H - Electricity – 05 – B
Patent
H - Electricity
05
B
309/76
H05B 3/20 (2006.01) H05B 3/74 (2006.01)
Patent
CA 1141413
ABSTRACT OF THE DISCLOSURE The invention relates to electric heater units for "smooth top" cookers which employ two or more heater elements in the same unit. It is directed particularly at the prob- lem of monitoring the temperature of the unit and/or the "smooth top" thereover to protect against overheating. It is known to use a thermal cut-out device extending over the heater unit where a single element is used, but design prob- lems develop when two or more elements are employed in the same unit, of which at least one is independently energisable. According to the invention an elongate thermal cut-out device (16) extends across said one element (10) but is thermally isolated from the other element or elements (12). Thus, the device (16) operates only in response to the one element (10). Such thermal isolation can be accomplished by enclosing a portion (30) of the device (16) which extends across the other element or elements in a block (26) of thermal insulation material, or in a sheath (32) of thermally conductive material which carries any heat from the other element or elements to a heat sink (2). In a third alterna- tive, the effective length of the device terminates at the boundary (14) of the one element.
369641
Kirby Eades Gale Baker
Micropore International Limited
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