Pedal mechanism for a human propulsion vehicle

Details Pedal mechanism for a human propulsion vehicle Pedal mechanism for a human propulsion vehicle

B - Operations, Transporting

62

M

B62M 3/04 (2006.01)

Patent

CA 2060801

ABSTRACT A pedal mechanism for a human propulsion vehicle such as a bicycle wherein the length of each of the pedal arm is increased during the power stroke and decreased during the return stroke of the rotation cycle. It comprises a pair of sun gears rigidly attached to the frame of the vehicle, each meshed to an adjacent planetary gear of identical diameter. A lever, radially projecting from each of the planetary gears, generate the alternative movement of the corresponding pedal arm. The levers also change the angular orientation of the pedal arms by moving them toward the power stroke zone, forcing the pedals arm to stay as long as possible in power stroke, thus giving the pedal mechanism no dead point. This pedal mechanism is very suitable for bicycle, especially mountain bicycles and racing bicycles where high power and efficiency are crucial.

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