Deadman's switch

Details Deadman's switch Deadman's switch

1978-08-02

1980-03-11

Schmidt, Frederick R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200153T, 200322, 200325, 200330, H01H 320

Patent

active

041929829

ABSTRACT:
A switch includes an actuating element movable against a biasing force from a rest into a working position. The element is engageable with a member movable under a force of a predetermined magnitude applied thereto between a first position corresponding to the rest position of the element and a second position in which it displaces the element into the working position. The member is provided with a spring for urging the member against the applied force into the first position so as to release the actuating element. The member tends to prematurely move into the first position in response to a slight decrease of the applied force to a lever below the predetermined magnitude. The switch is further provided with an arrangement for preventing the premature movement of the member into the first position until after the applied force decreases below the above-mentioned level.

REFERENCES:
patent: 3881081 (1975-04-01), Schilling et al.

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