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An electrical radiation heater for a glass ceramic plate, which serves as a cooking plate, comprises an electrical heating strip mounted on an insulating sheet. The heating strip is slit alternately from opposite edges to give it a zig-zag shape and is bent or curved so that it undulates in serpenti

An electrical radiation heater for a glass ceramic plate, which serves as a cooking plate, comprises an electrical heating strip mounted on an insulating sheet. The heating strip is slit alternately from opposite edges to give it a zig-zag shape and is bent or curved so that it undulates in serpentine fashion. The strip is laid edge-on onto the insulating sheet and anchoring tabs integral with the strip penetrate the insulating sheet. The insulating sheet is laid on an insulating layer which is received in a flat bottomed supporting dish or tray and which is made from a good thermally insulating as well as electrically insulating material.

대표청구항 ▼

An electrical radiation heater for a glass ceramic plate, which forms a cooking plate, comprising: support means for said glass ceramic plate; a lining made from highly thermally insulating, temperature-resistant material disposed in said support means; a thin sheet, having a substantially flat uppe

An electrical radiation heater for a glass ceramic plate, which forms a cooking plate, comprising: support means for said glass ceramic plate; a lining made from highly thermally insulating, temperature-resistant material disposed in said support means; a thin sheet, having a substantially flat upper surface consisting of high temperature-resistant insulating material, said sheet comprising a fibrous material and an inorganic binding agent, said sheet being disposed beneath said ceramic plate, disposed on said lining; a heating conductor strip disposed on said sheet, insulating and temperature resistant ring means located in said support means and engaging over the outer periphery of said sheet to hold the latter down on said lining at its outer periphery, said sheet and said ring means having greater mechanical strength and lower thermal insulating characteristics than said lining; said heating conductor strip being relatively thick and having slits extending alternately from opposite edges thereof to define a zig-zag shape in said strip, said heating conductor strip furthermore having a back and forth curvature to define a serpentine form and being in edge-on engaGement with said upper surface; a plurality of anchoring tab means formed integrally with said conductor strip, said tab means projecting from said sheet engaging edge at spaced intervals and being at least partially pierced through said insulating sheet; and, electrical terminal connection means for said conductor strip.