JPS6219510Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting structure for a gripping member for reducing brake arm in a bicycle brake.

In a bicycle brake such as a caliper brake, a fixing bolt fixed to the brake shoe is inserted and fixed in the horizontal direction into the brake shoe attachment part of a pair of left and right brake arms, and the fixing bolt is inserted into the brake shoe attachment part of the left and right pair of brake arms. There is a type of brake in which a gripping member is fitted onto the outside and the gripping member is fastened and fixed to the brake shoe mounting part (for example, see Utility Model Publication No. 49-64942). When reducing both brake arms, such as when connecting the brake arm and the operating wire at the time of use, or when adjusting the distance between the brake shoe and the rim, there is an advantage that the above reduction can be easily performed by gripping both gripping members. . However,
A different type of brake from the above, i.e., one in which the fixing pin of the brake shoe is inserted into the head of the brake shoe mounting bolt, and the bolt is inserted and fixed into the brake shoe mounting portion in the front and back direction (for example, -Refer to Publication No. 13088), it is difficult to provide a gripping member on the fixed pin, etc. that corresponds to the fixed bolt, and in the past, the above type of brake was not equipped with a gripping member. This is the reality.

However, in order to provide a gripping member in the latter type of brake, the present applicant proposed
A device shown in Publication No. 165681 has already been proposed.
In this conventional type, a pair of left and right brake arms are arranged on both sides of the tire rim, the ends of the arms are used as brake shoe mounting parts, and the mounting parts have mounting holes parallel to the outer surface of the tire rim. A mounting bolt is inserted into the mounting hole, and a retaining hole perpendicular to the bolt axis is formed in the head of the mounting bolt that protrudes forward from the mounting portion, and a fixed pin is inserted into the retaining hole, approximately perpendicular to the tire rim. A brake shoe facing the tire rim is fixed to the end of the fixed pin, and a nut is screwed to the shaft of a mounting bolt that protrudes rearward from the mounting portion, so that the nut and the fixed pin are connected to each other. The pair of left and right brake arms are urged in the expansion direction by a spring, and the lower end of the spring extends downward to serve as a gripping part for reducing the brake arm. was.

However, in this conventional device, a flat portion was provided on the mounting bolt in order to prevent relative rotation between the mounting hole and the mounting bolt. Therefore, when the expansion angle of the brake arm changes, the contact angle between the brake shoe and the tire rim changes, resulting in a problem that proper braking cannot be obtained. In addition, since the brake arm contraction grip portion was constructed of a spring, it was elastically deformed when a contraction operation was performed, and there was a problem in that the arm did not fully contract.

Therefore, the present invention was devised in view of the above problems, and its characteristics are that a pair of left and right brake arms are arranged on both sides of the tire rim, and the ends of the arms are connected to the brake shoe mounting part. The mounting part has a mounting hole parallel to the outer surface of the tire rim, a mounting bolt is inserted into the mounting hole, and the head of the mounting bolt, which protrudes forward from the mounting part, has a hole parallel to the bolt axis. Orthogonal holding holes are opened, a fixed pin substantially perpendicular to the tire rim is inserted into the holding hole, and a brake shoe facing the tire rim is fixedly installed at the end of the fixed pin, protruding rearward from the mounting portion. A nut is screwed onto the shaft portion of the mounting bolt, and the mounting portion is held between the nut and the fixed pin, and the front surface of the mounting portion is formed into a curved surface, and the front surface of the mounting portion and the mounting portion are curved. A gripping member for reducing the brake arm is provided, which is composed of a washer portion that fits onto the mounting bolt between the fixed pins, and a gripping portion that integrally extends downward from the washer portion, and the rear surface of the washer portion is It is formed into a curved surface that follows the curved surface of the front surface of the attachment part, and the front surface is formed into a chrysanthemum seat that comes into contact with the fixed pin.

An example in which the present invention is applied to a center-pull type caliper brake will be explained below based on the drawings.
In FIG. 1, reference numeral 1 denotes an arm mounting bracket fixed to, for example, a front fork 2 of a bicycle frame. Reference numeral 3 denotes a pair of left and right brake arms, which are swingably supported by the arm mounting bracket 1 via an arm support shaft 4 at their midpoints. The upper ends of both brake arms 3 are connected by a hanging wire 5,
A central portion of the hanging wire 5 is connected to an operating wire 8 such as a Bowden wire via a hanging tool 6 and a bolt 7, and the operating wire 8 is connected to a brake lever device (not shown). Reference numeral 9 denotes a brake spring, which is wound around the arm support shaft 4, one end of which is latched to the rear protrusion 10 of the brake arm 3, and the other end latched to the front protrusion 11 of the arm mounting bracket 1. The brake shoe mounting portions 12 at the bottom of both brake arms 3 are always urged to expand outward about the arm support shaft 4. As shown in FIGS. 2 to 5, the brake shoe mounting portion 12 has a curved shape at the front, and is formed with a mounting hole 13 that penetrates in the front-rear direction and is elongated in the vertical direction. Reference numeral 14 denotes a pair of left and right brake shoes, which are composed of a brake piece 15 made of a rubber material or the like, a holding fitting 16 that holds the brake piece 15, and a fixed pin 17 fixed to the holding fitting 16. The mounting portion 12 is provided with a brake piece 15 and a holding metal fitting 16 inside thereof, and a fixed pin 17 placed horizontally on the front side thereof. Reference numeral 18 denotes a brake shoe mounting bolt with a circular cross section for removably attaching the brake shoe 14 to the mounting portion 12, and is inserted into the mounting hole 13 from the front side. It consists of a shaft part 20 which has a smaller diameter than the head part 19 and is inserted into the attachment hole 13, and a fixed pin 17 is inserted into the head part 19 so as to be freely insertable and removable. Fixed pin 17 in head 19 and shaft 20
A ring-shaped washer 22 of the brake arm reduction gripping member 21 is fitted between the brake arm reduction grip member 21 and the mounting portion 12, and front and rear washers 23 and 24 are fitted on the rear side of the mounting portion 12 of the shaft portion 20. At the same time, by screwing the nut 25 to the rear end of the shaft portion 20, the fixed pin 1
7. The washer part 22 and the front and rear washers 23 and 24 are fastened and fixed to the mounting part 12. The rear side of the washer part 22 and the front side of the front washer 23 are shaped to follow the mounting part 12, and the rear surface of the washer part 22 is finished with a satin finish. A chrysanthemum seat 26 is formed on the outer periphery of the washer portion 22 to be in contact with the fixed pin 17, so that the fixing force of the fixed pin 17 is increased compared to the conventional case. Further, a grip portion 27 having a hollow triangular shape when viewed from the front is integrally formed in the washer portion 22 in a downwardly protruding manner. It is located on the lower side of the portion 12, and the outer side of the grip portion 27 is inclined inward. Additionally, 28 indicates a bicycle tire, and 29 indicates a rim.

According to the embodiment configured as described above, when the operating wire 8 is connected to the hanging wire 5 via the hanging tool 6 when assembling the brake to the bicycle, and when the braking piece 15 of the brake shoe 14 and the rim 29 are connected, When adjusting the distance, if both brake arms 3 are to be reduced, the gripping portions 2 of both gripping members 21
By grasping 7, both brake arms 3 can be easily reduced.

In the embodiment, the present invention is applied to a center-pull type caliper brake, but the present invention can also be applied to a side-pull type caliper brake or a cantilever type brake.

As described in detail above, the present invention provides a bicycle brake in which brake shoe mounting bolts are inserted and fixed in the front and back direction into the brake shoe mounting portions of a pair of left and right brake arms, in which a gripping member for reducing the brake arm is attached to each of the mounting portions. The present invention uses the above-mentioned type of The brake can be easily equipped with a gripping member with a simple structure, and the rear surface of the washer portion is formed to follow the curved surface of the front surface of the mounting portion, and the front surface is formed into a chrysanthemum seat that abuts the fixed pin. Therefore, rotation of the brake shoe with respect to the mounting portion is prevented, and the mounting angle of the brake shoe can be changed freely, and even if the expansion angle of the brake arm is changed, an appropriate brake shoe mounting angle can be obtained.

The brake reduction gripping member of the present invention also functions as a tire support during tire replacement.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is a perspective view of the main parts, and Fig. 3 is A of Fig. 1.
4 is a sectional view taken along the line B-B in FIG. 3, and FIG. 5 is an exploded perspective view of the main parts. 3... Brake arm, 12... Brake shoe mounting portion, 14... Brake shoe, 18... Brake shoe mounting bolt, 21... Brake arm reduction gripping member, 22... Washer portion, 25... Nut, 27... Gripping part.

Claims (1)

[Scope of Claim for Utility Model Registration] A pair of left and right brake arms are arranged on both sides of the tire rim, the ends of the arms are used as brake shoe mounting parts, and the mounting parts have mounting holes parallel to the outer surface of the tire rim. , a mounting bolt is inserted into the mounting hole, a holding hole is provided in the head of the mounting bolt that protrudes forward from the mounting portion and is perpendicular to the bolt axis, and a fixed hole is provided in the holding hole that is substantially perpendicular to the tire rim. A pin is inserted, a brake shoe facing the tire rim is fixed to the end of the fixing pin, and a nut is screwed onto the shaft of a mounting bolt that protrudes rearward from the mounting part, so that the nut and the fixing bolt are screwed together. A mounting portion is held between a fixed pin and a front surface of the mounting portion is formed into a curved surface, and a washer portion that fits onto a mounting bolt between the front surface of the mounting portion and the fixed pin; A gripping member for reducing the brake arm is provided, which consists of a gripping part that integrally extends downward, and the rear surface of the washer is formed into a curved surface that follows the curved surface of the front surface of the mounting part, and the front surface is connected to the fixed pin. A mounting structure for a gripping member for reducing a brake arm in a bicycle brake, characterized in that the gripping member is formed on an abutting chrysanthemum seat.