Hollow bicycle crankshaft

Machine element or mechanism – Elements – Cranks and pedals

Patent

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Details

403370, 4033744, G05G 114

Patent

active

059243368

ABSTRACT:
A hollow bicycle crankshaft includes a hollow shaft assembly having a first shaft member fastened to a second shaft member, a hollow left crank arm, a hollow right crank arm, a tubular housing member, a first shaft bearing, a second shaft bearing, and a sprocket bracket. The first shaft member matingly engages the second shaft member. Non-mating ends of the shaft assembly are attached to respective hollow crank arms, where the shaft extends through an aperture in each arm. The union of the first and second shaft members is proximate the midsection of the constructed shaft assembly. The shaft assembly is housed within the tubular housing member. The first and second shaft bearings, disposed at each end of the housing member, secure the tubular housing member about the shaft assembly in coaxial and concentric alignment. The first shaft bearing is disposed at the end of the housing member that is adjacent to the sprocket bracket, and is larger than the second shaft bearing which is disposed on the opposing side of the housing member.

REFERENCES:
patent: 278972 (1883-06-01), Kimball
patent: 648077 (1900-04-01), Ludlow
patent: 1398883 (1921-11-01), Mottlau
patent: 4358967 (1982-11-01), Kastan
patent: 4651590 (1987-03-01), Thun
patent: 4704919 (1987-11-01), Durham
patent: 4816009 (1989-03-01), Philipp
patent: 5201242 (1993-04-01), Chi

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