Variable crank pedal drive for bicycles and the like

Details Variable crank pedal drive for bicycles and the like Variable crank pedal drive for bicycles and the like

1989-06-13

1991-11-26

Luong, Vinh T.

Machine element or mechanism

Elements

Cranks and pedals

745943, 474 63, 474152, G05G 114

Patent

active

050673700

ABSTRACT:
A drive system for driving any driven device, such as the rear wheel of a bicycle or the like, comprising a pair of oppositely-directed input torque crank arms supported for independent rotation about a first axis, an output torque member supported for rotation about a second axis parallel to and spaced from the first axis, and torque transferring linkages connecting both crank arms to the output torque member. The angular orientation of the plane containing the two axes adjustable and the amount of eccentricity may be fixed or adjustable. The arrangement is such that for a constant speed of the output member, each input crank arm will undergo a single speed variation per revolution. Typically, from its top dead center position to its bottom dead center position, the angular velocity of each crank arm decreases and then increases in the second half-turn.

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