JPS5918956Y2 - bicycle brake - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a bicycle brake, in particular, a pair of left and right brake rubber backings facing each other across the rim of the wheel. At the same time, the base ends of the first and second arms are pivotally supported on the vehicle body so as to be able to swing open and close in the left-right direction, and common operations such as operation cables are connected to the first and second arms. The mechanisms are connected so that when the operating mechanism is activated, the operating force of the operating mechanism acts on one of the first and second arm sections, and the reaction force against the operating force acts on the other arm. The present invention relates to a type in which the pair of brake rubbers can be pressed against the rim with equal force through the portion.

With the above type of bicycle brake, the left and right brake rubbers can be pressed against the rim with equal contact force on the left and right sides by a common operating mechanism, so there is no difference in the amount of wear between the left and right brake rubbers. A good braking effect can always be obtained, and since there is no need to provide left and right operating mechanisms independently, it has advantages such as a simple structure and reduced cost, and has been more widely practiced than before.

However, in the above-mentioned type of brake, the enormous braking torque received by each brake rubber that is pressed against the wheel rim during braking is received by the vehicle body via the brake caliper. A large bending load is applied to the second arm, and in order to resist this, it is necessary to specially increase the rigidity of the caliper, resulting in an increase in weight and cost.

The purpose of the present invention is to provide a bicycle brake that can eliminate the above-mentioned drawbacks, has a high braking effect, and can effectively suppress uneven wear of the brake rubber.
In the bicycle brake of the above type, one end of each of the pair of back metals is pivotally attached to the right and right leg parts of the vehicle body fork part, and each other end of the back metal is attached to the first end of the back metal. ,
The reason lies in that the respective tips of the second arm portions are connected via a ball joint.

Hereinafter, an embodiment in which the present invention is applied to a front wheel brake of a bicycle will be described with reference to the drawings. The legs 1a, lb
U-shaped cross-section metal fittings 3a and 3b are fitted to the upper part of the
These metal fittings 3a, 3b are attached to each leg portion 1a, 1b by screwing a nut 5 onto a bolt 4 passed between both legs and tightening.
is fixed to.

A bifurcated projection 5a is provided on the front outer surface of each metal fitting 3a, 3b.

6b is fixedly installed, and in the gap between the protrusions 6a and 6b, a pair of left and right brake rubbers 20 facing each other with the rim 21 in between is provided.
Plate-shaped protrusions 8a, 8b fixed to the respective rear ends of the back metals 7a, 7b of a, 20b are fitted, and pivoted by pins 9a, 9.
b.

The front ends of the back metals 73, 7b are connected to the lower ends of the first and second arm parts 11a, 11b of the brake caliper 11, which straddles the front wheel 2, via ball joints 10a, 10b, respectively.

The first arm portion 11 a and the second arm portion 1 of the brake caliper 11
1b is pivotally supported by a pin 13 fitted into a hole 12 of the fork connecting portion so as to be able to swing open and close in the left-right direction.

A cylindrical body 14 is attached to the pin 13, and the intermediate part of the return spring 1b that straddles the front wheel/wheel 2 is held in the cylindrical body 14, and both ends 15a, 15b of the spring 15 are attached to the first and second arm parts. 11
a, 11b are engaged with shaft portions 16a, 16b protruding from the back surface, and apply force in the opening direction to both arm portions 11a, 11b.

The lower end of the inner 17 of the operating cable C is connected to the upper end extension of the first arm 11a, and the upper end of the inner 17 is connected to a brake lever (not shown).

The inner 17 is inserted through the intermediate protrusion 18 of the second arm portion 11b, and covers the upper surface of the intermediate protrusion 18.

The lower end of the outer 19 of the operating cable C is connected, and the upper end of the outer 19 is connected to a brake lever holding fitting (not shown).

Next, the operation of this embodiment will be explained.

When the brake lever is pulled to pull the inner 17 upward, the outer 19 moves downward due to the accompanying reaction force, so the first and second arm portions 11 a of the brake caliper 11
11b respectively rotate inward around the pin 13,
Close the brake caliper 11.

The back metals 71 and 7b are connected to the metal fittings 3a and 3.
The brake rubbers 20a and 20b rotate inwardly around the pivot points 9a and 9b, respectively, and press the friction surfaces of the brake rubbers 20a and 20b against both sides of the rim 21 to apply braking.

In this case, even if the back metals 7a and 7b swing around the pivot points 9a and 9b, and the first and second arm parts 11a and 11b swing around the pin 13, the wheel rim 21
Even if both side surfaces of the ball joint 10a are slightly inclined in the radial direction, the three-dimensional relative rotational displacement between the brake rubber 20a, 20b or the back plate 7a, 7b and the first and second arm portions 11a, llb can be controlled by the ball joint 10a. , 10b, and therefore, the front surfaces of the brake rubbers 20a, 20b can be brought into substantially uniform pressure contact with both side surfaces of the rim 21 over the entire surface thereof, even by their relative rotational displacement.

As described above, according to the present invention, a pair of left and right brake rubbers 20a, 20b (
7) The back metals 7a, 7b are connected to the tips of the first and second arm portions 11a, 11b of the brake caliper 11 that straddles the outer periphery of the wheel 2, and the first and second arm portions 11a,
The first and second arm portions 11a each have their respective proximal ends supported on the vehicle body so as to be able to swing open and close in the left-right direction.

A common operating mechanism such as an operating cable C is connected to 11 b, and when this operating mechanism is operated, the first and second arm portions 11
The pair of brake rubbers 20a is applied to the brake rubber 20a through the arm portions 11a and llb in such a manner that the operating force of the operating mechanism acts on one of the operating mechanism and the reaction force against the operating force acts on the other. , 20bl can be pressed against the brake rubber 21 with equal force, so the pair of left and right brake rubber 2
0a and 20b can be pressed against the rim with equal pressing force on the left and right sides by a common operating mechanism, so there is no difference in the amount of wear between the left and right brake rubbers 20a and 20b, and a good braking effect can always be obtained. Furthermore, since there is no need to provide separate left and right operating mechanisms, the structure is simple and costs can be reduced.

Particularly, one end of each of the pair of backing metals 78, 7b is pivotably pivoted to the left and right leg portions 1a, lb of the vehicle body fork portion 1;
9b, and the respective tips of the first and second arm portions 11a, 11b are connected to the other end portions of the back metals 7a, 7b, so that each brake rubber 20a is closed during braking.

The powerful braking torque received by 20b is transferred to the vehicle body fork portion
The brake caliper 11 can be directly received by the left and right leg portions 1a and 1b of the brake caliper 11, and the load on the brake caliper 11 can be significantly reduced, thereby reducing its weight and cost.

Moreover, pivot points for the fork legs 1a, lb and caliper arm 1 are provided at one end and the other end of the back metals 71, 7b.
The points of action of 1 a and 11 b are located respectively,
Since those points are separated from each other, the back metals 7a and 7b
The rotational moment between the pivot points can be maximized, and the braking force is efficiently transferred from the caliper arms 11a, 11b to the wheels 2 via the back metals 71, 7b and the brake rubber 20a, 20b. It can be made to work well.

Furthermore, a ball joint 10a is provided between each tip of the first and second arm portions 11a, llb and the other end of each back metal 7a, 7b.

10b, the backing metals 7a and 7b move around the pivot joints 9a and 9b and around the caliper arm 11 during braking.
Even if the brake rubbers 20a, 11b respectively swing around the shaft support 13, or even if both side surfaces of the wheel rim 21 are slightly inclined in the radial direction, the brake rubbers 20a, 20b or the back plate 7
The three-dimensional relative rotational displacement between the caliper arms 11a and 11b and the caliper arms 11a and llb can be easily tolerated by the ball joints 10-a and 10b. Brake rubber 20a, 20 on both sides
(b) The front surface can be brought into substantially uniform pressure contact over its entire surface, further increasing the braking effect and suppressing uneven wear of the brake rubbers 20a and 20b.

[Brief explanation of drawings]

Figure 1 is a perspective view of one embodiment of the present invention, Figure 2 is Figure 1 I.
A sectional view taken along line I-II, and FIG. 3 is a perspective view of the brake caliper. la, lb...fork leg, 2...front wheel as a wheel, 7a, 7b...back metal, 9a, 9b...pivot, 10a, 10b...ball joint, 11... Brake caliper, 11a, 11b...first and second arm portions, 20a, 20b-...brake rubber, 21.
...Rim, C...Operation cable.

Claims (1)

[Scope of utility model registration request] The pair of left and right brake rubbers 20a, 20b facing each other across the rim of the wheel 2, and the backing metals 73, 7b of the brake caliper 11 that straddles the outer periphery of the wheel 2 are connected to the first and second arm portions 11
a, llb, and a pivot support 13 that allows the base ends of the first and second arm portions 11a, 11 and b to swing open and close in the left-right direction on the vehicle body; Arm part 11a
, 11b is connected to a common operating mechanism such as an operating cable C, and when this operating mechanism is operated, the first and second arm portions 1
The pair of brake rubbers 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 20a, 11b, 1a, 11b is applied with the operating force of the operating mechanism 1a, 11b, On the other side(s), Reaction force against the operating force acts on the other side, respectively 20b can be pressed against the rim with equal force, one end of each of the pair of back metals 71.7b is swingably pivoted to the left and right leg parts 1a, lb of the vehicle body fork part 1. 9a, 9bL, the first and second arm portions 11 at the other ends of the back metals 7a, 7b.
A bicycle brake, characterized in that the tips of parts a and 11b are connected via ball joints 10a and 10b.