Illumination – Light source and modifier – Adjustable or repositionable modifier
362 33, 362230, 362232, 362250, 362285, 362286, 362293, 362308, 362309, 362319, 362372, 362418, 362449, 362455, 362804, F21V 900
The light comprises a cluster of lamp unts (100), pivotally mounted at (6,7), on respective chassis (8) running on a loop track. The lamp units are approximately equidistant from a central axis and illuminate a common patch on the axis. Each chassis (8) is connected to a respective chain (35) which may be driven to move individual chassis (8) along the track, changing the configuration of the cluster. A linkage (26,27,31) enables the lamp unit inclination to be varied and a linkage (12,13,14,16,18 ) enables the relative positions of a bulb (1) and a concave reflector (10) to vary, thereby varying the beam width. The rollers (18) of each unit roll on a surface of a first common hoop and the rollers (31) on a surface of a second common hoop. The hoops are movable enabling the inclination of beamwidth of all the lamp units to be varied simultaneously, changing the patch range or size.
patent: 4462067 (1984-07-01), Altman
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