Circuit energization indicator with thermal timing means to main

Details Circuit energization indicator with thermal timing means to main Circuit energization indicator with thermal timing means to main

1975-09-22

1977-08-23

Swann, III, Glen R.

Communications: electrical

Systems

Call station

99342, 219453, 307117, 337107, 337376, H01H 3708, H01H 6102

Patent

active

040443485

ABSTRACT:
A thermal timer produces a timed duration output in response to a thermal input to a thermal storage device and a thermal energy leakage parameter from that storage device. The storage device preferably is a metal slug positioned in a silica aerogel insulative powder environment, and the thermal input is supplied by an electrically energized PTC heater. A thermostat output device monitors the temperature of the heater and the storage device to effect a distinguishable output, for example, by completing or opening an electrical circuit, in response to the temperature thereof. The thermal timer may be utilized in a range appliance or the like to effect a warning indication during cool down of that appliance.

REFERENCES:
patent: 3612826 (1971-10-01), Deaton
patent: 3617971 (1971-11-01), Ellenberger
patent: 3840834 (1974-10-01), Obenhaus et al.
patent: 3852695 (1974-12-01), Northrup, Jr.
patent: 3852728 (1974-12-01), Flagg, Jr.
patent: 3909812 (1975-09-01), Satorius

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