Bottom bracket bearing axle mounting arrangement

Details Bottom bracket bearing axle mounting arrangement Bottom bracket bearing axle mounting arrangement

2001-03-13

2002-11-05

Butler, Douglas C. (Department: 3683)

Machine element or mechanism

Elements

Cranks and pedals

C384S540000, C384S545000

Reexamination Certificate

active

06474192

ABSTRACT:

BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to bicycles and, more specifically, to a bottom bracket bearing axle mounting arrangement for bicycle, which eliminates clearance of teeth, keeping the bottom bracket bearing axle stably supported in place.
A regular bicycle comprises a bottom bracket bearing axle mounted in a bottom bracket to hold two crank and pedal assemblies for pedaling.
FIG. 1
shows a bottom bracket bearing axle mounting arrangement according to the prior art. As illustrated in
FIG. 1
, a bottom bracket bearing axle
92
is inserted through a bottom bracket
91
, two ball races
93
are mounted on the bottom bracket bearing axle
92
inside the bottom bracket
91
, two sets of steel balls
94
are respectively supported on the ball races
93
around the periphery of the bottom bracket bearing axle
92
, two threaded stop members
95
respectively sleeved onto the bottom bracket bearing axle
92
and threaded into a respective inner thread at each of two opposite ends of the bottom bracket
91
to hold the two sets of steel balls
94
on the ball races
93
around the bottom bracket bearing axle
92
, and two locating rings
96
respectively fastened to the threaded stop members
95
outside the bottom bracket
91
. After installation, the two distal ends
922
of the bottom bracket bearing axle
92
are disposed outside the bottom bracket
91
for the mounting of the respective crank and pedal assemblies. This design of bottom bracket bearing axle mounting arrangement is still not satisfactory in function. Because there is a clearance of teeth between the outer thread of each threaded stop member and the respective inner thread of the bottom bracket, the steel balls are not stably supported on the respective ball races, and the bottom bracket bearing axle may vibrate when pedaling the pedals of the crank and pedal assemblies.
The present invention has been accomplished to provide a bottom bracket bearing axle mounting arrangement, which eliminates the aforesaid problem. According to the present invention, the stop members holding the respective sets of steel balls on the respective ball races are hollow, conical, externally threaded, split stop members. Because the stop members each have splits, the cross section of each stop member where the respective splits passed is radially compressible. Therefore, the stop members can be fastened to the respective inner threads of the bottom bracket tightly to hold the respective sets of steel balls on the respective ball races stably, and no clearance of teeth is left between the outer thread of each stop member and the corresponding inner thread of the bottom bracket after installation of the stop members in the bottom bracket.


REFERENCES:
patent: 5437510 (1995-08-01), Jeng
patent: 5572909 (1996-11-01), Chi
patent: 23902 (1896-10-01), None

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