JPS6227514Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a gear shift operating device mainly used for bicycles, and more specifically, an operating lever is rotatably supported on the lever shaft of a base having a lever shaft, and movement due to rotation of the lever is controlled. The present invention relates to a speed change operation device that transmits information to a transmission via an operation wire and switches to a predetermined speed.

In general, a bicycle speed control device has a lever shaft with a threaded hole in the center protruding from a base with a supporting surface, and the lever shaft has a winding part for the operating wire at the boss part. The boss part of the operating lever is supported to rotate freely, and a disc-shaped top cover with a through hole is arranged on the outside of the boss part via a washer, and a tightening screw inserted into the top cover is connected to the lever shaft. The screw engagement provides a predetermined rotational resistance to the operating lever.

However, in this conventional model, the boss part of the operating lever is exposed to the outside without being hidden, so rainwater and dust can enter the interior through the gap between this boss part and the base and top cover. Not only did the internal parts easily rust, but the operating lever also had the disadvantage of poor operability.

By the way, in order to prevent rainwater etc. from entering the interior, it is possible to cover the boss part of the operating lever with a bowl-shaped cover. Since it is necessary to provide a notch hole to allow for this, a large opening is created between this notch hole and the operating lever, and as a result, rainwater and dust can enter the cover through the opening created by the notch hole, and furthermore, this There is a problem that the inside of the cover may be invaded from between the boss portion of the operating lever and the base and the top cover.

The present invention has been devised in view of the above points, and its purpose is to provide a speed change operation device that has a simple structure and can prevent rainwater and dust from entering the inside.

Therefore, the present invention provides a base 1 having a support surface 11.
A lever shaft 2 is provided protrudingly on the lever shaft 2, and the boss portion 3a of the operating lever 3, which has an inner surface and an outer surface facing the support surface 11, is rotatably supported on the lever shaft 2. 3a, a winding portion 31 of the operating wire; a first annular sealing surface 32a located on the inner surface of the boss portion 3a and facing the support surface 11; and an outer surface of the boss portion 3a.
Further, a seal portion 32 having an annular second seal surface 32b located radially outward on the inner side of the winding portion 31 is provided, and an end surface 6a facing the second seal surface 32b is provided. A cover body 6 is formed, and the end surface 6a of this cover body 6 is
is attached to the base 1 so as to face the second sealing surface 32b.

Embodiments of the gear shift operating device of the present invention will be described below with reference to the drawings.

The illustrated gear shift operating device has a support surface 11,
A cylindrical lever shaft 2 with a screw hole 2a in the center is protruded from a base 1 fixed to, for example, a top tube of a bicycle frame, and the lever shaft 2 has an inner surface and an outer surface facing the support surface 11. The boss portion 3a of the operating lever 3 is rotatably supported via a sleeve 4, and washers 20, 2 are provided on the outside of the sleeve 4.
1 and 22, and by screwing the tightening screw 23 inserted into the upper cover 5 into the threaded hole 2a of the lever shaft 2,
A predetermined rotational resistance is imparted to the sleeve 4 and thus to the lever 3.

The base 1 is formed of a semicircular curved member, and the flat support surface 11 described above is provided at the top of the curve, and the lever shaft 2 is protruded from the center of the support surface 11. A winding portion 31 of the operating wire W is disposed on the outer circumferential surface of the boss portion 3a of the operating lever 3 supported by the operating lever 2, and an annular first sealing surface 32a located on the inner surface side of the boss portion 3a and facing the support surface 11. and on the outer surface side of the boss portion 3a,
Further, a seal portion 32 having an annular second seal surface 32b located radially outward on the inner side of the winding portion 31 is provided, and an end surface 6a facing the second seal surface 32b is provided. A bowl-shaped cover body 6 is formed, and the end surface 6a of the cover body 6 is opposed to the second sealing surface 32b,
It is attached to the base 1, and the boss portion 3a of the lever 3 is covered with the cover body 6.

In the above configuration, the winding part 31 provided on the operating lever 3 is provided in the middle of the boss part 3a in the axial direction, and is a locking part that locks one end of the operating wire W as shown in FIGS. 4 and 7. 31a, and a winding groove 31b extending from the locking portion 31a along the outer peripheral surface of the boss portion, and the locking portion 31b is formed at the base of the operating portion 3b extending outward from one side of the outer peripheral surface of the boss portion 3a. The seal portion 32 is provided in an annular shape at a position continuous with the winding portion 31. Although it is preferable that the first sealing surface 32a of the sealing portion 32 be formed as a continuous surface over the entire circumference as shown in the figure, for example, by forming the locking portion 31a, the first sealing surface 32a may be formed as a continuous surface over the entire circumference. If it cannot be formed on the surface,
The upper surface a of the locking piece constituting the locking portion 31a is flush with the upper surface of the second sealing surface 32b.

Further, the cover body 6 is formed into a bowl shape, and a non-circular through hole 31 is provided at the top thereof to receive the tip of the lever shaft 3, and the lever shaft 2 is inserted into the through hole 31 portion. By doing so, rotation with respect to the lever shaft is prevented, and by tightening the tightening screw 23, the open end surface 6a is brought into contact with the second seal surface 32b of the seal portion 32, and the lever shaft 2 is attached to the lever shaft 2.

The illustrated speed change operating device includes a gap between the support surface 11 of the base 1 and the first seal surface 32a, and a gap between the open end surface 6a of the cover body 6 and the second seal surface 32b.
Ring-shaped seal members 7 and 8 are interposed between the two, but these seal members 7 and 8 are not necessarily required. However, by providing the seal members 7 and 8 as shown, the first part of the seal part 32
There is an advantage that rainwater can be more effectively prevented from entering the interior from between the sealing surface 32a and the support surface 11 and between the second sealing surface 32b and the open end surface 6a of the cover body 6. Moreover, instead of the seal members 7 and 8, a labyrinth formed of annular uneven stripes is provided between the first seal surface 32a and the support surface 11 and between the second seal surface 32b and the open end surface 6a of the cover body. A seal may also be provided. Moreover, the seal member 7,
8 is not provided, by arranging the seal part 32 at the bottom and the wire winding part 31 at the top, rainwater can be prevented from leaking between the seal part 32 and the cover body 6. Even if rainwater enters the rotating portion, the winding portion 31 can prevent the rainwater from entering the rotating portion.

In addition, the illustrated speed change operating device includes a wire guide 12 for the wire W on the base 1, and a clutch spring 9 and one end of the clutch spring 9 engaged between the operating lever 3 and the sleeve 4. A rotation transmission mechanism consisting of a locking groove 10 for locking is provided, and a sound gear 24 having a large number of teeth around the outer periphery is provided between the operating lever 3 and the lever shaft 2;
A sounding mechanism consisting of a sounding pawl 25 that engages with the gear is provided.

The wire guide 12 is formed by extending one side of the support surface 11 of the base 1 outward, and the upper surface of the wire guide 12 is connected to the upper surface of the sealing member 8 supported by the second sealing surface 32b. The wires W are formed at almost the same height, and the wires W are formed on the upper surface.
The guide groove 12a and the outer receiving groove 12b are continuously provided, and the operating wire W, whose one end is locked in the locking part 31a of the lever, is guided from the winding groove 31b to the guide groove 12a, and the wire The outer tube O that guides W is supported in the outer receiving groove 12b. Further, upright pieces 12c, 12c are provided on both sides of the guide groove 12a to prevent the wire W fitted into the guide groove 12a from coming off from the guide groove 12a during assembly.
By making the upper surface of the wire guide 12a almost the same height as the upper surface of the sealing member 8, there is an advantage that the wire W can be led out from the winding section 31 very easily.

Further, the clutch spring 9 of the rotation transmission mechanism is provided with a small-diameter cylindrical portion 41 on the sleeve 4, and is wound around the small-diameter cylindrical portion 41.
is formed by providing an annular inner chamber 34 continuous with the shaft hole 33 at the center of the boss portion 3a of the operating lever 3, and cutting one side of the inner peripheral surface of the annular inner chamber 34 radially outward. It is. One end of the clutch spring 9 is locked in the locking groove 10, and the other end is slidably wound around the small diameter cylindrical portion 41 of the sleeve 4. Further, when the lever 3 is rotated in the direction of pulling the wire W (direction of arrow X in FIG. 4) against the return spring of the transmission, the clutch spring 9 separates from the sleeve 4 and moves the lever 3 away from the sleeve 4. When the operating force is released and the force of the return spring acts on the operating lever 3, it is tightened around the sleeve 4, and the lever 3 becomes integrated with the sleeve 4, and due to the rotational resistance given to the sleeve 4. Return rotation is prevented and the operating lever 3 remains immobile in its operating position. Also, move the operating lever 3 in the direction of restoring the return spring (arrow Y in Figure 4).
direction), the tightening force of the clutch spring 9 increases, and the lever 3 moves toward the sleeve 4.
rotates in unison with the
By releasing the operating force on the lever 3, the lever 3 is kept stationary at that position. Moreover, what is shown in the figure further shows the locking groove 1 in the above configuration.
The circumferential width of the clutch spring 9 is made larger than the width at the bent end 9a of the clutch spring 9 that is locked in the locking groove, and a gap is formed between the locking groove 10 and the bent end 9a of the clutch spring 9. d, and this gap d allows the lever 3 to rotate freely relative to the sleeve 4. Therefore, when the wire W is pulled by the lever 3, the lever 3
This allows for a certain amount of return rotation relative to the amount of traction when the operating force is released. This return rotation amount is such that during a gear change operation, the chain shifts to one side in the thickness direction of the large-diameter sprocket that has been replaced, contacts the adjacent sprocket, and then returns to the center side in the thickness direction of the sprocket that has been replaced. The amount of movement required to do this should be about the same.

Further, the sound gear 24 of the sound mechanism is non-rotatably supported on the front air lever shaft 2, and the sound gear 25 is provided with a recessed portion 35 in one end surface of the boss portion 3a of the lever 3. Then, insert the set screw 26 into the recessed part 35.
It is attached by a leaf spring and is formed by a leaf spring.

As described above, the present invention includes a lever shaft 2 protruding from a base 1 having a support surface 11, and a hub of an operating lever 3 having an inner surface and an outer surface facing the support surface 11 on the lever shaft 2. The boss portion 3a of the lever 3 is provided with a winding portion 31 for the operation wire, and a first annular seal located on the inner surface of the boss portion 3a and facing the support surface 11. On the outer surface side of the surface 32a and the boss portion 3a,
Further, a seal portion 32 having an annular second seal surface 32b located radially outward on the inner side of the winding portion 31 is provided, and an end surface 6a facing the second seal surface 32b is provided. A cover body 6 is formed, and the end surface 6a of this cover body 6 is
Since it is mounted on the base 1 facing the second sealing surface 32b, there is no need to provide a cutout hole in the cover body that allows rotation of the operating lever within a certain range, and it is not necessary to provide a cover for rainwater and dust. This can prevent intrusion into the body and into the boss portion of the operating lever. Therefore, it is possible to prevent the internal parts from rusting due to rainwater, and to maintain smooth operation of the operating lever for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted enlarged vertical cross-sectional view showing an embodiment of the speed change operating device of the present invention, Fig. 2 is a side view, Fig. 3 is a perspective view with the cover removed, and Fig. 4 is an illustration of the operating lever. FIG. 5 is a plan view of only the base, FIG. 6 is a plan view of only the seal member, FIG. 7 is a plan view of only the operating lever, and FIG.
The figure is a plan view of only the seal member. DESCRIPTION OF SYMBOLS 1...Base, 11...Flat support surface, 2...Lever shaft, 3...Operation lever, 3a...Boss part, 31
... Winding section, 32 ... Seal section, 32a ... First
Seal surface, 32b...Second seal surface, 6...Cover body, 7, 8...Seal member.

Claims (1)

[Scope of utility model registration request] A lever shaft 2 is provided protrudingly on a base 1 having a support surface 11, and a boss portion 3a of an operating lever 3 has an inner surface and an outer surface facing the support surface 11 on the lever shaft 2.
The lever 3 has a winding part 31 for the operating wire on the boss part 3a, and a support surface 11 located on the inner surface of the boss part 3a.
on the annular first sealing surface 32a facing the boss portion 3a and on the outer surface side of the boss portion 3a, and on the winding portion 3
A sealing portion 32 having an annular second sealing surface 32b located radially outward on the inner surface side with respect to 1.
and a cover body 6 having an end surface 6a facing the second sealing surface 32b, and the end surface 6a of the cover body 6 facing the second sealing surface 32b, 1. A speed change operation device characterized by being attached to 1.