Bicycle wheel rim

Details Bicycle wheel rim Bicycle wheel rim

2000-06-12

2001-08-14

Morano, S. Joseph (Department: 3617)

Land vehicles: wheels and axles

Wheel

Rim

Reexamination Certificate

active

06273518

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a bicycle wheel rim, more particularly to a bicycle wheel rim with an enhanced braking effect.
2. Description of the Related Art
U.S. Pat. No. 3,433,327 discloses a bicycle wheel rim
1
which, as shown in
FIG. 1
, has an external braking surface that is formed with a series of parallel grooves
11
in an undulating pattern and a plurality of transverse grooves
13
that extend in radial directions to interconnect the undulating parallel grooves
11
. When it rains, or when the bicycle is ridden through puddles of water, the water collected in the parallel grooves
11
can escape laterally via the transverse grooves
13
and travel away from the center of the braking surface so as to pass beyond the area to which a brake pad is applied. However, as the transverse grooves
13
do not open at a radial inner edge portion
14
of the braking surface, and at a radial outer edge portion
15
of the same, water can still accumulate in the undulating parallel grooves
11
and the transverse grooves
13
to form a fluid film that lubricates the braking surface, especially when the bicycle is ridden under heavy rain conditions.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a bicycle wheel rim with a relatively good draining effect for draining water from a brake pad contacting surface thereof so as to provide an enhanced braking effect.
Accordingly, the bicycle wheel rim of the present invention includes spaced left and right annular tire retaining walls adapted for retaining a bicycle tire therebetween. Each of the tire retaining walls has a central axis, a radial inner edge proximate to the central axis, a radial outer edge distal to the central axis, and a brake pad contacting surface opposite to the other one of the tire retaining walls. An annular spoke mounting wall interconnects the radial inner edges of the tire retaining walls. The brake pad contacting surface of at least one of the tire retaining walls is formed with a plurality of radial grooves which are spaced apart from each other in a circumferential direction relative to the central axis, and which extend along radial directions of said at least one of the tire retaining walls from the radial inner edge to the radial outer edge. Each of the radial grooves has at least two opposite open ends formed respectively through the radial inner and radial outer edges of said at least one of the tire retaining walls.


REFERENCES:
patent: 3305048 (1967-02-01), Brilando
patent: 3433327 (1969-03-01), Regis
patent: 3732951 (1973-05-01), Hata et al.
patent: 5064027 (1991-11-01), Akamatsu
patent: 6065812 (2000-05-01), Lee
patent: 6109399 (2000-08-01), Crawford et al.
patent: 6120105 (2000-09-01), Chern

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