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US4298921: Lamp

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Filing Information

Inventor(s) Jens C. Krogsrud · Kai O. Soerensen ·
Assignee(s) Jac. Jacobsen A/S ·
Attorney/Agent(s) Harold L. Stults ·
Primary Examiner Donald P. Walsh ·
Application Number US6087482
Filing date 10/23/1979
Issue date 11/03/1981
Predicted expiration date 10/23/1999
U.S. Classifications 362/346  · 362/269  ·
International Classifications F21V 700  ·
Kind CodeA
International Classifications 362269;275;285;371;413;418;427;430;804;297;346;347;348 ·
Foreign Priority NO783593 - 10/24/1978 ·
11 Claims, No Drawings


Abstract

An electric lamp which provides substantially uniform lighting throughout a work area. The area extends from directly under the lamp a substantial distance beyond the shade. A faceted reflector provides the desired distribution of the light.

Independent Claims | See all claims (11)

  1. 1. In a lamp structure, the combination of, a lamp head assembly which is adapted to be supported in a position over a work area and provide substantially uniform lighting with the light being directed from a generally horizontally extending zone, and support means for said lamp head, said lamp head comprising a shade which is generally circular in plan, a reflector assembly mounted in said shade, and light source means, said shade and support means having mating rotatably engaged portions, said mating portions of said shade and said support means being eccentrically located with respect to said shade, said shade having an opening therethrough at said mating portions and said light source means comprising a lamp bulb mounted in a socket in said support means above said central opening and extending therethrough to a position within said reflector assembly, said reflector assembly having a plurality of flat faceted reflecting surfaces located at predetermined angles with respect to each other and to said bulb to reflect light from said bulb evenly over said area in an oval pattern extending from directly beneath the lamp shade to a position which is a substantial distance away from the shade; said faceted surfaces of the shade defining three groups of facets including a first group of polygonal facets extending from positions adjacent said shade opening downwardly away from said opening towards the peripheral edge of the shade remote from said opening and at a transverse angle to each other, a second group comprising a single facet lying in a plane parallel to the plane of said opening partially surrounding said opening and extending away therefrom in a direction opposite to said first group of facets, and a third group of flat polygonal facets spaced from said opening and extending downwardly at slight angles to the vertical; said third group of facets being located on the side of said opening opposite said first group of facets with at least some of said facets in the third group extending to the side of the opening on which the first group is located.
  2. 4. In a lamp structure, the combination of, a lamp head which is adapted to be supported in a position over a work area and provide substantially uniform lighting with the light being directed from a generally horizontally extending zone, and support means for said lamp head, said lamp head comprising a shade which is generally circular in plan, a reflector assembly mounted in said shade, and light source means, with light emitting means positioned within the horizontal zone of said assembly, said shade and support means having mating rotatably engaged portions, said mating portions of said shade and said support means being eccentrically located with respect to said shade, said shade having an opening therethrough at said mating portions and said light source means comprising a lamp bulb mounted in a socket in said support means above said central opening and extending therethrough to a position within said reflector assembly said reflector assembly having a plurality of flat faceted reflecting surfaces located at predetermined angles with respect to each other and of predetermined sizes and shapes and positions with respect to said light-transmitting means by which light is reflected therefrom and distributed substantially evenly over said area in an oval pattern extending from directly beneath the lamp shade to a position which is a substantial distance away from the shade; said faceted surfaces of the shade defining three groups of facets including a first group of polygonal facets extending from positions adjacent said shade opening downwardly away from said opening towards the peripheral edge of the shade remote from said opening and at a transverse angle to each other, a second group comprising a single facet lying in a plane parallel to the plane of said opening partially surrounding said opening and extending away therefrom in a direction opposite to said first group of facets, and a third group of flat polygonal facets spaced from said opening and extending downwardly at slight angles to the vertical; said third group of facets being located on the side of said opening opposite said first group of facets with at least some of said facets in the third group extending to the side of the opening on which the first group is located.
  3. 10. In a lamp construction, the combination of a lamp bulb, a shade and reflector assembly, means mounting said lamp bulb and said shade and reflector assembly with a common vertical axis adjacent one edge of said shade and reflector assembly which permits said shade and reflector assembly to turn about said axis, said shade and reflector assembly including a top wall and a reflector positioned with its outer periphery mating with and fixed to said top wall, said reflector having a plurality of facet surfaces each of which is substantially flat and which reflects the light in the vicinity of said axis downwardly in a controlled pattern to produce substantially uniform lighting throughout a work area beneath said reflector which extends from an area substantially directly below the edge of said reflector adjacent said axis to an area substantially beyond a position directly below the opposite edge of said reflector, said facet surfaces including a first group of polygonal facet surfaces extending from positions adjacent said axis downwardly and away from said axis toward the peripheral edge of said shade remote from said axis and at transverse angles to each other, and a second group comprising a single facet surface substantially transverse to said axis, and a third group comprising four facet surfaces substantially upon the side of said bulb opposite the respective facet surfaces of said first group and extending downwardly at acute angles to said axis, and a fourth group of facet surfaces which extend downwardly and away from each other upon the opposite sides of said first group of facet surfaces.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
USRE24258 Burliuk Dec 1956
US2913570 Gough Nov 1959
US3476925 HUBBELL INC HARVEY Adra Nov 1969
US3700882 Planchon Oct 1972