JPS6231348Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a caliper brake for bicycles.
In particular, we are improving the device that maintains equal play between the left and right brake shoes and the rim, making it easier to obtain the desired rotation prevention force that prevents the setting plate from rotating, and simplifying the structure. To make it easier to assemble a caliper brake, and to manufacture the caliper brake at low cost.

For bicycle caliper brakes, Jikaisho
There is something shown in Publication No. 54-166653, which says,
First and second brake arms having a brake shoe at the lower end are rotatably fitted to a center bolt that is inserted and fixed into the bicycle frame, and the lower end of each brake arm is attached to a center bolt that is inserted into and fixed to the bicycle frame. The left and right sides are equipped with brake shoes that move toward and away from each other, and a setting plate is fitted between both brake arms of the center bolt. A balance arm is interposed to maintain equal play with the rim, and each end of the balance arm is provided with an end engagement part that is rotatably engaged with each brake arm. Some bicycle parts are equipped with a central engaging part that is rotatably engaged with the setting plate. According to this, the play between the left and right brake shoes and the bicycle rim can be maintained evenly, and the brake During operation, both brake arms can be rotated equally, allowing good braking to be performed by the left and right brake shoes.If the caliper brake swings around the center bolt for some reason, the brake arm can be rotated evenly, and if the caliper brake swings around the center bolt for some reason, the brake arm can be rotated evenly. This has the advantage that the play between the left and right brake shoes and the bicycle rim can be automatically returned to an equal level.

However, in the above conventional systems, the center bolt is press-fitted into the setting plate or a spring is used to generate a rotation preventing force that prevents the setting plate from freely rotating. In the case where the anti-rotation force is generated by press-fitting as described above, the problem is that the caliper brake cannot be easily assembled and it is difficult to generate the desired anti-rotation force. It was hot. Further, in the case where the rotation preventing force is generated by a spring, since the spring is expensive, there is a drawback that the manufacturing cost of the caliper brake increases.

The present invention has solved the above problem, and its characteristics are that a hollow shaft is fitted and fixed to a center bolt that is inserted and fixed into a bicycle frame, and that the shaft has a brake shaft at its lower end. 1. Fit the second brake arm rotatably, fit the boss part of the setting plate between both brake arms of the shaft, and rotate them relative to each other between both brake arms and the setting plate. A balance arm is installed to maintain equal play between the left and right brake shoes and the bicycle rim, and each end of the balance arm has a pair of end engagement parts that are rotatably engaged with each brake arm. The center of the balance arm has a center engagement part that is rotatably engaged with the setting plate, and a nut screwed to the front side of the bicycle frame on the shaft allows the setting plate to be engaged with the setting plate. The present invention is characterized in that it includes means for generating a rotation preventing force that prevents rotation of the setting plate relative to the shaft by tightening the boss portion in the axial direction.

Hereinafter, a first embodiment in which the present invention is applied to a side bull type caliper brake will be explained based on the drawings of FIGS. The rear part is inserted. A pair of R washers 3 and 4 that hold the fork 1 in a shape are fitted to the center bolt 2, and a flat washer 5 and an intervening body (the front wheel 7 mudguard mounting member, etc.) 6 is fitted, and a mounting nut 8 is attached to the rear end.
The caliper brake is removably attached to the hawk 1 by being removably screwed onto the hawk 1.

The center bolt 2 has a truncated conical head 2a, and a hexagonal hole 2b is formed in the head 2a, and the head 2a of the center bolt 2 and the front R washer 3
A hollow shaft 9 is removably fitted in between. The shaft 9 has a flange 9a that comes into contact with the head 2a, and on the base side of the shaft 9, the flange 9a is connected to a tapered part 9b whose outer peripheral surface is tapered toward the tip. It is formed.
The shaft 9 is clamped and fixed by the head 2a of the center bolt 2 and the front R washer 3 by fastening the mounting nut 8.

Reference numeral 10 denotes a setting plate, which is composed of a boss portion 11 and a main body 12. The boss portion 11 is removably fitted onto the base side of the shaft 9, and has a tapered portion 11a on the inner circumferential surface of one end that is tapered toward the other end. is engaged with the tapered portion 9b of the shaft 9. The base side of the main body 12 is bifurcated, and is externally fitted and fixed to the rear end of the boss portion 11, and a first engagement hole 13 is formed in the distal end of the main body 12.

14 is a C-shaped first brake arm, and the setting plate 1 is attached at the upper part, which is the middle part in the longitudinal direction.
It is rotatably fitted into the boss portion 11 of 0.

Reference numeral 15 denotes a Y-shaped second brake arm, the upper end of which is rotatably fitted on the rear side of the setting plate 10 of the shaft 9;
A setting plate 10 is interposed between both brake arms 14 and 15.

A front fixing nut 16 is removably screwed to a portion of the shaft 9 on the rear side of the second brake arm 15, so that both brake arms 1
4, 15 and the setting plate 10 are clamped between the front fixing nut 16 and the flange 9a of the shaft 9, and are prevented from moving in the direction of the shaft axis. The tapered part 11a of the setting plate 10 bites into the tapered part 9b of the setting plate 10, and both the tapered parts 9b,
11a generates a rotation prevention force that prevents the setting plate 10 from rotating around the shaft 9. This rotation prevention force can be adjusted to a desired value by adjusting the fastening force of the front fixing nut 16. It can be adjusted freely.

Further, a rear fixing nut 17 is removably screwed onto the rear end of the shaft 9, and between the fixing nuts 16 and 17 of the shaft 9 is a spring that biases both the brake arms 14 and 15 in the closing direction. machine 18 is fitted. 19-25 are flat washers or shims.

Brake shoes 26 and 27 are detachably provided at the lower end of each brake arm 14 and 15, and can be moved toward and away from the left and right sides of the rim 28 of the front wheel 7 by swinging the brake arms 14 and 15.

Further, an adjustment bolt 31 for receiving the outer 30 of the Bowden wire 29 is provided at the upper end on the outer end side of the second brake arm 15, and an adjustment bolt 31 for receiving the outer 30 of the Bowden wire 29 is provided at the end of the first brake arm 14. is detachably attached with bolts 33.

In each brake arm 14, 15, a second engagement hole 3 having a circular cross section and a blind hole shape is provided in a portion facing the first engagement hole 13 of the setting plate 10.
4 and 35 are formed, respectively. Each second engagement hole 3
4 and 35 consist of small diameter parts 34a and 35a on the bottom side and large diameter parts 34b and 35b on the opening side.

36 is a balance arm, both brake arms 1
4, 15 and the setting plate 10, a pair of end engaging parts 36a are spherically expanded at both ends, and a central engaging part 36a is spherically expanded at the center. 36b, and a pair of round shaft-shaped connecting shafts 36c that connect the end engaging portion 36a and the central engaging portion 36b, each end engaging portion 36a is connected to the second engaging hole 34, 35. Small diameter portions 34a, 35a
The central engaging portions 36b are rotatably and removably inserted into and engaged with the first engaging holes 13, respectively.

According to the embodiment configured as described above, when the caliper brake is properly attached to the fork 1, the left and right brake shoes 2 are arranged as shown in FIG.
6, 27 and the rim 28 are equal, and the balance arm 36 and both brake arms 14, 15
The relative positional relationship with the setting plate 10 is as shown in FIG.

Now, when the brake lever (not shown) of the bicycle is operated to perform a brake operation, both brake arms 14 and 15 are rotated in opposite directions around the shaft 9 by the Bowden wire 29, and the left and right brake arms are rotated in opposite directions. 26 and 27 press against both sides of the rim 28 to brake the front wheel 7.

In this case, each engaging portion 36a, 36b of the balance arm 36 is connected to both brake arms 14, 1.
5 and the setting plate 10, the balance arm 36 and both brake arms 1
4, 15 and the setting plate 10 as shown in FIG. Since the center engaging portion 36b is located in the center between
Each brake arm 14, 15 rotates in opposite directions relative to the setting plate 10 by the same amount. Therefore, the left and right brake arms 14,1
5 rotates evenly, and the left and right brake shoes 26,
27 allows for better braking. Moreover, when the brake release operation is performed next, the ammunition 18
Due to the elastic force, each member returns to its original position by an operation opposite to that described above.

Also, if for some reason the caliper brake rotates around the center bolt 2 when the brake is released, the play between the left and right brake shoes 26, 27 and the rim 28 will no longer be equal, as shown in Figure 3. In this case, when the caliper brake is operated, both the brake arms 14, 15 and the setting plate 10 rotate in the same manner as described above, and the left and right brake shoes 26, 2
7 hits the rim 28 partially.

After the partial contact, the brake arm 14 on the side making the partial contact does not rotate, only the brake arm 15 on the other side rotates, and the brake shoe 27 of the brake arm 15 contacts the rim 28. do.

In this case, the balance arm 36 rotates in the direction of rotation of the brake arm 15 on the other side, using the end engaging portion 36a that is engaged with the brake arm 14 on the side that is in partial contact as a fulcrum. , 6th
As shown by the imaginary line in the figure, the setting plate 10 is rotated around the shaft 9 by half the amount of rotation of the brake arm 15 by the balance arm 36, overcoming the rotation prevention force.

Then, when the caliper brake is released, both brake arms 14 and 15 are rotated in the releasing direction due to the elastic force of the bullet 18, but the setting plate 10 is moved as shown in FIG. The balance arm 36 does not rotate from the position shown by the imaginary line, but instead rotates around the central engaging portion 36b.The brake arms 14 and 15 rotate by the same amount in opposite directions, and the left and right brakes are rotated by the same amount. The clearances between 26, 27 and the rim 28 are equal.

FIG. 8 shows a second embodiment of the present invention, in which neither the shaft 9 nor the boss portion 11 of the setting plate 10 has a tapered portion. A washer 37 having knurling on both the front and back surfaces is removably fitted to the shaft 9 and interposed between the flange 9a of the shaft 9 and the end face of the boss 11.

FIG. 9 shows a third embodiment of the present invention, in which a pair of flanged nylon bushes 38 are removably interposed between both ends of the boss portion 11 of the setting plate 10 and the shaft 9. , each button 38
A flange portion 38a is interposed between the flange portion 9a of the shaft 9 and the end surface of the boss portion 11, or between the end surface of the boss portion 11 and the flat washer 22.

FIG. 10 shows a fourth embodiment of the present invention.
A pressing nut 38 is removably screwed to the tip side of the boss portion 11 of the shaft 9.
The boss portion 11 is shaped like a clamp between the shaft 9 and the flange portion 9a of the shaft 9.

As described in detail above, the present invention is capable of controlling the rotation of the setting plate relative to the shaft by tightening the boss portion of the setting plate in the axial direction using a nut screwed to the front side of the bicycle frame on the shaft. Since the device is equipped with a means for generating a rotation prevention force that prevents rotation, the desired rotation prevention force can be easily obtained by the tightening force of the nut, and the structure is simple, making it easy to assemble the caliper brake. This is easy to do, and since expensive springs and the like are not used, caliper brakes can be produced at low cost. The present invention has the various advantages mentioned above and is of great practical benefit.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the present invention,
Fig. 1 is a front view, Fig. 2 is a plan view, Fig. 3 is a front view showing the state in which the caliper brake is rotated around the center bolt, Fig. 4 is a plan sectional view of the main parts,
Figure 5 is an exploded perspective view, Figure 6 is A-A of Figure 4.
7 is a longitudinal sectional view showing an operating state different from that in FIG. 6, and each of FIGS. 8 to 10 is a main view showing each of the second to fourth embodiments of the present invention. FIG. 1... Hawk, 2... Center bolt, 7...
Front wheel, 9...Shaft, 10...Setting plate, 11...Boss portion, 12...Main body, 14,
15...first and second brake arms, 16, 17
...Front/rear fixing nuts, 26, 27...Brake shoe, 28...Rim, 36...Balance arm, 36a, 36b...End/center engaging portion, 3
7...Washer, 38...Nylon bushing, 39...
...Push nut.

Claims (1)

[Scope of utility model registration request] A hollow shaft is fitted and fixed to a center bolt that is inserted and fixed into a bicycle frame, and a
First and second brake arms having a brake shoe at their lower ends are rotatably fitted together, a boss part of a setting plate is fitted between both brake arms of the shaft, and between both brake arms and the setting plate, A balance arm is installed to maintain equal play between the left and right brake shoes and the bicycle rim by rotating these in relation to each other, and a pair of balance arms are provided at each end of the balance arm, which are rotatably engaged with each brake arm. The center part of the balance arm is provided with a central part engaging part that is rotatably engaged with the setting plate, and is screwed to the front side of the bicycle frame in the shaft. A caliper brake for a bicycle, characterized in that the bicycle caliper brake is equipped with means for generating a rotation preventing force for preventing rotation of the setting plate relative to the shaft by tightening the boss portion of the setting plate in the axial direction using a nut.