Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1980-06-10
1981-04-14
Little, Willis
Electricity: circuit makers and breakers
Liquid contact
Time delay
200153T, 200324, 200327, 200332, 340574, H01H 342
Patent
active
042621801
ABSTRACT:
An alarm switch includes a hollow casing having a keyhole and a finger opening formed therein, at least one electrical switch mounted in the casing having a spring-loaded actuation pin, a reversible cam pivotably mounted in the casing for movement between a first position, in which it is held in biased engagement with the switch pin so as to maintain the pin in a retracted biased state, and a second release position, in which it is disposed in a substantially non-engaging position with said pin so as to permit extension of said pin and triggering of an alarm signal by the electrical switch, a block slidably mounted in the casing having at least one latch lug which, in a first position of the block, maintains the cam in biased engagement with the switch pin and, in a second position of the block, releases the cam to permit movement to its release position so as to thereby activate the alarm. The cam has a bevelled end face and is removably mounted in said casing to permit mounting thereof with its bevelled end face directed towards or away from the actuation pin. Depending upon the cam disposition, the switch will function as either a momentary or latching switch. Depending on the block position, the switch will function as a finger operated or trip wire operating switch.
REFERENCES:
patent: 2919333 (1959-12-01), Scholen et al.
patent: 3054869 (1962-09-01), Everett
patent: 3423554 (1969-01-01), Acord
patent: 3440635 (1969-04-01), Hull
patent: 3676625 (1972-07-01), Blatt
patent: 4060704 (1977-11-01), Cole
Collard Allison C.
Galgano Thomas M.
Little Willis
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