Timer

Details Timer Timer

1973-12-19

1976-06-15

Caldwell, John W.

Communications: electrical

Selective

Having indication or alarm

340 52D, 307294, B60Q 134

Patent

active

039640191

ABSTRACT:
There is disclosed a timer for use with a turn signal electrical circuit of a vehicle such as an automobile. The timer includes an audio or visual alarm to indicate to the operator of the vehicle when the turn signals have been actuated for an excessively prolonged period such as caused by failure to cancel the signal after completion of a turn. The timing circuit of the timer employs a silicon controlled rectifier (SCR) with a charging capacitor, which receives a pulsed input from the turn signal circuit, in the triggering circuit of the SCR and in a holding circuit to the SCR to sustain the alarm for several periods of pulsed input from the turn signal circuit. The timer includes a capacitor discharge circuit activated by the brake switch of the vehicle to deactivate the timer when the brake pedal is depressed to avoid premature alarm activation when the vehicle is delayed from turning by traffic or a traffic signal. Preferred embodiments of the timer include a voltage regulating circuit to maintain the preset timing period constant and independent of the electrical loads of the vehicle as well as circuit means to permit fixed adjustability of the duration of the timing period.

REFERENCES:
patent: 3131318 (1964-04-01), Snyder
patent: 3200258 (1965-08-01), Carroll
patent: 3419733 (1968-12-01), Hornung
patent: 3555507 (1967-05-01), Burson
patent: 3806868 (1974-04-01), Portman

Affiliated with

Also associated with

Rating

Timer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Timer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Timer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1697889