JPH0136711Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is mainly used for caliper brakes to be attached to the front fork or back fork of a bicycle. The present invention relates to a caliper brake in which a fixture is provided and a second arm supports a cylindrical support of an outer cylinder that guides the wire.

(Prior Art) Conventionally, in this type of caliper brake, a cylindrical adjustment body is screwed onto the support, and the relative effective length between the wire and the outer cylinder is adjusted by rotating the adjustment body.
Further, there is known a shoe clearance that can be adjusted between a pair of shoes attached to both arms and the wheel rim.

However, this conventional caliper brake has a structure in which the outer tube is supported by the second arm via the support and the adjustment body, and when the adjustment body is rotated, the adjustment body is made of aluminum. Since the adjustment body rotates in constant contact with the second arm formed of a light metal such as the like, there is a problem in that the rotational resistance during the rotation operation of the adjustment body is very large, and the operability of the adjustment body is poor.

Conventionally, the adjustment body is provided with an engagement protrusion, and the second arm is provided with an engagement groove that engages with the engagement protrusion to position the adjustment body. It is known that the adjustment body is received by the support tool and the adjustment body, but even in this conventional structure, the rotational operability of the adjustment body was poor.

(Problems to be Solved by the Invention) The present invention attempts to solve the problem of poor operability of the adjustment body in the prior art, and uses a synthetic resin body to create an adjustment body by using the synthetic resin body. In addition, the synthetic resin body is prevented from being damaged by the tensile force caused by pulling the operating wire that acts on the outer cylinder during braking operation.

(Means for Solving the Problems) Accordingly, the present invention includes a first arm and a second arm, the first arm is provided with a fixing device for the operating wire, and the second arm is provided with a tube of an outer tube that guides the wire. A caliper brake comprising a shaped support tool supported via a cylindrical adjustment body screwed onto the support tool,
One of the second arm or a fixed member fixed to the second arm and the adjusting body is provided with a synthetic resin body that comes into contact with the other when the adjusting body is rotated, and the synthetic resin body is provided with the adjusting body. A contact permitting portion is provided for bringing the adjusting body into contact with the second arm or the fixing member after adjustment by rotating the body.

(Function) When rotating the adjusting body, the adjusting body can be smoothly rotated without constantly contacting the second arm or the fixed member, and after adjusting the adjusting body, the adjusting body can be rotated smoothly. The tensile force that is applied to the outer cylinder by contacting the second arm or the fixing member is applied straight to the second arm or the fixing member via the support and the adjustment body.

(Example) Hereinafter, an example of the caliper brake of the present invention will be described based on the drawings.

The caliper brake shown in FIG. 7 has a pivot shaft 1 attached to the front fork or pack fork of a bicycle, a first arm 3 having a shoe 2 at one end, and a shoe 5 at one end of a curved main rod 41. , and the other end of the curved main rod 41 of the second arm 4 having a branch rod 42 in the middle of the curved main rod 41 is pivotally supported, and a return spring 6 is provided between these arms 3 and 4. While the springs 6 urge the arms 3 and 4 in the direction of separation, a fixture 7 for fixing one end of the operating wire W is attached to the other end of the first arm 3, and a branch of the second arm 4 is attached to the other end of the first arm 3. A cylindrical support 8 of an outer tube O for guiding the wire W is supported at the tip of the rod 42 via a cylindrical adjustment body 9 screwed onto the support 8, and by pulling the wire W, the cylindrical support 8 of the outer cylinder O is supported. It is constructed so that each arm 3, 4 swings to perform braking.

However, in the caliper brake constructed as described above, this invention has a cylindrical synthetic resin body 10 at the tip of the branch rod 42 of the second arm 4, as shown in FIGS. of,
The bottom surface 11a of the contact allowing portion 11 is connected to the branch rod 42.
The contact permitting portion 11 is held flush with or less than the surface 42a of the adjusting body 9.
An engaging protrusion 91 is provided that detachably engages with the branch rod 42 and comes into contact with the surface of the branch rod 42 during this engagement.

In the above configuration, the synthetic resin body 10 is
It is held non-rotatably in a stepped holding hole 43 provided at the tip of the branch rod 42, and the contact permitting portion 11 of the synthetic resin body 10 is formed into a curved section extending in the radial direction. The bottom surface 11a is flush with the surface 42a or less, that is, the surface 42a
When the engaging protrusion 91 is engaged with the contact permitting part 11, a part of the engaging protrusion 91 is flush with the surface 42a or positioned closer to the holding hole 43 than the surface 42a. It is accomplished as if in contact with.

Further, the adjusting body 9 is formed to have a larger diameter than the synthetic resin body 10, and has the engaging protrusion 91 on one end surface thereof.
was established. Further, the engaging protrusion 91 is formed to have a curved cross section extending in the radial direction, and to have a longer length than the contact permitting portion 11, so that when engaging with the contact permitting portion 11, both ends in the length direction The contact allowing portion 11 is made to protrude outward from both ends in the length direction, and the protruding both ends are connected to the surface 42a of the branch rod 42.
It is done as if in direct contact with. Note that the shape and number of the engaging protrusion 91 and the contact allowing portion 11 are not particularly limited.

Further, the synthetic resin body 10 has a stepped outer peripheral surface having a small diameter portion and a large diameter portion, so that the engagement between the stepped portion of the synthetic resin body 10 and the stepped portion of the holding hole 43 is improved. In addition, as shown in FIG. 5, flat surfaces for preventing rotation are provided in the small diameter portion and the small diameter hole portion of the holding hole 43, respectively, to prevent the synthetic resin body 10 from moving to one side in the axial direction. Rotation of the body 10 relative to the branch rod 42 is prevented.

The support 8 includes a cylindrical receiving part 81 that receives one end of the outer cylinder O, and a cylindrical shaft part 82 provided with a thread on the outer periphery. As shown in FIG.
rotation with respect to the synthetic resin body 10 is prevented, and the support 8 is made movable only in the axial direction with respect to the synthetic resin body 10, and the support 8 is moved in the axial direction with respect to the synthetic resin body 10 by rotation of the adjustment body 9. It's being accomplished very well.

In addition, 92 in the figure is a ring held on the outer periphery of the adjustment body 9.

The present invention is constructed as described above, and when the brake is attached to the front fork or back fork, or when the operating wire W is stretched or the outer cylinder O is shortened,
Due to wear and tear on the shoes 2 and 5,
When adjusting the shoe clearance between the wheel rim R and the wheel rim R, the adjustment body 9 is rotated, the support 8 is moved in the axial direction with respect to the adjustment body 9 and the synthetic resin body 10, and the support 8 is supported by the support 8. The relative effective length of the outer tube O and the wire W is adjusted.

As shown in FIG.
When the engaging protrusion 91 is rotated, the engaging protrusion 91 is first disengaged from the surface 42a, and then the contact allowing part 11 is disengaged from the surface 42a.
While the engagement position with the contact permitting portion 11 is displaced, the engagement with the contact permitting portion 11 is disengaged, and then, as shown in FIG. The engagement protrusion 91 engages with the contact permitting portion 11 as shown in FIG.
The shoe clearance is adjusted.

During this adjustment, the engagement protrusion 91 of the adjustment body 9 is
Since it comes into contact with the surface 42a of the branch rod 42 only when it engages with the bottom surface 11a of the contact allowing portion 11, and is in contact with the synthetic resin body 10 at other times, it is possible to smoothly rotate the adjustment body 9. It can be done.

Also, after completing the above shoe clearance adjustment,
The engaging protrusion 91 is engaged with the contact permitting portion 11 to maintain the operating position of the adjusting body 9. At this time, the engaging protrusion 91 comes into contact with the contact permitting part 11 at its intermediate portion in the longitudinal direction, and also comes into contact with the surface 42a of the branch rod 42 at both end portions in the longitudinal direction. Therefore, when braking is performed by pulling the wire W, the tensile force in the direction of the arrow in FIG. 42 surface 42a
As a result, even if an excessive tensile force acts on the outer tube O, damage to the synthetic resin body 10 due to the tensile force can be prevented, and the This can improve durability.

In addition, in the embodiment described above, the synthetic resin body 10
A contact permitting portion 11 is provided on the adjusting body 9, and an engaging protrusion 9 is provided on the adjusting body 9.
1 is provided, but the opposite may be provided.

Further, in the above embodiment, the synthetic resin body 10 is
Although it was held in arm 4, other parts such as 9th to 11th
It may also be held in an adjustment body 90 as shown in the figure.

9 to 11, a horizontal hole 44 extending in the same direction as the pivot shaft 1 is provided in the branch rod 42 of the second arm 4, and the support 8 is inserted into the horizontal hole 44. A shaft-shaped fixing member 20 having a through hole 21 for receiving the cylindrical shaft portion 82 is rotatably supported, and the upper surface of the fixing member 20 serves as an engaging protrusion 91a. , a synthetic resin body 10 that comes into contact with the engagement protrusion 91a of the fixing member 20;
0 was attached, and the contact permitting portion 11 was provided by cutting out the radially central portion of the synthetic resin body 100 so that the lower end surface 90a was exposed to the outside. Note that the structure of the fixing member 20 is not particularly limited.

Furthermore, in the above description, the first and second arms 3 and 4 have been referred to as "first" and "second" for convenience of explanation, but any one of the two arms may be the first.

(Effects of the Invention) As described above, the present invention provides for the adjusting member to be attached to one of the second arm supporting the outer cylinder or the fixing member fixed to the second arm, and the adjusting body screwed into the support for the outer cylinder. A contact permitting part is provided with a synthetic resin body that comes into contact with the other body during a rotational operation of the body, and that makes the adjustment body contact the second arm or the fixing member after adjustment by the rotational operation of the adjustment body. Because of the provision of the above, the adjustment body can be rotated smoothly due to the sliding property of the synthetic resin body, and at the same time, an excessive tensile force acting on the outer tube during braking operation by pulling the operation wire can be avoided. can act straightly on the second arm or the fixing member via the support and the adjusting body, so it is possible to reliably prevent damage to the synthetic resin body due to the tensile force, and therefore it can be used for a long period of time. The adjustment body can be rotated smoothly over the period of time.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of only the main parts showing an embodiment of the caliper brake of the present invention, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is a perspective view of only the adjusting body, and Fig. 4 is a FIG. 5 is a perspective view of only the cylindrical receiver, FIG. 5 is a cross-sectional view taken along the line of FIG. The partially cutaway front view and FIGS. 8 to 11 show other embodiments. FIG. 8 is a perspective view of the adjusting body holding the synthetic resin body, and FIG. 9 is a diagram showing only the main parts. A sectional view, FIG. 10 is a front view of only the main parts, and FIG. 11 is an explanatory diagram showing the state of the adjusting body during rotational operation. 3...First arm, 4...Second arm, 42a
...Surface, 7... Fixture, 8... Support, 9...
Adjustment body, 10...Synthetic resin body, 20...Fixing member.

Claims (1)

[Scope of utility model registration request] A cylindrical adjustment body comprising first and second arms, wherein the first arm is provided with a fixing device for the operating wire, and the second arm is screwed into a cylindrical support of an outer cylinder that guides the wire. A caliper brake supported through a caliper brake, wherein one of the second arm or a fixed member fixed to the second arm and the adjustment body has a synthetic member that comes into contact with the other when the adjustment body is rotated. In addition to providing a resin body, this synthetic resin body is
A caliper brake characterized in that a contact permitting portion is provided for bringing the adjusting body into contact with the second arm or the fixed member after adjustment by rotating the adjusting body.