Microwave oven timer

Details Microwave oven timer Microwave oven timer

H - Electricity

01

H

342/19.8

H01H 43/10 (2006.01)

Patent

CA 1257367

ABSTRACT A programmer timer for an appliance, such as microwave cooking oven, having a magnetron power switch positioned by a control selectively moved to one of three power level settings by user rotation of the single rotary knob to a selected position on one of three separate cooking program interval range scales on the dial. Selection of a knob position on the first scale provides a 100% magnetron duty cycle, or full "ON", cooking mode for the desired cooking interval, selection of a knob position on the second scale provides a first predetermined fractional duty cycle for "MEDIUM" power level magnetron operation for the desired cooking interval: and, selection of a knob position on the third scale provides a second predetermined fractional duty cycle for "LOW" or "DEFROST" power level magnetron operation for the desired cooking program interval. A single timing motor drives a cam advance mechanism for effecting time-out of the selected program interval for the three power levels of operation.

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