Luminaire ring lowering mechanism

Claim 2

In an apparatus for raising and lowering a luminaire ring on a pole shaft, the combination including: a continuous loop drive chain positioned within a pole shaft, said continuous loop drive chain extending approximately the entire length of said pole shaft; a transition plate fixedly attached and enclosing said continuous loop chain so as to selectively move upwardly and downwardly in response to corresponding movement of said drive chain; suspension cable means connected at one end to said transition plate, said suspension cable means extending upwardly within said pole shaft to the exterior thereof; a luminaire ring attached to the opposite ends of said suspension cable means on the exterior of said pole shaft, said luminaire ring being selectively raised and lowered along said pole shaft in response to corresponding movement of said suspension cable means.

Claim 3

In the apparatus of claim 1 wherein motor drive means are provided to selectively drive said continuous loop drive chain in either direction.

Claim 4

In the apparatus of claim 1 wherein said transition plate adapted to attachably retain the end of said suspension cable means under spring tension.

Claim 5

In the apparatus of claim 1 wherein limit switch means are provided to control the amount of travel of the continuous loop drive chain in either direction.

Claim 6

In the apparatus of claim 1 wherein a fixed head assembly is provided at the top of the pole shaft, said fixed head assembly provided with radially extending support arms each having a pair of sheaves which movably support said suspension cable means thereover.

Claim 7

In the apparatus of claim 5 wherein a conductor cable is connected to a power box provided on said luminaire ring, said conductor cable adapted to pass over a conductor cable sheave provided on said fixed head assembly so as to extend downwardly into fixed engagement with said transition plate.

Claim 8

In the apparatus of claim 2 wherein a worm gear reducer assembly is provided intermediate said continuous loop drive chain and said motor drive means.

Claim 9

In the apparatus of claim 7 wherein portable motor drive means are provided having a dagger anchor positioning plate which is adapted to engage an anchor plate positioning bracket provided on the pole shaft.

Claim 10

In an apparatus for raising and lowering a luminaire ring on a pole shaft, the combination including: a continuous loop drive chain positioned within a pole shaft, said continuous loop drive chain extending approximately the entire length of said pole shaft; a transition plate fixedly provided on said continuous loop drive chain so as to selectively move upwardly and downwardly within said pole shaft in response to corresponding movement of said drive chain; suspension cable means connected at one end to said transition plate, said suspension cable means extending upwardly within said pole shaft to the exterior thereof; a luminaire ring attached to the opposite ends of said suspension cable means on the exterior of said pole shaft, said luminaire ring being selectively raised and lowered along said pole shaft in response to corresponding movement of said suspension cable means; and a U-shaped extension member is provided on said transition plate, said U-shaped extension member adapted to freely receive a safety cable therethrough which extends the length of the pole shaft, said U-shaped extension member having a pivotally mounted spring biased normally open braking arm provided thereon, said braking arm adapted to clampably engage said safety cable upon failure of said continuous loop drive chain.

Claim 11

In an apparatus for raising and lowering a luminaire ring on a pole shaft, the combination including: a continuous loop drive chain positioned within a pole shaft, said continuous loop drive chain extending approximately the entire length of said pole shaft; a transition plate fixedly provided on said continuous loop drive chain so as to selectively move upwardly and downwardly within said pole shaft in response to corresponding movement of said drive chain; suspension cable means connected at one end to said transition plate, said suspension cable means extending upwardly within said pole shaft to the exterior thereof; a luminaire ring attached to the opposite ends of said suspension cable means on the exterior of said pole shaft, said luminaire ring being selectively raised and lowered along said pole shaft in response to corresponding movement of said suspension cable means; and a U-shaped extension member is provided on said transition plate, said U-shaped extension member adapted to freely receive a safety cable therethrough which extends the length of the pole shaft, said U-shaped extension member having a pivotally mounted spring biased normally open braking arm provided thereon, said braking arm adapted to clampably engage said safety cable upon failure of said continuous loop drive chain.