Electric heating – Heating devices – With current connection and/or disconnection means
Patent
1979-03-05
1981-07-28
Rubinson, Gene Z.
Electric heating
Heating devices
With current connection and/or disconnection means
219212, 219508, H05B 102, H02H 102
Patent
active
042812372
ABSTRACT:
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 occurs, an elongated flexible sensor of a type comprising a pair of conductors spaced from each other by a layer of material having a negative temperature coefficient 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 conductors, and the layer between the conductors, in series with each other, is connected so as to maintain the conductors at different potentials when the heater operates, and so as to conduct sufficient current to cause the resistor to conduct sufficient heat to cause the bimetallic element to open the 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.
REFERENCES:
patent: 774623 (1904-11-01), Wales
patent: 2565478 (1951-08-01), Crowley
patent: 3408469 (1968-10-01), Mills
patent: 3493727 (1970-02-01), Hosokawa et al.
patent: 3628093 (1971-12-01), Crowley
patent: 3708649 (1973-01-01), Crowley et al.
patent: 3803385 (1974-04-01), Sandorf
patent: 3814899 (1974-06-01), Gordon, Jr. et al.
Clark George R.
Hoover Allen J.
Paschall M.
Rose Neil M.
Rubinson Gene Z.
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