JPH0249199Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a bicycle gear shift operating device, in particular, a pair of first and second levers each having an operating section on a fixed member are supported in a freely swingable manner. A bicycle speed change operating device comprising: an operating wire connected to one of the levers; and an interlocking mechanism provided between each of the levers to swing the other lever in the opposite direction when one lever is operated. .

(Prior art) Conventionally, as this type of speed change operation device,
As described in Publication No. 43191, a pair of first and second levers each having an operating section at one end are pivotally connected to one lever shaft, and the operating sections of these levers are placed in substantially the same operating position. It is known that the bicycle gear is shifted by selectively pressing one of the levers with a hand holding the grip of the bicycle handlebar.

(Problem that the invention aims to solve) However, when changing gears on a bicycle by changing the chain, starting from a small diameter sprocket with a small number of teeth,
Shift resistance when changing gears by changing a chain to a large diameter sprocket with a large number of teeth, and changing speeds by changing a chain from the large diameter sprocket to a small diameter sprocket, especially when moving the movable side member with a chain guide. In a derailleur equipped with a return spring that biases the direction, there is a difference in shift resistance, so in the case of a conventional structure in which two levers are pivoted to one lever shaft, operation of one lever will affect the other lever. There was a problem that was heavier than the operation.

By the way, by changing the length of each of the levers and increasing the lever ratio on the side that requires heavier operation than the lever ratio on the side that requires easier operation, each lever can be operated with approximately the same operating force. However, in this case, the position of the operating part of each lever is shifted, making it difficult to operate the lever, and also, the operating part of the lever with a longer lever ratio is pushed further outward. There was a problem that stood out and got in the way.

The purpose of this invention is to prevent differences in the lightness and weight of the two lever operations, and also to eliminate deviations in the operation position of the operation part of each lever. .

(Means for Solving the Problems) Therefore, the present invention provides an operation unit 3 in the fixed member 1.
a pair of first and second levers 3 with b, 4b;
4 is supported to swing freely, and an operating wire W is connected to one of the levers 3 and 4, and between each of the levers 3 and 4, when one lever is operated,
A bicycle gear shift operating device is provided with an interlocking mechanism for swinging the other lever in the opposite direction, and the first lever 3 is located at a position away from the operating portion 4b relative to the pivot position of the second lever 4. The operating portions 3b and 4b of the first and second levers 3 and 4 are arranged at substantially the same operating position.

(Function) Since the first lever 3 with a large lever ratio can output a large force to the second lever 4, the first lever 3 performs a gear shifting operation in the direction of greater gear shifting resistance, and By using the second lever 4 to shift gears in the direction of smaller gear shifting resistance, each lever 3, 4 can be operated with approximately the same operating force, and the operating portion of each lever 3, 4 can be operated with substantially the same operating force. Since the levers 3b and 4b are arranged at substantially the same operating position, each lever 3 and 4 can be easily operated, and one of the operating parts does not protrude unnecessarily outward.

(Embodiment) In the figure, reference numeral 1 denotes a fixing member that is fixed via a band member near the handlebar grip of a bicycle, and 3 and 4 are a pair of first and second fixing members that are swingably supported on this fixing member 1. The fixing member 1 is a two-lever lever, and the fixing member 1 is made of a horizontally elongated plate, one lengthwise end of which is formed integrally with a part of the band member 2, and a support piece 11 is provided at the other end.

Further, each of the levers 3 and 4 includes boss portions 3a and 4a that are pivotally connected to the fixing member 1, and boss portions 3a and 4 that are pivotally connected to the fixing member 1.
It consists of operation parts 3b and 4b extending outward from a, and shaft holes 31 and 41 are provided in each of the boss parts 3a and 4a.

However, in the embodiments shown in FIGS. 1 to 4,
The boss portion 4a of the second lever 4 is pivotally connected to the fixing member 1 via a second lever shaft 6 inserted into a shaft hole 41 provided in the boss portion, while the boss portion 3a of the first lever 3 is pivotally connected to the pivot position P2 of the second lever ₄ at a position away from the insertion part 4b via the first lever shaft 5 inserted into the shaft hole 31 provided in the boss part, and this first The operation parts 3b and 4b of the lever 3 and the second lever 4 are arranged at substantially the same operation position, and the pivot positions of the levers 3 and 4 are
Between P ₁ and P ₂ , when the first lever 3 is operated, the second
An interlocking mechanism 7 is provided that swings the lever 4 in the opposite direction and swings the first lever 3 in the opposite direction when the second lever 4 is operated.

In the above configuration, each of the levers 3 and 4 is
By arranging them in parallel on one side of the fixing member 1, by arranging each of the operation parts 3b and 4b in a vertically displaced position near the grip, and by extending the thumb from the position where the grip is gripped, Each operation part 3b, 4
b can be operated by pressing down.

Further, the interlocking mechanism 7 includes an engagement recess 71 provided on the first lever 3 and an engagement protrusion 72 provided on the second lever 4, and slides through the engagement recess 71 and the engagement protrusion 72. The first and second levers 3 and 4 are engaged so that the swinging motion of one of the levers 3 and 4 is forcibly transmitted to the other.

Further, a spring 8 is provided between the first lever 3 and the fixing member 1 to bias the first lever 3 in the counterclockwise direction in FIG. to ensure that they are always engaged.

Further, a cylindrical bushing 9 is fitted into the shaft hole 41 of the second lever 4 as shown in FIG.
Screw the nut 10 onto the threaded end of the lever shaft 6,
By tightening this nut 10, the second lever 4
It is designed to provide a predetermined resistance to the rotation of the

Further, the boss portion 4a of the second lever 4 is provided with a support hole 42 for supporting a tycoon fixed to one end of the operating wire W, and a wire guide groove continuous with the support hole 42.

In the figure, 20 is a washer, and 0 is an outer tube for guiding the wire W, one end of which is supported by the support piece 11.

The speed change operating device configured as described above is used with a derailleur equipped with a return spring, an operating cable consisting of an operating wire and an outer tube that guides the wire, but it can also be used with a derailleur not equipped with a return spring. You can.
In this case, the wire W is mainly a so-called push-pull wire with a small amount of deflection.

When the operating portion 3b of the first lever 3 is pressed down from the state shown in FIG. 1 and the first lever 3 is swung clockwise around the first lever shaft 5, the first
The movement of the lever 3 is caused by the engagement recess 71 and the engagement protrusion 7.
2 to the second lever 4, which swings counterclockwise in FIG. 1 about the second lever shaft 6, and the operating wire W supported by the second lever 4 is , it is pushed towards the derailleur side,
Also, after operating the first lever 3 as described above, the fifth lever
When the operating portion 4b of the second lever 4 is pushed down from the state shown in the figure and the second lever 4 is swung clockwise around the second lever shaft 6, the operating wire W supported by the second lever 4 is It is being towed. Further, the movement of the second lever 4 is transmitted to the first lever 3 via the engagement convex portion 72 and the engagement recess 71, and the first lever 3 is moved in a direction opposite to that shown in FIG. It swings clockwise.

Therefore, the first lever 3 is connected to the second lever 4.
The operation part 4b of the second lever 4 for the pivot position P _{2 of}
The lever ratio of the first lever 3 is the same as that of the second lever 4.
Since it is longer than the lever ratio of , if the operating force input to each of the levers 3 and 4 is the same,
The first lever 3 can output a large force to the second lever 4.

Therefore, by using the first lever 3 to shift gears in the direction of greater gear shifting resistance, and by using the second lever 4 to shift gears in the direction of smaller gear shifting resistance, each lever 3, 4 can be moved approximately. The levers 3 and 4 can be operated with the same operating force, and since the operating portions 3b and 4b of each of the levers 3 and 4 are located at substantially the same operating position, each lever 3 and 4 can be operated easily, and Therefore, the operation part of the first lever 3, which has a large lever ratio, does not need to protrude outward.

In the embodiment described above, the interlocking mechanism 7 consisting of the engagement recess 71 and the engagement protrusion 72 was used.
In addition, the structure of the interlocking mechanism 7 is not particularly limited, and may be a meshing structure having toothed portions, for example. In short, when operating one lever,
Any structure may be used as long as the other lever is swung in the opposite direction.

Further, each of the levers 3 and 4 may be provided with a positioning mechanism between it and the fixed member 1 to maintain the operating position, or if the derailleur is provided with a chain guide positioning mechanism, The operating position of each of the levers 3 and 4 may be maintained using this derailleur positioning mechanism.

Furthermore, the speed change operation device of the present invention may be used together with a derailleur equipped with a return spring. In this case, a normal wire with a large amount of deflection may be used as the wire W.

(Effect of the invention) As described above, the present invention enables the second
The first lever 3 that interlocks with the lever 4 is pivoted to a position away from the operating portion 4b of the second lever 4 relative to the pivot position of the second lever 4, and the lever ratio of the first lever 3 is adjusted to the first lever ratio. Since the lever ratio of the two levers 4 is longer than the lever ratio, and the operating parts 3b and 4b of the first and second levers 3 and 4 are arranged at substantially the same operating position, the shift resistance in the direction where the gear shifting resistance is large is increased. By performing a gear shift operation using the first lever 3 and performing a gear shift operation in the direction of smaller gear shift resistance using the second lever 4, each lever 3, 4 can be operated with approximately the same operating force. Moreover, the levers 3 and 4 are easy to operate. Further, the operating portion 3b of the first lever 3 does not protrude excessively outward.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted front view showing one embodiment of the present invention's shift operating device, Fig. 2 is a plan view, Fig. 3 is an exploded perspective view of only the first and second levers, and Fig. 4 is an exploded perspective view of only the first and second levers. FIG. 5 is a sectional view of the pivoting portion of the second lever, and is an explanatory view showing the operating state. DESCRIPTION OF SYMBOLS 1... Fixed member, 3... First lever, 4... Second lever, 3b, 4ba... Operating unit.

Claims (1)

[Scope of utility model registration request] A pair of first and second levers 3 and 4 having operation parts 3b and 4b are supported on a fixed member 1 so as to be freely swingable,
An operating wire W is connected to one of these levers 3 and 4, and between each lever 3 and 4,
A bicycle gear shift operating device is provided with an interlocking mechanism that swings the other lever in the opposite direction when one lever is operated, and the first lever 3 is moved relative to the pivot position of the second lever 4. The first and second
A bicycle gear shift operating device characterized in that operating parts 3b and 4b of levers 3 and 4 are arranged at substantially the same operating position.