US 4,228,488 AGranted

Luminaire raising and lowering system

AssigneeGar Design Research, Inc.

InventorJohn S. Garchinsky

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Abstract

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.

Claims9

Dependent claims

A system for raising and lowering luminaires or the like from the tops of poles comprising:

(a) support means toward the top of said poles including a plurality of pulleys,
(b) a carrier normally disposed adjacent said support means, said carrier including a plurality of luminaires or the like and being suspended from said support means by a plurality of high tensile strength elongated means respectively associated with selected ones of said pulleys and having first ends thereof connected to said carrier,
(c) linkage means connected to the respective other ends of said plurality of high tensile strength means, and
(d) a single high tensile strength elongated means connected to said linkage means, the effective points of connection of all of said elongated means being disposed substantially in a common plane, said single high tensile strength elongated means being adapted to be connected to means for raising and lowering said single high tensile strength elongated means.

1 more element

Dependencies are inferred from the claim text.