JPH0356146Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a caliper brake used for bicycles.

(Prior art) Conventionally, as this type of brake, for example,
As described in Publication No. 20329, one end of a brake arm with a brake shoe in the middle is supported freely to rotate on a fixed pedestal that is fixed by welding to the front fork or rear fork of a bicycle frame. A return spring is interposed between the fixed pedestal and the brake arm to bias the brake arm in a direction that increases the distance between the brake shoes, and the brake arm is swung by a pulling operation of an operating wire. It is known that the brakes can be braked by

(Problem to be solved by the invention) However, in this conventional caliper brake, when assembling the brake arm to the fixed pedestal, the return spring is attached, and the brake arm is fixed while giving a preload to the return spring. Since it is necessary to attach the brake arm to the pedestal, it is difficult to apply a preload to the return spring, and it is also difficult to attach the brake arm to the fixing member.

An object of the present invention is to make it possible to easily apply a preload to a return spring and to easily assemble a brake arm to a fixed member.

(Means for Solving the Problems) Therefore, the present invention has a brake arm 3 having a brake shoe 2 and rotatably supported by a fixed member 1, and a combination of the fixed member 1 and the brake arm 3. In a caliper brake equipped with a return spring 4 interposed therebetween to bias the brake arm 3, the brake arm 3 is provided with a boss portion 32.
The return spring 4 whose one end is locked to the brake arm side and the spring receiver 5 which locks the other end of the return spring 4 are supported on the boss portion 32, and these spring receivers 5 and A rotation regulating means for regulating the rotation of the spring receiver 5 with respect to the boss section 32 while applying a preload to the return spring 4 is provided between the spring receiver 5 and the boss section 32. A fixing means is provided for fixing the spring receiver 5 to the fixing member 1 while holding the spring receiver 5 relatively rotationally freely within a certain range. (Function) By attaching the return spring 4 and the spring receiver 5 to the boss portion 32 of the brake arm 3 and rotating the spring receiver 5, a preload can be applied to the return spring 5. This state can be maintained by the rotation regulating means, and the spring receiver 5 can be held on the brake arm 3 by the biasing force of the return spring 4 given this preload. Therefore, when assembling the brake arm 3 to the fixed member 1, there is no need to apply a preload to the return spring 4, making it easy to assemble the brake arm 3. It can be done easily and easily.

(Example) The caliper brake of the first example shown in Figs. 1 to 4 is a cantilever type caliper brake, and its basic structure is attached to the front or rear fork of the frame F of the bicycle. Fixed member 1, 1 consisting of a pair of fixed pedestals fixed by welding
The intermediate portions of a pair of brake arms 3, 3 having brake shoes 2, 2 are supported independently and freely rotatably, and between the respective fixed members 1, 1 and the respective brake arms 3, 3. A pair of return springs 4, 4 are interposed to bias the respective brake arms 3, 3 in a direction in which the distance between the brake shoes 2, 2 is increased, and each of the brakes is Rotate the arms 3, 3 in the direction of arrow X in FIG. 4 against the respective return springs 4, 4,
By loosening the wire W, the brake arms 3, 3 are rotated in the direction of the arrow Y in FIG. 4 by the biasing force of the return springs 4, 4.

Incidentally, since the pair of fixing members 1, 1 and brake arms 3, 3, each of which is fixed separately to the frame F, have the same structure, only one structure will be explained below to simplify the explanation. .

The fixing member 1 consists of a seat body 11 having a mounting surface to the frame F, and a cylindrical shaft 12 protruding outward from an end surface of the seat body 11 opposite to the mounting surface. A screw is provided on the inner peripheral surface of the

Further, the brake arm 3 has a bell crank shape with a bent middle, and a fitting hole 31 that fits into the outer periphery of the cylinder shaft 12 is provided in the middle, and the shoe 2 is attached to one end. Further, a suspension wire A is installed between the other end portions, and the central portion of the suspension wire A is connected to the operation wire W via a carrier B.

The return spring 4 is made of a coil spring, and has a first spring foot 41 and a second spring foot 42 that protrude outward in the axial direction at both ends thereof.

Therefore, in the first embodiment, a cylindrical boss part 32 having a cavity that is continuous with the fitting hole 31 through the enlarged diameter step part is provided in the middle of the brake arm 3. The inner return spring 4 locks the first spring leg 41 in the locking hole 33 provided in the enlarged diameter stepped portion, and the second spring leg 4 of the outer return spring 4.
2 and a spring holder 5 that locks the spring holder 5.
and the boss portion 32, the return spring 4
A rotation regulating means is provided for regulating the rotation of the spring receiver 5 with respect to the boss portion 32 in a state where a preload is applied to the spring receiver. Uke 5
A fixing means for fixing the above-mentioned fixing member 1 is provided.

In the above configuration, the spring receiver 5 is made of a circular plate having a square hole 51 in the center for fitting a tool for rotating the spring receiver 5, as shown in FIG. A locking hole 52 is provided, and the second spring leg 42 is locked in this locking hole 52. Although one locking hole 52 is provided as shown in FIG. 2, a plurality of locking holes 52 may be provided at predetermined intervals in the circumferential direction. In this way, by selecting the locking hole 52 that locks the spring foot 42,
This makes it possible to adjust the preload.

The rotation regulating means includes an engaging protrusion 6 protruding from the outer circumferential surface of the spring receiver 5, and a contact 7 provided on the boss portion 32, facing the engaging protrusion 6 and the spring receiver 5 in the rotational direction. The rotation of the spring receiver 5 is restricted by the engagement of the engagement protrusion 6 with the abutment 7. The engaging protrusion 6 and the abutment 7 may be provided on opposite members, or may be provided in one set instead of two sets as shown in FIG. 2.

Further, the spring receiver 5 can be held in the boss portion 32 by the engagement resistance between the engagement protrusion 6 and the abutment 7, which are engaged by the biasing force of the return spring 4 to which a preload is applied.

The spring feet 41 and 42 of the spring 4 are connected to the respective locking holes 33 and 5 of the brake arm 3 and the spring receiver 5.
2, each of these spring legs 41, 4
2 and each locking hole 33, 52 also prevents the spring receiver 5 from moving in the detachment direction. In FIG. 1, in order to securely hold the spring receiver 5, a cylindrical holder 8 is made up of a large diameter part 81 having an annular flange and a small diameter part 82 continuous to the large diameter part 81 via a stepped part. And this cylindrical holder 8
A stopper 9 is provided to prevent the axially outward movement of the. The holder 8 is attached to the boss portion 3
2 to support the spring receiver 5 on the small diameter portion 82, and also bring the end surface of the small diameter portion 82 into contact with the tip surface of the cylindrical shaft 12.
A locking hole 83 corresponding to the locking hole 52 is provided in the large diameter portion 81 of the , and the second spring foot 42 is locked in the locking hole 83. The spring receiver 5 is prevented from rotating. Further, the stopper 9 is made up of a plurality of protrusions that protrude in the axial direction at predetermined intervals in the circumferential direction from the open end of the boss portion 32, and these protrusions are bent toward the center of the boss portion. The stopper 9 prevents the holder 8 from moving outward in the axial direction, and allows the spring receiver 5 to rotate relative to the boss portion 32.

The outer peripheral surface of the annular flange of the holder 8 is provided with a recess for receiving the protrusion forming the stopper 9. Further, the holder 8 also serves as a cover that covers the end face of the boss portion 32 except for the stopper 9.

Further, the fixing means mainly uses a fixed bolt 10 with a head having a threaded portion screwed into the threaded hole of the cylinder shaft 12, and the head of the bolt 10 is inserted into the large diameter portion of the holder 8. The holder 8 is fixed to the fixing member 11 by being supported in a recess provided in the holder 8 and screwed into the screw hole, thereby preventing the spring receiver 5 from rotating.

The illustrated caliper brake includes the first spring foot 41 of the return spring 4 and the boss portion 3.
2, there is provided a biasing force adjusting means for adjusting the biasing force of each return spring 4 to each brake arm 3.

This adjusting means consists of an adjusting screw 20 as shown in FIG.
and the thrust of the adjustment screw 20 is applied to the first spring foot 41.
The boss portion 32 is provided with a screw hole 34, and the adjustment screw 2 is provided with a screw hole 34.
0 into the screw hole 34, the transmission body 21 is rotatably installed inside the boss portion 32, and the first spring foot 41 is inserted into the insertion hole 21a provided in the transmission body 21, By rotating the adjustment screw 20, the position of the first spring leg 41 relative to the brake arm 3 is changed, and the urging force of the return spring 4 to the brake arm 3 is adjusted. Further, the locking hole 33 is an arcuate long hole as shown in FIG. Note that the adjusting means may be configured such that the transmission body 21 is eliminated and the tip of the adjusting screw 20 is brought into direct contact with the first spring foot 41.

Further, in the figure, 30 is a bush inserted into the outer periphery of the cylindrical shaft 12, and 50 is a cylindrical seal body made of synthetic resin.

In the brake constructed as described above, the mounting surface of the fixing member 1 is fixed to the bicycle frame by welding, and the brake arm 3, return spring 4, and spring receiver 5 are integrated into a unit.

That is, the return spring 4 and the spring receiver 5 are inserted into the boss portion 32 of the brake arm 3, and the first spring foot 41 of the return spring 4 is attached to the brake arm 3.
and the second spring foot 42 into the locking hole 52 of the spring receiver 5, and then fit a tool into the tool fitting square hole 51 of the spring receiver 5. turn the spring receiver 5 with the tool to apply a preload to the return spring 4, and in this state, the engagement protrusion 6 provided on the spring receiver 5 comes into contact with the contact 7 provided on the boss portion 32, and the Boss portion 32 of spring receiver 5
The holder 8 is inserted into the boss portion 32, the spring receiver 5 is supported by the small diameter portion 82 of the holder, and the second spring foot 42 is locked in the locking hole 83. The stopper 9 is bent inward to prevent the holder 8 from moving outward in the axial direction, and the brake arm 3, return spring 4, spring receiver 5, and holder 8 are made into a unit.

To attach the brake arm 3 that has been made into a unit in this manner to the fixing member 1, the fitting hole 31 of the brake arm 3 is inserted into the outer periphery of the cylindrical shaft 12 of the fixing member 1, and the fixing bolt 10 is inserted. This can be done by inserting it into the holder 8 and screwing it into the threaded hole of the cylindrical shaft 12, and by tightening the bolt 10, the holder 8 and the spring receiver 5 held in the holder are attached to the fixed member 1. It is fixed.

Therefore, according to the present invention, it is possible to apply a preload to the return spring 4 with a simple operation of turning the spring receiver 5, so the work of applying this preload is very easy to perform. Since the return spring 4 and the spring holder 5 can be made into a unit with a preload applied to the return spring 4, the brake arm 3 can be assembled to the fixing member 1 by the boss portion 32 of the brake arm 3. It can be assembled by simply inserting it into the fixing member 1 and screwing the fixing bolt 10.

Furthermore, since the return spring 4 is housed inside the cylindrical boss portion 32 of the brake arm 3, it can be protected from dust and rainwater, and a preload can be given to the return spring 4 in advance. Therefore, a return spring with a small spring constant can be used. Also, the adjustment screw 2
0 and brake arm 3 of return spring 4.
By adjusting the urging force on the brake shoe 2, the shoe clearance between the brake shoe 2 and the wheel rim can be easily adjusted to be uniform.

In the embodiment described above, the spring receiver 5 is formed into a disk shape, but the shape of the spring receiver 5 is not particularly limited.

Further, although the engaging protrusion 6 and the abutment 7 are provided as rotation regulating means, the configuration thereof is not limited.

In addition, as a means to securely hold the spring receiver 5 on the boss portion 32, a holder 8 and a stopper 9 are used in FIG.
However, in addition, the holder 8 may be formed integrally with the spring receiver 5 and securely held by the stopper 9, or the holder 8 and the stopper 9 may be omitted, Said spring receiver 5
A blocking portion may be provided on the inner circumferential surface of the boss portion 32 that engages with the engaging projection 6 and prevents the spring receiver 5 from moving outward in the axial direction. Furthermore, a retaining ring may be provided on the inner circumferential surface of the boss portion 32, and its configuration is not particularly limited.

In addition, in the case where the holder 8 is formed integrally with the spring receiver 5 in the above-described configuration, a cap 60 is provided on the outside of the spring receiver 5 as shown in FIG. You can also do this.

Further, in the second embodiment shown in FIG. 5, a fitting protrusion 53 is provided on the outer end surface of the spring receiver 5, and a fitting hole 60a is provided in the cap 60 to fit into the fitting protrusion 53. is provided, and the cap 60
is held in the spring receiver 5, and the cap 6
The sealing material 50 is provided between the inner surface of the outer circumferential portion of the spring holder 5 and the end surface of the boss portion 32, the length of the locking hole 52 provided in the spring receiver 5 is increased, and a locking hole 52 corresponding to the locking hole 52 is provided. The stop hole 60b is inserted into the cap 60.
The second spring foot 4 is provided in the locking hole 60b.
2 is locked.

Preferably, the cap 60 is made of a different material from the spring receiver 5, such as synthetic resin, and is made of a plurality of different colors and shapes so that they can be replaced. In addition, in the case of FIG. 5, the spring receiver 5
In order to securely hold the cap 60 on the boss 32, it is preferable to wrap a wire whose outer periphery is coated with synthetic resin or the like around the boss 32 and the cap 60.

Further, the structure of the fixing means is not particularly limited either.

Further, the caliper brake of the third embodiment shown in Figs.
and C-shaped and Y-shaped brake arms 3, 3 which are rotatably supported on this fixed member 1, and each return spring 4, 4 is interposed between these fixed member 1 and each brake arm 3, 3. The basic difference from the first embodiment shown in Figs. On the other hand, the third
In the embodiment, one fixing member 1 consisting of a pivot shaft having a large diameter portion 1a in the middle is used, and
The other configurations are basically the same. Therefore,
A detailed explanation of the same configuration will be omitted, and only the different points will be explained.

Therefore, the fixing member 1 in the third embodiment
A non-circular portion 1b having a flat surface is provided on the outer periphery of the large-diameter portion 1a on the distal side, and a non-circular portion 1b having a flat surface is provided in the center of the spring receiver 5 instead of the square hole 51. A non-circular fitting hole 54 is provided to fit into the hole. The fitting hole 54, the non-circular portion 1b, and the distal end side threaded portion 1c of the fixing member 1
The fixing means is constituted by a nut 100 that is screwed into the spring receiver 5, and rotation of the spring receiver 5 is prevented by fitting into the non-circular portion 1b of the fitting hole 54.

The brake of the third embodiment configured as above is as follows:
As in the case of the first embodiment, each brake arm 3, each return spring 4, and each spring receiver 5 are made into a unit by applying a preload to each return spring 4, and each brake arm 3 formed into a unit is The fitting hole 31 of and the fitting hole 54 of each spring receiver 5 are inserted into the non-circular portion 1b of the fixing member 1 to prevent rotation of each spring receiver 5 with respect to the fixing member 1, and
Each brake arm 3 is rotatable relative to the fixed member 1, and the nut 100 is attached to the threaded portion 1 of the fixed member 1.
By screwing the brake arms 3 into the fixing member 1, each brake arm 3 is prevented from moving in the axial direction with respect to the fixed member 1.

Therefore, in the case of the third embodiment, as in the first embodiment, preload can be applied to the return spring 4 by a simple operation of turning the spring receiver 5, so the work of applying this preload is very easy. Moreover, the brake arm 3, the return spring 4, and the spring receiver 5 can be connected to the return spring 4.
Since the unit can be assembled with a preload applied to the brake arm 3, the brake arm 3 is assembled to the fixed member 1 by inserting the boss portion 32 of the brake arm 3 into the fixed member 1 and screwing the nut 100. It can be assembled with just a few simple steps.

Furthermore, by applying a preload to the return spring 4,
The configuration that allows the brake spring and the return spring to be made into a unit is preferably applied to both brake arm 3 sides, as in the first to third embodiments, but it is preferable to apply it to both brake arm 3 sides. It may be applied only to

(Effect of the invention) As described above, according to the invention, the return spring 4 is attached to the boss portion 32 of the brake arm 3, a preload is given to the return spring 4 in advance, and the brake arm 3 and each return spring 4 are Each brake arm 3 is attached to the fixing member 1 in the unit state.
Brake arm 3
can be easily and effortlessly assembled to the fixed member 1. Moreover, the spring receiver 5 that locks the end brake arm of the return spring 4 is attached to the boss portion 32, and the spring receiver 5 is attached to the boss portion 32. Since it is possible to apply a preload to the return spring 4 by turning the return spring 4, the work of applying this preload can be performed easily and easily. Therefore, as a whole, the efficiency of assembling the brake arm 3 to the fixing member 1 can be improved, and costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of only the main parts showing an embodiment of the brake of the present invention, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is a sectional view taken along the line of Fig. 1, and Fig. 4 is the whole. , FIG. 5 is an enlarged sectional view of only the main parts showing another embodiment, and FIGS. 6 to 9 show still another embodiment, and FIG. 6 is an enlarged sectional view of only the main parts. figure,
Figure 7 is a sectional view corresponding to Figure 2, and Figure 8 is a cross-sectional view corresponding to Figure 3.
A sectional view corresponding to the figure, and FIG. 9 is a front view of the whole. 1...Fixing member, 2...Brake shoe, 3...
...Brake arm, 32...Boss part, 4...Return spring, 5...Spring holder.

Claims (1)

[Scope of utility model registration request] a brake arm 3 having a brake shoe 2 and rotatably supported by a fixed member 1; and a return spring 4 interposed between the fixed member 1 and the brake arm 3 to bias the brake arm 3. In the caliper brake, the brake arm 3 is provided with a boss portion 32, and the boss portion 32
The return spring 4 that locks one end to the brake arm side and the spring receiver 5 that locks the other end of the return spring 4 are supported, and between these spring receivers 5 and the boss portion 32, A rotation regulating means for regulating the rotation of the spring receiver 5 with respect to the boss portion 32 with a preload applied to the return spring 4 is provided, and the spring receiver 5 is held in the boss portion 32 so as to be free to rotate within a certain range. On the other hand, a caliper brake characterized in that a fixing means for fixing the spring receiver 5 to the fixing member 1 is provided.