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Crowd rope take-up system for mining shovel

  • US 6,168,542 B1
  • Filed: 02/12/1999
  • Issued: 01/02/2001
  • Est. Priority Date: 02/12/1999
  • Status: Expired due to Term
First Claim
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1. A mechanism for adjusting the length of a continuous loop crowd rope for extending and retracting a handle supported on a boom and carrying a dipper, comprising:

  • a cylinder slidably mountable at the rear end of the handle remote from the dipper, and having external screw threads;

    a sheave mounted on the end of the cylinder and engageable with a loop of the crowd rope;

    a nut wheel rotatable mounted to said cylinder, and having internal screw threads meshing with the screw threads of the cylinder and having external gear teeth; and

    a worm gear engaging the teeth of the nut wheel to rotate the nut wheel and thereby adjust the position of the sheave to take up slack in the crowd rope.

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