Electric heating – Metal heating – Of cylinders
Patent
1988-01-11
1989-05-23
Lung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1064, 219464, H05B 612
Patent
active
048332887
ABSTRACT:
Induction-heated hob or cookplate has a glass-ceramic transparent top plate, one or more inductor coils below the top plate, and a support plate that has cutout or cutouts in which the inductor coil or coils are situated. The inductor coil or coils is in the form of a spiral or flat winding or a square or rectangular flat winding. A converter receives household power (e.g. 220 v, 60 Hz) and provides an alternating current of suitable frequency (e.g. 25 KHz to 30 KHz) to the inductor coils. Between the support plate and the top plate there is an intermediate complex composed, e.g., of a mica sheet and a glass fabric sheet. Markings or decoration are disposed on the underside of the top plate or on the glass fabric sheet, where they are clearly visible through the transparent top plate, but are not subject to abrasion from cooking utensils or scrubbing. The intermediate complex serves as a cushion or shock absorber for the top plate permitting the latter to be of thinner construction than otherwise, thus reducing the spacing from the inductor coil to the cooking utensil. Also, the intermediate complex also serves as a barrier layer preventing liquids from reaching the inductor coils if the top plate should crack.
REFERENCES:
patent: 2458184 (1949-01-01), Marick
patent: 3406279 (1968-10-01), Ziver
patent: 3786222 (1974-01-01), Harnden, Jr. et al.
patent: 3843857 (1974-10-01), Cunningham
patent: 4029926 (1977-06-01), Austin
patent: 4453067 (1984-06-01), Karklys et al.
Cableco
Lung Philip H.
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