Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
1999-11-03
2001-06-12
Hannon, Thomas R. (Department: 3682)
Bearings
Rotary bearing
Antifriction bearing
C384S458000, C384S540000
Reexamination Certificate
active
06244750
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a bicycle crank axle, and more particularly to a bicycle crank axle, which can be easily assembled with precision.
BACKGROUND OF THE INVENTION
FIG. 1
shows a schematic view of a bicycle crank axle
10
which is disclosed by this inventor of the present invention in the U.S. Pat. No. 5,549,396. The bicycle crank axle
10
is provided at both ends thereof with a tapered sleeve
20
, and a tapered bearing
30
which is fitted over the tapered sleeve
20
and is engaged with a tapered fixation seat
31
.
Such a bicycle crank axle
10
as prior art described above is susceptible to idle running in view of the tapered bearings
30
which do not work well with the steel balls or the non-tapered frame tube. In addition, the crank axle
10
is vulnerable to wear.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a bicycle crank axle which is free from the deficiencies of the prior art bicycle crank axle described above.
In keeping with the principle of the present invention, the forgoing objective of the present invention is attained by a bicycle crank having two fitting portions located respectively at both ends thereof. The two fitting portions are provided with a tapered sleeve, which is provided at the small diametrical end thereof with a fixation seat, and at the large diametrical end thereof with a tapered ring and an oil seal. The fixation seat is provided therein with a tapered fixation ring, a tapered bearing seat, a C-shaped ring, a rolling pillar holder of a tapered construction, a plurality of rolling pillars of a tapered construction, a washer, and a cover. The fixation seat prevents the idle running and the mechanical wear of the bicycle crank axle.
The foregoing objective, features, functions, and advantages 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: 5405202 (1995-04-01), Chi
patent: 5549396 (1996-08-01), Chiang
patent: 5572909 (1996-11-01), Chi
patent: 6139192 (2000-10-01), Chiang
Bacon & Thomas PLLC
Hannon Thomas R.
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