Illumination – Light source and modifier – Adjustable or repositionable modifier
Patent
1979-06-12
1982-06-29
Lechert, Jr., Stephen J.
Illumination
Light source and modifier
Adjustable or repositionable modifier
362290, 362292, 362300, 362302, 362346, 362347, 362367, F21V 700
Patent
active
043375073
ABSTRACT:
In a lighting fixture, a light source is partially surrounded by a reflector system mounted in a housing to direct light from the light source out through an aperture in the front of the housing. The reflector is cylindrically and parabolically shaped to provide a cut-off above a selected vertical angle and to provide a decreasing intensity with decreasing vertical angles from a maximum intensity to effect uniform distribution. A lens is provided in the aperture to achieve uniform distribution through a wide horizontal angle. The reflector system and the light source are pivotable within the housing about a fixed horizontal axis to adjust the vertical cut-off angle and the angle of the maximum intensity. A fixed reflector is mounted near the top of the aperture on the front wall of the housing to get more sideways distribution of the light when the light source is pivoted toward the back of the housing. The lens is provided with vertically extending ribs to achieve horizontal distribution without effecting the vertical distribution or vertical cut-off characteristics achieved by the reflector system.
REFERENCES:
patent: 3358133 (1967-12-01), Thoman et al.
patent: 3610915 (1971-10-01), Moore
patent: 3697893 (1972-10-01), Faustlin et al.
patent: 4096555 (1978-06-01), Lasker
Rambusch Lighting, Catalogue No. U-88, p. 1R-1, 1977.
A Catalog to Lighting Instruments, Elliptipar, Section A-1 to Z-7, Jan. 1977.
Lechert Jr. Stephen J.
The Marley-Wylain Company
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