H - Electricity – 02 – H
Patent
H - Electricity
02
H
309/14
H02H 5/04 (2006.01) H05B 3/34 (2006.01)
Patent
CA 1115317
Abstract of the Disclosure In an electric bedcover comprising a fabric shell, which has a network of serpentine passages within its plies, an elongated flexible heater, which is deployed through at least some of the passages, a thermoresponsive device, which controls delivery of power to the heater as an inverse function of tem- perature of said thermoresponsive device, a resistor, which is mounted for heat dissipation from the resistor to the thermostatic device, and an elongated flexible sensor, which comprises a pair of elongated flexible conductors spaced by an elongated flexible layer of material having a negative temperature coefficient of resistance, which is deployed through at least some of the passages, and which is adapted to influence the thermoresponsive device through the resistor, a circuit branch comprising the resistor, the conductors, and the layer between the conductors, in series with each other, is connected so as to maintain the conductors at relatively different electrical potentials at least when the heater operates, so as to conduct little current except when some part of the layer between the conductors is heated so as to act as an electrical conductor rather than as an electrical insulator, as in an overheated condition of at least part of said electric bedcover, and so as to conduct suf- ficient current to cause the resistor to dissipate sufficient heat to cause the thermoresponsive device essentially to termi- nate delivery of power to the heater when the layer between the conductors thus acts as a shunt between the conductors of the sensor.
346539
Ridout & Maybee Llp
Sunbeam Corporation
LandOfFree
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