Microwave oven interlock switch safety

Details Microwave oven interlock switch safety Microwave oven interlock switch safety

1976-03-04

1977-10-18

Grimley, Arthur T.

Electric heating

Metal heating

Of cylinders

337126, H05B 906

Patent

active

040547698

ABSTRACT:
A protector switch is added in the power supply to open on failure of the door interlock switch to open when the oven door is opened. The monitor switch that closes as the door opens, after the door switch should open, will if the latter does not occur create a power short-circuit ahead of the oven; in this circuit there is a heat responsive electrical resistance element that mechanically holds the protector switch closed against a switch opening bias. Such element will fail under the short circuit current and release the protector switch to shut off the power to the oven. The resistance element can be a wire of predetermined resistance, with current limiting capability, or an off-the-shelf control resistor.

REFERENCES:
patent: RE28822 (1976-05-01), Fritts
patent: 2354933 (1944-08-01), Winborne
patent: 3340374 (1967-09-01), Shiraishi et al.
patent: 3497839 (1970-02-01), Jakobs
patent: 3699300 (1972-10-01), Buerki
patent: 3857067 (1974-12-01), Zanboorie
patent: 3968380 (1976-07-01), Jost et al.

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