JPS6219509Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a bicycle caliper brake device, and more specifically, it is a side-pull type, and is equipped with a posture correction means that ensures that the so-called brake width between the pair of left and right brake shoes and the rim is always at an appropriate value. The present invention also relates to the provision of a new brake device which is improved so as to be able to exert a braking action at the same time even if there is an unbalance in the operation transmission force that is unavoidable with Bowden cables.

A pair of brake arms each having a brake shoe that approaches and separates from the rim of a wheel are mounted on the shoulders of a handlebar post and supported by bolts, and a brake spring is provided that biases each arch in a direction away from each other, and the brake lever is provided on the handlebar. A bicycle caliper brake device that transmits the operating force from one side through a Bowden cable against a brake spring is known as a so-called side-pull type brake device.

By the way, in this type of brake device,
Due to brake shoe wear, tire puncture, etc., it is extremely difficult to temporarily change the relative positional relationship between the brake arm and the rim, and then reassemble it in the correct position because the brake spring holder is fixed on the bolt. Not only is it difficult to replace, requiring many years of experience and advanced technology, but replacing it is also a very troublesome task.

In particular, when a tire puncture occurs on a competition bicycle, it is necessary to replace it as soon as possible, but if the rim and brake shoe are not properly centered after the tire is replaced, a serious accident can occur. It will provoke.

Therefore, if the brake spring holder is fitted so that it can rotate freely around a fixed axis, the brake spring itself can rotate independently without being restrained, and this can be done by operating the brake operating means in the braking direction. Although it is possible to return to the proper position, such a configuration is essentially meaningless if the operational transmission force of the Bowden cable consisting of the inner wire and the outer wire becomes unbalanced.

Now, if we assume that the outer wire transmits the operation transmission force more strongly than the inner wire, the second arm corresponding to the outer wire will perform a unilateral braking operation, and in this case, the brake spring is designed to control this. Since it is not supported, the other first arm remains on the other side, which may cause one brake shoe to move to one side or cause trouble in driving, and also makes it difficult to center each brake arm. This tendency is particularly problematic in bicycle rear wheel brakes where the Bowden cable must connect the brake lever and the braking means through a bend.

The present invention is a bicycle side-pull type caliper brake device equipped with the above-mentioned posture correction means, in which an adjusting means consisting of a screw and a pinion is assembled, and the operation thereof can be made light, smooth, and easy. The feature is that the first arm 1 is disposed between the wheel and the car loading platform A, and is equipped with brake shoes 3 and 6 that come into contact with and separate from the rim 8 of the wheel.
and a second arm 4 are each swingably held around a fixed shaft 7 attached to the vehicle body side, and a brake spring 19 is provided which biases each arm 1, 4 in a direction away from each other. An outer wire 16 is attached to one arm, and an inner wire 17 is attached to the other arm 4.
In the caliper brake device, in which the separator flange 28 is fixed at the intermediate portion of the axial length of the fixed shaft 7, the first arm 1 and The second arm 4 is held in an overlapping manner, and the spring holder 21 is fitted and held in a relatively rotatable manner on the front half of the fixed shaft 7 between the arms 1 and 4 and the separator flange 28. The arch center portion of a brake spring 19 having an arch shape is held at one end surface in the axial direction of the brake spring 21, and both arch ends of the brake spring 19 are engaged with the first arm 1 and the second arm 4, respectively, so that each arm 1, 4 in the direction away from each other, and further, the adjuster holder 25 is immovably fitted around the shaft on the fixed shaft 7 in the latter half of the separator flange 28, and the adjustment tool holder 25 is pushed to one side from the fitting part. An adjusting tool 32 having a screw shaft 34 is rotatably inserted and carried in the height direction of the vehicle body on the protruding adjusting tool holder 25, and the spring holding portion 22 of the spring holder 21 is connected to the shaft. A fan-shaped pinion 36 formed at an extending end of an arm extending to one side from the outer circumferential part in a direction apart is connected to the adjusting tool 3.
It is at the point where it engages with the screw shaft 34 of No. 2.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a first brake arm called a small arch or Y-arch, which has a brake shoe 3 at one end thereof via a holder 2. 4 is the second arch called the large arch or C-shaped arch.
The brake arm has a brake shoe 6 at one end thereof via a holder 5.

The other end of the first brake arm 1 and the middle of the second brake arm 4 are overlapped with each other and held on a fixed shaft 7 for attaching the brake device to the vehicle body so as to be able to swing freely around the shaft. In this case, the separator flange 28 is held in the front half of the separator flange 28 which is integrally formed in the middle part of the fixed shaft 7 in its axial length.

At this time, each brake shoe 3, 6 is arranged to correspond to the rim 8 of the wheel. Each brake shoe 3, 6 is made of abrasion-resistant rubber block, and the bolt 9 is inserted in the guide hole 10 shown in FIG.
By loosening, the wheel can be adjusted in the radial direction.

Further, the first brake arm 1 has an overhanging arm 11 in the middle thereof, and a connector 13 for screwing the outer holder 12 is attached to the tip of the arm 11.

The outer holder 12 has a cylindrical shaft and is screwed onto the connector 13, and 14 is a screw adjustment body fitted onto the holder 12. Furthermore, a connector 15 for an inner wire is attached to the other end of the second brake arm 4.

Outer wire 1 of Bowden cable 18 consisting of outer wire 16 and inner wire 17
6 is attached to the outer holder 12, and the inner wire 17 is inserted through the outer holder 12 and connected with the connector 15.

Reference numeral 19 denotes a brake spring, which has an arch-like overall shape, and has a pair of winding parts 20 on both shoulders of the arch to promote elasticity. Reference numeral 21 denotes a cylindrical spring holder, which has a radial holding part 22 on one end surface in the axial direction, and has an arm extending to one side on the outer periphery apart from the holding part 22 in the axial direction. A fan-shaped pinion 36 is formed at the extending end of the arm, and this spring holder 21 is fitted around the fixed shaft 7 so as to be relatively rotatable around its axis. In the example, it is fitted onto the front half of the fixed shaft 7 between the first arm 1 and the first arm 1.

At this time, it is preferable to fit a bushing or other bearing body (not shown) onto the fixed shaft 7, and fit the holder 21 onto this bearing body to reduce the rotational frictional force of the holder 21.

The arch center portion of the brake spring 19 is engaged with the holding portion 22 of the holding body 21, and each arch end portion 19a, 19b of the spring 19 extends symmetrically with respect to the fixed axis 7, so that the first arm 1 and the second arm 4 are connected to each other. It engages from the inside with protrusions 23 and 24 formed on each back surface, thereby urging the brake shoes 3 and 6 in a direction away from each other.

Reference numeral 25 denotes an adjustment tool holder, which is in the form of a tilted channel as shown in FIG.
7, which is fitted in the rear half of the separator flange 28 provided at the middle part of the axial length of the fixed shaft 7, and
The overhang portion 26 of the adjuster holder 25 is superimposed on the adjuster holder 25 via the washer 29, and the adjuster holder 25 is immovable around the fixed shaft 7. That is, in the embodiment, an engaging surface 30A is formed on the fixed shaft 7 in the longitudinal direction of the shaft, an engaging portion 30B is formed in the mounting hole 27, and the mounting hole 27 is fitted onto the fixed shaft 7.
By locking 0A and the engaging portion 30B, the holding body 2
5 remains stationary around a fixed shaft 7.

Further, holes 31 are formed in each flange of the holding body 25 in correspondence with each other, as shown in FIG. 32
is an adjustment tool consisting of a knob 33 and a screw shaft 34,
A screw shaft 34 passes through the hole 31 and is provided in the height direction of the vehicle body, and a knob 33 is supported on the flange. A thrust stopper 35 is attached to the screw shaft 34.

A fan-shaped pinion 3 is formed at an extending end of an arm extending from the spring holder 21 in a lateral protruding manner.
6 is engaged with the screw shaft 34. A is the car carrier mounted above the wheels, B is its support, and in order to avoid any problems even if these are present, the adjuster holder 25 is placed on one side of the fixed shaft 7 as shown in FIG. It is unevenly distributed.

In addition, in the figure, 37 is a friction washer, 6-
It is made of nylon resin or the like and is interposed between the base of the first arm 1 and the spring holder 21. 38
is a washer, which is interposed between the overlapping portion of the first arm 1 and the second arm 4. 39 is two washers and 2
It is a threaded assembly consisting of two nuts, and is threaded onto the threaded portion 7a of the fixed shaft 7. 40 is a pair of holders,
The rear fork is held in place when applying the rear brake, and the front fork is held in place when the front brake is applied, and the nut 41 is screwed onto the other threaded portion 7b of the fixed shaft 7, thereby attaching the fixed shaft 7 to the vehicle body.

In the above configuration, the brake width L between the brake shoes 3, 6 and the rim 8 is normally considered to be approximately 2 m/m, but as shown in the solid line position in Fig. 1, each brake shoe 3, 6 and the rim 8 If the assembly position is such that there is a difference in the distance between the two, when the inner wire 17 of the Bowden cable 18 is pulled into the braking position, the one with the smaller distance will naturally come into contact with the rim 8 first, and Here, a so-called undesirable one-sided brake is applied. In such a case, in the embodiment of the present invention, the inner wire 17 is
Even if there is a difference in the distance between the brake spring holders 21 and the fixed shaft 7, if each shoe 3, 6 is pulled strongly until it comes into contact with the rim 8 and then the pulling force is released, the brake spring holder 21 can be moved to the fixed shaft 7.
The rim 8 After making contact with the rim 8, the shoes 3 and 6 are separated by an equal width, and the attitude of the brake device is properly corrected with respect to the rim 8, as shown by the chain line in FIG.

At this time, the bowden cable 18 has a curved path 18
a, the outer wire 16 tends to transmit the operation transmission force more strongly than the inner wire 17, and the first wire corresponding to the outer wire 19
Since the arm 1 is unilaterally braked and the brake spring 19 is not supported to control this, the second arm 4 is left behind, and the brake is operated in the braking direction. , even if this is canceled, proper centering may not be guaranteed. In addition, the inner wire 17
If the transmission force of the outer wire 16 is large and the transmission force of the outer wire 16 is small, the opposite may occur and proper centering may not be possible. In such a case, since the adjustment margin for centering is minute, it is necessary to make the adjustment finely by a separate means.

In such a case, in the present invention, the knob 33 of the adjusting tool 32
When the screw shaft 34 is engaged with the pinion 36, the screw shaft 34 is engaged with the pinion 36, so that the spring holder 21 is rotated forward and reverse around the fixed shaft 7, and the spring holder 21 is rotated forward and reverse around the fixed shaft 7. Then, the screw feeding force of the adjusting tool 32 is transmitted to the brake spring 19 to perform fine adjustment.

At this time, the adjustment tool holder 25 and the spring holder 21
is divided into a front half and a rear half by the separator flange 28 on the fixed shaft 7, and not only the screw shaft 34 but also the adjuster holder 25 and the spring holder 21 which is rotatable on the fixed shaft 7 are in sliding contact with each other. Because there are no screw shafts 34 and fan-shaped pinions, it is possible to easily adjust the spring 19 while correcting variations in the spring 19 without causing malfunctions caused by mutual sliding between the spring holder 21 and the adjuster holder 25. 36 are engaged, even if the spring holder 21 is angularly displaced, reliable engagement can be maintained, and the screw shaft 34
By meshing the pinion 36 with the pinion 36, in addition to the arm length up to the meshing part, light operation can be achieved by the meshing ratio. Since it extends to one side from the screw shaft 34, the meshing portion with the screw shaft 34 does not interfere with the spring 19.

Further, this fine adjustment can also be carried out by providing a pair of left and right adjustment tools 32 and having them act on each arm 1, 4, but this will not only cause damage to the arms 1, 4, but also cause damage to the arms 1, 4.
Although variations in the brake spring 19 itself cannot be corrected, as mentioned above, by applying the screw feed of the adjuster 32 to the spring holder 21, the arms 1 and 4 will not be damaged and the variations in the spring 19 can be corrected. It can be fixed.

In addition, since the adjustment tool 32 is unevenly distributed on one side of the fixed shaft 7, there is no problem even if there is a car loading platform A, and in particular, the adjustment tool holder 25 is fitted onto the fixed shaft 7 so that the adjustment tool holder 25 does not rotate relative to the fixed shaft 7. Since the adjustment tool 32 is attached to the adjustment tool holder 25, the position of the adjustment tool 32 does not move, and therefore adjustment work can be performed in a fixed position, and interference with the car loading platform A side during adjustment is avoided. It can be prevented and is easy to operate. Further, since the screw is fed, the fine adjustment means can be constructed with a small number of parts.

The present invention is as described above, and in short, a first arm and a second arm, which are arranged between a wheel and a car loading platform and are equipped with a brake shoe that approaches and separates from the rim of the wheel, are each mounted around a fixed shaft attached to the vehicle body. A caliper brake device including a brake spring that is swingably held and urges each arm in a direction away from each other, and in which an outer wire is connected to one of the arms and an inner wire is connected to the other arm, A separator flange is fixedly provided at an intermediate portion of the axial length of the fixed shaft, the first arm and the second arm are held superimposed on the fixed shaft in the front half of the separator flange, and the arm and the separator flange are A spring holder is fitted and held in a relatively rotatable manner on the front half of a fixed shaft between the spring holder, and the arch center portion of the brake spring having an arch shape is held at one end surface in the axial direction of the spring holder. Both ends of the arch of the spring are engaged with the first arm and the second arm, respectively, to bias each arm in a direction away from each other, and further, the adjuster holder is moved around the fixed axis on the rear half of the separator flange. The adjusting tool is fixedly fitted into the mantle, and an adjusting tool having a screw shaft is rotatably inserted in the height direction of the vehicle body on the adjusting tool holder that protrudes from the mantle fitting part to one side. and a fan-shaped pinion formed at an extending end of an arm extending to one side from an outer peripheral portion axially distant from the spring holding portion of the spring holding body is engaged with the screw shaft of the adjusting tool. Therefore, it has the following advantages.

The adjuster holder and the spring holder are divided into the front and rear parts by the separator flange on the fixed shaft,
Since the screw shaft and the adjustment tool holder do not come into sliding contact with the brake spring holder, spring variations can be corrected without causing malfunctions caused by mutual sliding between the spring holder and the adjustment tool holder. Can be adjusted. In particular, the adjustment tool holder is fitted onto the fixed shaft so that it cannot rotate relative to the fixed shaft, and the adjustment tool is attached to the adjustment tool holder, so the position of the adjustment tool does not move and can therefore be adjusted at a fixed position. Easy to operate, prevents interference with the car loading platform during adjustment, and has good operability.

In addition, since the screw shaft and the fan-shaped pinion are engaged, reliable engagement can be maintained even if the spring holder changes angle, and the fan-shaped pinion is formed at the tip of the arm that extends from the spring holder. In addition to the engagement ratio between the screw shaft and pinion, the length of the arm allows for light operation, and the engagement part does not come off accidentally.Furthermore, the arm with the fan-shaped pinion is used to hold the spring of the spring holder. Since it is provided as a side protrusion at a position axially away from the meshing part, it can be easily assembled without mutual interference between the meshing part and the spring, and the desired purpose can be achieved effectively and reliably. It is very profitable.

[Brief explanation of the drawing]

Fig. 1 is a rear view of an example of a brake device according to the present invention, Fig. 2 is a side view, Fig. 3 is a side elevational view, and Fig. 4 is a rear view of an example of a brake device according to the present invention.
The figure is an enlarged sectional view taken along line 4-4 in FIG. 2, and FIG. 5 is an exploded perspective view. DESCRIPTION OF SYMBOLS 1... First brake arm, 4... Second brake arm, 3, 6... Brake shoe, 7... Fixed shaft, 8... Rim, 16... Outer wire, 17
... Inner wire, 18 ... Bowden cable, 19 ... Brake spring, 20 ... Winding part, 2
DESCRIPTION OF SYMBOLS 1... Brake spring holder, 25... Adjuster holder, 32... Adjuster, 34... Screw shaft, 36
...Pinion.

Claims (1)

[Scope of utility model registration request] The rim 8 of the wheel is placed between the wheel and the car loading platform A.
A first arm 1 and a second arm 4 each having brake shoes 3 and 6 that move toward and away from each other are held swingably around a fixed shaft 7 attached to the vehicle body, and the arms 1 and 4 are separated from each other. In the caliper brake device, which is equipped with a brake spring 19 biased in the direction, and in which an outer wire 16 is connected to one of the arms 1 and an inner wire 17 is connected to the other arm 4, an intermediate portion of the axial length of the fixed shaft 7 is provided. A separator flange 28 is fixed to the separator flange 28, and the first arm 1 and the second
The arms 4 are held one on top of the other, and the spring holder 21 is fitted and held in the front half of the fixed shaft 7 between the arms 1 and 4 and the separator flange 28 so as to be relatively rotatable. The arch center portion of the brake spring 19, which has an arch shape on one end surface in the axial direction, is held, and both arch ends of the brake spring 19 are held at the first end.
is engaged with the arm 1 and the second arm 4 to urge the arms 1 and 4 away from each other;
The adjuster holder 25 is fixedly fitted around the shaft on the fixed shaft 7 in the latter half of the separator flange 28, and the screw shaft is mounted on the adjuster holder 25 projecting to one side from the separator flange 28. 34 is rotatable around its axis and is inserted and supported in the height direction of the vehicle body, and is extended to one side from an outer peripheral portion of the spring holder 21 that is axially distant from the spring holder 22. A side-pull type caliper brake device for a bicycle, characterized in that a fan-shaped pinion 36 formed at the extending end of the arm is engaged with a screw shaft 34 of the adjusting tool 32.