Column and folding boxing stand

Abstract

The utility model relates to the technical field of boxing sports equipment, and provides stand columns and a folding boxing stand, which comprise two first stand columns, two second stand columns, first oscillating rods and second oscillating rods, the first stand columns and the second stand columns are hinged with the first oscillating rods and the second oscillating rods, and the first stand columns and the second stand columns are hinged with the second oscillating rods. The first connecting piece is arranged on the first swing rod on the first stand, the second connecting piece is arranged on the first swing rod on the second stand, the first connecting piece and the second connecting piece are arranged in a hinged mode, and the second swing rod on the first stand is connected with the second swing rod on the second stand in a bolted mode. By means of the technical scheme, the problems that in the prior art, a boxing table is difficult to transport and inconvenient to disassemble and assemble are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of boxing sports equipment, in particular to a platform column and a foldable boxing ring. Background Art

[0002] With the improvement of national physique, various sports are becoming more and more popular. Especially in today's reality of increasing pressure in work and life, boxing is becoming more and more popular. Boxing is not only a popular sport, but also very entertaining. In the process of boxing, protection will be made to ensure the safety of boxers, including the floor of the boxing ring: the floor of the boxing ring usually uses a flame-retardant, quick-detachable jiu-jitsu roll pad. This design can absorb part of the impact and reduce the damage that may be caused when the boxer falls; boxing ring fence (rope): the boxing ring will be surrounded by ropes with good elasticity. These fences are also called ropes. Their function is to limit the range of boxers' activities during the game to prevent them from accidentally rushing out of the ring and causing falls. And because the ropes are elastic, they can buffer the impact force to a certain extent; boxing ring corner protection: there will be thickened cushions at the four corners for boxers to lean on when resting between rounds, and at the same time, it can protect the boxer's head and body from directly hitting the hard corner of the table when being hit in the corner; boxing ring body: the boxing ring body is soft-packed to prevent the boxing ring body from causing damage to the boxer or other personnel. Boxing ring But in real life, outdoor boxing is difficult to carry out due to the limitations of boxing venues. The reason is that the boxing ring is inconvenient to move and difficult to disassemble after installation. Utility Model Content

[0003] The utility model provides a platform column and a foldable boxing ring, which solves the problems of difficult transportation and inconvenient assembly and disassembly of the boxing ring in the related art.

[0004] The technical solution of the utility model is as follows:

[0005] Pillars, including

[0006] A first column and a second column, wherein the first column and the second column are both two in number,

[0007] A first swing rod and a second swing rod, the first swing rod and the second swing rod are hingedly arranged on the first column and the second column, a first connecting member is arranged on the first swing rod on the first column, and a second connecting member is arranged on the first swing rod on the second column, the first connecting member and the second connecting member are hingedly arranged, and the second swing rod on the first column is bolted to the second swing rod on the second column.

[0008] As a further technical solution, the bottom of the first column and the second column each has a receiving space, and the bottom of the receiving space has an inlet and outlet, and further includes

[0009] a lifting member, wherein the lifting member is slidably disposed in the accommodation space,

[0010] A wheel body, the wheel body being arranged at the bottom of the lifting member

[0011] an operating handle, the operating handle being hingedly arranged in the accommodation space,

[0012] A connecting rod, one end of which is hinged to the lifting member, and the other end of which is hinged to the operating handle.

[0013] A foldable boxing ring comprises a platform column, wherein the first connecting member has a first clamping portion, the second connecting member is hinged to the first connecting member, and further comprises

[0014] A clamping member is movably or rotatably arranged on the second connecting member and is located at one side of the first clamping portion. The clamping member is clamped on the first clamping portion after being moved or rotated.

[0015] As a further technical solution, the clamp has a second clamping portion, and the second clamping portion is used to clamp on the first clamping portion.

[0016] The first clamping part is a clamping block, and the second clamping part is a clamping hook, and the clamping hook is used to hook on the clamping block.

[0017] As a further technical solution, the clamping member is rotatably arranged on the second connecting member, and further comprises

[0018] An elastic member, one end of which acts on the second connecting member, and the other end of which acts on the clamping member to provide a force for the clamping member to clamp the first clamping portion, and the elastic member and the second clamping portion are respectively located on two sides of the clamping member.

[0019] As a further technical solution, it also includes

[0020] A guide tube, wherein the guide tube is arranged on the second connecting member, the inner diameter of the guide tube is larger than the outer diameter of the elastic member, and the elastic member is arranged inside the elastic member.

[0021] As a further technical solution, the clamping member has an avoidance slope, and the avoidance slope is located beside the elastic member. There are two avoidance slopes, which are located on both sides of the elastic member respectively.

[0022] The first connecting member and the second connecting member both have a clearance space, and the clamping member is located in the clearance space.

[0023] As a further technical solution, the clamp is movably arranged on the second connecting member, the second connecting member has a first guide groove and a second guide groove, the first guide groove is located on one side of the second guide groove and is arranged at an angle,

[0024] The clamping member has a first guide portion and a second guide portion, the first guide portion is slidably arranged in the first guide, the second guide portion is slidably arranged in the second guide, the clamping member has a second clamping portion, the second clamping portion is used to be clamped on the first clamping portion, the first clamping portion is a clamping slot, the second clamping portion is a clamping column, and the clamping column is used to be clamped in the clamping slot.

[0025] As a further technical solution, the clamp has a disassembly pushing portion, and the disassembly pushing portion is located between the first guide portion and the second guide portion.

[0026] As a further technical solution, the first connecting member has a semi-enclosed sleeve portion, the semi-enclosed sleeve portion has a rotation gap, and the end of the second connecting member is hinged on the semi-enclosed sleeve portion and rotates out of the rotation gap after rotation.

[0027] The working principle and beneficial effects of the utility model are:

[0028] In the utility model, a first column and a second column form a column group, and the two first swing arms are connected by a folding structure, and the second swing arm and the first swing arm are hinged on the first column or the second column, thereby realizing the connection between the first column and the second column. When transportation is needed, the two first swing arms are folded by the folding structure for easy transportation. After being transported to the designated position, the two first swing members are unfolded, and the first clamping part and the second clamping part of the folding structure are clamped. The structure is simple and easy to operate. When the folding structure is clamped, the second swing arm is adjusted to a vertical position with the first swing arm, and the first column and the second column of the two column groups are bolted by the second swing arm, and the bolting part is the bolting plane. After the bolting, a square boxing area is formed between the four column groups. Compared with the boxing ring in the prior art, the design of the two column groups is easy to transport after folding, which improves the application range of the boxing ring and facilitates the promotion of outdoor boxing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0030] Figure 1 It is a schematic diagram of the structure of the utility model;

[0031] Figure 2 It is a schematic diagram of the structure in the accommodation space of the utility model;

[0032] Figure 3 It is a cross-sectional schematic diagram of the connection structure of two first swing rods in the specific embodiment 1 of the utility model;

[0033] Figure 4 It is a structural schematic diagram of the connection structure of two first swing rods in specific embodiment 2 of the utility model;

[0034] In the figure: the first connecting member-1, the first clamping part-101, the second connecting member-2, the clamping member-3, the second clamping part-301, the elastic member-4, the guide tube-5, the avoidance slope-302, the make way space-6, the first guide groove-201, the second guide groove-202, the first guide part-303, the second guide part-304, the disassembly push part-7, the semi-enclosed sleeve part-102, the rotating notch-103, the first pillar-8, the second pillar-9, the first swing rod-10, the second swing rod-11, the accommodating space-901, the inlet and outlet-902, the lifting member-12, the wheel body-13, the operating handle-14, and the connecting rod-15. DETAILED DESCRIPTION

[0035] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0036] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", "several" includes "two" and "more than two", "side" or "both sides" does not only refer to the two sides, and "front and back, top and bottom" are all its two sides.

[0037] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0038] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0039] Example 1

[0040] Reference Figure 1~Figure 3 , which is the first embodiment of the utility model, proposes

[0041] Pillars, including

[0042] There are two first pillars 8 and two second pillars 9.

[0043] The first swing rod 10 and the second swing rod 11 are hingedly arranged on the first column 8 and the second column 9, the first connecting member 1 is arranged on the first swing rod 10 on the first column 8, the second connecting member 2 is arranged on the first swing rod 10 on the second column 9, the first connecting member 1 and the second connecting member 2 are hingedly arranged, and the second swing rod 11 on the first column 8 is bolted to the second swing rod 11 on the second column 9.

[0044] In the present embodiment, a first pillar 8 and a second pillar 9 form a pillar group, and two first swing arms 10 are connected by a folding structure, and the second swing arm 11 and the first swing arm 10 are hinged on the first pillar 8 or the second pillar 9, thereby realizing the connection between a first pillar 8 and a second pillar 9. When transportation is required, the two first swing arms 10 are folded by the folding structure for easy transportation. After being transported to the designated position, the two first swing members are unfolded, and the first clamping part 101 and the second clamping part 301 of the folding structure are clamped. The structure is simple and easy to operate. When the folding structure is clamped, the second swing arm 11 is adjusted to a vertical position with the first swing arm 10, and the first pillar 8 and the second pillar 9 of the two pillar groups are bolted together by the second swing arm 11. The bolting part is the bolting plane. After the bolting, a square boxing area is formed between the four pillar groups. Compared with the boxing ring in the prior art, the design of the two pillar groups is easy to transport after folding, which improves the application scope of the boxing ring and facilitates the promotion of outdoor boxing.

[0045] Furthermore, the bottom of the first column 8 and the second column 9 both have a receiving space 901, and the bottom of the receiving space 901 has an inlet and outlet 902, and also includes

[0046] The lifting member 12 is slidably disposed in the accommodation space 901.

[0047] The wheel body 13 is arranged at the bottom of the lifting member 12.

[0048] The operating handle 14 is hingedly disposed in the accommodation space 901.

[0049] A connecting rod 15 , one end of which is hinged to the lifting member 12 , and the other end of which is hinged to the operating handle 14 .

[0050] In this embodiment, a lifting wheel 13 is designed in the accommodation space 901 of the first column 8 and the second column 9. Compared with the boxing ring in the prior art, the lifting wheel is lowered and extends out of the accommodation space 901 from the inlet and outlet 902. The lifting wheel can slide the boxing ring after it is extended. The design of the lifting wheel solves the problem of the inconvenience of moving the boxing ring after installation in the prior art. When the wheel 13 needs to be lifted, the operating handle 14 is pulled, and the operating handle 14 drives the connecting rod 15 to swing. After the connecting rod 15 swings, it drives the lifting member 12 to lift. The lifting member 12 drives the wheel 13 to lift. The operating handle 14 is hingedly arranged in the accommodation space 901. The operating handle 14 and the connecting rod 15 form a lever, which can save effort to lift the wheel 13. The structure is simple and not easy to damage. The design of the lifting wheel 13 can ensure that the column can be firmly set on the ground when it is not moving, avoid sliding of the boxing ring during use due to the wheel 13, and ensure the stable installation of the equipment.

[0051] A foldable boxing ring includes a platform column, a first connecting member 1 having a first clamping portion 101, a second connecting member 2 being hinged to the first connecting member 1, and further comprising

[0052] The clamping member 3 is movably or rotatably disposed on the second connecting member 2 and is located at one side of the first clamping portion 101 . The clamping member 3 is clamped on the first clamping portion 101 after being moved or rotated.

[0053] The present embodiment designs a first connecting member 1 and a second connecting member 2, and the first clamping portion 101 and the clamping member 3 are driven to move by the rotation of the first connecting member 1 and the second connecting member 2 around the hinge axis, so that the clamping member 3 is clamped by the first clamping portion 101. Compared with the folding structure of the prior art, the first connecting member 1 and the second connecting member 2 are quickly connected and disassembled, and the boxing ring can be quickly folded after the bottom railing is cut, thereby realizing the quick folding and transportation of the boxing ring. Compared with the boxing ring in the prior art, the boxing ring in the prior art cannot be moved, is inconvenient to disassemble after installation, and occupies a large area. If a boxing ring is needed for an outdoor boxing match, the boxing ring needs to be installed as a whole. Once it is found that the boxing ring is offset or needs to be moved after installation, the boxing ring needs to be dismantled as a whole and reinstalled, which is time-consuming and labor-intensive, and greatly wastes manpower and material resources. The boxing ring with a folding structure can be easily moved as a whole to the competition or other boxing venues after the first assembly is completed due to the folding structure. When arriving at the venue, the boxing ring can be quickly assembled by unfolding the folded part. At the same time, compared with the boxing ring in the prior art, when the boxing ring is used, it can be quickly disassembled after being folded, which reduces the space occupied by the boxing ring when not in use and is convenient for storage.

[0054] Furthermore, the clamping member 3 has a second clamping portion 301, and the second clamping portion 301 is used to clamp on the first clamping portion 101.

[0055] The first clamping portion 101 is a clamping block, and the second clamping portion 301 is a clamping hook, which is used to hook on the clamping block.

[0056] In this embodiment, the clamping member 3 has a second clamping portion 301, and the second clamping portion 301 is used to be clamped by the first clamping portion 101. The first clamping portion 101 is structured as a clamping block, and the clamping block structure can be firmly clamped by the clamping hook of the second clamping portion 301. The design of the clamping hook and the clamping block can effectively prevent the first connecting member 1 and the second connecting member 2 from loosening due to the vibration generated during the use of the boxing ring, thereby avoiding injuries to the boxer caused by loose connection between the clamping hook and the clamping block, thereby ensuring the stability of the boxing ring and the safety of the boxer.

[0057] Furthermore, the clamping member 3 is rotatably arranged on the second connecting member 2, and further includes

[0058] The elastic member 4 has one end acting on the second connecting member 2 and the other end acting on the clamping member 3 to provide a force for the clamping member 3 to clamp the first clamping portion 101 . The elastic member 4 and the second clamping portion 301 are respectively located on two sides of the clamping member 3 .

[0059] In this embodiment, considering that the clamping member 3 is rotatably arranged on the second connecting member 2, if the clamping member 3 cannot provide force to clamp the first clamping part 101, the loose connection between the hook and the clamping block may cause injury to the boxer. Therefore, an elastic member 4 is designed to provide force for the clamping member 3 to clamp the first clamping part 101. The structure is simple and easy to maintain.

[0060] Furthermore, it also includes

[0061] The guide tube 5 is arranged on the second connecting member 2 , the inner diameter of the guide tube 5 is larger than the outer diameter of the elastic member 4 , and the elastic member 4 is arranged inside the elastic member 4 .

[0062] In the present embodiment, considering that the elastic part 4 is prone to deflection and damage if exposed to the outside, a guide tube 5 is designed, and the elastic part 4 is arranged in the guide tube 5 and extends out of the guide tube 5 to act on the clamp 3. Compared with the elastic part 4 in the prior art, the installation of the guide tube 5 can ensure the stability of the elastic force provided by the elastic part 4, and can effectively avoid the damage caused by bending and deformation of the elastic part 4, thereby improving the service life of the folding structure.

[0063] Furthermore, the clamp 3 has an avoidance slope 302, and the avoidance slope 302 is located beside the elastic member 4. There are two avoidance slopes 302, which are located on both sides of the elastic member 4 respectively.

[0064] The first connecting member 1 and the second connecting member 2 both have a clearance space 6 , and the clamping member 3 is located in the clearance space 6 .

[0065] In this embodiment, an avoidance slope 302 and a clearance space 6 are designed. The setting of the avoidance slope 302 facilitates the rotation of the clamping member 3, and its structure is simple, making it easier for the operator to cancel the fixation of the first connecting member 1 and the second connecting member 2. The design of the clearance space 6 places the first connecting member 1 and the second connecting member 2 in a groove body, avoiding the loosening of the first clamping part 101 and the second clamping part 301 due to accidental touch by personnel. Its structure is simple and ensures the stability of the boxing ring and the safety of the boxer.

[0066] Example 2

[0067] Reference Figure 4 , which is the second embodiment of the utility model, and this embodiment is different from the first embodiment in that:

[0068] Compared with the first embodiment, further, the clamping member 3 is movably arranged on the second connecting member 2, and the second connecting member 2 has a first guide groove 201 and a second guide groove 202, and the first guide groove 201 is located on one side of the second guide groove 202 and is arranged at an angle.

[0069] The clamp 3 has a first guide portion 303 and a second guide portion 304. The first guide portion 303 is slidably arranged in the first guide, and the second guide portion 304 is slidably arranged in the second guide. The clamp 3 has a second clamp portion 301, and the second clamp portion 301 is used to clamp on the first clamp portion 101. The first clamp portion 101 is a clamping slot, and the second clamp portion 301 is a clamping column, which is used to be clamped in the clamping slot.

[0070] In this embodiment, what is different from the first embodiment is that a sliding clamping column is designed, and the clamping column is used to clamp on the clamping slot. When the clamping slot clamps the clamping column, if there is no external thrust, the clamping part cannot be separated from the clamping slot. When the boxing ring vibrates, the clamping part and the clamping slot will gradually clamp under the action of friction. Compared with the first embodiment, the design of the elastic member 4 is cancelled, and its failure rate is lower, which reduces the production cost. Compared with the folding structure of the prior art, the angle setting of the first guide groove 201 and the second guide groove 202 enables the clamping member 3 to achieve curved sliding. Compared with conventional straight line sliding, the curved sliding will not slide due to slight vibration. Its structure is more stable, which reduces the failure rate of the boxing ring and ensures the safety of the boxer during boxing.

[0071] Furthermore, the clamp 3 has a disassembly pushing portion 7 , and the disassembly pushing portion 7 is located between the first guide portion 303 and the second guide portion 304 .

[0072] In the present embodiment, a disassembly push portion 7 is designed, which is arranged at an angle to the first guide groove 201 and the second guide groove 202, so as to facilitate the card column to be inserted into or removed from the card groove. It has a simple structure and is easy to operate. Compared with the card component 3 of Example 1, it is easier for the installer to disassemble. When folding the boxing ring, it is not necessary to overcome the elastic force of the elastic component 4, which reduces the force required for the installer to fold the boxing ring. In particular, when the disassembly push portion 7 is at a right angle to the second guide groove 202 during the use of the boxing ring, the force required for the card column to be separated from the card groove is minimal, which is more convenient for promotion.

[0073] Furthermore, the first connecting member 1 has a semi-enclosed sleeve 102 , and the semi-enclosed sleeve 102 has a rotation notch 103 . The end of the second connecting member 2 is hinged on the semi-enclosed sleeve 102 and rotates out of the rotation notch 103 after rotation.

[0074] In this embodiment, the first connecting member 1 is designed with a semi-enclosed sleeve 102. When the boxing ring is in use, the semi-enclosed sleeve 102 wraps the second connecting member 2, so that the possibility of the second connecting member 2 being accidentally touched and thus folding the boxing ring is reduced. At the same time, the wrapped second connecting member 2 has a more stable structure and is not easily damaged, which is conducive to extending the service life of the second connecting member 2. The rotation notch 103 makes the second connecting member 2 rotate more smoothly, avoids interference between the first connecting member 1 and the second connecting member 2, and facilitates the operator to fold the boxing ring.

[0075] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A pillar, characterized in that: include a first column (8) and a second column (9), wherein the first column (8) and the second column (9) are both two in number, A first swinging rod (10) and a second swinging rod (11), the first column (8) and the second column (9) are both hingedly provided with the first swinging rod (10) and the second swinging rod (11), a first connecting member (1) is provided on the first swinging rod (10) on the first column (8), a second connecting member (2) is provided on the first swinging rod (10) on the second column (9), the first connecting member (1) and the second connecting member (2) are hingedly provided, and the second swinging rod (11) on the first column (8) is bolted to the second swinging rod (11) on the second column (9).

2. The pillar according to claim 1, characterized in that: The bottom of each of the first pillar (8) and the second pillar (9) has a receiving space (901), the bottom of the receiving space (901) has an inlet and outlet (902), and further includes: a lifting member (12), the lifting member (12) being slidably disposed in the accommodating space (901), A wheel body (13), wherein the wheel body (13) is arranged at the bottom of the lifting member (12) an operating handle (14), the operating handle (14) being hingedly disposed in the accommodating space (901), A connecting rod (15), one end of the connecting rod (15) is hinged to the lifting member (12), and the other end of the connecting rod (15) is hinged to the operating handle (14).

3. Foldable boxing ring, characterized in that: The platform column comprises the platform column according to claim 2, wherein the first connecting member (1) has a first clamping portion (101), the second connecting member (2) is hinged to the first connecting member (1), and further comprises A clamping member (3), the clamping member (3) is movably or rotatably arranged on the second connecting member (2) and is located on one side of the first clamping portion (101); the clamping member (3) is clamped on the first clamping portion (101) after being moved or rotated.

4. The foldable boxing ring according to claim 3, characterized in that: The clamping member (3) has a second clamping portion (301), wherein the second clamping portion (301) is used to clamp onto the first clamping portion (101). The first clamping portion (101) is a clamping block, and the second clamping portion (301) is a clamping hook, and the clamping hook is used to hook onto the clamping block.

5. The foldable boxing ring according to claim 4, characterized in that: The clamping member (3) is rotatably arranged on the second connecting member (2), and further comprises An elastic member (4), one end of the elastic member (4) acts on the second connecting member (2), and the other end of the elastic member (4) acts on the clamping member (3) to provide a force for the clamping member (3) to clamp the first clamping portion (101), the elastic member (4) and the second clamping portion (301) being located on two sides of the clamping member (3), respectively.

6. The foldable boxing ring according to claim 5, characterized in that: Also includes A guide tube (5), the guide tube (5) being arranged on the second connecting member (2), the inner diameter of the guide tube (5) being larger than the outer diameter of the elastic member (4), and the elastic member (4) being arranged inside the elastic member (4).

7. The foldable boxing ring according to claim 5, characterized in that: The clamping member (3) has an avoidance slope (302), the avoidance slope (302) is located beside the elastic member (4), and there are two avoidance slopes (302), which are located on both sides of the elastic member (4). The first connecting member (1) and the second connecting member (2) both have a clearance space (6), and the clamping member (3) is located in the clearance space (6).

8. The foldable boxing ring according to claim 3, characterized in that: The clamping member (3) is movably arranged on the second connecting member (2), the second connecting member (2) having a first guide groove (201) and a second guide groove (202), the first guide groove (201) being located on one side of the second guide groove (202) and being arranged at an angle, The clamping member (3) comprises a first guide portion (303) and a second guide portion (304); the first guide portion (303) is slidably arranged in the first guide, and the second guide portion (304) is slidably arranged in the second guide; the clamping member (3) comprises a second clamping portion (301); the second clamping portion (301) is used to clamp on the first clamping portion (101); the first clamping portion (101) is a clamping slot, and the second clamping portion (301) is a clamping column; the clamping column is used to clamp in the clamping slot.

9. The foldable boxing ring according to claim 8, characterized in that: The clamp (3) has a disassembly pushing portion (7), and the disassembly pushing portion (7) is located between the first guide portion (303) and the second guide portion (304).

10. The foldable boxing ring according to claim 8, characterized in that: The first connecting member (1) has a semi-enclosed sleeve (102), the semi-enclosed sleeve (102) has a rotation notch (103), and the end of the second connecting member (2) is hinged on the semi-enclosed sleeve (102) and rotates out of the rotation notch (103) after rotation.

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