JPS5934748Y2 - Caliper brake arm deflection prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a brake arm deflection prevention device for a bicycle caliper brake.

A caliper brake is equipped with a pair of brake arms,
The brake arm is swingably supported around a fixed pivot on the bicycle frame, and is provided with a shoe at its lower free end that can move toward and away from the bicycle rim.

Therefore, when this brake arm brings the shoe into contact with the bicycle rim and applies braking, the free lower end of the brake arm, which has the shoe on the opposite side of the support end supported by the fixed pivot, bends in the direction of rim rotation. It was easy.

Therefore, in order to prevent such bending of the brake arm, conventional methods (for example, the one described in Japanese Utility Model Publication No. 33-2023) have been designed to prevent bending between the lower end of the brake arm having the shoe and the bicycle frame (usually a fork). The tension of the wire was used to prevent the wire from bending.

However, in such deflection prevention means, a specially manufactured wire fastener is used to connect the end of the deflection prevention wire to the brake arm, which increases the number of parts and makes installation complicated. This method requires special processing to attach the stopper, which has disadvantages such as high cost.

The present invention improves the above-mentioned drawbacks of the conventional brake shoes by using the existing washer used for fixing the brake shoes as a stop for the brake arm side of the deflection prevention member.
The purpose is to provide a caliper brake arm deflection prevention device that can reduce the number of required parts and simplify installation, and its features are as follows:
A pair of brake arms are provided on the bicycle frame so as to be able to swing freely around a fixed axis, and a mounting hole that is a long hole in the vertical direction is formed at the lower end of the brake arm so as to pass through it laterally, and the brake arm is attached to the brake shoe. A bolt shaft is inserted into the hole, and by screwing a nut to the tip of the bolt shaft, the brake shoe is fixed to the lower end of the brake arm so that it can be moved vertically, and the lower end of the brake arm at the bolt shaft is fixed to the lower end of the brake arm. In a caliper brake with a washer between the nuts, the washer
A pair of upper and lower claws that are inserted into the mounting holes are integrally provided on the outer circumferential side, and a flexible deflection prevention member that prevents the brake arm from breaking is attached to the bicycle frame at the midway point in the length direction. It is wound in a circumferential shape, and each end is placed in the water of the washer in the upper and lower vicinity of the bolt shaft, and one end is fixed to the washer, and the other end is attached to the washer and the lower end of the brake arm. It is at the point where it is clamped and fixed.

Hereinafter, embodiments of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a side-pull caliper brake;
It is separated from a C-shaped brake arm 2 and a Y-shaped brake arm 3.

The pair of brake arms 2 and 3 are swingably supported around a fixed pivot shaft 5 which is inserted through and fixed to, for example, a horn 4 as shown in the figure, of an automobile frame.

Reference numeral 6 denotes a brake shoe, which protrudes into each shoe mounting hole 7, which opens at the opposing lower ends of the arms 2 and 3 and is elongated in the vertical direction. In addition to protruding from the inside of the brake arm toward Yu HUIJ,
The bolt shaft 8 is attached to the lower end portions of each of the brake arms 2 and 3 by tightening a nut 9 to the protruding end of the bolt shaft 8 via a washer 10.

In the above structure, the present invention wraps the lengthwise midway part 11a of the U-shaped bent side of the flexible prevention member 11 folded in half around the bifurcated leg part 4a of the horn 4, and wraps both end parts 11b with the washer 10.
It is combined with .

Of course, the deflection prevention member 11 is attached to both the brake arms 2 and 3.

If a stranded wire whose surface is covered with a plastic tube is used as the deflection preventing member 11, a large tensile force can be obtained, and it is also easy to bend and wind around the leg portion 4a of the horn 4.

As a means for connecting the deflection prevention member 11 to the washer 10, the deflection prevention member 11 is provided inside the outer circumferential side of the washer 10.
A pair of claws 12 and 13 are provided on both sides of the arm 2 or 3 to project from both sides of the arm 2 or 3, and one of the claws 12 is attached to the washer-coupled side of the deflection prevention member 11. One side 11c of both ends 11b of is fixed in advance by welding or the like, and after inserting the washer 10 into the bolt shaft 8, the forked end 11 of the deflection prevention member 11 on the side to which the washer is connected is inserted.
The other 11d of b is wound around the horn 4 and then the washer 10
The washer 10 and the arm 2 are placed on the other claw 13 of the
Alternatively, the nut 9 may be clamped and fixed between the lower ends of the bolt shaft 8 by force. is fixed.

The present invention is designed to prevent the bending prevention member 11 from bending even if the lower end portions of the brake arms 2 and 3 having the grooves are bent in the rotational direction A of the bicycle rim shown in FIG. 2 during braking. The deflection deformation can be prevented by the tension of the brake arm 2 of the deflection prevention member 11.
Since the washer 10 used to fasten the lower end of . Only the single member 11 is required, and it can be installed extremely easily.
Furthermore, it has advantages such as simple structure and cost reduction.

In particular, in the present invention, the flexible deflection prevention member 11 is wound around the bicycle frame 4 at a midway point in the length direction, and one end 11c is fixed to the washer 10, and the other end 11d is fixed to the washer 10. 10 and the lower ends of the brake arms 2 and 3, the deflection prevention member 11 is secured to the bicycle frame 4, the lower ends of the brake arms 2 and 3, and the washer 10.
The structure is annular with the bicycle frame 4 as an inner part, and therefore, there is no risk that the deflection preventing member 11 will accidentally come off from the bicycle frame 4, and its deflection preventing effect is not limited to dogs. be.

Moreover, when attaching the deflection preventing member 11, by screwing the nut 9 while pulling the one end 11d side to be clamped and fixed, the deflection preventing member 11 can be easily attached in a tensioned state.

Also, since the washer 10 is integrally provided with a pair of upper and lower claws 12 and 13 that are inserted into the mounting hole 7 of the brake arm 2.3,
The washer 10 is prevented from rotating relative to the lower ends of the brake arms 2 and 3 by the pawls 12.13, so there is no risk that the deflection prevention member 11 will loosen or come off due to rotation of the washer 10. .

Furthermore, since the respective ends 11c and 11d of the deflection preventing member 11 are tucked into the claws 12 and 13 of the washer 10, the respective ends 11e and lld of the deflection preventing member 11 are fixed to the washer 10, and The clamping and fixing between the washer 10 and the lower ends of the brake arms 2 and 3 can be easily and reliably performed in good condition, and even if the nut 9 becomes loose, the end 11d of the deflection prevention member 11 on the clamping and fixing side will come off. Hateful.

In particular, in the present invention, each end 11c of the deflection prevention member 11,
11d are fixed in the vicinity of the top and bottom of the bolt shaft 8 of the brake pad, so that when the brake pad 8 is brought into contact with the bicycle rim to perform braking, the movement of the brake pad itself in the rim rotation direction is directly and Therefore, in the above case, it is possible to reliably prevent the brake arms 2 and 3 from bending, and even if the brake arm is in the vertical position with respect to the brake arms 2 and 3, the brake arm 2 can be prevented from bending. , 3 can be reliably prevented from deflecting.

[Brief explanation of drawings]

Fig. 1 is a front view of a caliper brake showing an example of the proposed device, Fig. 2 is a side view, Fig. 3 is a partially enlarged sectional view, and Fig. 4 is a front view of a caliper brake showing an example of the proposed device.
The figure is an exploded perspective view of essential parts. 2.3...Flake arm, 4...
Hawk (bicycle frame), 5... Fixed axis, 6... Brake shoe, 8... Bolt shaft, 9... Nut, 10...・・Washer, 1
1... Deflection prevention member.

Claims (1)

[Scope of utility model registration request] A pair of brake arms are provided on the bicycle frame so as to be able to swing freely around a fixed axis, and a mounting hole that is a long hole in the vertical direction is formed at the lower end of the brake arm so as to pass through it laterally, and the brake arm is attached to the brake shoe. A bolt shaft is inserted into the hole, and by screwing a nut on the tip of the bolt shaft, the brake shoe can be moved and adjusted in the vertical direction at the lower end of the brake arm, and the brake arm can be attached to the bolt shaft. In a caliber brake equipped with a washer between the lower end and the nut, the washer has a pair of upper and lower claws that are inserted into the mounting holes and integrally protrudes from the outer peripheral side to prevent the brake arm from deflecting. The anti-deflection member is wound around the bicycle frame at its midpoint in the longitudinal direction, and each end of the member is placed in the vicinity of the top and bottom of the bolt shaft, with each end held in each water of the washer, and one end is fixed to the washer. A caliper brake arm deflection prevention device characterized in that the other end is clamped and fixed between a washer and a lower end of the brake arm.