Safety disconnect electric switch

Details Safety disconnect electric switch Safety disconnect electric switch

1976-10-26

1979-04-10

Tudor, Harold

Electricity: circuit makers and breakers

Liquid contact

Time delay

200153LA, 200DIG42, H01H 906

Patent

active

041490533

ABSTRACT:
A trigger switch for portable tools that provides safety disconnect under contact-weld conditions. The switch is a manual close, return spring open, double-snap type wherein the actuator acts on a double-inclined surface of a cam to snap the switch contacts closed or open as the actuator passes the center high point of the cam in one direction or the other. The safety disconnect feature provides in series with the switch contacts a connector biased to flip open that is normally held closed by actuator reactance force on the cam in combination with tripping means therefor. This tripping means includes coacting means between the cam and a contact carrier on which the cam is normally spring-restrained from shifting in the switch opening movement direction of the actuator. If the contacts weld, switch opening movement of the actuator under force of the stored energy of its return spring, and without requiring any additional external force, forcibly shifts the cam to a point allowing it to trip down in the contact carrier and release the connector allowing it to flip open and interrupt the connection permanently.

REFERENCES:
patent: 3194809 (1965-07-01), Epsteen
patent: 3869590 (1975-03-01), Hults
patent: 3953699 (1976-04-01), Teichert

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