Electric blanket safety circuit

Details Electric blanket safety circuit Electric blanket safety circuit

1981-11-23

1984-03-13

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219212, 219508, 361 56, 361 2, H05B 102

Patent

active

044369867

ABSTRACT:
A safety circuit for deenergizing an electric blanket of the type utilizing a positive coefficient resistance material as the heating element positioned between a pair of spaced conductor wires. The circuit includes one or more gas tubes with parallel resistances connected across the conductor wires to sense voltage changes caused by open or short circuits and to conduct sufficiently high currents to blow a series connected fuse.

REFERENCES:
patent: 3215896 (1965-11-01), Shattuck et al.
patent: 3325718 (1967-06-01), McNulty
patent: 3493815 (1970-02-01), Hurtle
patent: 3600634 (1971-08-01), Muench, Jr.
patent: 3628093 (1971-12-01), Crowley
patent: 3845355 (1974-10-01), Lawson
patent: 3878434 (1975-04-01), Voorhoeve
patent: 3968407 (1976-07-01), Wilson
patent: 4034185 (1977-07-01), Crowley
patent: 4251718 (1981-02-01), Cole
patent: 4277673 (1981-07-01), Kelly

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