JPH0757632B2 - Brake device for bicycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of Industrial Application The present invention is directed to a pair of brake rods that interlock with a brake operation of a pair of brake levers disposed at both ends of a handle along a handle post. The present invention relates to a bicycle brake device in which a front wheel brake is connected to one brake rod and a rear wheel brake is connected to the other brake rod via a transmission mechanism.

(2) Related Art Conventionally, in such a bicycle brake device, the brake lever at the right end of the handle is connected to the front wheel brake via one brake rod, and the brake lever at the left end of the handle connects the other brake rod and the transmission mechanism. It is connected to the rear wheel brake via.

(3) Problems to be Solved by the Invention However, when a sudden braking operation is performed while traveling, the operating force of the brake lever on the dominant arm side, for example, the right side, tends to be stronger, and the braking force of the front wheel brake is large. You may get a handle or fall down. In addition, it may be necessary to operate the brake with one hand, but in this case, it is dangerous to apply only the front wheel brake, which may cause a fall, and it is sufficient to apply only the rear wheel brake. I can't get power.

Therefore, in order to solve such a problem, for example
As disclosed in Japanese Laid-Open Patent Publication No. 725, no matter whether the left or right brake lever of the handle is operated, an arm rod to which a turning torque is applied from the lever to the base end is pivotally supported on the upper end of the handle post. , By engaging the upper end of the brake rod connected to the front wheel brake and the upper end of the brake rod connected to the rear wheel brake to the tip of the arm rod so that the former is biased more forward than the latter, It has already been proposed that the front and rear wheel brakes can be operated no matter which brake lever is operated, and that the braking force of the rear end brake can always be made stronger.

However, in the proposal, a turning torque is applied from the brake lever to the arm rod in the vicinity of the turning center thereof, and the upper ends of the respective brake rods are engaged with each other on the tip side separated from the turning center. Therefore, the above-mentioned brake rods (therefore, front and rear wheel brakes) cannot be operated lightly due to the lever ratio, and a large bending load is applied to the base of the arm rod, so the durability of the arm rod itself There is also a problem.

The present invention has been proposed in view of the above, and an object thereof is to provide a bicycle brake device that can solve all the above problems of the conventional one.

B. Structure of the Invention (1) Means for Solving the Problems According to the present invention in order to achieve the above object, one brake rod is connected to one brake lever and a first brake rod that is linked and connected to the other brake lever. , A third brake rod that is divided into a second brake rod that is connected to the front wheel brake, and the other brake rod is linked and linked to the other brake lever, and a fourth brake rod that is connected to the transmission mechanism. The front end of the rotating plate is rotatably supported by a support frame that is divided and protrudes from the front of the handle post. The front end of the rotating plate and one of the left and right sides are attached to the rear end of the rotating plate. Is formed with a notch whose inner surface closely faces each other, the first and third brake rods are respectively engaged laterally of the handle post, and the rotary plate is provided with the rotary plate on the front side of the engaging parts. Second and second And the fourth brake rod are respectively engaged by displacing the second brake rod to the front side with respect to the fourth brake rod.

(2) Action When one or both of the two brake levers are brake-operated, the rotating plate is rotated upward and both brakes are operated. Moreover, since the second brake rod is engaged with the rotating plate closer to the center of rotation than the fourth brake rod,
The movement amount of the fourth brake rod is larger than the movement amount of the second brake rod, and the rear wheel brake has a stronger braking force than the front wheel brake.

Further, since the engaging positions of the second and fourth brake rods with respect to the rotating plate are on the front side of the engaging positions of the first and third brake rods, the first and second brake rod sides are in relation to each other due to the lever ratio. The third and fourth brake rods (and therefore the front and rear wheel brakes) can be operated lightly with a relatively small operating force from.

Further, if the notch is specially provided, the rear end of the rotating plate can be extended rearward as much as possible without being obstructed by the handle post, so that the amount of protrusion of the rotating plate to the front side of the handle post is particularly long. Even if it does not, the distance between each engaging position of the first and third brake rods at the rear end of the rotating plate and the rotational center position at the front end of the rotating plate, that is, the first and third brake rods rotate. It becomes possible to set the effective length of the arm of the moment exerted on the moving plate as long as possible.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIGS. 1 and 2, a handle post 2 is rotated on a head pipe 1 at a front portion of a body frame F of a bicycle. The handle post 3 is rotatably supported, and the first end is attached to the right end of the handle 3 attached to the upper end of the handle post 2.
The brake lever L1 is arranged so as to be able to move closer to and away from the grip portion 4, and the second brake lever L2 is arranged at the left end of the handle 3 so as to be able to move closer to and away from the grip portion 5. .

The fork 6 integrated with the handle post 2 has a front wheel brake for obtaining a braking force by friction with the rim 7 of the front wheel Wf.
Bf is supported, and a rear wheel brake Br is provided at the rear portion of the body frame F for tightening a rotating plate 8 integrated with the rear wheel Wr to obtain a braking force.

Referring to FIGS. 3 and 4 together, the first and the second
The brake levers L1 and L2 are provided on the steering wheel 3 one pair at a time.
A pair of rotating shafts 11 and 12 rotatably supported by a pair of brackets 9 and 10 are integrally provided at the outer ends of the rotating shafts 11 and 12, and a lever 13 is provided at the inner ends of the rotating shafts 11 and 12 facing each other. , 14 are installed.
Moreover, the levers 13 and 14 are bent and formed so as to be parallel to each other on one side of the handle post 2. One end of the torsion springs 15 and 16 surrounding the rotary shafts 11 and 12 has levers 13 and 1, respectively.
4 and the other ends of the torsion springs 15 and 16 are engaged with the handle 3, respectively. As a result, the levers 13 and 14 and the rotation shafts 11 and 12 are rotationally biased in the direction in which the first and second brake levers L1 and L2 are separated from the grip portions 4 and 5.

An upper end of a first brake rod 17 extending vertically along the handle post 2 is connected to one lever 13 attached to a rotary shaft 11 that is integral with the first brake lever L1. The upper end of a third brake rod 19 extending vertically in parallel with the first brake rod 17 is connected to the other lever 14 attached to the rotary shaft 12 that is integral with the second brake lever L2.

The front wheel brake Bf is configured such that brake rubbers 22 that can be in close contact with the rim 7 are attached to lower ends of both sides of an operating member 21 formed in a substantially U shape so as to straddle the front wheel Wf. Moreover, a guide rod 23 is provided at the lower end of the operating member 21 so as to project downward, and the guide rod 23 movably penetrates the support member 24 attached to the fork 6. As a result, the operating member 21 is movably supported in the direction in which the brake rubber 22 moves toward and away from the rim 7, and is supported by the fork 6.

The lower end of a second brake rod 18 extending vertically along the handle post 2 is connected to the upper end of the actuating member 21 of the front wheel brake Bf, and the front wheel brake Bf moves in accordance with the vertical movement of the second brake rod 18. Operate.

The rear wheel brake Br is a band brake, and is configured to tighten the outer periphery of the rotary plate 8 integrally provided on the axle 27 of the rear wheel Wr within the cover 26 attached to the vehicle body frame F with the band 28. . That is, the band 28 is wound around the outer periphery of the rotary plate 8 with one end fixed to the inner surface of the cover 26, and the other end of the band 28 is connected to a substantially V-shaped actuating lever 29 rotatable in the cover 26. It The actuating lever 29 is accommodated in the cover 26 by pivotally supporting the middle bent portion of the actuating lever 29 by the pin 30 and the other end of the band 28 is connected to one end of the actuating lever 29. The other end of the operating lever 29 is projected downward from the lower part of the cover 26 so as to apply a braking force from the outside of the cover 26.

A transmission mechanism is provided on the other end of the operating lever 29 protruding from the cover 26.
31 are connected.

This transmission mechanism 31 includes a horizontal pin at the front of the body frame F.
A first transmission lever 33 rotatably supported by 32, a second transmission lever 35 rotatably supported by a horizontal pin 34 at the center of the vehicle body frame F, and first and second transmission levers 33. , 3
The first transmission rod 36 connecting the five and the second transmission lever 35
And a second transmission rod 37 connecting between the rear wheel brakes Br.

The first transmission lever 33 is formed in a substantially V shape, and an intermediate bent portion thereof is pivotally supported by the vehicle body frame F by the pin 32.
The lower end of the fourth brake rod 20 extending vertically along the handle post 2 is connected to one end of the first transmission lever 33.

The second transmission lever 35 is formed in a substantially Y shape, and the other end of the first transmission rod 36 is connected to the second transmission lever 35. Also, the second transmission lever 35 and the operating lever 29 of the rear wheel brake Br.
Means that the distance between them can be adjusted and the second transmission rod 37
Are connected by.

In the transmission mechanism 31, the second transmission rod 37 moves in the direction indicated by the arrow in response to the upward movement of the fourth brake rod 20, and the rear wheel brake Br is braked accordingly.

A torsion spring 38 is interposed between the second transmission lever 35 and the vehicle body frame F, and the second transmission lever 35, that is, the transmission mechanism 31, is urged in a direction to release the rear wheel brake Br.

In FIGS. 5 and 6, the handle post 2 includes:
A rectangular support frame 39 is mounted by a mounting member 40 so as to be located on the front side thereof. A rotary plate 41 is rotatably supported on the support frame 40.

The rotating plate 41 has its front end pivotally supported by the front part of the support frame 39, that is, the front end of the rotating plate 41 has a pair of fitting arm parts fitted in the support frame 39. 42 are provided so as to project, and the fitting arm portions 42 are rotatably supported by a horizontal support shaft 43.

A notch 41a through which the handle post 2 extends vertically is formed on the left and right sides of the rear end of the rotating plate 41, and the rear end of the rotating plate 41 extends to a side position of the handle post 2. The inner surface of the cutout portion 41a closely faces the front surface and the left side surface of the handle post 2. The first and third brake rods 17 and 19 are engaged with the rear end of the rotating plate 41 at the side of the handle post 2 at a predetermined distance 1 from the center of rotation of the rotating plate 41. It That is, engaging holes 44 and 45 are formed in parallel at the other end of the rotating plate 41 that is separated from the center of rotation by a distance of 1, and the first and third brake rods 17 and 1 are formed.
9 is inserted into the engaging holes 44, 45 from above. Moreover, nuts 46 and 47 that engage with the lower surface of the rotating plate 41 are screwed onto the lower ends of the first and third brake rods 17 and 19.

An engagement hole 48 is formed at a position at a distance l2 from the rotation center of the rotation plate 41, and an engagement hole 49 is provided at a position l3 which is larger than the distance l2 between the rotation center and the rotation center. Is drilled. The second brake rod 18 is inserted from below into one of the engagement holes 48, and a nut 50 that engages with the upper surface of the rotating plate 41 is screwed onto the upper end of the second brake rod 18. The other engaging hole 49 has a fourth
The brake rod 20 is inserted from below, and a nut 51 that engages with the upper surface of the rotating plate 41 is screwed onto the upper end of the fourth brake rod 20. Since the distances l2 and l3 are both set to be smaller than the distance 1, the second and the second brake rods 17 and 19 can be operated with a relatively small operating force in relation to the lever ratio. 4 The brake rods 18 and 20 can be operated lightly.

Between the second brake rod 18 and the support frame 39, the second brake rod 18 faces downward, that is, the front wheel brake Bf.
A spring 52 for urging the brake is released in the direction of releasing the brake.

Next, the operation of this embodiment will be described. When either or both of the first and second brake levers L1 and L2 are brake-operated in order to obtain a braking force while traveling on a bicycle, the first and third brake levers are operated. Either one or both of the brake rods 17 and 19 moves upward. As a result, the rotating plate 41 rotates upward and the second and fourth brake rods are rotated.
18, 20 move upward, and the front wheel and rear wheel brakes Bf, Br are activated.

At this time, the fourth brake rod 20 is the second brake rod.
Since it is engaged with the rotary plate 41 at a position farther from the center of rotation than 18, the amount of upward movement of the rotary plate 41 is equal to that of the second brake rod.
Greater than 18. Therefore, the rear wheel brake Br starts to operate before the front wheel brake Bf, and the braking force becomes stronger. Therefore, sufficient braking force can be obtained on the rear wheel Wr side,
It is possible to prevent an excessive braking force from acting on the front wheels Wf and reduce the risk of falling.

Further, since the first and third brake rods 17 and 19 are engaged with the rotating plate 41 at a position farther from the rotation center than the second and fourth brake rods 18 and 20, a relatively small operating force is required. Thus, the rotating plate 41 can be rotated to obtain a relatively large braking force.

C. Effects of the Invention As described above, according to the present invention, one brake rod is divided into a first brake rod that is interlocked and connected to one brake lever and a second brake rod that is connected to the front wheel brake. The other brake rod is divided into a third brake rod that is interlocked and connected to the other brake lever and a fourth brake rod that is connected to the transmission mechanism, and the support frame protruding from the front of the handle post is provided. The front end of the rotary plate is rotatably supported in the vertical direction, and the rear end of the rotary plate is formed with a notch portion whose inner surface closely faces the front surface and one left and right side surfaces of the handle post. The first and third brake rods are respectively engaged on the sides of the handle post, and the second and fourth brake rods are attached to the rotary plate on the front side of the engaging portions, and the second brake rods are attached to the rotary plate. Fourth Since they are biased toward the front side of the rake rod and engaged, when both or both of the pair of brake levers are brake-operated, both brakes are operated and the braking force of the rear wheel brake is greater than that of the front wheel brake. Can be strengthened to prevent falls.

Further, since the engagement positions of the brake side second and fourth brake rods with respect to the rotating plate are on the front side of the engagement positions of the brake lever side first and third brake rods, the first and The second and fourth brake rods, and by extension the front, from the third brake rod side with a comparatively small operating force.
The rear wheel brakes can be actuated lightly and, at that time, the rotating plate does not receive a particularly large bending load on itself, so that the durability is enhanced.

Further, since the rear end of the rotating plate can be extended rearward as much as possible without being obstructed by the handle post by the cutout portion specially provided on the rotating plate, the amount of protrusion of the rotating plate to the front side of the handle post is special. Even if it is not made too long,
And the distance between each engagement position of the third brake rod and the rotation center position at the front end of the rotation plate, that is, the effective length of the arm of the moment that the first and third brake rods exert on the rotation plate as much as possible. Therefore, the second and fourth brake rods can be operated more lightly by the first and third brake rods. Moreover, since the rotary plate can be brought as close as possible to the space around the handle post by forming the cutout portion, not only the rotary plate can be made inconspicuous as much as possible, but also other rotary plate members can be provided. The collision of the object can be avoided as much as possible by the handle post.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a perspective view of a bicycle, Fig. 2 is an enlarged sectional view taken along line II-II of Fig. 1,
FIG. 3 is a view taken in the direction of arrow III in FIG. 2, FIG. 4 is an exploded perspective view of a portion IV in FIG. 3, FIG. 5 is an enlarged sectional view taken along line VV of FIG.
The figure is a sectional view taken along the line VI-VI of FIG. 2 ... Handle post, 3 ... Handle, 17 ... First brake rod, 18 ... Second brake rod, 19 ... Third brake rod, 20 ... Fourth brake rod, 31 ... Transmission mechanism, 39 ... Support frame, 41 ... Rotation Moving plate, 41a ... Notch, Bf ... Front wheel brake, B
r ... Rear wheel brake, L1, L2 ... Brake lever

Claims (1)

[Claims] 1. A pair of brake rods (17, 18; 19, 20) interlocking with a brake operation of a pair of brake levers (L1, L2) arranged at both ends of a handle (3) are attached to a handle post (2). The front wheel brake (Bf) is connected to one brake rod (17, 18) and the other brake rod (19, 20) is connected to the rear wheel via the transmission mechanism (31). In a bicycle brake device to which a brake (Br) is connected, one brake rod (17,1
8) is divided into a first brake rod (17) linked to and linked to one brake lever (L1) and a second brake rod (18) linked to a front wheel brake (Bf), and the other brake The rods (19, 20) are linked to the other brake lever (L2) and connected to the third brake rod (19).
And a fourth brake rod (20) connected to the transmission mechanism (31) and a front end portion of the rotating plate (41) on a support frame (39) projecting on the front portion of the handle post (2). Is rotatably supported up and down, and a notch (41a) having an inner surface closely facing the front surface and one side surface of the handle post (2) is formed at a rear end portion of the rotating plate (41). At the same time, the first and third brake rods (17, 19) are respectively engaged laterally of the handle post (2), and the rotary plate (41) is provided with the second brake rod before the engaging portions. And a fourth brake rod (18, 20), wherein the second brake rod (18) is biased to the front side of the fourth brake rod (20) and engaged, respectively.