Folding vertical rod of scooter

Abstract

The utility model provides a folding vertical rod of a scooter, which comprises an upper pipe and a lower pipe which are connected through a folding device and a locking device. The folding device comprises a limiting hook arranged on the side wall of the lower pipe, two parallel locking blocks are integrally arranged on the side wall of the lower pipe, an eccentric shaft penetrates through the locking blocks, the limiting hook is arranged between the two locking blocks, and the limiting hook is movably connected with a locking block shaft through the eccentric shaft. Shaft keys at two ends of the eccentric shaft are connected with quick release devices. A connecting claw is connected to the end, close to the lower pipe, of the upper pipe and arranged on the upper side of the locking block. When the upper pipe is connected with the lower pipe, the limiting hook abuts against the connecting claw. A locking device locks the upper tube and the lower tube in a folded state. The bicycle handlebar is easy and convenient to operate and high in connection stability, and the handlebar is prevented from shaking in the riding process. A locking device is integrated at the joint of the upper pipe and the lower pipe, so that the cost is reduced, and the integration level and the attractiveness are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of scooters, and in particular relates to a foldable upright pole for a scooter. Background Art

[0002] In a crowded urban environment, in order to solve the "last mile" travel problem, folding scooters have emerged. Folding scooters can be folded quickly, are easy to carry and store, and can meet the needs of different users, and are popular among people.

[0003] The existing folding skateboard usually folds the vertical tube through a folding joint to reduce the space occupied by the folding skateboard. In order to lock the folding joint, an eccentric locking structure is usually used. The existing eccentric locking mechanism is easily loosened due to vibration and pressure transmitted from the handlebar during riding. At the same time, after the pedal is folded, an additional locking device is required to fix the vertical tube, which increases the cost and affects the aesthetics.

[0004] Therefore, the above problems need to be solved urgently. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above shortcomings, the utility model provides a folding upright pole for a scooter, which is easy to operate and has high connection stability. It does not require an additional mechanism for locking the upper tube, thereby reducing costs and improving integration and aesthetics.

[0006] Technical solution: In order to achieve the above-mentioned purpose, the utility model provides a folding upright pole of a scooter, comprising an upper tube and a lower tube, which are connected by a folding device and a locking device. The folding device comprises a limit hook arranged on the side wall of the lower tube, and a locking block is integrally provided on the side wall of the lower tube. Two locking blocks are provided in parallel, and an eccentric shaft is passed through the locking block. The limit hook is arranged between the two locking blocks, and the limit hook is movably connected through the eccentric shaft and the locking block shaft. The shaft keys at both ends of the eccentric shaft are connected with a quick release device. A connecting claw is connected to one end of the upper tube close to the lower tube, and the connecting claw is arranged on the upper side of the locking block. When the upper tube and the lower tube are connected, the limit hook and the connecting claw abut. The locking device locks the upper tube and the lower tube in a folded state. During use, the upper tube is connected to the handlebar, and the lower tube is connected to the scooter frame. When riding is required, the upper tube and the lower tube are docked. At this time, the hook of the limit hook is on the upper side of the connecting claw. The quick release device is rotated, and the quick release device drives the eccentric shaft to rotate. The eccentric shaft drives the limit hook to move downward. The limit hook is pressed against the top surface of the connecting claw. The limit hook and the connecting claw are interlocked, and the folding device locks the upper tube and the lower tube in the same straight line. When folding is required, the quick release device is rotated to disengage and unlock the limit hook and the connecting claw. The upper tube is rotated until the upper tube and the lower tube are in the folded position. The locking device locks the upper tube and the lower tube to prevent the upper tube from moving during transportation. The utility model of the rotating quick release device locks the upper tube and the lower tube in the same straight line, which is easy to operate. The eccentric shaft drives the limit hook to be pressed against the top surface of the connecting claw. The connection stability is high, which prevents the handlebar from shaking during riding. The locking device is integrated at the connection between the upper tube and the lower tube, and there is no need to add an additional mechanism for locking the upper tube, which reduces costs and improves integration and aesthetics.

[0007] Furthermore, in the above-mentioned folding upright of the scooter, the locking block is provided with a first locking groove and a second locking groove, the first locking groove is provided on the upper side of the locking block, and the second locking groove is provided on the side of the first locking groove away from the lower tube. The quick release device includes an inner locking piece and a quick release wrench, and the quick release wrench and the inner locking piece are slidably connected. When the upper tube and the lower tube need to be connected, the quick release wrench is pulled, and the quick release wrench drives the inner locking piece to rotate together, and the quick release wrench is abutted against the upper tube, and one end of the inner locking piece is inserted into the first locking groove, which can avoid locking failure due to vibration and the like during riding. When the upper tube and the lower tube are folded, the quick release wrench drives the inner locking piece to rotate, and one end of the inner locking piece is inserted into the second locking groove, which prevents the quick release wrench from shaking during transportation.

[0008] Furthermore, in the above-mentioned folding upright of the scooter, the quick-release wrench is provided with a through groove. The inner locking piece is provided with a connecting column, the connecting column passes through the through groove, and the end of the connecting column away from the inner locking piece is connected to a pull piece, and the pull piece is connected to the inner locking piece through the connecting column. A spring is connected to the side wall of the through groove, one end of the spring is connected to the bolt in the countersunk hole in the side wall of the through groove, and the end of the spring away from the side wall of the through groove abuts against the connecting column. The spring pushes the inner locking piece to be inserted into the first locking groove or the second locking groove to prevent the inner locking piece from being disengaged from the first locking groove or the second locking groove. When the inner locking piece needs to be disengaged from the first locking groove or the second locking groove, the pull piece is moved, and the connecting column squeezes the spring to cause the inner locking piece to be disengaged from the first locking groove or the second locking groove.

[0009] Furthermore, in the above-mentioned folding upright of the scooter, a limiting groove is provided on the top surface of the quick-release wrench, and the bottom surface of the pull piece and the bottom surface of the limiting groove are slidably connected. The pull piece slides in the limiting groove to limit the moving distance of the pull piece, thereby ensuring that the inner locking piece is disengaged from the first locking groove or the second locking groove, and at the same time preventing the pull piece from rotating, causing the pull piece and the connecting column to disengage.

[0010] Furthermore, in the above-mentioned folding upright pole of the scooter, the eccentric shaft includes an eccentric rod, and the first connecting shaft and the second connecting shaft are respectively provided at both ends of the eccentric rod, and the eccentric rod is eccentrically connected between the first connecting shaft and the second connecting shaft. The first connecting shaft and the second connecting shaft are respectively clearance-matched with the locking block, and the eccentric rod is clearance-matched with the limit hook. The first connecting shaft and the eccentric rod are integrally arranged, and the second connecting shaft and the eccentric rod are detachably connected.

[0011] Furthermore, in the above-mentioned folding upright pole of the scooter, a first torsion spring is disposed outside the first connecting shaft, a first step is disposed near the first connecting shaft on one side of the limit hook, one end of the first torsion spring abuts against the first step, and one end of the first torsion spring away from the step abuts against the lower tube. The first torsion spring applies a thrust to the first step. When the upper tube and the lower tube are connected, the first torsion spring makes the limit hook vertical, so that the hook portion of the limit hook is on the upper side of the connecting claw, reducing manual operation and improving operational convenience.

[0012] Furthermore, in the above-mentioned folding upright pole of the scooter, a first positioning step is provided at one end of the first connecting shaft away from the eccentric rod, and a second positioning step is provided at one end of the second connecting shaft away from the eccentric rod. The first positioning step and the second positioning step are respectively connected to the grooves provided in the quick release device. The rotation of the quick release device drives the eccentric rod to rotate, pressing the limit hook against the top surface of the connecting claw to form an interlocking.

[0013] Furthermore, in the above-mentioned folding upright pole of the scooter, the top surface of the connecting claw is conical. An installation groove is provided at one end of the upper tube near the lower tube, and the connecting claw is detachably connected to the installation groove, and the bottom surface of the installation groove is a conical shape corresponding to the top surface of the connecting claw. The connecting claw is installed in the installation groove, and since the contact surfaces of the two are correspondingly conical, precise positioning is provided for the connecting claw, which improves the installation quality and the interlocking stability of the limit hook and the connecting claw.

[0014] Furthermore, in the above-mentioned folding upright pole of the scooter, the locking device includes a connecting ring connected to the lower end of the upper tube, the connecting ring is provided with an ear, two ears are provided in parallel, a locking claw is axially movably connected between the ears, a second torsion spring is provided on both sides of the locking claw, a second step is provided on both sides of the locking claw, one end of the second torsion spring abuts against the second step, and the end of the second torsion spring away from the second step abuts against the connecting ring. A locking hook is provided at the upper end of the lower tube. In the folded state, the second torsion spring squeezes the locking claw, and the locking claw and the locking hook form a lock to prevent the upper tube from moving during transportation and folding failure, thereby improving integration and aesthetics.

[0015] Furthermore, in the folding upright pole of the above-mentioned scooter, the locking claw is provided with a pull portion. The upper end of the lower tube is provided with an oblique opening portion, and the locking hook is connected to the oblique opening portion. When riding is required, the pull portion is pressed to squeeze the second torsion spring, and the locking claw and the locking hook are disengaged, so that the upper tube and the lower tube are docked and locked.

[0016] It can be seen from the above technical scheme that the utility model has the following beneficial effects: the utility model scooter foldable upright pole only needs to rotate the quick release device to lock the upper tube and the lower tube in the same straight line, which is easy to operate. The eccentric shaft drives the limit hook to be pressed against the top surface of the connecting claw, and the connection stability is high, which can prevent the handlebar from shaking during riding. One end of the inner locking piece is inserted into the first locking groove, which can prevent the locking failure due to vibration and other reasons during riding. One end of the inner locking piece is inserted into the second locking groove to prevent the quick release wrench from shaking during transportation. The locking device is integrated at the connection between the upper tube and the lower tube, and there is no need to add an additional mechanism for locking the upper tube, which reduces costs and improves integration and aesthetics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the scooter of the utility model in a locked state of the folding upright pole;

[0018] Figure 2 It is a front view of the folding uprights of the scooter of the utility model in the folded state;

[0019] Figure 3 is a partial perspective view of the folding device;

[0020] Figure 4 This is a partial enlarged view of the folding device without a quick-release wrench;

[0021] Figure 5 is a schematic diagram of the structure of the quick-release wrench;

[0022] Figure 6 is a schematic diagram of the eccentric shaft structure;

[0023] Figure 7 It is a schematic diagram of the structure of the limit hook and the connecting claw in a locked state;

[0024] Figure 8 is a schematic diagram of the connecting claw structure;

[0025] Fig. 9 is a bottom view of the upper tube;

[0026] Fig.10 for Figure 1 Sectional view;

[0027] Fig.11 It is a schematic diagram of the locking claw and the locking hook in the locked state structure.

[0028] In the figure: 1, upper tube, 11, mounting groove, 2, lower tube, 21, locking hook, 22, oblique mouth, 3, folding device, 31, limiting hook, 311, first step, 32, locking block, 321, first locking groove, 322, second locking groove, 33, eccentric shaft, 331, eccentric rod, 332, first connecting shaft, 3321, first positioning step, 333, second connecting shaft, 3331, second positioning Step, 334, first torsion spring, 34, quick release device, 341, inner locking piece, 3411, connecting column, 3412, pulling piece, 342, quick release wrench, 3421, through groove, 3422, spring, 3423, limiting groove, 35, connecting claw, 4, locking device, 41, connecting ring, 411, ear, 42, locking claw, 421, second step, 422, pulling part, 43, second torsion spring. DETAILED DESCRIPTION

[0029] Example 1

[0030] like Figure 1-2 A folding upright pole of a scooter shown in the figure comprises an upper tube 1 and a lower tube 2, and the upper tube 1 and the lower tube 2 are connected by a folding device 3 and a locking device 4. The folding device 3 comprises a limit hook 31 arranged on the side wall of the lower tube 2, and a locking block 32 is integrally provided on the side wall of the lower tube 2. Two locking blocks 32 are provided in parallel, and an eccentric shaft 33 is passed through the locking block 32. The limit hook 31 is arranged between the two locking blocks 32, and the limit hook 31 is movably connected to the locking block 32 through the eccentric shaft 33. The shaft keys at both ends of the eccentric shaft 33 are connected to a quick release device 34. A connecting claw 35 is connected to one end of the upper tube 1 close to the lower tube 2, and the connecting claw 35 is arranged on the upper side of the locking block 32. When the upper tube 1 and the lower tube 2 are connected, the limit hook 31 and the connecting claw 35 abut. The locking device 4 locks the upper tube 1 and the lower tube 2 in a folded state.

[0031] During use, the upper tube 1 is connected to the handlebar, and the lower tube 2 is connected to the pedal frame. When riding is required, the upper tube 1 and the lower tube 2 are docked, at which time the hook portion of the limit hook 31 is on the upper side of the connecting claw 35, and the quick release device 34 is rotated. The quick release device 34 drives the eccentric shaft 33 to rotate, and the eccentric shaft 33 drives the limit hook 31 to move downward. The limit hook 31 is pressed against the top surface of the connecting claw 35, and the limit hook 31 and the connecting claw 35 are interlocked. The folding device 3 locks the upper tube 1 and the lower tube 2 in the same straight line. When folding is required, the quick release device 34 is rotated to disengage and unlock the limit hook 31 and the connecting claw 35. The upper tube 1 is rotated until the upper tube 1 and the lower tube 2 are in the folded position, and the locking device 4 locks the upper tube 1 and the lower tube 2 to prevent the upper tube 1 from moving during transportation.

[0032] like Figure 3-4 The scooter shown has a foldable upright pole, and the locking block 32 is provided with a first locking groove 321 and a second locking groove 322. The first locking groove 321 is provided on the upper side of the locking block 32, and the second locking groove 322 is provided on the side of the first locking groove 321 away from the lower tube 2. The quick release device 34 includes an inner locking member 341 and a quick release wrench 342, and the quick release wrench 342 and the inner locking member 341 are slidably connected. When the upper tube 1 and the lower tube 2 need to be connected, the quick release wrench 342 is pulled, and the quick release wrench 342 drives the inner locking member 341 to rotate together, and the quick release wrench 342 is close to the upper tube 1, and one end of the inner locking member 341 is inserted into the first locking groove 321. When the upper tube 1 and the lower tube 2 are folded, the quick release wrench 342 drives the inner locking member 341 to rotate, and one end of the inner locking member 341 is inserted into the second locking groove 322. The quick release wrench 342 is provided with a through groove 3421. The inner locking member 341 is provided with a connecting column 3411, which passes through the through slot 3421. The end of the connecting column 3411 away from the inner locking member 341 is connected to a pull member 3412, and the pull member 3412 is connected to the inner locking member 341 through the connecting column 3411. A spring 3422 is connected to the side wall of the through slot 3421, one end of the spring 3422 is connected to a bolt in a countersunk hole in the side wall of the through slot 3421, and one end of the spring 3422 away from the side wall of the through slot 3421 abuts against the connecting column 3411. The spring 3422 pushes the inner locking member 341 to be inserted into the first locking groove 321 or the second locking groove 322. When the inner locking member 341 needs to be disengaged from the first locking groove 321 or the second locking groove 322 , the pull member 3412 is moved, and the connecting column 3411 compresses the spring 3422 to disengage the inner locking member 341 from the first locking groove 321 or the second locking groove 322 .

[0033] like Figure 5 The scooter shown has a foldable upright pole, a top surface of the quick-release wrench 342 is provided with a limiting groove 3423 , the bottom surface of the pull member 3412 is slidably connected to the bottom surface of the limiting groove 3423 , and the pull member 3412 slides in the limiting groove 3423 .

[0034] like Figure 6 The folding upright pole of the scooter shown in the figure, the eccentric shaft 33 includes an eccentric rod 331, and the first connecting shaft 332 and the second connecting shaft 333 are respectively provided at both ends of the eccentric rod 331, and the eccentric rod 331 is eccentrically connected between the first connecting shaft 332 and the second connecting shaft 333. The first connecting shaft 332 and the second connecting shaft 333 are respectively clearance-matched with the locking block 32, and the eccentric rod 331 is clearance-matched with the limiting hook 31. The first connecting shaft 332 and the eccentric rod 331 are integrally arranged, and the second connecting shaft 333 and the eccentric rod 331 are detachably connected.

[0035] like Figure 7 The folding upright pole of the scooter shown in the figure has a first torsion spring 334 disposed on the outer sleeve of the first connecting shaft 332, a first step 311 disposed on the side of the limiting hook 31 close to the first connecting shaft 332, one end of the first torsion spring 334 abuts against the first step 311, and the end of the first torsion spring 334 away from the step 311 abuts against the lower tube 2. The first torsion spring 334 applies a thrust to the first step 311. When the upper tube 1 and the lower tube 2 are docked, the first torsion spring 334 makes the limiting hook 31 vertical, so that the hook portion of the limiting hook 31 is located on the upper side of the connecting claw 35. A first positioning step 3321 is disposed on the end of the first connecting shaft 332 away from the eccentric rod 331, and a second positioning step 3331 is disposed on the end of the second connecting shaft 333 away from the eccentric rod 331. The first positioning step 3321 and the second positioning step 3331 are respectively connected to the grooves provided in the quick release device 34. The rotation of the quick release device 34 drives the eccentric rod 331 to rotate, pressing the limit hook 31 against the top surface of the connecting claw 35 to form an interlocking.

[0036] like Figure 8-9 The folding upright pole of the scooter shown in the figure has a conical top surface of the connecting claw 35. An installation groove 11 is provided at one end of the upper tube 1 near the lower tube 2, and the connecting claw 35 is detachably connected to the installation groove 11. The bottom surface of the installation groove 11 is a conical shape corresponding to the top surface of the connecting claw 35.

[0037] like Figure 10-11The folding upright pole of the scooter shown in the figure, the locking device 4 comprises a connecting ring 41 connected to the lower end of the upper tube 1, the connecting ring 41 is provided with an ear 411, two ears 411 are provided in parallel, a locking claw 42 is axially movably connected between the ears 411, a second torsion spring 43 is provided on both sides of the locking claw 42, a second step 421 is provided on both sides of the locking claw 42, one end of the second torsion spring 43 abuts against the second step 421, and the end of the second torsion spring 43 away from the second step 421 abuts against the connecting ring 41. A locking hook 21 is provided at the upper end of the lower tube 2. In the folded state, the second torsion spring 43 presses the locking claw 42, and the locking claw 42 and the locking hook 21 are locked. The locking claw 42 is provided with a pull part 422. An oblique opening part 22 is provided at the upper end of the lower tube 2, and the locking hook 21 is connected to the oblique opening part 22. When riding is required, the pull part 422 is pressed to squeeze the second torsion spring 43, and the locking claw 42 and the locking hook 21 are separated, so that the upper tube 1 and the lower tube 2 are docked and locked.

[0038] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the utility model so that people familiar with this field can understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A folding upright pole for a scooter, characterized in that: The invention comprises an upper tube (1) and a lower tube (2), wherein the upper tube (1) and the lower tube (2) are connected via a folding device (3) and a locking device (4); the folding device (3) comprises a limit hook (31) arranged on the side wall of the lower tube (2); the side wall of the lower tube (2) is integrally provided with a locking block (32); two locking blocks (32) are arranged in parallel; an eccentric shaft (33) is passed through the locking block (32); the limit hook (31) is arranged between the two locking blocks (32); the limit hook (31) is movably connected to the eccentric shaft (33) and the locking block (32) axis; and quick-release devices (34) are connected to the eccentric shaft (33) via shaft keys at both ends of the eccentric shaft (33). The upper tube (1) is connected to one end of the lower tube (2) with a connecting claw (35), and the connecting claw (35) is arranged on the upper side of the locking block (32); when the upper tube (1) and the lower tube (2) are connected, the limiting hook (31) and the connecting claw (35) abut against each other, and the quick release device (34) drives the eccentric shaft (33) to rotate, and the rotation of the eccentric shaft (33) drives the limiting hook (31) to move downward, and the limiting hook (31) is pressed against the top surface of the connecting claw (35); the locking device (4) is arranged between the upper tube (1) and the lower tube (2), and when in the folded state, the locking device (4) locks the upper tube (1) and the lower tube (2) in the folded state.

2. The folding upright pole of the scooter according to claim 1, characterized in that: The locking block (32) is provided with a first locking groove (321) and a second locking groove (322), wherein the first locking groove (321) is provided on the upper side of the locking block (32), and the second locking groove (322) is provided on a side of the first locking groove (321) away from the lower tube (2); the quick release device (34) comprises an inner locking piece (341) and a quick release wrench (342), wherein the quick release wrench (342) and the inner locking piece (341) are slidably connected; when the upper tube (1) and the lower tube (2) are connected, one end of the inner locking piece (341) is inserted into the first locking groove (321); when the upper tube (1) and the lower tube (2) are folded, one end of the inner locking piece (341) is inserted into the second locking groove (322).

3. The foldable upright pole of the scooter according to claim 2, characterized in that: The quick-release wrench (342) is provided with a through slot (3421); the inner locking piece (341) is provided with a connecting column (3411), the connecting column (3411) passes through the through slot (3421), one end of the connecting column (3411) away from the inner locking piece (341) is connected to a pull piece (3412), and the pull piece (3412) is connected to the inner locking piece (341) through the connecting column (3411); a spring (3422) is connected to the side wall of the through slot (3421), one end of the spring (3422) is connected to a bolt in the side wall of the through slot (3421), and one end of the spring (3422) away from the side wall of the through slot (3421) abuts against the connecting column (3411).

4. The foldable upright pole of the scooter according to claim 3, characterized in that: The top surface of the quick-release wrench (342) is provided with a limiting groove (3423), the bottom surface of the actuating member (3412) and the bottom surface of the limiting groove (3423) are slidably connected, and the actuating member (3412) slides in the limiting groove (3423).

5. The foldable upright pole of a scooter according to claim 1, characterized in that: The eccentric shaft (33) comprises an eccentric rod (331), a first connecting shaft (332) and a second connecting shaft (333) are respectively provided at two ends of the eccentric rod (331), and the eccentric rod (331) is eccentrically connected between the first connecting shaft (332) and the second connecting shaft (333); the first connecting shaft (332) and the second connecting shaft (333) are respectively clearance-matched with the locking block (32), and the eccentric rod (331) is clearance-matched with the limiting hook (31); the first connecting shaft (332) and the eccentric rod (331) are integrally arranged, and the second connecting shaft (333) and the eccentric rod (331) are detachably connected.

6. The foldable upright pole of the scooter according to claim 5, characterized in that: A first torsion spring (334) is provided on the outer sleeve of the first connecting shaft (332); a first step (311) is provided on a side of the limiting hook (31) close to the first connecting shaft (332); one end of the first torsion spring (334) abuts against the first step (311); and one end of the first torsion spring (334) away from the step (311) abuts against the lower tube (2); the first torsion spring (334) applies a thrust to the first step (311).

7. The foldable upright pole of a scooter according to claim 5, characterized in that: A first positioning step (3321) is provided at one end of the first connecting shaft (332) away from the eccentric rod (331), and a second positioning step (3331) is provided at one end of the second connecting shaft (333) away from the eccentric rod (331); the first positioning step (3321) and the second positioning step (3331) are respectively connected to grooves provided in the quick-release device (34).

8. The foldable upright pole of a scooter according to claim 1, characterized in that: The top surface of the connecting claw (35) is conical; a mounting groove (11) is provided at one end of the upper tube (1) close to the lower tube (2), the connecting claw (35) is detachably connected to the mounting groove (11), and the bottom surface of the mounting groove (11) is conical corresponding to the top surface of the connecting claw (35).

9. The foldable upright pole of a scooter according to claim 1, characterized in that: The locking device (4) comprises a connecting ring (41) connected to the lower end of the upper tube (1), the connecting ring (41) being provided with an ear portion (411), two ears (411) being provided in parallel, a locking claw (42) being axially movably connected between the ears (411), second torsion springs (43) being provided on both sides of the locking claw (42), second steps (421) being provided on both sides of the locking claw (42), one end of the second torsion spring (43) being in contact with the second step (421), and one end of the second torsion spring (43) being away from the second step (421) being in contact with the connecting ring (41); a locking hook (21) being provided at the upper end of the lower tube (2); in a folded state, the second torsion spring (43) presses the locking claw (42), and the locking claw (42) and the locking hook (21) are locked.

10. The foldable upright pole of a scooter according to claim 9, characterized in that: The locking claw (42) is provided with a pulling portion (422); the upper end of the lower tube (2) is provided with an oblique opening portion (22), and the locking hook (21) is connected to the oblique opening portion (22).

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