04429355 is referenced by 15 patents and cites 9 patents.

The luminaire raising and lowering system includes a mast head in which a plurality of sets of pulleys are located. A carrier ring containing a number of lighting fixtures is suspended from the top head mast by a plurality of cables associated with respective ones of said sets of pulleys. Those cables are connected to a main winch cable through intermediate linkage means which compensate for differences in the length of said plurality of cables and enable the carrier effectively to "float". Means are also provided to monitor the tension on the main winch cable thereby preventing accidents due to undue slackness of the main winch cable or mispositioning of the same on the winch reel. Four cable and three cable systems are disclosed. Novel latching means are provided to take the load off of the suspension cables when the carrier is at the top of the pole in normal use.

Title
Luminaire raising and lowering system
Application Number
723099
Publication Number
4429355
Application Date
October 8, 1980
Publication Date
January 31, 1984
Inventor
John S Garchinsky
Aldan
PA, US
Agent
Frease & Bishop
Assignee
Union Metal Manufacturing Company
OH, US
IPC
F21V 21/36
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