Emergency vehicle warning light

Claim 1

An emergency vehicle warning light comprising an elongated housing adapted to be mounted atop an emergency vehicle with its length extending transversely of the vehicle, said housing including a hollow base carrying three aligned lamp units for oscillation about vertical axes and spaced equally along the housing length, each unit including a hollow vertical post journaled in said base, a motor mounted inside said base, means coupling said motor with each of said posts for oscillating the same, electric current-conducting disc means on each post at the lower end thereof, bracket means for each disc means mounted in said base and being in electrical contact with said disc means, first electrical conduit means coupling a source of e.m.f. to each bracket means and said motor and second electrical conduit means coupling each of said lamp units and said motor to ground, and third electrical conduit means extending through each hollow post and connecting a lamp with the disc means on the post associated with said lamp, the middle of said lamp units including two sealed beam lamps and the end units each including a single lamp, the disc means for said middle unit including a grooved disc having a separate portion for each lamp of said middle unit, said bracket means associated with said middle unit including a pair of brackets each arranged to contact only one of said portions, said third electrical conduit means for said middle unit including a pair of wires, one for each lamp and connected to said middle unit disc means on opposite sides of said groove, said coupling means including an elongated flat plate having its length aligned with the housing length and having a longitudinally extending slot therein, the middle unit post extending through said slot, said plate having racks extending from opposite ends thereof for engagement with pinion gears on the posts of said end units, said plate being equipped with pin means for engagement with fork means on the post of said middle unit, crank means coupling said motor and plate, said racks being positioned on opposite sides of said plate ends to oscillate said end units in opposite directions with a given plate movement.