Prealarm system for an anti-theft alarm

Details Prealarm system for an anti-theft alarm Prealarm system for an anti-theft alarm

1992-03-10

1993-06-01

Swann, III, Glen R.

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

340429, B60R 2510

Patent

active

052164071

ABSTRACT:
A prealarm system is provided for an anti-theft alarm where a signal from a displacement/vibration detector is picked up by a one-shot timer circuit. If no other activation signal is picked up after the first signal is received a main control alarm circuit is activated for (1) driving a siren circuit to generate a short chirp sound as an audible warning, and (2) a flashing circuit to flash a light for a preset period of time as a visible warning. If the number of activation signals received subsequent to the first are greater than a predetermined threshold number, or the activation signal continues for a predetermined period of time, the main control alarm circuit is activated for driving, (1) the siren circuit to give a normal audible signal alarm, and (2) both, the flashing circuit for flashing a light and the dome light control to provide visible signals.

REFERENCES:
patent: 4987402 (1991-01-01), Nykerk
patent: 5049867 (1991-09-01), Stouffer

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