JPH036037B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bicycle gear shift operating device, more specifically, it is composed of a gear shift lever and a derailleur, and operates the derailleur by operating the gear shift lever, and operates a drive chain that is hung on the chain guide of the derailleur. The present invention relates to a bicycle gear shift operating device that changes gears by changing gears to one sprocket of a multi-stage sprocket.

More specifically, the derailleur is constituted by a base member, two link members, and a movable member having a chain guide, and the four-link mechanism consisting of the four members is operated by the operation wire by the shift lever. The movable member is moved relative to the base member, the drive chain is moved in the axial direction of the multi-stage sprocket by a chain guide provided on the movable member, and the chain is replaced with one of the multi-stage sprockets to change the speed. The present invention relates to a bicycle gear shift operating device that performs the following operations.

Generally, this type of gear shift operating device has a gear shift lever with a
A rotational resistance that overcomes the return spring is applied to stop the chain guide at a predetermined position and maintain a predetermined gear position.

By the way, when the gear position is set using the operating lever, the movement of changing the chain on the derailleur is not transmitted to the driver, so conventionally,
A positioning plate having a number of recesses corresponding to the number of gears is provided on one of the four structural members constituting the quadruple link mechanism, and another member that moves relative to this member is provided with the recesses. holding a locking body that engages with the recess, and during a gear shifting operation, the locking body engages with one of the recesses to determine a gear shift position, and the locking body engages with the recess. It has been proposed that the movement of the chain change in the derailleur can be read based on the sense of a click.

However, when changing gears using the operating wire, especially when pulling the operating wire to change the chain from a small diameter sprocket to a large diameter sprocket, it is difficult for the operator, especially an inexperienced operator, to change the chain from a small diameter sprocket to a large diameter sprocket, despite the presence of a positioning mechanism. In some cases, the operation may be stopped before the set position or beyond the set position without accurately matching the position set by the positioning mechanism. If the chain stops near the boundary between the recessed parts without accurately engaging with the recessed part, the chain guided by the chain guide may come into contact with the sprocket to be replaced during the replacement, or the chain may The sprocket meshes with the sprocket in a biased manner, resulting in noise and unexpected wear of the sprocket and chain.

Therefore, it has been desired to be able to automatically change the chain to the sprocket, without the chain remaining in contact with the sprocket, even if the gear change operation is done incorrectly, such as by over or under the amount. be.

The present invention has been devised in view of the above points, and the purpose is to prevent the number of gears from being read by the click feeling provided by the positioning mechanism, but if the operation wire is operated incorrectly and the amount of operation is excessive or To provide a speed change operation device capable of replacing a chain with a sprocket even when there is a shortage.

Accordingly, the present invention provides a bicycle speed change operation device comprising a speed change lever and a derailleur. The lever body is interlocked with the rotating body through a predetermined free movement interval, and the derailleur has a four-link mechanism comprising a movable member having a base member, two link members, and a chain guide; a positioning mechanism for setting the position of the chain guide, and supporting the wire or an outer cylinder for guiding the wire on a relative movement member that moves relative to each other independently of the two members provided with the positioning mechanism. , this relative motion member;
A return spring is interposed between the other member that moves relative to the member, and the relative moving member that moves relative to the two members provided with the positioning mechanism moves relative to the member. The member is movable within a certain range, and after the relative movement member is moved within a certain range by operating the lever main body, the movable member is moved forward or backward relative to the base member to operate the positioning mechanism. It is characterized by this.

That is, the present invention provides a shift operating device in which a derailleur is equipped with a positioning mechanism, in which when operating the shift lever, if the amount of operation is too large and the chain comes into contact with the sprocket that has been replaced, an overshift occurs. In this case, use the return spring to
If the chain is in contact with the sprocket due to the forced movement of the movable member and the amount of operation is insufficient, in other words, if the chain is overless, the chain tension caused by the chain drive is used to move the chain. By forcibly moving the member, the chain can be reattached to the sprocket.

Embodiments of the present invention will be described below based on the drawings.

The device of the present invention comprises a gear shift lever L and a dayrailer D.
First, an embodiment of the speed change lever L will be explained based on FIGS. 1 and 2.

In Figures 1 and 2, 1 is the frame F of the automobile.
Alternatively, it is a fixing member that is attached to a handlebar or the like using a tightening band 2. This fixing member 1 holds a cylinder shaft 3 having a screw 3a on the inner circumference and a flat part 3b on the outer circumference.

Further, reference numeral 4 denotes a friction rotating body rotatably supported on the cylinder shaft 3 with a predetermined rotational resistance, and the one shown in FIG. 1 is made of a cylinder. This rotating body 4
The rotational resistance is determined by the fact that a pressure plate 5 is supported non-rotatably on the cylinder shaft 3 via the flat part 3b, and an upper plate 6 is fixed to the fixing member 1 and made non-rotatable on the pressure plate 5. By screwing the adjustment screw body 7 screwed into the screw 3a of the cylinder shaft 3, the pressing plate 5 is brought into contact with the rotating body 4 via the upper plate 6, and the rotating body 4 is fixed. The rotational resistance is provided by being held between the member 1 and the pressing plate 5, and the rotational resistance is set to a value that overcomes the return spring of the derailleur, which will be described later, by adjusting the threaded body 7. be.

In addition, 8 is a washer.

Reference numeral 9 denotes a lever body which is freely rotatably supported on the cylindrical shaft 3 via the rotary body 4, and a bearing hole that matches the outer diameter of the rotary body 4 is provided at the center of the boss portion of the lever body 9. , an annular inner chamber 9a continuous to the bearing hole, and a locking groove 9b extending radially outward is provided on one side of the inner chamber 9a.

Further, one end of the operating wire W is locked near the boss portion of the lever body 9.

However, the lever body 9 is operatively connected to the rotating body 4, and the lever body 9 shown in FIGS. 1 and 2 uses a crank spring 10.

This crank spring 10 is wound around the outer periphery of the rotating body 4, one end of which is locked in the locking groove 9b of the lever main body 9, and the other end is wound around the rotating body 4 so as to be able to slide freely. .

When the clutch spring 10 pulls the operating wire W in the X direction in FIG. When the operating force is released, the force of the return spring acts on the lever body 9 via the wire W, and the lever body 9 is tightened around the rotating body 4. By this tightening, the lever body 9 is rotated. The lever body 9 is integrated with the body 4, and the return rotation is prevented by the rotational resistance applied to the rotary body 4, so that the lever body 9 is maintained immovably at its operating position. Further, when the lever main body 9 is rotated in the same direction as the return spring (Y direction in FIG. 2), the tightening force of the clutch spring 10 increases and rotates together with the rotating body 4, By reaching a predetermined operating position and releasing the operating force on the lever body 9, the lever body 9 is maintained immovably at that position.

What is shown in FIGS. 1 and 2 further differs from the circumferential width of the locking groove 9b in the above configuration to the width dimension at the bent end 10a of the clutch spring 10 that locks in the locking groove 9b. A gap d is formed between the locking groove 9a and the bent end 10a of the clutch spring 10, and this gap d allows the lever body 9 to rotate freely relative to the rotating body 4. .

Therefore, when the wire W is towed by the lever body 9, the lever body 9 can be rotated back by a certain amount relative to the amount of traction when the operating force is released.

This return rotation amount is such that during a gear change operation, the chain shifts to one side in the thickness direction of the large-diameter sprocket that has been replaced, contacts the adjacent sprocket, and then returns to the center side in the thickness direction of the sprocket that has been replaced. The amount of movement required to do this should be the same.

Next, an embodiment of the derailleur D constituting the device of the present invention will be described based on FIGS. 3 to 8.

What is shown in the drawing is a rear derailleur, and its basic structure is as shown in Figures 3 and 4.
A quadruple link mechanism A pivotally supported on the fixed member 11, that is,
Two link members 1 parallel to the base member 12
It is constituted by a quadruple link mechanism A consisting of four members: 3, 14 and a movable member 15, and the fixed member 11 is fixed to the fork end of the bicycle, and the quadruple link mechanism A The base member 12 has a horizontal axis 16 attached to the fixed member 11.
It is supported so that it can swing freely.

The base member 12 is provided with a pair of mounting pieces facing each other on one side, and the link members 13 and 14 are pivotally connected to these mounting pieces via a pair of pins 17 and 18. At the free ends of the link members 13, 14, a pair of pins 19,
20, the movable member 15 is pivotally mounted.

This movable member 15 has a similar shape to the base member 12, and has mounting pieces facing each other on one side thereof, and the two pins 19, 2 described above on the mounting piece.
0 is attached to the link members 13 and 14 so that they can swing together, and the horizontal shaft 16 is attached to the other side.
A chain guide 23 having a guide pulley (not shown) and a tension pulley 22 is mounted rotatably within a certain range via a horizontal shaft 21 extending in the same direction as the link members 13 and 14. Due to the movement, the movable member 15 moves to the base member 1.
2, it moves in parallel between the high speed position and the low speed position shown in FIG.

The chain guide 23 attached to the movable member 15 includes the guide pulley and tension pulley 22, and a hanging frame 24 that rotatably supports these pulleys. 15, and is rotatably supported via a horizontal shaft 21. The rotation range of the hanging frame 24 is restricted by a stopper 25, and is biased clockwise in FIG. 3 by a tension spring 26 wound around the horizontal shaft 21. The tension spring 26 is for applying tension to the chain guided by the guide pulley and the tension pulley 22, and the force of the tension spring 26 causes the movable member 15 to move in the direction of the low speed position. You will be given the power to

Further, the quadruple link mechanism A configured as described above is provided with a return spring 27 to urge the chain guide 23 toward the small diameter sprocket, and has recesses 28 of the same number as the number of gear positions. The recessed part 2
A positioning mechanism 30 is provided which includes a locking body 29 that engages with any one of the locking bodies 8.

However, in the embodiment shown in FIGS. 3 to 8, in the known derailleur configured as described above, one link member 13 in the quadruple link mechanism A is
An operating arm 31 that swings independently of the quadruple link mechanism A is supported on the pin 17 which is pivotally supported on the base member 12, and the operating wire W or the wire W is connected to the free end of the arm 31. In addition to supporting the outer cylinder O to be guided, the return spring 27 is interposed between the operation arm 31 and the base member 12 of the quadruple link mechanism A, and one end of the spring 27 is used for the operation. While urging the operating arm 31 counterclockwise in FIGS. 4 and 6 by bringing the other end into contact with a stopper 31a protruding from the arm 31 and a stopper 12a protruding from the base member 12, The link members 13, 14
to the pins 17 and 18 that are pivotally supported on the base member 12,
A positioning plate 33 having a recessed portion 28 of the positioning mechanism 30 and an arcuate guide hole 32 centered on the pin 17 is attached, and the energy storage plate 34 is swingable on the pin 17 that supports the operating arm 31. The positioning mechanism 3 is supported on the energy storage plate 34.
0 locking body 29 and an engagement pin 35 extending in the same direction as the pin 17, and between the energy accumulating plate 34 and the link member 13, the energy accumulating plate 34 is connected to the link member 13. A control hole is provided with an energy storage spring 36 that urges the operating arm 31 to the side, receives the engaging pin 35 in the operating arm 31, and allows the operating arm 31 to move only within a certain range with respect to the engaging pin 35. 37, through which the engagement pin 35 is inserted;
The positioning mechanism 20 is configured to operate after the operating arm 31 has moved within a certain range.

In the above configuration, the operation arm 31 is
One end of the pin 17 is extended outward and fixed to the extended end so that it can swing together with the pin 17, and one end of the operating wire W is attached to the free end of the operating arm 31 using a fixing device. 38, and by operating the operating wire W, the return spring 27 is bent, and the operating arm 31 is made to swing. Further, the operation arm 3
As shown in FIG. This is done so that only the same range as range d is moved. It should be noted that the control hole 37 may be formed as an arcuate long hole centered on the pin 17, or may be formed as a concave notch. , it is only necessary that the engagement pin 35 be moved within a certain range.

Further, the positioning plate 33 is connected to the quadruple link mechanism A.
, and its intermediate portion is connected to the pin 17,
18, and this positioning plate 33
One end is oriented toward the movable member 15 side, the recessed part 28 is provided on the inner surface of the end, and the other end is made to stand up, and the outer cylinder O is placed in this upright part.
is supported via the support 39.

Furthermore, the energy accumulating plate 34 prevents the operation wire from moving even when the shift resistance acting during the shift operation is greater than the normal resistance, that is, the shift resistance when the chain is moving, such as when the chain is not moving. By operating W, the four-link mechanism A is swung together with the operating arm 31 to switch to a desired gear position in advance, and when the large gear shift resistance is released, that is, when the chain starts to move,
The movable member 15 is moved to the gear position set by the positioning mechanism 30 by the restoring action of the energy storage spring 36. In the case of normal gear shift resistance, the energy storage spring 36 moves the movable member 15 to the gear position set by the positioning mechanism 30. It oscillates as one. Therefore, the energy storage plate 34 is not necessarily required.

Further, a plurality of recesses 28 of the positioning mechanism 30 are provided at predetermined intervals along the swing locus of the link members 13 and 14 that are displaced during gear shifting and according to the amount of movement of the link members 13 and 14. Also, the locking body 29 is formed of a rolling element,
The spring 40 biases the recessed portion 28 in the direction.

Incidentally, reference numeral 41 in the figure is an adjustment screw for adjusting the position of the chain guide tool 23 set by the positioning mechanism 20 with respect to the base member.

Next, the operation of the shift lever L and derailleur D constructed as above will be explained.

4 and 6, the movable member 15 is in a high speed position, and when the operating wire W is pulled from this state by operating the gear shift lever L, the lever body 9 first moves in the gap d. In addition to free rotation within the free rotation range set by
The return spring 27 that is in contact with one end of the operating arm 31 of the derailleur D is bent, and the operating arm 3
1 swings within the swing range set by the control hole 37, specifically within the same range as the free rotation range of the lever body 9, as shown in FIG. Free rotation range of this lever body 9 and operation arm 31
Although the movable member 15 does not move within the swing range of , the return spring 27 is disconnected from the link member 13 due to the swing of the operating arm 31, and as a result, the movable member 15 It is now possible to move freely toward the large diameter sprocket with respect to the base member 12, and when the operating force of the lever body 9 is released, the lever body 9 is moved toward the operating wire W by the restoring force of the return spring 27.
This means that the vehicle can return in the opposite direction to the direction of traction.

Next, with the lever body 9 rotated within the free rotation range, when the lever body 9 is further rotated and the operating wire W is pulled, the clutch spring 10
is bent and separated from the rotating body 4, and the end of the control hole 37 provided in the operating arm 31 is connected to the engaging pin 3.
5, from then on, the energy accumulating plate 34 and the link members 13, 14 follow the swinging motion of the operating arm 31, and due to this following swinging motion, the movable member 1
5 moves toward the larger diameter sprocket, and the positioning mechanism 30 is activated. In the case of an overless chain guide tool in which the operation is stopped halfway when the locking body 29 of the positioning mechanism 30 crosses the boundary between two adjacent recesses 28 and crosses over to the next adjacent recess. Although the chain guided by 23 contacts the large diameter sprocket, it cannot be replaced with the sprocket, and when the pulling operation of the operating wire W is stopped as described above, in the conventional derailleur, the positioning mechanism 30 is locked. The body 29 does not accurately engage with the desired recessed portion 28, but stops at a position beyond the boundary between the recessed portions 28 toward the desired recessed portion 28a, as shown by the imaginary line B in FIG.
The chain remains in contact with the sprocket, and the contact of the chain with the sprocket causes noise. However, in the configuration described above, the movable member 15 is in a free state, so the chain remains in contact with the sprocket. Even if the operation of the operation wire W is stopped, the movable member 15 moves within the swing range to the sprocket to be replaced due to the chain driving force acting on the chain. . Therefore, the chain that comes into contact with the large diameter sprocket is caught on the teeth of the large diameter sprocket, and is lifted and reliably replaced with the sprocket. And at this time the 8th
The locking body 29 of the positioning mechanism 30 is shown as a solid line in the figure.
The chain guide 23 can be accurately engaged with the desired recess 28, and the chain guide 23 can be placed at the position set by the positioning mechanism 30.

Also, when changing gears by towing the operating wire W,
When the locking body 29 of the positioning mechanism 30 stops pulling the operating wire W at a position where the locking body 29 of the positioning mechanism 30 crosses the trough of the desired recess 28a toward the next recess, that is, when overshifting occurs, the lever body 9 When the operating force is released by manually releasing the derailleur, in the conventional derailleur, the locking body 29 of the positioning mechanism 30 does not accurately engage with the desired recessed portion 28a, and the desired position as shown in the temporary window line C in FIG. A valley part of the recessed part 28a,
The chain stops at an intermediate position between the next recessed part and the boundary, and the chain guided by the chain guide 23 remains in contact with the adjacent large diameter sprocket, and the contact of the chain with the sprocket causes noise. However, in the configuration described above, the lever body 9 is capable of return rotation within the range of the gap d, so the lever body 9 is rotated due to the restoring force of the return spring 27 of the derailleur D. Return rotation occurs within the range of the gap d, and as a result, the movable member 1
5, due to the restoring force of the return spring 27, the lever main body 9 is moved back toward the small diameter sprocket within the return rotation range, and the locking body 29 of the positioning mechanism 30 is also moved into the desired recess as shown by the solid line in FIG. Accurately engages with the entry portion 28 to move the chain guide 23 to the positioning mechanism 30.
You can place it in the position you want.

The configuration described above can be modified as follows.

First, a clutch spring 10 is used to connect the lever body 9 of the gear shift lever L and the friction rotating body 4, but the rotating body 4 is divided in the middle as shown in FIGS. A disc 50 having an engaging protrusion 50a that engages with the groove 9b may be interposed to provide the disc 50 with the same rotational resistance as the rotating body 4, or the disc 50 may be provided with the same rotational resistance as the rotating body 4. It may be integrally connected to the body 4.

Further, the amount of return rotation of the lever body 9 is determined by providing the lever body 9 with a screw body 51 that projects into the locking groove 9b, as shown in FIG. 11, and adjusting the gap d by adjusting the screw engagement of this screw body 51. This allows you to set it freely.

In addition, in the derailleur D, in the above-mentioned embodiment, the operating arm 31 that swings independently of the quadruple link mechanism A and the heat storage plate 34 that is swingable integrally with the link member 13 are used. 34 and a positioning plate 33 fixed to the base member 12, a positioning mechanism 30 is provided, an operating arm 31 is supported on the pin 17 on the base member 12 side, and a positioning mechanism 30 is provided between the operating arm 31 and the base member 12. In addition to interposing the return spring 27, the operating arm 31
Although a control hole 37 is provided in the control hole 37 and an engaging pin 35 that is inserted through the control hole 37 is provided in the energy accumulating plate 34, other configurations may be made as shown in FIGS. 12 to 22.

What is shown in FIGS. 12 and 13 is the base member 1.
A positioning mechanism 30 is provided between the pin 2 and the energy storage plate 34 which is pivotally supported on the pin 17, and the other configurations are the same as those shown in FIGS. 3 and 4. In this case, the positioning plate 33 with the recessed part 28
is provided on the energy storage plate 34, and a holding cylinder 42 holding the locking body 29 is provided on the base member 12.

Further, in the structure shown in FIGS. 14 and 15, a positioning mechanism 30 is provided between the base member 12 and the link member 13, and the energy storage plate 34 is pivotally supported on the pin 18 on the base member 12 side. This storage board 34
The outer cylinder O is supported in this case. In this case, a positioning plate 33 having the recessed portion 28 is provided on the base member 12, a holding cylinder 42 holding the locking body 29 is provided on the link member 13, and the positioning plate 33 is provided with the above-mentioned engagement plate 33. A guide hole 32 for a pin 35 is provided.

16 and 17, the operating arm 31 is supported by the pin 20 on the movable member 15 side, and a return spring 27 is interposed between the operating arm 31 and the movable member 15. At the same time, the outer cylinder O is supported on the operating arm 31, and the energy accumulating plate 34 and the holding plate 43 are supported on the pin 20, and positioned between the holding plate 43 and the movable member 15. In addition to providing the mechanism 30, the retaining plate 4
3 and the energy storage plate 34 are interlocked by the engagement pin 35. In this case, the positioning plate 33 having the recessed portion 28 is moved to the movable member 15.
A holding cylinder 4 that is integrally formed with the locking body 29 and holds the locking body 29
2 is attached to the holding plate 43, and the positioning plate 33 has a guide hole 32 for the engaging pin 35.
has been established.

18 and 19 do not require the energy storage plate 34, and a positioning mechanism 30 is provided between the base member 12 and the link member 13, and the engagement pin is provided on the link member 13. 35. In this case, the positioning plate 33 having the recessed portion 28 is formed integrally with the base member 12, and the holding cylinder 42 holding the locking body 29 is attached to the link member 13.

If the energy storage plate 34 is not used, the operating arm 31 is supported by the pin 20 on the movable member 15 side, and a return spring 27 is installed between the operating arm 31 and the movable member 15, although not shown. In addition to intervening,
A positioning mechanism 30 may be provided between the link member 14 and the movable member 15, and the outer cylinder O may be supported on the operating arm 31 and the operating wire W may be supported on the movable member 15, or , a positioning mechanism 30 is provided between the link members 13 and 14, and other configurations are provided between the link members 13 and 14.
The configuration may be similar to that in FIG. 9.

Further, in the case shown in FIGS. 20 and 21, the operating arm 31 is not required, and the operating wire W is fixed to one of the link members 13 and 14 via a fixture 38. , the control hole 37 is provided at the end of the link member 13 on the movable member 15 side, the pin 19 is passed through the control hole 37, and the link member 13 is movable within a certain range with respect to the movable member 15; and a power storage plate 34 is pivotally supported on the pin 18 on the base member 12 side,
The outer tube O is supported on the energy accumulating plate 34 via a support 39, and a positioning mechanism 30 is provided between the energy accumulating plate 34 and the other link member 14, and the pin 18 is also provided with an energy accumulating and a positioning mechanism 30. A return spring 44 is wound around, one end of which is engaged with the inner surface of the intermediate portion of the link member 13, and the other end of which is engaged with a stopper 45 provided on the energy accumulating plate 34. In this case, when the operating wire W is pulled, the second
As shown in FIG. 2, only the link member 13 swings within the swing range set by the control hole 37, and when the operating wire W is further pulled, the end of the control hole 37 hits the pin 19, and from then on The other side link member 14 follows the swinging movement of the one side link member 13, and the positioning mechanism 30 is activated.

In the case of FIGS. 20 and 21, the energy storage plate 3
Line of action Z of operation wire W from oscillation center O ₁ of 4
When the length of the perpendicular line from the pivot point _O2 of the link member 13 to the base member 12 to the line of action Z is L, the length l is such that l<L. and L are set. Therefore,
Now, if the force (moment) of the energy storage/returning spring 44 is M, the energy storage plate 34
The force F ₁ required to overcome 4 and swing is F ₁
= M/l, and the force F ₂ necessary for the link member 13, in other words, the movable member 15 to overcome the spring 44 and move, is F ₂ =M/L, and the lengths l and L is l<L, and the lengths l and L
Since there is almost no change even when the link members 13 and 14 swing, the relationship between the forces F ₁ and F ₂ is always F ₁
> _F2 , and if the shift resistance acting during the shift operation is normal resistance, the link members 13 and 14 will necessarily swing before the energy storage plate 34 swings. A speed change operation can be performed without displacing the energy accumulating plate 34. Further, when the speed change resistance is larger than normal resistance, the energy storage plate 3
4 swings clockwise in FIG. 21 against the spring 44 to store energy in the spring 44, and by releasing the resistance, the desired gear stage can be operated with the stored force.

In addition, when configured as shown in FIGS. 20 and 21,
The control hole 37 may be provided in the link member 14 and the positioning mechanism 30 may be provided between the energy accumulating plate 34 and the link member 13, or the operating wire W may be fixed to the energy accumulating plate 34 and the outer cylinder O , the control hole 37
It may be supported by the link member 13 or 14 on the side where it is provided. Further, the control hole 37 is connected to the movable member 1.
It may be provided on the 5th side.

In addition, in the embodiment described above, the operation arm 31
When using the operating arm 31, the operating arm 31 is connected to the connecting pin 17 or 20 of the member constituting the quadruple link mechanism A.
The pins 17, 18, 1
It may be supported by a pin other than 9 and 20, or
Further, in addition to providing the control hole 37 in the operating arm 31, the engaging pin 35 may be provided in the operating arm 31, and the control hole 37 may be provided in the positioning mechanism 30 side member.

As described above, according to the present invention, when the lever body of the gear change lever is operated to change gears by the derailleur, the gear position can be read by the click feeling provided by the positioning mechanism, and the chain can be changed from a small diameter sprocket to a large diameter sprocket. When replacing the chain, even if the operating wire is manipulated incorrectly and the amount of operation is excessive or insufficient, the chain can be accurately replaced on the sprocket, and noise caused by the chain contacting the sprocket can be avoided. and wear can be eliminated.

In other words, if the amount of shift operation becomes excessive and the chain guide set by the positioning mechanism moves excessively beyond the desired setting position by the positioning mechanism, especially if the chain guide tool is moved excessively by the lever body, You don't have to do any operation to move the lever, just take your hand off the lever body after operation and release the operating force.
The chain guide can be automatically moved back to the desired setting position. Therefore, the chain does not mesh with the sprocket in a biased manner, and the contact between the chain and the sprocket can be eliminated, and noise and wear of the chain and sprocket can be prevented.

Also, if the amount of shift operation is insufficient and the chain guide set by the positioning mechanism does not reach the desired setting position by the positioning mechanism, the chain is not moved enough and the chain is in contact with the sprocket. Alternatively, if the chain is offset and engaged with the sprocket, the movable member is automatically moved by the chain tension acting on the chain by driving the chain, and the chain guide tool is set to the desired setting. It is moved to a certain position. Therefore, the state in which the chain is in contact with the sprocket does not continue, and the contact of the chain with the sprocket causes noise and the chain.
This eliminates sprocket wear.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the gear shift lever of the device of the present invention, and FIG. 2 is a partially cutaway front view showing the interlocking relationship between the lever body and the friction rotating body of the gear shift lever shown in FIG. Figure 3 is a front view showing an embodiment of the derailleur, Figure 4 is its bottom view, Figure 5 is a partially enlarged front view of the derailleur, Figure 6 is its bottom view, and Figure 7 is the operation of the lever body. FIG. 8 is an explanatory diagram showing the positional relationship between the recessed part of the positioning mechanism and the locking body, and FIGS. 9 to 11 are diagrams showing the position of the gear shift lever. Fig. 9 shows a partially cutaway front view corresponding to Fig. 1, and Fig. 10 shows a second embodiment.
11 is a partially cutaway front view corresponding to the figure, FIG. 11 is a partially cutaway sectional view of another embodiment corresponding to FIG.
21 are partially enlarged explanatory views showing another embodiment of the derailleur, and FIG. 22 is an operational explanatory view corresponding to FIG. 21 when the link member is operated with respect to the positioning mechanism. L...Shift lever, D...Day railer, 4...
... Rotating body, 9 ... Lever body, 12 ... Base member, 13, 14 ... Link member, 27 ... Return spring, 30 ... Positioning mechanism, 31 ... Operation arm, W ... Operation wire, O ...Outer tube.

Claims (1)

[Claims] 1. A bicycle gear shift operating device consisting of a gear shift lever and a derailleur, wherein the lever is composed of a freely rotatable lever body supporting an operating wire, and a rotating body that rotates with a predetermined rotational resistance, and the lever The main body is interlocked with the rotating body through a predetermined free movement interval, and the derailleur includes a four-link mechanism consisting of a movable member having a base member, two link members, and a chain guide, and the chain guide. a positioning mechanism for setting the position of the wire, and a relative movement member that moves relative to each other independently of the two members provided with the positioning mechanism supports the wire or an outer tube that guides the wire, and supports this relative movement. A return spring is interposed between the member and another member that moves relative to the member, and the relative moving member that moves relative to the two members provided with the positioning mechanism is moved relative to the member. The movable member is movable within a certain range relative to another moving member, and after the relative movement member is moved within a certain range by operating the lever main body, the movable member is moved forward or backward relative to the base member to operate the positioning mechanism. A bicycle gear shift operating device characterized by being able to operate as if it were a bicycle.