Land vehicles: wheels and axles – Wheel – Tension wheel; e.g. – spoke
Reexamination Certificate
2001-02-09
2002-12-10
Stormer, Russell D. (Department: 3617)
Land vehicles: wheels and axles
Wheel
Tension wheel; e.g., spoke
C301S104000, C301S110500
Reexamination Certificate
active
06491350
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a rear bicycle wheel.
FIG. 1
of the annexed drawings illustrates a rear wheel of a known type mounted on the frame of a bicycle
10
having two fork-shaped arms
12
provided at their bottom ends with seats, designated generically by
14
, for fixing of a pin defining an axis
16
of transverse rotation. The rear wheel, designated as a whole by
18
, comprises a rim
20
having a median plane
22
set in a central position with respect to the arms
12
and the seats
14
for attachment of the frame
10
. The wheel
18
comprises a hub
24
that carries a set of sprockets
26
set coaxially with the hub
24
. The rim
20
and the hub
24
are connected together by means of one first set of spokes and one second set of spokes, designated, respectively, by
28
a
and
28
b.
The spokes
28
a
of the first set are anchored along one side of the hub
24
adjacent to the sprocket set
26
, whilst the spokes
28
b
of the second set are anchored to the hub
24
on the side of the latter further away from the sprocket set
26
.
On account of the encumbrance of the sprocket set
26
in the direction of the transverse axis
16
, the spokes
28
a,
28
b
have a different inclination with respect to the median plane
22
of the wheel
18
. In
FIG. 1
, the angles of inclination of the spokes
28
a
and
28
b
with respect to the median plane
22
are designated, respectively, by &agr; and &bgr;. The difference between the angles &agr; and &bgr; is greater, the greater is the axial encumbrance of the sprocket set
26
.
In traditional solutions, the fact that the spokes
28
a
and
28
b
have a different inclination with respect to the median plane
22
means that the said spokes are subjected to different tensioning forces. In particular, the tensioning force of the spokes
28
a
will have to be considerably higher than the tensioning force of the spokes
28
b
in order to keep the rim
20
centred with respect to the median plane
22
of the wheel. If the mean tensioning forces of the spokes
28
a
and
28
b
are respectively designated by F
a
and F
b
, in order to have correct centring of the rim
20
with respect to the median plane
22
, the components of these forces in the direction parallel to the axis of rotation of the wheel must be equal and opposite to one another.
The main drawback of the known solution previously described lies in the fact that the spokes of the wheel that are adjacent to the sprocket set undergo a very high tensioning force and are much more subject to the risk of failure as compared to the spokes located on the side of the wheel opposite to the sprocket set.
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide a rear bicycle wheel that is free from the aforementioned drawback.
In accordance with the present invention, the above purpose is achieved by a bicycle wheel having the characteristics that form the subject of the main claim.
The characteristics and advantages of the present invention will emerge clearly from the ensuing detailed description, which is provided purely by way of non-limiting example, with reference to the attached drawings in which:
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Campagnolo SRL
Stormer Russell D.
Volpe and Koenig P.C.
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