Vehicle antitheft alarm

Details Vehicle antitheft alarm Vehicle antitheft alarm

1976-08-30

1980-05-27

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

180287, 200 6147, 200 6152, 307 10AT, 340 64, 340528, 340543, 340545, B60R 2510, B60R 2504, G08B 1308

Patent

active

042053005

ABSTRACT:
An antitheft system for vehicles in which an operator actuates a thumbwheel to select one predetermined numerical combination and actuates a push button switch to turn on the system. The operator also actuates the thumbwheel to select another predetermined numerical combination and actuates the push button switch to turn off the system. The actuation of the thumbwheel by an operator to a numerical combination other than one of the predetermined numerical combination results in the operation of an alarm. Disposed within the vehicle are mercury switches, which sense any movement of the vehicle, when the system is turned on. When a mercury switch senses any movement of the vehicle, such as movement caused by the towing of the vehicle or the jacking up of the vehicle, the change of state of the mercury switch initiates the operation of an alarm. Also, the opening of a hood, door or trunk will initiate the operation of an alarm when the system is turned on. The operation of an alarm will also result in the cutoff of power for the ignition system.

REFERENCES:
patent: 2782276 (1957-02-01), Woods
patent: 3074049 (1963-01-01), Saliba et al.
patent: 3513466 (1970-05-01), Isaacs et al.
patent: 3790933 (1974-02-01), Cort
patent: 3921128 (1975-11-01), Snead
patent: 3950678 (1976-04-01), Brewer
patent: 4021796 (1977-05-01), Fawcett et al.

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