Anti-theft device

Communications: electrical – Condition responsive indicating system – Specific condition

Patent

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Details

340636, G08B 1314

Patent

active

050898078

ABSTRACT:
An anti-theft device comprises a circuit which control a relay. The house power is connected to the circuit which energizes the relay. When the relay is energized, the contacts in the relay remain open. A battery and an alarm horn are connected in series with the contacts of the relay. When the power to the circuit is cut off, as during a theft, the relay is de-energized, completing the circuit to the batter and the alarm causing the alarm to sound to warn of a possible theft.

REFERENCES:
patent: 3955183 (1976-05-01), McBrian
patent: 4157542 (1979-06-01), Smith
patent: 4237450 (1980-12-01), Canez
patent: 4654642 (1987-03-01), Groff

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