Electric heating appliance

Details Electric heating appliance Electric heating appliance

1992-02-19

1992-12-22

Walberg, Teresa J.

Electric heating

Heating devices

Combined with diverse-type art device

219528, 307127, H05B 102, H05B 334

Patent

active

051735873

ABSTRACT:
An electric heating appliance which is provided with a connecting terminal selecting circuit for the purpose of generating heat in an electric heater in a negative cycle of a commercial AC power source no matter which pole of a plug is connected to a grounding electrode of the power source when the plug is inserted into a plug socket of the power source, the connecting terminal selecting circuit consisting of a delay switch circuit adapted to insulate a heater circuit from the power source for a predetermined period of time when a power source switch is turned on, a heater potential detecting circuit adapted to detect the grounding electrode of the power source, and a change-over switch circuit adapted to connect the anode of an electric power controlling rectifying element for controlling the electric heater to the grounding electrode of the AC power source in accordance with an output signal from the heater potential detecting circuit.

REFERENCES:
patent: 3273039 (1966-09-01), Godshalk
patent: 3313960 (1967-04-01), Borys
patent: 3413487 (1968-11-01), Gershen
patent: 3699562 (1972-10-01), Kelly
patent: 4121271 (1978-10-01), Tsai
patent: 4400658 (1983-08-01), Yates
patent: 4492878 (1985-01-01), Hamel

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