Patent ID: 8272988

Claim:
A bicycle propulsion system with bidirectional input and one-way output, said bicycle propulsion system including a torque limited retrograde transmission device that enables a bicycle to be move backwards without being locking, comprising: a human input device for receiving a bidirectional input and transmitting said bidirectional input to said torque limited retrograde transmission, said bidirectional input including inputs in either of two rotary input directions or a reciprocating input; and a load wheel set driven by said one-way output of said torque limited retrograde transmission, wherein: said torque limited retrograde transmission device converts said bidirectional input into a one-way output to cause said bicycle to move in a forward direction, thereby allowing a rider to move the bicycle in a forward direction while supplying an input in either of the two rotary input directions, and said torque limited retrograde transmission device includes a torque limiting component arranged to transfer said torque limited retrograde transmission to a sliding or disengaged status to prevent locking when a reverse torque from reverse movement of the load wheel set exceeds a set overload torque.