other embodiments or elements suitable for the above-described embodiments, described in the above-listed publications, all of which are incorporated by reference as if fully reproduced herein. The functions of any one element may be carried out in various ways in alternative embodiments. Also, the functions of several elements may, in alternative embodiments, be carried out by fewer, or a single, element.
Claims (27)
1-7. (canceled)
8. A tank-type flusher, comprising:
an intake valve constructed to close water flow from an external water source to a water storage tank when there is a predefined water level in said water tank, said intake valve including a float constructed and arranged to float depending on a water level in said water storage tank;
a diaphragm-operated flush valve including a flush-valve chamber, said diaphragm-operated flush valve being constructed to open upon actuation to discharge water into a toilet bowl from said water tank; and
a wiper seal co-operatively arranged with said flush valve to seal water inside said water tank and prevent water leaking into said toilet bowl in the closed state.
9. A tank-type flusher, comprising:
an intake valve connected to an external water source and constructed to close water flow to a water storage tank at about a predefined water level in said water tank; and
a flush valve constructed to control position of a flush valve member movable between a seated state and an unseated state allowing water discharge from said water tank into a toilet bowl; said flush valve member including a wiper seal co-operatively arranged with said flush valve to seal water inside said water tank and prevent water leaking into said toilet bowl while being forced to said seated state by at least a portion of water pressure from said external source.
10. The tank-type flusher of claim 9 wherein said intake valve and said flush valve are located within a single housing.
11. The tank-type flusher of claim 9 wherein said flush-valve member is arranged to receive a water pressure from said external source and is arranged to prevent said water discharge utilizing at least a portion of said water pressure.
12. The tank-type flusher of claim 9 wherein said flush valve member includes a diaphragm-operated flush valve that is controlled by a solenoid.
13. The tank-type flusher of claim 9 wherein said water tank is an exposed water tank.
14. The tank-type flusher of claim 9 wherein said water tank is a concealed water tank located behind a wall.
15. The tank-type flusher of claim 9 wherein said intake valve enables a variable water level in said tank.
16. The tank-type flusher of claim 9 including a vacuum breaker arranged to prevent transfer of water from said tank to a water supply.
17. The tank-type flusher of claim 9 including a manual actuator constructed and arranged to actuate said flush valve.
18. The tank-type flusher of claim 17 wherein said manual actuator is a push button actuator.
19. The tank-type flusher of claim 18 wherein said push button actuator is constructed to actuate said flush valve enabling a dual water volume flush.
20. The tank-type flusher of claim 18 wherein said push button actuator is constructed to actuate hydraulically said flush valve.
21. The tank-type flusher of claim 8 including an automatic actuator constructed and arranged to actuate said flush valve.
22. The tank-type flusher of claim 21 wherein said automatic actuator is constructed to be triggered by a sensor.
23. The tank-type flusher of claim 22 wherein said sensor registers presence of an object.
24. The tank-type flusher of claim 22 wherein said sensor registers movement of an object.
25. The tank-type flusher of claim 22 wherein said sensor is an optical sensor.
26. The tank-type flusher of claim 21 wherein said automatic actuator is constructed to actuate said flush valve enabling a dual water volume flush.
27. The tank-type flusher of claim 21 wherein said automatic actuator is located outside of said water tank and is constructed to actuate hydraulically said flush valve.
28. The tank-type flusher of claim 9 including a check valve arranged to reduce variation of closing pressure depending on water line pressure.
29. The tank-type flusher of claim 9 including a pressure compensated flow regulator.
30. The tank-type flusher of claim 9 including a viper seal co-operatively arranged with said flush valve to prevent water leaking into said toilet bowl.
31. The tank-type flusher of claim 9 including a vent for controlling odor.
32-60. (canceled)
61. A flusher comprising:
a tank forming a flush outlet by which liquid in the tank may leave the tank for flushing;
a flush-valve member operable between an unseated state, in which it permits flow from the tank through the flush outlet, and a seated state, in which it prevents flow from the tank therethrough; and
a valve-operating mechanism including a housing that defines a control chamber disposed at a local location and forms a line-pressure inlet that admits water line pressure into the control chamber and further forms a control-chamber pressure-relief outlet, by which pressure in the control chamber can be relieved, the valve-operating mechanism operating the flush-valve member to one of said seated and unseated states thereof when the line pressure prevails in the control chamber and operating the flush-valve member to the other of said seated and unseated states thereof when the pressure in the control chamber is relieved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/215,804 US20060101566A1 (en) | 2000-11-20 | 2005-08-29 | Toilet flusher with novel valves and controls |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/716,870 US6321395B1 (en) | 2000-11-20 | 2000-11-20 | Timed fluid-linked flush controller |
US09/761,533 US6370707B1 (en) | 2001-01-16 | 2001-01-16 | Supply-line-sealed flush controller |
US09/761,408 US6453479B1 (en) | 2001-01-16 | 2001-01-16 | Flusher having consistent flush-valve-closure pressure |
PCT/US2001/011384 WO2001077553A2 (en) | 2000-04-07 | 2001-04-06 | Flush valve |
US09/957,761 US6425145B1 (en) | 2001-09-21 | 2001-09-21 | Push button for metered flow |
PCT/US2001/043273 WO2002042670A2 (en) | 2000-11-20 | 2001-11-20 | Toilet flusher valve |
US10/441,151 US6934976B2 (en) | 2000-11-20 | 2003-05-19 | Toilet flusher with novel valves and controls |
US11/215,804 US20060101566A1 (en) | 2000-11-20 | 2005-08-29 | Toilet flusher with novel valves and controls |
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Application Number | Title | Priority Date | Filing Date |
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US10/441,151 Continuation US6934976B2 (en) | 2000-11-20 | 2003-05-19 | Toilet flusher with novel valves and controls |
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US20060101566A1 true US20060101566A1 (en) | 2006-05-18 |
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US10/441,151 Expired - Lifetime US6934976B2 (en) | 2000-11-20 | 2003-05-19 | Toilet flusher with novel valves and controls |
US11/215,804 Abandoned US20060101566A1 (en) | 2000-11-20 | 2005-08-29 | Toilet flusher with novel valves and controls |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US10/441,151 Expired - Lifetime US6934976B2 (en) | 2000-11-20 | 2003-05-19 | Toilet flusher with novel valves and controls |
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US (2) | US6934976B2 (en) |
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Cited By (11)
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WO2007141627A2 (en) | 2006-06-08 | 2007-12-13 | Shanghai Kohler Electronics, Ltd | Water box toilet sensing flushing system |
EP2029820A2 (en) * | 2006-06-08 | 2009-03-04 | Shanghai Kohler Electronics, Ltd. | Water box toilet sensing flushing system |
US20100044601A1 (en) * | 2006-06-08 | 2010-02-25 | Weigen Chen | Water box toilet sensing flushing system |
EP2029820A4 (en) * | 2006-06-08 | 2011-12-28 | Shanghai Kohler Electronics | Water box toilet sensing flushing system |
US8104741B2 (en) | 2006-06-08 | 2012-01-31 | Shanghai Kohler Electronics, Ltd. | Water box toilet sensing flushing system |
WO2008092144A2 (en) * | 2007-01-26 | 2008-07-31 | Clem Abrams | Hydraulicly lifted toilet seat |
WO2008092144A3 (en) * | 2007-01-26 | 2008-11-20 | Clem Abrams | Hydraulicly lifted toilet seat |
CN102251567A (en) * | 2011-01-20 | 2011-11-23 | 薛华 | Pressure water pumping type water-saving toilet bowl |
US10927537B2 (en) | 2016-01-25 | 2021-02-23 | Kohler Co. | Line pressure-driven, tankless, siphonic toilet |
US11299877B2 (en) | 2019-02-28 | 2022-04-12 | Kohler Co. | Fluid connector for toilet |
US11639599B2 (en) | 2019-02-28 | 2023-05-02 | Kohler Co. | Fluid connector for toilet |
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US20040025238A1 (en) | 2004-02-12 |
US6934976B2 (en) | 2005-08-30 |
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