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Apparatus and method for moving rig structures

  • US 5,492,436 A
  • Filed: 04/14/1994
  • Issued: 02/20/1996
  • Est. Priority Date: 04/14/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for moving a structure on surface comprising:

  • a load bearing roller assembly for supporting a structure, said roller assembly having a fixed central core;

    a plurality of rollers connected together by an endless chain disposed about said central core;

    a motor having a drive shaft and a means to selectively energize said motor; and

    a worm gear coupled to said motor shaft, said worm gear meshes with and engages the endless chain, to transmit the rotation of the drive shaft to the endless chain thereby causing the endless chain to rotate about said central core and thereby translating said structure across a surface.

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