Normally closed wafer thin switch

Details Normally closed wafer thin switch Normally closed wafer thin switch

1975-06-02

1977-02-01

Schaefer, Robert K.

Electricity: circuit makers and breakers

Electric switch details

Contact

340280, 200159A, H01H 124

Patent

active

040063364

ABSTRACT:
A normally closed wafer thin switch, particularly intended for pilferage type burglar alarms, comprising a flat base plate of insulating material having an opening therein and a pair of leaf spring contacts attached to one peripheral portion of the plate and extending over the opening. Free ends of the contacts normally engage each other to complete a circuit. A raised tab on a first of the contacts overlies an opposite peripheral portion of the plate whereby, when an object is placed on or against the switch, the tab is depressed against the plate, causing opening of the switch.

REFERENCES:
patent: 259825 (1882-06-01), Davis
patent: 1159701 (1915-12-01), Neahr
patent: 2626388 (1953-01-01), Needleman

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