F - Mech Eng,Light,Heat,Weapons – 21 – V
Patent
F - Mech Eng,Light,Heat,Weapons
21
V
240/143
F21V 5/02 (2006.01)
Patent
CA 1258056
ABSTRACT The luminaire of the disclosure includes a housing, with a top portion and side walls forming a downwardly facing opening, and a light source, preferably flourescent lighting tubes with conventional mountings and wiring connections. At the lower or bottom portion of the housing a louver extends across the opening of the housing with a plurality of open cells extending through the louver between the light source and the area outside the fixture. Extending completely across the lower portion of the louver is a sheet of translucent material, preferably hermetically sealed to the louver. The sheet can be formed of any material possessing the property of good light transmittance, and in one embodiment is a clear resin. In another embodiment, the sheet is formed of an opalescent material, In still another embodiment, the sheet can be grooved on the bottom surface thereof to interrupt the surface and minimize reflections. The sheet prevents the entry of airborne dust into the cells in the louver, thereby precluding the buildup of dust and dirt that requires serious maintenance efforts to remove. In another embodiment a second or top sheet of translucent material is heremetically sealed to the top surface of the louver, thus insuring that no dust, from whatever direction, can be deposited on the louver walls. This top sheet can be either a transparent or an opalescent material.
526408
Barrigar & Oyen
Metropolitan Life Insurance Company
LandOfFree
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