JPH0357593Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a side-pull type caliper brake that has a center adjustment function to always maintain the distance between the bicycle brake shoe and the rim, so-called brake width, at an appropriate value. Regarding.

(Prior Art) Conventionally, side-pull type caliper brakes for bicycles include a C-shaped arch having an operating arm to which an inner wire is attached, a Y-shaped arch having an operating arm to which an outer wire is attached, and both arches. A support shaft that penetrates through each boss hole and is swingably supported, and a spectacle-shaped spring that biases the lower ends of both arches in the direction of expansion are generally widely used. As an example of a center adjustment device for a caliper brake, a spring holding body is rotatably provided on the support shaft, and a screw adjustment body support ring body is provided on the support shaft so as to be immovable around the axis. It is known that the support ring and the spring holder are connected to each other by a screw adjuster so that the spring holder is rotatable around the axis of a support shaft (for example, see Publication No. 51460/1983).

(Problems to be solved by the invention) In the above-mentioned conventional technology, the spring is spectacle-shaped, that is, there are two winding parts on the left and right, and due to spring manufacturing, the repulsive force on the left and right tends to be uneven, and it is difficult to install the spring on the vehicle body. In this case, the one-sided brake effect is adjusted by operating the screw adjustment body, but
The current situation is that a considerable amount of time is spent on adjustment work. Furthermore, since the entire winding part of the spring is exposed on both the left and right sides, the repulsive force on the left and right sides changes due to corrosion due to rain, mud, etc., and the function of the spring deteriorates, making it necessary to adjust the unilateral effect. Therefore, the winding portion of the spring is coated to prevent corrosion, but there is a problem in that the cost is considerably high.

In view of the above-mentioned circumstances, the present invention aims to minimize the exposed area of the spring, prevent the deterioration of its function, make it less likely that one side effect will occur, and improve the stability of the spring when it is attached to the vehicle body. There is.

(Means for solving the problems) In order to solve the above problems, the present invention takes the following technical measures.

That is, the present invention includes a C-shaped arch 1 having an actuating arm 13 to which an inner wire 21 is fixed;
A Y-shaped arch 2 having an actuation arm 15 to which an outer wire 20 is fixed, and a support shaft 3 that passes through each boss hole 4, 5 of both arches 1, 2 and supports it swingably.
and a spring 7 that urges the lower ends of both arches 1 and 2 in the expansion direction, one winding part 8 of the spring 7 is provided in the center, and this winding Inner hole 9 of rotating part 8
It is characterized in that the winding portion 8 is fixed to the support shaft 3 such that it cannot rotate relative to the support shaft 3.

(Function) According to the present invention, since the winding part 8 of the spring 7 is located at one place in the center and the support shaft 3 passes through the inner hole 9 of this winding part 8, the horizontal repulsive force of the spring 7 is reduced. is uniform, the brake width is maintained properly and stably, installation adjustment to the vehicle body is extremely easy and can be done in a short time, and furthermore, the exposed area of the spring 7 is reduced, preventing functional deterioration due to corrosion of the spring 7. Therefore, there is no need to adjust the brake effectiveness after installation on the vehicle body.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 to 4 show a first embodiment of the present invention, in which 1 is a C-shaped arch, 2 is a Y-shaped arch, and 3 is a spindle attached to the body of a bicycle (not shown). 3 penetrates each boss hole 4, 5 of both arches 1, 2 in an overlapping manner in the front and back, and supports it so as to be swingable.

Reference numeral 6 denotes brake shoes, which are respectively attached to the opposing lower ends of both arches 1 and 2.

Reference numeral 7 denotes a spring, which has an arch shape as a whole, and has a winding part 8 formed in the center of the arch, making it symmetrical. An engaging body 1 is held on a shaft 3 and protrudes at symmetrical positions on the back surfaces of both arches 1 and 2.
0 and 11 are engaged from the inside, respectively, as shown in FIG. 1, and both arches 1 and 2 are urged in a direction to constantly expand their lower ends.

A cylindrical support part 12 into which the inner hole 9 of the spring winding part 8 is fitted and supported is protrudingly provided on the back surface of the boss part of the Y-shaped arch 2, and the spring winding is carried out through this cylindrical support part 12. The support shaft 3 is inserted into the inner hole 9 of the rotating portion 8 .

The C-shaped arch 1 has an overhanging operating arm 13 at its upper end, and an inner wire connector 14 is attached to the tip thereof. Further, the Y-shaped arch 2 has an operating arm 15 extending in the middle thereof, and an outer connector 1 at the tip of the arm 15.
6 is installed. This outer connector 16
A spiral outer holder 17 is screwed into the outer holder 17, and a screw adjustment body 18 fitted onto the outer holder 17 is used to adjust the wire.

19 is the Bowden cable for brake operation,
It consists of an outer wire 20 and an inner wire 21 inserted into the outer wire 20. The end of the outer wire 20 is fixed to the outer holder 17, and the inner wire 21 is fixed to the inner wire connector 14.

Note that the Bowden cable 19 is connected to a brake lever provided on the bicycle handlebar.

The support shaft 3, as shown in FIG.
It has a flange 22 integrally formed in the middle of its axial length, and, following the front side of the flange 22, a rectangular attachment part 24 for attaching a single-effect adjustment fitting 23, which will be described later, is provided. The support shaft 3 supports both arches 1 and 2 in a relatively rotatable manner in the front half of the support shaft 3 with the brim 22 as a border, and the support shaft 3 supports the arches 1 and 2 in a relatively rotatable manner in the rear half thereof.
5 and 26 are inserted.

Further, screw portions 27 and 28 are provided at the front and rear ends of the support shaft 3, respectively, and a lock nut 29 and a cap nut 30 are attached to the screw portion 27, and a lock nut 29 and a cap nut 30 are provided to the screw portion 27, respectively.
A lock nut 31 is screwed onto each of the shafts 8 to firmly fix the support shaft 3 to the vehicle body. In addition, the second
As shown in the figure, a washer 32 is provided between the lock nut 29 and the C-shaped arch 1, a washer 33 is provided between the C-shaped arch 1 and the Y-shaped arch 2, and a washer 33 is provided between the lock nut 29 and the C-shaped arch 1 and the cylindrical support portion 12 of the C-shaped arch 1. Between the tsuba 22 is a single-effect adjustment fitting 23
are respectively mediated.

As shown in FIGS. 2 and 3, the single-effect adjustment fitting 23 has a square hole 34 in the center that is unrotatably fitted and fixed to the square mounting portion 24 of the support shaft 3, and the upper end has a horizontal upper surface. A single spring effectiveness adjusting piece 35 is formed in a protruding shape on the front side, and this single spring effectiveness adjusting piece 35 presses the upper surface of the center part of the spring 7 and supports the support shaft 3.
The spring 7 is prevented from tilting to the left or right. Note that a washer 36 is interposed between the spring 7 and the boss portion of the Y-shaped arch 2.

According to the first embodiment, the winding part 8 provided at the center of the spring 7 is fixed to the support shaft 3, and is attached to one side of the one-sided effect adjustment fitting 23 which is attached to the support shaft 3 in a non-rotatable manner. Since it is centered in advance by the effectiveness adjusting piece 35, the left and right repulsive forces of the spring 7 are equal, and the brake width is maintained appropriately.

Further, the attachment of the brake to the vehicle body I is extremely simple and can be done in a short time, and there is no need to adjust the one-sidedness of the brake after attachment to the vehicle body I.

5 and 6 show a second embodiment of the present invention, in which the cylindrical support part 12 of the spring 7 in the first embodiment is separated and independent from the boss part of the Y-shaped arch 2, and the cylindrical support part 12 is separated from the boss part of the Y-shaped arch 2. A rectangular hole 38 is formed in the rear end of the inner peripheral surface of the body 37, and the rectangular hole 38 is fixedly attached to the rectangular mounting portion 24 of the support shaft 3. The left and right ends 39 of the adjustment piece 35 of the one-side effect adjustment fitting 23 are bent downward, and the upper surfaces of both sides of the winding part 8 of the spring 7 are brought into contact with the ends, thereby adjusting the one-side effect. ing.

The other configurations of the second embodiment are exactly the same as those of the first embodiment, and the effects are also the same.
Detailed explanation will be omitted. Note that the second embodiment can be modified and implemented by replacing the spring and cylindrical support in the conventional brake with those having the above configuration.

The one-side effect adjustment fitting 23 can be integrally formed with the support shaft 3, and can be provided, for example, in a protruding manner in front of the collar 22 as a one-side effect adjustment piece. Furthermore, the number of turns of the winding portion 8 of the spring 7 can be selected as appropriate.

(Effect of the invention) As described above, the side-pull type caliper brake according to the invention has only one winding part 8 of the spring 7 in the central part, and the support shaft is provided in the inner hole 9 of this winding part 8. Since the spring 7 is fixed by penetrating through the spring 7, the left and right repulsive forces can be obtained evenly during the manufacturing process of the spring 7, and the accuracy is high.Therefore, the brake can be easily and stably installed by simply installing the brake properly on the vehicle body A. Moreover, the brake width can be centered quickly and accurately, and there is no need for center adjustment after installation on the vehicle body. In addition, since the winding portion 8 is not exposed on the left and right sides of the support shaft 3 as in the conventional case, the exposed area of the spring 7 is small, giving a good overall appearance and improving corrosion resistance against rain, mud, etc. Since the function of the spring 7 does not deteriorate and therefore the left and right brake shoes 6 do not become biased due to aging, there is no need to adjust the center of the brake width. In addition, when the spring 7 is coated with a corrosion-resistant coating, the exposed area is small and the structure is simple, so it can be carried out at low cost.

[Brief explanation of the drawing]

Figures 1 to 4 show the first embodiment of the present invention, with Figure 1 being an overall rear view and Figure 2 being A--A in Figure 1.
3 is a sectional view taken along line B-B in FIG. 2, FIG. 4 is a front view of the spring, and FIGS. 5 and 6 show the second embodiment. A sectional view corresponding to the figure, FIG. 6 is a sectional view taken along the line CC in FIG. 5. 1...C-shaped arch, 2...Y-shaped arch, 3...
Support shaft, 4, 5...Boss hole, 7...Spring, 8
... Winding part, 9 ... Inner hole, 13, 15 ... Actuation arm, 20 ... Outer wire, 21 ... Inner wire.

Claims (1)

[Scope of utility model registration request] Actuation arm 13 to which inner wire 21 is fixed
and a Y-shaped arch 2 having an actuation arm 15 to which an outer wire 20 is fixed.
, a support shaft 3 that passes through each boss hole 4, 5 of both arches 1, 2 and is supported swingably, and a spring 7 that biases the lower end portions of both arches 1, 2 in the expansion direction. In the side-pull type caliper brake, one winding part 8 of the spring 7 is provided in the center, and the support shaft 3 is passed through the inner hole 9 of this winding part 8 to support the winding part 8. A side-pull type caliper brake that is fixed to the shaft 3 so that it cannot rotate relative to it.