JPS5924032B2 - Bicycle external transmission control lever - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control lever for an exterior transmission for a bicycle, and more specifically, a so-called double-lever type bicycle exterior comprising a rear transmission operation lever and a front transmission operation lever. Concerning improvements to transmission control levers.

Bicycles that require force-type operating levers have multiple (usually 3 to 8) sprockets of different diameters attached to the rear axle of the bicycle, as shown in Figure 4.
...an In addition to the multi-stage freewheel A consisting of a plurality of (usually 2 to 4) different diameter sprockets b1 attached to the crankshaft. It is equipped with a multi-stage chain wheel B consisting of b2...

Furthermore, in order to freely change the chain C to the selected one of these sprockens) al, a2...an and the same selected one of bl, b2..., the freewheel A
A rear derailleur R is provided near the chain wheel B, and a front derailleur F is provided near the chain wheel B. Of the double levers attached to the joints of the bicycle frame, the rear derailleur operating lever L1 and the rear derailleur R are connected to the outer wire W1. and an inner wire w2, and the front transmission operating lever L2 and the front transmission F are also connected via a known operating wire W consisting of an outer wire Wl' and an inner wire w2I. By rotating the lever L1 and moving the guide roller G of the rear transmission R in a direction perpendicular to the running direction of the chain C, the chain C is connected to the sprocket a1. a2...
At the same time, turn the lever L2 to connect the pair of guides "1lp1, p" of the front transmission F.
2 in a direction perpendicular to the running direction of the chain, the chain C is moved to form the chain wheel B.

Change the number of sprockets of multi-stage freewheel A to chainwheel B.
The gearbox is configured to be able to perform gear shifting in a number of stages multiplied by the number of sprockets.

In the above chain changing operation, as shown in Fig. 5,
For example, in the rear transmission R, the chain C is engaged with the smallest diameter sprocket an of the freewheel A, and in the front transmission F, the chain C is engaged with the small diameter sprocket b1 or the large diameter sprocket b2 of the chainwheel B. When the chain C is rotated and moved onto the largest diameter sprocket a1 of the freewheel A, its traveling line is centered around the chainwheel axis, and the width of the freewheel's multi-stage sprocket alta2...an is a part of the arc. The guide plate p1 of the front transmission is displaced as if drawing a fan shape.
The chain C and the chain guide plate p1 come into contact with one end of the inner wall of the chain C and cause not only unpleasant noise but also wear on the chain C and the chain guide plate p1.

Conversely, the chain C, which is meshed with the largest diameter sprocket a1 of the freewheel A in the rear transmission R, and which is meshed with the small diameter sprocket b1 or large diameter tin rocket b2 of the chainwheel B in the front transmission, is moved by moving the lever L1 above. When the chain C is rotated in the opposite direction and moved onto the smallest diameter sprocket an, the chain C comes into contact with one end of the inner wall of the guide plate p2 of the front derailleur, making an unpleasant sound as well, and causing the chain C and the guide plate to It wears out p2.

Tokorochi: In conventional double-lever external bicycle transmission control levers, the front transmission operation system and the rear transmission operation system are functionally completely independent, so the rider cannot operate the rear transmission. If the above-mentioned unpleasant noise occurs as a result of rotating the lever L1 to perform a gear change operation on the freewheel side, immediately rotate the front transmission control lever L2 slightly to prevent the guide plate pl j P2 from coming into contact with the chain C. Other force/force to move in the direction, i.e. in the direction that eliminates the contact sound.

While doing so, if you operate the rear transmission as described above,
The fact that the front transmission must also be operated is problematic in the following respects.

In other words, the amount of rotation of the front transmission control lever L2 to eliminate the above-mentioned contact noise actually requires only a small amount of force, and excessive rotation will result in undesired shift of the subrocket double chain C. .

Therefore, considerable skill is required to accurately perform this delicate rotational operation.

Further, the amount of rotational force of the lever L2 for eliminating the contact sound is reversed due to the force caused by the contact between the contact sound force ζ chain C and the guide plate p1, or by the force caused by the contact with the guide plate p2. However, it is not easy to immediately judge the amount of rotational force by relying only on hearing.

Note that the chain is connected to the guide plate p1. It is possible to visually check which of the forces p2 is in contact with the force ζ.To do so, it is necessary to look downward while driving, which is dangerous.

Furthermore, while driving in a city with a lot of traffic, it is not safe to operate the lever L and the accompanying complex and delicate operations of the lever L2.

An object of the present invention is to provide a double-lever type external bicycle transmission operating lever that eliminates the drawbacks of the conventional example described above. By pushing or returning the outer wire for operating the front transmission, a relative movement is created between the inner wire and the outer wire, and the chain guide plate of the front transmission is slightly moved in the desired direction, thereby automatically suppressing the generation of the contact noise. It is characterized by being configured so that it can be avoided.

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

Reference numeral 1 designates a lever support that is to be fixed to a connecting part of a bicycle frame f via a suitable mounting bracket 2.

The lever support 1 has a pair of support walls 1a and 1b,
Both ends of the lever shaft 30 are supported non-rotatably by these support walls.

After a rear transmission operation lever 4 and a front transmission operation lever 5 are each rotatably attached to the lever shaft 3, the lever shaft 3 is attached to the lever shaft 3 via an appropriate friction member (not shown) provided inside the base end of each lever. The levers 4 and 5 are fixed by an external force, preferably by a known method such as pressing the disk spring-like cover 6 with a screw 7, so that the levers 4 and 5 overcome the tensile elasticity on the transmission side and stop at an arbitrary rotation position. Assemble while providing rotational resistance.

On the outer periphery of the substantially annular base end portion 5a of the front transmission operation lever 5,
A concave groove 8 is provided for guiding the inner wire W2/ to be wound.

Further, an inner wire W 2 is connected to the continuous portion of the base end portion 5a.
/ is provided with a mounting hole 9 for fixing one end thereof.

On the other hand, also on the outer periphery of the base end 4a of the rear transmission operation lever 4,
Groove 1 for guiding the inner wire w2 to be wound
The driving side cam member 11 having a cam surface 11a is provided by engraving 0 and by making the rear side bulge or by attaching a separate member.

A driven cam member 12 that cooperates with the driving cam member 11
For example, there may be a contact portion 14 that abuts the cam surface 11a on the inner surface of a pivot plate 13 that is pivotally attached to the connected portion of the lever support 10 and the support walls 1a and 1b. and configure it.

This contact portion may be a simple inward protrusion or protrusion, but if it is in the form of a rotor 15 as shown, it is possible to avoid undesirable friction between the drive side cam member and the driven side cam member. It's convenient.

Furthermore, a cutout groove or hole 16 is formed in the lower part of the pivot plate 13 at a portion facing the groove 8, through which the front transmission operating inner wire W2' is inserted.

A known tension adjuster 17 having a screw shaft 18 is attached to the periphery of the notched groove 16, and a preferably cylindrical outer wire holder 19 is attached to the screw shaft 18 so that its position can be adjusted. Outer wire Wl for front transmission operation
'Let them accept one side of it.

It should be noted that the tension adjuster 1T may be provided as desired, and it is of course possible to omit this and fix the outer wire holder 19 directly to the periphery of the notch or hole 16. be.

A horizontal plate 20 is provided on the rear side of the lever support 1, and extends parallel to the lever shaft 3 and is located near the back surface of the pivot plate 13. A pair of inner wire insertion holes 21 and 22 are bored at opposing positions, and the inner wires w25w2/ pass through the through holes 21 and 22, respectively, and easily connect to the base ends 4a and 5a of the lever 4.5. so that it is wound up.

Further, a preferably cylindrical outer wire holder 23 is fixed to the peripheral part of the inner wire insertion hole 21 for the rear transmission operation lever among the insertion holes 21 and 22, and the outer wire for rear transmission operation is fixed thereto. Insert one end of W.

Incidentally, the horizontal plate 20 also acts as a stopper that restricts the pivoting plate 13 from pivoting in the counterclockwise direction.

Further, it is convenient if the top portion 13a of the pivot plate 13 acts as a stopper to prevent the levers 4 and 50 from rotating excessively counterclockwise.

In order to prevent the levers 4 and 5 from rotating excessively in the clockwise direction, it is preferable to provide a horizontal rod 25 at a suitable position on the front side of the support body 1 so as to have a stopper function thereon.

In the embodiment shown in FIGS. 1 and 2', the shape of the driving side cam member 11 is such that when the rear transmission control lever 4 is rotated counterclockwise, the driven side cam member 12 is rotated slightly clockwise. However, if the rear transmission control lever 4 is rotated counterclockwise, the driven cam member 12 may also be configured to pivot slightly counterclockwise. is also possible.

= Generally, the springs (not shown) of the front and rear transmissions R and F are:
Since it is incorporated so as to always pull the inner wires W2 and W2' toward the transmission, the outer wires W1 and W1' (rl are pressed toward the lever 4.5 side relative to each other.

Therefore, due to this pressing force, the front transmission outer wire w
The contact portion 14 of the driven cam member 12 that receives the 1/2 end portion 24 is always pressed against the cam surface 11a of the driving cam portion 11.

That is, when the rear transmission operation lever 4 is rotated, the driven side cam member 12, which cooperates with the drive side cam member 11, slightly presses the end portion 24 of the front transmission operation outer wire Wj'. , or release the pressure and insert the inner wire W2
/ and outer wire W1' to cause relative movement.

Next, the operation of the bicycle transmission operating lever according to the present invention will be explained.

FIG. 2 is an explanatory view showing the movement of the barbed driven side cam member 12 and the front transmission operating outer wire W I / when the rear transmission operating lever 4 is rotated, and each lever 4
, 5 is in the state shown in the solid line diagram in FIG. 2, that is, the inner wire W2
2 W2' is in a state of tension due to the tensile elasticity of the transmission side, the chain CH freewheel A
Suitable for bicycles that combine a rear transmission R (so-called top normal type) and a front transmission F (Pfr so-called top normal type) configured to mesh with the smallest diameter sprocket a, chain wheel B, and large diameter sprocket b2. This is an example of a configuration configured to do so (see FIG. 5).

In this case, when the lever 5 is in the state shown by the solid line in FIG. 2, the pair of chain guide plates p1. The wire W' is adjusted in advance so that p2 does not come into contact with the chain C.

In Fig. 2, the lever 4 is now rotated counterclockwise, and the inner wire w2 is wound around the base end 4a of the lever and pulled, thereby meshing with the smallest diameter sprocket an of the freewheel A. When replacing the chain C with the largest diameter chain)al, the chain running line is displaced in a fan shape in the direction of P in Fig. 5, and if the chain guide plate P1el)2 remains in the position shown by the solid line in Fig. 5. and,
The chain C comes into contact with one end of the inner wall of the guide plate p1 and generates an unpleasant contact sound.

However, according to the present invention, when the lever 4 is rotated as described above, the pivot plate 13 interlocked with the lever 4 overcomes the tensile force exerted by the spring on the front transmission side due to the cam action, and rotates clockwise. As a result, the front transmission operation outer wire W11 is slightly pushed toward the transmission F side, that is, in the R direction in FIG.
will be pulled in the S direction in Figure 2.

As a result, the chain guide plate p1iz moves slightly in the p direction to the position shown by the chain line in FIG. 5, and contact between the chain C and the chain guide plate p1 is automatically avoided.

Conversely, when the lever 4 is rotated clockwise to transfer the chain C, which is engaged with the largest diameter sprocket a1 of the freewheel A, to the smallest diameter sprocket an, the chain running line is rotated in the Q direction in Figure 5. Displaced as if drawing a fan shape,
If chain guide plate p1. When p2 remains at the position shown by the chain line in FIG. 5, the chain C comes into contact with one end of the inner wall of the guide plate p2, producing an unpleasant contact sound.

However, according to the present invention, when the lever 4 is rotated in the above-mentioned direction, the pivot plate 13 interlocked with the lever 4 by the cam action is moved counterclockwise by the tensile force of the spring on the front transmission side. When the front transmission operating outer wire W1' is pivoted back and the compression on the front transmission operating outer wire W1' is released, the inner wire w2 is relatively loosened, so that the chain guide plate pI
tp2 moves slightly in the q direction and takes the position shown by the solid line in FIG.

Therefore, contact between the chain C and the chain guide plate p2 is automatically avoided.

In addition, although the case where the chain C meshes with the large-diameter sprocket b2 of the chain wheel B was explained as an example above, it can be argued that the same effect can be achieved even when the chain C meshes with the small-diameter sprocket b1. be.

Further, the configuration examples shown in FIGS. 1 and 2 can also be applied to a bicycle which is constructed by combining a so-called low normal type rear transmission and a low normal type front transmission, contrary to the above.

Figure 3 is applicable to a bicycle that combines a top normal type rear derailleur and a Roman type front derailleur, and a bicycle that combines a low normal type rear derailleur and a top normal type front derailleur. It is an explanatory view of the operation of an example configured as follows.

The configuration shown in FIG. 3, as shown in FIG. It is only necessary to set the shape of the drive side cam portion 11 so that the shape is opposite to the above.

According to the operation lever of the external bicycle transmission of the present invention, the conventional problem of contacting the chain with the front transmission side chain guide plate during rear transmission operation 1 can be automatically avoided. This prevents the occurrence of contact noise, reduces wear on the chain and chain guide plate, and extends the service life.

More importantly, conventionally, when operating the rear transmission control lever, the rider also delicately operated the front transmission control lever each time to avoid the chain contacting the chain guide plate as described above. This eliminates the operational inconvenience of having to use this system, and helps ensure safe driving, especially in urban areas with heavy traffic.

It goes without saying that the scope of the present invention is not limited to the examples shown in the drawings and described above.

That is, the gist of the present invention is that the rotational operation of the rear transmission control lever is controlled by a cam mechanism consisting of a drive side cam member provided at the base of the rear transmission control lever and a driven side cam member driven by the drive side cam member. The movement is transmitted to the end of the outer wire for controlling the machine, and simply by operating the rear transmission control lever,
The front transmission chain guide plate can be automatically moved laterally by a predetermined amount without operating the front transmission control lever, thereby avoiding contact between the chain and chain guide plate and generation of abnormal noise due to chain line wobbling. This is what I did.

Therefore, in the illustrated example, a lever for operating the rear transmission and a lever for operating the front transmission are arranged side by side on one side of the frame, and the movement of the pivoting plate-shaped driven side cam member is directly used to operate the front transmission. It is configured to transmit the pushing motion of the outer wire, but like a general double lever, there is a lever for operating the rear transmission on one side of the frame and a lever for operating the front transmission on the other side. In a lever of this type, the movement of the driven side cam member may be further transmitted to the movement of the outer wire of the front transmission operating lever attached to the opposite side of the frame via a link mechanism or the like.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of the present invention, Fig. 3 is an explanatory diagram of the operation of another configuration example of the present invention, and Fig. 4 is an illustration to which the present invention is applied. FIG. 5 is an explanatory diagram showing the bicycle chain running and the movement of the chain guide plate. DESCRIPTION OF SYMBOLS 1... Lever support body, 4... Rear transmission operating lever, 5... Front transmission operating lever, 11
... Drive side cam member, 12 ... Driven side cam member, 15 ... Trochanter, 19 ... Outer wire receiver.

Claims (1)

[Claims] 1. A driving side cam member is provided at the base end of the rear transmission operating lever, and a driven side cam member is provided which contacts and follows the driving side cam member, and the movement of this driven side cam with noise is controlled by the front transmission. By transmitting the signal to the end of the outer wire for operating the front transmission, the end of the outer wire for operating the front transmission is pushed or released from suppression in conjunction with the rotational operation of the rear transmission operating lever, and the front transmission is An operating lever for an external bicycle transmission, characterized in that the operating lever is configured such that relative movement occurs between an outer operating wire and an inner wire for operating the front transmission.