Expansion brake easy to pull

Abstract

The utility model discloses an expansion brake easy to pull, which comprises a shell, a pair of brake blocks are arranged in the shell, a driving round hole and a rotating pivot are arranged on the side wall of the shell, a rotatable driving head is arranged in the driving round hole, the driving head is matched with the brake blocks, each brake block comprises a C-shaped brake block body, one end of each brake block body is provided with a driving plane, and the other end of each brake block body is provided with a rotating pivot. An arc-shaped rotating arc groove is formed in the other end of the brake block body, and an arc-shaped supporting protrusion is arranged in the rotating arc groove. The driving head comprises a pair of tubular rotatable driving rollers, and the driving rollers are matched with the driving plane. In the rotating process of the driving head, the rotatable driving rollers are directly matched with the corresponding driving planes to enable the brake blocks to expand outwards, and due to the fact that relative rolling friction is generated between the driving rollers and the driving planes, the friction force is small, on one hand, the force needed by a user for pulling a brake cable is greatly reduced, and on the other hand, the brake blocks are not damaged. And the abrasion between the driving head and the driving plane is effectively reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to an expansion gate, more specifically, to an expansion gate which is easy to pull. Background Art

[0002] The expansion brake is a common brake that mainly uses a pair of "C"-shaped brake blocks to achieve braking. When the user pulls the brake line, the brake line drives the drive head to rotate. Fig.13 As shown, the existing driving head 4S is provided with a flat driving block 400. When the driving head 4S rotates, the driving block 400 directly presses the brake block, and the friction and wear between the driving block 400 and the brake block are relatively large. In addition, the braking force required by the user is also relatively large. Utility Model Content

[0003] Based on this, it is necessary to provide an easy-to-pull expansion gate to address the above technical problems.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] An easy-to-pull expansion brake, characterized in that the easy-to-pull expansion brake comprises a shell, a pair of brake blocks arranged opposite to each other are arranged in the shell, a driving circular hole and a rotating pivot are arranged on the side wall of the shell, a rotatable driving head is arranged in the driving circular hole, and the driving head cooperates with the brake blocks.

[0006] The brake block comprises a "C"-shaped brake block body, one end of which is provided with a driving plane, the other end of which is provided with an arc-shaped rotating arc groove, an arc-shaped supporting protrusion is provided in the rotating arc groove, and the supporting protrusion cooperates with the rotating pivot.

[0007] As a preferred embodiment of the present invention, the support protrusion is arranged away from the center line of the rotating arc groove and close to the driving plane.

[0008] As a preferred embodiment of the utility model, the drive head includes a drive body, the drive body includes a cylindrical drive column, the head of the drive column is provided with a disc-shaped lining plate, the lining plate is provided with an "I"-shaped mounting bracket, both ends of the mounting bracket are provided with a pin hole, a pin rod is provided in the pin hole, a tubular rotatable drive roller is provided on the pin rod, and the drive roller cooperates with the drive plane.

[0009] As a preferred embodiment of the present utility model, the driving body is an integrated structure.

[0010] As a preferred embodiment of the utility model, the driving roller is a metal part.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The utility model provides an easy-to-pull expansion brake. During the rotation of the drive head, the brake block is expanded outward by directly utilizing the cooperation between the rotatable drive roller and the corresponding drive plane. Since the drive roller and the drive plane have relative rolling friction, the friction force is small. On the one hand, the force required for the user to pull the brake line is greatly reduced. On the other hand, the wear of the drive head and the drive plane is effectively reduced, and the service life is extended. In addition, the support protrusion can effectively reduce the brake stroke and improve the comfort of the expansion brake. The easy-to-pull expansion brake has a compact structure, easy operation, long service life, and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the easy-to-pull expansion gate of the utility model;

[0015] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the easy-to-pull expansion brake;

[0016] Figure 3 for Figure 2 A schematic diagram of the three-dimensional structure of the gate block of the expansion gate;

[0017] Figure 4 for Figure 3 A detailed enlarged schematic diagram of area A in FIG.

[0018] Figure 5 for Figure 3 The three-dimensional structure diagram of the brake block in FIG. 1 is another perspective;

[0019] Figure 6 for Figure 5 A detailed enlarged schematic diagram of the B area;

[0020] Figure 7 for Figure 2 A schematic diagram of the three-dimensional structure of the driving head of the expansion brake;

[0021] Figure 8 for Figure 7 A schematic diagram of the three-dimensional structure of the drive head;

[0022] Fig. 9 This is a working schematic diagram of the expansion gate of the utility model, at this time, the gate block is not expanded;

[0023] Fig.10 for Fig. 9 A detailed enlarged schematic diagram of the C region in FIG.

[0024] Fig.11 This is a working schematic diagram of the expansion gate of the utility model. At this time, the gate block is expanded;

[0025] Fig.12 for Fig.11 A detailed enlarged schematic diagram of the D region in FIG.

[0026] Fig.13 It is a schematic diagram of the three-dimensional structure of the driving head of the existing expansion brake;

[0027] The markings in the figure are as follows: 1. expansion brake; 2. shell; 21. driving circular hole; 22. rotating pivot; 3. brake block; 31. brake block body; 32. driving plane; 33. rotating arc groove; 34. supporting protrusion; 4. driving head; 41. driving body; 411. driving column; 412. lining plate; 413. mounting bracket; 414. pin hole; 415. pin rod; 42. driving roller; X, center line. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solution in the embodiment of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present utility model.

[0029] like Figure 1 and Figure 2 As shown, the easy-to-pull expansion gate 1 includes a shell 2, in which a pair of oppositely arranged gate blocks 3 are arranged, a driving circular hole 21 and a rotating pivot 22 are arranged on the side wall of the shell 2, a rotatable driving head 4 is arranged in the driving circular hole 21, and the driving head 4 cooperates with the gate block 3.

[0030] like Figure 3 and Figure 4 As shown, the brake block 3 includes a "C"-shaped brake block body 31, one end of the brake block body 31 is provided with a driving plane 32, the other end of the brake block body 31 is provided with an arc-shaped rotating arc groove 33, and an arc-shaped supporting protrusion 34 is provided in the rotating arc groove 33, and the supporting protrusion 34 cooperates with the rotating pivot 22.

[0031] like Figure 5 and Figure 6 As shown, the support protrusion 34 is disposed away from the center line X of the rotating arc slot 33 and close to the driving plane 32 .

[0032] like Figure 7 and Figure 8 As shown, the drive head 4 includes a drive body 41, and the drive body 41 includes a cylindrical drive column 411. The head of the drive column 411 is provided with a disc-shaped liner 412, and the liner 412 is provided with an "I"-shaped mounting bracket 413. Both ends of the mounting bracket 413 are provided with a pin hole 414, and a pin rod 415 is provided in the pin hole 414. A tubular rotatable drive roller 42 is provided on the pin rod 415, and the drive roller 42 cooperates with the drive plane 32.

[0033] It should be noted that the driving body 41 is an integrated structure. In addition, the driving roller 42 is a metal part.

[0034] The working mode of the easy-to-pull expansion brake 1 is described below.

[0035] like Fig. 9 and Fig.10 As shown, in a normal state, the driving roller 42 of the driving head 4 contacts the driving planes 32 on both sides.

[0036] like Fig.11 and Fig.12 As shown, when braking is required, the user pulls the brake line, so that the drive head 4 rotates, and then the drive roller 42 presses against the corresponding drive plane 32, so that the distance between the drive planes 32 of the pair of brake blocks 3 becomes larger. In this process, the support protrusion 34 always keeps in contact with the outer wall of the rotating pivot 22. As the pair of brake blocks 3 expand outward, the braking force continues to increase, and the braking action is finally completed. At this time, the user releases the brake line, the drive head 4 and the pair of brake blocks 3 are reset, and the braking state is released.

[0037] During the rotation of the drive head 4, the brake block 3 is expanded outward by directly utilizing the cooperation between the rotatable drive roller 42 and the corresponding drive plane 32. Since the drive roller 42 and the drive plane 32 have relative rolling friction, the friction force is small. On the one hand, the force required for the user to pull the brake line is greatly reduced. On the other hand, the wear of the drive head 4 and the drive plane 32 is effectively reduced, and the service life is extended. In addition, the support protrusion 34 can effectively reduce the brake stroke and improve the comfort of the expansion brake.

[0038] The easy-to-pull expansion brake 1 has a compact structure, is easy to operate, has a long service life, and is highly practical.

[0039] Obviously, the embodiments described above are only part of the embodiments of the present application, rather than all the embodiments. The drawings provide preferred embodiments of the present application, but do not limit the patent scope of the present application.

Claims

1. An easy-to-pull expansion brake, characterized in that: The easy-to-pull expansion brake (1) comprises a shell (2), a pair of brake blocks (3) arranged opposite to each other are arranged in the shell (2), a driving circular hole (21) and a rotating pivot (22) are arranged on the side wall of the shell (2), a rotatable driving head (4) is arranged in the driving circular hole (21), and the driving head (4) cooperates with the brake blocks (3). The brake block (3) comprises a "C"-shaped brake block body (31), one end of the brake block body (31) is provided with a driving plane (32), the other end of the brake block body (31) is provided with an arc-shaped rotating arc groove (33), an arc-shaped supporting protrusion (34) is provided in the rotating arc groove (33), and the supporting protrusion (34) cooperates with the rotating pivot (22).

2. The easy-to-pull expansion brake according to claim 1, characterized in that: The support protrusion (34) is arranged to deviate from the center line (X) of the rotating arc groove (33) and to be close to the driving plane (32).

3. The easy-to-pull expansion brake according to claim 1, characterized in that: The driving head (4) comprises a driving body (41), the driving body (41) comprises a cylindrical driving column (411), the head of the driving column (411) is provided with a disc-shaped liner (412), the liner (412) is provided with an "I"-shaped mounting bracket (413), both ends of the mounting bracket (413) are provided with a pin hole (414), a pin rod (415) is provided in the pin hole (414), a tubular rotatable driving roller (42) is provided on the pin rod (415), and the driving roller (42) cooperates with the driving plane (32).

4. The easy-to-pull expansion brake according to claim 3, characterized in that: The driving body (41) is an integrated structure.

5. The easy-to-pull expansion brake according to claim 3, characterized in that: The driving roller (42) is a metal part.

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