Electrical heating means for cookers or hot plates

Claim 1

An electrical heating means for cookers and hot plates having a heat-radiation transmitting plate, a heat-resistant support member spaced from and disposed below a portion of the heat-radiation transmitting plate, heat insulating means spaced from and disposed below a portion of said support member and having a heat reflecting surface facing said support member for reflecting heat, said support member being adapted to receive at least one electric heater filament, at least one electric heater filament disposed in said support member, said support member being disposed within a hollow space between said heat-radiation transmitting plate and said heat insulating means, said support member being provided with cut-out portions enforcing convection of air enclosed within said hollow space, said reflecting surface being disposed so that a substantial portion of the heat radiated downwards by said heater filament is directed partially by reflection at said heat reflecting surface and partially by the air current passing over said heat reflecting surface onto said heat-radiation transmitting plate and onto a vessel standing thereupon, said support member having grooves for receiving said heater filament, said heater filament being helically wound and arranged in the grooves of said support member, the bottom of said grooves being provided with the cut-out portions, through which a convective air current is drawn and directed upwards against said heat-radiation transmitting plate through said heater filament when in heated state, said support member having between the windings of said heater filament additional cut-out portions through which the convective air current streams downwards against the heat reflecting surface, said support member having a flange around the periphery thereof, an upper surface of the flange contacting a lower surface of the heat-radiation transmitting plate and a lower surface of the flange contacting said heat insulating means so that said flange encloses the space between said heat-radiation transmitting plate and said support member and the space between said support member and said heat insulating means.