Patent ID: 8257209

Claim:
A variable gear ratio transmission, comprising: a first disc system and a second disc system operatively interconnected by a conveyance having a slack take-up device, said conveyance either engages at least one concentric ring of headed moveable pins or engages a concentric ring of barrel only pins on each of said first and second disc system; said first and said second disc system each further comprising a pin-actuating structure at an outermost side, a pin-receiving disc at an innermost side, and a pin-retention disc sandwiched there between said pin-actuating structure and said pin-receiving disc, said pin-retention disc further being fastened to said pin-receiving disc in a manner forming a slot there between; said barrel only pins spanning said slot between said pin-receiving disc and said pin-retention disc at an innermost row of blind holes formed by said pin-receiving disc and said pin-retention disc, respectively; and a plurality of retaining devices in said pin-retention disc each corresponding to and for maintaining said moveable pins alternately in an engaged or disengaged position; wherein each said stationary pin-actuating structure further comprises a mechanical shift mechanism assembly having a plurality of moveable pin deflection ramps urged alternately by a single rotating cam shaft and plurality of resisting springs for controlling the movement of said moveable pin deflection ramps.