Method of manufacturing hollow bicycle crank arm

Details Method of manufacturing hollow bicycle crank arm Method of manufacturing hollow bicycle crank arm

1999-06-22

2000-11-14

Batten, Jr., J. Reed

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

29557, 298972, 164132, B21D 5388

Patent

active

061451843

ABSTRACT:
In a method of manufacturing a hollow bicycle crank arm, a sand mold core is positioned into a casting mold so that a melt space is formed around the sand mold core, molten metal is poured into the casting mold, and the molten metal is solidified to form a crank billet. Sand is preferably removed through an opening in the crank billet. This may be accomplished by drilling the crank billet to form the pedal attachment hole in a location that communicates with the sand mold and then removing sand through the pedal attachment hole.

REFERENCES:
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: 5623856 (1997-04-01), Durham
patent: 5803151 (1998-09-01), Carden
Patent Abstracts of Japan, vol. 7, No. 193, Aug. 24, 1983; for JP 58-093554 A (Arai), published Jun. 3, 1983.
Translation of Japanese Patent Publication 5-116670 Published May 14, 1993.

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