JPS638556Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a center-pull type caliper brake device, and an object of the present invention is to improve the effectiveness of the brake device and the lever touch when grasping the brake lever.

Center-pull type caliper brake devices for bicycles have brackets on both sides of the frame.
A pair of left and right brake arms each having a brake shoe at the lower end are pivotally supported by a support shaft at their midpoints. By the way, conventionally, the brake arms are in an inverted L shape, and the upper sides of the support shafts of both brake arms are crossed, and the upper ends of both brake arms are connected by an interlocking wire, and the central part of the interlocking wire is connected to the brake. It was connected to the brake lever via a wire, but as mentioned above, in the past, the distance between the part of the brake arm connected to the interlocking wire and the support shaft was large, so the brake was not connected to the brake lever when the brake system was activated. The strain on the arm is large, and as a result, the gripping force of the brake lever is considerably lost in the brake system and converted into braking force. The reality is that the lever does not give a feeling of grip, that is, a feeling of braking, and makes the lever touch feel bad.

The present invention has solved the above problem, and its feature is that a pair of left and right brake arms 4, each having a brake shoe 9 at the bottom, are pivoted on both sides of a bracket 1 provided on the frame by a support shaft 5 in the middle. supporting both brake arms 4 with interlocking wire 1
In a center-pull type caliper brake device that is linked to a brake lever via a brake lever, the brake arm 4 is placed in a substantially vertical position, and a cam surface 10 is formed on the inner surface side above the support shaft 5 of the brake arm 4. At the same time, a pair of left and right actuating bodies 12 are provided on both sides of the bracket 1 and are pivotally supported by a support shaft 13 at the center side of the bracket 1, and both the actuating bodies 12 are linked by an interlocking wire 14, and
Connector 16 that slidably inserts and holds the middle part of 4.
is connected to the brake wire 17 via
The actuating body 12 is an actuating body 12 by a brake lever.
A cam portion 18 is provided which slides on the cam surface 10 by rotation of the brake arm 4 to rotate the lower side of the brake arm 4 inwardly from the support shaft 5, and the lower side of each brake arm 4 is set around the support shaft 5 as a fulcrum. A tension coil spring 11 is connected between the upper ends of the pair of brake arms 4 so as to bias them outward in the left-right direction.

Hereinafter, one embodiment of the present invention will be explained based on the drawings. The drawings show a center-pull type caliper brake device installed on a bicycle, and 1 is attached to, for example, a front fork 2 of a bicycle frame by bolts 3, etc. The mounting bracket has a front view gate shape. Reference numeral 4 denotes a pair of left and right brake arms in a substantially vertical position, whose midway portions in the height direction are pivotally supported by support shafts 5 at lower end portions on both sides of the bracket 1. The lower part of the brake arm 4 is twisted so as to have a planar shape laterally, and is used as a brake shoe mounting part 6. The mounting part 6 has a long hole 7 vertically formed through it in the horizontal direction. A brake shoe 9 is attached to the inner side of the attachment portion 6 by a bolt 8 inserted into the elongated hole 7 so as to be vertically movable and removable. The upper side of the brake arm 4 from the support shaft 5 is curved outwardly, and the inner surface of the upper side is provided with a cam surface 10 which is curved outwardly.
is formed. The only difference in the shapes of the left and right brake arms 4 is that the way the mounting portions 6 are twisted is reversed, and the shapes before twisting are the same. Reference numeral 11 denotes a tension coil spring, which is elastically interposed between the upper ends of both brake arms 4, and biases the lower side of both brake arms 4 from the support shaft 5 outward. Reference numeral 12 denotes a pair of left and right L-shaped actuating bodies, which are interposed between each side of the bracket 1 and the upper part of each brake arm 4. The actuating body 12 has one end pivotally supported by a support shaft 13 which is caulked to the side of the bolt 3 in the center of the bracket 1.
Reference numeral 14 denotes an interlocking wire, each end of which is connected to one end on the outer side of the actuating body 12 via a connector 15, and the center portion of the interlocking wire 14 is connected to a brake wire 17 via a connector 16. ing. A Bowden wire or the like is used as the brake wire 17, and the brake wire 17 is connected to a brake lever (not shown). Working body 12
A pin is caulked to the bent part of the
A cylindrical cam portion 18 is formed to protrude forward, and when the actuating body 12 is rotated by the brake lever, the cam portion 18 engages the cam surface 10 of the brake arm 4.
by sliding the support shaft 5 of the brake arm 4 upward.
Rotate the lower part inward. The only difference in the shapes of the left and right actuating bodies 12 is that the protruding directions of the cam portions 18 are opposite to each other, and the shapes before the cam portions 18 are formed are the same. others,
19 is a bicycle tire, and 20 is a rim.

According to the embodiment configured as described above, when operating the brake device, the brake lever (not shown) is grasped, and thereby the two operating bodies 12 and 12 are connected via the brake wire 17 and the interlocking wire 14.
rotates. Due to this rotation, the actuating body 1
The cam portion 18 of No. 2 is the cam surface 10 of the brake arm 4.
The lower side of the brake arm 4 is rotated inwardly from the support shaft 5, and the brake shoes 9 of both brake arms 4 are pressed against both sides of the rim 20 with equal force to perform a braking action. In the above case, the brake arm 4 is operated by a brake lever via the actuating body 12 that performs a lever action, and the portion of the brake arm 4 that is actuated by the cam portion 18 of the actuating body 12 and the support shaft 5 are Since the distance between the brake arm 4 and the actuator 12 is small, and the actuator 12 itself is also small, the strain on the brake arm 4 and the actuator 12 is small when the brake device is activated.
The gripping force of the brake lever is converted into braking force in the brake system with almost no loss.
Therefore, the effectiveness of the brake device is good, and the driver can feel a sure grip of the brake lever in his/her hand, that is, a feeling of braking, and the touch of the lever is also good. In addition, when the brake device is activated, the actuating body 12
Since the cam portion 18 of the brake arm 4 moves away from the support shaft 5 of the brake arm 4, even after the brake shoe 9 contacts the rim 20 and the brake system starts to work,
A very large force is not required to grip the brake lever, and therefore, the brake device can be suitably operated by lightly gripping the brake lever. In addition, since the left and right sides of the brake arm 4 and the actuating body 12 are made of the same material, the brake device can be manufactured at low cost.

As described in detail above, in the present invention, the brake arm is operated by the brake lever via the actuating body that exerts a lever action. By reducing the distance between the axes and making the actuating body itself small, it is possible to reduce the distortion of the brake arm and the actuating body when the brake device is activated, and there is almost no loss in the gripping force of the brake lever in the brake device. This can be converted into braking force, which not only improves the effectiveness of the brake system, but also allows the hand to firmly grasp the brake lever, that is, feel the braking sensation, making it easier to press the lever. It can be made into a good one. In addition, when the brake system is activated, the cam part of the operating body moves away from the support shaft of the brake arm, so even after the brake system starts working, a large force is not required to grip the brake lever. Therefore, the brake device can be suitably operated by lightly grasping the brake lever.

Further, there are a pair of left and right actuating bodies 12, and these two actuating bodies 12 are connected by an interlocking wire 14, and
Since the interlocking wire 14 is connected to the brake wire via the connector 16 which is slidably inserted and held in the middle of the interlocking wire 14, there may be some difference in the gap size between the left and right brake shoes 9 and both sides of the rim 20, for example. However, the left and right operating bodies can rotate independently of each other.
Moreover, as a means for urging the lower side of both brake arms 4 outward from the support shaft 5, a tension coil spring 11 is connected between the upper ends of the pair of brake arms 4. Since the lower side of each brake arm 4 is urged outward, the force for urging the lower side of each brake arm 4 outward can be made completely the same with a very simple configuration. Therefore, as described above, the interlocking wire 14
The brake arm 4 is slidable and the brake arm 4
Coupled with the fact that the tension coil spring 11 is connected between the upper ends, when the brake shoe 9 comes into pressure contact with the rim 20, substantially the same force acts on the pair of brake arms 4 in conjunction with each other, The interlocking wire 14 slides delicately against the connector 16, and the brake shoes 9 of both brake arms 4 come into pressure contact with both sides of the rim 20 with equal force, allowing good and smooth braking. .

In addition, since the actuating bodies 12 are a pair of left and right and can rotate independently of each other, the force that urges the lower side of each brake arm 4 outward is the same.
The adjustment of the mounting position of the brake shoe 9 with respect to the brake arm 4 does not require very high precision, and the adjustment of the mounting position of the brake shoe 9 can be easily performed. Furthermore, since only one tension coil spring 11 is required as a means for biasing the pair of brake arms 4, the number of structural members is small, and manufacturing is easy and inexpensive. The present invention has the various advantages mentioned above and is of great practical benefit.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a front view, FIG. 2 is an operating state diagram of FIG. 1, and FIG. 3 is a side view. 1...Mounting bracket, 2...Front hawk, 4...
... Brake arm, 5, 13 ... Support shaft, 9 ... Brake shoe, 10 ... Cam surface, 11 ... Tension coil spring, 12 ... Actuation body, 14 ... Interlocking wire,
17... Brake wire, 18... Cam part, 19
... Tire, 20 ... Rim.

Claims (1)

[Scope of utility model registration request] A pair of left and right brake arms 4 each having a brake shoe 9 at the bottom thereof are pivotally supported by a support shaft 5 in the middle of a bracket 1 provided on the frame, and both brake arms 4 are interlocked with a brake lever via an interlocking wire 14 or the like. In the center-pull type caliper brake device, the brake arm 4 is placed in a substantially vertical position, and a cam surface 10 is formed on the inner surface side above the support shaft 5 of the brake arm 4. A pair of left and right actuating bodies 12 pivoted by a support shaft 13 on the center side of the
The actuating bodies 12 are connected to each other by an interlocking wire 14, and connected to the brake wire 17 via a connector 16 that slidably inserts and holds the intermediate part of the interlocking wire 14. , comprising a cam portion 18 that slides on the cam surface 10 and rotates the lower side of the brake arm 4 inwardly from the support shaft 5 when the actuating body 12 is rotated by the brake lever,
A tension coil spring 11 is installed between the upper end portions of the pair of brake arms 4 so as to bias the lower side of each brake arm 4 outward in the left and right direction with the support shaft 5 as a fulcrum.
A center-pull type caliper brake device characterized by a combination of