Scraper blade tensioning device

  • US 5,201,402 A
  • Filed: 08/24/1992
  • Issued: 04/13/1993
  • Est. Priority Date: 08/24/1992
  • Status: Expired due to Term
First Claim
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1. A tensioning device for adjusting the contacting force of a scraper blade on the surface of an endless conveyor belt mounted in a support structure, said tensioning device comprising a transverse shaft mounted for rotation about its axis in the support structure,a first adjustment collar designed to receive the elongated shaft and rotatable about the axis of said shaft, said first collar having a sequence of axially-directed apertures spaced circumferentially on a circle of a given radius concentric with the axis of the shaft;

  • a second adjustment collar fixed to the shaft adjacent said first collar, said second collar having a sequence of axially-directed apertures spaced circumferentially on a circle of the same radius concentric with the axis of the shaft;

    a locking pin adapted to engage in apertures of said first and second collars when said apertures are in registry;

    said axially-directed apertures of the first collar having a spacing different from the apertures on the second collar,said collars adapted to be rotated relative to one another in circumferential increments on said shaft axis to bring different apertures of said first and second collars into registry, said different spacing on the second collar allowing said registry when one of said collars is rotated a circumferential increment which is less than the minimum spacing between said apertures on either said first or said second collar; and

    a torsion bias mechanism fixed at one end to said support structure and fixed at the other end to said first collar to urge said first collar clockwise about said axis and through said locking pin to urge said second collar and shaft clockwise.

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