Electric heating – Microwave heating – With diverse device
Patent
1995-04-18
1996-05-28
Leung, Philip H.
Electric heating
Microwave heating
With diverse device
219718, 219723, 219485, 219486, 307 41, 361 88, H05B 668
Patent
active
055213596
ABSTRACT:
An electrical control scheme which permits operating power for a microwave oven and a second electrical appliance, such as a refrigerator, to be withdrawn from a single electrical outlet utilizes electrical contacts across which a voltage differential is generated when the oven is in operation and includes wiring connected between the second electrical appliance and the microwave oven. The included wiring conducts electrical power to the second electrical appliance from the power cord of the microwave oven, and the control system further includes a relay having a normally-closed switch. The switch of the relay is connected in line with the included wiring, and the coil of the relay is connected across the aforementioned electrical contacts of the microwave oven and is responsive to the voltage differential generated across the contacts during microwave oven operation so that as long as the microwave oven is operating, the switch of the relay prevents electrical power to be withdrawn by the second electrical appliance through the wiring and as long as the microwave oven is not operating, the switch of the relay permits electrical power to be withdrawn by the second electrical appliance through the wiring.
REFERENCES:
patent: 3846641 (1974-11-01), Eguchi
patent: 4198553 (1980-04-01), Dills
patent: 4472640 (1984-09-01), Elmer
patent: 4777379 (1988-10-01), Young
patent: 4847722 (1989-07-01), Bennett
patent: 4880954 (1989-11-01), Bennett et al.
patent: 4958055 (1990-09-01), Shim
patent: 5270578 (1993-12-01), Yamamura
Leung Philip H.
McKee Michael E.
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