JPS632396Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a bicycle speed change operation device.

Generally, the bicycle transmission device rotatably supports the boss portion of the operating lever on a lever shaft having a non-circular surface, and the boss portion of the operating lever is fitted into the non-circular portion of the lever shaft including the non-circular surface. a screw body that supports a friction plate that provides resistance to rotation of the lever, and that is screwed onto the lever shaft via a pusher body that has a non-circular through hole that fits into the non-circular portion; The rotational resistance of the lever is adjusted by advancing and retracting the screw.

However, in the above-described structure, the through hole of the pushing body is formed to be slightly larger than the cross-sectional shape of the non-circular portion of the lever shaft in order to fit into the non-circular portion of the lever shaft, and the pushing body is When fitted onto the lever shaft, a gap is created between the through hole of the pushing body and the non-circular portion of the lever shaft, so by repeatedly operating the lever, the area within the gap is created. In this case, the pushing body rotates, and as the pushing body rotates, the screw body rotates, and there is a possibility that the screw body may eventually loosen.

The present invention was devised in view of these problems, and the purpose is to be able to finely adjust the rotational resistance given to the operating lever, while reliably preventing rotation of the friction plate relative to the lever shaft. It is an object of the present invention to provide a bicycle speed change operation device that can reliably prevent the screw body from loosening through a friction plate and a pusher body.

That is, the present invention rotatably supports the boss portion of the operating lever on a lever shaft having a non-circular surface, and
A non-circular portion including a non-circular surface of the lever shaft has a through hole that fits into the non-circular portion, supports an elastically deformable friction plate that provides resistance to rotation of the lever, and is fitted into the non-circular portion. The speed change operation device is configured to adjust the rotational resistance of the lever by screwing forward and backward a screw body screwed onto the lever shaft through a push body having a non-circular through hole that fits, the push body having a non-circular through hole. A pressing portion is provided that elastically deforms and presses the friction plate toward the boss portion of the lever due to the threading of the screw body, and a hole edge portion of the through hole of the friction plate that faces the non-circular surface of the lever shaft. is provided with an engagement protrusion that rises in the direction of the screw body and engages with the non-circular surface of the lever shaft when elastically deformed by the pressure of the pusher body, and the friction plate is characterized in that it is non-rotatably locked to the lever shaft.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The bicycle gear shift operating device according to the present invention will be described below based on embodiments shown in the drawings.

1 is a tightening band that is fixed to the top tube T of the bicycle, and on one side thereof there is a pair of mounting pieces 11, 1.
2, a tightening bolt 14 is supported on the mounting piece 11, and the tightening bolt 14 is screwed into a nut 15 fixed to the mounting piece 12, thereby reducing the diameter of the band 1 and tightening the top tube. It can be fixed to T.

Reference numeral 2 denotes a support body fixed to the band 1 via a fixing body with screwing means 20, and the support body 1 has an internal thread 21 for supporting an operating lever 3 to be described later.
A lever shaft 23 having a non-circular portion 22 having a non-circular surface 22a on its outer peripheral surface,
At a position laterally displaced from the center of the band 1,
It is provided so as to protrude almost perpendicularly to the axis of the band 1. Note that the non-circular portion 22 is provided with a flat surface on the outer peripheral surface of the tip end of the lever shaft 23,
A portion including this flat non-circular surface 22a is defined as a non-circular portion.

The operating lever 3 is composed of a boss portion 31 having a fitting hole 30 that is supported on the lever shaft 23 of the support body 2 configured as described above, and an operating portion (not shown), and is shown in FIG. If the lever 3 is
The boss portion 31 of each of these levers 3, 3
The fitting hole 30 is fitted onto the lever shaft 23 via the washer 5.

On the other hand, a circular or non-circular through hole 41 that fits into the non-circular portion 22 of the lever shaft 23 is provided in the center thereof.
By forming an elastically deformable friction plate 4 that provides resistance to the rotation of the lever 3, and fitting the through hole 41 into the non-circular portion 22 of the lever shaft 23, the friction plate 4 is supported on the non-circular portion 22 including the non-circular surface 22a of the lever shaft 23, and further has a non-circular through hole that fits into the non-circular portion 22, and is connected to the lever shaft 23 via a cap 6 serving as a pushing body. By screwing the screw body 7 into the screw body 7, the friction plate 4 is pressed against the boss portion 31 of the operating lever 3.
1 and the friction plate 4, and the rotational resistance of the lever 3 is adjusted by screwing the screw body 7 back and forth.

A wire groove 33 is formed on the outer periphery of the boss portion 31 of the operating levers 3, 3, and an operating wire (not shown) whose one end is connected to a transmission (not shown) is inserted along the wire groove 33. At the same time, the other end of the wire is connected to one side of the boss portion 31 of the lever 3, so that when the operating lever 3 is operated, the wire is pulled to operate the transmission.

The present invention provides a bicycle gear shift operating device constructed as described above, in which the friction plate 4 is connected to the operating lever 3 by the threaded body 7 screwing into the cap 6.
A pressing portion 61 that is elastically deformed and pressed is provided on the boss portion 31 side of the friction plate 4, and the through hole 41 of the friction plate 4 is
At the hole edge opposite to the non-circular surface 22a of the lever shaft 23, rising in the direction of the screw body 7,
And when the cap 6 is elastically deformed by pressing,
The non-circular surface 22a of the lever shaft 23 is elastically deformed.
A plate-like engagement protrusion 42 is provided to engage with the lever shaft 23, and when the screw body 7 is in the screwed-in position, the friction plate 4 is non-rotatably locked on the lever shaft 23.

Specifically, the inner circumferential surface 32 of the boss portion 31 of the operating lever 3 is inclined radially inward, and the cap 6 has an engagement mechanism in which the lower surface of the head of the screw body 7 engages with the upper surface thereof. A recess 60 is provided,
Further, a pressing portion 61 is provided on the lower surface of the friction plate 4 to press the friction plate 4 toward the boss portion 31 of the operating lever 3 by the screw body 7 screwing forward.

The present invention is constructed as described above, and first, the lever shaft 23 is fitted into the fitting hole 30 of the operating lever 3, and the friction plate 4 is fitted into the engagement protrusion 42 provided on the friction plate 4. It is inserted into the lever shaft 23 so as to correspond to the non-circular surface 22a of the lever shaft 23.

Next, the cap 6 is inserted into the lever shaft 23 and brought into contact with the friction plate 4,
Furthermore, the screw body 7 is screwed onto the internal thread 21 of the lever shaft 23 as shown in FIG.

Then, from the state shown in FIG.
is tightened to the internal thread 21 of the lever shaft 23, and as the threaded body 7 is threaded, the pressing part 61 of the cap 6 pushes the friction plate 4 against the boss part 31 of the operating lever 3 as shown in FIG. It deforms elastically to the side and presses it.

On the other hand, at the hole edge of the through-hole of the friction plate 4 facing the non-circular surface 22a of the lever shaft 23, there is a rise in the direction of the screw body 7, and when the cap 6 is elastically deformed by the pressure of the cap 6, Since the engaging protrusion 42 that engages with the non-circular surface 22a of the lever shaft 23 is provided, the pressing portion 61 of the cap 6 presses the friction plate 4 toward the boss portion 31 of the operating lever 3 as described above. As a result, the engaging protrusion 42 of the friction plate 4 is displaced radially inward, and as shown in FIG. The engagement protrusion 42 engages with the non-circular surface 22a of the shaft 23 in a linear contact manner, and the engagement protrusion 42 is elastically deformed.
The elastic restoring force causes the non-circular surface 2 of the lever shaft 23 to
2a, there is no risk that the friction plate 4 will wobble with respect to the lever shaft 23. In other words, the friction plate 4 can be locked to the lever shaft 23 in a non-rotatable manner. be.

Therefore, since the friction plate 4 is locked to the lever shaft 23, there is no risk that the screw body 7 will loosen through the cap 6 even if the operating lever 3 is repeatedly operated. This allows for reliable lever operation.

In addition, although two operation levers 3 are used in what is shown in the drawings, one operation lever 3 may be used.

As described above, the present invention rotatably supports the boss portion of the operating lever on the lever shaft having a non-circular surface, and also fits into the non-circular portion of the lever shaft including the non-circular surface. It supports an elastically deformable friction plate that has a through hole and provides resistance to the rotation of the lever, and is screwed onto the lever shaft via a pusher body that has a non-circular through hole that fits into the non-circular portion. A speed change operating device that adjusts the rotational resistance of the lever by screwing a screw body forward and backward, the friction plate being attached to the pushing body by screwing the screw body;
A pressing part that is elastically deformed and pressed is provided on the boss side of the lever, and a pressing part that rises in the direction of the threaded body is provided on the hole edge opposite to the non-circular surface of the lever shaft in the through hole of the friction plate, and , an engaging protrusion is provided that engages with the non-circular surface of the lever shaft when the pushing body is elastically deformed by the pressing force, and the friction plate is non-rotatably locked on the lever shaft at the screwed position of the screw body. By doing this, the friction plate can be elastically deformed to provide resistance to the rotation of the lever, so the rotational resistance of the lever can be finely adjusted. When applying the force, the engagement protrusion of the friction plate can be displaced radially inward and the tip of the engagement protrusion can be elastically pressed and engaged with the non-circular surface of the lever shaft. While the friction plate can be set to a suitable rotational resistance, rotation of the friction plate relative to the lever shaft can be reliably prevented, and therefore, the possibility that the screw body may loosen even if the operating lever is repeatedly operated can be reliably eliminated.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional plan view of the main part showing an embodiment of the device of the present invention, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a partially omitted cross-section showing the screwing position of the screw body. FIG. 4 shows a sectional view taken along the - line in FIG. 3. DESCRIPTION OF SYMBOLS 1... Band, 2... Support body, 3... Operating lever, 4... Friction plate, 41... Engaging protrusion, 6... Cap, 61... Pressing part, 7... Screw body.

Claims (1)

[Scope of utility model registration request] A boss portion of the operating lever is rotatably supported on a lever shaft having a non-circular surface, and a non-circular portion including the non-circular surface of the lever shaft has a through hole that fits into the non-circular portion; The screw body supports an elastically deformable friction plate that provides resistance to the rotation of the lever shaft, and is screwed back and forth on the lever shaft through a pusher body having a non-circular through hole that fits into the non-circular portion. The speed change operating device is configured to adjust the rotational resistance of a lever, and the pushing body is provided with a pushing part that elastically deforms and presses the friction plate toward the boss part of the lever by screwing the threaded body. At the same time, at the hole edge opposite to the non-circular surface of the lever shaft in the through-hole of the friction plate, a non-circular surface of the lever shaft rises in the direction of the screw body, and when elastically deformed by the pressure of the pusher body, the non-circular surface of the lever shaft 1. A bicycle speed change operating device, characterized in that an engaging protrusion that engages with a surface is provided, and the friction plate is unrotatably locked on the lever shaft when the screw body is in a spirally advanced position.