JPH064435B2 - Brake device for bicycle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle brake device of a type in which an externally tightened or internally expanded brake body mounted on a hub axle is operated by a brake lever of a handle.

<Prior Art> Conventionally, a front wheel and a rear wheel of a bicycle are braked by brake systems of different systems, for example, by operating a right brake lever, a front wheel and a left brake lever are moved. For example, the rear wheels are each braked.

In addition, the left and right mounting bases fixed to both sides of the handle have brake levers swingably mounted, and an inner cable connected to the brake lever and an outer cable on the outer peripheral side for protecting the inner cable. Brake wire is inserted through the insertion portion, the brake wire is orthogonal to the mounting base smoothly and
In order to protect it from damage and the like, a cylindrical base is fitted.

<Problems to be solved by the invention> However, in the case of a motocross bicycle,
In many cases, for the purpose of its use, only the rear wheels are strongly braked without braking the front wheels.
There is a problem in that a braking device of the type that brakes the front and rear wheels, such as a general bicycle, is unsuitable, and the running operation peculiar to motocross cannot be performed.

<Means for Solving Problems> An object of the present invention is to provide a bicycle brake device that does not have the above problems, and only the rear wheel is operated even if either the left or right brake lever is operated. Brakes,
Furthermore, when one of the brake levers is operated, in order to prevent the cap fitted to the other brake lever mounting base from being easily separated from the mounting base due to the reaction force of the brake lever, The base is formed in the shape of a bottomed cylinder, and an elastic body is interposed between the bottom of the base and the end surface of the inserted outer cable. That is, in the first invention, the other end of each inner cable connected to each of the brake levers is connected to an operating portion for moving a brake member of a brake body fixed to a hub axle of a rear wheel. is there.

In the second invention, further, a base of a bottomed tubular body having a communication hole for inserting an inner cable formed in the bottom is inserted into the insertion hole of the mounting base so as to be able to be locked, and is inserted into the base. Between the outer cable end surface of the brake wire and the bottom portion, an elastic member capable of pressing the base against the mounting base is interposed.

<Operation> In the structure thus configured, by operating the left and right brake levers, the inner cables connected to the respective brake levers move and face the brake drum fixed to the rear wheel hub body. The actuating part for moving the provided brake member is rotated. As a result, the brake member is pressed against the brake drum and only the rear wheels are braked.

Further, in this configuration, even if only one brake lever is operated to move the inner cable, the operating portion of the rear wheel is rotated and braking is performed. The inner cable for the other brake lever that is present also moves in the same way. Along with this, the outer cable also moves to the side of the brake lever due to frictional force, and the reaction force causes slack to easily separate the cap, but at this point, the elastic member installed in the cap causes The base is biased so as to be pressed toward the mounting base.

<Example> Below, it demonstrates in detail by the example of illustration.

Reference numeral 1 denotes a frame of a bicycle, which includes an upper pipe 2, a vertical pipe 3, a lower pipe 4, a head pipe 5, and the like. A handle post 6 is rotatably inserted and held in the head pipe 5,
A front wheel 8 is rotatably attached to a lower portion of the front wheel 8 through a front fork 7 by a bearing (not shown). Further, a handle 9 is attached to the upper side of the handle post 6,
On the left and right sides of the handle 9, respective grips 10, 10
The mounting bases 11 and 11 having a symmetrical shape are fixed adjacent to.

As shown in FIG. 3, insertion holes 15 and 15 are formed on the tip side of each mounting base 11, into which a later-described base 36 for inserting the brake wire 14 including the outer cable 12 and the inner cable 13 is fitted. I am doing it. Further, pins 16 and 16 are fixed to the base side of each mounting base 11, and brake levers 17 and 17 having a symmetrical shape are swingably attached to each pin 16. Further, connecting holes 18 and 18 are provided in the respective brake levers 17 in the vicinity of the mounting base 11 side, and each connecting hole 18 is formed at one end of the inner cable 13 of the brake wire 14 inserted into the cap 36. The connection terminal 19 is rotatably fitted, that is, the inner cable 13 and the brake lever 17 are in a connected state.

Reference numeral 20 denotes a brake main body fixed to a hub axle 24 for a rear wheel 23 attached to a connecting portion between the back hawk 21 and the chain stay 22, and the brake main body 20 rotates on the hub axle 24 as shown in FIG. The brake drum 25 is integrally fixed to a hub main body (not shown) of the rear wheel 23 which is freely supported, and has a cylindrical cover 26 that covers the outer periphery of the brake drum 25. A protruding portion 27 is formed to be protruded, and the end portion of the chain stay 22 is connected via a connecting member 29 by a fastening member 28 formed of a bolt and a nut.
It is connected and held by. The brake of this embodiment is of a type generally referred to as an internal expansion type brake, in which the brake main body 20 is provided with a pair of brake members 30 represented by brake shoes or the like, and an operating portion 31 formed by a crank or the like. By rotating the brake member 3
0 are expanded outwardly from each other around the support pin 32 via an actuating member such as a cam (not shown) provided in the actuating portion 31, whereby the brake member 30 is moved to the brake drum 2
5, the rear wheel 23 is braked by being pressed to the inner surface. In addition, the brake shoe of the brake member 30 may be replaced with an externally tightened band brake type using a brake band.

Further, a wire guide 33 is also fixed to the protruding portion 27 by a tightening member 28, and a pair of hollow guide members 34 are attached to the wire guide 33.
An end portion of the outer cable 12 of the brake wire 14 that extends through the base 36 is fixed to this. The inner cables 13, 13 inside each outer cable 12 are
It extends through each guide member 34, and the extended ends thereof are both fixed to the tip of the operating portion 31 of the brake body 20 by a wire tightening screw 35.

Reference numeral 36 denotes a bottomed cylindrical cap fitted into the insertion hole 15 of each mounting base 11, and the cap 36 is shown in FIGS.
As shown in FIG. 7, one is a large diameter portion 37 for inserting the outer cable 12, and the other is formed in a small diameter portion 38 fitted into the insertion hole portion 15. A communication hole 40 is formed in the bottom portion 39 so that the inner cable 13 can be inserted into and retracted from the bottom portion 39. Further, at the outer boundary between the large diameter portion 37 and the small diameter portion 38, the cap 36 for the mounting base 11 is provided. A locking step portion 41 serving as a locking portion is formed. Further, an elastic member 42 such as a coil spring is interposed between the end surface of the outer cable 12 inserted into the large diameter portion 37 of the mouthpiece 36 and the bottom portion 39 of the small diameter portion 38. It is configured to be constantly pressed and held by the mounting base 11 via the locking step portion 41. In addition,
The outer diameter of the mouthpiece 36 may be the same as that of the large-diameter portion 37, and a flange may be provided at a position corresponding to the locking step portion 41 to form the locking step portion, or the insertion hole portion 1 may be used instead of the flange.
A structure may be provided in which a step portion that abuts on the bottom portion 39 of the base 36 and is locked is provided on the member 5. Reference numeral 43 is a metal cap attached to the tip of the outer cable, and 44 is a holding band for fixing each brake wire to the lower pipe or the like.

Next, the operation of the embodiment having the above configuration will be described.

Left and right brake levers 17, 17 while riding a bicycle
When the brake lever 17 is pulled, the brake levers 17 swing about the pins 16 and 16, and the inner cables 13 connected through the connecting terminals 19 by the respective connecting holes 18 move, and accordingly, the outer cables 12 and 12 also moves as shown in FIG. 4, and the elastic member 42 is in a compressed state between the end surface of the outer cable 12 and the bottom portion 39. As shown in FIG. 2, the movement of the inner cables 13, 13 causes the actuating portion 31 of the brake body 20 to rotate in the direction indicated by the arrow A, and the action of an actuating body (not shown) supports the brake members 30, 30. Pin 32,
32 are spread outwardly with respect to each other and are pressed against the inner surface of the brake drum 25 rotating together with the rear wheel 23.
That is, by operating the left and right brake levers 17, 17, only the rear wheel 23 is braked, and a strong braking state is achieved.

After that, when the brake levers 17 are released, a return spring (not shown) attached to the pair of brake members 30 returns the brake members 30, 30 to their original positions to release the braking and the operating portion 31. Also returns to the original position by rotation, and at the same time, each inner cable 13 is also pulled in the opposite direction to the original state. At this time, the outer cables 12, 12 also move to the third position due to the elastic force of the elastic member 42 or the like.
Return to the state shown in the figure, and the brake levers 17, 17
Also returns to its original position.

For convenience of traveling, for example, when only the left brake lever 17 in FIG. 2 is pulled as shown by an arrow B, one inner cable 13 connected to the brake lever 17 is used to operate the operating portion 31 in the same manner as described above. Is arrow A
Is rotated in the direction, the brake members 30, 30 are opened, and the rear wheel 23 is braked. In this case, since the end portion of the inner cable 13 connected to the brake lever 17 on the non-operating side is also fixed to the operating portion 31 by tightening, the inner cable 13 is pushed by the rotation of the operating portion 31 in the arrow A direction. It moves like the other inner cable 13. However, since the brake lever 17 does not move, the reaction force causes slack in the outer cable 12 and the inner cable 13 by the amount of the movement, and the cap 36 easily comes off the mount 11. However, the elastic member mounted in the cap 36 42
As a result, a pressing force to the left side in FIG. 3 acts on the bottom portion 39 of the mouthpiece 36, and as a result, the mouthpiece 36
Is in a state of being pressed and held by the mount 11, and the mount 1
It does not come off by 1. Therefore, the brake wire 14 is always kept orthogonal to the mounting base 11 and does not bend, and the brake wire 14 is guided by the mouthpiece 36 and can be smoothly moved back and forth.

<Effects of the Invention> As is apparent from the above description, according to the present invention, the action of both inner cables due to the operation of the left and right brake levers is cooperatively applied to the brake portion of only the rear wheel, and the effect on the rear wheel A strong braking action is possible, various running unique to motocross can be easily achieved, and the rear wheel can be braked by operating only one of the brake levers, and in this case the mounting base on the other brake lever Despite the slack that occurs in the cable wire, the mouthpiece of is not held at its mounting position and does not come off or come loose due to the pressing action of the internally installed elastic member toward the mounting base. The brake wire that goes in and out of the section is guided by the mouthpiece and is always in a state orthogonal to the mounting base so that it can be smoothly moved back and forth without causing damage or malfunction. There is no such thing.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention. FIG. 1 is an overall front view of a bicycle to which the brake device of the present invention is attached, and FIG. 2 is a left and right brake lever and rear wheel brakes. And FIG. 3 is a partially cut-away front view of the base related to the mounting base, and FIG. 4 is a partially cut-away front view when the brake lever is pulled into the braking state in FIG. 5 is a sectional view of the brake wire taken along the line VV in FIG. 3, FIG. 6 is a partially cutaway front view of the mouthpiece, and FIG. 7 is a side view of the same. 9 ... Handle, 11 ... Mounting base, 12 ... Outer cable, 13 ... Inner cable, 14 ... Brake wire, 15 ... Insertion hole part, 17 ... Brake lever, 20 ... Brake body, 24 ... Hub shaft, 30 ... Brake member, 31 ... Operating part, 36 ... Base, 39 ... Bottom part, 40 ... Communication hole, 42 ... Elastic member.

Claims (2)

[Claims] 1. A brake wire consisting of an outer cable and an inner cable is inserted through insertion holes formed in left and right mounting bases provided on both sides of the handle, and one end of the inner cable is mounted on each mounting base. In a brake device for a bicycle, which is connected to a brake lever that is swingably attached to the brake lever, and each inner cable is moved by the operation of each of the brake levers to perform a brake operation, each of the inner cables connected to each of the brake levers. A brake device for a bicycle, characterized in that the other ends of both are connected to a brake member actuating portion of a brake main body fixed to a hub axle of a rear wheel. 2. A brake wire consisting of an outer cable and an inner cable is inserted through insertion holes formed in the left and right mounts provided on both sides of the handle, and one end of the inner cable is attached to each mount. In a brake device for a bicycle, which is connected to a brake lever that is swingably attached to the brake lever, and each inner cable is moved by the operation of each of the brake levers to perform a brake operation, each of the inner cables connected to each of the brake levers. The other ends of both are connected to the brake member operating part of the brake body, which is fixed to the hub axle of the rear wheel,
Further, a bottomed cylindrical cap having a communication hole for inserting an inner cable at the bottom is fitted to the insertion hole of the mounting base so as to be able to be locked, and the outer cable end surface of the brake wire inserted into the cap. A bicycle brake device, characterized in that an elastic member capable of pressing the base to the mounting base is interposed between the base and the bottom portion.