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Variable speed pulley

  • US 4,789,378 A
  • Filed: 06/29/1987
  • Issued: 12/06/1988
  • Est. Priority Date: 06/30/1986
  • Status: Expired due to Fees
First Claim
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1. A variable speed pulley comprising:

  • a first sheave half;

    means for fixedly mounting the first sheave half on a rotatable shaft defining an axis of rotation;

    a second sheave half;

    means for coaxially movably mounting said second sheave half on said shaft adjacent said first sheave half to define a belt receiving groove therebetween;

    biasing means for biasing said second sheave half axially of the shaft to vary the width of said belt receiving groove; and

    urging means for urging said second sheave half axially of the shaft against the biasing force of said biasing means with a force proportional to the speed of rotation of said shaft to vary the width of said belt receiving groove, said urging means comprisingmeans movable with said second sheave half defining a fixed surface,means fixedly associated with said shaft defining a fixed surface,force applying means extending between said movable surface and said movable surface and having a variable extension parallel to said shaft axis proportional to the centrifugal force acting thereon as a result of said speed of rotation of the shaft, andrearrangement means for varying the arrangement of said force applying means as an incident of a relative movement between said first and second sheave halves angularly about said axis of rotation.

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