JPH0535580U - Bicycle brake - Google Patents

Abstract

(57) [Summary] [Purpose] The above-mentioned brake shoe attachment adjustment and brake shoe replacement can be easily performed without reducing the degree of freedom in adjusting the brake shoe. A bolt body is fixed to the brake arm by screwing a nut on an outer peripheral thread portion, and a mounting shaft of a brake shoe inserted into a mounting shaft holding hole of the bolt body is fixed to the bolt body. It is fixed to the bolt body by a mounting shaft fixing means provided in the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle brake, and more particularly, to a bicycle brake configured to facilitate adjustment of a mounting position of a brake shoe.

[0002]

[Prior Art]

 For example, in the case of a caliper brake, the brake shoes are attached to a pair of brake arms swingably supported on a bicycle frame (front fork or back fork) so as to face the wheel rim. .. Then, by operating the brake lever to swing the pair of brake arms in the braking direction (the direction in which the brake shoe approaches the rim), each brake shoe clamps both side surfaces of the wheel rim, It is designed to be able to brake the wheels.

By the way, in such a bicycle brake device, good braking performance cannot be obtained unless the positional relationship between the brake shoe and the rim of the vehicle wheel is appropriate. However, depending on the type of bicycle on which the brake device is mounted, the mounting position of the support shaft that rotatably supports the brake arm on the bicycle frame and the inclination angle of the front fork may differ. In this case, even with the same braking device, the mounting position and mounting angle of the brake shoe should be adjusted appropriately according to the bicycle on which it is mounted so that the brake shoe has an appropriate positional relationship with the wheel rim. Need to be able to. Also, if the brake rubber of the brake shoe wears and the distance between the brake shoe and the rim becomes larger than originally, the brake shoe should be installed closer to the rim in order to prevent deterioration of braking performance. -It is necessary to correct the positional relationship between the shoe and the rim. For this reason, the brake shoe is often attached to the brake arm by an attachment structure that allows the attachment position to be adjusted appropriately.

An example of the mounting structure will be described below with reference to FIGS. 7 and 8. As shown in FIGS. 7 and 8, the brake shoe mounting portion 1a of the brake arm 1 is provided with a vertically elongated slot-shaped bolt body insertion hole 2 that penetrates in the vehicle front-rear direction. In the bolt body insertion hole 2, a bolt body 5 having a large diameter front end portion having a mounting shaft holding hole 3 penetrating diametrically and a rear end portion having a screw portion 4 is provided. The hole 3 and the screw portion 4 are loosely inserted so as to be exposed in the front and rear of the brake mounting portion 1a.

Then, the mounting shaft 6a protruding from the rear surface of the brake shoe 6 is inserted into the mounting shaft holding hole 3 of the bolt body 5 with its tip exposed, and the screw portion 4 is also inserted. A nut 7 is screwed on the mounting shaft 6a so that the mounting shaft 6a is substantially pinched and held by the front side surface of the brake shoe mounting portion 1a and the inner peripheral surface of the mounting shaft holding hole 3 on the front side. The shoe 6 can be fixed to the brake arm 1. That is, when the nut 7 is tightened, the mounting shaft 6a is pressed to one side of the inner peripheral surface of the mounting shaft holding hole 3, while the portion exposed from the mounting shaft holding hole 3 and the brake shoe mounting portion. It is pressed against the side surface of the sliding seat body 8 which is interposed between the front side surface of 1a. The sliding seat body 8 is also pressed against the front side surface of the brake shoe mounting portion 1a by the pressing of the mounting shaft 6a, whereby the mounting shaft 6a or the brake shoe 6 is fixed to the brake arm 1. Further, in this case, the bolt body 5 is also fixed to the brake arm 1 by the engagement between the mounting shaft holding hole 3 and the mounting shaft 6a.

In the mounting structure described above, (1) by sliding the bolt body 5 in the bolt body insertion hole 2 in the vertical direction along the elongated hole of the bolt body insertion hole 2, (2) Rotate the bolt body 5 extending in the front-rear direction in the bolt body insertion hole, so that the brake shoe 6 in the direction of the arrow B (see FIG. 7). (3) Adjust the insertion amount of the mounting shaft 6a into the mounting shaft holding hole 3 to adjust the mounting position of the brake shoe 6 in the direction of arrow C (see FIG. 7). By rotating 6a, the inclination of the brake shoe 6 in the direction of arrow D (see FIG. 8) can be adjusted.

Further, as shown in FIGS. 7 and 8, in the present example, the front side surface of the brake shoe mounting portion 1a is formed into a concave curved surface curved in the arrow E direction (see FIG. 7). The peripheral portion of the mounting shaft holding hole on the back side surface is formed into a convex curved surface curved in the direction of arrow E, and the sliding seat body 8, the nut 7 and the back side surface of the brake shoe mounting portion 1a are formed. By forming each of the facing surfaces of the sliding seat body 9 interposed between the brake shoe mounting portion 1a and the curved surface, (5) the mounting angle of the bolt body 5 in the arrow E direction can be adjusted. ing.

With the above configuration, in addition to the above-described adjustment in the four directions, the inclination of the brake shoe 6 in the direction of arrow E in FIG. 7 can also be adjusted, and a total of five directions can be adjusted. .. In this case, the width of the bolt body insertion hole 2 is set to be larger than the outer diameter of the small diameter shaft portion 5b of the bolt body 5.

[0009]

[Problems to be solved by the device]

 By the way, in such a mounting structure, when adjusting the position of the brake shoe 6, the nut 7 must be loosened to release the fixing of the mounting shaft 6a or the brake shoe 6 to the brake arm 1.

That is, when the brake shoe is worn out, the mounting shaft 6a must be adjusted so as to approach the wheel rim. However, as described above, when the nut 7 is loosened, not only the movement of the brake shoe in the direction facing the rim (the direction of arrow C) is allowed, but also the fixing in all other directions described above. It will be canceled. That is, in the conventional mounting structure, when the nut 7 is loosened, both the fixing of the mounting shaft 6a to the bolt body 5 and the fixing of the bolt body 5 to the brake arm 1 are released. Will end up. For this reason, for example, among the above-mentioned position adjustments, when the position adjustment in one direction against abrasion of the brake shoe is performed, the positional relationship of the brake shoe 6 in the other four directions is not disturbed, and in the two directions. When adjusting the position of, the brake shoe 6 and the bolt body 5 must be held one by one so that the positional relationship in the other three directions is not disturbed.

As a result, when the positional relationship in the direction in which the adjustment is not performed is not held by a finger or the like, the position of the brake shoe 6 in the other direction, which has been carefully adjusted, is deviated, and the positions in all the five directions from the beginning are changed. The adjustment will have to be redone. As a result, in the case of the above-mentioned conventional mounting structure, although the position of the brake shoe can be adjusted widely, there is a problem that the adjustment work is very troublesome.

As a solution to the above problem, JP-B-55-47740 discloses that the mounting shaft is pressed between the brake arm and the mounting shaft of the brake shoe toward the inner peripheral surface of the through hole of the bolt body. A cantilever brake for a bicycle is disclosed that is configured to interpose an elastic body. However, in the case of the brake device of the above publication, since the elastic body can be held by the elastic force, the hand is mistakenly placed between the elastic body or this and the mounting shaft during the adjustment work. If the washer comes into contact with the washer, the position of the elastic body will be misaligned, the fixing of the mounting shaft to the bolt body will be released, the positional relationship between the mounting shaft and the bolt body will change, and the mounting shaft will slip out of the bolt body. The problem arises that it will end up. Therefore, during the adjustment work, there is a trouble that the nerve must be used so as not to shift the elastic body.

The present invention has been devised under the above-mentioned circumstances, and solves the above-mentioned conventional problems, and adjusts the attachment and adjustment of the brake shoe without reducing the degree of freedom in adjusting the brake shoe. It is an object of the present invention to provide a brake that allows easy replacement of brake shoes.

[0014]

[Means for Solving the Problems]

 The present invention takes the following technical means in order to solve the above problems. That is, according to the invention of the present application, a penetrating bolt body insertion hole is provided in each brake shoe mounting portion of a pair of brake arms that are swingably supported with respect to a bicycle frame, while a diametrical penetrating hole is provided at one end. The mounting shaft holding hole, the bolt body having the outer peripheral threaded portion at the other end, the bolt shaft insertion hole, the mounting shaft holding hole and the screw portion are exposed before and after the brake shoe mounting portion, respectively. The brake shoe is adjustably attached to the brake arm by loosely inserting it and holding the attachment shaft protruding from the back surface of the brake shoe through the attachment shaft holding hole of the bolt body. In the bicycle brake configured as described above, one of the bolt body is fixed to the break arm by screwing a nut onto the outer peripheral thread portion. The mounting shaft inserted into the mounting shaft holding hole is fixed to the bolt body by mounting shaft fixing means provided in the bolt body.

[0015]

[Operation and effect of the device]

 In the brake according to the present invention, the brake shoe is fixed to the bolt body, and the bolt body is fixed to the brake arm separately. Therefore, if the nut that is screwed into the small-diameter portion of the bolt body to loosen the brake arm is loosened, the bolt body is released from the bolt arm. The fixation is not released.

On the other hand, when the mounting shaft fixing means for fixing the brake shoe to the bolt body is released, the mounting shaft of the flexure shoe can slide or rotate in the mounting shaft holding hole in the axial direction, Brake shoe wheel rim adjustments can be made. At this time, the adjustment of the brake shoe can be performed without releasing the fixing of the bolt body to the brake arm. In the brake having the above structure, the bolt body can be moved in the bolt body insertion hole by loosening the nut and releasing the fixing of the bolt body to the brake arm.

Thus, (1) by rotating the bolt body around its axis, the mounting position of the brake shoe in the direction around the axis of the bolt body can be adjusted, and (2) the bolt body can be shaped like an elongated hole. The vertical position of the brake shoe can be adjusted by shifting the bolt body in the bolt body insertion hole in the vertical direction. (3) Rotate the bolt body in the bolt body passage hole in the horizontal plane of the vehicle width direction. The angle of the brake shoe with respect to the rim can be adjusted accordingly.

When adjusting the above (1) to (3), the adjustment can be performed without releasing the mounting shaft fixing means, so that the relative position of the brake shoe with respect to the bolt body is not changed. Adjustments can be made. Therefore, even if the nut is loosened, the positional relationship between the mounting shaft or the brake shoe and the bolt does not change. As a result, for example, when changing the position of the bolt body in the bolt body insertion hole and adjusting only the vertical position of the brake shoe with respect to the rim, the brake shoe that has been carefully adjusted as in the past is used. The positional relationship with the bolt body does not change. As a result, it is not necessary to hold the brake shoe and the bolt body so that their relative positions are not misaligned during the adjustment work, and the adjustment work is greatly facilitated.

On the other hand, by releasing the mounting shaft fixing means, (4) adjustment of the rotational position of the brake shoe about the mounting shaft, and (5) the mounting shaft holding hole of the mounting shaft of the brake shoe with respect to the mounting shaft holding hole. Adjusting the amount of protrusion can be performed.

The adjustment of the brake shoes described in the above ((4) and (5)) is an adjustment necessary when the brake rubber is worn or when the brake shoes are replaced. It is possible to prevent deterioration of braking performance. When the above adjustment is performed, the adjustment can be performed without releasing the fixing of the bolt body to the brake arm, so that it is not necessary to perform the above adjustments (1) to (3). As a result, the adjustment is greatly facilitated when the brake rubber is worn or the brake shoes are replaced.

Moreover, since it is not necessary to perform the relatively difficult adjustment work in the step of assembling the brake device of the above (1) to (3) to the frame, the replacement work of the brake shoes can be performed very easily. As a result, it is not necessary to adjust the brake shoe in all directions when replacing the brake shoe, and the brake shoe can be adjusted reliably and quickly. In addition, there is no risk that the brake performance will deteriorate due to the adjustment of the brake shoe and the angle will change. Furthermore, since adjustment work is extremely easy, it is possible to use brake shoes made of a material that wears quickly but has good braking performance, which improves driving safety.

[0022]

【Example】

 Hereinafter, an embodiment of a bicycle brake according to the present invention will be specifically described with reference to FIGS. 1 to 6. FIG. 1 is a front view of an embodiment in which the present invention is applied to a cantilever type brake 10 for a bicycle.

As shown in this figure, in the cantilever brake, a vehicle body front-rear direction support formed on a pair of left and right frames 12 and 12 (front fork or back fork) extending vertically so as to sandwich the wheel 11 therebetween. A pair of left and right brake arms 16a and 16b having brake shoes 15 and 15 attached to operation arm portions 14 and 14 are swingably supported on the shafts 13 and 13, respectively. Return springs 17, 17 are interposed between the brake arms 16a, 16b and the support shafts 13, 13 as shown in FIG. , 16b are constantly elastically urged in a direction (direction of arrow F) in which the brake shoes 15, 15 move away from both side surfaces of the rim 8 of the wheel.

In the present embodiment, the input arm portions 19 a and 19 b extending outward of the brake arms 16 a and 16 b are engaged with the wire engaging groove 21 of the wire suspending metal fitting 20 at the middle portion to form a bifurcated shape. Both ends of the extending suspension wire 22 are connected to each other. One end of the suspension wire 22 is screwed to the input arm portion 19a of the brake arm 16a on the right side of the drawing with a fastening screw 23, while the nipple 24 provided on the other end is provided to the input arm portion 19b on the left side. By being locked in the locking recess 25 formed in, the both ends thereof are respectively connected to the brake arms 16a and 16b. The wire hanging metal fitting 20 is connected to a brake wire 26 extending from a brake lever (not shown) above the wheel 11 by a fastening bolt 27.

When a brake lever (not shown) is operated, the wire suspending metal 20 is pulled upward through the brake wire 26, and the suspending wire 22 whose middle portion is locked by the wire suspending metal 20 is also pulled. The input arm portions 19a and 19b are pulled up. Then, the brake arms 16a and 16b are swung in the direction of approaching each other (direction of arrow S) around the support shaft 13 as a center, whereby the brake shoes 15 and 15 of the two operation arm portions 14 and 14 are moved to the wheel. The wheels 11 are braked by clamping both side surfaces of the rim 18 of the wheel 11. When the brake lever is loosened, the return springs 17 and 17 cause the brake arms 16a and 16b to rotate in the direction opposite to the braking direction (arrow F direction), and the braking of the vehicle wheel 11 is released.

Now, in the brake shoe mounting structure of the brake according to the present embodiment, as shown in FIG. 3, the brake shoe mounting portion 28 in the middle portion of the brake arms 16a and 16b is provided with a vertical shoe that penetrates in the vehicle longitudinal direction. A bolt body insertion hole 29 having an elongated hole is provided in the direction, and the bolt body 30 holding the brake shoe 15 is inserted and held in the bolt body insertion hole 29.

The bolt body 30 includes a small diameter portion 31 that is inserted into the bolt body insertion hole 29 and a front large diameter portion 32 that holds the brake shoe 15. A screw 33 is formed on the outer periphery of the end of the small diameter portion 31. Then, the small-diameter portion 31 is inserted into the bolt body insertion hole 29 via the seats 34b and 34a, and the nut 35 is screwed into the screw 33, so that the brake arm 16 is connected to the large-diameter portion 32. The bolt body 30 is fixed to the brake arms 16a and 16b so as to be sandwiched between the bolt body 30 and the nut 35.

On the other hand, a mounting shaft support hole 36 is formed in the large diameter portion 32 in a direction perpendicular to the shaft of the bolt body 30, and a brake shoe inserted and supported in the mounting shaft support hole 36 is formed. Mounting shaft fixing means 38 for adjusting and fixing the mounting shaft 37 of 15 at a predetermined position is provided. As shown in FIGS. 3 and 4, the mounting shaft fixing means 38 according to the present embodiment communicates from the tip of the large diameter portion 32 to the inner peripheral portion of the mounting shaft support hole, and the large diameter portion 32. In addition to forming a split groove 39 that bisects the front part of the mounting shaft support hole 36 along the central axis, as shown in FIG. The through hole 32a and the screw hole 32b on the other side are formed so as to communicate with each other on the same axis. The tightening screw 41 inserted into the screw insertion hole 32a is screwed into the screw hole 32b.

When the tightening screw 41 is tightened, the large-diameter portions 32a and 32b divided by the split groove 39 are brought close to each other and the width of the split groove 39 is narrowed, whereby the mounting shaft holding hole is formed. The inner diameter of 36 is forcibly reduced. As a result, the mounting shaft 37 of the brake shoe inserted through the mounting shaft holding hole 36 is pinched by the inner peripheral wall of the mounting shaft holding hole 36, and the brake shoe 15 is fixed to the bolt body 30. In addition, in this embodiment, as shown in FIGS. 2 and 3, the peripheral portions of the bolt body insertion holes 29 on the front side surface and the back side surface of the brake shoe mounting portion 28 are formed into a curved surface curved in the arrow E direction. Has been formed.

Further, a seat body 34 a interposed between the front side surface of the brake shoe mounting portion 28 and the large diameter portion 32 of the bolt body 30, and the back surface of the brake mounting portion 28 and the nut 35. The surfaces of the seat body 34b interposed between the brake shoe attachment portion 28 and the seat body 34b are also formed in curved surfaces corresponding to the front side surface and the back side surface of the brake shoe attachment portion 28, respectively. In the brake 1 having the above-described configuration, when the nut 35 screwed into the screw 33 of the bolt body 30 is loosened, (1) the bolt body 30 is slid vertically in the bolt body insertion hole 29. The position of the brake shoe 15 in the vertical direction (direction of arrow A in FIG. 1) can be adjusted. (2) By rotating the bolt body 30 about its axis, the position of the brake shoe 15 in the direction of arrow B in FIG. 1 can be adjusted. (3) Further, by rotating the bolt body 30 in the arrow E direction, the inclination of the brake shoe 15 in the arrow E direction can be adjusted.

The adjustment work of the above (1) to (3) is performed by loosening the nut 30, but at this time, unless the mounting shaft fixing means 8 is released, the brake shoe 15 and the bolt body 30. And are adjusted integrally. Therefore, the work can be performed without changing the relative position of the brake shoe 15 to the bolt body 30.

On the other hand, when the tightening screw 41 of the mounting shaft fixing means 38 is loosened, the fixing of the mounting shaft 37 to the bolt body 30 is released. Thereby, (4) by adjusting the insertion amount of the mounting shaft 37 into the mounting shaft holding hole 36, the mounting position of the brake shoe 15 in the arrow C direction can be adjusted. (5) Further, the inclination of the brake shoe in the direction of arrow D in FIG. 2 can be adjusted by rotating the mounting shaft around the shaft. In this case, if the nut 35 of the bolt body 30 is tightened, only the adjustment work of the above (4) and (5) can be performed independently of the other adjustment work described above.

Therefore, when adjusting the position of the brake shoe 15, unlike the conventional brake, it is not necessary to simultaneously perform the adjustment in the directions (1) to (5). Therefore, at the shipping stage, etc., the fixing of the bolt body 30 is released, and the initial adjustment operation at the time of installing the brake described in (1) to (5) above is performed, while the mounting shaft fixing means 38 is released. By doing so, the adjustment when the brake rubber of the brake shoe 15 described in (4) to (5) above is worn, or the mounting adjustment when the brake shoe 15 is replaced, can be performed as described in (1) to (3) above. The adjustment work described in () can be performed independently.

Accordingly, when the brake rubber is worn like the conventional brake mounting structure, when the brake is adjusted, the adjustment bolt with respect to the frame of the mounting bolt 30 is moved to adjust all positions. There is no need to start over from the beginning. Therefore, the position of the brake shoe can be adjusted extremely easily.

The scope of the present invention is not limited to the above embodiments. In the embodiment, the brake according to the present invention is adopted as the cantilever brake, but it can also be applied to the side-pull caliper brake. Further, in the embodiment, a split groove 39 communicating with the mounting shaft holding hole 36 is provided, and a tightening screw 41 for tightening the mounting shaft 37 inserted into the mounting shaft holding hole 36 so as to cross the split groove 36. Although it was fixed by pinching with the fixing screw, as shown in FIGS. 5 and 6, a fixing screw portion 42 was formed in front of the large diameter portion 32 provided with the mounting shaft holding hole 36, and the fixing screw portion 42 was formed. The nut 43 and the fixed washer 44 screwed to the portion 42 fix the mounting shaft 37 by pressing the portion of the mounting shaft 37 extending from the mounting shaft holding hole 36 against the inner surface of the mounting shaft holding hole. The means 38 can also be configured. Further, in the embodiment, the bolt body insertion hole penetrating in the front-rear direction of the vehicle body is provided, but the bolt body insertion hole penetrating in other directions may be adopted.

[Brief description of drawings]

FIG. 1 is a front view when a brake according to the present invention is applied to a cantilever brake.

FIG. 2 is a side view of the brake in FIG. 1 viewed from the direction of arrow II.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.

FIG. 5 is a front view showing another embodiment of the brake according to the present invention.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is an exploded perspective view showing a conventional example.

FIG. 8 is a cross-sectional view showing a conventional example and is a drawing corresponding to FIG.

[Explanation of symbols]

 10 Bicycle brake 12 Frame 15 Brake shoe 16 Brake arm 28 Brake shoe attachment part 29 Bolt body insertion hole 30 Bolt body 33 Peripheral screw 35 Nut 36 Mounting shaft holding hole 37 Mounting shaft 38 Mounting shaft fixing means

Claims (1)

[Scope of utility model registration request] 1. A pair of brake arms, each of which is swingably supported with respect to a bicycle frame, has a through-hole-like bolt body insertion hole at each brake shoe attachment portion, and a diametrically-through attachment at one end thereof. A shaft holding hole, a bolt body having an outer peripheral threaded portion at the other end, and the mounting shaft holding hole and the screw portion are exposed in the front and rear of the brake shoe mounting portion in the bolt body insertion hole. The brake shoe is configured to be adjustably attached to the brake arm by loosely inserting and holding the attachment shaft protruding from the back surface of the brake shoe through the attachment shaft holding hole of the bolt body. In a bicycle brake, the bolt body is fixed to the brake arm by screwing a nut onto the outer peripheral thread portion, while the mounting shaft is fixed. A bicycle brake characterized in that the mounting shaft inserted into the holding hole is fixed to the bolt body by mounting shaft fixing means provided in the bolt body.