JPS6052032B2 - Bicycle speed control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bicycle speed change operating device, and more particularly to a speed change operating device for operating a bicycle transmission via an operating wire by operating a control lever.

In general, such a speed change operating device supports an operating lever on a fixed member fixed to the top tube or handlebar of a bicycle frame via a lever shaft so as to be able to reciprocate within a certain range. The transmission is configured to be operated by applying rotational resistance and rotating the operating lever in a reciprocating direction overcoming the rotational resistance.

Therefore, when the gear ratio is decreased to rotate the wheels at a low speed, the operating lever is rotated in the forward direction, and when the gear ratio is increased and the wheels are rotated at a high speed, the operating lever is rotated. For example, when the bicycle is applied to a motocross bicycle where gear shifting operations are frequently performed, the operation is complicated and speedy gear shifting operations are not possible.

The present invention was devised in view of the above-mentioned problems, and the present invention performs a two-speed shift to low speed and high speed by only rotating the operating lever in one direction without rotating the control lever in the reciprocating direction. A lever shaft 2 is provided in a protruding manner on the fixed member 1, and a protruding portion 41 having a first engaging portion 41a and a second engaging portion 41b is provided on the lever shaft 2. The lever shaft 2 is provided with an engaging protrusion 51 and a second engaging portion of the lever 4. 41b
A wire support body 5 having a wire fixing member 5a and a hitch 52 that engages with the wire support body 5 is rotatably supported, and the movement of the lever 4 in the forward direction is linked to the wire support body 5 through the protrusion part 41. At the same time, the lever 4 is attached to the fixing member 1.
At the forward movement position, the engaging protrusion 51 of the wire support 5
A locking body 6 having a locking portion 6b that locks with the wire support body 5 and prevents movement of the wire support body 5 in the backward movement direction is attached to the locking protrusion 5.
1 and a spring that biases the locking body 6 to the locking position with respect to the engagement protrusion 51 and the lever 4 is constantly restored. A spring is provided which urges the lever 4 to move to the moving position and returns to the backward moving position when the lever 4 is released after being operated to the forward moving position. When the lever 4 is operated from the backward movement position to the forward movement position in the locked state, a release body 8 that interferes with the locking body 6 and releases the locking of the wire support body 5 is pivotally mounted. It is characterized by the fact that

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a bottomed cylindrical fixing member that is fixed to the handlebar of the bicycle via a tightening band (shown in the figure), and as shown in Fig. 3, the bottom wall has a mounting hole 1a for attaching the lever shaft. Mounting holes 11:) for mounting the body are bored at regular intervals, and cutouts 1c for guiding the operating lever and guide grooves 1d for the operating wire W are provided at regular intervals on the side wall. It is being

Further, a contact 1e is provided on the bottom wall near the mounting hole 1b and projects toward the open upper surface. Reference numeral 2 denotes a cylindrical lever shaft fixed to the fixing member 1 via a mounting screw 3 screwed into the mounting hole 1a, and a first support part 2b and a second support part are provided on the outer periphery of the shaft around the annular protrusion 2a. 2c is provided, and the operating lever 4 and the wire support body 5 are rotatably supported on the first support portion 2b.

Note that the lever shaft 2 may be fixed to the fixing member 1 via a pin, or may be formed integrally with the fixing member 1.
The operating lever 4 is composed of a pivot portion 4a having a through hole that fits into the lever shaft 2, and an operating portion 4b extending from the pivot portion 4a. The operating lever 4 is fitted into and supported by the first support portion 2b of the shaft 2 so as to be rotatable, and the operating portion 4b of the operating lever 4 is made to protrude outward from the cutout portion 1c of the fixed member 1, so that it can be moved forwardly relative to the fixed member 1. The pivot portion 4a is made to be reciprocally rotatable between the position and the backward movement position, and one side of the pivot portion 4a is made to protrude in a direction different from the direction of the operating portion 4b, and this protrusion portion 41 has a second portion that engages with the abutment 1e. A first engaging portion 41a and a second engaging portion 41b that engages with the side portion of the wire support 5 are provided.

On the other hand, the wire support body 5 is made of a disk-shaped flat plate, and has a wire fixture 5a on one side thereof having a locking hole for receiving and supporting the enlarged portion 20 provided at one end of the operation wire W. is provided.

Therefore, an engaging protrusion 51 having a locking surface 51a is provided on the side of the lever wire support 5 at a constant distance from the wire fixture 5a, and the operating lever 4 is provided near the wire fixture 5a. The hit 5 that engages with the second engaging portion 41b of
2 is provided in a protruding manner, and the engagement of this contact 52 with the second engaging portion 41b causes the movement of the operating lever 4 in the forward direction to be linked to the wire support 5. The top surface of the engagement protrusion 51 is shaped like an arc, and the top surface is
By forming a tapered surface that slopes toward the locking surface 51a as shown in the drawings, the locking body, which will be described later, can be quickly disengaged from the locking surface. Further, reference numeral 6 denotes a locking body that locks the movement of the wire support body 5 in the backward movement direction when the lever 4 is in the forward movement position, and includes a pivot portion 6a having a through hole.
, a hook-shaped locking portion 6b extending outward from the pivot portion 6b, and a lock release portion 6c extending further outward from the middle of the locking portion 6b. The through-hole portion is pivoted to the fixing member 1 by removing a mounting screw 7 inserted into the mounting hole 1b of the fixing member 1, and the locking body 6 is movable around the mounting screw 7, The wire support 5 is locked by the engagement of the locking portion 6b with the locking surface 51a.

Further, a spring locking protrusion 61 is provided on the edge of the locking body 6 on the side of the pivot portion 6a. Reference numeral 8 denotes a release body for releasing the wire support 5 from the locking body 6, which is made of a flat plate, and one end of the release body 8 is connected to the pivot portion 4a of the operating lever 4 via a pin 9. When the locking portion 6b is engaged with the locking surface 51a and the operating lever 4 is rotated from the forward movement starting position (backward movement position) in the forward movement direction, the release body is supported in a freely rotatable manner. 8 is engaged with the unlocking portion 6c, the locking body 6 is moved in the forward movement direction of the operating lever 4, and the wire support body 5 is unlocked.

A stop 8a for regulating the rotation of the release body 8 within a certain range is provided at the pivot side edge of the release body 8, and a locking hole 8b for locking a spring is provided at the tip. .

Reference numeral 10 always biases the operating lever 4 in the backward movement direction, and upon release of the lever 4 after operating it to the forward movement position, returns it to the forward movement starting position, and also causes the locking body 6 to move in the forward movement direction. The middle portion is wound with a spring that biases the engagement protrusion 51 to the locking position, and this wound portion is supported by the second support portion 2c of the lever shaft, and the wound portion is reduced in diameter. In this state, one end of the lever is locked in the protrusion 61 of the locking body 6, and the other end is locked in the locking hole 8b of the release body 8, so that the operating lever 4 is constantly restored by the elastic restoring action of the spring 10. At the same time, it urges the locking body 6 to the locking position to the engagement protrusion 51 around the mounting screw 7.

In addition, 30 in the figure is a nut screwed onto the mounting screw 7, and 31
0 is a washer, and 0 is an outer tube for guiding the operating wire W.

Next, the operation of the shift operating device configured as above will be explained.

In the state shown in FIG. 1, the chain guide of the transmission is in the high speed position and the gear ratio is increased, and the operating lever 4 is biased in the backward movement direction, and the lever 4 is engaged in the first engagement. Part 4
1a contacts the abutment 1e of the fixed member 1 and is stopped at the forward movement starting position, and the wire support 5 is always urged in the backward movement direction of the lever 4 by the return spring of the transmission. Then, the abutment 52 of the support body 5 engages with the second engaging portion 41b of the lever 4, and prevents the wire support body 5 from moving in the backward direction (clockwise direction). 6
In this case, the tip of the locking portion 6b engages with the top surface of the engagement protrusion 51 of the support 5, and the wire support 5 moves in the forward direction (counterclockwise).
It allows for movement to.

However, in the levered state, when shifting the chain guide of the transmission to a low speed position to reduce the gear ratio, the lever 4 is moved in the forward direction against the spring 10 and the return spring of the transmission. (counterclockwise), and at this time, the wire support 5 moves forward in conjunction with the forward movement of the operating lever 4, and as the support 5 moves forward, the locking portion 6b tip and engagement protrusion 51
The engagement position with the top surface is displaced, and at the same time the forward rotation of the lever 4 reaches a certain stroke, the engagement is released, and the locking portion 6b engages the engagement protrusion 5 as shown in FIG.
1, the movement of the wire support 5 in the backward movement direction is stopped, and the speed change state can be maintained reliably.

At this time, the operating lever 4 rotates in the backward movement direction due to the elastic restoring action of the spring 10, and the first engaging portion 41a
By engaging with the abutment 1e, the lever 4 is stopped at the forward movement starting position as shown in FIG. Further, when the lever 4 moves back, the release body 8 engages the lock release part 6 of the lock body 6.
However, since the release body 8 rotates relative to the operating lever 4, it does not interfere with the backward movement of the lever 4. Next, in the state shown in Fig. 5, if you want to move the chain guide of the transmission to a high speed position and increase the gear ratio, rotate the operating lever 4 at the forward movement start position in the forward movement direction against the spring 10. At this time, the tip of the release body 8 pivotally supported on the operating lever 4 engages with the lock release part 6c, and the movement of the lever 4 is transmitted via the release body 8 to the lock release part 6c.
c, the locking body 6 moves counterclockwise with the forward movement of the operating lever 4, and the locking portion 6b is disengaged from the locking surface 51a, that is, the wire support 5 is unlatched. The stop is released, and as a result of this release, the wire support 5 is rotated in the backward direction by the return spring of the transmission, resulting in the state shown in FIG. At this time, the operating lever 4
Due to the elastic restoring action of 0, it rotates in the backward movement direction and stops at the forward movement starting position. Further, the engagement with the locking surface 51a is released and the locking surface 51a is released.
The distal end of the locking portion 6b engages with the top surface of the engagement protrusion 51, allowing the wire support 5 to move in the forward direction. As described above, the present invention provides a lever shaft 2 protruding from a fixed member 1, and a first engaging portion 410a and a second engaging portion 410a on this lever shaft 2.
An operating lever 4 having a protrusion 41 having an engaging portion 41b is supported so as to be rotatable back and forth between forward and backward positions, and one engaging protrusion 5 is provided on the lever shaft 2.
1, a wire support 5 having a contact 52 that engages with the second engaging portion 41b of the lever 4, and a wire fixture 5a are rotatably supported to prevent the forward movement of the lever 4. While interlocking with the wire support 5 via the protrusion 41, the lever 4 is engaged with the engagement protrusion 51 of the wire support 5 at the forward movement position of the lever 4, and the wire support A locking body 6 having a locking portion 6b that prevents movement of the locking member 5 in the backward movement direction is swingably supported between a locking position to the engagement protrusion 51 and a disengaging position,
A spring that biases the locking body 6 to the locking position to the engagement protrusion 51 and a spring that always biases the lever 4 to the backward movement position and release the lever 4 after operation to the forward movement position. A spring 10 is provided to return the lever 4 to the forward position from the backward position with the locking body 6 locking the wire support 5 to the lever 4. Since a release body 8 that interferes with the lock body 6 and releases the lock of the wire support body 5 during operation is pivoted, the operation lever 4 can be changed to either high speed or low speed. This can be done easily and reliably by simply rotating in the forward movement direction with a constant stroke from the backward movement position to the forward movement position, and the complexity of operating the operating lever 4 can be reduced. This allows for improved operability.

Therefore, when applied to a motocross bicycle that requires frequent gear shifting operations, the operating lever 4 is very easy to use, and both high and low speed shifts can be performed quickly and reliably. It is possible to put it into practical use.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view with the lid removed, Fig. 2 is a cross-sectional plan view, Fig. 3 is an exploded perspective view, and Figs. FIG. 3 is a plan view showing the operating state. 1... Fixed member, 2... Rubber shaft, 4...
...Operation lever, 41...Protrusion, 41a
...First engaging part, 41b... Second engaging part, 5... Wire support, 5a... Wire fixture, 51... ...Engagement protrusion, 52...
- Hit, 6...Latching body, 6b...Latching part, 8...Release body, 10...Spring, W
...Operation wire.

Claims (1)

[Claims] 1. A lever shaft 2 is provided protrudingly on the fixed member 1, and the operating lever 4, which has a protruding portion 41 having a first engaging portion 41a and a second engaging portion 41b, is moved forward. The lever shaft 2 is supported so as to be reciprocally rotatable between the lever shaft 2 and the return position, and has an engaging protrusion 51, a contact 52 that engages with the second engaging portion 41b of the lever 4, and a wire. rotatably supporting the wire support 5 having the fixture 5a,
The forward movement of the lever 4 is linked to the wire support 5 via the protrusion 41, while the fixing member 1 is provided with an engaging protrusion of the wire support 5 at the forward movement position of the lever 4. 51 and has a locking portion 6b that prevents the wire support 5 from moving in the backward direction.
a spring that swingably supports the locking body 6 between a locking position to the engagement protrusion 51 and a disengaging position, and biases the locking body 6 to the locking position to the engagement protrusion 51. and a spring that always biases the lever 4 to the backward movement position and returns it to the backward movement position when the lever 4 is released after operation to the forward movement position, and the lever 4 is provided with a spring that urges the lever 4 to the backward movement position, and the lever 4 is provided with a spring that urges the lever 4 to the backward movement position and returns to the backward movement position when the lever 4 is released from the forward movement position after being operated to the forward movement position. 6 locks the wire support 5, when the lever 4 is operated from the backward movement position to the forward movement position, the lever 4 interferes with the locking body 6 and releases the lock of the wire support 5. A bicycle gear shift operating device, characterized in that a release body 8 is pivotally mounted.