Communications: electrical – Selective – Having indication or alarm
Patent
1980-02-11
1982-04-13
Swann, III, Glen R.
Communications: electrical
Selective
Having indication or alarm
250206, 315 77, 307 10LS, B60Q 100
Patent
active
043250521
ABSTRACT:
Trailer taillights are electrically controlled in response to the operation of a tow vehicle's taillights. Light emitted by the towing vehicle taillights is detected by electronic light sensors. The sensors are connected to circuits equipped with taillight switching devices for left and right brake or turn indication controlled by level discriminating circuits. The circuit operation involves a threshold of detection which automatically varies in response to the light level sensed in the present and immediate past thus allowing operation in the differing light conditions associated with sunlight and illuminated or non-illuminated tow vehicle running lights. Trailer running lights are controlled principally by detection of the trailer's motion and secondarily by detection of the tow vehicle taillights. Trailer running lights are further controlled by a time delay circuit providing continued operation for a period of time after the trailer comes to rest. An auxiliary inertial deceleration sensor can also provide a trailer braking indication when moderate or strong braking deceleration occurs.
REFERENCES:
patent: 1450549 (1923-04-01), Howard
patent: 3144561 (1964-08-01), Farrell
patent: 3671757 (1972-06-01), Klein
patent: 3848227 (1974-11-01), Helm
patent: 4006453 (1977-02-01), Bryant
patent: 4064413 (1977-12-01), Andersen
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