JPS5926108Y2 - Tire guide device in caliper brake - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tire guide device in a caliper brake.

Conventional bicycle caliper brakes are roughly divided into center-pull type and side-pull type, and both have brake shoes facing each other at each end of an expandable arch, and the brake shoes are arranged so that they are separated from each other. It is well known that a spring is used to constantly spring the ball in the expanding direction.

By the way, in recent years, with the spread of bicycles that can be easily assembled and disassembled for easy carrying, the arch can be easily reduced with a small gripping force before the Bowden cable is connected to the caliper brake, and the brake can be incorporated when the cable is connected. There is a need for a device that can easily adjust the brake by adjusting the distance between the brake shoe and the bicycle rim.

In addition to assembling portable bicycles, especially on competition bicycles, when changing tires due to bursts or other causes, the tires may hit the brake shoes and quickly insert between the arches, making it difficult to race for time. For racing, there is a demand for guides for inserting tires.

Regarding this point, the applicant of the present application has submitted the following documents:
No. 896 (Utility Model Application No. 135,640/1989), we have already proposed a caliper brake in which a reducing grip member is attached to each end of an arch by co-tightening with a brake shoe.

However, since this reducing grip member is formed of a metal plate separately from the brake device, it not only increases the cost due to an increase in the number of parts, but also requires the hassle of attaching it to the arch by tightening it together with the brake shoe when assembling the brake device. In particular, there is the inconvenience that the gripping member must be removed and reattached every time the brake shoe, which is a consumable part, is replaced.

Furthermore, when the arch is contracted by gripping the gripping member, the elasticity of the spring that expands the arch is so strong that the gripping member bends and deforms from the part where it is attached to the arch, making it difficult to achieve the desired purpose. There is an unavoidable disadvantage.

In view of the above, the present invention is easy to manufacture and is advantageous in terms of the number of parts.Moreover, the arch can be reduced reliably and easily, making it convenient to adjust the brake, and it is always suitable because there is no bending deformation when reducing the arch. It is an object of the present invention to provide a device that can function as a tire guide and is therefore extremely convenient for replacing and installing tires.

Therefore, its characteristic feature is that brake shoes are provided facing each other at each end of an arch that can be expanded and contracted, and that the arch is constantly elasticized by a spring in the expansion direction so that the brake shoes separate from each other. In a caliper brake, the spring is continuously extended downward from the back of the brake shoe surface, the extended portion is bent from below the brake shoe near the shoe surface, and is further bent back from near the shoe surface so that the spring extends downward from the back of the brake shoe surface. It is located at a point where a tire guide is bent downwardly in the direction of the back of the shoe surface.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the device according to the present invention will be described in detail below with reference to the drawings. In FIGS. 1 to 3, a center-pull type caliper brake is illustrated as the caliper brake.

This brake consists of a pair of large arches la, lb and a small arch 2, and each large arch la, lb has an arm part 3 that overlaps each other horizontally, and a circular arc hanging from the arm part 3. It has a flat shoe mounting part 5 that is flush with the leg part 4 at the lower end thereof, and a shoe mounting hole 6 that is elongated in the vertical direction is formed in the mounting part 5. The pair of large arches la and lb are formed approximately symmetrically.

The small arch 2 is overlapped from behind with the overlapping arm portion 3 of the pair of large arches la, lb, and has a recess 7 in the front wall, and both ends of the small arch 2 are connected to the arcuate bent portions of the large arches la, lb. A boss 8.8 is formed on the front surface of the extended end, and the large arches la, lb
A boss 9 formed at an arcuate bent portion is pivotally attached to the boss 8 via a bolt 10 and a nut 11.

There are nipples 12 at the ends of the arm parts 3 of the large arches la and lb.
are inserted into each nipple, and both ends of a wire 13 are fixed to both nipples 12.12. When this wire 13 is pulled upward, the large arches la and lb are mutually connected with the pivot pole 10.10 as a fulcrum. The legs 4 are rotated to reduce their size.

This l pair of large arches la. 1b is always urged by a spring 14 to spread the legs 4, 4 apart from each other, and brake shoes 15 and 15 are attached to the shoe attachment portion 5.5 so as to face each other.

As shown in FIG. 4, the brake shoe 15 has a shoe 17 supporting a brake rubber 16, and a shoe shaft 18 fixed to the back of the shoe 17. and are formed in an arc shape to fit along the rim of the wheel.

This is because the brake rubber 16 is made thin to reduce weight, but the rubber 16 is made long to secure enough shoe surface...This long rubber 16 is ensured to be in close contact with the rim. Therefore, it was made into an arc shape.

In this brake shoe 15, a shoe shaft 18 is inserted into a head 20 of a mounting bolt 19, and the mounting bolt 19 is fixed in a mounting hole 6 of a shoe mounting portion 5.

As shown in FIGS. 5 to 7, the mounting bolt 19 has a head portion 20, a neck portion 21, and a bolt portion 22 having a male thread.
The neck portion 21 is inserted into the shoe attachment hole 6 through the washer 23, and a collar 25 and a washer 26, which are provided with flanges 24 and 24 at both ends, are sequentially inserted onto the inserted bolt portion 22. At the same time, a nut 27 is screwed on.

Accordingly, by tightening the nut 27, the head 20 of the mounting pole I.19 presses the shoe shaft 18 against the washer 23 of the shoe mounting portion 5, and thereby the brake shoe 15 is mounted on the shoe mounting portion 5.

The neck portion 21 of the mounting bolt 19 has a flat surface 28.2 by cutting off both sides in the diametrical direction in the direction in which the shoe shaft 18 is inserted.
8, and when the neck portion 21 is inserted into the mounting hole 6, the flat surface 28 has a slight gap S with both side edges of the mounting hole 6, and this gap S allows the mounting bolt 19 to be attached to the mounting hole 6. It is designed so that it can be rotated by about 5 degrees.

The spring 14 is cut from a single piece of steel wire, and the small arch 2
A base portion 29 along the upper edge of the recess 7, and a coil portion 30.30 wound at both ends of the base portion 29.
An extension part 31 is continuously provided extending downward from the back of the shoe surface of each brake shoe 15, and this extension part 31 abuts and locks on the circumferential surface of the collar 25 inserted into the mounting bolt 19. There is.

A center bolt 32 is inserted into the center of the recess 7 of the small arch 2, a lock nut 33 is screwed onto the inserted end, and a spring 14 is inserted between the groove 34 formed in the head of the center bolt 32 and the recess 7. It holds the base 29 of the.

The spring 14 is further connected to the brake shoe 1 than the extension part 31.
Bent portion 35 bent and extended from below 5 to near the shoe surface.
and a guide portion 3 which is bent back from near the shoe surface and bent and extended in the direction of the back of the shoe surface and inclined downward.
6, and the bent portion 35 and the guide portion 36 form a tire guide.

Note that the guide portion 36 is desirably set at an inclination angle such that the tire of the wheel mounted on the inclination extension line thereof is located, and the end of the guide portion 36 is preferably placed below the shoe attachment portion 5 as much as possible. It is desirable that it extends over the entire width.

According to the above embodiment, the spring 14 includes the coil portion 30,
30, the extension parts 31, 31 are always urged to expand, and are brought into contact with the collar 25 of 19 on the mounting pole 1, and spring in the direction of expanding the large arches la, lb.

In this state, the arm portion 3 of one of the large arches la, lb abuts and locks on the boss 9 of the other large arch.

A center bolt 32 inserted into the small arch 2 is fastened to a part of the frame of the bicycle, and a Bowden cable with a lever device connected to the other end is introduced near the brake, and is adjusted by a known adjustment tool above the brake. While supporting the outer wire end of the cable, the inner wire is extended and connected to the wires 13 of the large arches la and lb.

Therefore, when the lever device is remotely operated, the inner wire pulls the wire 13 upward, and thereby the large arches 1a and 1b pull the legs 4, 4 against the spring 14 with the pivot point 10.10 as the fulcrum. Reduce and push the brake rubber 16 of the brake shoes 15.15 onto both sides of the wheel rim.

The adjustment tool interposed in the Bowden cable adjusts the relative length of the outer wire and the inner wire constituting the cable, thereby adjusting the pulling state of the wire 13 by the inner wire, that is, the distance between the brake shoe 15 and the tire rim. In order to adjust the distance to a smaller value, the adjustment tool must be operated against the spring 14.

In this invention, when making this adjustment, the tire guide 36.36 is grasped, the extension part 31.31 is separated from the collar 25.25, and the large arches 1a and 1b are spun! It is sufficient to operate the adjusting tool in a free state in which 14 does not act, and the operation is extremely simple and easy.

In addition, when replacing a burst tire on a competition bicycle, etc., the new wheel with the tire attached can be rolled and inserted casually between the large arches 1a and lb, and it will be guided by the guide portions 36° and 36. This allows the tire to be inserted reliably between the large arches la and lb, which is advantageous in that time losses can be reduced as much as possible in timed competitions.

FIG. 9 shows another embodiment of the invention, in which the spring is divided into l pairs of symmetrical springs 14a, 14b.

Each spring 14a, 14b has a coil portion 30 wound around the outer periphery of the boss 8 of the small arch 2, and one end of the spring abuts and locks on a protrusion 37 protruding from the front wall of the small arch 2. , the other end is extended to form an extended portion 31, a bent portion 35, and a guide portion 36 similar to those described above.

The other configurations and operations are the same as those of the above embodiment, so they are not shown.

Although the present invention has been explained based on a center-pull type caliper brake in any of the above embodiments, a side-pull type caliper brake can be applied by extending the spring and forming the extension part, the bending part, and the guide part in a bent manner. Of course, the same method can be applied to brakes as well.

As a result of the present invention constructed as described above, the tire guide is formed by extending and bending the spring itself, so that it is easier to manufacture and more advantageous in terms of the number of parts compared to the prior art.

Furthermore, when adjusting the brakes by gripping the tire guide, the spring itself is contracted together with the guide, so the arch is free in the expansion and contraction direction, which not only makes the adjustment easy, but also allows the spring to be contracted directly. Unlike the conventional separate gripping member, it does not bend and deform.

Therefore, the tire guide always maintains a predetermined proper inclination angle, and guides the tire appropriately when changing tires.
This is especially advantageous for racing bicycles as it can reduce time loss as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a sectional view taken along the line III-III in FIG.
Figure 4 is a front view of the brake shoe, Figure 5 is the same as in Figure 1.
-V cross-sectional view, Figure 6 is a ■I-VI line cross-sectional view in Figure 5, Figure 7 is a VII-Vll line cross-sectional view in Figure 6, Figure 8 is VllllIllll in Figure 3. A line sectional view and FIG. 9 are front views of essential parts showing another embodiment of the present invention. la, lb...Large arch, 2...Small arch, 5...Brake shoe attachment part, 14...
... Spring, 15 ... Brake shoe, 19 ... Mounting bolt, 25 ... Collar, 29 ... Base, 30 ... - Coil part, 31... Extension part, 32... Center bolt, 35... Bent part, 36... Guide part.

Claims (1)

[Scope of utility model registration request] In the caliper brake, brake shoes are provided facing each other at each end of a freely expandable arch, and the arch is constantly urged in the expansion direction by a spring so that the brake shoes separate from each other. A spring is continuously extended downward from the back of the shoe surface of the brake shoe, and the extended portion is bent from below the brake shoe near the shoe surface, and is further bent back from near the shoe surface to extend toward the back of the shoe surface. A tire guide device for a caliper brake, characterized in that it is provided with a tire guide that is bent downwardly.