A locking mechanism for preventing relative sliding of an inner tube and an outer tube

Abstract

The present invention provides a locking mechanism for preventing relative sliding between an inner tube and an outer tube. The inner tube is disposed within the outer tube, and a compression structure includes a compression member disposed between the outer tube and the inner tube. The compression member is configured to compress the inner tube against the inner wall of the outer tube. The compression member forms a first force-applying surface, a second force-applying surface, and a third force-applying surface toward one end of the inner tube. The first force-applying surface is configured to compress the inner tube against the left side wall and front wall of the inner wall of the outer tube, the second force-applying surface is configured to compress the inner tube against the right side wall and front wall of the inner wall of the outer tube, and the third force-applying surface is configured to compress the inner tube against the front wall of the outer tube. The left side wall of the inner tube is pressed against the left side wall of the outer tube, the right side wall of the inner tube is pressed against the right side wall of the outer tube, and the front side wall of the inner tube is pressed against the front wall of the outer tube, thereby increasing the contact area and friction between the inner and outer tubes, thereby ensuring that the inner tube is securely disposed within the outer tube.

Description

Technical Field

[0001] The invention relates to the technical field of bicycles, and relates to a locking mechanism for preventing an inner tube and an outer tube from sliding relative to each other. Background Art

[0002] A bicycle seat tube structure includes an outer tube and an inner tube. The outer tube and the inner tube are connected in a manner of an external connector or an internal compression member provided between the outer tube and the inner tube. However, in the existing connection manner of providing an internal compression member between the outer tube and the inner tube, the friction between the outer tube and the inner tube is small due to the small contact surface, resulting in a loose connection between the outer tube and the inner tube. Summary of the Invention

[0003] The present invention solves one of the problems existing in the existing related technologies to a certain extent. To this end, the purpose of the present invention is to propose a locking mechanism for preventing the inner tube and the outer tube from sliding relative to each other, thereby increasing the friction between the inner tube and the outer tube.

[0004] The above purpose is achieved through the following technical solutions:

[0005] The locking mechanism for preventing relative sliding of an inner tube and an outer tube comprises a seat tube body, the seat tube body comprising an outer tube, an inner tube and a pressing structure, the inner tube being arranged in the outer tube, the pressing structure comprising a pressing member, the pressing member being arranged between the outer tube and the inner tube, the pressing member being used to press the inner tube against the inner wall of the outer tube, the pressing member forming a first force-applying surface, a second force-applying surface and a third force-applying surface towards one end of the inner tube, the first force-applying surface being used to press the inner tube against the left side wall and the front wall of the inner wall of the outer tube, the second force-applying surface being used to press the inner tube against the right side wall and the front wall of the inner wall of the outer tube, and the third force-applying surface being used to press the inner tube against the front wall of the outer tube, so as to press the left and right side walls of the inner tube parallel to the side walls of the outer tube.

[0006] As a further improvement of the present invention, the clamping structure also includes a screw assembly, which has a fourth force-applying surface at one end of the clamping member facing the outer tube. The screw assembly passes through the outer tube and extends toward the fourth force-applying surface to press the clamping member toward the inner tube through the fourth force-applying surface.

[0007] As a further improvement of the present invention, a first pressure surface, a second pressure surface and a third pressure surface are respectively formed on the inner tube toward one end of the pressing member, the first force-applying surface cooperates with the first pressure surface to press the inner tube toward the left side wall and the front wall of the inner wall of the outer tube, the second force-applying surface cooperates with the second pressure surface to press the inner tube toward the right side wall and the front wall of the inner wall of the outer tube, and the third force-applying surface cooperates with the third pressure surface to press the inner tube toward the front wall of the inner wall of the outer tube.

[0008] As a further improvement of the present invention, it also includes a first reinforcement and a second reinforcement. A first installation space is formed at the inner tube near the first pressure surface, and the first reinforcement is arranged in the first installation space. A second installation space is formed at the inner tube near the second pressure surface, and the second reinforcement is arranged in the second installation space.

[0009] As a further improvement of the present invention, a first force-bearing surface, a first force-transmitting surface and a second force-transmitting surface are formed on the first reinforcement member. The first force-bearing surface faces the first pressure surface and cooperates with the first pressure surface to transmit the force of the first pressure surface to the first force-transmitting surface and the second force-transmitting surface through the first force-bearing surface. The first force-transmitting surface faces the left side wall of the outer tube and is used to press the inner tube toward the left side wall of the outer tube. The second force-transmitting surface faces the front side wall of the outer tube and is used to press the inner tube toward the front side wall of the outer tube.

[0010] As a further improvement of the present invention, a second force-bearing surface, a third force-transmitting surface and a fourth force-transmitting surface are formed on the second reinforcement member. The second force-bearing surface faces the second pressure surface and cooperates with the second pressure surface to transmit the force of the second pressure surface to the third force-transmitting surface and the fourth force-transmitting surface through the second force-bearing surface. The third force-transmitting surface faces the right side wall of the outer tube and is used to press the inner tube toward the right side wall of the outer tube. The two front pressing surfaces face the front side wall of the outer tube and are used to press the inner tube toward the front side wall of the outer tube.

[0011] As a further improvement of the present invention, the first force-applying surface and the second force-applying surface are inclined surfaces, the first force-applying surface is inclined from one end close to the outer tube to one end close to the inner tube toward the right side wall of the outer tube, and the second force-applying surface is inclined from one end close to the outer tube to one end close to the inner tube toward the left side wall of the outer tube.

[0012] As a further improvement of the present invention, the first force transmission surface is arranged in a vertical direction from one end close to the rear wall of the outer tube to one end close to the front wall of the outer tube, and the second force transmission surface is arranged inclined toward the left side wall of the outer tube from one end close to the rear wall of the outer tube to one end close to the front wall of the outer tube.

[0013] As a further improvement of the present invention, the third force transmission surface is arranged in a vertical direction from one end close to the rear wall of the outer tube to one end close to the front wall of the outer tube, and the fourth force transmission surface is arranged inclined toward the right side wall of the outer tube from one end close to the rear wall of the outer tube to one end close to the front wall of the outer tube.

[0014] As a further improvement of the present invention, the front wall of the outer tube is arc-shaped, and the front wall of the inner tube is also arc-shaped.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] 1. The present invention proposes a locking mechanism for preventing relative sliding of an inner tube and an outer tube. The left side wall of the inner tube is pressed against the left side wall of the outer tube, the right side wall of the inner tube is pressed against the right side wall of the outer tube, and the front side wall of the inner tube is pressed against the front wall of the outer tube, thereby increasing the contact area between the inner tube and the outer tube and increasing the friction between the inner tube and the outer tube, so that the inner tube is firmly installed in the outer tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a locking mechanism for preventing relative sliding between an inner tube and an outer tube in an embodiment;

[0018] Figure 2 is another structural schematic diagram of a locking mechanism for preventing relative sliding between an inner tube and an outer tube in an embodiment;

[0019] Figure 3 Schematic diagram of another structure of a locking mechanism for preventing relative sliding between an inner tube and an outer tube in an embodiment;

[0020] Figure 4 Schematic diagram of the structure of the outer tube and the pressing structure in the embodiment;

[0021] Figure 5 This is a schematic structural diagram of the inner tube in the embodiment;

[0022] Figure 6 is a schematic structural diagram of the first reinforcement member in the embodiment;

[0023] Figure 7 is a schematic structural diagram of the second reinforcement member in the embodiment;

[0024] Figure 8 is a cross-sectional view of a locking mechanism for preventing relative sliding between an inner tube and an outer tube in an embodiment;

[0025] Figure 9 Schematic diagram of the force direction of the pressing member in the embodiment;

[0026] Figure 10is the moving direction of the first reinforcement member and the fifth reinforcement member in the embodiment;

[0027] Figure 11 This is a diagram of a vertical sliding test after the inner tube and outer tube of the existing locking mechanism in the embodiment are locked;

[0028] Figure 12 This is a diagram of a vertical sliding test after the inner tube and outer tube of the structure of the present invention are locked in an embodiment. DETAILED DESCRIPTION

[0029] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0030] like Figure 1-12 A locking mechanism for preventing relative sliding of an inner tube and an outer tube comprises a seat tube body 100, wherein the seat tube body 100 comprises an outer tube 1, an inner tube 2 and a pressing structure 3, wherein the inner tube 2 is arranged in the outer tube 1, and the pressing structure 3 comprises a pressing member 31, wherein the pressing member 31 is arranged between the outer tube 1 and the inner tube 2, and the pressing member 31 is used to press the inner tube 2 against the inner wall of the outer tube 1, and the pressing member 31 forms a locking mechanism toward one end of the inner tube 2. A first force-applying surface 311, a second force-applying surface 312 and a third force-applying surface 313, wherein the first force-applying surface 311 is used to press the inner tube 2 toward the left side wall and the front wall of the inner wall of the outer tube 1, the second force-applying surface 312 is used to press the inner tube 2 toward the right side wall and the front wall of the inner wall of the outer tube 1, and the third force-applying surface 313 is used to press the inner tube 2 toward the front wall of the outer tube 1, so as to press the left and right side walls of the inner tube parallel to the side wall of the outer tube.

[0031] The present invention proposes a locking mechanism for preventing the inner tube and the outer tube from sliding relative to each other. The pressing member 31 is arranged between the outer tube 1 and the inner tube 2. When an external force is applied to the pressing member 31, the pressing member exerts a force on the inner tube when the pressing member is squeezed. Figure 9The external force in the direction of the inner tube 2 is applied, via the first force-applying surface 311, to compress the inner tube 2 and drive it toward the left side wall and front wall of the inner wall of the outer tube 1, thereby pressing it. The second force-applying surface 312 compresses the second pressure surface 22 of the inner tube 2 and drives it toward the right side wall and front wall of the inner wall of the outer tube 1, thereby pressing it. This ensures that the front side wall of the inner tube 2, the left side wall of the inner tube 2, and the right side wall of the inner tube 2 are tightly pressed against the front wall of the outer tube 1, thereby increasing the contact area and friction between the inner tube 2 and the outer tube 1, thereby ensuring that the inner tube 2 is firmly seated within the outer tube 1. The effective contact area between the outer surface of the inner tube and the inner surface of the outer tube is significantly increased, reaching over 90% of the circumferential effective contact area.

[0032] In this embodiment, a disconnect gap is formed between the inner tube and the third force-applying surface, so that when the third force-applying surface of the pressing member 31 acts on the inner tube, deformation of the inner tube can be effectively avoided, causing the left side wall of the inner tube to move parallel to the left side wall of the outer tube, and the right side wall of the inner tube to move parallel to the right side wall of the outer tube. This ensures that the contact area between the left side wall of the inner tube and the left side wall of the outer tube is as large as possible, and the contact area between the right side wall of the inner tube and the right side wall of the outer tube is as large as possible. When the pressing member applies a small force to the inner tube, the inner tube can be pressed against the outer tube, increasing the friction between the inner and outer tubes.

[0033] In this embodiment, the clamping structure 3 also includes a screw assembly, which includes a screw 32 and a socket 33. The screw 32 is installed in the socket 33. A screw hole is provided on the rear wall of the outer tube 1. A fourth force-applying surface 314 is formed on the end of the clamping member 31 facing the outer tube 1. An assembly groove is provided on the fourth force-applying surface 314. When locking, the screw 32 and the socket 33 pass through the screw hole of the outer tube 1 and are pressed toward the assembly groove of the clamping member 31 to connect, so that the clamping member 31 is pressed toward the inner tube 2, and further the inner tube 2 is moved toward the front wall, left wall and right wall of the outer tube 1 for compression.

[0034] It also includes a first reinforcement 4 and a second reinforcement 5. A first installation space 200 is formed at the inner tube 2 near the first pressure surface 21, and the first reinforcement 4 is arranged in the first installation space 200; a second installation space 201 is formed at the inner tube 2 near the second pressure surface 22, and the second reinforcement 5 is arranged in the second installation space 201.

[0035] Apply external force to the pressing member 31 so that when the pressing member is squeezed, the pressing member exerts pressure on the inner tube. Figure 9The external force in the direction drives the first reinforcement 4 and the fifth reinforcement 5 to move in the direction of Figure 10 The inner tube moves in the direction of the outer tube, further driving the inner tube to be pressed toward the outer tube, so that the effective contact area between the outer surface of the inner tube and the inner surface of the outer tube is greatly increased, and the effective contact area in the circumferential direction reaches more than 90%.

[0036] In this embodiment, a gap is formed on the inner tube between the first installation space 200 and the second installation space 201 to ensure that when the compression structure 3 compresses the inner tube, the inner tube moves in the left and right directions and the front direction.

[0037] After the inner tube and outer tube of the structure of the present invention were locked, a vertical sliding test was performed. The results are shown in the following table and Figure 12 :

[0038]

[0039] Table 1

[0040] After locking the inner and outer tubes of the existing locking mechanism, a vertical sliding test was conducted. The results are shown in the following table and Figure 11 :

[0041]

[0042]

[0043] Table 2

[0044]

[0045] Table 3

[0046] Comparison shows that the inner and outer tube structure proposed in the present invention can withstand greater loads before slipping, even with lower torque. This effectively increases the contact area between the inner and outer tubes, increasing friction between the inner tube and the outer tube, and thus supporting greater loads.

[0047] In this embodiment, the first force-applying surface 311 and the second force-applying surface 312 are both inclined surfaces. The first force-applying surface 311 is inclined from one end close to the outer tube 1 to one end close to the inner tube 2 toward the right side wall of the outer tube 1, and the second force-applying surface 312 is inclined from one end close to the outer tube 1 to one end close to the inner tube 2 toward the left side wall of the outer tube 1.

[0048] The first force-applying surface 311 is tilted, which can not only move and press the inner tube 2 toward the left side wall of the outer tube 1, but also press the inner tube 2 toward the front side wall of the outer tube 1; the second force-applying surface 312 is tilted, which can not only move and press the inner tube 2 toward the right side wall of the outer tube 1, but also move and press the inner tube 2 toward the front side wall of the outer tube 1.

[0049] A third force-applying surface 313 is further formed at one end of the pressing member 31 facing the inner tube 2 . The third force-applying surface 313 is used to press the inner tube 2 toward the front wall of the outer tube 1 .

[0050] In this embodiment, the third force applying surface 313 is arranged along the horizontal direction.

[0051] The pressing member 31 is subjected to an extrusion force, and the third pressure surface 23 of the inner tube 2 is pressed tightly through the third force-applying surface 313 thereon, so that the front side wall of the inner tube 2 is pressed tightly against the front wall of the outer tube 1, thereby increasing the contact area between the inner tube 2 and the outer tube 1, and increasing the contact friction between the inner tube 2 and the outer tube 1, so as to install the inner tube 2 in the outer tube 1.

[0052] A first pressing surface 21, a second pressing surface 22 and a third pressing surface 23 are respectively formed on the inner tube 2 at one end facing the pressing piece 31. The first force-applying surface 311 cooperates with the first pressing surface 21 to press the inner tube 2 toward the left side wall and the front wall of the inner wall of the outer tube 1. The second force-applying surface 312 cooperates with the second pressing surface 22 to press the inner tube 2 toward the right side wall and the front wall of the inner wall of the outer tube 1. The third force-applying surface 313 cooperates with the third pressing surface 23 to press the inner tube 2 toward the front wall of the inner wall of the outer tube 1.

[0053] The first pressure surface 21 cooperates with the first force application surface 311 , the second pressure surface 22 cooperates with the second force application surface 312 , and the third pressure surface 23 cooperates with the third force application surface 313 , so that the pressure exerted on the pressing member 31 can be transmitted to the inner tube 2 .

[0054] In this embodiment, the first pressure surface 21 is arranged at an angle, and the inclination angle and inclination direction of the first pressure surface 21 are adapted to the first force-applying surface 311, so that the force on the first force-applying surface can be transmitted to the first pressure surface 21, so that the inner tube 2 is subjected to a tightening pressure; the second pressure surface 22 is arranged at an angle, and the inclination angle and inclination direction of the second pressure surface 22 are adapted to the second force-applying surface 312, so that the force on the second force-applying surface can be transmitted to the second pressure surface 22, so that the inner tube is subjected to a tightening pressure.

[0055] In this embodiment, the pressing member 31 is in the shape of an isosceles trapezoid. The long base of the isosceles trapezoid forms a fourth force-applying surface 314 facing one end of the outer tube, the short base of the isosceles trapezoid forms a third force-applying surface 313 facing the inner tube 2, and the two sides of the isosceles trapezoid form the first force-applying surface 311 and the second force-applying surface 312.

[0056] In this embodiment, the first installation space 200 is provided near the left side wall of the inner tube 2 , and the second installation space 201 is formed near the right side wall of the inner tube 2 .

[0057] A first force-bearing surface 41, a first force-transmitting surface 42 and a second force-transmitting surface 43 are formed on the first reinforcement member 4. The first force-bearing surface 41 faces the first pressure surface 21 and cooperates with the first pressure surface 21 to transmit the force of the first pressure surface 21 to the first force-transmitting surface 42 and the second force-transmitting surface 43 through the first force-bearing surface 41. The first force-transmitting surface 42 faces the left side wall of the outer tube 1 and is used to press the inner tube 2 toward the left side wall of the outer tube 1. The second force-transmitting surface 43 faces the front side wall of the outer tube 1 and is used to press the inner tube 2 toward the front side wall of the outer tube 1.

[0058] In this embodiment, the cross section of the first reinforcement member 4 is triangular.

[0059] A fourth pressure surface 24 and a fifth pressure surface 25 are also formed on the inner wall of the first installation space 200. The fourth pressure surface 24 cooperates with the second force transmission surface 43, and the fifth pressure surface 25 cooperates with the first force transmission surface 42. In this embodiment, the fifth pressure surface 25 is arranged vertically, and the first force transmission surface 42 cooperates with the fifth pressure surface 25 and is also arranged vertically. The force transmitted to the first reinforcement member 4 by the first force transmission surface 42 applies pressure to the fifth pressure surface 25 of the inner tube 2, thereby pressing the inner tube 2 against the left side wall of the outer tube 1.

[0060] In this embodiment, the fourth pressure surface 24 is arranged at an angle, and the fourth pressure surface 24 extends from an end close to the rear wall of the outer tube 1 to an end close to the front wall of the outer tube 1 in an inclined direction toward the left side wall of the outer tube 1. The second force transmission surface 43 is arranged in coordination with the fourth pressure surface 24, that is, the second force transmission surface 43 is arranged at an angle from an end close to the rear wall of the outer tube 1 to an end close to the front wall of the outer tube 1 in an inclined direction toward the left side wall of the outer tube 1.

[0061] A second force-bearing surface 51, a third force-transmitting surface 52 and a fourth force-transmitting surface 53 are formed on the second reinforcement member 5. The second force-bearing surface 51 faces the second pressure surface 22 and cooperates with the second pressure surface 22 to transmit the force of the second pressure surface 22 to the third force-transmitting surface 52 and the fourth force-transmitting surface 53 through the second force-bearing surface 51. The third force-transmitting surface 52 faces the right side wall of the outer tube 1 and is used to press the inner tube 2 toward the right side wall of the outer tube 1. The fourth force-transmitting surface 53 faces the front side wall of the outer tube 1 and is used to press the inner tube 2 toward the front side wall of the outer tube 1.

[0062] In this embodiment, the cross section of the second reinforcement member 5 is triangular.

[0063] The first force transmission surface 42 is arranged in a vertical direction from one end close to the rear wall of the outer tube 1 to one end close to the front wall of the outer tube 1, and the second force transmission surface 43 is arranged inclined toward the left side wall of the outer tube from one end close to the rear wall of the outer tube 1 to one end close to the front wall of the outer tube 1.

[0064] The third force transmission surface 52 is arranged in a vertical direction from one end close to the rear wall of the outer tube 1 to one end close to the front wall of the outer tube 1, and the fourth force transmission surface 53 is arranged inclined toward the right side wall of the outer tube 1 from one end close to the rear wall of the outer tube 1 to one end close to the front wall of the outer tube 1.

[0065] A sixth pressing surface 26 and a seventh pressing surface 27 are further formed on the inner wall of the second installation space 201 . The sixth pressing surface 26 is arranged in cooperation with the fourth force transmission surface 53 , and the seventh pressing surface 27 is arranged in cooperation with the third force transmission surface 52 .

[0066] In this embodiment, the seventh pressure surface 27 is disposed vertically, and the third force-transmitting surface 52 cooperates with the seventh pressure surface 27 and is also disposed vertically. The force transmitted to the second reinforcement member 5 by the second force-bearing surface 51 is applied by the third force-transmitting surface 52 to the seventh pressure surface 27 of the inner tube 2, thereby pressing the inner tube 2 against the left side wall of the outer tube 1.

[0067] In this embodiment, the sixth pressure surface 26 is arranged at an angle, and the sixth pressure surface 26 extends from an end close to the rear wall of the outer tube 1 to an end close to the front wall of the outer tube 1, and is arranged to be inclined toward the right side wall of the outer tube 1. The second force transmission surface 43 is arranged in conjunction with the fourth pressure surface 24, and the fourth force transmission surface 53 is arranged to be inclined from an end close to the rear wall of the outer tube 1 to an end close to the front wall of the outer tube 1, and is arranged to be inclined toward the right side wall of the outer tube 1.

[0068] The above preferred embodiments should be regarded as examples of the implementation methods of the present application scheme. Any technical deductions, replacements, improvements, etc. that are identical or similar to the present application scheme or made based on it should be regarded as within the scope of protection of this patent.

Claims

1. A locking mechanism for preventing relative sliding of an inner tube and an outer tube, characterized in that: The seat tube body comprises an outer tube, an inner tube and a pressing structure, the inner tube being arranged in the outer tube, the pressing structure comprising a pressing member, the pressing member being arranged between the outer tube and the inner tube, the pressing member being used to press the inner tube against the inner wall of the outer tube, the pressing member forming a first force-applying surface, a second force-applying surface and a third force-applying surface towards one end of the inner tube, the first force-applying surface being used to press the inner tube against the left side wall and the front wall of the inner wall of the outer tube, the second force-applying surface being used to press the inner tube against the right side wall and the front wall of the inner wall of the outer tube, and the third force-applying surface being used to press the inner tube against the front wall of the outer tube, so as to press the left and right side walls of the inner tube parallel to the side walls of the outer tube; The compression structure further includes a screw assembly, wherein a fourth force-applying surface is provided at one end of the compression member facing the outer tube, and the screw assembly extends through the outer tube toward the fourth force-applying surface to press the compression member toward the inner tube via the fourth force-applying surface; A first pressing surface, a second pressing surface, and a third pressing surface are respectively formed on the inner tube at one end facing the pressing member, the first force-applying surface cooperates with the first pressing surface to press the inner tube toward the left side wall and the front wall of the inner wall of the outer tube, the second force-applying surface cooperates with the second pressing surface to press the inner tube toward the right side wall and the front wall of the inner wall of the outer tube, and the third force-applying surface cooperates with the third pressing surface to press the inner tube toward the front wall of the inner wall of the outer tube; It also includes a first reinforcement and a second reinforcement. A first installation space is formed at the inner tube near the first pressure surface, and the first reinforcement is arranged in the first installation space. A second installation space is formed at the inner tube near the second pressure surface, and the second reinforcement is arranged in the second installation space.

2. A locking mechanism for preventing relative sliding of an inner tube and an outer tube according to claim 1, characterized in that: A first force-bearing surface, a first force-transmitting surface and a second force-transmitting surface are formed on the first reinforcement member. The first force-bearing surface faces the first pressure surface and cooperates with the first pressure surface to transmit the force of the first pressure surface to the first force-transmitting surface and the second force-transmitting surface through the first force-bearing surface. The first force-transmitting surface faces the left side wall of the outer tube and is used to press the inner tube toward the left side wall of the outer tube. The second force-transmitting surface faces the front side wall of the outer tube and is used to press the inner tube toward the front side wall of the outer tube.

3. The locking mechanism for preventing relative sliding of an inner tube and an outer tube according to claim 1, characterized in that: A second force-bearing surface, a third force-transmitting surface and a fourth force-transmitting surface are formed on the second reinforcement member. The second force-bearing surface faces the second pressure surface and cooperates with the second pressure surface to transmit the force of the second pressure surface to the third force-transmitting surface and the fourth force-transmitting surface through the second force-bearing surface. The third force-transmitting surface faces the right side wall of the outer tube and is used to press the inner tube toward the right side wall of the outer tube. The fourth force-transmitting surface faces the front side wall of the outer tube and is used to press the inner tube toward the front side wall of the outer tube.

4. The locking mechanism for preventing relative sliding of an inner tube and an outer tube according to claim 1, characterized in that: The first force-applying surface and the second force-applying surface are inclined surfaces. The first force-applying surface is inclined from one end close to the outer tube to one end close to the inner tube toward the right side wall of the outer tube, and the second force-applying surface is inclined from one end close to the outer tube to one end close to the inner tube toward the left side wall of the outer tube.

5. The locking mechanism for preventing relative sliding of an inner tube and an outer tube according to claim 2, characterized in that: The first force transmission surface is arranged in a vertical direction from one end close to the rear wall of the outer tube to one end close to the front wall of the outer tube, and the second force transmission surface is arranged inclined toward the left side wall of the outer tube from one end close to the rear wall of the outer tube to one end close to the front wall of the outer tube.

6. The locking mechanism for preventing relative sliding of an inner tube and an outer tube according to claim 3, characterized in that: The third force transmission surface is arranged in a vertical direction from one end close to the rear wall of the outer tube to one end close to the front wall of the outer tube, and the fourth force transmission surface is arranged inclined toward the right side wall of the outer tube from one end close to the rear wall of the outer tube to one end close to the front wall of the outer tube.

7. The locking mechanism for preventing relative sliding of an inner tube and an outer tube according to claim 1, characterized in that: The front wall of the outer tube is arc-shaped, and the front wall of the inner tube is also arc-shaped.

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