Patent ID: 7367277
Filing Date: 2008-05-06
Classification: B63H,B66D

Abstract:
1. A pulley comprising a first pulley wheel and a second pulley wheel, the pulley including means acting between the two pulley wheels such that: when substantially equal force is applied to each pulley wheel in use on a rope tail side causing the pulley wheels to rotate, then a low gear ratio is achieved through a rope or chain acting on a load through a block; when one pulley wheel is prevented from rotating and a force is applied to the other pulley wheel in use on a rope tail side causing it to rotate, then a higher gear ratio is achieved through a rope or chain acting on a load through a block; and, when force is applied to the first wheel on a rope tail side and the second pulley wheel is allowed to rotate, then a still higher ratio is achieved in use through a rope or chain acting on a load through a block.