Bicycle crank arm and method of making same

Details Bicycle crank arm and method of making same Bicycle crank arm and method of making same

2000-11-22

2003-01-21

Vidovich, Gregory M. (Department: 3726)

Metal working

Method of mechanical manufacture

Structural member making

C029S527500, C029S527700, C164S098000

Reexamination Certificate

active

06508002

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to a bicycle crank arm, and more particularly to an integrally-made bicycle crank arm and a method for making integrally the bicycle crank arm.
BACKGROUND OF THE INVENTION
The U.S. Pat. No. 5,979,923 of the same applicant has disclosed a bicycle crank arm which is formed of a hollow crank body, a head portion fastened to one end of the hollow crank body, and a pedal hole portion fastened to other end of the hollow crank body. The head portion and the pedal hole portion are fastened with the hollow crank body by soldering and riveting.
Such a prior art bicycle crank arm as described above is neither cost-effective nor durable in view of the fact that the process of fastening the head portion and the pedal hole portion with the hollow crank body is rather time-consuming, and that the head portion and the pedal hole portion are apt to break away from the hollow crank body.
SUMMARY OF THE INVENTION
It is the primary objective of the present invention to provide a bicycle crank arm which is made integrally and is provided with an elongated cavity.
It is another objective of the present invention to provide a method for making integrally a bicycle crank arm.
The features and the advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.


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