Low level work area lighting system

• US 4,242,723 A
• Filed: 05/14/1979
• Issued: 12/30/1980
• Est. Priority Date: 05/14/1979
• Status: Expired due to Term

• Current Assignee: KCS Lighting Incorporated A Corporation of
• Original Assignee: Keene Corp. (Steel Partners Holdings LP)
• Inventors: Fabbri, William C., Metcalf, Paul T. II
• Primary Examiner(s): Lechert, Jr., Stephen J.
• Application Number:
  US06/038,642
• Time in Patent Office: 596 Days
• Field of Search: 362/33, 362/224, 362/331
• US Class Current: 362/33
• CPC Class Codes: F21S 8/033 the surface being a wall or like vertical structure, e.g. building facade
• CPC Class Codes: F21V 14/06 by movement of refractors in vehicle head lamps F21S41/635
• CPC Class Codes: F21V 5/02 of prismatic shape F21V5/04 takes precedence
• CPC Class Codes: F21W 2131/402 for working places
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes

Abstract

A work area lighting system is provided including a housing containing a linear light source therein and having an open bottom end. A refractor comprising a pair of refractor plate members closes the open bottom end. The refractor includes a first member having a plurality of spaced prisms extending parallel to the light source and a second having a plurality of spaced prisms extending perpendicular to the light source. The second member underlies the first member and both are co-extensive in length with the light source. The refractor plates each have light incident and light emergent surfaces and both plates have their prisms on the light incident surface.

Claims

1. A work area lighting system comprising:

a housing positioned above a work area, said housing having an open-bottom end;

a linear light source mounted within said housing;

a refractor for providing substantially uniform light distribution over the work area in the direction parallel to said light source as well as the direction transverse to the light source, said refractor comprising a pair of overlying plate members mounted to said housing closing said open bottom end, said refractor including first and second refractor plate members each substantially co-extensive in length with said light source;

said first plate member having a light incident surface comprising a plurality of spaced prisms extending parallel to said linear light source; and

said second plate member having a light incident surface comprising a plurality of spaced prisms extending perpendicular to said linear light source.

2. The system in accordance with claim 1 wherein said second plate member underlies said first plate member.

3. The system in accordance with claim 2 wherein said first and second plate light emergent surfaces are flat.

4. The system in accordance with claim 1 wherein said housing includes means thereon extending longitudinally and blocking approximately half said linear light source.

5. The system in accordance with claim 4 wherein said mentioned means comprises a track which supports said refractor.

6. The system in accordance with claim 5 wherein said track is set upward from said housing open bottom end and said housing further includes a front surface which extends below said track whereby said front surface effectively blocks from view said refractor when supported on said track.