Heavy duty lamp flasher for trucks, trailers and the like

Details Heavy duty lamp flasher for trucks, trailers and the like Heavy duty lamp flasher for trucks, trailers and the like

1987-06-08

1989-03-28

Orsino, Joseph A.

Communications: electrical

Land vehicle alarms or indicators

External signal light system

340431, 315200A, B60Q 146, B60Q 126, H05B 3700

Patent

active

048168181

ABSTRACT:
A heavy duty lamp flasher for turn signals for trucks, trailers and the like including a switching relay having normally open and normally closed contacts and a moveable relay arm and relay coil, and an arc suppression circuit formed of a transistor or pair of transistors connected in parallel with the switching relay to minimize contact arcing and load carrying limitations. A diode and capacitor pair is connected to an integrated circuit oscillator for activating and deactivating the relay and another diode and capacitor pair is connected to the gate of the transistor and to the relay coil, such that the mechanical contacts of the relay, with their inherent mechanical delay, control the transistor circuitry so that the transistor provides the primary current path during movement of the arm between the normally closed and normally open contacts and the normally open contact provides the primary current path when it is closed.

REFERENCES:
patent: 3413519 (1968-11-01), Leeder, Jr.
patent: 3452248 (1969-06-01), Leeder, Jr.
patent: 3728713 (1973-04-01), Alten
patent: 4150359 (1979-04-01), Mlzuno et al.
patent: 4155069 (1979-05-01), Mason
patent: 4390812 (1983-06-01), Seidler

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