Air purged portable electric lamp

Details Air purged portable electric lamp Air purged portable electric lamp

1995-04-28

1996-05-21

Yeung, James C.

Illumination

With filament control means responsive to fracture of light...

362 22, 362267, 362158, F21V 2500

Patent

active

055195873

ABSTRACT:
A portable electric lamp suitable for use in hazardous locations has the fixture purged with breathable air a predetermined time before power is coupled to energize the lamps. The fixture is continuously purged during operation. If the internal pressure falls below a predetermined minimum level, or exceeds a predetermined maximum during operation, power to the lamps is shut off, and the complete start cycle, including the time delay, must be undertaken before the lamps can be re-started. All leads and components are either potted or operated at an intrinsically safe power level.

REFERENCES:
patent: 4276580 (1981-06-01), Rogers
patent: 4961111 (1990-10-01), Herlitz et al.
patent: 5068720 (1991-11-01), Herlitz et al.
patent: 5088015 (1992-02-01), Baggio et al.

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