JP3811295B2 - Bicycle brake device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bicycle brake device, and more particularly, a first brake for braking one of a front wheel and a rear wheel, a second brake for braking the other of a front wheel and a rear wheel, and the first brake to operate independently. A first brake lever coupled to the first brake via a first Bowden wire, and second and third Bowden wires respectively connected to the first and second brakes to simultaneously operate the first and second brakes. The present invention relates to a brake device comprising a second brake lever connected via
[0002]
[Prior art]
Conventionally, as a bicycle brake device, a front and rear wheel brake interlocking type in which a front wheel brake and a rear wheel brake are operated in conjunction with each other is disclosed in, for example, Japanese Patent Laid-Open No. 5-16862. What is disclosed in this publication is that the front and rear wheel brakes can be interlocked to brake the front and rear wheels at the same time, regardless of whether the left or right brake lever provided on the steering handle of the bicycle is operated. Yes.
[0003]
[Problems to be solved by the invention]
However, with this conventional front / rear wheel brake interlocking type, either the left / right brake levers operate in the same way, and the front / rear wheel brakes operate simultaneously. The braking balance of the front and rear wheels cannot be adjusted depending on the driving conditions, and it is difficult to say that the operability and the braking feeling are good.
[0004]
The present invention has been made in view of such circumstances, so that a mode in which one wheel is braked independently and a mode in which the front and rear wheels are simultaneously braked can be selected according to the traveling conditions, and the operability and braking are improved. An object of the present invention is to provide a bicycle brake device having a good feeling.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a first brake for braking one of the front wheels and the rear wheel, a second brake for braking the other of the front wheels and the rear wheel, and the first brake for independently operating the first brake. A first brake lever connected to the first brake via a first Bowden wire, and a second and a third Bowden wire for the first and second brakes, respectively, to simultaneously operate the first and second brakes. The first brake is connected to the bicycle by means of a first arm part and a first knocker part that are pivotally supported relative to each other, and a brake operating force is applied to the first knocker part. A first brake arm comprising first relative rotation restricting means for preventing the relative rotation of the first arm portion and the first knocker portion and transmitting the brake operating force to the first arm portion when in front A first brake shoe attached to the first arm portion and opposed to one side surface of one rim of the front wheel and the rear wheel; a second arm portion and a second knocker portion pivotally supported relative to each other; In addition, when a brake operation force is applied to the second knocker portion, the second arm portion and the second knocker portion are prevented from rotating relative to each other, and the brake operation force is transmitted to the second arm portion. And a second brake shoe attached to the second arm portion and facing the other side of the rim, and an inner wire of the first Bowden wire is connected to the first knocker portion. An outer wire of the first Bowden wire is connected to the second arm portion, and a brake operation force applied to the first brake lever is applied to the first knocker portion and the first relative rotation regulation. While transmitting to said 1st arm part via a means and transmitting to said 2nd arm part, said 1st and 2nd brake shoes are made to operate on said 1st brake by pinching to said rim. A part of the brake operation force applied to the second brake lever by connecting the inner wire of the second Bowden wire to the second knocker portion and connecting the outer wire of the second Bowden wire to the first arm portion. Is transmitted to the second arm portion via the second knocker portion and the second relative rotation restricting means, and is transmitted to the first arm portion to clamp the first and second brake shoes on the rim. By actuating the first brake, the other part of the brake operating force applied to the second brake lever is simultaneously applied to the second brake wire via the third Bowden wire. The first feature is that the second brake is operated by transmitting to the brake.
[0006]
According to the first feature, when the first brake lever is operated, the operating force is transmitted to the first arm portion and the second arm portion via the first knocker portion and the first relative rotation restricting means. Thus, the first and second brake shoes are clamped by the rim of one wheel. That is, only one wheel can be braked by the single operation of the first brake.
[0007]
Further, when the second brake lever is operated, the operating force is transmitted to the second arm portion and the first arm portion via the second knocker portion and the second relative rotation restricting means. The second brake shoe is clamped on the rim of one wheel. At the same time, the operating force is transmitted to the second brake via the third Bowden wire. That is, the front and rear wheels can be braked simultaneously by the interlocking operation of the first and second brakes.
[0008]
According to the present invention, in addition to the above feature, the second arm portion is rotated between the first knocker portion and the second arm portion so that the second brake shoe is opened with respect to the first brake shoe. The first brake shoe is interposed between the second knocker portion and the first arm portion, and is provided with a first return spring that urges the first brake lever to rotate and urges the first brake lever to an inoperative position. And a second return spring for rotating and urging the first arm so as to open the second brake shoe with respect to the second brake shoe. Is the second feature.
[0009]
According to the second feature, it is possible to prevent rattling of each brake lever by returning each brake lever and brake shoe to the inoperative position with a simple structure.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.
[0011]
FIG. 1 is a side view of a bicycle equipped with a brake according to the present invention, FIG. 2 is a front view showing a single braking system and an interlocking braking system in the brake device, and FIG. 3 is an exploded perspective view of a main part of the brake device. 4 is an enlarged view around the second brake lever of FIG.
[0012]
First, in FIG. 1, the bicycle brake device of the present invention includes a first brake 3 that brakes the front wheel 2 of the bicycle 1 and a second brake 5 that brakes the rear wheel 4.
[0013]
As shown in FIGS. 2 and 3, the first brake 3 includes two first and second brake arms 6, 7, and the first and second brake arms 6, 7 are respectively connected to the first brake arm 6, 7. The first and second arm portions 8 and 9 and the first and second knocker portions 10 and 11 are divided.
[0014]
Fixing fulcrum holes 12 and 13 are attached to one end of each of the first and second arm portions 8 and 9, and first and second brake shoes 14 and 15 (shown in FIG. 2) are attached to the other ends. The holes 16 and 17 are respectively drilled. Further, one end of each of the first and second arm portions 8 and 9 protrudes to the opposite side to the mounting side of the first and second brake shoes 14 and 15 with respect to the fixed fulcrum holes 12 and 13, respectively. First and second rotation restricting portions 18 and 19 are provided. Further, the first and second arm portions 8 and 9 have first and second brackets 20 and 9 at intermediate positions between the fixed fulcrum holes 12 and 13 and the brake shoes 14 and 15 mounting holes 16 and 17, respectively. 21 is integrally formed. Support brake members 22 and 23 are attached to attachment holes 24 and 25 provided at the distal ends of the first and second brackets 20 and 21, respectively, and thereby the outer wires 43 and 39 of the first and second Bowden wires 42 and 38. Are each supported.
[0015]
Also, a fixed fulcrum hole (not shown) that aligns with the holes 12 and 13 of the arm portions 8 and 9 is attached to each end of the first and second knocker portions 10 and 11, and is attached to each other end. The holes 28 and 29 are formed, and the inner wires 44 and 40 of the first and second Bowden wires 42 and 38 are fixed by the wire fixing members 26 and 27 attached to the mounting holes 28 and 29, respectively.
[0016]
Further, first and second stepped portions 30 and 31 are formed on the fixed fulcrum hole side of the first and second knocker portions 10 and 11.
[0017]
Then, as shown in FIG. 3, the first arm portion 8 and the first knocker portion 10 are aligned with the fixed fulcrum hole 12 of the first arm portion 8 and the fixed fulcrum hole of the first knocker portion 10. In addition, the second arm portion 9 and the second knocker portion 11 are aligned with the fixed fulcrum hole 13 of the second arm portion 9 and the fixed fulcrum hole of the second knocker portion 11 as shown in FIG. In this way, bolts 32 are inserted into the fixed fulcrum holes 12 and 13, and the bolts 32 are screwed to the front fork 1 a of the bicycle 1. Thus, the two brake arms 6, 7 combining the first and second arm portions 8, 9 and the first and second knocker portions 10, 11 are rotatable with the bolt 32 as a fixed fulcrum.
[0018]
At this time, the first arm portion 8 and the first knocker portion 10 are connected so as to be relatively rotatable, and the second arm portion 9 and the second knocker portion 11 are connected so as to be relatively rotatable. In that case, the first and second rotation restricting portions 18 and 19 of the first and second arm portions 8 and 9 are opposed to the first and second step portions 30 and 31 of the first and second knocker portions 10 and 11. When the brake operation is performed and the first and second knocker portions 10 and 11 rotate upward relative to the first and second arm portions 8 and 9, respectively, the first and second rotations are performed. When the restricting portions 18 and 19 abut and engage with the first and second step portions 30 and 31, the first and second knocker portions 10 and 11 are in contact with the first and second arm portions 8 and 9, respectively. Further upward relative rotation is restricted. That is, the first rotation restricting portion 18 and the first step portion 30 constitute the first relative rotation restricting means 33 in the first brake arm 6 of the present invention, and the second rotation restricting portion 19 and the first step restricting portion 30. The two step portions 31 constitute second relative rotation restricting means 34 in the second brake arm 7 of the present invention.
[0019]
As shown in FIG. 2, mounting flanges 16 and 17 are integrally formed at the ends of the arm portions 8 and 9, and the first and second brake shoes 14 and 15 are fixed to these by bolts. The brake shoes 14 and 15 can brake the front wheel 2 by clamping the rim 37 of the front wheel.
[0020]
A first return spring 41 is contracted between the support member 22 attached to the first bracket 20 and the support member 27 attached to the second knocker portion 11, and the first return spring 41 and the support member 23 attached to the second bracket 21 A second return spring 45 is contracted between the support member 26 attached to the 1 knocker portion 10.
[0021]
As shown in FIG. 2, a first brake lever 47 is pivotally supported by a lever holder 46 fixed adjacent to the right grip of the steering wheel 1b of the bicycle. The other end of the outer wire 43 of the first Bowden wire 42 is supported on the lever holder 46, and the other end of the inner wire 44 of the first Bowden wire 42 is connected to the first brake lever 47. The first brake lever 47 and the first Bowden wire 42 constitute a single braking system for braking only the front wheel 2 as will be described later.
[0022]
As clearly shown in FIG. 4, a second brake lever 49 is pivotally supported by a lever holder 48 fixed adjacent to the left grip of the steering handle 1b, and adjacent to the second brake lever 49. Thus, the equalizer chamber 55 is formed in the lever holder 48. One end of the rod 50 is pivotally attached to the second brake lever 49, and an intermediate portion of the equalizer lever 51 accommodated in the equalizer chamber 55 is pivotally attached to the other end of the rod 50. The other end of the inner wire 40 of the second Bowden wire 38 is pivotally attached to one end of the equalizer lever 51, and the other end of the outer wire 39 of the second Bowden wire 38 is supported on the cover plate 56 of the equalizer chamber 55. . Further, one end of the inner wire 53 of the third Bowden wire 52 is pivotally attached to the other end of the equalizer lever 51, and one end of the outer wire 54 of the third Bowden wire 52 is supported by the lid plate 56. The other end of the third Bowden wire 52 is connected to a second brake 5 that brakes the rear wheel.
[0023]
In the equalizer lever 51, the distance a1 between the pivot point of the rod 50 and the pivot point of the inner wire 40 of the second Bowden wire 38, the pivot point of the rod 50, and the inner wire 53 of the third Bowden wire 52 The distance a2 to the pivot point is set according to the following equation.
[0024]
a1> a2
Preferably,
a1: a2 = 7: 3
Incidentally, by accommodating the equalizer lever 51 in the equalizer chamber 55, the equalizer 51 can be protected from contact with other objects and rainwater, and its durability can be enhanced.
[0025]
The second brake 5 is a conventionally known one. Although not shown, the second brake 5 is connected to each other so as to be rotatable relative to each other, and includes two brake arms provided with a brake shoe. One brake arm has a third brake arm. The other end of the inner wire 53 of the Bowden wire 52 is supported, and the other end of the outer wire 54 of the third Bowden wire 52 is supported by the other brake arm. The second brake lever 49, the rod 50, the equalizer lever 51, the first Bowden wire 38 and the third Bowden wire 52 constitute an interlocking braking system that interlocks and brakes the front and rear wheels 2 and 4, as will be described later. Yes.
[0026]
Next, the operation of this embodiment will be described.
[0027]
In the non-operating state of the brake device of the present invention, as shown in FIG. 2, the first and second brake shoes 14, 15 of the first brake brake 3 are separated from the rim 37 of the front wheel 2, and the first and second brake shoes are separated. The first and second step portions of the first and second knocker portions 10 and 11 and the first and second rotation restricting portions 18 and 19 of the first and second arm portions 8 and 9 of the two brake arms 6 and 7. 30 and 31 are in contact with each other.
[0028]
When only the front wheel 2 is braked by the single braking system, when the first brake lever 47 is rotated, the operating force is transmitted to the first brake arm 6 and the second bracket 21 via the first Bowden wire 42, The first knocker portion 10 of the first brake arm 6 rotates counterclockwise in FIG. 2, and the second arm portion 9 of the second brake arm 7 rotates clockwise in FIG. Is compressed. In the counterclockwise rotation of the first knocker portion 10, first relative rotation restricting means 33 including the first step portion 30 of the first knocker portion 10 and the first rotation restricting portion 18 of the first arm portion 8. Is engaged, the rotation of the first knocker portion 10 is transmitted to the first arm portion 8 via the first step portion 30 and the first rotation restricting portion 18, and the first arm portion 8 is also counterclockwise. Rotate in the direction. As a result, the first and second arm portions 8 and 9 move toward each other, and the first and second brake shoes 14 and 15 clamp the rim 37, so that the front wheel 2 is braked.
[0029]
At this time, when the first arm portion 8 is rotated in the counterclockwise direction, the first bracket 20 is also rotated in the counterclockwise direction, so that the second brake arm is interposed via the first return spring 41 on the second Bowden wire 38 side. 7 second knocker portion 11 receives a force to rotate counterclockwise. In the second brake arm 7, when the second arm portion 9 is rotated in the clockwise direction and the second knocker portion 11 is rotated in the counterclockwise direction, Since the second relative rotation restricting means 34 composed of the second stepped portion 31 of the second knocker portion 11 is not engaged, the second knocker portion 11 freely rotates counterclockwise. Thus, even when the second knocker portion 11 receives a force in the counterclockwise direction from the first bracket 20 via the first return spring 41, the first return spring 41 is not compressed and is bent. The Bowden wire 38 is simply displaced to absorb the influence of the rotation of the first arm portion 8. Therefore, even if the first brake lever 47 is operated, the second brake lever 49 is not affected by the second Bowden wire 38 and can maintain a non-operating position without rattling, and the rear wheel 4 The second brake 5 is not braked. Thus, by operating the first brake lever 47, only the first brake 3 is actuated and only the front wheel 2 is braked.
[0030]
When the first brake lever 47 is released, the brake operating force transmitted to the first knocker portion 10 and the second arm portion 9 via the first Bowden wire 42 is released, so that the compressed second return spring 45 The first knocker portion 10 of the first brake arm 6 is rotated in the clockwise direction in FIG. 2 and the second arm portion 9 is rotated in the counterclockwise direction by the spring force. At this time, since the first rotation restricting portion 18 and the first stepped portion 30 are separated from each other and the engagement of the first relative rotation restricting means 33 is released, the first arm portion 8 becomes free. As a result, the first and second brake shoes 14, 15 are opened to release the rim 37, so that the braking of the front wheel 2 is released. At the same time, the first bowden wire 42 also returns to the non-operating position by the restoring force of the second return spring 45, and the first brake lever 47 returns to the non-operating position by the return of the first bowden wire 42 to the non-operating position. Return.
[0031]
On the other hand, when the front and rear wheels 2 and 4 are interlocked and braked by the interlocking braking system, when the second brake lever 49 is rotated, the operating force is applied to the first and third Bowden wires 38 and 52 at the equalizer lever 51. It is distributed and transmitted at a lever ratio (determined by distances a1 and a2). With the operating force transmitted to the second Bowden wire 38, the second knocker portion 11 of the second brake arm 7 rotates clockwise in FIG. The first arm portion 8 of the first brake arm 6 rotates counterclockwise in FIG. 2, and the first return spring 41 is compressed. In the clockwise rotation of the second knocker portion 11, the second relative rotation restricting means 34 including the second step portion 31 of the second knocker portion 11 and the second rotation restricting portion 19 of the second arm portion 9 is provided. Because of the engagement, the rotation of the second knocker portion 11 is transmitted to the second arm portion 9 via the second step portion 31 and the second rotation restricting portion 19, and the second arm portion 9 is also rotated in the clockwise direction. Rotate. As a result, the first and second arm portions 8 and 9 move toward each other, and the first and second brake shoes 14 and 15 clamp the rim 37, so that the front wheel 2 is braked.
[0032]
At this time, when the second arm portion 9 is rotated in the clockwise direction, the second bracket 21 is also rotated in the clockwise direction, so that the first brake arm 6 is moved through the second return spring 45 on the first Bowden wire 42 side. The first knocker unit 10 receives a force to rotate clockwise. In the first brake arm 6, when the first arm portion 8 is rotated counterclockwise and the first knocker portion 10 is rotated clockwise, the first brake restricting portion 18 of the first arm portion 8 Since the 1st relative rotation control means 33 which consists of the 1st level | step-difference part 30 of the 1st knocker part 10 does not engage, the 1st knocker part 10 rotates freely clockwise. Thus, even when the first knocker portion 10 receives a force in the clockwise direction from the second bracket 21 via the second return spring 45, the second return spring 45 is not compressed, and the bent first bowden is bent. The wire 42 is simply displaced to absorb the influence of the rotation of the second arm portion 9. Therefore, even if the second brake lever 49 is operated, the first brake lever 47 can maintain the non-operating position without play without being affected by the first Bowden wire 42.
[0033]
Further, with the operating force transmitted to the third Bowden wire 52, the second brake 5 is actuated and the rear wheel 4 is braked in the same manner as a conventional bicycle brake. Thus, the operation of the second brake lever 49 causes the front wheel 2 and the rear wheel 4 to be braked in conjunction with each other.
[0034]
When the second brake lever 49 is released, the brake operating force transmitted to the second knocker portion 11 and the first arm portion 8 via the second Bowden wire 38 is released, so that the compressed first return spring 41 is compressed. With this spring force, the second knocker portion 11 of the second brake arm 7 rotates counterclockwise in FIG. 2 and the first arm portion 8 rotates clockwise. At this time, since the second rotation restricting portion 19 and the second stepped portion 31 are separated from each other and the engagement of the second relative rotation restricting means 34 is released, the second arm portion 9 becomes free. As a result, the first and second brake shoes 14, 15 are opened to release the rim 37, so that the braking of the front wheel 2 is released. At the same time, the restoring force of the first return spring 41 causes the second Bowden wire 38 to return to the non-operating position, and the second brake lever 49 returns to the non-operating position by returning the second Bowden wire 38 to the non-operating position. Return. Further, when the second brake lever 49 is returned to the non-operating position, the braking of the rear wheel 4 by the second brake 5 is released in the same manner as in the prior art.
[0035]
In addition, when the braking force of the front wheel 2 is particularly enhanced while the front and rear wheels 2 and 4 are interlocked and braked by the interlocking braking system, the first brake lever 47 is also rotated while the second brake lever 49 is rotated. It may be operated manually. That is, according to such an operation, in the first brake 3, the operating force of the first brake lever 47 is applied to the first brake arm 6 and the second bracket 21 via the first Bowden wire 42 and to the second brake. Since the operating force of the lever 49 is simultaneously transmitted to the second brake arm 9 and the first bracket 20 via the second Bowden wire 38, these operating forces are added together to connect the first and second brake shoes 14, 15 to each other. The front rim 2 can be strongly braked by strongly pressing the rim 37. Of course, at the same time, in the second brake 5, the braking force corresponding to the operating force of the second brake lever 49 is exerted by the action of the interlocking braking system, and the rear wheel 4 can be braked. Accordingly, the braking force of the first brake 3 can be increased and controlled by the operating force of the first brake lever 47 while the braking force of the second brake 4 is controlled to be constant by the operating force of the second brake lever 49.
[0036]
In addition, each brake lever 47, 49 is held in a non-operating position without rattling by the urging force of the corresponding return spring 45, 41. Therefore, following the operation of one brake lever 47 or 49, Even when the brake lever 49 or 47 is operated, the other brake lever is operated while compressing the corresponding return spring 45 or 41 from a predetermined non-actuated position. it can.
[0037]
Thus, only the front wheel 2 can be braked by the first brake lever 47 of the single braking system, and at this time, the second brake lever 49 of the interlocking braking system is not affected. Further, both the front wheel 2 and the rear wheel 4 can be braked together by the second brake lever 49, and at this time, the first brake lever 47 is not affected. Therefore, depending on the running conditions of the bicycle, the single braking system is operated to brake only the front wheel 2, the interlocking braking system is operated to simultaneously brake the front and rear wheels 2 and 4, or both systems are operated simultaneously to The brakes of the front and rear wheels 2 and 4 can be adjusted by simultaneously braking the wheels 2 and 4 and increasing the braking force of the front wheels 2, thereby improving operability and braking feeling.
[0038]
In addition, even if a failure occurs in one of the single braking system and the interlocking braking system, the other braking system is not affected by the change in play amount, and the other braking system is securely connected. Can be operated.
[0039]
Further, a first return spring 45 is contracted between the first knocker portion 10 and the second arm portion 9 so that the second brake shoe 15 is opened with respect to the first brake shoe 14. The first brake lever 47 is urged to rotate to the non-actuated position, and the second return spring 41 is contracted between the second knocker portion 11 and the first arm portion 8. The first arm portion 8 is urged to rotate so as to open the first brake shoe 14 with respect to the second brake shoe 15, and the second brake lever 49 is urged to rotate to the inoperative position. Therefore, with a simple structure, the brake levers 47 and 49 and the brake shoes can be returned to the non-operating position, and rattling of the brake levers 47 and 49 can be prevented.
[0040]
In the above embodiment, the first brake 3 is provided on the front wheel 2 side. However, the first brake 3 may be provided on the rear wheel 4 side and the second brake 5 may be provided on the front wheel 2 side. . Further, an rim of each brake shoe 14 and 15 is provided between the first arm portion 8 and the second arm portion 9 via an expansion spring that opens both of them 8 and 9 around the fixed fulcrum 32 when not braking. It is also possible to avoid dragging with respect to 37.
[0041]
【The invention's effect】
As described above, according to the first feature of the present invention, a mode in which one wheel is braked independently by operation of the first brake lever, a mode in which front and rear wheels are simultaneously braked by operation of the second brake lever, The front and rear wheels are braked simultaneously by simultaneous operation of the first and second brake levers, and the mode of strengthening the braking force of one wheel is appropriately selected according to the driving conditions to adjust the braking balance of the front and rear wheels. In addition, the braking feeling can be improved. Also, even if a failure occurs in one of the single braking system and the interlocking braking system, the other braking system is not affected by the change in play amount, and the other braking system is securely connected. Can be operated.
[0042]
According to the second feature of the present invention, the second arm portion is urged to rotate between the first knocker portion and the second arm portion in a direction to retract the second brake shoe from the rim, and the first brake A first return spring is interposed to urge the lever to the non-operating position, and the first arm portion is rotated between the second knocker portion and the first arm portion in a direction to retract the first brake shoe from the rim. Since the second return spring is provided to move and bias the second brake lever to the non-operating position, each brake lever and brake shoe can be returned to the non-operating position with a simple structure. In particular, rattling of each brake lever can be prevented.
[Brief description of the drawings]
FIG. 1 is a side view of a bicycle equipped with a brake according to the present invention.
FIG. 2 is a front view showing a single braking system and an interlocking braking system in the brake device.
FIG. 3 is an exploded perspective view of a main part of the brake device.
4 is an enlarged view around a second brake lever of FIG. 2;
[Explanation of symbols]
1. Bicycle
2. Front wheel
3 .... First brake
4. Rear wheel
5 ... Second brake
6 ··· First brake arm
7 ··· Second brake arm
8 ... 1st arm part
9 ··· Second arm
10 ... 1st knocker part
11 ... 2nd knocker part
14 ... 1st brake shoe
15 ... Second brake shoe
33 ... First relative rotation restricting means
34 ... Second relative rotation restricting means
37 ... Rim
38 ... 2nd Bowden wire
39 ... Outer wire of second Bowden wire
40 ... Inner wire of the second Bowden wire
41 ... 1st return spring
42 ... 1st Bowden wire
43 ... Outer wire of the first Bowden wire
44 ... Inner wire of the first Bowden wire
45 ... Second return spring
47 ... 1st brake lever
49 ... Second brake lever
52 ... 3rd Bowden wire
53 ... Inner wire of the third Bowden wire
54 ... Outer wire of third Bowden wire

Claims (2)

A first brake (3) that brakes one of the front wheel (2) and the rear wheel (4), a second brake (5) that brakes the other of the front wheel (2) and the rear wheel (4), and the first brake The first brake lever (47) connected to the first brake (3) via the first Bowden wire (42) to operate the (3) alone, and the first and second brakes (3, 5). A second brake lever (49) connected to the first and second brakes (3, 5) via second and third Bowden wires (38, 52), respectively,
The first brake (3) is braked to the first arm part (8) and the first knocker part (10), which are pivotally supported by the bicycle (1) relative to each other, and to the first knocker part (10). When an operating force is applied, a first relative rotation that prevents relative rotation of the first arm portion (8) and the first knocker portion (10) and transmits the brake operating force to the first arm portion (8). A first brake arm (6) comprising a movement restricting means (33) and a first rim (37) of one of the front wheel (2) and the rear wheel (4) attached to the first arm portion (8) The opposing first brake shoe (14), the second arm part (9), the second knocker part (11), and the second knocker part (11) pivotally supported relative to each other on the bicycle (1). When the brake operating force is applied to the second arm portion (9) and the second knocker A second brake arm (7) comprising second relative rotation restricting means (34) for preventing the relative rotation of the portion (11) and transmitting the brake operating force to the second arm portion (9); A second brake shoe (15) attached to the second arm portion (9) and facing the other side of the rim (37);
The inner wire (44) of the first Bowden wire (42) is connected to the first knocker part (10) and the outer wire (43) of the first Bowden wire (42) is connected to the second arm part (9). Then, the brake operation force applied to the first brake lever (47) is applied to the first arm portion (8) via the first knocker portion (10) and the first relative rotation restricting means (33). The first brake (3) is actuated by transmitting to the second arm portion (9) and clamping the first and second brake shoes (14, 15) to the rim (37). While
The inner wire (40) of the second Bowden wire (38) is connected to the second knocker portion (11) and the outer wire (39) of the second Bowden wire (38) is connected to the first arm portion (8). Then, a part of the brake operating force applied to the second brake lever (49) is transferred to the second arm part (11) via the second knocker part (11) and the second relative rotation restricting means (34). 9) and also to the first arm portion (8) to clamp the first and second brake shoes (14, 15) against the rim (37), thereby the first brake (3). At the same time, the other part of the brake operating force applied to the second brake lever (49) is transmitted to the second brake (5) via the third Bowden wire (52) to transmit the second brake. Activate (5) Characterized in that so as to bicycle brake devices. Between the first knocker part (10) and the second arm part (9), the second arm part (15) is arranged to open the second brake shoe (15) with respect to the first brake shoe (14). 9) and a first return spring (45) for rotating and urging the first brake lever (47) to the non-operating position,
Further, the first arm is configured to open the first brake shoe (14) with respect to the second brake shoe (15) between the second knocker portion (11) and the first arm portion (8). 2. A second return spring (41) for turning and urging the portion (8) and urging the second brake lever (49) to a non-operating position is provided. The brake device for bicycles as described.

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