Stay-hot control for microwave oven

Details Stay-hot control for microwave oven Stay-hot control for microwave oven

1975-12-08

1977-08-30

Grimley, Arthur T.

Electric heating

Metal heating

Of cylinders

H05B 906

Patent

active

040456404

ABSTRACT:
The infra-red browning element of a microwave oven is automatically energized at the end of either the microwave or browning timing cycle, to provide heat to the oven for keeping the food hot (at a lower temperature than that used for browning). This end result is achieved by ganging the timing switch which controls the supply of power to the microwave and browning circuits with a switch which controls the supply of power to the stay-hot circuit. Thus, when the microwave or browning segment of the timing switch opens at the end of the timing cycle, the stay-hot segment of the timing switch is closed to supply power to the stay-hot circuit. A thermostat switch is provided in the stay-hot circuit so that the heat output of the infra-red element is regulated to a suitable temperature for stay-hot operation. Stay-hot operation is selectively set by means of a selector control to provide automatic stay-hot operation at the end of the timing cycle.

REFERENCES:
patent: 3320396 (1967-05-01), Boehm
patent: 3339054 (1967-08-01), Deaton
patent: 3523170 (1970-08-01), Boehm
patent: 3569656 (1971-03-01), White
patent: 3862390 (1975-01-01), Noda
patent: 3875361 (1975-04-01), Fukui et al.

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