JPH0210077Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a bicycle gear shift operating device, more specifically, it is equipped with an operating lever, and transmits the movement caused by the rotation of the lever to the transmission mainly through an operating wire to shift the gear to a predetermined gear position. This invention relates to a speed change operation device.

Generally, this type of speed change operation device has a cylindrical lever shaft with a threaded hole provided on a base member fixed to the bicycle frame, and supports the boss part of the operation lever freely around the outside of the lever shaft. At the same time, a friction plate and a cylindrical cap that hides the friction plate are supported on the outer surface of the boss portion, and the friction is removed through the cap by tightening a screw body that is screwed into the screw hole of the lever shaft. A predetermined rotational resistance is applied to the lever by pressing the plate.

However, in this conventional speed change operation device, the friction plate and the cap are formed separately, and after the friction plate is supported on the boss portion during assembly, the cap is supported on the friction plate. Because of this, the friction plate and the cap must be managed separately, which not only complicates the management of the parts, but also causes misalignment between the friction plate and the cap during assembly. Assembly becomes difficult, and if a press-formed product is used as the friction plate, this friction has a directionality, so if you confuse the surface without burrs with the back surface with burrs and assemble it, the friction of the boss portion The contact surface with the plate is damaged by the burrs on the back side, and as a result, not only does it cause roughness when the operating lever is rotated, but it also becomes difficult to operate the operating lever.Furthermore, the friction plate is damaged when disassembled for inspection or repair. There was a high risk of losing it.

The present invention was devised in view of the above points, and the purpose is to prevent the friction plate from rotating together with the operating lever, and to simplify parts management by integrating the friction plate and the cap into a unit. At the same time, assembly workability can be improved, and even if a press-formed product is used as the friction plate, the friction plate can be assembled without damaging the boss portion of the operation lever, and the friction plate can be easily removed during disassembly. This reduces the risk of powder loss.

Therefore, the configuration of the present invention is such that a friction plate 6 is pressed against a boss portion 5a of an operating lever 5 rotatably supported on a lever shaft 3 via a cylindrical cap 7 to provide a predetermined rotational resistance to the lever 5. In the speed change operation device, a flat surface 3b is provided on the outer periphery of the shaft end of the lever shaft 3, and a flat surface 3b is provided on the inner peripheral surface of the friction plate 6 that is inserted into the lever shaft 3 and protrudes in the direction of the cap 7, An engaging protrusion 9 facing the flat surface 3b of the lever shaft 3 is provided, while the cap 7
Further, an engaging portion 10 is provided with which the engaging protrusion 9 engages and holds the friction plate 6 on the cap 7, and prevents the friction plate from rotating together with the operating lever. In addition, the friction plate and the cap can be managed as one unitized part, and there is no need to avoid misalignment between the friction plate and the cap during assembly, or if the friction plate is installed upside down. This also reduces the risk of losing the friction plate during disassembly.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the gear shift operating device of the present invention will be described below with reference to the drawings.

The illustrated speed change operating device includes a base member 4 having a lever shaft 3 attached to a band member 1 fixed to a bicycle frame, for example, a town tube, via a mounting bolt 2, and a boss portion 5a of an operating lever 5 attached to the lever shaft 3. This boss portion 5a
A friction plate 6 and a cylindrical cap 7 for concealing the friction plate 6 are supported on the outer surface of the lever shaft 3, and a headed screw body 8 having a knob that is inserted into the cap 7 is mounted in the center of the lever shaft 3. By screwing into the provided screw hole 3a, the friction plate 6 is pressed and a predetermined rotational resistance is applied to the lever 5. In addition, the boss portion 5a
An inner cavity 5 for receiving the friction plate 6 is provided on the outer surface of the
1 is provided.

Therefore, a flat surface 3b is provided on the outer periphery of the shaft end of the lever shaft 3, and a flat surface 3b is provided on the inner peripheral surface of the friction plate 6, which is inserted into the lever shaft 3, and protrudes in the direction of the cap 7. While an engaging protrusion 9 facing the flat surface 3b is provided, the cap 7 is provided with:
An engaging portion 10 is provided with which the engaging protrusion 9 engages and holds the friction plate 6 on the cap 7.

In the above configuration, the friction plate 6 has a plate thickness of
A metal plate of tool steel or the like with a thickness of about 0.6 m/m is press-formed into an annular shape, and during the forming, the engaging protrusion 9 is provided protrudingly on the inner circumferential surface thereof.

The cap 7 is formed into a cylindrical shape by molding a synthetic resin material, and the engaging portion 10 is provided on the inner circumferential surface of the cap 7 during the molding.

Further, although a plurality of the engaging protrusions 9 and the engaging parts 10 are provided facing each other (two engaging protrusions 9 and four engaging parts 10 in the drawing), it is also possible to provide one each of the engaging protrusions 9 and the engaging parts 10. However, the number and shape thereof are not particularly limited. In short, the engaging portion 1 of the engaging protrusion 9
It is sufficient that the friction plate 6 can be held on the cap 7 to the extent that it does not fall off due to the engagement with the cap 7.
As shown in the figure, the engaging protrusion 9 is provided with locking parts 9a, 9a protruding from its tip.
When engaged with the engaging portion 10, the locking portions 9a, 9a
It is preferable to engage the engaging portion 10 so that the engagement relationship is more difficult to be released. or,
When the friction plate 6 is supported in the inner cavity 51, the engagement protrusion 9 engages the lever shaft 3 as shown in FIG.
It is preferable to contact the flat surface 3b of the tip to prevent relative rotation of the friction plate 6 with respect to the lever shaft 3. Further, in the drawings, the inner peripheral surfaces of the friction plate 6 and the cap 7 are non-circular with an arcuate surface and a flat surface, and the engaging projections 9 and the engaging portions 10 are provided on the flat surface portions. .

As shown in FIG. 5, the illustrated cap 7 has a tapered surface 7a in contact with the friction plate 6, so that the friction plate 6 is bent into a conical shape, and the inner surface of the contact surface 7a is tapered. Non-contact surfaces 7c, 7c are provided on the flat surface 7b side portion of the peripheral surface, and a pressing portion 7d, between these non-contact surfaces 7c, 7c.
7d, the friction plate 6 is bent into a conical shape. By providing the non-contact surfaces 7c, 7c, it is possible to prevent the friction plate 6 provided with the engagement protrusions 9 from warping when the friction plate 6 is bent, and to allow the friction plate 6 to contact the boss portion 5a more uniformly. There are advantages.

Further, 20 in the figure is a spacer.

When assembling the speed change operating device configured as described above, the boss portion 5a of the operating lever 5 is inserted into the lever shaft 3 and supported for free rotation, and the cap 7 is inserted into the inner cavity 51 of the boss portion 5a. A screw body 8 is inserted into the cap 7 and screwed into the threaded hole 3a of the lever shaft 3, so that the friction plate 6 is inserted into the boss portion through the cap 7. 5a to apply a predetermined rotational resistance to the operating lever 5.

During this assembly, the friction plate 6 is attached to the cap 7 in advance.
Since the friction plate 6 and the cap 7 are held as a unit, there is no misalignment between the friction plate 6 and the cap 7.
Furthermore, the friction plate 6 formed by press molding is not assembled upside down.

Further, the friction plate 6 has an engaging protrusion 9 that is connected to the lever shaft 3.
Since it faces the flat surface 3b of the control lever 5 and is prevented from co-rotating with the control lever 5, even if the control lever 5 is repeatedly operated, the predetermined rotational resistance of the control lever 5 can be maintained satisfactorily for a long period of time. It can be maintained.

In the embodiment described above, the engagement projections 9 are provided on the friction plate 6 and the engagement portions 10 are provided on the cap 7, but they may be provided in the opposite manner.

Moreover, although the friction plate 6 is formed by press-molding a metal plate, it may be formed from a composite material mainly made of synthetic resin or asbestos fiber, and the material is not particularly limited.

Furthermore, although the description has been given of a speed change operation device in which the operating lever 5 is supported on the lever shaft 3 and the friction plate 6 is pressed by tightening the screw body 8, the present invention is similarly applicable to speed change operation devices having other structures. It can be done.

As described above, the present invention is designed to apply a predetermined rotational resistance to the lever 5 by pressing the friction plate 6 through the cylindrical cap 7 against the boss portion 5a of the operating lever 5 rotatably supported on the lever shaft 3. In the speed change operation device, a flat surface 3b is provided on the outer periphery of the shaft end of the lever shaft 3, and a flat surface 3b is provided on the inner peripheral surface of the friction plate 6 that is inserted into the lever shaft 3 and protrudes in the direction of the cap 7. While an engaging protrusion 9 facing the flat surface 3b of the lever shaft 3 is provided, the cap 7 is provided with:
Since the engaging portion 10 is provided which engages the engaging protrusion 9 and holds the friction plate 6 on the cap 7, it is possible to prevent the friction plate from rotating together with the operating lever. In addition, the friction plate and the cap can be managed as one unitized part, which reduces the complexity of parts management and simplifies the parts management. Since it is possible to eliminate misalignment between the parts, assembly work is easier and assembly work efficiency can be improved accordingly.Furthermore, even when press-formed friction plates are used, the friction plates do not turn over during assembly. Since it is possible to prevent the friction plate from being attached to the boss portion, it is possible to prevent the friction plate from galling the boss portion, and it is possible to maintain good rotatability of the operating lever. Furthermore, the risk of losing the friction plate during disassembly for inspection, repair, etc. can be reduced.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing one embodiment of the gear shift operating device of the present invention, Fig. 2 is a cross-sectional view taken along the line of Fig. 1, and Fig.
The figure is a cross-sectional view of the friction plate held in the cap.
4 is a sectional view taken along the line of FIG. 3, FIG. 5 is an exploded perspective view of the friction plate and the cap, and FIG. 6 is an explanatory diagram showing the positional relationship of the friction plate with respect to the cap. 5... Operating lever, 5a... Boss portion, 6... Friction plate, 7... Cap, 9... Engaging protrusion, 10...
...Engagement part.

Claims (1)

[Scope of utility model registration request] An operating lever 5 rotatably supported on a lever shaft 3
A friction plate 6 is attached to the boss portion 5a of the
In the speed change operation device which applies a predetermined rotational resistance to the lever 5 by pressing the lever 5, a flat surface 3b is provided on the outer periphery of the shaft end of the lever shaft 3, and
An engaging protrusion 9 is provided on the inner circumferential surface of the friction plate 6 that is inserted into the lever shaft 3 and that protrudes in the direction of the cap 7 and faces the flat surface 3b of the lever shaft 3. A bicycle gear shift operating device, characterized in that an engaging portion 10 is provided with which the engaging protrusion 9 engages and holds the friction plate 6 on the cap 7.