JPS5823755Y2 - Attachment device for operating link for rear wheel brake device on bicycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting device for an operating link for a rear wheel brake system on a bicycle.

An embodiment of the present invention will be described below with reference to the drawings. In Fig. 1, a down tube 11 that supports a bicycle handlebar (not shown) and a chain stay 12 that supports a rear wheel (not shown) are respectively fixed. The vicinity of the hanger lug 13 is shown, and a mounting bracket 21 is welded to the lower surface of the base end 12a of the chainstay 12 by its pair of left and right arms 21a, 21a.

As shown in FIG. 2, the mounting bracket 21 is formed to have a U-shaped cross section, and a pair of left and right support parts Z4b, 21b7/ to which the crack lever 22 is pivotally attached are formed at the lower part of the mounting bracket 21. A stopper 21c that restricts rotation of the crank lever 22 is formed at the portion.

The crank lever 22 has a predetermined length as shown in FIG.
b, 21b by bolts 23 so as to be swingable in the longitudinal direction of the vehicle body.

Further, the tip of the crank lever 22 is connected to a stopper 24b of a tenth lever 24 that operates in the vertical direction of the vehicle body by operating a brake lever (not shown), and to a rear wheel brake device (not shown), which is connected to a rear wheel brake device (not shown) that operates in the longitudinal direction of the vehicle body. 20th operating
The front ends of the bolts 25 are rotatably connected to each other by pins 24a and 25a at a predetermined interval.

Furthermore, a mounting bracket 2 is attached to the back of the crank lever 22.
A locking piece 22a that engages with the lower surface of the stopper 21c of No. 1 is integrally formed, and the crank lever 22 is rotated as shown in solid line in FIG. As shown in , its backward rotation is restricted.

The tenth bolt 24 is fixed to the stopper 24b by a set screw 24c so that its position can be adjusted.

Therefore, when supporting the tenth lug 24 and the twentieth lug 25 on the bicycle body using the above-mentioned crank lever 22, the crank lever 22, which connects the stopper 24b and the twentieth lug 25, is attached to the mounting bracket 21 with the bolt 23. After the rear end of the 20th bolt 25 is connected to a rear wheel brake device (not shown).

At this time, since the backward rotation of the crank lever 22 is restricted by the locking piece 22a engaged with the stopper 21c of the mounting bracket 21, the mounting angle of the crank lever 22 is set in the direction of movement of the 20' throat 25. It is always held constant at approximately right angles to.

Therefore, when attaching the 20th bolt 25 to the rear wheel brake device, it is only necessary to pay attention to the distance between the shoe of the brake device and the braked member.

Thereafter, the tenth bolt 24 is inserted through the stopper 24b and fixed at an appropriate position with a set screw 24c.

Note that the 20th rod 25 is always urged rearward by a spring in the rear wheel brake device.

Next, the operation of the present invention constructed as described above will be explained. When the brake lever (not shown) connected to the tenth lever 24 is released, the crank lever 22 is held at its initial position shown by the solid line in FIG. has been done.

From this state, when the tenth lever 24 is pulled upward in the drawing by the brake lever, the crank lever 22 rotates clockwise in the drawing and swings to the position shown by the imaginary line in FIG. 25 is pulled forward, and the shoes of the rear wheel brake system come into contact with the braked member.

In this case, the movement stroke of the 20th throat 25 at the beginning of its movement is such that the direction of the acting force on the 20th throat 25 and the direction of the arm (crank lever 22 located between the bolt 23 and the pin 25a) relative to this are approximately at right angles. Therefore, the clearance between the shoes of the rear wheel brake device and the braked member is at its maximum during its operation, and the clearance between the shoes of the rear wheel brake device and the braked member is quickly eliminated.

In addition, in the latter half of the rotation of the crank lever 22, the first
The direction of action of the 20th bolt 24 and the direction of the crank lever 22 located between the bolt 23 and the pin 24a are approximately at right angles, as shown by the imaginary line in FIG.
The movement stroke of the crank lever 22 in the acting force direction 5 becomes smaller, and the force applied to the 20th arm 25 via the 10th arm 24 becomes maximum.

As a result, a strong braking force is generated in the rear wheel brake device.

Furthermore, when the user releases the brake lever after this braking, the crank lever 22 is rotated clockwise in the figure by the action of the spring in the rear wheel brake device, and the locking piece 22
a and the stopper 21c of the mounting bracket 21, it stops at its initial position.

In summary, in the present invention, as exemplified in the above embodiment, a portion of the mounting bracket 21 fixed to the lower surface of the chainstay 12 engages with the back of the crank lever 22, thereby causing the crank lever 22 to move rearward. A stopper is provided to restrict rotation and define the initial position of the crank lever 22 when the brake lever is released.
The structure is characterized by the fact that it is arranged at its initial position substantially perpendicular to the direction of movement of the 20th bolt 25, which makes it easy to increase the clearance between the shoes of the rear wheel brake system and the braked member. It can be adjusted to a predetermined amount, and it is possible to quickly bring the shoes of the rear wheel brake device into contact with the braked member at the beginning of the brake operation and apply the maximum operating force at the time of contact to obtain an appropriate braking force. can.

[Brief explanation of drawings]

FIG. 1 is a partial side view showing the vicinity of the hanger lug of a bicycle according to the present invention, and FIG. 2 is a longitudinal sectional view taken along line 22 in FIG. 1. Explanation of symbols, 11... Down tube, 12.
...Chain stay 13...Hanger rack, 21...Mounting bracket, 21c...
Stopper, 22...Crank lever 23...
...Bolt, 24...10th Tsudo, 25.
...20th Indian.

Claims (1)

[Scope of utility model registration request] The lower end of the 10th lever operates vertically along the down tube of the car body when the brake lever is operated, and the front end of the 20th lever is connected to the rear wheel brake system and operates longitudinally along the chainstay of the car body. , connected at a predetermined interval to the tip of a single crank lever that is pivotably supported in the longitudinal force direction of the vehicle body by a mounting bracket fixed to the lower surface of the chainstay in the vicinity of the hanger rack; A stopper is provided in a part of the metal fitting to restrict rearward rotation of the crank lever by engaging with the back of the crank lever and to define the initial position of the crank lever when the brake lever is released. A mounting device for an operating link for a rear wheel brake device on a bicycle, characterized in that a lever is disposed at an initial position substantially perpendicular to the direction of movement of the 20th lever.