Normally closed switch

Details Normally closed switch Normally closed switch

1977-09-26

1978-10-10

Norton, Donald F.

Electricity: circuit makers and breakers

Liquid contact

Time delay

H01H 1352

Patent

active

041198212

ABSTRACT:
A switch case has a top provided with a central opening in which slides the stem of a plunger that has a foot inside the case. A bridging contact spring has a central portion engaging the foot and has free end portions extending away from opposite sides of the foot to form movable contacts normally engaging stationary electric contacts in the case beneath the movable contacts. Between each stationary contact and the central portion of the spring there is a fulcrum member beneath a movable contact so that when the central portion of the spring is moved downwardly by depressing the plunger, the movable contacts will rock on the fulcrum members and lift away from the stationary contacts.

REFERENCES:
patent: 3767878 (1973-10-01), Sykora
patent: 3924089 (1975-12-01), Abernethy
patent: 4046982 (1977-09-01), Schadow

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