Bicycle drive assembly

Details Bicycle drive assembly Bicycle drive assembly

1975-09-17

1977-06-14

Peters, Jr., Joseph F.

Land vehicles

Wheeled

Occupant propelled type

74 36, 74 68, 74569, 280257, B62M 102

Patent

active

040293343

ABSTRACT:
A drive assembly for a physically propelled vehicle such as a bicycle having a crank arm operatively connected to a drive member for rotating the drive member, and a power arm rotatively mounted for relative angular movement between the power arm and crank arm. A control mechanism interconnects the power arm and the crank arm for rotating the crank arm and drive member, and for accelerating the power arm ahead of the crank arm during one portion of the crank arm cycle and decelerating the power arm behind the crank arm during another portion of the crank arm cycle. More particularly, the control mechanism includes a cam surface provided on either the crank arm or power arm, and a cam element having a shaft rotatively mounted on the other of the arms and having a spaced cam follower engaging the cam surface. The pedal mechanism is operatively connected to the cam element to cause relative rotation of the cam element and the arm to which the cam shaft is rotatively mounted to regulate movement of the cam follower on the cam surface during rotation of the crank arm and power arm.

REFERENCES:
patent: 619498 (1899-02-01), Pedersen
patent: 3375022 (1968-03-01), Hatian
patent: 3418858 (1968-12-01), Minnich

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