JPS6030854B2 - Side-pull type caliper brake device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bicycle caliper brake device, and more specifically, it is of the side bull type, and is equipped with a posture correction means that ensures that a pair of left and right brake shoes and a rim always have an appropriate value during braking. The present invention also relates to the provision of a new brake device which is improved so as to be able to perform a braking action at the same time even if there is an imbalance in the operation transmission force that is unavoidable with Bowden cables.

A pair of brake arms equipped with brake shoes attached to the rim of the wheel are attached to, for example, the shoulders of the handlebar post and supported by bolts, and a brake spring is provided that biases each arch in a direction away from each other, and the handlebar is equipped with the brake arm. A bicycle caliper brake device in which the operating force of a brake lever is transmitted from one side through a Bowden cable against a brake spring is known as a so-called side-pull type brake device. By the way, in this type of brake device, the relative positional relationship with the brake arm must be temporarily changed due to wear of the brake shoes or tire puncture, and then the brake spring holder must be mounted on the bolt. This is extremely difficult as it is fixed in place, requiring many years of experience and advanced technology, and its replacement is also a very troublesome task. In particular, when a tire puncture occurs on a competition bicycle, it is necessary to replace the tire as soon as possible, but if the rim and brake shoe are not properly centered after the tire is replaced, a serious accident can occur. I will humbly express this.

Therefore, if the brake spring holder is arranged so that it can rotate freely around a fixed axis, the brake spring itself can rotate independently without being restrained, and this can be done by operating the brake operating means in the braking direction. However, even with such a configuration, it becomes essentially meaningless if the operational transmission force of the Bowden cable consisting of the inner wire and the outer wire becomes unbalanced.

Now, if we assume that the outer wire transmits the operation transmission force more strongly than the inner wire, the second arm corresponding to the outer wire will brake unilaterally, and the brake spring will control this. Since the other first arm is not supported as much as possible, the other first arm will remain on the other side, which may cause one brake shoe to go to one side or cause trouble in driving, and also make it difficult to center each brake arm.

The inventors have found that this tendency is particularly problematic in bicycle rear wheel brake applications where the Bowden cable must connect the brake lever to the braking means through a bent portion. In view of the above-mentioned circumstances, this invention automatically guarantees proper centering by operating the brake lever in the braking direction even if the centering of the rim and brake shoes is not proper, and also ensures that the centering is fine. The purpose is to provide a brake device that also promises adjustment. In addition, since this invention automatically corrects the centering of the rim and brake shoes by operating the brake lever in the braking direction, assembly and disassembly work is relatively rough, and moreover, quick tire changes are guaranteed. The purpose is to provide a brake device with

Furthermore, another useful object of the present invention is to ensure automatic and proper centering and fine adjustment even when the Bowden cable is bent and connected and the transmission forces between the inner wire and the outer wire are unbalanced. The purpose is to provide the promised equipment. Another object of the present invention is to eliminate damage to the brake arm by applying the adjusting force of the adjuster to the brake spring instead of the brake arm when finely adjusting the centering of the brake shoe.
Another object of the present invention is to provide a brake device that can adjust the misoperation of a brake spring. In order to achieve such an object, the present inventor maintains a first arm and a second arm each having a brake shoe attached to the rim of a wheel in a swinging position around a fixed axis, and Each arm is equipped with a brake spring that urges them away from each other, and an outer wire is connected to one of the arms, and an inner wire is connected to the other arm, and the mantle is relatively rotatable around the center of the fixed shaft. The arch center portion of the brake spring having an arch shape is held in the spring holder, and both arch ends of the brake spring are respectively engaged with the first arm and the second arm to bias the arms in a direction away from each other. In the side-pull type caliper flake device, the fixed shaft is provided with an adjustment tool holder having a vertical guide portion that penetrates in the front-rear direction and is unrotatable about the center of the chick, and the guide portion is provided with a member that engages with the flake spring. Adjustment odor having a screw hole that is fitted together and penetrates in the vertical direction is inserted through the adjustment odor so as to be movable in the vertical direction and immovable in the front and back direction,
A side-pull type caliper brake device characterized in that a holding body is provided with an adjuster that is screwed into a screw hole of an adjustment shaft so as to be freely retractable and rotatable about a vertical axis, but not movable in the vertical direction. The development was successful.

1 to 3, reference numeral 1 denotes a first brake arm called a small arch or Y-shaped arch, and has a brake shoe 3 at one end thereof via a holder 2. 4 is a second brake arm called a large arch or C-shaped arch, and has a brake shoe 6 at one end thereof via a holder 5.

The other end of the first brake arm and the middle of the second brake arm 4 are overlapped with each other and held by a fixed ball 7 for attaching the brake device to the vehicle body, and are swingable around the center of the shaft 7. , this blade, each brake shoe 3, 6
is arranged to correspond to the rim 8' of the wheel.

The brake shoes 3 and 6 are blocks made of wear-resistant rubber, and can be adjusted in the radial direction of the wheel by loosening bolts 9 within the guide hole 10 shown in FIG. In addition, the first brake arm has an overhanging arm 11 in the middle.
A connector 13 for screwing the outer holder 12 is attached to the tip of the arm 11.

The outer holder 12 is a cylindrical shaft and is mated to the connector 3, and 14 is a screw adjustment body that is attached to the holder 12.

Further, a connector 5 for an inner wire is attached to the other end of the second brake arm 4. Outer wire 1
6 and an inner wire 17
Eight outer wires 16 are attached to the outer holder 12, and the inner wires 17 are inserted into the outer holder 12 and connected with the connector 5.

Reference numeral 19 denotes a brake spring, which has an arch-like overall shape, and has a pair of winding parts 20 on both shoulders of the arch to promote elasticity.

Reference numeral 21 denotes a spring holder, which is cylindrical in shape and has a radial holding portion 22, and is encased around the fixed shaft 7 so as to be relatively rotatable around its axis.

As shown in FIG.
3 on the fixed shaft 7, and the holding body 21 is placed on the bearing body 23 to reduce the rotational frictional force of the holding body 21. The arch center portion of the brake spring 19 is engaged with the holding portion 22 of the holding body 21, and each arch end portion 19a, 19b of the spring 19 extends symmetrically with respect to the fixed axis 7, and the first
Protrusions 24 formed on the back surfaces of the arm and the second arm 4,
25 from the inside, and insert the brake shoe 3 here.
, 6 are urged in directions away from each other. Reference numeral 26 denotes fine adjustment means, one end of which is inserted and engaged with an adjustment tool holder 27 having a guide portion 28 immovably provided around the center of the fixed shaft 7, and preferably with a winding portion 20 of the brake spring 19;
It consists of an adjustment element 29 having a screw hole 30 whose other end is engaged with the guide part 28, and an adjuster 31 which is screwed into the three screw holes of the adjustment tool 29 and supported by the holder 27. The body 27 has an annular attachment portion 27a that is attached to the large portion 7 of the fixed shaft 7.
It is overlapped with the rear end surface of a and is encircled by the fixed shaft 7, making it immovable in relation to its centerpiece. The insertion hole 33 of the portion 27a is fixed to a so-called oval hole as shown in FIGS. 4 and 5.

In this position, the rising portion 27b of the holding body 27 is made to project laterally, and the upper side of the rising portion 27b is bent to form a supporting piece 27c. And guide part 2
8 is formed vertically through the rising portion 27b in the front-rear direction, and a notch 34 is provided in the supporting piece 27c. The shaft portion 29a of the adjustment tool 29 is engaged with the guide portion 28 and the collar body 35 is caulked to prevent it from coming out, so that it is movable in the vertical direction but cannot be moved in the front and back direction, and the adjustment tool 29 is prevented from coming out. A curved plane 29c is formed on the upper surface of the main body of the brake spring 29, and another ball portion 29b is engaged with the two winding portions of the brake spring.

The adjuster 31 is connected to the end face of the cap-shaped grip 31a and the collar body 31b.
Insert the abutment piece 27c between the notches 3 and 3.
4, and is rotatable around the vertical axis but immovable in the vertical direction, and its screw shaft 31c is fitted into the screw hole 30' of the adjuster 29. When the grip 31a of the adjuster 31 is manually rotated in the forward and reverse directions, the adjuster 29 is threaded within the guide portion 28, and the spring force of the brake spring 19 is appropriately finely adjusted. Additionally, in the figure, a washer 36 is interposed between the brake holding body 21 and the bolt flap portion 7a.

A friction washer 37 is made of nylon 6 resin or the like and is interposed between the base of the first arm and the spring holder 21.

A washer 38 is interposed between the overlapping portion of the first arm and the second arm 4.

Reference numeral 39 denotes a threaded assembly consisting of two washers and two nuts, which is threaded onto the threaded portion 7b of the fixed shaft 7.

A pair of holders 40 hold the rear fork when the rear brake is applied as shown in FIG. 3, and the front fork when the front brake is used as shown in FIG. By screwing together, the fixed shaft 7 is attached to the vehicle body.

In the above configuration, the braking distance L between the brake shoes 3, 6 and the rim 8 is normally considered to be approximately 2 m/L, but as shown in the solid line position in Fig. 7, each brake shoe 3, 6 and the rim 8 are If the assembly position is such that there is a difference in the spacing between the rims 8 and 8, when the inner wire 17 of the Bowden cable 18 is pulled into the braking position, the one with the smaller spacing will naturally come into contact with the rim 8 first. , here an undesirable one-sided brake is applied.

In such a case, in the present invention, the inner wire 17 is
In other words, even if there is a difference in the spacing between the shoes 3 and 6, if the shoes 3 and 6 are pulled strongly until they come into contact with the rim 8, and then the pulling force is released, the brake spring holder 21 will move to the fixed shaft 7.
The rim 8
After making contact with the rim 8, the shoes 3 and 6 are separated from each other only during the same period, and the brake device is properly oriented with respect to the rim 8 as shown by the chain line in FIG. At this time, if the Bowden cable 18 has a curved path 18a,
The outer wire 16 tends to transmit the operation transmission force more strongly than the inner wire 17, and the outer wire 16
Based on the fact that the first arm corresponding to the first arm 4 is unilaterally braked and the brake spring 19 is not supported to control this, the second arm 4 remains the winner.
Even if the brake is operated in the braking direction and then released, proper centering may not be guaranteed.

Furthermore, if the transmission force of the inner wire 17 is large and the transmission force of the outer wire 16 is small, the opposite may occur and proper arrow centering may not be possible. In such a case, since the adjustment margin for centering is minute, it is necessary to make the adjustment finely by a separate means. In such a case, in the present invention, when the grip 31a of the adjuster 31 is rotated in the forward or reverse direction around its axis, since the screw shaft 31c is screwed into the adjuster 29, the adjuster 29 can be rotated in either the forward or reverse direction. Since it is subjected to the feeding action and the adjustment smell 29 is engaged with the brake spring 19, the screw feeding force of the adjuster 31 is transmitted to the brake spring 19, and fine adjustment is performed.

Further, this fine adjustment can also be carried out by providing a pair of left and right adjusters 31 and applying screw feeding force to each arm 1, 4.
This will not only cause damage to the arms 1 and 4, but also make it impossible to correct the unevenness of the brake spring 19 itself. However, as described above, it is possible to cause the screw feed of the adjuster 31 to act on the brake spring 19 itself via the adjustment smell 29. by arm 1,4
There is no damage to the spring 19, and any looseness in the spring 19 can be corrected. The present invention is as described above, and the intended purpose can be effectively and reliably achieved.

In particular, in the present invention, the holder is formed with a vertical guide portion penetrating in the front-rear direction, and the adjustment tool is inserted into the guide portion so as to be movable in the vertical direction but not movable in the front-rear direction. The adjustment tool can be reliably guided by the guide part without wobbling, and the centering of the brake shoe can be easily and reliably fine-tuned.Even when the brake device is tied, the holder, adjustment handle, and adjuster allow for fine adjustment. When assembled, the adjustment tool etc. will not rotate or wobble, making assembly easy. It is very profitable.

[Brief explanation of the drawing]

FIG. 1 is a rear view of an example of a brake device according to the present invention, and FIG.
The figure is a side view, Figure 3 is a plan view when the device is attached to the rear fork, Figure 4 is a perspective view of the fine adjustment means, Figure 5 is an exploded perspective view,
FIG. 6 is a sectional view of the main parts installed on the front fork, and FIG. 7 is a rear view showing the corrected state. 1 """ younger brother MI brake arm, 4... Brake arm, 3, 6... Brake shoe, 7... Fixed ball, 8
... Rim, 16 ... Outer wire, 17 ... Inner wire, 18 ... Bowden cable, 19 ... Brake spring, 20 ... Winding part, 21 ... Brake spring holder, 26 ... ...Fine adjustment means, 27...
・Adjustment tool holder, 28...Guide part, 29...
...Adjustment tool, 30...Screw part, 31...Adjuster, 31c...Adjustment screw part. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 7 Figure 5

Claims (1)

[Scope of Claims] 1. A first arm and a second arm each having a brake shoe that approaches and separates from the rim of a wheel are held swingably around a fixed axis, and each arm is biased in a direction away from each other. An outer wire is connected to one of the arms, an inner wire is connected to the other arm, and the spring holder is fitted in a spring holder so as to be relatively rotatable around the axis of a fixed shaft. In a side-pull type caliper brake device in which the central part of the arch of a brake spring is held, and both ends of the arch of the brake spring are respectively engaged with a first arm and a second arm to urge each arm in a direction away from each other, a fixed shaft An adjuster holder having a vertical guide portion penetrating in the front-rear direction is provided so as to be unrotatable about the axis, and the guide portion has a screw hole that is engaged with the brake spring and penetrating in the vertical direction. The adjustment tool is inserted through the holder so as to be movable in the vertical direction and not moveable in the front and back direction, and the adjuster is screwed into the holder so that it can move forward and backward into the screw hole of the adjustment tool, and is rotatable around the vertical axis and can be moved up and down. A side-pull type caliper brake device that is immovable in any direction. 2. The side-pull type caliper brake according to claim 1, wherein the brake spring has a winding part on both shoulders of the arch, and an adjustment tool is engaged with one of the winding parts. Device.