H - Electricity – 05 – B
Patent
H - Electricity
05
B
309/83
H05B 3/68 (2006.01) F24C 15/10 (2006.01)
Patent
CA 1081754
ABSTRACT The invention comprises a thermostatically controlled electric hotplate assembly comprising a heating plate; electric heating means for heating the plate; bridge means formed of a flexible sheet material connecting the heating plate with the unheated zone; and actuating means for actuating the energization and de-energization of the heating means. The bridge means acts to transform horizontal expansion and contraction of the heating plate respectively into upward and downward vertical movement thereof with respect to the unheated zone and the heating plate is mechanically coupled with the actuating means for respectively de-energizing and energizing the heating plate in response to such upward and downward vertical movement of the plate. In a preferred embodiment, the actuating means comprises a vertical- ly aligned rod urged upwardly into contact with the heating plate, and a switch electrically coupled to the heating means and mechanically coupled with the rod, whereby vertical movement of the rod causes opening and closing of the switch to respectively de-energize and energize the heating means. The invention provides close control of the hotplate temperature without the necessity for costly and failure-prone multi-probe electronic systems.
260286
A/s Ardal Og Sunndal Verk
Borden Ladner Gervais Llp
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