JPS6328781A - Caliper brake gear for bicycle - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a caliper brake device for a bicycle, and more specifically to the provision of a new type of brake device of the side-pull type with a built-in return spring.

(Prior Art) Generally, a side-pull type caliper brake device includes a Y-shaped first arm 30 and a C-shaped second arm 31, as shown in FIG. It is supported so that it can swing freely. Each of the arms 30 and 31 is connected to an outer wire and an inner wire (not shown), and is configured to perform braking by pulling the inner wire.

In this configuration, a return spring 33 (so-called eyeglass spring) that urges both arms 30, 31 in a direction away from each other is provided on the back side of both arms 30, 31, and the center part of the spring 33 is used to hold the spring. It is held in the body 34, and its free end is resiliently engaged from the inside with a notch 35 of a pin 36 attached to each arm 30.degree. 31, as shown in FIG.

In order to perform braking with the brake device configured as described above, the arms 30 and 31 are swung inward against the return spring 33. At this time, the free ends of the springs 33 move inward toward each other. At the same time, it slid in the direction of the arrow with respect to the pin 36, creating a large frictional resistance at this contact portion.

Therefore, grease was supplied to this contact area in an attempt to reduce frictional resistance, but since this contact area is exposed, it eventually wears out over a long period of use, causing the braking operation to become difficult. Not only does the brake become heavy and smooth braking is not possible, but it also causes squeaks and one-handedness.

Therefore, in order to compensate for the above-mentioned drawbacks, a structure was developed to reduce the frictional resistance of this contact part.
It is disclosed in Publication No. 16. This structure has the seventh
As shown in the figure, the free end of the spring 33 is in contact with a roller-shaped spring receiver 37 that is fixedly or rotatably attached to a pin 36, and a synthetic resin material layer 38 is formed on the surface of each free end. is formed.

(Problem to be Solved by the Invention) However, in the device equipped with the spring receiver 37 described above, if the spring receiver 37 is fixed to the pin 36, for example, the spring 33 cannot but slide on the spring receiver 37. I can't do it. On the other hand, if the spring receiver 37 is rotatable, the spring receiver 37
If mud or the like adheres to the pin 36, the spring receiver 37 may not rotate smoothly, and play may occur between the pin 36 and the spring receiver 37 after long-term use.
In both of these cases, it was not possible to sufficiently reduce the frictional resistance of the sliding portion between the spring 33 and the pin 36 during braking.

Furthermore, since a spring holder 34 for holding the spring 33 is required and a spring receiver 37 etc. is provided on the sliding part,
This complicated the structure and caused problems with productivity.

In addition, since the spring 33 is attached to the external rear surface of the arm 30, 31, it may cause a problem and may not be able to perform its function satisfactorily due to the adhesion of mud or the like.

Furthermore, since the pin 36 protrudes to the outside, there is a risk of damage.

In view of the above-mentioned conventional problems, the present invention enables the braking operation to be performed lightly even over a long period of time, and suitably prevents one-sidedness, which is a drawback of side pull, to be promoted.
Another object of the present invention is to provide a new type of brake device that can prevent squeaks with a simple structure and perform braking smoothly.

(Means for solving the problem) The technical means taken by the present invention to achieve the above object are as follows.

The first brake shoe includes brake shoes 5, 5 that come into contact with and separate from the rim of the wheel.
The boss portions 7.8 of the arm 3 and the second arm 6 are swingably supported on the fixed shaft 1, and the arms 3.6 are biased in directions away from each other, wherein each of the arms A recess 931O is provided around the axis of the fixed shaft 1 on the facing side of the boss portions 7 and 8 of 3.6, and a spring storage chamber 11 is formed by the recesses 9 and 10, and within the spring storage chamber ll, A coil return spring 17 fitted onto the fixed shaft 1
is housed, both legs 18.18 of the spring 17 are engaged with the boss portions 7.8 of each arm 3,6, and on the other hand,
The spring relief of the detent body 12, 13 is provided with a spring relief portion 16 which corresponds to each boss portion 7.8, is not rotatable relative to the fixed shaft 1, and further determines the swinging range of the arm 3.6. The point is that it is inserted into and engaged with the portion 16.

(Function) In FIGS. 1 and 2, the oval hole 14.14 of the detent body 12.13 is engaged with the arm holding portion 2 of the fixed shaft 1 except during braking. Therefore, the detent bodies 12 and 13 cannot rotate relative to the fixed shaft 1. On the other hand, both legs 18.18 of the coil return spring 17 are inserted into the spring relief portions 16.16 of the detent body 12.13, and are engaged with the boss portions 7.8 of the arms 3, 6, so that the spring 1
7 tries to separate arms 3 and 6 from each other, but both legs 1
8.18 are brought into contact with one end of the spring relief part 16.16, respectively, the posture of the arms 3 and 6 is maintained, and the brake device is prevented from rotating around the axis of the fixed shaft 1. .

In the case of braking, each arm 3.6 is swung in a direction against the bias of the spring 17 by pulling the inner wire, and both legs 18.1 move within the range of the spring relief part 16.16.
8 moves, and within this range, the postures of the arms 3 and 6 can be changed and braking is performed.

(Example) Embodiments of the present invention will be described in detail with reference to the drawings.

Figures 1 and 2 show the first embodiment, and Figure 1 shows an exploded perspective view of a bicycle caliper brake device (side-pull type). In the figure, 1 is a fixed shaft fixed to the bicycle side. It has an arm holding part 2 formed in an oval shape in cross section at its front part.

3 is the first arm called the minor arch or figure 7 arch,
A brake shoe 5 is provided at one end via a holder 4.

6 is the second arm called the large arch or 0-shaped arch,
A brake shoe 5 is provided at one end via a holder 4.

The boss portion 7 at the end of the first arm 3 and the boss portion 8 at the midway point of the second arm 6 are each swingably inserted into and supported by the arm holding portion 2 of the fixed shaft l so as to be overlapped with each other. ing. Each of the boss parts 7 and 8 is provided with a recess 9 and 10 around the axis of the fixed shaft 1 on opposing surfaces thereof, and a spring storage chamber 11 is formed by the cough recess 9 and 10.

Reference numerals 12 and 13 denote detent bodies, each of which has a closed cylindrical shape and is fitted into the recess 9.10 of each arm 3.6;
The detent body 12.13 is provided with an oval hole 14 having a cross-sectional shape substantially the same as that of the arm holding portion 2 in its side wall 15.15'.
is externally fitted onto the fixed shaft 1 so as to be relatively unrotatable.

Further, the side wall 15.15' is provided with a spring relief portion 16.16 which is an arc-shaped through hole.

Reference numeral 17 denotes a coil return spring, which is housed in the spring storage chamber 11 and externally fitted onto the fixed shaft l via a bushing 24. Both legs 18.18 of the spring 17 are inserted into the spring relief portions 16.16 of the detent body 12.13, and are inserted and supported by the boss portions 7, 8 of each arm 3, 6. 18.18 is brought into contact with one end of each relief part 16.16 by the elastic force of the spring 17, maintaining the posture of each arm 3.6, and the entire brake device consisting of both arms 3.6 is fixed here. This prevents rotation about the axis l.

19 is a flat washer, which is held between the flange 1 of the fixed shaft 1 and the first arm 3; 20 is a center ring, which is attached to each arm 3,
It is interposed between the boss portions 7 and 8 of 6. A flat washer 21 is held between the flat nut 22 and the second arm 6, and a nand 23 is screwed onto the fixed shaft l via a threaded portion.

In the above configuration, the rotation stopper 12.13 and the fixed shaft 1
The rotation prevention structure is not limited to that of the first embodiment, and in short, any rotation prevention structure may be used as long as the rotation stopper 12, 13 and the fixed shaft 1 cannot rotate relative to each other.

Furthermore, if the spring storage chamber 11 is filled with grease, the spring 17 can be prevented from rusting and a lubrication effect can be obtained during braking.

Is Figure 3 the 3rd one? An example is shown in which a flat washer-shaped detent body 12.13 is used, whereas the first example uses a cylindrical detent body 12.13.

FIG. 4 shows a third embodiment, in which both arms 3 and 6 are sandwiched between detent bodies 12 and 13 made of thick flat washers.

(Effects of the Invention) The present invention provides a recess 9.10 around the axis of the fixed shaft 1 on the facing side of the boss portion 7.8 of the first and second arms 3.6. A spring storage chamber 11 is formed, and the coil return spring 17 is stored in the spring storage chamber 11, so that the spring 17 is protected from the outside and has little chance of being damaged, and is also prevented from getting mud etc. This is prevented, and the function of the spring 17 is fully exhibited. Furthermore, since the spring 17 is built-in, the appearance of the brake device can be simplified, and a good-looking brake device can be provided.

In addition, both legs 18.18 of the coil return spring 17 fitted onto the fixed shaft l are engaged with the boss portions 7 and 8 of each arm 3 and 6, and bias the arms 3.6 in the direction away from each other. Therefore, when braking is performed against the bias of the spring 17, there is no sliding between the return spring and the pin as in the conventional case, and the frictional resistance generated in this sliding part is eliminated, making the braking operation easier. It can be done easily. Additionally, unilateralism and squeaks caused by conventional spring and pin wear are avoided.

Further, a detent body 12.13 corresponding to each boss portion 7, 8, which is immovable relative to the fixed shaft 1, and provided with a spring release portion 16 that determines the swinging range of the arms 3, 6, is provided. Since both legs 18 and 18 of the coil return spring 17 fitted onto the fixed shaft 1 are inserted into the spring release portion 16, the spring 17 is held on the fixed shaft 1 and the axial center of the fixed shaft 1 is Since the brake device cannot rotate around the brake device, the conventionally used spring holder is no longer required, and it is possible to provide a new type of brake device that can obtain the above-mentioned effects without complicating the structure. can.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention, in which FIG. 1 is an exploded perspective view of the brake device, FIG. 2 is a vertical cross-sectional view of the same when assembled, and FIGS. 5 to 7 show a conventional example, FIG. 5 is an overall rear view, and FIGS. 6 and 7 are enlarged explanations of main parts. It is a diagram. 1...Fixed shaft, 3...First arm, 5...Brake shoe, 6...Second arm, 7.8...Boss part, 9
．． 10... recess, 11... spring storage chamber, 12.13
... Rotating body, 16... Spring relief part, 17...
・Coil return spring, 18.18...Both legs.

Claims (1)

[Claims] (1) The boss portions 7 and 8 of the first arm 3 and the second arm 6, which are provided with brake shoes 5 and 5 that come into contact with and separate from the rim of the wheel, are each pivotably supported on the fixed shaft 1, and the arm 3 , 6 are biased in directions away from each other, recesses 9 and 10 are provided around the axis of the fixed shaft 1 on the opposing surfaces of the boss portions 7 and 8 of each of the arms 3 and 6, A spring storage chamber 11 is formed by the recesses 9 and 10, and a coil return spring 17 externally fitted on the fixed shaft 1 is placed inside the spring storage chamber 11.
is housed, and both legs 18, 18 of the spring 17 are engaged with the boss portions 7, 8 of each arm 3, 6, and on the other hand,
The spring relief members 12 and 13 are provided with spring relief portions 16 that correspond to the respective boss portions 7 and 8, are not rotatable relative to the fixed shaft 1, and further determine the swinging range of the arms 3 and 6. A bicycle caliper brake device, characterized in that the caliper brake device is inserted into and engaged with the portion 16.