Patent Application
20120167706
The present invention refers to a control lever for an actuation device of a bicycle gearshift of the bar-end type, to an actuation device comprising such a control lever and to a pair of such devices for the two ends of handlebars.
It is well-known that in bicycles intended for competition there is a constant search for solutions to improve performance. In particular, for bicycles intended for speed races, such as typically time trials, it is particularly important to have good aerodynamic configuration of all of the components of the bicycle. Moreover, a factor in improving performance is considered to be the efficiency of all of the controls but also the ease and safety with which they are actuated, so that the cyclist is able to concentrate on the physical effort without hindrances due to difficulties in actuating the controls.
Recently, it has become common to use specialised handlebars specifically for speed races, which have their two ends facing significantly forwards; this allows the cyclist to maintain his/her bust in a forward leaning position that is aerodynamically efficient.
With these handlebars, specific actuation devices have also become common, both for the brakes and for the gearshifts; these devices are commonly known as bar-end since they are housed right at the ends of the handlebars, so that the cyclist can easily actuate them.
The Applicant has realised that it is possible to improve the overall efficiency of a device of this type, in particular of an actuation device of the gearshift, by making it such that the cyclist takes up the aerodynamically best hand position and can actuate the device without a substantial change in position.
In general, the actuation device includes a control lever that is made part of the device which is mounted at respective end of the handlebars. The control lever has a body with a main axis and an arm which projects from the body according to a main axis and is substantially tangential to the upper part of the body. The arm is further configured to provide at least a first upper pressure area that is concave and adjacent to the body and a second lower pressure area that is remote from the body.
The cyclist, while gripping the handlebars at the end, during pedalling, can engage the first pressure area with the thumb, bent to grip the control lever in a position very close to the end of the handlebars, where the hand sits, with the index finger bent under the control lever. As a result there is an aerodynamically favourable position, because the thumb is in part housed within the control lever due to the concavity of the first pressure area. Moreover, the cyclist can carry out upward and downward gearshifting without substantially having to change his hand position; this makes it easier to both carry out gearshifting quickly and to maintain aerodynamically favourable conditions.
Preferably, there is a third lower pressure area, which is concave, between the body and the second pressure area. This third pressure area makes it possible to have an alternative position for the index finger, bent under the control lever instead of straight. This position is also aerodynamically favourable, because the index finger stays partially housed within the concave pressure area, and also in this position the cyclist can have complete control of the actuation device to carry out gearshifting.
Even more preferably, there is a fourth upper pressure area, remote from the body. This fourth pressure area makes it possible to have an alternative position for the thumb, stretched out on top of the control lever instead of bent. This position is also aerodynamically favourable, because the thumb is stretched out forwards, and also in this position the cyclist can have complete control of the actuation device to carry out gearshifting.
The fourth pressure area can be flat or else preferably slightly concave, so as to match the typical anatomy of the thumb, in which the third phalange (the outer one) projects slightly further (towards the other fingers) than the second phalange, so as to promote aerodynamics.
Preferably, the second pressure area is substantially flat or possibly slightly concave, so as to match the typical anatomy of the index finger, in which the phalanges do not have marked projections, so as to promote good aerodynamics.
More preferably, the second pressure area is arranged a greater distance from the main axis than the other pressure areas. With this configuration the stroke that the index finger must make to command gearshifting is reduced, thus facilitating the manoeuvre.
Preferably, the depth of the concavity of the first pressure area is greater on one side than on the other, with respect to the main axis of the arm. Indeed, it may be suitable to leave a greater depth on the inner side, with respect to the direction of travel, due to the inclination that the thumb can take up when resting on the control lever.
Preferably, the depth of the concavity of the third pressure area is greater on one side than on the other, with respect to the main axis of the arm. Indeed, it may be suitable to leave a greater depth on the inner side, with respect to the direction of travel, due to the inclination that the index finger can take up when resting on the control lever.
Preferably, the shape in plan of the arm is tapered going away from the body. Preferably, the arm has an end remote from the inclined body, both with respect to the main axis of the arm, and with respect to a direction perpendicular to the main axis. Both of these shape characteristics give the control lever better aerodynamics.
In its second aspect, the invention more specifically concerns an actuation device of a bicycle gearshift of the bar-end type, comprising a casing adapted to be mounted at the end of handlebars facing forwards in the direction of travel of the bicycle and a control lever with the characteristics illustrated above, supported so as to be able to rotate with respect to the casing according to the axis of the cylindrical body of the control lever.
Preferably, the body of the control lever is mounted asymmetrically on the casing, laterally displaced with respect to the main axis of the arm. This lateral displacement ensures that the index finger of the hand that grips the control lever together with the control lever itself forms a unit substantially aligned with the end of the forward-facing handlebars, with an overall aerodynamic advantage.
Preferably, in a pair of actuation devices with the characteristics illustrated above, in one of the devices the body of the control lever is mounted asymmetrically displaced on one side, whereas in the other of the devices it is mounted asymmetrically displaced on the other side. More preferably, in the device intended for the right end of the handlebars the body of the control lever is mounted on the casing asymmetrically displaced to the left, whereas in the device intended for the left end of the handlebars the body of the control lever is mounted on the casing asymmetrically displaced to the right.
Further characteristics and advantages of the invention will become clearer from the following description of a preferred embodiment thereof, made with reference to the attached drawings. In such drawings:
The figures show an actuation device 100 of the control cable of a gearshift of a racing bicycle (not shown), in particular for speed races. The device 100 is a so-called bar-end device, mounted on the left end MS of bicycle handlebars of the type used on racing bicycles, and even more specifically bicycles specialised for time trials; in such handlebars, the left end MS (as well as the right end MD) faces forwards, with respect to the direction of forward motion of the bicycle, according to a main axis A.
The device 100 comprises a casing 110 adapted to be mounted at the end of the handlebars MS and a control lever 120, supported by the casing 110 able to rotate with respect to an axis T, transversal with respect to the direction A.
The control lever 120 comprises a substantially cylindrical body 130, coaxial to the axis T, and an arm 140, projecting with respect to the body 130 in the direction of the main axis A, which is substantially tangential to the upper part of the body 130. In use, the arm 140 thus faces forwards in the direction of travel of the bicycle. The body 130 of the control lever 120 is mounted asymmetrically on the casing 110, laterally displaced with respect to the main axis A of the arm 140, in particular towards the right side on the device 100 intended for the left end MS of handlebars.
The arm 140 comprises a first upper pressure area 141, concave and adjacent to the body 130, and a second lower pressure area 142, remote from the body and preferably substantially flat.
The arm 140 also comprises a third lower pressure area 143, concave, between the body 130 and the second pressure area 142.
The arm 140 also comprises a fourth upper pressure area 144, remote from the body 130, preferably slightly concave.
The depth of the concavity of the first pressure area 141 is greater on one side (in particular the left side on the device 100 intended for the left end MS of handlebars), than on the other, with respect to the main axis A of the arm 140. This greater depth is visible particularly in
The depth of the concavity of the third pressure area 143 is greater on one side (in particular the left side on the device 100 intended for the left end MS of handlebars), than on the other, with respect to the main axis A of the arm 140. This greater depth is visible particularly in
The second pressure area 142 is a greater distance from the main axis A.
The shape in plan of the arm 140 is tapered going away from the body 130 and ends in an end 148 remote from the body 130, inclined both with respect to the main axis A of the arm 140, and with respect to a direction perpendicular to the main axis A, thus parallel to the axis T.
The devices 100, 200 are thus mounted with the respective bodies 130 of the control lever 120 mounted asymmetrically displaced on opposite sides, the right side for the device 100 and the left side for the device 200.
In operation, the cyclist grips the handlebars at the two ends MS and MD, with the hands resting on the casings 110. In a preferred configuration, the cyclist holds his thumb resting on the first pressure area 141, above the arm 140, and the index finger resting with pressure under the arm 140. The thumb is partially housed in the control lever 120 due to the concave shape of the first pressure area 141.
With the fingers in this position, the combination of the hands and the devices 100, 200 takes up an aerodynamically favourable configuration. Moreover, the cyclist can substantially maintain such a position during any gearshifting, because the thumb is already in a position suitable for acting directly and immediately on the control lever 120, whereas the index finger only has to be stretched forward, under the second pressure area 142.
An alternative position for the index finger is offered by the third pressure area 143. When resting in this area, the index finger is bent, partially housed in the control lever 120 thanks to the concave shape of the third pressure area 143. Also in this case, the overall configuration is aerodynamically favourable and the manoeuvring possibilities remain unchanged.
An alternative position for the thumb is offered by the fourth pressure area 144. When resting in this area, the thumb is stretched out, more stretched than when resting on the first pressure area 141, and partially housed in the control lever 120 thanks to the concave shape of the fourth pressure area 144. Also in this case, the overall configuration is aerodynamically favourable and the manoeuvring possibilities remain unchanged.
As can be seen with reference to
| Number | Date | Country | Kind |
|---|---|---|---|
| 10015256.0 | Dec 2010 | EP | regional |
