Proximity switching device

Details Proximity switching device Proximity switching device

1979-08-14

1981-09-01

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307255, 307308, H03K 326

Patent

active

042874408

ABSTRACT:
A proximity switching device is disclosed, which comprises an oscillating circuit including a detection coil, a signal producing circuit for producing a detection signal in response to an oscillating amplitude of said oscillating circuit, and an output circuit for producing an output signal in response to said detection signal. The output circuit comprises a pair of Darlington circuits and a driving transistor for driving said Darlington circuits, one of said Darlington circuits operating as a NPN transistor and another operating as a PNP transistor, said Darlington circuit being connected complementarily for providing complementary output signals.

REFERENCES:
patent: 3003108 (1961-10-01), Thiele
patent: 3260912 (1966-07-01), Gregory
patent: 3919661 (1975-11-01), Buck
patent: 4128742 (1978-12-01), Davis

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