Structure of flasher bulb

Details Structure of flasher bulb Structure of flasher bulb

1986-01-08

1988-02-16

Boudreau, Leo H.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Electric switch inside evacuated or gas filled envelope

445 27, 315185S, 315 72, 315 74, 315122, 315125, H01J 1978, H01J 744

Patent

active

047257601

ABSTRACT:
A flasher bulb and method of making same by mass production techniques are disclosed. The flasher bulb has first and second nickel wires connected by a tungsten wire to form a loop and a bimetallic strip one end of which is connected to one of the nickel wires, the strip being bent towards the other nickel wire. When the strip is heated by passage of current through the tungsten wire, it makes contact with the other nickel wire to take the tungsten wire out of circuit but retain current flow through the nickel wires. Accordingly in a string of flasher bulbs, extinction of one bulb will not necessary cut off current to the others. The conductive wires and bimetallic strip are assembled in position in a mold and held in place by an insulating disk.

REFERENCES:
patent: 2235360 (1941-03-01), Davis
patent: 2318700 (1943-05-01), McCabe
patent: 2760120 (1956-08-01), Fisherman

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