Illumination – Supports – Support having gravity-type light source or light modifier...
Patent
1977-03-31
1978-09-19
Miller, J D
Illumination
Supports
Support having gravity-type light source or light modifier...
362431, 248320, F21V 2114, B42F 1300
Patent
active
041158458
ABSTRACT:
A high mast lighting structure including a hollow mast and a light and reflector or illumination assembly adapted to be raised to the top of the mast by operation of a hoisting cable secured to the assembly. A plurality of latch-type locking and support means are positioned between the illumination assembly and a support plate secured at the top of the mast. Each locking and support means includes a first member mounted to the illumination assembly and comprising a pair of generally planar, oppositely facing spring-loaded bracket or jaw portions which normally rest in substantially parallel position. A second member of each locking and support means comprises a bayonet-like projection having outstanding cam surfaces; the second members are mounted to to the support plate. The said members of the locking and support means are arranged for respective cooperative engagement when the illumination assembly is raised to the top of the mast such that the projection of the second member engages between the jaws of the first member and the cam surfaces spread the jaws; the jaws pass over the cam surfaces and thereafter snap back to rest position to be locked upon the projection thereby to maintain the illumination assembly securely at the top of the mast. The locking members are releasable by raising the illumination assembly a short distance beyond the locking position attained; upon raising the assembly, each projection spreads the jaws of its associated first member to permit a pivotal bar or arm to drop across the jaws and temporarily maintain the same in open position whereby the assembly is released for lowering. As the projection moves away from the jaws during lowering of the assembly, a release finger on the projection disengages the arm and the jaws snap back to rest or re-set position.
REFERENCES:
patent: 357943 (1887-02-01), Stamm
patent: 468040 (1892-02-01), Didion
patent: 2793891 (1957-05-01), Frye
patent: 3673403 (1972-06-01), Woods
Kapcoa Corp.
Miller J D
Wong Peter S.
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