Alarm system for coin-operated telephone

Details Alarm system for coin-operated telephone Alarm system for coin-operated telephone

1974-07-15

1976-09-28

Caldwell, John W.

Communications: electrical

Systems

Call station

200 6168, 200321, 340280, G08B 1300

Patent

active

039835510

ABSTRACT:
An alarm system for locking receptacles having an actuating arm, such as a latch bolt, engaging a fixed portion of the receptacle, the system including a switch having an arm for engageably coacting with the actuating arm in the locked position, with the switch open. Upon removal of the actuating arm, by force or otherwise, the switch arm, which is normally biased to a closed position, is released to activate an alarm circuit which includes a power source and a horn or bell or the like. Retaining means are provided to engage the switch arm to maintan it against its bias to inactivate the alarm system when access to the locking receptacle is desired by an authorized person.

REFERENCES:
patent: 2866181 (1958-12-01), Gordon
patent: 3402405 (1968-09-01), Contreras
patent: 3579222 (1971-05-01), Freeman
patent: 3696410 (1972-10-01), Wetzel et al.
patent: 3714643 (1973-01-01), Sosin et al.
patent: 3742162 (1973-06-01), Wasemann
patent: 3768087 (1973-10-01), Kaye et al.
patent: 3842410 (1974-10-01), Gopperton
patent: 3851325 (1974-11-01), Maged

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