JPH0353990Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a bicycle braking device, and more specifically, a bicycle brake system that includes a mounting part for the chain stay that has a fixed base that is fixed to the chain stay of the bicycle, and a brake that is pivotally connected to the mounting part. The present invention relates to a bicycle braking device equipped with an arm.

(Prior Art) Conventionally, as this type of bicycle braking device, a brake arm for a rear wheel is swingably supported on the lower surface of a chain stay via a mounting portion having a fixed base, and a brake arm for a rear wheel is swingably supported on the lower surface of a chain stay. A wire guide is attached to the outer surface of the bicycle in the width direction so as to protrude laterally.
The operation wire for the rear derailleur, which is arranged from the front side of the bicycle along the down tube, bottom bracket, and chain stay, is guided to the rear derailleur side through the wire insertion path formed in the guide body, and the operation wire is A device in which the rear derailleur is operated by pulling or relaxing a wire is already known.

(Problem to be solved by the invention) By the way, in the above braking device, a wire guide body is attached to the outer surface in the bicycle width direction of the mounting portion fixed to the lower surface of the chain stay so as to protrude laterally. Since the operating wire is guided to the rear derailleur side through the wire insertion path in the body, the operating wire disposed along the chain stay is bent outward to a large extent near the guide body. The movement resistance of the operating wire becomes large, and the shift operability of the rear derailleur becomes poor, and the wire guide body
Alternatively, there is a problem that the operating wire guided by the guide body interferes with the front chain gear supported by the bottom bracket.

The present invention was devised in view of the above-mentioned problems, and its purpose is to form a guide path for the operating wire at a position near the center in the width direction of the bicycle by using the mounting portion, and to connect the operating wire through the guide path. By guiding the operating wire along the chain stay with a small amount of displacement without bending the operating wire to a large extent, the movement resistance of the operating wire is reduced and the speed change operability of the rear derailleur is improved. An object of the present invention is to provide a bicycle braking device that can prevent the front chain gear and the front chain gear from interfering with each other.

(Means for Solving the Problems) The present invention provides a mounting part 1 for the chain stay that has a fixed base 11 that is fixed to the chain stay of the bicycle.
and a brake arm 2 pivotally connected to the mounting portion 1, the bicycle braking device comprising:
The present invention is characterized in that a wire guide path 5 for guiding the operating wire along the chain stay is provided at a position closer to the center of the bicycle in the width direction than the outer surface of the fixed base 11.

(Function) Therefore, the operating wire is guided at a position closer to the center in the width direction of the bicycle via the wire guide path 5 formed in the mounting portion 1, so that the amount of bending displacement of the operating wire is small. Along with this, the movement resistance of the operating wire is also reduced, and the shift operability of the rear derailleur is improved.Also, since the operating wire is guided at a position closer to the center in the width direction of the bicycle, the operating wire and the front This also eliminates the possibility of the chain gears interfering with each other.

(Embodiments) The bicycle braking device according to the present invention will be described below with reference to embodiments shown in the drawings.

The drawing shows a cantilever type caliper brake as a bicycle braking device, and the basic structure is that each chain stay S is installed on the lower surface side of each chain stay S that extends rearward in parallel from the bottom bracket B. A pair of mounting parts 1, 1 having a fixed pedestal 11 to be fixed to the mounting parts 1, 1 are attached, and a pair of brake arms 2, 2 each having a brake shoe 21 are attached to the respective mounting parts 1, 1, respectively. The brake arms 2, 2 are supported swingably through the brake shoes 21, 21 between the mounting parts 1, 1 and the brake arms 2, 2. A pair of return springs 4, 4 are interposed therebetween to bias in a direction in which the distance between the two is increased.

The fixing base 11 of each mounting portion 1 is formed in a cylindrical shape from a light alloy such as an aluminum alloy, and has a screw hole 11a provided on its inner surface, and each of the support shafts 3 is formed from a hard material such as iron. A screw portion 31 that can be screwed into the screw hole 11a is provided on one side in the length direction, a shaft portion 32 that supports each brake arm 2 is provided on the other side in the length direction, and A rectangular operating portion 33 with a large diameter is formed at the intermediate portion of the threaded portion 31 and the shaft portion 32, and the threaded portion 31
Each of the support shafts 3 is fixed to each of the mounting portions 1 by screwing them into the screw holes 11a.

Further, each of the brake arms 2 is formed into a bell crank shape with a bent intermediate portion, and each of the intermediate portions is swingably supported by the shaft portion 32 of the support shaft 3. - Each shoe 21 is attached to one side in the length direction of the arm 2, and a suspension wire w is installed between the other ends, and a carrier C is attached to the center of the suspension wire w, and a bicycle is attached to the carrier C. from the front side of the bottom bracket B
A brake operation wire BW guided along is connected.

Furthermore, at the rear part of the caliper brake,
A rear derailleur (not shown) is installed, and this rear derailleur is connected to the rear derailleur operation wire DW, which is arranged from the front side of the bicycle along the down tube D, the lower surface of the bottom bracket B, and the chain stay S. The gear shift is operated via the .

However, in the above structure, one of the mounting parts 1 fixed to the lower surface side of each chain stay S is used as a wire guide path for guiding the operating wire DW of the rear derailleur. 5, and this wire guide path 5 is formed at a position closer to the center in the bicycle width direction than the outer surface of the fixed pedestal 11 in the mounting portion 1.

Specifically, as shown in FIGS. 1 to 3, the fixed pedestal 1 constituting the mounting portion 1
A notch groove of a predetermined depth extending in the front-rear direction and crossing the screw hole 11a is formed on the outer end surface facing the operating portion 33 of 1, and this notch groove is used as the guide path 5, Further, an annular receiving surface 34 protruding into the guide path 5 is provided on the outer periphery between the threaded portion 31 and the operating portion 33 of the support shaft 3 fixedly supported by the fixed pedestal 11, so that the guide path The operating wire DW guided by 5 is brought into contact with the annular receiving surface 34.

By doing so, the operating wire DW is guided along the guide path 5 at a position closer to the center in the bicycle width direction than the outer end surface of the fixed pedestal 11, and therefore, the operating wire DW is guided to the outside of the operating wire DW. The amount of bending displacement of the rear derailleur is reduced, the movement resistance is also reduced, and the speed change operability of the rear derailleur is improved.Furthermore, there is no protrusion on the outer end surface of the fixed base 11, and the operation wire DW is
Since the operating wire DW is guided inward from the outer end surface of the fixed pedestal 11, the operating wire DW etc. and the front chain gear do not interfere with each other, and the operating wire DW is made of a hard material. Since the guide path 5 contacts the annular bearing surface 34 of the support shaft 3 made of a light alloy, there is no wear on the fixed pedestal 11 made of a light alloy. Since the notched groove is formed, it is possible to prevent the wire DW from coming off outward from the guide path 5 when the operating wire DW is loosened. In addition, the guide path 5
may be formed in a concave shape with only the outer end surface of the fixed base 11 facing the operating portion 33 open, or may be formed with an open groove extending across the outer end surface and the outer surface.

In forming the guide path 5 for the operating wire DW, for example, as shown in FIG. In the case of the mounting portion 1 which is interposed between the outer end surface of the washer 11 and the large-diameter square operation portion 33 provided at the longitudinally intermediate portion of the support shaft 3, the outer end surface of the washer 12 is As in the case described above, the guide path 5 made of a notched groove may be formed, and the annular receiving surface 34 may be provided at a portion of the support shaft 3 facing the guide path 5.

Furthermore, in forming the guide path 5 for the operating wire DW, a through hole 5a extending in the front-rear direction is formed in the wall portion of the fixed pedestal 11 in the mounting portion 1, as shown in FIG. It is also possible to press fit a sleeve 6 made of a hard material into the through hole 5a and use the inside of this sleeve 6 as the guide path 5 for the operating wire DW, and the same effect as described above can be obtained. be.

Furthermore, if the mounting portion 1 is made of a hard material such as iron, the operating wire DW may be brought into contact with the guide path 5 without using the support shaft 3. Furthermore, in the case of FIG. 5, the through hole 5a formed in the mounting portion 1 may be used as the guide path 5 and the operating wire DW may be directly inserted therethrough without using the sleeve 6. be.

In the embodiment shown in FIG. 2, an adjusting means 7 is provided for adjusting the force exerted by the return spring 4 on each brake arm 2.

(Effects of the Invention) As explained above, in the present invention, the attachment part 1 to the chain stay S having the fixed pedestal 11 fixed to the chain stay S of the bicycle, and the brake arm 2 pivotally attached to the attachment part 1 are provided. In the bicycle braking device, the mounting portion 1 includes the fixed base 11.
Since the wire guide path 5 for guiding the operating wire DW along the chain stay S is formed at a position closer to the center in the width direction of the bicycle than the outer surface of the bicycle,
Compared to the conventional art, the amount of bending displacement of the operating wire DW is smaller, the movement resistance of the operating wire DW can be reduced, and the shift operability of the rear derailleur can be improved. Moreover, the wire guide path 5 is formed at a position closer to the center in the bicycle width direction using the mounting portion 1, and the operating wire DW is guided by this guide path 5. This prevents the protruding object from protruding outward, and it is therefore possible to prevent the protruding object, the operating wire DW, and the front chain gear from interfering with each other.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing a bicycle braking device according to the present invention, FIG. 2 is a partially cutaway bottom view of the same,
FIG. 3 is a longitudinal cross-sectional view of the same essential part, and FIGS. 4 and 5 are longitudinal cross-sectional views showing other embodiments. 1... Mounting part, 11... Fixed pedestal, 2... Brake arm, 5... Wire guide path, S... Chain stay, DW... Operation wire.

Claims (1)

[Scope of utility model registration request] Fixed pedestal 11 that is fixed to the bicycle chain stay
A bicycle braking device is provided with a mounting part 1 for attaching to the chain stay, and a brake arm 2 pivotally connected to the mounting part 1, the brake arm 2 being attached to the mounting part 1 from the outer surface of the fixed pedestal 11. A bicycle braking device characterized in that a wire guide path 5 for guiding an operating wire along the chain stay is provided at a position closer to the center in the width direction.