JPH05229473A - Brake shoe for bicycle - Google Patents

Abstract

PURPOSE:To set a setting angle with ease as well as to allow each shoe to be commonly used for the right and left even it is special in shape by disposing each projected section in a place positioned at the center or roughly at the center of each braking surface in the wheel rotating direction in the plane view of each brake shoe main body. CONSTITUTION:Brake shoes 5a are furnished with two projected sections 13 and 13 which are lined up in parallel in the breadth direction of each brake shoe 5, and are disposed in a place positioned at the center C or roughly at the center of each braking surface 12 in the wheel rotating direction in the plane view of each brake shoe main body. This consequently enables the setting angle of each brake shoe 5 to each brake arm 1 to be easily set to a specified one, and also enables each brake shoe to be commonly used for the right and left of a wheel rim 6. In this case, each braking surface 12 is faced to the wheel rim 6 with a slant angle A kept, the application of the brake several times thereby causes each projected section 13 to be worn because of friction. The setting of the slant angle A however permits the whole of the braking surface 12 to be brought into contact with wheel rim 6 in the operation of the brake shoes 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle brake shoe having a brake shoe main body which comes into contact with a wheel rim.

[0002]

2. Description of the Related Art In the above-mentioned bicycle brake shoe,
Conventionally, as disclosed in Japanese Utility Model Publication No. 3-62238,
A protrusion is provided at one end of the braking surface, and when the brake shoe is attached to the brake arm, the protrusion contacts the wheel rim on the rear end side of the braking surface, and the height of the protrusion, Before the braking operation, the braking surface inclines against the rim surface at a predetermined angle, and during braking operation, the braking surface properly contacts the rim and easily adjusts to the mounting angle where contact failure or braking failure is unlikely to occur. Then there was something that could be installed.

[0003]

Conventionally, for example, the braking surface of the brake shoe body is formed by an arcuate surface along the rim, or a portion located above the mounting axis of the brake shoe body and a portion located below the mounting axis of the brake shoe body. If the shoe body has a special shape, such as different wall thicknesses, and you try to use the brake shoe on the right side, which was created to act on the left side of the wheel rim, because the brake shoe body is reversed in the front-back direction,
Since the protrusion for setting the mounting angle is located on the front end side of the braking surface and cannot be used for setting the mounting angle, it is necessary to separately create the left-side brake shoe and the right-side brake shoe separately. It was An object of the present invention is to provide a brake shoe that not only allows easy setting of a mounting angle when mounted on a brake arm, but is relatively easy to use for left and right even when the shoe body has a special shape.

[0004]

In order to achieve the object, a brake shoe for a bicycle according to the first aspect of the present invention protrudes higher than a braking surface that comes into contact with a wheel rim of a brake shoe body, and contacts the wheel rim. The mounting angle of the brake shoe main body with respect to the brake arm is set by, and a protrusion that is removed by friction with the wheel rim is provided, and the protrusion rotates the wheel on the braking surface in plan view of the brake shoe main body. It is arranged at a position located at or near the center in the direction along the direction. In order to achieve an object, a brake shoe for a bicycle according to the second aspect of the present invention has a braking surface that comes into contact with a wheel rim of a brake shoe body in a direction along a wheel rotation direction of the braking surface in a plan view of the brake shoe body. And becomes highest at a position located at the center or almost the center, and becomes lower from the position to both ends in the direction along the wheel rotation direction, and,
There is provided a braking surface portion which is a medium-high mountain-shaped surface that wears and changes to a flat surface due to friction with the wheel rim. The action and effect are as follows.

[0005]

When the brake shoes are arranged on either the left or right side of the wheel rim, it is necessary to reverse the direction of the brake shoes along the wheel rotation direction when the brake shoes are used for the left and right. Even with the special shape described at the beginning, in the first invention, the protrusion and the one end side of the braking surface, and in the second invention, the highest point of the braking surface portion and the braking surface. The protrusion of the first aspect of the invention is such that the brake shoe body is brought into a predetermined mounting angle with respect to the brake arm simply by abutting the brake shoe body on the wheel rim so that one end of the brake shoe abuts on the wheel rim. Section or the braking surface portion of the second aspect of the invention is in contact with the wheel rim at or near the central portion to set the mounting angle. Then, when the brake shoes are attached and the braking operation is performed,
In the first invention, the protrusion is frictionally removed with the wheel rim, and in the second invention, the braking surface is changed into a flat surface by the friction with the wheel rim, and the wheel rotation direction of the brake shoe body is changed. Braking can be performed over the entire length as desired.
According to the second aspect of the invention, compared to the protrusion of the first aspect of the invention, the braking surface portion is less likely to be worn and removed, and the braking surface portion is stably brought into contact with the wheel rim until the braking surface portion changes to a flat surface. Stable braking force is exhibited even when the brake shoes are installed in the middle of the process.

[0006]

According to either of the first and second aspects of the invention, the brake shoe body can be easily adjusted by setting it on the wheel rim, and the brake shoe can be adjusted to an appropriate mounting angle with respect to the brake arm. It has become possible to efficiently and easily obtain an assembled state in which the wheel properly acts on the wheel rim to perform good braking from the angle adjusting surface of the brake shoe. Moreover, even if the brake shoe main body has a special shape as described at the beginning, depending on the shape, it can be used for both left and right.
It was possible to obtain it cheaply and easily just by creating a kind. In addition, in the second aspect of the invention, at the initial stage of mounting the brake shoe, the mounting angle can be easily readjusted by using the braking surface portion, and the vehicle body can be relatively firmly braked.

[0007]

EXAMPLE As shown in FIG. 7, a pair of left and right brake arms 1 and 1 are attached to a vehicle body frame 2 so as to be swingably supported around an axis X or Y, and a suspension wire 3 is used. By interlocking with the brake wire 4 and pulling the brake wire 4, the brake wire 4
The left and right brake arms 1 and 1 swing toward the inside of the vehicle due to the lifting of the suspension wire 3 by the vehicle, and the brake shoes 5 attached to either of the brake arms 1 are wheel rims 6.
Of the brake wire so that frictional braking is applied by contacting the side surface of the brake wire, and by loosening the brake wire 4, the suspension wire 3 is loosened, and a return spring acting on the base end portion of the brake arm 1 ( Due to the returning action (not shown), the left and right brake arms 1 and 1 swing to the outside of the vehicle body, and either brake shoe 5 separates from the wheel rim 6 to release the brake. Therefore, a cantilever caliper brake for a bicycle is configured. As shown in FIGS. 2 and 5, the brake shoe 5 includes a rubber brake shoe body 5a and a metal mounting shaft 5b, and penetrates the brake arm 1 and washers 7, 8, 9 as shown in FIG. Then, the mounting shaft 5b is attached to the brake arm 1 by mounting the mounting shaft 5b to the brake arm 1 by mounting the mounting shaft 5b to the brake arm 1 by tightening with the tightening screw 10. It is formed by an arcuate surface along the rim 6, and the drainage groove 14
The braking surface 12 is provided to contact the wheel rim 6 for braking. Washer 8
By the action of the spherical shape of the contact surface with respect to No. 7 and the contact surface of the washer 9 with respect to the brake arm 1, the mounting angle of the mounting tool 11 with respect to the brake arm 1 can be adjusted, and the mounting angle can be adjusted. Thus, the mounting angle of the brake shoe 5 with respect to the brake arm 1 is adjusted.

FIG. 2 shows a brake shoe 5 of the first aspect of the present invention, in which the brake shoe 5 is formed simultaneously with the brake shoe main body 5a made of nitrile butadiene rubber so as to project on the braking surface 12 for braking. The brake shoe body 5 is provided with two projecting portions 13, 13 which are formed so as to project higher than the surface 12 and are arranged in parallel in the width direction of the brake shoe body 5. Each of the protrusions 13 and 13 is formed in a small shape that is easily worn away, and is located at the center C or substantially the center of the braking surface 12 in the direction along the wheel rotation direction in a plan view of the brake shoe body. When mounting the brake shoe 5 to the brake arm 1, the mounting angle of the brake shoe 5 to the brake arm 1 can be easily adjusted and set to the predetermined angle shown in FIG. It is designed to be possible while using 5 for both the left and right sides of the wheel rim 6. That is, regardless of whether the brake shoe 5 is applied to the left or right side of the wheel rim 6, as shown in FIG. 1, the mounting shaft 5b is placed in a state in which the front end side of the braking surface 12 and the protrusion 13 are in contact with the wheel rim 6. The length of insertion of the fitting 11 into the fitting 11 is adjusted and set, and the mounting angle of the fitting 11 with respect to the brake arm 1 is adjusted and set. Then, before the braking operation, the front end side of the braking surface 12 and the protrusion 13 contact the wheel rim 6,
The braking surface 12 faces the wheel rim 6 with an inclination angle A. When the brake is operated several times after the shoe is attached, the protrusion 13 is removed due to friction with the wheel rim 6. During braking after the protrusion disappears, a moving operation force acts on the brake shoe 5 due to the friction between the brake shoe body 5a and the wheel rim 6 and the turning force of the wheel rim 6 in the traveling direction F, and the brake arm 1 Despite the movement of the brake shoe 5 due to the mounting flexibility, etc., due to the inclination angle A, the operating state of the brake shoe 5 is appropriate such that the entire braking surface 12 contacts the wheel rim 6. Become.

FIG. 5 shows a brake shoe 5 of the second invention. In this brake shoe 5, the brake shoe body 5a is made of nitrile butadiene rubber, and the braking surface 12 is formed.
By providing the chevron surface portion over all of them, when the brake shoe 5 is attached to the brake arm 1, the attachment angle of the brake shoe 5 to the brake arm 1 can be easily adjusted and set to the predetermined angle shown in FIG. The brake shoes 5 are designed so that they can be used for both the left and right sides of the wheel rim 6 and are possible. That is, as clearly shown in FIG. 4, the mountain-shaped braking surface 12 is highest at the center C in the direction along the wheel rotation direction of the braking surface 12 in the plan view of the brake shoe body 5a, or at a position located substantially at the center. , And the braking surface 12 from that point
It is formed by a medium-high mountain-shaped surface which becomes lower toward both ends of the wheel rim 6, and when the brake shoe 5 is applied to either the left or right side of the wheel rim 6, as shown in FIG. The insertion length of the mounting shaft 5b into the mounting tool 11 is adjusted and set, and the mounting angle of the mounting tool 11 to the brake arm 1 is adjusted so that the highest point and the front end side contact the wheel rim 6. Set. Then, before the braking operation, the straight line L connecting the front end and the rear end of the braking surface 12 with respect to the wheel rim 6 is tilted with respect to the wheel rim 6 in order to contact the highest point of the braking surface 12 and the wheel rim 6 on the front end side. It is equipped with. The middle-high inclination angle of the braking surface 12 is set such that the relationship between the inclination angle B and the inclination angle A of the brake shoe 5 in FIG.
When the brake shoe 5 is attached and a braking operation is performed, a movement operation force acts on the brake shoe 5 due to the rotation of the wheel rim 6 in the traveling direction F and the friction between the wheel rim 6 and the brake shoe body 5a, and the brake arm. Due to the movement of the brake shoe 5 for mounting flexibility of 1 and the mountain shape of the braking surface 12, as the contact time between the brake shoe body 5a and the wheel rim 6 increases, the braking surface 12 is Straight line L
Wears and changes to a flat surface corresponding to the above, and finally, the brake shoe main body 5a brakes on the braking surface over the entire length in the front-rear direction.

[Other Embodiments] FIG. 3 shows another structure of the protruding portion 13, in which the base portion of the protruding portion 13 is formed from the tip end portion so that the protruding portion 13 can be extremely easily removed by contact with the wheel rim 6. It is thinly formed. FIG. 6 shows another embodiment of the brake shoe 5, in which only a part 12a of the braking surface 12 is provided with a middle and high angled surface portion. That is, the wheel rim 6 of the braking surface portion 12a
The attachment angle of the brake shoe body 5a with respect to the brake arm 1 is set by the contact with the. And from the surface of the size of the chevron surface portion 12a,
The braking surface 12 is configured to wear and change into a flat surface more quickly than when the braking surface 12 is formed as a chevron surface as a whole.

8 and 9 show a brake shoe 5 according to another embodiment, in which a protrusion 13 for setting a mounting angle is formed on a ridge extending in the lateral width direction of the brake shoe body 5a. Then, a pair of protrusions 13, 13 is formed in the braking surface 12 at the time of molding the brake shoe body 5a, and the recessed hole 15 is formed.
When the brake shoes 5 are arranged in a dispersed manner on both lateral sides of the wheel, and the brake shoes 5 are arranged on one of the left and right sides of the wheel and mounted, and when mounted on the other of the left and right sides of the wheel, the protrusions 13, 1
All of the three are used.

10 to 15 show a brake shoe 5 according to another embodiment, in which a protrusion 13 or 13a, 13b for setting a mounting angle is formed into a truncated cone shape. And in the thing shown in FIG.10, FIG.11, FIG.14, FIG.15, a pair of protrusion parts 13a and 13b are the drainage groove | channels located in the center C in the wheel rotation direction of the brake shoe main body 5a, or the approximate center. 14 on both sides of the brake shoe body 5a, or on both sides of the drainage groove 14 located at or about the center C of the brake shoe body 5a in the wheel rotation direction, and on both sides of the recessed hole 15. I am doing it. Then, one of the protrusions 13a or 13b and the braking surface end 12a or 12b located on the side opposite to the center C with respect to the protrusion 13a or 13b are brought into contact with the wheel rim 6. When the braking surface 12 is inclined with respect to the wheel rim 6 and the other protrusion 13b or 13
a and the braking surface end 12b or 1 on the side opposite to the center C with respect to the protrusion 13b or 13a
Braking surface 1 when 2a and wheel rim 6 are in contact with each other
The protrusion heights of the protrusions 13a and 13b are formed so that the inclination angles of the two with respect to the wheel rim 6 are equal or substantially equal. That is, when the brake shoe 5 is arranged and used on one of the left and right sides of the wheel, one protrusion 13a or 13b is used, and when the brake shoe 5 is arranged and used on the other side of the wheel left and right. , The other protrusion 13b or 13a is used. 12 and 13, the pair of protrusions 13 and 13 are arranged dispersedly on both sides of the recessed hole 15, and the brake shoe 5 is disposed on one of the left and right sides of the wheel. Both of the protrusions 13 and 13 are configured to be used both when they are arranged and attached and when they are attached to the other on the left and right sides of the wheel.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a plan view showing a mounting procedure of a first invention brake shoe.

FIG. 2 is a perspective view of the entire brake shoe.

FIG. 3 is a plan view of another embodiment protrusion.

FIG. 4 is a plan view showing a mounting procedure of the second invention brake shoe.

FIG. 5 is a perspective view of another embodiment brake shoe.

FIG. 6 is a perspective view of another embodiment brake shoe.

FIG. 7 is a front view of a caliper brake.

FIG. 8 is a perspective view of another execution brake shoe.

FIG. 9 is a plan view of another execution brake shoe.

FIG. 10 is a perspective view of another embodiment of a brake shoe.

FIG. 11 is a plan view of another execution brake shoe.

FIG. 12 is a perspective view of another execution brake shoe.

FIG. 13 is a plan view of another execution brake shoe.

FIG. 14 is a perspective view of another embodiment brake shoe.

FIG. 15 is a plan view of another execution brake shoe.

[Explanation of symbols]

 1 Brake Arm 5a Brake Shoe Body 6 Wheel Rim 12 Braking Surface 13, 13a, 13b Projection C Center

Claims (2)

[Claims] 1. The brake shoe body (5a) projects higher than a braking surface (12) which comes into contact with a wheel rim (6),
The protrusion (13) that sets the attachment angle of the brake shoe body (5a) to the brake arm (1) by contact with the wheel rim (6) and is removed by friction with the wheel rim (6). ), (13a), (13b), the protrusions (13), (13a), (13b) in the brake shoe body plan view, the braking surface (12)
A brake shoe for a bicycle, which is arranged at a center (C) in a direction along the wheel rotation direction of or in a position located substantially at the center. 2. The braking surface (12) of the brake shoe body (5a) that comes into contact with the wheel rim (6) is in a direction along the wheel rotation direction of the braking surface (12) in plan view of the brake shoe body. It becomes the highest at the center (C) or a position located almost at the center, and becomes lower from the position to both ends in the direction along the wheel rotation direction, and becomes flat due to friction with the wheel rim (6). Brake shoes for bicycles that have a medium- and high-angled chamfer that wears and changes.