Driven variable pitch pulley

Claim 1

A VARIABLE PITCH PULLEY COMPRISING: A POWER TRANSMITTING MEMBER FOR CONNECTION TO A DEVICE TO BE DRIVEN BY THE PULLEY, SAID MEMBER HAVING A FIRST PULLEY FACE THEREON WITH AN AXIS OF SYMMETRY; AN INTERMEDIATE MEMBER MOUNTED ON SAID TRANSMITTING MEMBER AND HAVING A SECOND PULLEY FACE THEREON COAXIAL WITH AND FACING SAID FIRST FACE, SAID INTERMEDIATE MEMBER BEING AXIALLY MOVABLE ON SAID TRANSMITTING MEMBER TO VARY THE SPACING BETWEEN SAID FACES AND THEREBY VARY THE PITCH DIAMETER OF SAID PULLEY, SAID INTERMEDIATE MEMBER HAVING A FIRST SURFACE THEREON FACING IN A DIRECTION OPPOSITE THE FACING DIRECTION OF SAID SECOND PULLEY FACE; A SHOULDER MEMBER ON SAID TRANSMITTING MEMBER AND HAVING A SECOND SURFACE THEREON FACING SAID FIRST SURFACE, ONE OF SAID SURFACES BEING A CAM SURFACE; AND RESILIENT GARTER MEANS RECEIVED BETWEEN SAID SURFACES AND ENGAGING SAID SURFACES TO BIAS SAID SECOND PULLEY FACE TOWARD SAID FIRST PULLEY FACE, SAID CAM SURFACE HAVING A SLOPE WHICH INCREASES AT DECREASING RADIAL DISTANCES FROM THE SAID AXIS TO INCREASE THE FORCE OF SAID BIAS AS SPACING BETWEEN SAID PULLEY FACES DECREASES AND DECREASE TENSION IN SAID RESILIENT GARTER MEANS AS SPACING BETWEEN SAID PULLEY FACES DECREASES.