JPH0243839Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a quick release device for a bicycle caliper brake.

(Prior Art) Caliper brakes for bicycles are designed to allow for fine adjustment of the distance between the brake shoe and the wheel rim, and for easy attachment and detachment of the wheel by widening the distance between the brake shoe and the wheel rim. Some are equipped with a quick release device.

The above-mentioned quick release device includes, for example,
There is a system shown in Japanese Utility Model Application Publication No. 59-182488, in which a mounting hole is formed in one of a pair of brake arms, and a cam body having an eccentric shaft hole is rotatably inserted into the mounting hole. A wire holder to which the inner wire of the Bowden wire is connected is rotatably inserted into the eccentric shaft hole, and the base of the operating lever is fitted onto the cam body so as to be relatively unrotatable.

(Problem to be solved by the invention) By the way, in the above-mentioned conventional method, no device was provided to restrict the rotation of the operating lever, so for some reason the operating lever could rotate unexpectedly, causing damage to the cam body. There was a fear that the brake arm would rotate and both brake arms would expand.

The object of the present invention is to provide a quick release device for a caliper brake that can solve the above problems.

(Means for Solving the Problems) In order to achieve the above object, the feature of the present invention is that a mounting hole 10 is formed in one of the pair of brake arms 1 and 2; , the cam body 14 having the eccentric shaft hole 17 is rotatably inserted, the wire receiver 22 for receiving the end of the operating wire 5 is rotatably inserted into the eccentric shaft hole 17, and the cam body 14 is rotatably inserted.
In the case where the base of the operating lever 19 is fitted onto the outside so as not to be relatively rotatable, the base portion of the operating lever 19 is fitted into the mounting hole 10, adjacent to the operating lever 19 in the axial direction, and being able to freely rotate relative to the cam body 14 and in the axial direction. Rotation regulating body 2 movably fitted on the outside
5 is fitted so as to be relatively unrotatable but movable in the axial direction, and an engaging surface 27 having an uneven shape in the circumferential direction is formed on the end surface of the rotation regulating body 25 on the operation lever 19 side, and the From the base of the lever 19, the engagement protrusion 21 is rotated, which engages and disengages from the engagement surface 27 by moving the rotation regulating body 25 in the axial direction, and restricts the rotation of the operating lever 19 by engaging with the engagement surface 27. It is provided protruding from the movement regulating body 25 side, is adjacent to the rotation regulating body 25 in the axial direction on the side opposite to the operation lever 19 side in the equipment hole 10, and is fitted onto the cam body 14 so as to rotate. An elastic body 2 that urges the regulating body 25 toward the operating lever 19 side and allows the rotation regulating body 25 to move in the axial direction to the side opposite to the operating lever 19 side by elastic deformation.
It is at the point where 8 is fitted.

(Function) According to the present invention, the rotation regulating body 25 is biased rearward by the O-ring 28 illustrated as an elastic body, so that the engagement surface 27 of the rotation regulating body 25 and the operating lever 19 engage with each other. Since the protrusion 21 is engaged and thereby restricts the rotation of the operating lever 19,
It is possible to eliminate the possibility that the operating lever 19 will rotate unexpectedly for some reason.

Further, when widening the distance between both brake shoes 3 and the wheel rim, the operating lever 19 is rotated in the direction of the arrow in FIG.
rotates, the inner wire 8 slides relatively within the outer wire 6, and both brake arms 1 and 2 are expanded by the biasing spring.

At this time, the engagement protrusion 21 of the operating lever 19 slides on the engagement surface 27 of the rotation regulating body 25 in the circumferential direction.

In this case, due to the elastic deformation of the O-ring 28,
The rotation regulating body 25 reciprocates in the axial direction, whereby the engagement protrusion 21 smoothly overcomes the peaks of the engagement surface 27 one after another, thereby smoothly engaging and disengaging from the engagement surface 27. The operation is repeated, and therefore, the operating lever 19 can be rotated smoothly, and the operating lever 19 can be fixed at a desired rotational position.

(Embodiment) Hereinafter, an embodiment of the present invention will be described based on the drawings. In FIG. is permanently installed.

Both brake arms 1 and 2 are swingably supported on the bicycle frame by a center bolt 4, and both brake arms 1 and 2 can be opened and closed freely, and are biased in the direction of expansion by a biasing spring (not shown). There is.

5 is a Bowden wire exemplified as an operating wire, which is used to link a brake lever (not shown) with both brake arms 1 and 2, and one end of the outer wire 6 is connected to the upper end of the right end of the Y-shaped brake arm 1. One end of the inner wire 8 is connected to the right end of the C-shaped brake arm 2 via a quick release device 9.

The quick release device 9 is constructed as follows.

That is, as shown in FIGS. 1, 3, and 4, a mounting hole 10 is formed in the right end of the C-shaped brake arm 2 in the front-rear direction. The equipment hole 10 is configured with a small diameter part 11 on the front side and a large diameter part 12 on the rear side, and has a stepped shape, and the large diameter part 12 is formed by counterboring or the like. Further, a U-shaped engagement recess 13 is formed on the inner circumferential surface of the large diameter portion 12 .

14 is a cam body, which includes a flange portion 15 and a body portion 16.
The body part 16 is inserted into the equipment hole 10 from the front side in a freely insertable and removable manner, and the flange part 15 is in contact with the front surface of the C-shaped brake arm 2.

An eccentric shaft hole 17 is formed through the cam body 14 in the front-rear direction, and a portion of the rear side of the body portion 16 is cut out to form a locking stepped portion 18 .

Reference numeral 19 denotes an operating lever, and a fitting hole 20 at its base is removably fitted into the rear part of the body 16 of the cam body 14, and by engaging with the locking step 18, the operating lever 19 and the cam are connected. It is not possible to rotate relative to the body 14.

The base of the operating lever 19 is a C-shaped brake arm 2
In addition to contacting the rear wall surface, an engaging protrusion 21 having a hemispherical shape or the like is provided to protrude from the base from the front side.

22 is a wire holder to which one end of the inner wire 8 is releasably connected and fixed;
3 is inserted into the eccentric shaft hole 17 of the cam body 14 from the rear side in a freely removable and rotatable manner, and its flange portion 24 cooperates with the C-shaped brake arm 2 to clamp the base of the operating lever 19. It is said that

31 is a fixing screw, which is attached to the shaft portion 23 of the wire holder 22.
It is inserted from the front side and is screwed into the
The wire holder 22 is prevented from coming out of the eccentric shaft hole 17.

Reference numeral 25 denotes a ring-shaped rotation regulating body, which is rotatably relative to the body 16 of the cam body 14 and movable in the axial direction, and is detachably fitted onto the outside of the equipment hole 1.
It is fitted into the rear part of the large diameter part 12 of 0 so as to be movable in the axial direction and detachable.

The rotation regulating body 25 includes an engagement recess 1 of the large diameter portion 12.
3, and the rotation regulating body 25 is made relatively immovable within the large diameter portion 12.

The rear end surface of the rotation regulating body 25 is an engagement surface 27,
The engagement surface 27 has peaks and valleys formed continuously in the circumferential direction, and has an uneven shape in the circumferential direction.

The engagement surface 27 removably engages with the engagement protrusion 21 of the operation lever 19 to restrict rotation of the operation lever 19. The engagement surface 27 restricts the rotation of the operation lever 19 by moving the rotation restriction body 25 in the axial direction. The surface 27 engages with and disengages from the engagement protrusion 21 .

Reference numeral 28 denotes an O-ring exemplified as an elastic body, which is made of urethane rubber or the like, and is removably fitted to the rear side of the body portion 16 of the cam body 14, and removably fitted into the front portion of the large diameter portion 12. are combined.

The O-ring 28 connects the rotation regulating body 25 and the equipment hole 10.
It is interposed between the stepped surfaces 29 in a spring-like manner, and urges the rotation regulating body 25 rearwardly, and also allows the rotation regulating body 25 to move in the axial direction due to elastic deformation. .

In the embodiment, an O-ring is used as the elastic body, but a spring washer, a disc spring, etc. may also be used as the elastic body.

Further, the quick release device may be provided at a portion of the brake arm that receives the outer wire.

(Effects of the invention) As detailed above, according to the invention, it is possible to prevent accidental rotation of the operating lever, and when the operating lever is rotated, the operating lever can be rotated smoothly. The operating lever can be fixed at a desired rotational position. The present invention has the above advantages and is of great practical benefit.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a plan sectional view of the main part, Fig. 2 is an overall front view, Fig. 3 is a sectional view taken along the line A-A in Fig. 2, and Fig. 4 is an exploded perspective view of FIG. 3; 1, 2... Brake arm, 3... Brake shoe, 5... Bowden wire, 6... Outer wire,
7, 22... wire receiver, 8... inner wire,
9... Quits crease device, 10... Equipment hole,
14... Cam body, 17... Eccentric shaft hole, 19... Operating lever, 21... Engaging protrusion, 25... Rotation regulating body, 27... Engaging surface, 28... O ring (elastic body) .

Claims (1)

[Scope of claim for utility model registration] Equip hole 1 in one of the pair of brake arms 1 and 2
0, the cam body 14 having an eccentric shaft hole 17 is rotatably inserted into the equipment hole 10, and the wire holder 22 for receiving the end of the operating wire 5 is rotated into the eccentric shaft hole 17. The base of the operating lever 19 is inserted into the cam body 14 so as to be movable, and the base of the operating lever 19 is fitted onto the cam body 14 so as not to be relatively rotatable. Rotation regulating body 2 fitted externally so as to be rotatable and movable in the axial direction
5 is fitted so as to be relatively unrotatable but movable in the axial direction, and an engaging surface 27 having an uneven shape in the circumferential direction is formed on the end surface of the rotation regulating body 25 on the operation lever 19 side, and the From the base of the lever 19, the engagement protrusion 21 is rotated, which engages and disengages from the engagement surface 27 by moving the rotation regulating body 25 in the axial direction, and restricts the rotation of the operating lever 19 by engaging with the engagement surface 27. It is provided protruding from the movement regulating body 25 side, is adjacent to the rotation regulating body 25 in the axial direction on the side opposite to the operation lever 19 side in the equipment hole 10, and is fitted onto the cam body 14 so as to rotate. An elastic body 2 that urges the regulating body 25 toward the operating lever 19 side and allows the rotation regulating body 25 to move in the axial direction to the side opposite to the operating lever 19 side by elastic deformation.
A quick release device for caliper brakes characterized by fitting 8.