Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1979-09-14
1981-01-13
Kucia, Richard R.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219502, 219519, 219497, 219506, 99329R, 99342, H05B 102
Patent
active
042451485
ABSTRACT:
A control circuit is disclosed suitable for use with a toaster or other food browning device which utilizes a radiant energy source to brown food. A light sensitive variable resistor, or photocell, is optically coupled to light reflected from the food being browned in the device. A voltage generated by a voltage divider including the light sensitive resistor therein is compared with a preselectable voltage generated by a second voltage divider to determine whether the heat source should be turned on or off. Suitable solid state control circuitry is provided to ensure that a start-up delay is provided at the beginning of each browning cycle and to reset the circuit for future operation when the desired browning of the food is achieved.
REFERENCES:
patent: 2114000 (1938-04-01), Vidaver
patent: 2631523 (1953-03-01), Olving
patent: 3426969 (1969-02-01), Anderson, Jr.
patent: 3606151 (1971-09-01), Dumast et al.
patent: 3881085 (1975-04-01), Traister
patent: 3944893 (1976-03-01), Hayden
patent: 3956978 (1976-05-01), Borley
patent: 3973140 (1976-08-01), Phillips
patent: 4167663 (1979-09-01), Granzow, Jr.
Gisske Edward T.
Sandberg Robert J.
Kucia Richard R.
Paschall M. A.
Wisco Industries, Inc.
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