JPH0150773B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a bicycle caliper brake device, more specifically a side-pull type, in which the so-called brake width between the left and right brake shoes and the rim is always at an appropriate value. The present invention relates to the provision of a new brake device which is equipped with a posture correction means and which is improved so that it can simultaneously exert a braking action even if there is an imbalance in operation transmission force that is unavoidable with Bowden cables.

(Prior art) A pair of brake arms each having a brake shoe that approaches and separates from the rim of a wheel is attached to, for example, 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. A bicycle caliper brake device that transmits the operating force of a brake lever equipped with a brake lever from one side through a Bowden cable against a brake spring is known as a so-called side-pull system. A technology equipped with an adjustment means in the event that the desired braking force decreases due to elongation, etc.
Some of these are disclosed in Publication No. 31623 and Japanese Patent Publication No. 53-6416.

(Problems to be Solved by the Invention) However, in all of the above-mentioned prior art, after the brake arms are set (assembled) so that the positions of the left and right brake shoes are equidistant from the wheel rim, This adjustment means does not give any consideration to centering when assembling the brake arm, that is, the brake device.

(Problem to be Solved by the Invention) Therefore, in order to properly center the brake device, if the brake spring holder is fitted around the brake mounting axis so that it can rotate freely, the brake spring itself will not be restrained. It can rotate independently, and the brake shoe can be returned to the proper position by operating the brake operating means in the braking direction, but even with this configuration, the operation transmission force of the Bowden cable consisting of the inner wire and outer wire is limited. If there is an imbalance, it becomes virtually meaningless.

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 also occurs in bicycle front wheel brakes, but it is particularly problematic in bicycle rear wheel brakes where the Bowden cable must connect the brake lever and the braking means through a bent portion.

The present invention provides a brake that automatically guarantees proper centering by operating the brake lever in the braking direction even if the centering of the rim and brake shoe is not proper, and also allows for fine adjustment of the centering. The purpose is to provide equipment.

In addition, the fine adjustment of centering can be carried out reliably and smoothly by screw feeding, and in order to provide the means for this fine adjustment, the axial length of the brake mounting shaft does not need to be significantly longer. For the purpose of providing.

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above object are characterized by a first arm and a second arm each having a brake shoe that approaches and separates from the rim of the wheel. are each held swingably around a brake mounting axis, and each arm is provided with a brake spring that urges them in a direction away from each other, an outer wire is connected to one of the arms, and an inner wire is connected to the other arm. The arch top of the brake spring having an arch shape is held in a spring holder fitted around the axis of the brake mounting shaft so as to be relatively rotatable, and both ends of the arch of the brake spring are connected to the first arm and the second arm. In a side-pull type caliper brake device in which the arms are engaged with each other and biased in a direction away from each other, an adjuster holder is provided on the brake mounting shaft so as to be unrotatable about the axis, and the adjuster holder includes: It has a flat plate-shaped mounting part whose plate thickness is reduced in the axial direction of the brake mounting shaft, and this flat plate-shaped mounting part is fitted over the brake mounting shaft and extends to one side intersecting the mounting shaft and extends upward. It has a flat plate-shaped rising part and a flat plate-shaped support part for attaching an adjuster extending from the upper side of the flat plate-shaped rising part in the axial direction of the brake mounting shaft, and is L-shaped in side view. It has a part,
Furthermore, the adjustment tool has a screw hole for adjusting the elastic force of the brake spring, and a screw shaft is screwed into the screw hole of the adjustment tool, and the vertical shaft is supported by the flat support portion of the holder. The adjustment device is equipped with an adjuster that is rotatable around the center but cannot be moved vertically relative to the support portion, and fine adjustment means using a screw feed.

(Function) The first and second brake arms 1 and 4 having the brake shoes 3 and 6 are assembled together with the brake spring 19 on the brake mounting shaft 7. In this assembly, 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. 7, each brake shoe 3, 6 is If the assembly position is such that there is a difference in the distance between the rim 8 and the rim 8, the inner wire 17 of the Bowden cable 18
When the rim 8 is towed into a braking position, the one with the smaller distance naturally contacts the rim 8 first, and an undesirable one-sided brake is applied there. In such a case, in the present invention, the inner wire 17 is
In other words, even if there is a difference in the distance between the shoes 3 and 6, if the shoes 3 and 6 are pulled strongly until they contact the rim 8 and then the pulling force is released, the brake spring holder 21 will be attached to the mounting shaft 7. Since the brake spring 19 held by the brake spring 19 can apply an equal restoring force to the first and second arms 1 and 4, the rim 8 After contact, 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 16
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.

Furthermore, during assembly, although the centering is almost perfect, it may be necessary to make slight adjustments.

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, when the grip 31a of the adjuster 31 is rotated in the forward or reverse direction around its axis, the screw shaft 31c is screwed into the adjuster 29, so the adjuster 29 rotates in either the forward or reverse direction. Under the feeding action,
In addition, since the adjuster 29 engages with the brake spring 19, whether directly or indirectly, the screw feeding force of the adjuster 31 is transmitted to the brake spring 19 to perform fine adjustment. In addition, this fine adjustment is achieved by providing a pair of left and right adjusters 31 for each arm 1 and 4.
This can also be done by applying a screw feed force to the brake spring 19, but this will damage the arms 1 and 4 and will not correct the variations in the brake spring 19 itself. By acting on the brake spring 19 via the tool 29, the arms 1 and 4 are not damaged, and variations in the spring 19 can be corrected.

(Embodiment) In FIGS. 1 to 3, reference numeral 1 denotes a first brake arm called a small arch or a Y-shaped arch, and 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 by a brake mounting shaft 7 for mounting the brake device on the vehicle body, and are swingable around the axis of the shaft 7. 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 spring holder, which has a cylindrical shape and has a radial holding portion 22, and is fitted around the mounting shaft 7 so as to be relatively rotatable around its axis. At this time, it is better to fit a bushing or other bearing body 23 onto the mounting shaft 7 as shown in FIG. desirable.

Arch center portion (top) of the brake spring 19
is engaged with the holding part 22 of the holding body 21, and the spring 19
The ends 19a and 19b of the arch extend symmetrically with respect to the mounting shaft 7 and engage from the inside with projections 24 and 25 formed on the back surfaces of the first arm 1 and the second arm 4, so that the brake shaft 3 , 6 are urged in directions away from each other.

Reference numeral 26 denotes a fine adjustment means, which is immovably provided around the axis of the mounting shaft 7 and includes an adjuster holder 27 having a guide portion 28 of the adjustment tool, and the brake spring 1.
Preferably, one end of the threaded hole 30 is inserted and engaged with the winding portion 20 of No. 9, and the other end is engaged with the guide portion 28.
and a screw hole 30 of the adjuster 29.
The holder 27 has an annular mounting portion 27a superimposed on the rear end surface of the large diameter portion 7a of the mounting shaft 7, and the holder 27 has an annular mounting portion 27a superimposed on the rear end surface of the large diameter portion 7a of the mounting shaft 7. In this embodiment, the fixed shaft 7 is formed with an engaging surface 32 in the axial direction, while the mounting portion 27a
The insertion hole 33 is fixed to a so-called oval hole or the like as shown in FIGS. 4 and 5. In this position, the rising portion 27b of the holding body 27 is made to project laterally, and the upper side of the rising portion 27b is bent to form a supporting portion 27c.

That is, the adjuster holder 27 is
As shown in detail in the figure, the brake mounting shaft 7 has a flat plate-like mounting portion 27a whose plate thickness is reduced in the axial direction, and the flat plate-like mounting portion 27a is fitted onto the brake mounting shaft 7. It is immovable around the mounting shaft 7 and extends to one side intersecting the mounting shaft 7.

Further, the extending end side of the flat mounting portion 27a has a flat rising portion 27b rising upward, and
This flat plate-like rising portion 27b has a flat support portion 27c extending from the upper side in the axial direction of the brake mounting shaft 7 to which the adjuster 31 is attached, and has an L-shaped portion when viewed from the side.

Further, in the drawings of the embodiment, the guide portion 28 is formed vertically through the rising portion 27b in the front-rear direction, and a notch 34 is provided in the supporting portion 27c.

The shaft portion 29a of the adjustment tool 29 is engaged with the guide portion 28 and is prevented from coming off by caulking the collar body 35, so that it is movable in the vertical direction but cannot be moved in the front and back direction, and the adjustment tool 29 can be adjusted. A flat surface 29c is formed on the upper surface of the main body of the tool 29, and another shaft portion 29b is formed.
is inserted into and engaged with the winding portion 20 of the brake spring. The adjuster 31 is assembled via the notch 34 so that the support portion 27c is sandwiched between the end surface of the cap-shaped grip 31a and the collar body 31b.
It is rotatable around the vertical axis but not movable in the vertical direction, and its screw shaft 31c is screwed into the screw hole 30 of the adjuster 29, and the grip 31a of the adjuster 31 is manually operated. When the brake spring 19 is rotated in the forward and reverse directions, the adjusting tool 29 is threaded within the range of the guide portion 28, and the spring force (elastic force) of the brake spring 19 is appropriately finely adjusted.

In addition to the hole structure, the guide portion 28 has a raised portion 2.
It can also be constructed from the rising surface of 7b itself.

Additionally, in the figure, a washer 36 is interposed between the brake holding body 21 and the large diameter bolt portion 7a.

A friction washer 37 is made of 6-nylon resin or the like and is interposed between the base of the first arm 1 and the spring holder 21. A washer 38 is interposed between the overlapping portion of the first arm 1 and the second arm 4. Reference numeral 39 is a threaded assembly consisting of two washers and two nuts, and is threaded onto the threaded portion 7b of the mounting shaft 7.
Reference numeral 40 designates a pair of holders, which hold the rear fork when the rear brake is used as shown in FIG. 3, and the front fork when the front brake is used as shown in FIG.
A nut 41 is screwed onto the other threaded portion 7c, and the mounting shaft 7 is attached to the vehicle body.

(Effect of the invention) According to the invention, the first brake arm and the second
A holder that holds a brake spring that is engaged with a brake arm is rotatably fitted onto the brake mounting shaft, and Bowden cables are connected to the first and second brake arms, so that the brake arm can be attached to the wheel rim. The fine adjustment of the centering can be carried out by finely adjusting the elastic force of the brake spring by rotating the adjuster and threading the adjuster.

The mounting part of the adjuster holder, which is provided on the brake mounting shaft so that it cannot rotate around the axis, is a flat plate with a thinner plate in the axial direction of the brake mounting shaft. There is no need to make the length of the mounting shaft particularly long to equip the body. Furthermore, even if the mounting part of the holder is flat, the mounting part has a flat plate-shaped rising part that extends to one side intersecting the mounting axis and rises upward, and the flat plate-shaped rising part Since it has a flat support part for attaching the adjuster extending from the upper side in the axial direction of the brake mounting shaft and has an L-shaped part in side view, even though the mounting part is made into a flat plate shape. The adjuster can be mounted securely, the adjuster can be easily operated, and the brake spring can be finely adjusted by threading the adjuster, and the structure is simplified. can.

[Brief explanation of drawings]

FIG. 1 is a rear view of an example of the brake device according to the present invention, FIG. 2 is a side view, FIG. 3 is a plan view when the device is installed on the rear fork, and FIG. 4 is a perspective view of the fine adjustment means.
FIG. 5 is an exploded perspective view, FIG. 6 is a cross-sectional view of the main parts installed on the front fork, and FIG. 7 is a rear view showing the corrected state. DESCRIPTION OF SYMBOLS 1...First brake arm, 4...Second brake arm, 3, 6...Brake shoe, 7...Mounting shaft, 8...Rim, 16...Outer wire, 17
... Inner wire, 18 ... Bowden cable, 19 ... Brake spring, 21 ... Brake spring holder, 26 ... Fine adjustment means, 27 ... Adjustment tool holder, 27a ... Mounting part, 27b ... Rise Part, 27c... Carrying part, 29... Adjustment tool, 30...
...screw hole, 31...adjuster, 31c...adjustment screw shaft.

Claims (1)

[Scope of Claims] 1. A first arm and a second arm each having a brake shoe that approaches and separates from the rim of a wheel are each held swingably around a brake mounting axis, and each arm is attached in a direction away from each other. Equipped with a reinforced brake spring,
An outer wire is connected to one of the arms, and an inner wire is connected to the other arm, and the arch top portion of the brake spring has an arch shape on a spring holder that is fitted around the shaft center of the brake mounting shaft so as to be relatively rotatable. In a side-pull type caliper brake device in which the brake spring is held at both arch ends and each of the arch ends of the brake spring is engaged with a first arm and a second arm to urge each arm in a direction away from each other, an adjuster is held on a brake mounting shaft. The adjuster holder has a plate-like mounting part whose plate thickness is reduced in the axial direction of the brake mounting shaft, and the plate-like mounting part is mounted on the brake mounting shaft. It has a flat plate-like rising part that is fitted over the mounting axis, extends to one side intersecting the mounting axis, and rises upward.
Moreover, it has a flat plate-shaped support part for attaching an adjuster extending from the upper side of the flat plate-shaped rising part in the axial direction of the brake mounting shaft, and has an L-shaped part in side view, and further has a screw hole. an adjusting tool for adjusting the elastic force of the brake spring, and a screw shaft screwed into the screw hole of the adjusting tool, and the adjusting tool is supported by the flat plate-like supporting part of the holding body and rotates around the vertical axis. A side-pull type caliper brake device, characterized in that it is equipped with an adjuster that is movable but cannot be moved in the vertical direction with respect to a supporting part, and fine adjustment means by screw feeding, which is made up of the following.