Thermal switch and dual filament long life lamp

Details Thermal switch and dual filament long life lamp Thermal switch and dual filament long life lamp

1980-10-06

1983-05-03

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Multiple filament load devices

315 73, 315 74, 315 93, 315362, 337159, 337229, 337251, H05B 3910

Patent

active

043822096

ABSTRACT:
A three-terminal thermal switch having a common connector arm biased against a terminal of fusible material. When the terminal is softened or melted by current, the connector arm is released and moves into contact against a second terminal. Positioned in the base of a long-life dual-filament incandescent light bulb, the switch causes one filament to be energized until it burns out, and then connects the other filament to be energized.

REFERENCES:
patent: 1468264 (1923-09-01), Gordon
patent: 1838372 (1931-12-01), DeCastro
patent: 2049338 (1936-07-01), Trope
patent: 2114511 (1938-04-01), Tremblay
patent: 3629766 (1971-12-01), Gould

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