Bicycle crank and method for manufacturing same

Details Bicycle crank and method for manufacturing same Bicycle crank and method for manufacturing same

1997-12-19

2000-06-27

Battista, Mary Ann

Machine element or mechanism

Elements

Cranks and pedals

B62M 300

Patent

active

060792949

ABSTRACT:
A crank arm for a bicycle includes a crank arm body formed of a first material and a core formed of a second material disposed in the crank arm body. The second material has a specific gravity less than a specific gravity of the first material. The second material may be a porous material such as volcanic glass or some other lightweight material. In the method used to form the crank arm body, a core having a specific gravity lower than a specific gravity of the metal forming the outer portions of the crank arm is positioned in a casting mold so that a melt space is formed around the core. Molten metal is poured into the casting mold, and the molten metal is solidified to form a crank billet such that the core is integrally formed with the metal.

REFERENCES:
patent: 3106853 (1963-10-01), Herr et al.
patent: 4811626 (1989-03-01), Bezin
patent: 5125288 (1992-06-01), Amiet
patent: 5179873 (1993-01-01), Girvin
patent: 5197353 (1993-03-01), Trenerry et al.
patent: 5394769 (1995-03-01), Cropley
patent: 5509327 (1996-04-01), Cropley
patent: 5609070 (1997-03-01), Lin et al.
Patent Abstracts of Japan, vol. 7, No. 193, Aug. 24, 1983; for JP 58-093554 A (Arai), published Jun. 3, 1983.

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