Delay action electric switch
Abstract
Abstract A DELAYED ACTION ELECTRIC SWITCH OF THE DOMESTIC WALL TYPE. IT IS OF STANDARD SIZE AND APPEARANCE, AND REPLACES THE WALL TYPE SWITCH COMMONLY FOUND IN HOMES. IT IS INTENDED AS A CONVENIENCE TO KEEP AN AREA ILLUMINATED FOR A BRIEF PERIOD OF TIME AFTER THE SWITCH HAS BEEN TURNED OFF, PROVIDING TIME TO MOVE FROM ONE AREA TO ANOTHER, SUCH AS FROM GARAGE TO HOUSE. IT EMPLOYS A SMALL STRIP OF BIMETAL, A METAL WHICH BENDS WHEN HEATED. A SMALL RESISTANCE WIRE IS WRAPPED AROUND THE BIMETAL. WHEN THE TOGGLE IS MOVED TO THE SWITCH-OFF POSITION, IT DOES NOT, IN FACT, TURN THE SWITCH OFF, BUT, INSTEAD, CLOSES ANOTHER SET OF SWITCH CONTACTS WHICH CAUSES ELECTRIC CURRENT TO FLOW THROUGH THE RESISTANCE WIRE. HEAT IS THEREBY GENERATED IN THE WIRE WHICH CAUSES THE BIMETAL TO BEND. IT IS THE BENDING MOTION OF THE BIMETAL WHICH ACTUALLY OPERATES THE SWITCH TO THE OFF POSITION. THE HEATING ACTION TAKES PLACE SLOWLY AND PROVIDES THE DELAY PERIOD AFTER THE SWITCH IS MANAUALLY TURNED OFF.
Inventors
- 👤 Horace D Brown
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |