Bicycle crank unit

Details Bicycle crank unit Bicycle crank unit

1978-01-17

1980-08-26

Scott, Samuel

Endless belt power transmission systems or components

Positive drive pulley or guide roll

With stationary support for pulley or guide roll

474160, F16H 900

Patent

active

042189314

ABSTRACT:
The invention provides a bicycle crank unit in which the chain wheel or chain wheels are eccentric with respect to the crank spindle and the crank spindle carries an externally toothed pinion to engage within an internal gear carried coaxially by the chain wheel. This provides a step down gearing between the pedal crank arms and chain wheel and enhances the mechanical advantage of the drive transmission.

REFERENCES:
patent: 453705 (1943-06-01), Lapeyre
patent: 542882 (1895-07-01), Fisher
patent: 591488 (1897-10-01), McMullin
patent: 1523676 (1925-01-01), Trussell
patent: 2187368 (1940-01-01), Todrys
patent: 3347112 (1967-10-01), Thun
patent: 3919898 (1975-11-01), Sugino

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