H - Electricity – 02 – H
Patent
H - Electricity
02
H
309/14
H02H 5/04 (2006.01) H05B 3/34 (2006.01)
Patent
CA 1115318
-28- Abstract of the Disclosure In an electric bedcover of a type wherein a safety thermostat having a bimetallic element is adapted to deenergize a heater when the bimetallic element is heated sufficiently, as when an overheated condition obtains, an elongated flexible sensor of a type com- prising a pair of conductors spaced from each other by a layer of material having a negative temperature co- efficient of resistance is adapted to influence the bimetallic element through a resistor, which is mounted for heat dissipation to the bimetallic element, and a first circuit branch comprising the resistor, the con- ductors, and the layer between the conductors, in series with each other, is connected so as to maintain the con- ductors at different potentials when the heater operates, and so as to conduct sufficient current to cause said resistor to conduct sufficient heat to cause said bi- metallic element to open said contacts when some part of the layer between the conductors is heated so as to act as an electrical conductor having a low impedance rather than as an electrical insulator having a high impedance. Both such circuit branches are confined by a network of serpentine passages within a fabric shell of the electric blanket.
347010
Ridout & Maybee Llp
Sunbeam Corporation
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