U.S. patent application number 11/553045 was filed with the patent office on 2007-03-29 for bicycle control apparatus.
This patent application is currently assigned to SRAM Corporation. Invention is credited to Brian Jordan, Christopher Shipman, Kevin Wesling.
Application Number | 20070068318 11/553045 |
Document ID | / |
Family ID | 36540122 |
Filed Date | 2007-03-29 |
United States Patent
Application |
20070068318 |
Kind Code |
A1 |
Jordan; Brian ; et
al. |
March 29, 2007 |
Bicycle Control Apparatus
Abstract
A bicycle control apparatus configured to allow a rider to
effect a release gear shift without releasing his grip from the
handlebar. The bicycle control apparatus includes a brake lever and
a shift lever wherein the shift lever is moveable in a first
direction to perform a release shift operation and movable in a
second direction toward the handlebar independently of the brake
lever.
Inventors: |
Jordan; Brian; (Chicago,
IL) ; Wesling; Kevin; (Lombard, IL) ; Shipman;
Christopher; (Chicago, IL) |
Correspondence
Address: |
SRAM CORPORATION
1333 N. KINGSBURY, 4TH FLOOR
CHICAGO
IL
60622
US
|
Assignee: |
SRAM Corporation
1333 N. Kingsbury St., 4th Floor
Chicago
IL
60622
|
Family ID: |
36540122 |
Appl. No.: |
11/553045 |
Filed: |
October 26, 2006 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
10906730 |
Mar 3, 2005 |
|
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|
11553045 |
Oct 26, 2006 |
|
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Current U.S.
Class: |
74/502.2 |
Current CPC
Class: |
Y10T 74/20438 20150115;
Y10T 74/20287 20150115; B62M 25/04 20130101 |
Class at
Publication: |
074/502.2 |
International
Class: |
F16C 1/10 20060101
F16C001/10 |
Claims
1. A bicycle control apparatus comprising: a housing mountable to a
bicycle handlebar; a brake lever assembly having a brake lever
movable toward the handlebar; and a shift lever assembly having a
shift lever movable in a first direction to perform a cable-release
operation and movable in a second direction toward the handlebar
independently of the brake lever, the shift lever configured to
move with the brake lever toward the handlebar during brake lever
actuation.
2. The bicycle control apparatus of claim 1 wherein the shift lever
is movable in the first direction toward a bicycle frame.
3. The bicycle control apparatus of claim 2 wherein the shift lever
is rotatable about a first axis in the first direction to perform
the shift operation, the shifter lever rotatable about a second
axis in the second direction toward the handlebar independently of
the brake lever.
4. The bicycle control apparatus of claim 3 wherein the second axis
lies in a plane substantially perpendicular to the first axis.
5. The bicycle control apparatus of claim 3 wherein the second axis
is not lying in a plane substantially perpendicular to the first
axis.
6. The bicycle control apparatus of claim 3 wherein the brake lever
is rotatable about a brake lever axis substantially parallel to the
second axis of the shift lever.
7. The bicycle control apparatus of claim 2 wherein the shift lever
includes first and second portions, the first and second portions
movable in the first direction to perform the shift operation, the
second portion movable in the second direction toward the
handlebar.
8. The bicycle control apparatus of claim 7 wherein the first and
second portions are rotatable about a first axis in the first
direction, the second portion rotatable about a second axis in the
second direction toward the handlebar.
9. The bicycle control apparatus of claim 8 wherein the second axis
lies in a plane substantially perpendicular to the first axis.
10. The bicycle control apparatus of claim 8 wherein the second
axis is not lying in a plane substantially perpendicular to the
first axis.
11. The bicycle control apparatus of claim 8 wherein the brake
lever is rotatable about a brake lever axis substantially parallel
to the second axis.
12. A bicycle control apparatus comprising: a housing mountable to
a bicycle handlebar; a brake lever assembly having a brake lever
movable toward the handlebar; and a shift lever assembly including
at least one shift lever movable in a first direction to perform a
cable-release operation and movable in a second direction toward
the handlebar independently of the brake lever, the shift lever
configured to move with the brake lever toward the handlebar during
brake lever actuation, the shift lever assembly operable in the
same direction by a rider to perform a cable-pull operation and the
cable-release operation.
13. The bicycle control apparatus of claim 12 wherein the shift
lever is rotatable about a first axis in the first direction to
perform the shift operation, the shifter lever rotatable about a
second axis in the second direction toward the handlebar
independently of the brake lever.
14. The bicycle control apparatus of claim 13 wherein the second
axis lies in a plane substantially perpendicular to the first
axis.
15. The bicycle control apparatus of claim 13 wherein the second
axis is not lying in a plane substantially perpendicular to the
first axis.
16. The bicycle control apparatus of claim 13 wherein the brake
lever is rotatable about a brake lever axis substantially parallel
to the second axis of the shift lever.
17. The bicycle control apparatus of claim 12 wherein the shift
lever includes first and second portions, the first and second
portions movable in the first direction to perform the shift
operation, the second portion movable in the second direction
toward the handlebar.
18. The bicycle control apparatus of claim 17 wherein the first and
second portions are rotatable about a first axis in the first
direction, the second portion rotatable about a second axis in the
second direction toward the handlebar.
19. The bicycle control apparatus of claim 18 wherein the second
axis lies in a plane substantially perpendicular to the first
axis.
20. The bicycle control apparatus of claim 18 wherein the second
axis is not lying in a plane substantially perpendicular to the
first axis.
21. The bicycle control apparatus of claim 18 wherein the brake
lever is rotatable about a brake lever axis substantially parallel
to the second axis.
22. A bicycle control apparatus comprising: a housing mountable to
a bicycle handlebar; brake lever assembly means having brake lever
means movable toward the handlebar; and shift lever assembly means
having shift lever means movable in a first direction to perform a
cable-release operation and movable in a second direction toward
the handlebar independently of the brake lever means, the shift
lever means configured to move with the brake lever means toward
the handlebar during brake lever actuation.
23. The bicycle control apparatus of claim 22 wherein the shift
lever means is rotatable about a first axis in the first direction
to perform the shift operation, the shifter lever means rotatable
about a second axis in the second direction toward the handlebar
independently of the brake lever means.
24. The bicycle control apparatus of claim 23 wherein the second
axis lies in a plane substantially perpendicular to the first
axis.
25. The bicycle control apparatus of claim 23 wherein the second
axis is not lying in a plane substantially perpendicular to the
first axis.
26. The bicycle control apparatus of claim 23 wherein the brake
lever means is rotatable about a brake lever axis substantially
parallel to the second axis of the shift lever means.
27. The bicycle control apparatus of claim 22 wherein the shift
lever means includes first and second portions, the first and
second portions movable in the first direction to perform the shift
operation, the second portion movable in the second direction
toward the handlebar.
28. The bicycle control apparatus of claim 27 wherein the first and
second portions are rotatable about a first axis in the first
direction, the second portion rotatable about a second axis in the
second direction toward the handlebar.
29. The bicycle control apparatus of claim 28 wherein the second
axis lies in a plane substantially perpendicular to the first
axis.
30. The bicycle control apparatus of claim 28 wherein the second
axis is not lying in a plane substantially perpendicular to the
first axis.
31. The bicycle control apparatus of claim 28 wherein the brake
lever means is rotatable a brake lever axis substantially parallel
to the second axis of the shift lever means.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation-in-part of application
Ser. No. 10/906,730 filed on Mar. 3, 2005 entitled Bicycle
Shifter.
BACKGROUND OF THE INVENTION
[0002] The present invention relates to a bicycle control
apparatus, and more particularly, to a bicycle control apparatus
having a brake lever and a shift lever wherein the shift lever is
movable in a first direction to perform a shift operation and
movable in a second direction toward the handlebar independently of
the brake lever.
[0003] Some bicycle road shifters position a release shift lever
behind the brake lever, the shift lever being actuable inboard
toward the bicycle frame to effect a cable unwinding or release
operation. A disadvantage found in some such designs is that
although the release shift lever is configured to pivot rearwardly
toward the handlebar with the brake lever, the shift lever is not
configured to pivot rearwardly independently of the brake lever.
This prevents riders from positioning the release shift lever
closer to the handlebar for gear shifts when not braking.
Accordingly, to effect a release shift, riders must at least
partially release their grips from the handlebar and reach forward
with at least one finger to displace the release shift lever
inboard. Other bicycle road shifters are designed to include a
release shift lever on the inboard side of the shifter hood, also
requiring riders to release their grips on the handlebar at least
partially to push the lever down with their thumbs. Therefore,
there is a need for a bicycle road shifter that allows the rider to
maintain a grip on the bar while operating a gear shift lever to
effect a release shift.
SUMMARY OF THE INVENTION
[0004] The present invention provides a bicycle control apparatus
that allows a rider to perform a release gear shift operation,
typically a cable unwinding, without releasing his grip from the
handlebar. Accordingly, the bicycle control apparatus includes a
housing mountable to a bicycle handlebar, a brake lever assembly
and a shift lever assembly. The brake lever assembly includes a
brake lever movable toward the handlebar. The shift lever assembly
includes at least one shift lever movable in a first direction to
perform a release gear shift operation and movable in a second
direction, toward the handlebar, independently of the brake lever.
In one embodiment, the shift lever assembly may include a single
shift lever configured to be movable in the first direction to
perform both cable-winding and cable-unwinding gear shift
operations. In other embodiments, the shift lever assembly may
include discrete shift levers for cable winding and unwinding
operations. The shift lever according to this invention is
configured to move with the brake lever toward the handlebar during
brake lever actuation. The shift lever is rotatable about a first
axis in the first direction to perform the release shift operation
and rotatable about a second axis in the second direction toward
the handlebar. The second axis may lie in a plane substantially
perpendicular to the first axis. In other embodiments of the
present invention, the second axis need not lie in a plane
substantially perpendicular to the first axis. Typically the brake
lever is rotatable about a brake lever axis substantially parallel
to the second axis of the shift lever.
[0005] In one embodiment of the present invention, the shift lever
includes first and second portions. Both portions of the shift
lever are movable in the first direction to perform a gear shift
operation, the second portion of the shift lever is movable in the
second direction toward the handlebar. This configuration allows
the rider to position the shift lever closer to the handlebar to
perform a release shift operation without releasing his grip on the
handlebar. The first and second portions of the shift lever are
rotatable about the first axis in the first direction and the
second portion is rotatable about the second axis in the second
direction toward the handlebar. The second axis may lie in a plane
substantially perpendicular to the first axis. In other
embodiments, the second axis need not lie in a plane perpendicular
to the first axis.
[0006] These and other features and advantages of the invention
will be more fully understood from the following description of
various embodiments of the invention, taken together with the
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] In the drawings:
[0008] FIG. 1 is a perspective view of a bicycle control apparatus
mounted to a drop-style handlebar according to one embodiment of
the present invention;
[0009] FIG. 2 is a partial cross-sectional view of a bicycle
control apparatus according to one embodiment of the present
invention;
[0010] FIG. 3 is an enlarged partial cross-sectional view of the
bicycle control apparatus of FIG. 2;
[0011] FIGS. 4a-4f are cross-sectional views of a holding mechanism
and a drive mechanism at different stages of a cable-release
operation;
[0012] FIGS. 5a-5h are cross-sectional views of the holding
mechanism and the drive mechanism of FIGS. 4a-4f at different
stages of a cable-pull operation;
[0013] FIG. 6a is a perspective view of a rider's hand gripping the
drop of the handlebar, the rider's index finger released from its
grip on the handlebar and in contact with the shift lever
positioned behind the brake lever according to a first mode of
shift lever operation;
[0014] FIG. 6b is a perspective view of a rider's hand gripping the
drop of the handlebar, the rider's index finger deflecting the
shift lever inboard to effect a gear shift according to a first
mode of shift lever operation;
[0015] FIG. 7a is a perspective view of the rider's hand gripping
the drop of the handlebar, the rider's index finger released from
its grip on the handlebar and in contact with the shift lever
positioned behind the brake lever according to a second mode of
shift lever operation;
[0016] FIG. 7b is a perspective view of the rider's hand gripping
the drop of the handlebar, the rider's index finger drawing the
shift lever toward the handlebar according to a second mode of
shift lever operation;
[0017] FIG. 7c is a perspective view of the rider's hand gripping
the drop of the handlebar, the shift lever within the rider's grasp
as he twists his hand to effect a release shift operation according
to a second mode of shift lever operation;
[0018] FIG. 7d is a perspective view of the rider's hand gripping
the drop of the handlebar, the rider's index finger releasing the
shift lever toward its rest position behind the brake lever
according to a second mode of shift lever operation; and
[0019] FIG. 8 is a top view of a bicycle control apparatus
according to another embodiment of the present invention with a
different axis orientation.
DETAILED DESCRIPTION
[0020] FIGS. 1-7 illustrate a bicycle control apparatus 10
mountable to a handlebar 12 according to one embodiment of the
present invention. The bicycle control apparatus 10 generally
includes a housing 18, a shift lever assembly 21 and a brake lever
assembly 23. The housing 18 is mountable to a handlebar 12,
typically a drop-style handler found on a road bike. Looking to
FIGS. 1 and 2, the handlebar 12 includes an upper portion 13
extending across the bicycle frame (not shown), a curved portion 15
extending downward from the upper portion, and a lower portion 17
extending rearward toward the rider. The curved portion 15 and the
lower portion 17 are commonly referred to as the "drops." The
housing 18 is typically mounted to the curved portion 15 of the
handlebar 12 by a clamp 14 and a bolt 16.
[0021] The shift lever assembly 21 pulls or releases a control
cable 11 connected to gear change mechanism (not shown) to shift
between various gear positions. The gear change mechanism may be a
derailleur or other external or internal gear change devices. In
this embodiment, the shift lever assembly 21 generally includes the
housing 18, a shift lever 20, a takeup member 22, a holding
mechanism 24 and a drive mechanism 26. In this embodiment, the
shift lever assembly 21 is integrated with the brake lever assembly
23. The brake lever assembly 23 includes a brake lever 28 pivotable
about a shaft 30 or brake lever axis 31. The brake lever 28 is
displaceable or movable toward the handlebar 12 to pull a brake
cable (not shown) to slow the bicycle. Alternatively, the brake
lever assembly may be separate from the shift lever assembly.
[0022] Looking to FIGS. 2 and 3, in this embodiment, the housing 18
is mounted to the handlebar 12, a mounting shaft 32 or a first axis
33 extending through the housing 18. The shift lever 20 is biased
toward a rest position, preferably tucked behind the brake lever
28, by a preloaded shift lever return spring 38. A first leg 40 of
the shift lever return spring 38 is coupled with the housing 18
while a second leg 44 of the shift lever return spring 38 is
coupled with the shift lever 20. The shift lever 20 includes a
first portion 34 rotatably mounted to the shaft 32, and a second
portion 36 preferably paddle-shaped for easy reach by the rider's
fingers. The second portion 36 of shift lever 20 is configured to
rotate about shaft 32 along with first portion 34, and to rotate
about a lever shaft 48 or second axis 49 mounted to the first
portion 34 of the shift lever 20. The second axis 49 may lie in a
plane substantially perpendicular to the first axis 33.
Alternatively, the second axis 49 need not lie in a plane
substantially perpendicular to the first axis 33, for example, it
may be parallel to the brake axis 31 (see FIG. 8). The second
portion 36 of the shift lever 20 is biased by a preloaded return
spring 50 mounted coaxially with the lever shaft 48. A first leg of
the return spring 50 is coupled with the second portion 36 of the
shift lever 20 while a second leg of the return spring 50 is
supported by the first portion 34 of the shift lever 20. In this
embodiment, the second portion 36 of the shift lever 20 moves with
the brake lever 28 when the brake lever 28 is actuated toward the
handlebar. Further, the second portion 36 of the shift lever 20 is
displaceable toward the handlebar independently of the brake lever
28.
[0023] The takeup member 22, in this embodiment a spool, is
rotatably mounted to the shaft 32. The takeup member 22 includes a
groove 52 along its periphery for receiving the control cable 11.
The takeup member 22 is biased in the cable-release direction by
tension in the control cable 11 and, preferably, by a takeup member
return spring 54. The takeup member return spring 54 is biased
between the takeup member 22 and the housing 18. The return spring
54 includes a first leg 56 received in an opening 58 in the takeup
member 22, and a second leg 60 received in an opening 62 in the
housing 18.
[0024] Looking to FIGS. 2-5h, the shift lever assembly 21 includes
a ratchet wheel 64 having a plurality of teeth 66 about its
periphery, while the holding mechanism 24 includes a holding pawl
68 engageable with the teeth 66 to prevent unwinding of the takeup
member 22. The ratchet wheel 64 is rotatably mounted to the shaft
32 and rotates with the takeup member 22. The ratchet wheel teeth
66 correspond to gear positions of the gear change mechanism.
Alternatively, the ratchet wheel 64 and the takeup member 22 may be
formed as one piece. The holding pawl 68 is rotatable about a
holding pawl pivot 70 fixed to the housing 18, and is axially
positioned by a retaining ring 72. The holding pawl 68 includes a
body 74 and a nose 76 extending from the body 74. The holding pawl
nose 76 is biased to engage the ratchet wheel teeth 66 by a
preloaded holding pawl spring 78 coaxially mounted to the holding
pawl pivot 70. A first leg 80 of the holding pawl spring 78 is
received in an opening in the housing 18, and a second leg 86 is
supported by the holding pawl 68.
[0025] The drive mechanism 26 includes a drive pawl 84 rotatably
mounted about a drive pawl pivot 90 fixed to the shift lever 20.
The drive pawl 84 is axially positioned by a retaining ring 92. The
drive pawl 84 includes a body 94, a nose 96 extending from the body
94, and a tail 98. A drive pawl spring 100 biases the drive pawl
nose 96 toward the ratchet wheel teeth 66. The tail 98 of the drive
pawl 84 rests against a declutching element 88, in this embodiment,
a declutching wall 88 of the housing 18, when the shift lever 20 is
in its rest position.
[0026] The shift lever 20 has two modes of operation. Prior to the
first mode of operation, the shift lever 20 is biased toward a rest
position, the second portion 36 of the shift lever preferably
positioned behind the brake lever 28 as shown in FIGS. 1, 2, and 6.
To perform a cable release shift, both the first and second
portions 34, 36 of the shift lever 20 are rotated about the shaft
32 in a first direction A for a first shift movement toward the
bicycle frame. In the shifter embodiment shown, the shift lever 20
may also be pivoted in the same direction for a second shift
movement to pull the control cable 11, the second shift movement
being greater than the first shift movement. In alternative
embodiments, the shift lever assembly 21 may be configured to
perform only cable release gear changes. To shift gears in the
first mode of operation, the rider partially releases his grip on
the handlebar and uses a finger to push the paddle 36 inboard in
direction A (see FIGS. 6a, 6b). During the second mode of
operation, before performing a shift operation, the rider draws the
second portion of the shift lever 20 toward the handlebar 12
independently of the brake lever 28 (FIGS. 7a, 7b). Then with the
paddle 36 in his grasp, the rider twists his hand to perform a
release shift, the shift operation performed by rotating both first
and second portions 34, 36 about the shaft 32 to release the
control cable 11 (FIG. 7c). In the second mode of operation the
rider need not remove his hand from the drops of the handlebar to
perform a release shift, he simply twists his wrist to move the
shift lever in the first direction. After the release shift, the
rider may release the shift lever 20 to its rest position behind
the brake lever 23 (FIG. 7d) or alternatively may continue to grasp
the shift lever in preparation for a subsequent release shift.
[0027] Looking to FIGS. 4a-4f, a cable-release operation is
described. Before the shift lever 20 is actuated, the tail 98 of
the drive pawl 84 rests against the declutching wall 88 positioning
the shift lever 20 in its rest position (FIG. 4a). Further, the
takeup member 22 and the ratchet wheel 64 are retained in a
selected gear position by the holding pawl 68, shown engaging a
corresponding first tooth 102.
[0028] Looking to FIG. 4b, as the shift lever 20 is actuated by the
rider, the lever 20 rotates about the shaft 32, moving the drive
pawl 84 away from the declutching wall 88 and pivoting the drive
pawl nose 96 toward the ratchet wheel teeth 66. Looking to FIG. 4c,
as the lever 20 is further rotated, the drive pawl nose 96 engages
the holding pawl nose 76 causing the holding pawl 68 to release the
first tooth 102 of the ratchet wheel 64. Once released, the ratchet
wheel 64 rotates about the shaft 32 in the cable-release direction
until the first tooth 102 engages the drive pawl nose 96. This
action provides both audible and tactile feedback to the rider
signaling the rider to release the shift lever 20 to complete the
cable-release operation.
[0029] Looking to FIG. 4d, as the shift lever 20 is released toward
its rest position, the ratchet wheel 64 rotates in the
cable-release direction. Further, the holding pawl nose 76 moves
toward engagement with a recess 104 associated with an adjoining
second tooth 106 of the ratchet wheel 64, and the drive pawl tail
98 moves toward engagement with the declutching wall 88. As the
shift lever 20 rotates further toward its rest position, the drive
pawl nose 96 pivots further away from the ratchet wheel teeth 66
biased by the drive pawl as the drive pawl tail 98 bears against
the declutching wall 88 (FIG. 4e). When the drive pawl 84
disengages from the ratchet wheel teeth 66, the ratchet wheel 64
rotates in the cable-release direction under the force of the
control cable 11 and the takeup member return spring 54, until the
holding pawl nose 76 engages the second adjoining ratchet wheel
tooth 106, resulting in a single increment gear shift in the cable
release direction. At the end of the cable-release operation, the
drive pawl 84 moves back to its rest position against the
declutching wall 88 (FIG. 4f), positioning the shift lever 20 in
its rest position.
[0030] Looking to FIGS. 5a-5h, a cable-pull operation is described.
Before the shift lever 20 is actuated, the drive pawl tail 98 rests
against the declutching wall 88, positioning the shift lever 20 is
in its rest position (FIG. 5a). So positioned, the ratchet wheel 64
is retained in a selected gear position with the holding pawl 68
engaging the first ratchet wheel tooth 102. As the shift lever 20
is actuated by the rider in the shift direction, the drive pawl 84
moves away from the declutching wall 88, positioning the drive pawl
nose 96 toward the ratchet wheel teeth 66 (FIG. 5b).
[0031] Looking to FIG. 5c, as the shift lever 20 is further
rotated, the drive pawl nose 96 engages the holding pawl nose 76,
driving the holding pawl nose 76 out of engagement with the first
ratchet wheel tooth 102. Once released, the ratchet wheel 64
rotates in the cable-release direction until the first tooth 102
engages the drive pawl nose 96. As the shift lever 20 is further
rotated in the shift direction, the drive pawl 84 drives the
ratchet wheel 64 in cable-pull direction, as the holding pawl 68
free-clutches, the holding pawl nose 76 freely sliding along the
ratchet wheel teeth 66 (FIG. 5d).
[0032] Looking to FIG. 5e, as the shift lever 20 is further
rotated, the drive pawl 84 further rotates the ratchet wheel 64 in
the cable-pull direction until the holding pawl 68 engages a next
third tooth 110 on the ratchet wheel 64, resulting in a single gear
shift in the cable-pull direction. The rider is, of course, not
limited to single gear shift increments in the cable-pull
direction. The rider may readily shift multiple gear increments in
the cable-pull direction by simply continuing to move the shift
lever in the shift direction until the desired gear position is
reached. Audible and tactile feedback is provided to the rider as
each gear shift increment is passed.
[0033] Looking to FIG. 5f, after the desired gear position is
reached, the rider releases the shift lever 20 causing the shift
lever 20 and the drive pawl 84 to rotate toward their rest
positions under the force of the shift lever return spring 38. As
the shift lever 20 further rotates toward its rest position, the
drive pawl tail 98 bears against the declutching wall 88 rotatably
biasing the drive pawl 84 away from the ratchet wheel teeth 66
(FIG. 5g). Looking to FIG. 5h, the drive pawl 84 is in its rest
position against the declutching wall 88, with the drive pawl nose
96 disengaged from the ratchet wheel 64.
[0034] While this invention has been described by reference to one
or more preferred embodiments, it should be understood that
numerous changes could be made within the spirit and scope of the
inventive concepts described. Accordingly, it is intended that the
invention not be limited to the disclosed embodiments, but that it
have the full scope permitted by the language of the following
claims.
* * * * *