Trailer theft and burglary alarm system

Details Trailer theft and burglary alarm system Trailer theft and burglary alarm system

1987-04-27

1988-04-12

Crosland, Donnie L.

Communications: electrical

Selective

Having indication or alarm

340 52R, 340641, 340687, 307 10AT, 307 10LS, B60R 2500

Patent

active

047377631

ABSTRACT:
A trailer theft and burglary alarm system utilizes the releasable electrical connection between a vehicle light circuit and the trailer brake light circuit to warn the operator that the releasable electrical connection is being tampered with. A signal producing apparatus continuously monitors the resistance of the trailer brake light circuit and produces a signal corresponding thereto. When the vehicle is to be left unattended, the signal is recorded. Thereafter, if the releasable connection is disconnected, the signal produced will differ from the original signal. This difference is recognized and the alarm sounds. Portal sensors can be provided that will produce a change in either the resistance or capacitance sensed by the signal producing apparatus if a portal to the trailer is disturbed. This change in either resistance or capacitance will also alter the signal produced, and trigger the alarm.

REFERENCES:
patent: 3671934 (1972-06-01), Teich
patent: 4037194 (1977-07-01), Boyden et al.
patent: 4127855 (1978-11-01), Toner
patent: 4430637 (1984-02-01), Koch-Ducker et al.

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