JPH05193550A - Speed change operating device for bicycle - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of the turning resistance by constituting an engagement mechanism so that an engagement body which turns together with a speed change operating body is fitted with a revolution resistance by fitting a frictional member on the engagement body and constituting the frictional member from a slide contact part and a joint part having an outwardly projecting shape, and freely adjusting the tightening through the joint part. CONSTITUTION:An engagement mechanism 24 is constituted of a ratchet mechanism 25 which holds a cylindrical operating body 4a at a turning position when the cylindrical operating body 4b pulls an inner cable and a resistance applying means 26. A frictional band 33 is installed on the ratchet wheel 27 of a ratchet mechanism 2, and a resistance applying element part 31 is formed. The frictional band 33 is formed from a strip shaped leaf spring member, and is constituted of an arcuate slide contact part 33a, joint part 33b, and a pair of tightening parts 33c which are approached each other by a tightening means 50. The tightening force of the resistance applying element part 31 of the slide contact part 33a is adjusted by adjusting the interval of the tightening parts 33c by the tightening means 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle gear shift operation device.

[0002]

2. Description of the Related Art A gear shift operating lever device for operating a bicycle transmission is provided with a boss portion around which an end portion of an operating cable is wound and held, and an arm portion on which a rider puts a finger. In many cases, the lever body is supported by a lever shaft provided on a lower pipe of the bicycle frame or the like so as to be rotatably operated with a certain rotation resistance.

In this type of lever device, when the lever main body is rotated in one direction, the operation cable is pulled so as to be wound around the outer periphery of the boss portion, while the lever main body is rotated in the opposite direction. Then, the operation cable wound around the boss portion is paid out, and thereby the operation cable is configured to be axially moved. The gear shift operation lever device has a locking mechanism for stopping the lever main body, which is constantly biased in one direction by receiving the pulling force of the operation cable, to overcome the pulling force and stop at a desired turning position. Is provided.

Usually, the locking mechanism is constructed so as to give a constant rotational resistance due to frictional force to the base end portion of the lever. That is, in the operation lever device,
While the base end of the lever is rotatably fitted onto the lever shaft provided at the appropriate portion of the frame, the friction member that directly or indirectly presses the outer surface of the base end is not rotatable. It is fitted as much as possible. Then, a screwing member such as a bolt is screwed into the tip end portion of the lever shaft, and the amount of advancement of the screwing member is adjusted to adjust the frictional resistance between the friction member and the base end portion of the lever. Then, the lever is configured to have a constant rotational resistance.

By the way, in the above gear shift operation lever device,
When operating the lever body in the direction to extend the operation cable, a relatively small operation force is obtained by subtracting the pulling force applied to the operation cable by the return spring of the transmission body from the frictional force acting on the lever body. On the other hand, when operating the lever body in the direction of pulling the operation cable, the operation force that overcomes the reaction force that is the sum of the frictional force that acts when the lever body rotates and the pulling force that is applied to the operation cable. Requires. For this reason,
The above-described conventional shift operation lever device has a problem that it is difficult to perform a delicate operation when operating the lever in the direction of pulling the operation cable.

In order to solve the above problems, for example, as disclosed in Japanese Utility Model Laid-Open No. 1-1195,
By rotatably supporting the boss portion of the lever body via the ratchet mechanism, when the lever body is rotated in the feeding direction of the operation cable, the ratchet wheel and the ratchet pawl are engaged. The lever main body is configured so as not to return and rotate relative to the ratchet wheel, and the gear shift operation lever can be held at a predetermined rotational position substantially by the frictional force applied to the ratchet wheel. When the lever main body is rotated in the direction of pulling the operation cable, there is provided a structure that can be rotated regardless of the frictional force acting on the ratchet wheel.

[0007]

However, since the friction member in the conventional locking mechanism is configured to press the friction member against the side surface of the boss portion of the gear shift operating lever or the side surface of the ratchet wheel, the friction member described above is used. There is the problem that it is very difficult to adjust the turning resistance caused by the member.

That is, the friction member is formed by adjusting the amount of advance of the screwing member screwed to the tip of the lever shaft. However, the elastic deformation of the friction member is small and elastic The adjustment range is very narrow. For this reason, it is difficult to set the optimum rotation resistance, and the problem that the operability of the gear shift operation lever deteriorates easily occurs.

Further, as disclosed in Japanese Utility Model Laid-Open No. 58-46693, a tubular operating body is fitted on the outer circumferences of the left and right handlebars, and the tubular operating body is rotated. There has been proposed a so-called handle rotation type speed change operation device capable of pulling or extending the speed change operation cable. In the handle rotation type gear shift operation device as described above, it is not necessary to release the hand from the handlebar to perform the gear shift operation, the one-handed driving is not performed, and it is possible to cope with a quick brake operation. , The steering safety is significantly improved.

However, the tubular operating body described in the above publication is constructed such that the gear shifting operation cable is wound around the outer circumference of the handlebar, and like the boss portion of the conventional gear shifting operating lever device, the side surface is provided. It is difficult to provide a portion for pressing the friction member. Even if the friction member is provided, a space is required in the axial direction of the handle bar, which causes interference with the brake lever device and the like.

The present invention has been devised under the circumstances described above, and it is possible to solve the above-mentioned problems of the related art and to adjust the turning resistance applied to the speed change operating body very easily. An object of the present invention is to provide a bicycle gear shift operation device that includes a locking mechanism that can provide stable rotation resistance.

[0012]

In order to solve the above problems, the present invention takes the following technical means. That is, the invention of the present application includes a speed change operation body supported by an appropriate portion of a bicycle frame so as to be rotatable, and a locking mechanism for locking the speed change operation body at a predetermined rotation position. In the bicycle gear shift operation device configured such that the transmission main body is actuated by the gear shift operation cable that is towed or extended by the rotation operation of, the locking mechanism has a cylindrical outer peripheral surface, And a substantially annular friction member fitted to the locking body and providing a predetermined rotation resistance to the locking body. The friction member is
A plurality of arc-shaped sliding contact portions that are slidably contacted with the outer peripheral surface of the locking body, and integrally formed between the end portions of the adjacent sliding contact portions,
A plurality of joints that are bulged outward in the radial direction and are separated from the outer peripheral surface of the locking body, and extend outward in the radial direction from the ends of the sliding contact portions in a substantially parallel manner. And a pair of tightening portions that are brought close to each other by tightening means.

[0013]

The locking mechanism according to the present invention comprises:
An engagement body having a cylindrical outer peripheral surface and rotated with the speed change operation body, and a substantially annular friction member fitted on the engagement body and giving a predetermined rotation resistance to the engagement body. And is configured. The friction member is arranged so as to be wound around the cylindrical outer peripheral surface, and is brought into sliding contact with the outer peripheral surface of the locking body so as to give a predetermined rotation resistance to the locking body. Is configured.

The friction member is integrally formed between a plurality of arcuate slidable contact portions that are slidably contacted with the outer peripheral surface of the locking body, and the end portions of the slidable contact portions that are adjacent to each other. And a plurality of joints that are bulged and separated from the outer peripheral surface of the locking body. By providing the joint part,
Each of the sliding contact portions is easily elastically displaced with the joint portion as a node, and is provided with a larger spring property as compared with the conventional simple plate-shaped friction member. Therefore, by bringing a pair of tightening portions, which extend substantially parallel to the radial direction outward from the ends of the adjacent sliding contact parts, to approach each other by tightening means such as tightening bolts, the friction member itself is It is possible to store the elastic force for tightening the locking body.

Therefore, the respective sliding contact portions are brought into sliding contact with the outer peripheral surface of the locking body with a uniform pressing force, so that stable locking resistance can be given to the locking body and the locking body can be provided. It is possible to finely adjust the applied turning resistance, and it is possible to set the optimum turning resistance. Further, since the tightening means for bringing the tightening portions close to each other can be arranged in the direction perpendicular to the shaft of the friction member, the axial dimension of the speed change operating body does not increase.

Further, since the friction member according to the present invention is constructed so as to be slidably contacted with the outer peripheral surface of the locking body, it has a tubular operation body fitted over the handle bar. It is also possible to apply it to a speed change operation device. Moreover, since the friction member is provided with the joint portion formed so as to be bulged outward in the radial direction and separated from the outer peripheral surface of the locking body, the joint portion and the locking It becomes possible to hold the grease in the space formed between the outer peripheral surface of the body. Therefore, it is possible to reduce wear of the locking body and the friction member and maintain stable performance for a long period of time.

[0017]

Description of Embodiments Embodiments according to the present invention will be specifically described below with reference to the drawings. As shown in FIG. 1, the gear shift operating devices 5a and 5b according to the present invention are cylindrical as a gear shift operating body that is rotatably fitted and supported on the outer periphery of the left and right grip portions 3a and 3b of the handlebar 2. Equipped with operating bodies 4a, 4b,
By rotating the cylindrical operation bodies 4a and 4b,
It is configured to operate the front transmission 1a or the rear transmission 1b.

Although the following description will be made of an example of the right gear shift operating device 5b that operates the rear transmission 1b, the left gear shift operating device 5a that operates the front transmission 1a has substantially the same configuration. There is.

The shift operating device 5b according to this embodiment is shown in FIG.
As shown in, the right brake lever device 6b and the right grip portion 3b are integrally formed. At the base end of the brake bracket 8 of the brake lever device 6b,
There is provided a cylindrical mounting portion 10 having a slit 9 in which a part of the peripheral wall is cut out in the axial direction so that the inner and outer peripheries communicate with each other. The cylindrical mounting portion 10 is provided on the grip portion 3 b of the handlebar 2. The slit 9 is fitted on the inside in the vehicle width direction,
The brake bracket 8 and the gear shift operating device 5b are fixed to the handlebar 2 by forcibly elastically reducing the inner diameter of the cylindrical mounting portion 10 with a mounting screw 11 that is screwed across the same.

The brake lever device 6 according to the present embodiment.
As shown in FIGS. 2 and 3, b is a brake bracket 8 provided so as to project from the front surface of the handlebar 2 toward the front of the vehicle body, and a base end portion of the lever shaft 12 provided on the brake bracket 8. Is rotatably connected and has a brake lever 13 extending in front of the handle grip 7. The brake cable W, which is composed of the inner cable w1 and the outer cable w2 inserted into the inner cable w1, is fixed to the inner end of the brake bracket 8 in the vehicle width direction, while the inner cable w1 is braked. It is introduced into the internal space of the bracket 8, and the nipple 13a at its end is used for the brake lever 1 described above.
It is fixed to the base end of 3.

The gear shift operating device 5b according to the present embodiment has the cylindrical mounting portion 10 fitted and fixed to the handlebar 2.
The outer side of the vehicle in the vehicle width direction, that is, the tubular operating body 4b that is rotatably fitted onto the outer periphery of the right grip portion 3b of the handlebar 2 and is formed so as to be continuous with the handle grip 7, The inner side of the operating body 4b or the brake bracket 8
And a gear shifting operation mechanism 14 configured on the inner peripheral portion of the base end portion of the.

The tubular operating body 4b is rotatable on the outer periphery of a cylindrical sleeve body 15 fixedly fitted on the outer periphery of the handle bar 2 on the axially outer side of the base end portion of the brake bracket 8. Being overfitted. The cylindrical operation body 4b
Is composed of a gripping operation part 16 that is gripped and rotated by a passenger, an inner cable t1 formed on the inside of the gripping operation part 16 in the vehicle width direction, and an outer cable t2 inserted into the inner cable t1. Reel portion 17 that winds the inner cable t1 of the gear shift operation cable T that is to be operated, and a claw accommodating portion 28 that accommodates a ratchet pawl 29 of a ratchet mechanism 25 described later.
It is generally configured with and.

A rubber outer jacket 19 is fitted on the outer circumference of the gripping operation portion 16 so that a passenger can easily grip it, and the handle grip 7 and the outer circumference thereof are formed to be substantially continuous. Has been done. Then, while the tubular operation body 4b or the handle grip 7 is gripped, the gear shift operation can be performed while the handle operation is performed.

FIG. 2 shows a shift operating device 5b according to this embodiment.
3 is an enlarged sectional view taken along the central axis of the gear shift operating device 5b. In this embodiment, the shift operation cable T is fixed to the fastening bolt 18 provided on the base end portion of the brake bracket of the outer cable t2, and the inner cable t1 is attached to the upper surface of the base end portion of the brake bracket 8. The provided reel body 20 changes the pulling and feeding direction, and then the reel body 17 is wound around the reel portion 17 of the tubular operation body 5b.

As shown in FIGS. 2 and 4, the reel body 20 is rotatably supported by a support shaft 21 provided on the upper surface of the base end portion of the brake bracket 8 and extends along the handlebar 2. The tubular operation body 4b in which the inner cable t1 of the guided speed change operation cable T is fitted to the handlebar 2
It plays a role of converting to the direction toward the outer circumference.

The inner cable t1 whose direction is changed by the reel body 20 has a nipple 22 provided at the tip thereof along the reel winding groove 17a of the reel portion 17 of the tubular operating body 4b. Nipple locking hole 23
It is fixed to the tubular operation body 4b by being housed in the.

As shown in FIGS. 1 and 4, in the present embodiment, when the right cylindrical operating body 4b is pivoted so that the upper surface thereof moves rearward (in the direction of arrow P), the gear shifting operation cable is moved. The T inner cable t1 is configured to be pulled, and the other end of the inner cable t1 is connected to the rear transmission 1b. A locking mechanism 24 for restricting the rotation of the tubular operating body 4b is provided inside the tubular operating body 4b in the vehicle width direction.

The locking mechanism 24 according to the present embodiment includes a ratchet mechanism 25 for holding the tubular operating body 4b at a desired rotating position when the tubular operating body 4b pulls the inner cable t1. The inner cable t1 wound around the reel portion 17 of the tubular operating body 4b is composed of a resistance applying means 26 for applying a frictional force so as not to be unnecessarily paid out by the tension of the return spring on the transmission side. As shown in FIG. 3, the locking mechanism 24 is formed inside the tubular operating body 4b in the axial direction, and the ratchet wheel 2 is a locking body that is rotated together with the tubular operating body.
A sleeve 7 is rotatably fitted onto the outer circumference of the sleeve body 15.

The ratchet wheel 27 is formed on the outer periphery in the vehicle width direction and has engaging tooth portions that engage with ratchet pawls 29 accommodated in pawl accommodating holes 28 provided at the inner end of the tubular operating body 4b. 30 and a resistance applying portion 3 provided on the outer peripheral portion in the axial direction of the engaging tooth portion 30 and providing a predetermined rotation resistance to the rotation of the tubular operating body 4b in the cable feeding direction.
1 and.

Engaging tooth portion 3 of the ratchet wheel 27
As shown in FIG. 5, an engaging claw 32 in one direction is formed at 0, and when the tubular operating body 4b is rotated in the cable winding direction (arrow P direction) as shown in FIG. The ratchet pawl 29 accommodated in the pawl accommodating hole 28 of the tubular operating body 4b floats outward in the radial direction to permit relative movement between the ratchet wheel 27 and the tubular operating body 4b, while the cable feeding direction When the tubular operation body 4b is rotated in the (arrow Q direction), the ratchet pawl 29 and the ratchet wheel 27, which are elastically biased radially inward by the ring-shaped spring 29a, as shown in FIG. Claw 32
Are engaged with each other, and the tubular operation body 4b and the ratchet wheel 27 are integrally rotated.

On the other hand, as shown in FIGS. 3 and 7, the resistance imparting portion 31 of the ratchet wheel 27 imparts a predetermined rotational resistance to the ratchet wheel 27.
A friction band 33 is provided as a friction member.

The friction band 3 according to the present embodiment.
As shown in FIG. 7, a strip-shaped leaf spring member 3 is formed by press molding into a substantially annular shape, and a plurality of arc-shaped sliding contacts 3 are slidably contacted with the outer peripheral surface of the resistance applying portion 31 of the ratchet wheel 27. A plurality of joint portions integrally formed between the end portions of the portion 33a and the adjacent sliding contact portions 33a, bulged outward in the radial direction in a convex shape, and separated from the outer peripheral surface of the resistance applying portion 31. 33b and a pair of tightening portions 3 that extend outward in the radial direction from the end of the sliding contact portion 33a so as to face each other substantially in parallel and are brought close to each other by the tightening means 50.
3c. The inner peripheral surface of the sliding contact portion 33a is formed in an arc shape corresponding to the outer peripheral surface of the resistance applying portion 31. On the other hand, the joint portion 33b has the sliding contact portion 33a.
Is formed so as to bulge outward in the radial direction with a curvature larger than the curvature of, and the inner surface thereof is separated from the outer peripheral surface of the resistance applying portion 31. In addition, the tightening portion 3
Through holes 34a, 3c for inserting and inserting the tightening and tightening bolts 34 constituting the tightening means 50 into the 3c, 33c.
4b are formed respectively. Then, the tightening bolt 34 and the tightening nut 35 screwed to the tightening bolt 34 bring the pair of tightening portions 33c, 33c close to each other to tighten the outer periphery of the resistance applying portion 31 to the ratchet wheel 27. It is configured to be able to provide rotation resistance.

The tightening portions 33c, 33c are projected into a space provided at the base end portion of the brake bracket 8, and the tightening portions 33c, 33c or the tightening bolts 34 connected to the tightening portions 33c, 33c are provided on the inner wall of the space. It is configured so as not to rotate together with the ratchet wheel 27 by coming into contact with the portion. The friction band 33 is formed by the frictional force generated between the inner peripheral surface of the arcuate sliding contact portion 33a and the outer peripheral surface of the resistance applying portion 31a.
A predetermined rotation resistance is applied to the ratchet wheel 27 that is rotated together with the tubular operating body. That is, by adjusting the facing distance between the tightening portions 33c, 33c by the tightening bolt 34 and the tightening nut 35, the sliding contact portion 33a is made to contact the resistance applying portion 31.
The ratchet wheel 27 can be provided with a predetermined turning resistance by adjusting the tightening force for tightening. Usually, the rotation resistance is
It is set so as to overcome the tension of the inner cable t1 given by the return spring of the rear transmission 1b.

Further, in this embodiment, as shown in FIG. 3, a ratchet mechanism 36 for engaging and disengaging in the axial direction of the handlebar 2 is provided at the inner end portion of the ratchet wheel 27. The ratchet mechanism 36
Is a claw portion 37 formed on the inner end surface of the ratchet wheel 27, a spring 39 housed in a claw housing hole 38 formed at the base end portion of the brake bracket 8, and a spring force biased by this spring 39. And a ratchet claw 40.

By the ratchet mechanism 36, the pawl portion 3 is rotated during the turning operation in the cable feeding direction.
The ratchet sound is generated by the engagement and disengagement of the ratchet claw 40 and the ratchet claw 40 so that the occupant can confirm the shift operation.

Hereinafter, the operation of the shift operating device 5b having the above structure will be described. When the tubular operating body 4b is rotated so that the upper surface of the tubular operating body 4b moves rearward (in the direction of arrow P in FIG. 1), the inner cable t1 is connected to the reel portion 17 of the tubular operating body 4b as shown in FIG. Winded up, inner cable t
1 is towed.

At this time, as shown in FIG. 6, the ratchet pawl 29 held at the inner end of the tubular operating body 4b in the vehicle width direction is moved radially outward of the ratchet wheel 27 against the elastic force of the ring-shaped spring 29a, as shown in FIG. Float up towards you. Then, relative rotation is performed while sliding on the engagement tooth portion 30, and the rotation resistance given to the resistance applying portion 31 does not act on the cylindrical operation body 4b.

When the turning operation of the tubular operating body 4b is stopped at the desired turning position, as shown in FIG. 5, the tension of the inner cable t1 given by the return spring of the rear transmission 1b and the ring-shaped spring 29a. The ratchet pawl 29 and the engaging tooth portion 30 mesh with each other due to the elastic force of, and the tubular operation body 4b and the ratchet wheel 27 are attempted to rotate integrally. However, the rotation is blocked by the frictional force applied by the friction band 33 wound around the resistance applying portion 31 of the ratchet wheel 27, and the inner cable t1 corresponds to the rotational position of the tubular operation body 4b. The inner cable t1 is locked in the towed position and is not unnecessarily paid out. Therefore, the inner cable t1 can be pulled and held by a desired amount.

On the other hand, when the cylindrical operation body 4b is rotated so that the upper surface thereof moves forward (in the direction of arrow Q), the cylindrical operation body 4b is operated while the ratchet pawl 29 and the engaging tooth portion 30 are meshed with each other. The body 4b and the ratchet wheel 27 are integrally rotated. At this time, a certain rotation resistance is imparted by the friction band 33 wound around the resistance imparting portion 31, but the force required to rotate the tubular operating body 4b is applied by the friction band 33. Since the tension obtained by subtracting the tension of the inner cable t1 from the rotation resistance is required, the rotation operation force is reduced and the inner cable t1 can be easily fed out.

With the above structure, by rotating the tubular operation body 4b, the inner cable t1 can be pulled or extended to perform a gear shift operation. Further, since the friction band 33 imparts a constant rotation resistance, the tubular operating body 4b is rotated by the tension of the inner cable t1 by the return spring of the rear transmission 1b, and the inner cable t1 is erroneously rotated. It will not be paid out.

Moreover, in this embodiment, since the ratchet mechanism 36 is formed on the end surface of the ratchet wheel 27, ratchet noise is generated even when the inner cable is fed out, and the occupant can surely perform the gear shifting operation. It is possible to confirm that.

Now, the friction band 33 which constitutes the resistance applying means 26 according to the present embodiment includes the resistance applying portion 3 described above.
1. A plurality of arcuate slidable contact portions 3 slidably contacted along the outer periphery of
3a is provided, and a joint portion 33b that is bulged outward in the radial direction and is spaced apart from the outer peripheral surface of the resistance applying portion 31 is provided between the ends of the adjacent sliding contact portions 33a. There is. By providing the joint portion 33b, each sliding contact portion 33a is easily elastically displaced with the joint portion 33b as a node, and a greater spring property is imparted as compared with the conventional simple annular friction member. For this reason, the pair of tightening portions 33c, 33c that extend substantially parallel to the outside in the radial direction from the ends of the adjacent sliding contact portions 33a are brought close to each other by the tightening bolts 34, so that the entire friction band 33 is closed. It becomes possible to store the elasticity over the circumference.

As a result, it is possible to set a large adjustment allowance for the tightening portions 33c, 33c that are tightened and adjusted by the tightening bolt 34 and the tightening nut 35. Therefore, the adjustment range of the rotation resistance is greatly expanded, and fine adjustment is possible. Also, each sliding contact portion 33a
However, since the joint portion 33b can be easily elastically displaced using the joint portion 33b as a node, the ratchet wheel 27 can be brought into sliding contact with the outer peripheral surface of the ratchet wheel 27 with a uniform pressing force. Therefore, it is possible to give a stable turning resistance to the ratchet wheel 27 and set an optimum turning resistance. As a result, the operability of the shift operating device is significantly improved. Further, since the tightening bolts 34 for bringing the tightening portions 33c, 33c close to each other can be arranged in the direction perpendicular to the axis of the friction band 33, the axial dimension of the speed change operation device does not increase.

Further, since the friction band 33 according to the present embodiment is constructed so as to be brought into sliding contact with the outer peripheral surface of the ratchet wheel 27, it is fitted to the handlebar as in the present embodiment. It can also be easily adopted in a gear shift operation device having a tubular operation body 4b.

Furthermore, as shown in FIG. 7, since a gap is formed between the inner surface of the joint portion 37b and the outer peripheral surface of the resistance applying portion 31, it is possible to hold grease in this gap. Becomes Therefore, it is possible to prevent wear between the friction band 33 and the resistance applying portion 31 for a long period of time, and it is also possible to maintain the performance of the speed change operation device for a long period of time.

The scope of the present invention is not limited to the above embodiments. In the embodiment, as the gear shift operation body,
The invention of the present application is applied to the gear shift operation device including the tubular operation body 4b rotatably fitted to the end portion of the handlebar, but the lever shaft provided on the frame proper portion is rotatably operated. The invention of the present application can also be applied to a gear shift operation device having a gear shift operation lever fitted therein.

Although the ratchet mechanisms 25 and 36 are provided in the embodiment, the friction band 33 may be used alone to form the friction applying mechanism. Furthermore, the transmission mechanism to which the present invention is applied is also a rear derailleur,
The invention is not limited to the external transmission mechanism such as the front derailleur, but may be applied to other transmission mechanisms such as the internal transmission mechanism.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a gear shift operating mechanism including a gear shift operating device to which the present invention is applied.

FIG. 2 is a plan view of a right gear shift operation device that operates a rear transmission.

3 is a cross-sectional view taken along the axis of the shift operating device of FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along the line VV in FIG.

FIG. 6 is an explanatory diagram illustrating an operation of the ratchet mechanism shown in FIG.

7 is a sectional view taken along the line VII-VII in FIG.

[Explanation of symbols]

 4a, 4b Shift operating body (cylindrical operating body) 5a, 5b Shift operating device 24 Locking mechanism 33 Friction member (friction band) 33a Sliding contact part 33b Joint part 33c Tightening part

Claims (1)

[Claims] 1. A shift operating body, which is rotatably supported on an appropriate portion of a bicycle frame, and a locking mechanism that locks the shift operating body at a predetermined rotation position. In a bicycle gear shift operation device configured such that a transmission main body is operated by a gear shift operation cable that is pulled or extended by a turning operation, the locking mechanism has a cylindrical outer peripheral surface, and The friction member is configured to rotate together with the operating body, and includes a substantially annular friction member that is fitted on the locking body and provides a predetermined rotation resistance to the locking body. The member is integrally formed between a plurality of arcuate slidable contact portions that are slidably contacted with the outer peripheral surface of the locking body, and end portions of the slidable contact portions that are adjacent to each other, and are bulged outward in the radial direction. A plurality of members that are separated from the outer peripheral surface of the locking body. A bicycle for bicycles, characterized by comprising a node portion and a pair of tightening portions which extend outward in the radial direction from the end portion of the sliding contact portion so as to face each other substantially in parallel and which are brought close to each other by tightening means. Gear change operation device.