Electrically normally closed switch device

Details Electrically normally closed switch device Electrically normally closed switch device

1989-05-11

1991-09-24

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Plural switches

307132E, 361 54, 361189, H01H 4700

Patent

active

050516043

ABSTRACT:
A mechanically normally open low voltage switch is connected between ground and the high impedance input of a low voltage electronic circuit fed by a low voltage source through a low impedance resistor. With the switch open, current flows into high impedance input of the electronic circuit to provide the electrically normally closed function. When the switch is actuated to the closed position, the high impedance input is pulled down to ground to provide the switch open function.

REFERENCES:
patent: 4476355 (1984-10-01), Mital
patent: 4523251 (1985-06-01), Erdmann et al.
patent: 4692834 (1987-09-01), Iwahashi et al.
patent: 4720763 (1988-01-01), Bauer

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