JPS6280186A - Caliper brake for bicycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a bicycle caliper brake installed on a competition bicycle or an assembled bicycle, and more specifically, the distance between a pair of brake shoes can be adjusted with one touch in order to easily and quickly change wheels. The present invention relates to an improvement in a caliper brake configured to be able to expand by a predetermined amount.

[Conventional technology]

As a caliper brake for a bicycle, a so-called side-pull type caliper brake is generally used. First, the basic structure of this side-pull type caliper brake will be explained with reference to FIG. A first brake arm 2 and a second brake arm 3, which extend in a curved manner so as to sandwich the tires or rims of the wheels from both sides, are each swingably supported on a support shaft 1 attached to an appropriate part of the vehicle body. Arm 2, 3
A brake shoe 7.8 is attached to the tip of each of the brake shoes 7.8. Furthermore, these brake arms 2, 3 are always elastically biased by a spring 6 in a direction in which the brake shoes 7.8 are moved away from each other, that is, in a direction in which the brake is released. Then, the end of the inner wire W1 is fixed to the actuating arm part 4 that extends to the opposite side of the support shaft 1 in the first brake arm 2, and extends obliquely upward from the connected part of the second brake arm 3. The end portion of the outer wire w2 is properly attached to the actuating arm portion 5. When a brake operating lever (not shown) is operated, the inner wire w1 is pulled in the direction of arrow P, and as a result, both actuating arm portions 4.5 are forcibly brought close to each other. The pair of brake shoes 7.8 pinch the side surfaces of the rim to perform a braking action. On the other hand, if you loosen the pressure on the brake operating lever,
Both brake arms 2.3 return in the direction of the arrow q due to the elasticity of the spring 6, and the inner wire wl is pulled out in the direction of the arrow Q. By the way, the opening degree of the brake arm 2°3 in the normal state, that is, the distance between the two brake shoes 7.8, is such that the distance between the brake shoe 7.8 and the rim side surface is as large as possible in order to improve braking responsiveness. It is set to be smaller. As a result, as shown in FIG. 1, the distance between the brake shoes 7.8 is smaller than the width of the tire, so that the tire cannot be removed through the gap between the brake shoes 7.8. Furthermore, it is not possible to install a replacement tire by inserting it through the gap between the brake shoes 7 and 8. In a brake device equipped with an adjustment mechanism that adjusts the actual length of the inner wire w1 or the outer wire W2 by a screw means, the brake shoe 7.8 can be adjusted by adjusting the actual length of these wires W1, W2.
Although it is possible to temporarily widen the spacing between the brake shoes and remove the tires, it is easier and faster to widen the spacing between the brake shoes and remove the tires. It is required that exchanges be made possible. In order to meet such demands, a mechanism is provided that increases or decreases the opening degree of the pair of brake arms 2.3 by one-touch operation of a lever. As shown in FIGS. 1 and 2, this mechanism includes a rotating body that is rotated by a lever 25 inserted into a boss provided on the actuating arm 4 of the first brake arm 2, and the center of rotation of this rotating body. A fixing body for fixing the inner wire w1 is formed at a portion eccentric from the inner wire w1. Lever 2
5 to rotate the fixing body, the fixing point of the inner wire w1 relative to the actuating arm portion 4 can be moved up and down by a distance that is twice the eccentricity of the native body at the maximum. As a result, even if there is no relative movement between the inner wire w1 and the outer wire w2, relative rocking occurs in the operating arm portions 4.5 of both brake arms, and the brake shoe 7.8
The interval between will expand or contract. Furthermore, as shown in FIG. 1, from a state where the fastening body is located at the bottom dead center in the pulling direction of the inner wire W1, the lever 25 is moved along the arrow A in the figure.
When the fixed body is rotated in the direction shown in Fig. 2 to the top dead center, the space between the two operating arms 4 and 5 opens, and the brake arms 2 and 3 swing in the direction of the arrow q. As a result, the distance between the brake shoes 7 and 8 increases. In this state, the gap between the brake shoes 7.8 is wider than the width of the tire, so the tire can be removed or inserted through the gap between the brake shoes 7.8. After the replacement tire is installed on the vehicle body, simply return the lever 25 in the direction of arrow B and rotate it to return the brake arms 2, 3 or brake shoes 7.8 to their normal positions as shown in FIG. can do 1

[Problems to be solved by the invention]

By the way, with one touch like above, brake shoe 7
．． With the mechanism for expanding and contracting the interval 8, it was not possible to hold the fastening body at an intermediate position between its top dead center and bottom dead center. Since elastic tension is constantly applied to the inner wire wl by the spring 6, when the fixed body is between its top dead center and bottom dead center, the above tension is a force that rotates the fixed body toward the top dead center. This is because the fixing member rotates to the top dead center. On the other hand, if the lever 25 can be held in the middle of its rotation range, the distance between the brake shoe 7.8 and the rim side surface can be adjusted with one touch in response to wear of the brake shoe 78, or the brake By adjusting the distance between the shoe 7.8 and the rim side surface to the desired distance, you can select the feel of the brake operation, that is, the play 9 when gripping the brake operation lever, with a single touch, so the brake system The whole thing is very convenient and easy to use. In order to meet such requirements, in the conventional mechanism described above, the rotational resistance of the rotating body with respect to the boss portion is set to an extent that overcomes the elasticity of the spring 6 and the traction force applied to the inner wire w1 during braking. Although this can be achieved, the rotational resistance of the lever 25 will increase significantly, and the meaning of this mechanism itself, which involves one-touch operation of the lever 25 to expand or shorten the brake shoe spacing, will be diminished, and the resistance will increase. If it decreases, there is a risk that a braking failure condition will occur, which is not realistic. This invention was devised and made under the above-mentioned circumstances, and it not only solves the above-mentioned conventional problems and allows the distance between a pair of brake shoes to be increased or decreased with a single touch, but also enables To provide a bicycle caliper brake in which the interval between brake shoes can be adjusted to a desired amount with one touch.

[Means to solve the problem]

In order to solve the above-mentioned problem, in the present invention, a first brake arm having an actuation arm part to which the inner wire is fixed, and a second brake arm having an actuation arm part to which the outer wire is fixed, are respectively provided. The brake shoes attached to the tip are arranged so as to sandwich the wheel rim from the opposite side, and both brake shoes are supported so as to be swingable while being biased in the direction away from the rim relative to the support shaft of the vehicle body. On the other hand, a rotating body rotated by a lever is mounted on a boss provided in the operating arm portion of the first brake arm, and a jacket body to which the inner wire is connected is eccentric from the center of rotation of the rotating body. By providing the first brake arm and the second brake arm, when the lever is rotated and the fixed body is rotated between its top dead center and bottom dead center, the first brake arm and the second brake arm swing slightly. In the bicycle caliper brake configured as above, a ratchet pawl biased in the upright direction is provided on the outer periphery of the rotating body, and a ratchet tooth row that allows the ratchet pawl to engage with a predetermined portion of the inner circumferential surface of the boss portion. to form the
A ratchet mechanism is provided that allows the rotation of the rotating body only in the direction in which the fastening body moves from its top dead center to its bottom dead center, and a predetermined relative free rotation is provided between the lever and the rotating body. In addition, the lever is provided with a push part that causes the tip of the ratchet pawl to sink into the circular surface of the rotating body only when the lever is located at the end in the direction of top dead center within the range of the play. is forming.

[Effect]

A ratchet pawl biased in the upright direction is provided on the outer periphery of the rotating body, and a ratchet tooth row on the inner circumferential surface of the boss portion that can engage with the ratchet pawl is formed so that the rotation of the rotating body is controlled by the fastening body. A ratchet mechanism is provided that allows only the direction from the top dead center to the bottom dead center. Therefore, when the ratchet pawl is engaged with the teeth of the ratchet tooth row, tension is applied to the inner wire even if the fastening body is at an intermediate rotational position between its top dead center and bottom dead center. The fastening body does not inadvertently rotate toward the top dead center, and the traction force of the inner wire is reliably transmitted to the operating arm portion of the first brake arm via the fastening body. In addition, the ratchet mechanism allows rotation of the fixed body from the top dead center to the bottom dead center, so the lever is rotated to rotate the fixed body from the top dead center to the bottom dead center. be able to. Further, when the rotation of the lever is stopped on the way from the top dead center to the bottom dead center, the ratchet pawl engages with the ratchet tooth row as described above. On the other hand, a slight amount of play is provided between the lever for rotating the rotating body and the rotating body, so that the lever can rotate slightly relative to the rotating body in the circumferential direction. When this lever is located at the end of the play range in the direction of top dead center with respect to the rotating body,
A pushing portion is formed to cause the tip of the ratchet pawl to sink into the circumferential surface of the rotating body. When no operating force is applied to the lever, the lever is positioned toward the bottom dead center with respect to the rotating body, so the pushing part does not have the same effect, and the ratchet pawl elastically stands up so that it can be engaged with the ratchet teeth. However, when an operating force is applied to the lever to rotate it from the bottom dead center toward the top dead center, this lever will be located at the end of the play range in the top dead center direction, so the push portion will be ratcheted. Forcibly immerse the claw into the rotating body. As a result, Lache
7 The engagement between the pawl and the ratchet tooth row is released, and the rotating body or the fastening body becomes rotatable toward the top dead center. As a result of the above, by rotating the lever from the top dead center toward the bottom dead center, the fixed body can be rotated from the top dead center toward the bottom dead center. When attempting to rotate the lever in the direction, the ratchet mechanism is released and the fixed body can be rotated from the bottom dead center to the top dead center. When the rotor is stopped at the intermediate position and the operating force is released, the ratchet pawl engages with the ratchet tooth row to prevent rotation of the rotating body or the fixed body toward the top dead center. However, when an operating force is applied to the lever to rotate it toward the top dead center, the ratchet mechanism is released as described above, and the rotating body or the fastening body is rotated toward the top dead center.

【effect】

The rotating body or the fastening body to which the inner wire is fastened can be rotated from the top dead center toward the bottom dead center and from the bottom dead center toward the top dead center by operating the lever, so the brake shoe The interval can be expanded or contracted by a predetermined amount in one click. This allows tire replacement to be performed quickly and easily. Also, place the rotating body at the intermediate position between the top dead center and the bottom dead center of the fixed body.
Since the brake shoes can be reliably held by the engagement of the ratchet teeth of the ratchet pawl, it is possible to easily set the spacing between the brake shoes to any desired spacing within the expansion/contraction range obtained by rotating the fastening body. Therefore, in response to wear of the brake shoes, the distance between the brake shoes and the rim can be adjusted to an appropriate distance in one click by rotating the lever. Further, the play of the lever when the lever is held in the I position while operating the brake can be adjusted to the desired amount with a single touch by turning the lever.

[Explanation of Examples]

Embodiments of the present invention will be specifically described below with reference to the drawings. As shown in FIGS. 1 and 2, a first brake arm 2 and a second brake arm extend in a curved manner so as to sandwich the tire or rim of a wheel from both sides with respect to a support shaft 1 provided at a continuous portion of a bicycle body. 3 are swingably supported, and a brake shoe 7.8 is attached to the tip of each brake arm 2, 3, respectively. Further, these brake arms 2, 3 are always elastically biased by the return spring 6 in the direction in which the brake shoes 7.8 are moved away from each other, that is, in the direction in which the brake is released. The return spring 6 is a wire-shaped spring whose central portion 6a is fixedly held with respect to the support shaft 1.
b, 6c are respectively the first and second brake arms 2,
It is assembled by being hooked outward onto a protrusion IO formed near the tip of 3. Then, the end of the inner wire W1 of the double wire W, which is the operation wire, is attached to the inner wire fastening body 31 provided on the operating arm portion 4 extending on the opposite side of the support shaft 1 in the second brake arm 2. 3, the outer wire W2 of the wire W is fixed to the operating arm 5 whose southern part is extended obliquely upward. A boss portion 11 having a sling 11a at the middle portion in the thickness direction is provided at the tip of the operating arm 4, and a predetermined ratchet tooth row 12 is formed on the inner periphery of the boss portion 11. . A rotating body 13 that is rotatably inserted through the boss portion 11 and on which the inner wire fastening body 31 is formed is connected to a substantially round shaft-shaped main body portion 14 that passes through the boss portion 11 and to one end of this main body portion 14. It has a flange portion 15 made of Further, on the lower surface of the main body part 14, there are two
Abutment surfaces 18,19 at points are formed. A groove 16 having a cylindrical inner surface that is eccentric by a predetermined amount with respect to the axis of the main body 14 faces a portion located between the contact surfaces 18 and 19. It is connected to an eccentric circular hole 17 made in 15. Furthermore, a ratchet pawl that cooperates with the ratchet tooth row 12 to constitute a ratchet mechanism is provided in the southern part of the outer peripheral part of the main body part 14 so as to prevent the rotating body I3 from rotating in the direction of arrow A in FIG. 20 are partially buried. This ratchet claw 2
The proximal end 2Qa of 0 is formed to have an arcuate cross section, and the distal end 20
b is formed into an acute angle so that it can be ratcheted into the ratchet ridge. The ratchet claw 20 formed in this manner is housed in a notch 21 formed in the main body 14 so as to be able to swing up and down about the arcuate base 20a as a fulcrum. Further, the ratchet pawl 20 is always elastically biased in the upright direction by a winding spring 22 interposed between the ratchet pawl 20 and the notch portion 21. In addition,
A step portion 24 is formed at the end of the main body portion 14, into which a push plate 35, which will be described later, is fitted. The rotating body 13 described above is rotated by a lever 25 that fits into the rotating body 13 while being sandwiched between the slits lla of the boss portion 11. This lever 25 includes a ring portion 25a that is fitted onto the main body portion 14 of the rotating body 13, and an arm portion 25 that integrally extends outward in the radial direction from the ring portion 25a.
b. The inner hole 26 of the ring portion 25 is shaped so that it can rotate freely relative to the rotating body 13 by a predetermined angle. That is, the inner hole 26 has a circular arc portion that can fit on the outer periphery of the main body portion 14 of the rotating body, and a groove 16 having the cylindrical inner surface.
It has a recess 27 that escapes the shaft 33 of the inner wire fixing body 31, which is passed through, and step portions 28 and 29 that connect both sides of the recess 27 and the arcuate portion. The position of this step 28 , 29 is such that it cooperates with the abutment surface 18 , 19 provided on the body 14 side of the rotor 13 to define the end of the free movement of the lever 26 relative to the rotor 13 . established in In addition, the inner hole 26 is located at the end of the play range of the lever 25 with respect to the rotating body 13 in the direction of arrow B in FIG. 4 when the lever 25 is in the relative position shown in FIG. At this time, a notch 30 is provided for accommodating the ratchet pawl 20 protruding from the outer surface of the main body 14 of the rotating body. The edge of this notch 30 acts as a push part 30.11 which forces the ratchet pawl 20 into the body part 14, as shown in FIG. Function. The inner wire fastening body 31 for fastening the end of the inner wire w1 of the double wire W described above is a
1, and a shaft 33 that is inserted into the groove 16 of the rotating body 13 or the recess 27 of the inner hole of the lever 25, and is eccentric with respect to the axis of the rotating body 13. . The clamping part 32 includes a fixing part 32a that is integral with the shaft 33, and a clamping protrusion 32b that clamps the inner wire w1 with a set screw 32c. A vermilion shaft 33a is provided at the tip of the shaft 33. Furthermore, the push plate 35
A fitting hole 3 that fits into the step part 24 provided at the end of 3.
6, and the shaft 33 of the inner wire fixing body 31
It has a recessed part 37 through which it is inserted. Next, a method for assembling the above-mentioned mechanism to be provided at the end of the actuating arm section 4 will be explained. First, the ring portion 25a of the lever 25 is inserted into the slit lla of the boss portion II, and then the rotating body 13 is inserted into the inner hole 26 of the boss portion 11 and the lever 25. Here, the rotating body 13
A winding spring 22 and a ratchet pawl 20 are assembled at predetermined positions. And inner wire fixing body 31
The shaft 33 of
l 6 or the inner hole 26 of the lever 25, and this shaft 3
A nut 34 is screwed onto the threaded shaft 33a at the tip of No.3. Next, the operation of the above mechanism will be explained based on FIGS. 4 to 6. FIG. 4 shows a state in which the inner wire fixing body 31 is located at the bottom dead center. In this state, the upward tension of the inner wire W1 acting on the shaft 33 moves the rotating body 13 toward the top dead center.
That is, it does not act as a rotational force to rotate in the direction of the arrow. Further, even if such a rotational force acts, since the ratchet pawl 20 is engaged with the ratchet teeth 12, the rotating body 13 will not rotate in the direction of arrow A with respect to the boss portion 11. Next, when the lever 25 is relatively rotated in the direction of the top dead center of its free play with respect to the rotating body 13, that is, in the direction of the arrow A in the figure, as shown in FIG.
The push portion 30a formed in the inner hole 26 forces the ratchet pawl 20 into the inner surface of the rotary body 13, thereby releasing the ratchet pawl 20 from the ratchet tooth row 12. Therefore, when the lever 25 is rotated in the direction indicated by the arrow, the stepped portion 29 and the contact portion 19 contact each other, and the rotation of the lever 25 is transmitted to the rotating body 13.
3 rotates in the direction of arrow A. This allows the fastening body 31 to rotate to its top dead center. At this time, as shown in FIG. 2, the distance between the brake shoes 7.8 is widened. Note that the ratchet mechanism allows rotation of the rotating body 13 from the top dead center to the bottom dead center, that is, in the direction of arrow B.
By rotating the lever 25 in the direction of arrow B, the rotating body 13 or the fastening body 31 located at the top dead center position can be freely rotated toward the bottom dead center. Furthermore, when the rotating body I3 or the fixed body 31 is rotated to an intermediate position between the top dead center and the bottom dead center and the lever 25 is released, the lever 25 is moved by its own weight as shown in FIG. Located at the bottom dead center side end of the play range, the push portion 30a retreats and the ratchet pawl 20 stands up. Therefore, even if the tension of the inner wire W1 pulls the shaft 33 upward in the figure in this state, the shaft 33 or the rotating body 13 will move toward the top dead center,
That is, it cannot rotate in the direction of arrow A. Therefore, the rotating body 13 or the inner wire fixing body 31 is reliably held at any position within the rotation range from the top dead center to the bottom dead center, and braking operation is possible in this state. FIG. 7 shows another embodiment of the ratchet pawl 20. In this example, an arcuate portion is formed at the back of the tip of the ratchet pawl 20. In this way, the lever 25
When rotating the lever in the direction of arrow A, the pusher 30 strokes the back of the claw to cause it to sink into the inner surface of the rotating body 13, so the play of the lever 25 with respect to the rotating body 13 is increased to improve operability. can be increased. Furthermore, FIG. 8 shows another embodiment of the means for providing play between the lever 25 and the rotating body 13. In this example, an eccentric hole 38 is provided in the main body 14 of the rotating body 13, and the shaft 33 of the fastening body 31 is inserted through the eccentric hole 38, while an inward protrusion is provided in the inner hole 26 of the ring portion 25a of the lever 25. 37, and a recess /
136 is formed. Note that the scope of the present invention is of course not limited to the above-described embodiments. In particular, regardless of the type of caliper brake, as long as the caliper brake is configured to perform braking action by expanding and contracting a pair of brake arms, or an operating arm unit that is integral with these arms, by relative movement of an inner wire and an outer wire. , the mechanism featured by the present invention can be incorporated into the inner wire fixing portion. Further, the spring for urging the ratchet pawl constituting the ratchet mechanism can be replaced with an elastic body such as rubber. Further, the ratchet structure may be provided at any position on the outer periphery of the rotating body.

[Brief explanation of drawings]

FIG. 1 is a front view of the bicycle caliper brake of the present invention.
Fig. 2 is an explanatory diagram of the action, Fig. 3 is an exploded perspective view of the mechanism provided at the end of the operating arm, and Figs. 4 to 6 are explanatory diagrams of the action.
FIG. 7 is a diagram showing another embodiment of the ratchet pawl, and FIG. 8 is a diagram showing another embodiment of the means for providing play between the lever and the rotating body. 1... Support shaft, 2... First brake arm, 3...
Second brake arm, 4... Operating arm, 7.8...
- Brake shoe, 11... Boss part, 12... Ratchet tooth row, 13... Rotating body, 20... Ratchet pawl, 25... Lever, 30a... Push part, 31...
Fixing body (of the inner wire), wl...inner wire,
w2... Outer wire Figure 1 Figure 4

Claims (1)

[Claims] (1) A brake shoe attached to the tip of each of a first brake arm having an actuation arm to which the inner wire is fixed and a second brake arm having an actuation arm to which the outer wire is fixed is attached to the wheel. The rim is arranged so as to be sandwiched from opposite sides, and both brake shoes are supported so as to be able to swing while always being biased in a direction away from the rim with respect to the support shaft of the vehicle body. A rotary body rotated by a lever is inserted into the boss portion, and a fastening body to which the inner wire is connected is provided eccentrically from the center of rotation with respect to the rotary body, whereby the lever is rotated and the above-mentioned In the bicycle caliper brake, the first brake arm and the second brake arm are configured to swing slightly when the fixed body is rotated between its top dead center and bottom dead center. A ratchet pawl biased in the upright direction is provided on the outer periphery, and a ratchet tooth row with which the ratchet pawl can engage is formed at a predetermined portion on the inner peripheral surface of the boss portion,
A ratchet mechanism is provided that allows the rotation of the rotating body only in the direction in which the fixed body moves from its top dead center to its bottom dead center, and a predetermined relative free rotation is provided between the lever and the rotating body. In addition, the lever is provided with a push part that causes the tip of the ratchet pawl to sink into the circumferential surface of the rotating body only when the lever is located at the end in the direction of top dead center within the range of the play. A bicycle caliper brake characterized by a