Electric heating – Metal heating – Of cylinders
Patent
1987-02-25
1989-01-17
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055R, 219486, H05B 668
Patent
active
047989270
ABSTRACT:
A microwave oven includes a heating chamber in which food is heated, a high frequency heating circuit for supplying high frequency energy to the heating chamber, a thermal heater provided in each of the upper and lower areas of the heating chamber, a switching circuit for selecting the high frequency heating circuit or the thermal heaters, a first switching circuit for permitting intermittent power to the high frequency heating circuit when the high frequency heating circuit is selected by the switching circuit, a second switching circuit connected in parallel with the first switching circuit so as to provide a bypass of the first switching circuit when closed, a first contact mounted in the first switching circuit to permit intermittent power supply to one of the two thermal heaters in the heating chamber, and a second contact mounted in the second switching circuit to provide a bypass of the first contact.
REFERENCES:
patent: 2744990 (1956-05-01), Schroeder
patent: 4196330 (1980-04-01), Payne
patent: 4345134 (1982-08-01), Tanaka et al.
patent: 4463238 (1984-07-01), Tanabe
patent: 4469926 (1984-09-01), Komuro
Leung Philip H.
Sharp Kabushiki Kaisha
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