Importance

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Abstract

The invention is a crank assembly designed to allow the length of the crank arms to vary throughout the revolution of the crank. A spindle is attached to the bottom bracket assembly of a bicycle. The spindle is comprised of a cylindrical shaft with a mating feature at each end. A first crank arm assembly is attached to the spindle's left mating feature. The left crank arm assembly includes the crank arm, slider assembly, bearing, track, and pedal. Next, a second crank arm assembly is attached to the spindle's right mating feature. The right crank arm assembly includes the chain ring base, bearing, track, crank arm, slider assembly, pedal, and chain ring. Finally, the trajectory of the pedals in this invention follows a unique curve designed to allow the optimum expansion and contraction of the crank arms coinciding with the optimum amount of torque and angular speed.

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First Claim