Machine element or mechanism – Elements – Cranks and pedals
Reexamination Certificate
2001-12-07
2003-05-27
Luong, Vinh T. (Department: 3682)
Machine element or mechanism
Elements
Cranks and pedals
C074S594200, C403S381000
Reexamination Certificate
active
06568296
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a crank arm quick release device of a bicycle, and more particularly to a crank arm quick release device of a bicycle, wherein the pedal may be mounted on and detached from the crank arm easily and quickly.
2. Description of the Related Art
A conventional combination of a crank arm
20
and a pedal
30
in accordance with the prior art is shown in FIG.
5
. The crank arm
20
has a free end formed with a screw bore
200
. The pedal
30
has one end protruded with a rotation shaft
31
which has a free end formed with a screw portion
32
that may be extended through a washer
33
, and may be screwed into the screw bore
200
of the crank arm
20
. The crank arm
20
and the screw portion
32
of the rotation shaft
31
of the pedal
30
of the left side and the right side may form a reverse screw design which may prevent detachment of the pedal
30
when the pedal is stepped.
However, the crank arm
20
and the pedal
30
are combined by a reverse screw design. Thus, if the user rotates the pedal
30
in the opposite direction, the screw bore
200
of the crank arm
20
is easily worn out due to the wrong direction of rotation. In addition, the user has to screw the screw portion
32
of the rotation shaft
31
of the pedal
30
in the screw bore
200
of the crank arm
20
, so that the assembly and disassembly thereof are inconvenient and slow.
SUMMARY OF THE INVENTION
The present invention has arisen to mitigate and/or obviate the disadvantage of the conventional combination of a crank arm and a pedal.
The primary objective of the present invention is to provide a crank arm quick release device of a bicycle, wherein the pedal may be mounted on and detached from the crank arm easily and quickly.
Another objective of the present invention is to provide a crank arm quick release device of a bicycle, which may be adapted to suit the pedal of a common bicycle, without having to make a new pedal, thereby saving cost of fabrication.
In accordance with the present invention, there is provided a crank arm quick release device of a bicycle, comprising:
a pedal, having one end protruded with a rotation shaft which has a free end formed with a screw portion having an outer thread;
a fixing threaded sleeve, having a center formed with a screw bore that may be screwed on the screw portion of the rotation shaft of the pedal, the fixing threaded sleeve having an outer wall protruded with two radially opposite locking flanges; and
a crank arm, having a free end formed with a mounting hole for insertion of the fixing threaded sleeve, the mounting hole of the crank arm being recessed with two insertion guide grooves for insertion of the two locking flanges of the fixing threaded sleeve, each of the two insertion guide grooves having one side formed with a locking recess which has a depth slightly greater than the thickness of the locking flange, and is communicated with the insertion guide groove, the locking recess of each of the two insertion guide grooves being distributed on a diameter of the mounting hole.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 626227 (1899-06-01), Gaylor
patent: 4373760 (1983-02-01), Durham
patent: 4446753 (1984-05-01), Nagano
patent: 5387047 (1995-02-01), Korpi
patent: 5586472 (1996-12-01), Lin
patent: 5934155 (1999-08-01), Lai
patent: 6199449 (2001-03-01), Harrington
Lin Shih Tsao
Luong Vinh T.
Rosenberg , Klein & Lee
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