Bicycle crankshaft assembly

Details Bicycle crankshaft assembly Bicycle crankshaft assembly

2000-05-09

2003-04-22

Bucci, David A. (Department: 3682)

Machine element or mechanism

Elements

Cranks and pedals

C384S545000

Reexamination Certificate

active

06550355

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a crankshaft, and more particularly to a bicycle crankshaft assembly in which a crankshaft is properly supported by a shockproof ring within a frame tube.
DESCRIPTION OF THE PRIOR ART
As shown in
FIG. 1
, a bicycle crank axle set
1
A of the prior art comprises an axle
2
A, a sleeve
3
A fastened with one end of the axle
2
A, and a threaded casing
4
A fastened with the other end of the axle
2
A. The crank axle set
1
A is fastened with a bicycle frame tube
5
A which is provided in one end with inner threads
6
A, and in other end with inner threads
7
A. The threaded casing
4
A is made by punching and therefore is not cost-effective. The bicycle frame tube
5
A is provided in both ends thereof with inner threads
6
A and
7
A, which are also not cost-effective. In addition to the high production cost of the crank axle set
1
A and the frame tube
5
A, the fastening of the crank axle set
1
A with the frame tube
5
A is not reliable in view of the fact that the fastening mechanism is attained by the threads, which are susceptible to wear or damage. As a result, the axle
2
A of the bicycle axle set
1
A is apt to become loose.
SUMMARY OF THE INVENTION
It is an objective of this invention to provide a bicycle crankshaft assembly configured by simple but reliable structure.
In order to achieve the objective set forth, a bicycle crankshaft assembly in accordance with the present invention comprises a frame tube having first and second end portions and defining a passage extending between the end portions. The first end portion define a first opening, and the second end portion define a second opening different to the first opening. An axle is securely assembled into the passage from the second end portion and the axle includes a bushing with a crankshaft rotationally supported therein. The crankshaft includes first and second coupling portions extending over the first and second openings of the first and second end portions of the frame tube. Wherein the first opening is dimensioned such that a first end of the bushing is limited from extending therethrough.
The features of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of a preferred embodiment of the present invention with reference to the accompanying drawings.


REFERENCES:
patent: 5437510 (1995-08-01), Jeng
patent: 5473962 (1995-12-01), Yamamoto
patent: 5572909 (1996-11-01), Chi
patent: 5634727 (1997-06-01), Lin et al.
patent: 6024662 (2000-02-01), Fujimoto

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