Vehicle anti-theft alarm system

Details Vehicle anti-theft alarm system Vehicle anti-theft alarm system

1975-06-02

1976-12-14

Caldwell, John W.

Communications: electrical

Selective

Having indication or alarm

307 10AT, B60R 2510

Patent

active

039978702

ABSTRACT:
An electrical-electronic circuit for operating the horn and headlights of a car in a manner which will give audible and visual warning of a theft attempt. The circuit includes a suitably located tamper switch for each door or other closure member of the car and a number of electronic devices which combine with the tamper switches to control the flow of current between a master switch and a relay switch. The master switch is associated with one of the car door locks and this normally open switch is closed to arm the circuit whenever the key is turned in the lock to secure the door.

REFERENCES:
patent: 3247402 (1966-04-01), Hayden
patent: 3422398 (1969-01-01), Rubin
patent: 3513466 (1970-05-01), Isaacs et al.
patent: 3585584 (1971-06-01), Behrend
patent: 3824539 (1974-07-01), Horvath
patent: 3891967 (1975-06-01), Betts

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