Bicycle crank assembly

Details Bicycle crank assembly Bicycle crank assembly

2007-08-21

2007-08-21

Johnson, Vicky A. (Department: 3682)

Machine element or mechanism

Elements

Cranks and pedals

Reexamination Certificate

active

10773243

ABSTRACT:
A bicycle crank assembly has a right crank crimp-fastened to a crank shaft in such a manner that the external appearance is attractive. The crank shaft has a first and second portions with the second portion being positioned on the right side of the first portion and having a larger diameter than the first portion. The right crank has a sprocket mounting part, a right crank arm part, and an engagement bore formed in the center of the sprocket mounting part. The right crank is crimp-fastened to the crank shaft by installing the second portion of the crank shaft into the engagement bore and pressing the periphery of the engagement bore toward the outside in the axial direction of the crank shaft such that the pressed portion bulges radially inward and an annular space is formed between the crank shaft and the engagement bore.

REFERENCES:
patent: 4300411 (1981-11-01), Segawa
patent: 5480359 (1996-01-01), Tani
patent: 5988016 (1999-11-01), Yamanaka
patent: 1 059 123 (2000-12-01), None
patent: 51-6653 (1976-01-01), None
patent: 51-6654 (1976-01-01), None
patent: 51-007855 (1976-01-01), None
patent: 51-7856 (1976-01-01), None
patent: 53-1708 (1978-01-01), None

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