JPS6230876Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to a gear shift operating device for use in bicycles, and more particularly to a gear shifting operating device for operating a front derailleur and a rear derailleur.

Generally, in a bicycle, as shown in Fig. 8, a front chain gear _G1 provided on the crank and a rear chain gear _G2 provided on the rear wheel side are multi-stage, and a front derailleur _D1 and a rear derailleur _D2 are controlled by a speed change operation device. The chain c is operated and guided by the chain guides d ₁ and d ₂ of these derailleurs.
When shifting the chain in the axial direction of each of the chain gears and changing the chain to one of the multi-stage front chain gear and multi-stage rear chain gear, as shown in FIG. Because of the large inclination between gear _G1 and rear chain gear _G2 , the chain c came into contact with the chain guide _d1 of the front derailleur _D1 , causing noise.

Therefore, conventionally, of the front lever and rear lever that are rotatably supported on a fixed member, the lever shaft of the front lever is movable in a direction perpendicular to the axis, while the lever axis of the rear lever is moved with respect to its rotation center. In addition to providing an eccentric cam, a straight guide groove that engages with the eccentric cam is provided on the lever shaft of the front lever, and by engagement with the guide groove of the eccentric cam, rotation of the rear lever is converted into linear motion. Then, the command is transmitted to the front lever to slightly move the front lever linearly in a direction perpendicular to its center of rotation, and the chain guide of the front derailleur is pulled or loosened by pulling or loosening the operating wire connected to the front lever. A speed change operating device has been proposed which is configured to slightly displace the chain guide in the rear derailleur in the same direction as the operating direction to prevent the chain from coming into contact with the front chain guide.

However, since this conventional gear shift operating device converts the rotational motion of the rear lever into linear motion and causes the front lever to move linearly, it is not possible to operate the front lever smoothly.
The movement of the front lever is heavy, which causes a large load to act on the rear lever, which has the drawback of being heavy to operate, and the transmission part from the rear lever to the front lever and the sliding part of the front lever against the fixed member are subject to severe wear. Therefore, it is necessary to use a wear-resistant member or to supplement it with this wear-resistant member, which has the drawback of increasing costs, and also providing a long hole in the fixed member for linear movement of the front lever. As a result, a portion of this elongated hole is exposed to the outside, and rainwater and dust enter the interior through the elongated hole portion, resulting in a disadvantage that the operability of the front lever and rear lever becomes poor.

The present invention was devised in view of the above-mentioned drawbacks of the conventional technology.The purpose of this invention is to make it possible to operate the rear lever easily, to reduce wear on the transmission part that transmits the movement of the rear lever to the front lever, and to prevent rainwater and dust from entering inside. The object of the present invention is to provide a speed change operation device that can prevent the intrusion of foreign matter.

Therefore, in the present invention, a lever support body having a lever shaft of a front lever that operates the front derailleur and a lever shaft of a rear lever that operates the rear derailleur is attached to the fixed member so as to be perpendicular to each of the lever shafts. The front lever and the rear lever are rotatably supported on each lever shaft in this lever support body, and the rotation of the rear lever is supported between the rear lever and a fixed member. The present invention is characterized in that a rotation mechanism for rotating the lever support by a predetermined angle is provided, so that when the rear lever is operated, the front lever is displaced via the lever support.

Embodiments 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 has a lever shaft 21 of a front lever 3 that operates a front derailleur D ₁ and a lever shaft of a rear lever 4 that operates a rear derailleur D ₂ attached to a fixed member 1 fixed to, for example, a top tube of a bicycle frame. 22, and supports the lever support 2 with
The front lever 3 and the rear lever 4 are rotatably supported on each of the lever shafts 21 and 22. Incidentally, screw holes 21a and 22a are provided at the center of the lever shafts 21 and 22.

Thus, the lever support body 2 is rotatably supported via the support shaft 11 in a direction perpendicular to the lever shafts 21 and 22, and the rear lever 4
A rotation mechanism 5 is interposed between the rear lever 4 and the fixed member 1 to rotate the lever support 2 by a predetermined angle with respect to the fixed member 1 when the rear lever 4 is rotated. The front lever 3 is made to be displaced via the body 2.

In the above configuration, the fixing member 1 is made of a narrow and long metal plate, and the cylindrical support shaft 11 that supports the lever support 2 is provided at the intermediate portion in the longitudinal direction.
and a pair of upright pieces 12 and 13 protruding in the same direction as the support shaft 11, respectively, a projection 14 is provided at one end in the length direction, and a through hole 15 for receiving the projection 14 is provided at the other end. It is attached to the bicycle frame by fitting the protrusion 14 into the through hole 15, and a screw 11a is provided on the inner peripheral surface of the support shaft 11, and a square pedestal 16 is provided at the base.
The upright pieces 12 and 13 are provided on both side edges of the pedestal 16.

Moreover, the front lever 3 and the rear lever 4
is a shaft hole 3 provided at the center of the boss portions 3a, 4a.
The boss portions 3a, 4a of each lever are fitted into the lever shafts 21, 22 so as to rotate freely.
Disc-shaped upper lids 7, 7 having through holes are arranged on the outside through washers 6, 6, and tightening screws 8, 8, which are inserted into the upper lids 7, 7 through washers, are attached to the lever shafts 21,
By screwing into the screw holes 21a and 22a of 22, a predetermined rotational resistance is applied to each of the levers 3 and 4.

Further, the lever support body 2 is provided with a through hole 23 for receiving the support shaft 11 in the center thereof, and has the lever shafts 21 and 22 protruding from both sides in a direction perpendicular to the axis of the through hole 23. are doing.
The lever support 2 is rotatably supported by fitting the through hole 23 into the support shaft 11.
3 is screwed into the screw 11a of the support shaft 11 via a washer, thereby pressing the lever support 2 against the pedestal 16 of the fixing member 1.
A predetermined rotation resistance is applied to the lever support body 2. Incidentally, the lever shafts 21 and 22 may be formed separately from the lever support body 2 and may be attached to the lever support body 2 in a non-rotatable manner.

The rotation mechanism 5 also includes an annular cam plate 51 having a pair of circumferentially inclined cam surfaces 51a and 51b, and cam surfaces 51a and 51 of this cam plate 51.
The cam plate 51 is formed by a pair of engaging bodies 52, 53 that engage with the rear lever 4, and is provided, for example, on the inner surface of the boss portion 4a of the rear lever 4 so as to be non-rotatable relative to each other. The cam surfaces 51a, 5 on the cam plate 51 are provided on the upright pieces 12, 13 of the fixed member 1, and the cam surfaces 51a, 5 on the cam plate 51 are rotated by the rotation of the rear lever 4.
The lever support 2 is forcibly rotated with respect to the fixed member 1 by changing the engagement position of the lever 1b with the engagement bodies 52 and 53. In addition, the cam plate 51 and the engaging body 5
2, 53 may be provided oppositely.

The cam plate 51 has a lower flat surface 51c on one side thereof, as shown in FIGS. Cam surface 51a, 5
1b is provided, and when the rear lever 4 rotates, the one side cam surface 5
1a and the engagement body 52, the engagement position thereof is displaced from the high side to the low side, and the engagement position of the other side cam surface 51b and the engagement body 53 is such that the engagement position is displaced from the low side to the high side. For example, set rear lever 4 to 100.
When the lever is rotated by 11 degrees, the lever support 2 and, by extension, the front lever 3 are displaced by about 11 degrees.

Further, the engaging bodies 52 and 53 are held in the holding holes 12a and 13a provided in the upright pieces 12 and 13 so as to be able to roll by using rolling elements such as balls or rollers, but other than the rolling elements are used. It may be formed of a member and fixed to the upright pieces 12, 13, or may be formed integrally with the upright pieces 12, 13.

The present invention is constructed as described above, and as is known, the front lever 3 and the rear lever 4 are connected to the chains of the front derailleur D ₁ and the rear derailleur D ₂ via the first and second operating wires W ₁ and W ₂ . The front lever 3 and the rear lever 4 are connected to movable members having guides d ₁ and d ₂ respectively, and are connected to the operating wires W ₁ and W ₂ against return springs (not shown) in the derailleurs D ₁ and D _{2 .} By operating the chain guides d ₁ and d ₂ forward in the pulling direction (arrow X direction in FIG. 2), the front lever 3 and the rear lever 4 are moved.
By performing a backward movement operation in the loosening direction of the operating wires W ₁ and W ₂ (arrow Y direction in FIG. 2), the chain guides d ₁ and d ₂ are moved back by the force of the return spring to a predetermined position. It changes gears.

When the rear lever 4 is rotated, for example, in the forward direction, the cam surfaces 51a, 5 of the cam plate 51
1b and the engaging bodies 52, 53 gradually change, and the lever support 2 rotates in the direction of arrow A in FIG. 1. When the rear lever 4 is rotated by 100 degrees, the lever support 2 rotates approximately 11 degrees. The front lever 3 supported by the lever support 2 is displaced in the loosening direction of the first operating wire _W1 (in the direction of arrow A in FIG. 1), and due to the displacement of the front lever 3, the first operating wire W1 is loosened. ₁
is loosened and the front derailleur D ₁
The chain guide _d1 is slightly displaced in the backward motion direction (direction of arrow E in FIG. 9) by the force of the return spring. Therefore, even if the inclination angle of the chain line becomes large by operating the rear lever 4, it is possible to prevent the chain c from coming into contact with the chain guide _d1 .

Further, when the rear lever 4 is rotated in the backward direction, the engagement positions of the cam surfaces 51a, 51b of the cam plate 51 and the engaging bodies 52, 53 gradually change, and the lever support 2 moves as shown by the arrow in FIG. If the rear lever 4 is rotated by 100 degrees in direction B,
The lever support 2 rotates through 11 degrees.

The front lever 3 supported by the lever support 2 is displaced in the direction of pulling the first operating wire W ₁ (in the direction of arrow B in FIG. 1), and the displacement of the front lever 3 causes the first operating wire W 1 to be pulled.
While the W ₁ is being towed, the front derailleur
The chain guide d ₁ of D ₁ is slightly displaced in the forward movement direction (direction of arrow F in FIG. 9) against the force of the return spring. Therefore, even if the angle of inclination of the chain line of the chain C increases by operating the rear lever 4, it is possible to prevent the chain C from coming into contact with the chain guide _d1 .

Further, when the front lever 3 is rotated and inserted in the forward or backward direction, only the front lever 3 overcomes the rotational resistance of the front lever 3 and rotates.

As described above, the present invention transmits the rotational movement of the rear lever to the lever support that supports the front lever via the rotational movement mechanism and displaces the front lever. Therefore, the rotational movement is converted into linear movement and the front lever is moved. Compared to a sliding structure, the rear lever can be operated easily.

Moreover, since a rotational movement mechanism is used, wear in the transmission portion can be reduced, and there is no need to use or supplement with a wear-resistant member, making it possible to provide the device at a lower cost as a whole.

In addition, since the lever support that supports the front lever is rotated by the rotation of the rear lever, and the front lever is displaced, there is no need to provide a long hole for sliding the front lever in the fixed member as in the conventional case, so rainwater etc. This prevents dust from entering the fixing member, and allows the front lever and rear lever to rotate smoothly over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view showing an embodiment of the present invention;
Fig. 2 is a front view, Fig. 3 is a sectional view taken along the line of Fig. 2, Figs. 4 to 6 show only the cam plate, Fig. 4 is a front view, Fig. 5 is a right side view, FIG. 6 is a left side view, FIG. 7 is a partial perspective view of only the fixing member, and FIGS. 8 and 9 are explanatory diagrams showing the relationship among the chain gear, derailleur, and chain. 1...Fixing member, 2...Lever support, 3...
Front lever, 4... Rear lever, 5... Rotating mechanism, D ₁ ... Front derailleur, D ₂ ...
...Rear dayrailer.

Claims (1)

[Scope of utility model registration request] A speed change operating device for operating a front derailleur and a rear derailleur, wherein a fixed member includes a lever shaft of a front lever for operating the front derailleur and a lever shaft for a rear lever for operating the rear derailleur. A lever support body with a wobble is rotatably supported via a support shaft extending perpendicularly to each of the lever shafts, and the front lever and rear lever are rotatably supported on each lever shaft of the lever support body, and A rotation mechanism is interposed between the rear lever and the fixed member to rotate the lever support body by a predetermined angle by rotation of the rear lever, and when the rear lever is operated,
A speed change operating device characterized in that the front lever is displaced via the lever support.