Electronic alarm bolt

Details Electronic alarm bolt Electronic alarm bolt

1974-08-16

1976-06-15

Swann, III, Glen R.

Communications: electrical

Systems

Call station

340256, 340274C, G08B 1308

Patent

active

039640434

ABSTRACT:
A self contained alarm device has within a housing a first and second switching means wherein when a circuit is opened across a pair of control terminals the first switching means energizes the second switching means which then becomes independent of the state of the first switching means or the circuit across the control terminals. When the second switching means is energized it operates an alarm means until the former is purposely reset by means of a thermally operated switching device. In addition the alarm device can be selectively defeated by choosing a particular position of a multiposition switch to insure that a closed circuit exists across the control terminals.

REFERENCES:
patent: 1573802 (1926-02-01), Cadenel
patent: 3513466 (1970-05-01), Isaacs et al.
patent: 3609739 (1971-09-01), Walter
patent: 3623087 (1971-11-01), Gallichotte et al.
patent: 3781861 (1973-12-01), Adler, Jr. et al.
patent: 3851326 (1974-11-01), Costa

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