Internal pilferage alarm

Details Internal pilferage alarm Internal pilferage alarm

1988-05-26

1990-04-24

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

34030915, G08B 1308

Patent

active

049203339

ABSTRACT:
An alarm system for monitoring an entrance/exit from a premises is provided with a deadbolt switch, timing mechanism, alarm circuitry and an alarm indicator. The alarm system is activated when the deadbolt is unlocked. The alarm circuitry determines if the unlocking of the deadbolt was authorized or unauthorized. If the unlocking was unauthorized, the alarm indicator is activated. If the unlocking was authorized, the timing mechanism is activated. If the deadbolt is not relocked within the time period preset into the timing mechanism, the alarm indicator is activated. The timing mechanism may be reset by authorized persons to allow the deadbolt to remain open for additional time periods, one period at a time.

REFERENCES:
patent: 3662372 (1972-05-01), Levy
patent: 4543568 (1985-09-01), Hwang
patent: 4683460 (1987-07-01), Nakatsugawa
patent: 4707684 (1987-11-01), Janke et al.

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