Dust resistant electric light fixture

Details Dust resistant electric light fixture Dust resistant electric light fixture

1990-05-18

1991-06-18

Dority, Carroll B.

Illumination

Light source and modifier

With sealing means or artificial atmosphere

362310, 362344, F21V 2900

Patent

active

050253581

ABSTRACT:
An electric light fixture is disclosed which includes a lamp head housing, a lamp or bulb within the housing and an elliptical reflector for focusing light from the lamp to a predetermined focal point. A transparent lens is positioned across the open end of the housing and and extension ring is removably mounted on that open end of the housing and extends away from the housing and the lens. This ring creates an air space beneath the lens within the confines of the ring that traps heat generated from the bulg and reflected to a position within the ring whereby dust particles are deflected away from the lens by convection air flow created as a result of the heat trapped in such space.

REFERENCES:
patent: 3840734 (1974-10-01), Orhm

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