Resilient tires and wheels – Tires – resilient – Wheel securing means
Reexamination Certificate
1999-04-19
2001-04-17
Stormer, Russell D. (Department: 3617)
Resilient tires and wheels
Tires, resilient
Wheel securing means
C152S381400, C152S513000, C301S095110
Reexamination Certificate
active
06216758
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a bicycle wheel rim, more particularly to a bicycle wheel rim with resilient wear-resisting rings to minimize wearing of a tire.
BACKGROUND OF THE INVENTION
Referring to
FIG. 1
, a conventional bicycle wheel rim is shown to include an extruded metal rim body
1
having an annular spoke-mounting wall
11
with two annular lateral peripheral edges
110
for mounting a plurality of spokes
10
, and spaced left and right annular tire-retaining walls
12
which extend integrally, radially, outwardly and respectively from the lateral peripheral edges
110
of the spoke-mounting wall
11
. Each of the tire-retaining walls
12
has an inner surface
120
that faces the other one of the tire-retaining walls
12
to confine a tire receiving space
14
therewith, an outer brake pad contacting surface
121
opposite to the inner surface
120
, and an annular end face
122
that is distal to the spoke-mounting wall
11
. Each of the tire-retaining walls
12
further has a tire-retaining projection
123
formed at a corner of the end face
122
and the inner surface
120
. The tire-retaining projection
123
is adapted to engage a bicycle tire
13
so as to the retain the bicycle tire
13
between the tire-retaining walls
12
.
A disadvantage that results from the use of the conventional bicycle wheel rim resides in that the tire
13
will expand laterally and outwardly relative to the rim body
1
by virtue of the weight of the rider, thereby causing the tire
13
to abut frictionally against the end face
122
of the rim body
1
. The situation is aggravated during a braking operation, where the braking pads
16
clamp together the tire retaining walls
12
at the brake pad contacting surfaces
121
. As such, wearing and eventual rupturing of the tire
13
can easily occur when the conventional bicycle wheel rim is in use.
SUMMARY OF THE INVENTION
Therefore, the main object of this invention is to provide a bicycle wheel rim with resilient wear-resisting rings to minimize wearing of a tire.
Accordingly, a bicycle wheel rim of the present invention includes a rim body having an annular spoke-mounting wall and spaced left and right annular tire-retaining walls, and a pair of wear-resisting rings. The spoke-mounting wall has two annular lateral peripheral edges. The left and right annular tire-retaining walls extend integrally, radially, outwardly and respectively from the lateral peripheral edges of the spoke-mounting wall. Each of the tire-retaining walls has an inner surface that faces the other one of the tire-retaining walls to confine a tire receiving space therewith, an outer brake pad contacting surface opposite to the inner surface, and an annular end face distal to the spoke-mounting wall. Each of the tire-retaining walls further has a tire retaining projection formed at a corner of the end face and the inner surface and adapted to engage a bicycle tire so as to retain the bicycle tire between the tire-retaining walls. The wear-resisting rings are made of a resilient material. Each of the wear-resisting rings extends along the end face of a respective one of the tire-retaining walls, and projects radially and outwardly relative to the end face of the respective one of the tire-retaining walls so as to be adapted to prevent the end face from contacting directly the bicycle tire to minimize wearing of the bicycle tire.
Preferably, the end face of each of the tire-retaining walls is formed with an annular retaining groove therealong. Each of the wear-resisting rings is received in the annular retaining groove in the end face of the respective one of the tire-retaining walls.
REFERENCES:
patent: 5820709 (1998-10-01), Matsuda
Alex Machine Industrial Co., Ltd.
Stormer Russell D.
Towsend and Townsend and Crew LLP
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