Thermal switch assembly for electric lamps

Details Thermal switch assembly for electric lamps Thermal switch assembly for electric lamps

1990-12-27

1992-12-22

Pascal, Robert J.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Electric switch inside evacuated or gas filled envelope

313601, 337 85, H01J 6100

Patent

active

051736390

ABSTRACT:
A thermal switch assembly for use in electric lamps includes a bimetal element and a resilient conductor such as a tungsten wire. The conductor is mounted at an angle in the range of about 30.degree. to 45.degree. with respect to the plane of movement of the bimetal element and at an angle of about 90.degree. with respect to the longitudinal axis of the bimetal element. The edge of the bimetal element contacts the conductor at a closure temperature and moves with a sliding action along the conductor as the temperature increases above the closure temperature. As a result, the switch contacts are self cleaning. Since the switch components are subjected to very little stress at elevated temperatures, the switch assembly has a long operating life. The bimetal element and the conductor can be affixed to a mounting frame which facilitates installation of the thermal switch assembly.

REFERENCES:
patent: 3226597 (1965-12-01), Green
patent: 3619710 (1971-11-01), Waymouth
patent: 3753019 (1973-08-01), Hellman
patent: 3965387 (1976-06-01), Stuart et al.
patent: 4413206 (1983-11-01), Karlotski et al.
patent: 4433271 (1984-02-01), Inoue et al.
patent: 4659965 (1987-04-01), Bonazoli
patent: 5015916 (1991-05-01), Mazza et al.

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