Patent ID: 6905432
Filing Date: 2005-06-14
Classification: B66D,Y10T

Abstract:
1. In a chain drive having a rotatable chain wheel with pockets or teeth connected by straight lines to form a polygon for driving pivot chains or round link chains, the axis of said chain wheel rotatably fixed to a driven gear wheel of a spur gear driving arrangement, said driven gear wheel having a variably sized pitch circle for reducing variations in velocity and acceleration of said chain wheel, the improvement comprising: said spur gear driving arrangement including a driving gear wheel for driving said driven gear wheel at an adjusted gear ratio, said chain wheel and said drive gear rotatable on a common axis; and at least one of said driving and driven gear wheels having a noncircular toothed gear wheel configuration established relative to the pitch circle and including a plurality of rolling curve means for causing said chain wheel to have a minimum angular velocity at a corner of said polygon and a maximum velocity at a mid-point of a straight side of said polygon while said driving wheel rotates at a constant angular velocity.