JPS6238877Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a gear shift operating device mainly used for bicycles. Specifically, an operating lever is rotatably supported on a fixed member having a lever shaft, and the movement caused by the rotation of the lever is transmitted to the transmission. The present invention relates to a gear shift operating device that switches to a predetermined gear position.

Conventionally, as a gear shift operation device used for bicycles,
A plurality of engaging parts are provided on one side of the operating lever and a fixed member that supports the lever, and a locking body such as a ball that engages with one of the engaging parts is supported on the other side,
The locking body is biased toward the engaging portion by a spring, and the gear position is determined by the engagement of the locking body with the engaging portion, and at the same time, the lever is stopped at a position corresponding to the gear position. It is known that it is made to do so.

However, the conventional speed change operating device configured as described above is provided with a positioning mechanism consisting of the locking body and the engaging portion on the side of the boss portion of the operating lever.
A part of this positioning mechanism, especially the holding case of the spring that biases the locking body, protrudes greatly to the outside, causing the problem of increasing the overall size. There was a high risk that their limbs would come into contact with them and be injured, or that their clothes could get caught and tear.

The present invention was devised in view of the above points, and the purpose is to provide a hollow part in the boss part of the operating lever, provide an engaging part and a locking body of the positioning mechanism in this hollow part, and also provide the engaging part and locking body of the positioning mechanism in the hollow part. The present invention is characterized in that a holding hole for holding the elastic member of the positioning mechanism is provided to prevent the positioning mechanism from protruding to the outside.

Therefore, the present invention provides a hollow portion in the boss portion of the lever, and provides two sets of a plurality of engaging portions facing each other on the inner peripheral surface of the hollow portion, and engages one of the engaging portions of each set. Two sets of locking bodies that fit together are arranged in the cavity, and the lever shaft located in the cavity is provided with a holding hole that penetrates in the radial direction of the lever shaft. By passing through one coil spring that biases each set of locking bodies toward the engaging portion of each set, the positioning mechanism is prevented from protruding to the outside.

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

In the figure, 1 is a lever shaft fixed to, for example, a top tube of a bicycle frame, and 2 is an operating lever rotatably supported on this lever shaft 1. The lever shaft 1 may be fixed by a fixing means such as a set screw or welding, but it is preferable to form it integrally with a mounting body 3 as shown in the drawings and to fix it to the frame via this mounting body 3. The mounting body 3 is formed, for example, in the shape of a box with a hollow interior and an open bottom, and a mounting hole 31 is provided in the center of the upper wall thereof, and the lever shaft 1 is provided on the side surface.
protrudes in a direction perpendicular to the axis of the mounting hole 31. It is fixed to the frame by a fixing means consisting of a mounting screw 32 inserted into the mounting hole 31 and a threaded tube 33 directly attached to the bicycle frame by welding.

Further, the operating lever 2 has a boss portion 2a at one end and an operating portion 2b at the other end, and a shaft hole 2 for receiving the lever shaft 1 is provided at the center of the boss portion 2a.
1 is provided, and the shaft hole 21 portion is fitted into the lever shaft 1 to support the lever shaft 1 in a freely rotatable manner,
A disc-shaped upper lid 5 having a through hole is disposed on the outer end surface of the boss portion 2a via a washer 4, and the upper lid 5 is
By screwing a tightening screw 6, which is non-rotatably supported on the lever shaft 1 and is inserted into the upper cover 5, into a screw hole 11 provided at the center of the lever shaft 1, a predetermined rotational resistance is applied to the lever 2. It gives.

The shaft hole 21 is provided with a recessed hole in the boss portion 2a of the operating lever 2, which is rotatably supported as described above, which opens on the surface facing the side surface of the mounting body 3 and has a diameter larger than that of the shaft hole 21. A plurality of engaging portions 71 are provided on the inner peripheral surface of the hollow portion 22 on the same axis as the gear position, and one of the engaging portions 71 is provided on the same axis as the gear position. A locking body 72 that engages with is disposed within the cavity 22, and a holding hole 12 extending in the radial direction of the lever shaft 1 is provided in the lever shaft 1 located within the cavity 22, A coil spring 73 that biases the locking body 72 toward the engaging portion 71 is held in the holding hole 12, and the gear position is determined by the engagement of the locking body 72 with the engaging portion 71. , the lever 2 is configured to stop at a position corresponding to the gear position. The hollow portion 22 may be formed by providing a protruding cylindrical body instead of forming a recessed hole in the boss portion 2a.

As shown in the figure, two sets of the positioning mechanism consisting of the engaging portion 71, the locking body 72, and the coil spring 73 are provided. Moreover, the locking body 72 is
Although rolling elements such as rolls and balls are used, they may be formed in shapes other than rolling bodies.

Further, the holding hole 12 provided in the lever shaft 1 is a through hole penetrating in the radial direction as shown in the figure in order to provide two sets of the positioning mechanisms.

Note that the illustrated lever shaft 1 has a cylindrical body 1 having a through hole 13a penetrating in the radial direction of the lever shaft 1.
3 is unrotatably supported, a part of the locking body 72 and both ends of the coil spring 73 are inserted into the through hole 13a, and the coil spring 73 is inserted into the through hole 13a.
However, instead of providing the cylindrical body 13, for example, the lever shaft 1 may be provided with a large diameter shaft portion and a small diameter shaft portion. The holding hole 12 may be provided in the large diameter shaft portion, and the lever 2 may be supported in the small diameter shaft portion.

The boss portion 2a of the operating lever 2 has a winding groove 23 for winding the operating wire, and a locking hole 2 for receiving and locking a hook fixed to one end of the wire.
4.

The present invention is constructed as described above, and as is known, the operating lever 2 is connected to a movable member of a transmission (not shown) by an operating wire, and the movable member is moved by rotating the lever 2. Then, the gear is shifted to a predetermined gear position.

Due to the rotation of the lever 2, the locking body 72, which has been engaged with one of the engaging parts 71, resists the force of the coil spring 73 and moves
At the same time, the locking body 72 overcomes the peak between the engaging part 71 and the next engaging part adjacent to the engaging part 71, and at the same time the locking body 72 moves to the next position by the force of the coil spring 73. The operating position of the operating lever 2 is maintained by this engagement. Further, when the locking body 72 engages with the engaging portion 71 due to the force of the coil spring 73,
Engagement noise occurs. This engagement sound is emitted from the engagement portion between the locking body 72 and the engagement portion 71 into the cavity 22, causes a resonance effect in the cavity 22, and becomes an amplified loud sound that is transmitted to the outside. The sound is emitted.

As described above, the present invention provides a hollow portion in the boss portion of the operating lever, and has two or more engaging portions on the inner peripheral surface of the hollow portion.
two sets of locking bodies that are arranged opposite to each other and that engage with one of the engaging parts of each set are disposed in the hollow part, and on the lever shaft located in the hollow part, A holding hole is provided that passes through the lever shaft in the radial direction, and one coil spring that biases each set of locking bodies toward the engaging portion of each set is passed through the holding hole. By biasing two sets of locking bodies against a plurality of engaging parts provided on the inner circumferential surface of the cavity with one coil spring penetrating through the boss part, the positioning mechanism can be moved to the outside of the boss part. It can be compactly installed in the hollow space of the boss part of the operating lever without protruding into the
In addition, it is possible to completely eliminate injury to the driver's limbs and tearing of clothes caused by the protrusion of the positioning mechanism from the boss portion to the outside. Since the positioning mechanism is held, a general coil spring having a length close to the diameter of the hollow portion can be used as the spring constituting the positioning mechanism, and a coil spring with a large number of turns can be used. It allows the use of highly durable and low-cost coil springs.
Furthermore, ease of assembly can be achieved.

Furthermore, if two coil springs are used to bias the locking bodies individually against the engaging part, variations may occur in the spring coefficients of the individual coil springs, but one coil spring can penetrate the lever shaft and bias the locking bodies against the engagement part at the same time. Because it urges two locking bodies,
It is possible to eliminate the problems that arise due to variations in the spring coefficient, such as heavy lever operation and problems in maintaining the set position, which in turn can eliminate variations in quality and improve yields.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the device of the present invention, and FIG. 2 is a sectional view taken along the line of FIG. 1. DESCRIPTION OF SYMBOLS 1... Lever shaft, 12... Holding hole, 2... Operating lever, 2a... Boss part, 71... Engaging part, 72
... Locking body, 73 ... Coil spring.

Claims (1)

[Scope of utility model registration request] A speed change operation device in which an operating lever is rotatably supported on a lever shaft, and one end of an operating wire is supported on the lever, a hollow portion is provided in a boss portion of the lever, and a plurality of holes are provided on the inner peripheral surface of the hollow portion. Two sets of engaging portions are provided in a facing manner, and two sets of locking bodies that engage with one of the engaging portions of each set are disposed within the hollow portion and located within the hollow portion. The lever shaft is provided with a holding hole that penetrates in the radial direction of the lever shaft, and one coil spring that biases each set of locking bodies toward the engaging portion of each set is passed through the holding hole. A speed change operation device characterized by: