|Número de publicación||US20060153707 A1|
|Tipo de publicación||Solicitud|
|Número de solicitud||US 11/034,600|
|Fecha de publicación||13 Jul 2006|
|Fecha de presentación||13 Ene 2005|
|Fecha de prioridad||13 Ene 2005|
|También publicado como||CN101258326A, EP1836396A2, WO2006076297A2, WO2006076297A3|
|Número de publicación||034600, 11034600, US 2006/0153707 A1, US 2006/153707 A1, US 20060153707 A1, US 20060153707A1, US 2006153707 A1, US 2006153707A1, US-A1-20060153707, US-A1-2006153707, US2006/0153707A1, US2006/153707A1, US20060153707 A1, US20060153707A1, US2006153707 A1, US2006153707A1|
|Inventores||Steven Sweeton, Linn Wanbaugh, David DeJong|
|Cesionario original||Sweeton Steven L, Wanbaugh Linn D, Dejong David L|
|Exportar cita||BiBTeX, EndNote, RefMan|
|Citada por (2), Clasificaciones (4), Eventos legales (1)|
|Enlaces externos: USPTO, Cesión de USPTO, Espacenet|
1. Field of the Invention
This invention relates broadly to battery operated fluid pumps. More particularly, this invention relates to a battery operated fluid pump contained in a spray head which fits onto existing pump spray containers and which exhibits substantially continuous spray.
2. State of the Art
Many household and industrial products are sold in containers that include a sprayer. These products include cleansers, insecticides, polishes, waxes, etc. There are several kinds of sprayers used with these products. Perhaps the most common is the manual push button or trigger operated pump which is seen most frequently on liquid cleansers. It has the advantage of being environmentally friendly (i.e. it does not require a propellant) but the disadvantage of delivering fluid in a series of pulses rather than in a continuous spray. Another well known sprayer is the aerosol can which is sealed and charged with a gas propellant. This sprayer has the advantage that it dispenses fluid in a continuous spray, but has several disadvantages. One disadvantage is that the can cannot be refilled. Another disadvantage is that depending on the gas used to charge the container, the propellant can be environmentally unfriendly. While environmentally friendly propellants do exist, generally, they do not charge as well as the unfriendly gases. Still another popular sprayer is the air pump sprayer seen most frequently with insecticides and liquid garden products. The pump sprayer includes a hand operated air pump which is used to charge the container with compressed air. After it is charged, it operates much like an aerosol can. The pump sprayer is environmentally friendly but requires considerable effort to keep charged because air is not as efficient a propellant as environmentally unfriendly gases such as FREON or hydrocarbon gasses.
In recent years there has been some experimentation with battery powered pump sprayers. Most of these devices include a spray mechanism which is similar to the ubiquitous push button (or trigger) pump sprayer but which is coupled to a battery powered electric motor by some type of linkage which converts the rotary action of the motor into an oscillatory motion to drive the pump piston. Many of these battery operated pump sprayers are designed to work only with a specially constructed bottle, i.e. they are not retrofittable to existing pump spray bottles. Many also have weight distribution problems, i.e. they are top heavy and cause the bottle to which they are attached to tip over. Many of these battery powered pumps have large priming volumes, thus causing a delay between the time the pump is activated and the time liquid begins to be dispensed. Significantly, these pumps do not really provide a constant spray. They provide a continuous pulsed spray like that obtained by repeatedly squeezing the trigger of pushing the button on a hand operated spray pump.
It is therefore an object of the invention to provide a battery operated spray pump.
It is another object of the invention to provide a battery operated spray pump that is retrofittable to an existing spray bottle.
It is an additional object of the invention to provide a battery operated spray pump which produces a substantially continuous spray rather than a pulsed spray.
In accord with these objects, which will be discussed in detail below, a battery operated spray pump according to the invention includes a piston pump having a double wave cam which is pushed by a pair of rotating cam pushers coupled to the electric motor via a gear transmission. The double wave cam has an unequal duty cycle, i.e. it uses more time to expel fluid from the piston cylinder than it uses in filling the cylinder. The cam pushers rotate at a speed which, in conjunction with the duty cycle of the cam, produces a low pressure relatively constant stream. According to the presently preferred embodiment, the duty cycle of the cam is approximately 270° and the speed of the cam pushers is approximately three rotations per second.
Additional objects and advantages of the invention will become apparent to those skilled in the art upon reference to the detailed description taken in conjunction with the provided figures.
Turning now to
The motor 24 is coupled to the front mounting bracket 40 with its-drive shaft 24a extending rearward (see
Turning now to
The cammed end of the double wave cam 56 is designed to interact with the pusher drive gear 50 which is illustrated in detail in
Turning now to
The piston components include a spring 62, a piston 64, a piston rod 66, and a retainer cap 68. The spring 62 is inserted into the rear opening 60 a of the valve body 60 and abuts an interior annulus (not shown). The piston 64 is inserted into the valve body 60 behind the spring which biases the piston backwards. The piston rod 66 is inserted behind the piston 64 and the retainer cap 68 is attached by force fitting to the valve body 60. The retainer cap 68 has a central opening through which the piston rod 66 extends. The piston, piston rod, and the interior of the valve body wherein the piston moves are preferably coated with a silicone lubricant (not shown).
The inlet ball valve components include a ball cage 70 having interior vanes (not shown), a valve ball 72, a retainer tube 74, a tube connector 76, and an inlet elbow 78. The retainer tube 74, adapter tube 76, and inlet elbow 78 are coupled to each other by epoxy and the retainer tube 74 is force fit into the bottom opening 60 b of the valve body 60 capturing the ball 72 and the ball cage 70. It will be appreciated however that some or all of the retainer tube 74, adapter tube 76, and inlet elbow 78 may be integrally formed.
The spray nozzle components include a discharge valve 80, a volume reducer 82, spin mechanics 84, and an adjustable nozzle 16. The discharge valve is a circular flapper valve having a post 80 a which extends forward into the volume reducer 82. The volume reducer occupies a cylindrical space having a diameter smaller than the diameter of the valve 80. The volume reducer 82 has a forwardly extending post 82 a upon which the spin mechanics 84 is mounted. All of those components are inserted into the forward end 60 c of the valve body 60 and the nozzle 16 is snap fit over the forward end of the valve body 60 where it retains the other components but is free to rotate.
Referring back to
From the foregoing, those skilled in the art will appreciate that rotation of the motor drive shaft 24 a causes rotation of the pinion gear 44 which rotates the reduction gear 48 at a slower rate. The reduction gear 48 causes rotation of the drive gear 50. As the drive gear 50 rotates, the pusher surfaces 50 c, 50 d engage the cam surfaces 56 c, 56 d and cause the double wave cam 56 to reciprocate back and forth against the piston rod 66. This causes the piston 64 to move back and forth in the valve body 60. When the piston moves backwards, the ball 72 is lifted by negative pressure in the valve body 60, allowing liquid to enter the valve body from the container 1 (
According to the presently preferred embodiment, the forward moving duty cycle (the spray duty cycle) of the piston and the rearward moving duty cycle (the fill duty cycle) of the piston are unequal. In particular, this allows the piston to move more quickly during the fill duty cycle than during the spray duty cycle. In other words, the piston spends more time expelling fluid through the nozzle than it spends drawing fluid from the container into the valve body. This helps overcome the “pulsing” nature of certain prior art pumps and results in what appears to be a more continuous spray. According to the presently preferred cam arrangement, a 270° spray duty cycle and a 90° fill duty cycle is utilized. This arrangement is illustrated schematically in
Further, according to the presently preferred embodiment, the transmission 26 is arranged so that the piston 64 cycles between two and ten cycles per second, and most preferably between 2.5 and 4 times per second. This, together with the spray duty cycle discussed above, results in an apparently constant stream at a relatively low pressure (5-200 psi).
The spray head of the invention is well balanced, small, and is retrofittable to many existing fluid containers taking the place of a manual spray pump.
There have been described and illustrated herein several embodiments of a battery operated spray head retrofittable to existing pump spray containers. While particular embodiments of the invention have been described, it is not intended that the invention be limited thereto, as it is intended that the invention be as broad in scope as the art will allow and that the specification be read likewise. It will therefore be appreciated by those skilled in the art that yet other modifications could be made to the provided invention without deviating from its spirit and scope as claimed.
|Patente citante||Fecha de presentación||Fecha de publicación||Solicitante||Título|
|US8596555||22 Oct 2009||3 Dic 2013||Graco Minnesota Inc.||Portable airless sprayer|
|WO2006101730A2 *||8 Mar 2006||28 Sep 2006||Saint Gobain Calmar Inc||Compact battery operated spray head fittable onto existing pump spray containers and providing improved balance|
|Clasificación de EE.UU.||417/411|
|11 Abr 2005||AS||Assignment|
Owner name: ST. GOBALN-CALMAR, INC., MISSOURI
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SWEETON, STEVEN L.;WANBAUGH, LINN D.;DEJONG, DAVID L.;REEL/FRAME:016051/0768;SIGNING DATES FROM 20050111 TO 20050112