WO2000050810A1 - Switch cover plate providing automatic emergency lighting - Google Patents
Switch cover plate providing automatic emergency lighting Download PDFInfo
- Publication number
- WO2000050810A1 WO2000050810A1 PCT/US1999/004363 US9904363W WO0050810A1 WO 2000050810 A1 WO2000050810 A1 WO 2000050810A1 US 9904363 W US9904363 W US 9904363W WO 0050810 A1 WO0050810 A1 WO 0050810A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrostatic field
- illumination
- wall plate
- electrical circuit
- electrical
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/02—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which an auxiliary distribution system and its associated lamps are brought into service
Definitions
- This invention relates generally to emergency lighting devices such as standby automatic lamps, and more particularly to such an emergency lighting device assembled into a common switch cover plate and providing an illumination source and a sensor for determining when AC power has been lost to the electrical switch covered by the plate.
- Nicholl et al. U. S. 4,177,500 describes a power failure light for monitoring a power line and for illumination upon the interruption of power.
- This invention includes a light bulb, a rechargeable battery, a power supply providing charging current for the battery, a pair of diodes connecting the battery across the power supply, a pair of cascaded transistors connecting the bulb across the battery with base-emitter junctions
- Jester, U. S. 4,514,789 describes a light switch plate having a rearwardly opening housing for removably holding an AA battery.
- This invention is detachably mountable over a conventional wall mounted 110 volt AC light switch.
- An LED mounted on the front of the housing is connected to the battery through an integrated circuit oscillator, which flashes the LED.
- McCue et al. U. S. 4,631,649 describes an emergency light fixture that is permanently mountable in a conventional power outlet box having, in fixed relation, a threaded bore for accommodating a screw for a face plate and slots for accommodating an electric plug.
- the emergency light fixture includes a housing, an electric plug extending from the rear wall of the housing, a battery, a battery charger, and a lamp mounted in the housing and wired to provide illumination during a power outage.
- U. S. 4,977,351 describes an emergency lighting system which permits at least one gas discharge lamp to be operated from an AC power source when AC current is present and form a battery when AC signal is not present.
- the circuit also provides the capability for turning the lamp on under other selected emergency conditions such as in response to an intruder detection, or in response to detection of smoke, heat, water, or some other emergency.
- Walters et al., U. S. 5,132,596 describes an outdoor lighting control that includes a photosensor responsive to ambient outdoor light and an alternating current relay with a pair of contacts movable between make and break positions.
- the relay includes a contact actuating arrangement that responds to the photosensor and alternating current bias the contact into a make position and move the contacts electromagnetically into a break position.
- the contact actuating arrangement is sufficiently stiff and responsive to the alternating current to limit chatter in the contact during passage from make to break to fifteen milliseconds when the photosensor senses a transition between dark and daylight.
- the chatter is limited between 1 and 10 mill-seconds.
- Li, U. S. 5,336,977 describes an emergency lighting device that includes a hollow casing, a magnetic field detecting unit, a lamp unit and a driving unit.
- the casing is positioned adjacent to an electric outlet.
- the magnetic field detecting unit is disposed inside the casing and detects the absence of a magnetic field from the electric outlet.
- the lamp unit is mounted operatively on the casing.
- the driving unit is disposed inside the casing and is connected electrically to the lamp unit and to the detecting unit.
- the driving unit includes a light-sensitive switch unit and is responsive to the detecting unit so as to activated the lamp unit only when the magnetic field from the electric outlet is absent and there is weak surrounding light.
- Blackman, U. S. 5,473,517 describes a housing for an emergency light source, which is electrically connectable to a conventional light switch.
- the housing replaces a conventional switch plate and has at least one opening for receiving the switch plate and has at least one opening for receiving the switch actuator of the light switch.
- the replacement housing includes wires for electrical connection to the light switch and is divided into upper and lower housing section, wherein the upper section includes a battery compartment, a printed circuit board compartment, and an opening to receive the switch actuator.
- the lower housing section includes a compartment for receiving a compact fluorescent lamp, reflectors, and a dif ⁇ user cover.
- the prior art teaches a variety of safety and emergency lighting devices.
- Blackman teaches a replacement switchplate with wired connection to a light switch.
- This switch plate contains a lighting means.
- Walters teaches a lighting control having photosensor responsive means.
- Jester teaches a lighted switch plate.
- Li teaches a magnetic field sensor responsive to an absence of power at a nearby AC outlet, such a sensor being unable to operate in conjunction with a switch since without current flow a magnetic field is not produced.
- the prior art does not teach a switch plate of compact size and proportions having field sensing capability so as to avoid the necessity of hard wiring and which provides an exit marker and illumination.
- the present invention fulfills these needs and provides further related advantages as described in the following summary.
- the present invention teaches certain benefits in construction and use which give rise to the objectives described below.
- the present invention provides a wall mounted plate which includes an electrical circuit capable of sensing the electrostatic field associated with an electrical circuit within, or behind the wall.
- the electrical circuit uses an antenna for sensing the loss of field energy and then enables a lighting circuit in order to provide emergency exit lighting.
- a primary objective of the present invention is to provide a proximity circuit capable of providing emergency lighting when a power failure occurs, such circuit having advantages not taught by the prior art.
- Another objective is provide such a circuit within a switch plate that is mounted over a switch box by the typical screw-on method used for common switch plates.
- a further objective is to provide such a circuit which has the advantage of being operated over long periods of time by a small battery source and therefore does not require the use of household current.
- a still further objective is to provide such a switch plate embodied in a relatively flat and compact size so as to give the appearance of an ordinary switch plate, yet which provides the advantages of emergency lighting and automatic functioning upon power failure.
- a still further objective is to provide such a wall plate embodied in a relatively flat and compact size so as to give the appearance of an ordinary AC outlet cover, yet which provides the advantages of emergency lighting and automatic functioning upon power failure.
- a still further objective is to provide such a wall plate embodied in a relatively flat and compact size so as to give the appearance of an ordinary wall cover plate, yet which provides the advantages of emergency lighting and automatic functioning upon power failure.
- FIGURE 1 is a front elevational view of a first embodiment of the present invention, a wall switch cover plate;
- FIGURE 2 is a sectional side elevational view thereof taken along cutting line 2-2 in Fig. 1 and showing a switch box and wall switch;
- FIGURE 3 is a block diagram of an electrical circuit of the invention.
- FIGURE 4 is a perspective view of the embodiment of Fig. 1;
- FIGURE 5 is a perspective view of a second embodiment of the invention, a power outlet cover plate.
- FIG. 1 A first embodiment of the invention, an emergency lighting device for covering a wall switch electrical box 10, which is mounted in or behind a wall 20 is illustrated in Figs. 1- 4.
- the electrical box 10 contains an electrical wall switch 30 having a switch arm 32 extending outwardly from the wall 20 so as to be manually adjusted for turning room lights on and off.
- the invention includes a switch plate 40, one version of which is illustrated in Figs. 1 , 2 and 4, for covering the wall switch electrical box 10, the switch plate providing an electrical circuit mounting surface 42, a switch plate mounting means 44, typically a pair of spaced apart holes, and a switch arm engaging means 46, typically a rectangular hole.
- the switch plate 40 provides a central portion 40A including the switch plate mounting means 44 and the switch arm engaging means 46.
- the central portion 40 A is preferably planar, so as to lie in contact with the wall surface.
- the switch plate 40 further includes a peripheral portion 40B providing an enclosure means 40C for enclosing an electrical circuit 50.
- the enclosure means 40C provides a space for containing the components of the electrical circuit 50.
- the central portion 40 A cooperates with the wall switch 30, and the peripheral portion 40B cooperates with the central portion and the surrounding wall to enclose the electrical circuit 50.
- This is considered a key inventive aspect of the present invention in that the device, as a whole takes on the appearance of a simple, common wall switch cover, and provides, a close-to-the wall portion (40 A) for engaging the switch arm 32 (also commonly refered to as a "bat” or “toggle"), and a peripheral enclosure portion (40B) providing a means for circuit housing within the electrostatic filed of the wall switch, or as described below, any other electrostatic field generating electrical device.
- the electrical circuit 50 is illustrated in Fig. 3.
- an antenna 80 is exposed to the local electrostatic field produced by the building AC wiring or other electrostatic field generating means such as the wall switch 30.
- the combination of electrostatic field strength, the coupling capacitance created by the antenna 80, the ground return, and the input impedance of an amplifier 82 all determine the level of signal voltage developed by the antenna 80.
- U.L. safety requirements demand that two large value safety resistors 84 be inserted in series with the antenna 80 to limit current flow should an electrical short occur between the antenna 80 and the building AC power wiring. Since, in the present invention there is no way for these two elements to come into contact, this occurance would be unlikely.
- the amplifier 80 boosts the detected signal voltage for driving a peak detector circuit 86 and a steering logic circuit 88 as shown in Fig. 3.
- the peak detector circuit 86 produces a DC voltage which is proportional to the amplified antenna voltage once it exceeds a first threshold. Beyond a second threshold the peak detector circuit 86 saturates, providing no additional DC voltage boost although the AC field strength may increase further. Rapid charge and slow discharge characteristics are appropriately selected to avoid both false triggering of a bank of LED's 90 and any unnecessary delay in operation.
- the steering logic circuit 88 accepts inputs from both the peak detector circuit 86 and a test/reset means 87, described herein also as a button. Both inputs are condtioned in the steering logic circuit 88 by schmiddt triggers to produce clean logic transitions.
- the steering logic circuit 88 makes decisions about whether the LED's 90 will be on or off depending on the following conditions, where it is understood that AC power is considered equivalent to the presence of the above described electrostatic field and loss of AC power is equivalent to the loss of the electrostatic field:
- An LED driver circuit 89 senses the logic level produced by the steering logic circuit 88 and provides suffient current to drive the LED's 90 when it is commanded to do so.
- the LED's 90 are preferably super high flux types which can provide adequate lighting in a small room during AC power emergency conditions to facilitate personnel orientation.
- the test/reset means 87 and the steering logic circuit 88 is adapted for automatically placing the invention in an active state following a loss of the electrostatic field of the electrostatic field generating means (wall switch, etc.) and a manual shutdown of the illumination means 56, such that a subsequent return of the electrostatic field and a subsequent second loss of the electrostatic field provides a further ignition of the illumination means 56 without human intervention.
- a low battery test circuit 92 senses when the battery 58 is discharged below a level that is necessary for providing sustained emergency lighting. It then flashes one of the LED's 90A with a repeated low duty cycle pulse to provide a visual warning.
- the low battery test circuit 92 is designed to test the battery 58 while minimizing battery current drain during the test.
- a pulse generator circuit 94 operates at a very low duty cycle providing battery power to a comparator circuit 96. Both the comparator circuit 96 and a voltage reference circuit 98 are momentarily turned on during each cycle of the pulse generator circuit 94. A sample of the battery voltage is compared to the voltage reference of the voltage reference circuit 98. The comparator circuit 96 then momentarily fires the LED driver 89B if the sampled battery voltage is too low.
- the switch plate 40 further provides an illumination means viewing means 48.
- the illumination means viewing means 48 may include at least one aperture 48A in the switch plate 40, the aperture(s) 48 A being positioned and engaged with the illumination means 56 for direct viewing of the illumination means 56. Therefore, as shown in Fig. 1, aperture 48A is one or more rectangular holes in switch plate 40 through which elements of illumination means 56 may protrude or be visible.
- the illumination means viewing means 48 may include at least one light transmissive portion 48B on the switch plate 40, where, the at least one light transmissive portion 48B is positioned and engaged with at least one element of the illumination means 56 for indirect viewing of the illumination means 56, i.e., by viewing the light from the illumination means 56 without viewing the illumination means 56 itself.
- Such an alternate viewing means 48B may be a clear or a colored portion of switch plate 40 which, as shown in Fig. 1 may lay over an illumination element part of illumination means 56.
- the electrical apparatus covered by the switch plate is an electical outlet means such as a duplex socket of the type well known in most households (not shown).
- a device has an electrical socket means accessable to the invention.
- the electrical box engaging means is an electrical plug means 70, such as the dual plugs shown in the figure, for engaging the electrical socket means of the electrical apparatus. Therefore in this embodiment, the invention is mounted over a wall outlet box and is in close proximity thereto. Further the invention, in this embodiment provides a duplex socket 72 for accepting plugs that would otherwise be inserted into the socket of the electrical outlet means.
- This embodiment shows that the present invention may be used with an electical socket outlet as well as a wall switch for the same intended purpose.
- the present invention may be applied to other applications beside wall switches and AC outlets. Any situation wherein an AC voltage change is occuring, with, or without current flow, within a few centimeters of the surface of a wall is appropriate for the mounting of the present invention onto the exterior wall surface in order to indicate that the AC voltage is no longer present and to provide emergency illumination.
- One important application is in the interior of elevators in order to provide emergency lighting in case of a power failure.
- the enclosure means 40 may be a smooth plate with mounting means.
- Such mounting means may be an adhesive backing or a magnet or other well known possibilities.
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MXPA00011349A MXPA00011349A (en) | 1999-02-26 | 1999-02-26 | Switch cover plate providing automatic emergency lighting. |
AU28827/99A AU761811B2 (en) | 1999-02-26 | 1999-02-26 | Switch cover plate providing automatic emergency lighting |
JP2000601367A JP2002538579A (en) | 1999-02-26 | 1999-02-26 | Switch cover plate that provides automatic emergency lighting |
CA002329042A CA2329042A1 (en) | 1999-02-26 | 1999-02-26 | Switch cover plate providing automatic emergency lighting |
PCT/US1999/004363 WO2000050810A1 (en) | 1999-02-26 | 1999-02-26 | Switch cover plate providing automatic emergency lighting |
NZ508094A NZ508094A (en) | 1999-02-26 | 1999-02-26 | Switch cover plate providing automatic emergency lighting |
EP99909673A EP1155259A4 (en) | 1999-02-26 | 1999-02-26 | Switch cover plate providing automatic emergency lighting |
KR1020007011888A KR20010106107A (en) | 1999-02-26 | 1999-02-26 | Switch cover plate providing automatic emergency lighting |
CN99807189A CN1305574A (en) | 1999-02-26 | 1999-02-26 | Switch cover plate providing automatic emergency lighting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1999/004363 WO2000050810A1 (en) | 1999-02-26 | 1999-02-26 | Switch cover plate providing automatic emergency lighting |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000050810A1 true WO2000050810A1 (en) | 2000-08-31 |
Family
ID=22272267
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1999/004363 WO2000050810A1 (en) | 1999-02-26 | 1999-02-26 | Switch cover plate providing automatic emergency lighting |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1155259A4 (en) |
JP (1) | JP2002538579A (en) |
KR (1) | KR20010106107A (en) |
CN (1) | CN1305574A (en) |
AU (1) | AU761811B2 (en) |
CA (1) | CA2329042A1 (en) |
MX (1) | MXPA00011349A (en) |
WO (1) | WO2000050810A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201015162Y (en) * | 2007-01-24 | 2008-01-30 | 东贝光电科技股份有限公司 | Switch base with emergency lighting lamp |
CN201112991Y (en) * | 2007-09-04 | 2008-09-10 | 东贝光电科技股份有限公司 | Socket with emergency lighting lamp |
CN201112992Y (en) * | 2007-09-14 | 2008-09-10 | 东贝光电科技股份有限公司 | Socket structure with emergency lighting lamp |
KR100839208B1 (en) * | 2008-01-31 | 2008-06-17 | (주)부흥이앤씨 | Power switch |
EP3815198A4 (en) * | 2018-05-18 | 2021-07-14 | O'Reilly Winship, LLC | Electrical outlet cover with integrated lighting |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2863038A (en) * | 1956-10-15 | 1958-12-02 | Dominick A Lombardo | Auxiliary outlet with emergency light |
US3739226A (en) * | 1971-09-08 | 1973-06-12 | W Seiter | Emergency light unit for mounting to an electrical wall outlet |
US4177500A (en) | 1978-09-29 | 1979-12-04 | Thomas H. Nicholl | Power failure light and circuit therefor |
US4461974A (en) | 1982-06-09 | 1984-07-24 | David Chiu | Dual light source |
US4514789A (en) | 1984-03-07 | 1985-04-30 | Jester Michael H | Illuminated light switch plate with LED and oscillator circuit |
US4631649A (en) | 1985-10-16 | 1986-12-23 | Chloride Systems, a division of Chloride Power Electronics, Incorporated | Plug-in emergency light fixture |
US4977351A (en) | 1986-11-18 | 1990-12-11 | Bavco Manufacturing Company, Inc. | Emergency lighting system |
US5132596A (en) | 1991-09-18 | 1992-07-21 | Pacific Scientific Company | Outdoor lighting controls |
US5336977A (en) | 1993-05-18 | 1994-08-09 | Li Ming Chun | Emergency lighting device |
US5473517A (en) | 1995-01-23 | 1995-12-05 | Blackman; Stephen E. | Emergency safety light |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3746877A (en) * | 1971-03-08 | 1973-07-17 | W Seiter | Emergency light unit |
US5833350A (en) * | 1997-04-25 | 1998-11-10 | Electro Static Solutions, Llc | Switch cover plate providing automatic emergency lighting |
-
1999
- 1999-02-26 WO PCT/US1999/004363 patent/WO2000050810A1/en not_active Application Discontinuation
- 1999-02-26 EP EP99909673A patent/EP1155259A4/en not_active Withdrawn
- 1999-02-26 CA CA002329042A patent/CA2329042A1/en not_active Abandoned
- 1999-02-26 JP JP2000601367A patent/JP2002538579A/en not_active Withdrawn
- 1999-02-26 MX MXPA00011349A patent/MXPA00011349A/en not_active IP Right Cessation
- 1999-02-26 KR KR1020007011888A patent/KR20010106107A/en not_active Application Discontinuation
- 1999-02-26 AU AU28827/99A patent/AU761811B2/en not_active Ceased
- 1999-02-26 CN CN99807189A patent/CN1305574A/en active Pending
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2863038A (en) * | 1956-10-15 | 1958-12-02 | Dominick A Lombardo | Auxiliary outlet with emergency light |
US3739226A (en) * | 1971-09-08 | 1973-06-12 | W Seiter | Emergency light unit for mounting to an electrical wall outlet |
US4177500A (en) | 1978-09-29 | 1979-12-04 | Thomas H. Nicholl | Power failure light and circuit therefor |
US4461974A (en) | 1982-06-09 | 1984-07-24 | David Chiu | Dual light source |
US4514789A (en) | 1984-03-07 | 1985-04-30 | Jester Michael H | Illuminated light switch plate with LED and oscillator circuit |
US4631649A (en) | 1985-10-16 | 1986-12-23 | Chloride Systems, a division of Chloride Power Electronics, Incorporated | Plug-in emergency light fixture |
US4977351A (en) | 1986-11-18 | 1990-12-11 | Bavco Manufacturing Company, Inc. | Emergency lighting system |
US5132596A (en) | 1991-09-18 | 1992-07-21 | Pacific Scientific Company | Outdoor lighting controls |
US5336977A (en) | 1993-05-18 | 1994-08-09 | Li Ming Chun | Emergency lighting device |
US5473517A (en) | 1995-01-23 | 1995-12-05 | Blackman; Stephen E. | Emergency safety light |
Non-Patent Citations (1)
Title |
---|
See also references of EP1155259A4 * |
Also Published As
Publication number | Publication date |
---|---|
JP2002538579A (en) | 2002-11-12 |
EP1155259A1 (en) | 2001-11-21 |
CN1305574A (en) | 2001-07-25 |
AU2882799A (en) | 2000-09-14 |
AU761811B2 (en) | 2003-06-12 |
KR20010106107A (en) | 2001-11-29 |
EP1155259A4 (en) | 2005-12-07 |
MXPA00011349A (en) | 2003-04-22 |
CA2329042A1 (en) | 2000-08-31 |
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