Bicycle crank assembly

Details Bicycle crank assembly Bicycle crank assembly

1989-12-04

1990-10-02

Luong, Vinh T.

Machine element or mechanism

Elements

Cranks and pedals

745942, G05G 114

Patent

active

049600133

ABSTRACT:
A bicycle foot pedal crank arm construction that provides a relatively long lever arm between the foot pedal and crank arm rotational axis during the power stroke; during the return stroke (upstroke) the lever arm distance is shortened. Anti-friction rollers are provided between each hollow crank arm and each associated crank arm extension to guide the extension in and out on the crank arm, with minimum tendency to wobble or bind.

REFERENCES:
patent: 550206 (1895-11-01), Tompkins
patent: 590557 (1897-09-01), Wilkinson
patent: 610175 (1898-09-01), Flindall
patent: 935435 (1909-09-01), Grout
patent: 4519271 (1985-05-01), Chattin
patent: 4706516 (1987-11-01), Xi
patent: 4807491 (1989-02-01), Stuckenbrok

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