Door alarm system responsive to forced entry

Details Door alarm system responsive to forced entry Door alarm system responsive to forced entry

1974-02-19

1976-08-31

Caldwell, John W.

Communications: electrical

Systems

Call station

340276, 29234112, 200 6164, G08B 1308, H01H 2706

Patent

active

039784673

ABSTRACT:
Alarm system in which the latch plate of the door jamb is movable to contact a striker plate spaced and insulated therefrom to close an alarm circuit. The system is so designed that if an attempt is made to force the lock, the latch plate which is resiliently mounted will move and thus make contact with the striker plate. A contact relay and thermal relay are incorporated in the alarm system in such a way that the alarm can be timed to signal for a predetermined length of time after which it will automatically shut off. As soon as the alarm signal has stopped the system is ready to signal again.

REFERENCES:
patent: 2133602 (1938-10-01), Waterbury
patent: 2660632 (1953-11-01), Makishima
patent: 2866181 (1958-12-01), Gordon
patent: 3058092 (1962-10-01), Johnson
patent: 3147468 (1964-09-01), Daniels
patent: 3727210 (1973-04-01), Hawkins
patent: 3787832 (1974-01-01), Bolinger

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