JPH0141668Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a brake shoe mounting structure for bicycle brakes, and in particular, while accurately maintaining the contact angle of the brake shoe with respect to the longitudinal direction of the rim,
This relates to a structure for bolting a brake shoe to a brake arm.

[Conventional technology]

To attach a brake shoe to the brake arm of a caliper brake, insert the mounting bolt that protrudes from the back of the shoe holder that holds the brake shoe into the mounting hole of the brake arm, and tighten the protruding end of this mounting bolt with a nut. It is fixed by this. Here, if the brake shoe and the rim of the wheel to be braked are not brought into contact without a gap, the braking efficiency will be reduced. In other words, the rim has a concentric ring shape along the wheel, and is squeezed from both sides by a pair of brake shoes to perform braking.
The side shape of the rim is annular, so in order to have the brake shoe follow the longitudinal direction of the rim side, the brake shoe must be installed in an inclined position along the longitudinal direction of the rim side. Must be installed on the brake arm. Normally, this mounting position is such that the front wheel is set with the brake shoe tilted upward toward the front, and the rear wheel is set with the brake shoe tilted upward toward the rear, but due to differences in the shape of the bicycle frame, wheel diameter, etc. The angle of inclination varies depending on the vehicle model, and cannot be done uniformly. Therefore, in order to install the brake shoe at the optimum angle along the longitudinal direction of the rim side, the brake shoe must be manually installed so that the brake shoe has the same inclination position in the longitudinal direction of each rim side. The mounting angle of the shoe in the left-right direction (front-back direction in the direction of bicycle travel) must be adjusted. For example, Japanese Utility Model Publication No. 55-23008 has been disclosed in which the brake shoe is rotatable vertically and horizontally with respect to the brake arm so that the brake shoe runs along the rim without any gaps. However, in this brake shoe mounting structure, the approximately square-shaped presser piece provided on the mounting bolt is fitted into the fitting recess formed on the rear surface of the brake shoe in a restrained state without any gaps, and the mounting bolt of the shoe holder protrudes. Since it is formed to have a large diameter so that it will not fall out of the hole, when the mounting bolt tilts or rotates, the brake shoe will also move together. Therefore, when tightening the mounting bolt to the brake arm, even if the mounting bolt slightly rotates due to the tightening torque through the nut, an amplified rotational force is applied to the brake shoe, causing the left and right rotation. The ends (front and rear ends in the bicycle's direction of travel) tilt significantly. Therefore, if a structure is adopted in which the holding piece of the mounting bolt can be tilted or rotated within the fitting recess of the brake shoe, the brake shoe will not rotate due to the tightening torque, but even in this case, the mounting As the bolt is gradually tightened, the holding piece of the mounting bolt squeezes the shoe holder that holds the brake shoe, so before tightening is complete, the rotational force of the mounting bolt is transmitted to the shoe holder, causing the brake shoe to rotate together with the shoe holder. There is a possibility that As a result, no matter how accurately the angle of the brake shoe is adjusted before tightening the mounting bolts, the angle must be readjusted before tightening, making it very time-consuming to attach the brake shoe to the brake arm. It's becoming work.

[Problem that the invention attempts to solve]

This idea was devised as a result of intensive research in view of the above circumstances, and when tightening the mounting bolts, tighten them in a restrained state without rotating them to prevent misalignment between the left and right ends of the brake shoe. The main challenge is to prevent this from occurring.

[Means to solve the problem]

In order to solve the above problem, this idea was developed by inserting the mounting bolt that protrudes from the back side of the shoe holder that holds the brake shoe into the mounting hole of the brake arm, and attaching the brake arm so that the brake shoe faces along the side of the rim. (a) The shape of the fitting recess on the rear side of the brake shoe and the shape of the holding piece of the mounting bolt that is fitted therein are determined by the brake shoe. are formed into a pair of non-restricted shapes that are rotatable in the circumferential direction (direction of shaft rotation) relative to the mounting bolt at least within a certain range; (b) insertion of the mounting bolt into the mounting hole of the brake arm; A measure was taken to provide an abutment surface that abuts the left and right side wall surfaces of the mounting hole and suppresses rotation of the mounting bolt.

[Effect]

Since the abutting surfaces of the mounting bolts are restrained by coming into surface contact with the left-right side wall surfaces of the mounting holes of the brake arm, the mounting bolts do not rotate when inserted into the mounting holes. In addition, the fitting recess of the brake shoe and the holding piece of the mounting bolt are rotatable at least within a certain range, in other words, within a range that allows the angle of the mounting position of the brake shoe to be adjusted along the longitudinal direction of the rim side surface. Therefore, with the mounting bolt fixed in the mounting hole as described above, if you adjust the brake shoe to the optimal angle with respect to the longitudinal direction of the rim side surface and then tighten the mounting bolt, the torque applied to the mounting bolt by the tightening force will be Since it is absorbed by the left and right peripheral walls of the mounting hole, the mounting bolt can remain stationary, and there is no risk that the brake shoe will tilt. Therefore, when the mounting bolts are tightened, the brake shoe does not shift its position and is disposed at the same angle along the longitudinal direction of the rim side surface, so that the optimum adjustment angle before mounting can be maintained.

【Example】

A preferred embodiment in which the brake shoe mounting structure of this invention is applied to a side-pull caliper brake will be described below with reference to the drawings. Side-pull caliper brake 1 in Figure 1
is connected by a center bolt 11, has an outer wire connection part 12 for the brake wire on one side, has an inner wire fixed on the other side 13, and has a spring tensioned on the back side so that the lower end side is biased to expand in the direction of separation from the rim. It has brake arms C and Y of the configuration. A vertically elongated mounting hole 8 is formed through the lower end side of each of the brake arms C, Y at opposing positions. In this embodiment, the mounting bolt 4 inserted into the mounting hole 8 includes a plate-shaped holding piece 5, a shaft main body 4A projecting outward from the center on one side thereof, and a base side of the shaft main body 4A. and a restraining table portion 6 formed in a raised manner. Here, the restraint table part 6 is formed integrally with the shaft main body 4A, and in the case of the illustrated example, it has an elliptical cylinder shape, such as having both sides of a cylinder cut vertically in parallel, and both sides of this flat shape are The abutting surfaces 6A, 6A are formed. Next, the brake shoe 2 supported by the mounting bolt 4 has a fitting recess 2A in the center of the back surface into which the pressing piece 5 of the mounting bolt 4 is fitted. The shapes of the fitting recess 2A and the holding piece 5 of the mounting bolt 4 are formed into a pair of non-restricted shapes that can be rotated at least within a certain range in the circumferential direction,
In the case of this embodiment, the fitting recess 2A consists of a through groove having a square shape from the front, and the holding piece 5 has an elliptical shape from the front. Therefore, as shown in FIG. 3, the holding piece 5 and the fitting recess 2A can rotate relative to each other within a predetermined range (a range until the holding piece 5 abuts the inner wall surface of the shoe holder 3, which will be described later). This tilting or rotation range is set to include at least the adjustment angle necessary to align the brake shoe 2 along the rim side of the wheel. The fitting recess 2A and the holding piece 5 of the mounting bolt 4 may have substantially concentric circular shapes, or one may be polygonal and the other may be shaped like a polygon, as shown in FIGS. It may have a circular or elliptical shape, or it may have any other non-restrictive shape as long as it is a pair of combinations in which the mounting bolt 4 and the brake shoe 2 can be tilted or rotated at least within a certain range. Reference numeral 3 denotes a shoe holder for holding the brake shoe 2 and projecting the shaft main body 4A of the mounting bolt 4, and in the case of this embodiment, it is constituted by a normal boat-shaped shoe holder. An insertion hole 3A is formed on the rear side of the shoe holder 3 to allow the shaft main body 4A of the mounting bolt 4 to protrude. This insertion hole 3A is set to have a diameter through which the restraint table portion 6 is inserted and which allows the restraint table portion 6 to freely rotate in the circumferential direction. Then, the brake shoe 2 has its fitting recess 2
It is held by the shoe holder 3 from the outside with the holding piece 5 of the mounting bolt 4 rotatably fitted into A,
The shaft main body 4A of the mounting bolt 4 is assembled with the shaft main body 4A of the shoe holder 3 protruding from the insertion hole 3A together with the restraining table 6 toward the rear side (see FIGS. 2 and 4). With this structure, in order to install the brake shoes 2 on the brake arms C and Y, first, insert the mounting bolts 4 into the mounting holes 8 and insert the restraining base portions 6 of the mounting bolts 4 into the mounting holes 8. Inserted into
Positioning is performed so that the abutting surfaces 6A, 6A of the restraining table portion 6 abut against the left and right side wall surfaces 8A, 8A of the mounting hole 8. Therefore, the brake shoe 2 and shoe holder 3 are adjusted by tilting them at an optimal angle along the longitudinal direction of the rim side surface R while the mounting bolt 4 is restrained in the mounting hole 8. Here, as mentioned above, the mounting bolt 4 and the brake shoe 2 can be tilted or rotated relative to each other within a certain range, so even if the mounting bolt 4 is fixed, only the brake shoe 2 can be freely moved within a certain range. Can take a tilted position. After the brake shoe 2 has been set in the optimum position in this manner, the nut N is screwed onto the mounting bolt 4 from the outside via the washer W and the bolt is tightened. During this bolt tightening, the torque applied to the shaft main body 4A through the nut N is applied to the side wall surface 8A of the brake arm mounting hole 8, 8A, and the mounting bolt 4 itself does not rotate. Thereby, the brake shoe 2 can be attached to the brake arm while being set in the optimum position in advance (see FIG. 4). Note that the abutting surfaces 6A are the left and right side wall surfaces 8A of the mounting hole 8.
It may be one that matches only one of the two. In addition, in the above embodiment, the case of a caliper brake and brake shoe for the front wheel with a normal configuration was illustrated, but the brake shoe mounting structure of this invention can also be used for a rear wheel and a different type of brake or other structure. In short, it can be applied to all types of bicycle brakes that are fixed to the brake arm by tightening the mounting bolts of the brake shoe, even if they are equipped with other adjustment structures. .

[Effect of the idea]

This idea prevents the mounting bolt from rotating by absorbing the torque when tightening the mounting bolt into the side wall of the brake arm mounting hole. There is no risk of misalignment. Therefore, there is no need to readjust the mounting position of the brake shoe when tightening the mounting bolts, and the mounting work can be carried out efficiently. Furthermore, it is extremely practical because conventional brake shoes and brake arms can be used as they are.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the brake shoe mounting structure, which is an embodiment of this invention, when used in a side-pull type caliper brake, Fig. 2 is a perspective view showing the installation state of the main parts, and Fig. 3 is the same. Front view of main parts, No. 4
This figure is a cross-sectional view of the same essential part, and FIGS. 5a to 5e are partial views showing different embodiments in which the fitting recess of the brake shoe and the holding piece of the mounting bolt are not constrained in shape. 2... Brake shoe, 2A... Fitting recess, 3
...Show holder, 4...Mounting bolt, 5...Pressure piece, 6...Restraint table, 6A...Abutment surface, 8...
...Mounting hole, 8A...Side wall surface, C, Y...Brake arm.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Insert the mounting bolt protruding from the rear side of the shoe holder that holds the brake shoe into the mounting hole of the brake arm, and so that the brake shoe faces along the side of the rim. The bicycle brake brake shoe mounting structure is bolted to the brake arm, and one end of the mounting bolt is perpendicular to the shaft body with a screw carved into the fitting recess provided on the back side of the brake shoe. A holding piece is fitted so as to be tiltable or rotatable within at least a certain range in the circumferential direction (direction of shaft rotation), and a mounting hole is inserted into the mounting hole insertion portion of the mounting bolt that is inserted into the mounting hole of the brake arm. A brake shoe mounting structure characterized by having an abutting surface that makes surface contact with the side wall surface in the left and right direction and suppresses rotation of the mounting bolt. (2) Claims for registration of a utility model characterized in that the abutting surfaces formed on the mounting bolt consist of oblique planes on both sides of a restraining platform integrally formed on the bolt base side of the mounting bolt and having a substantially elliptical cross section. Brake shoe mounting structure described in item 1.