Ladder joint

Abstract

The utility model belongs to the technical field of ladders, and particularly relates to a ladder joint which comprises a first swing arm and a second swing arm which are rotatably connected, a locking device is movably arranged on the first swing arm, a plurality of positioning parts are arranged on the second swing arm, and the locking device is matched with the positioning parts to control the first swing arm and the second swing arm to be relatively fixed. The locking device comprises a control piece, a locking piece and a first elastic piece for driving the control piece to reset, the locking piece is matched with the positioning part to enable the first swing arm and the second swing arm to be relatively fixed, and the control piece can control the locking piece to be separated from the positioning part and enable the first swing arm and the second swing arm to rotate relatively; the first swing arm is provided with a hinge rod, the control piece is rotationally arranged on the first swing arm through the hinge rod, the second swing arm is provided with a limiting wall, and the limiting wall can abut against the hinge rod and enables the first swing arm and the second swing arm to be stably unfolded. The utility model aims to provide the ladder joint which is stable in structure, convenient to produce and process and long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of ladders, and in particular relates to a ladder joint. Background Art

[0002] The ladder joint is an important component of the folding ladder. The ladder joint connects two adjacent single ladders so that the adjacent single ladders can be relatively unfolded and folded.

[0003] Many folding ladders can unfold two adjacent single ladders into a straight line shape. During use, the ladder joints are subjected to large forces, which causes the ladder joints to deform and affects the stable unfolding of the folding ladder. Therefore, some folding ladders are provided with a limiting structure, such as the ladder folding joint disclosed in Chinese utility model patent CN 201820908356.9, which includes a movable joint. The two ends of the movable joint are respectively used to connect the ladder frames. The movable joint can drive the ladder frames at both ends to expand or close relative to each other. The movable joint is respectively provided with a first swing arm and a second swing arm. When the movable joint drives the ladder frames at both ends to expand, the movable joint drives the first swing arm to close toward the second swing arm. When the first swing arm and the second swing arm are closed together, the first swing arm and the second swing arm limit the ladder frames at both ends from continuing to expand; the inner end of the first swing arm is provided with a first top plate, and the inner end of the second swing arm is provided with a second top plate corresponding to the first top plate. When the first swing arm and the second swing arm are closed together, the first top plate abuts against the second top plate.

[0004] According to the specification and the drawings in the specification, the first top plate and the second top plate in the above structure are both bent. Although this structure can increase the contact surface of the first top plate and the second top plate, and avoid stress concentration on the first top plate and the second top plate, thereby preventing deformation or damage, the bending structure has low strength. During use, the first top plate and the second top plate are still easily deformed, thereby affecting the stable deployment of the first swing arm and the second swing arm, and affecting the fit between the buckle and the slot. Summary of the Invention

[0005] In order to overcome the defects in the prior art, the purpose of the present invention is to provide a ladder joint which has a stable structure, is easy to produce and process, and has a long service life.

[0006] The purpose of this utility model is achieved in this way:

[0007] A ladder joint includes a first swing arm and a second swing arm connected in rotation, a locking device movably provided on the first swing arm, and a plurality of positioning parts provided on the second swing arm, the locking device cooperates with the positioning parts to control the first swing arm and the second swing arm to be relatively fixed, the locking device includes a control member, a locking member and a first elastic member that drives the control member to reset, the locking member cooperates with the positioning part to fix the first swing arm and the second swing arm relatively, the control member can control the locking member to disengage from the positioning part and enable the first swing arm and the second swing arm to rotate relative to each other; a hinge rod is provided on the first swing arm, the control member is rotatably provided on the first swing arm through the hinge rod, and a limiting wall is provided on the second swing arm, the limiting wall can abut against the hinge rod and enable the first swing arm and the second swing arm to be stably unfolded.

[0008] The utility model is further configured as follows: a first abutting wall is provided on the first swing arm, a second abutting wall corresponding to the first abutting wall is provided on the second swing arm, and the hinged rod and the first abutting wall respectively abut against the limiting wall and the second abutting wall, so that the first swing arm and the second swing arm can be stably deployed.

[0009] The utility model is further configured as follows: the upper side of the first swing arm is bent to form a first upper side plate, the first abutting wall is arranged at the end of the first upper side plate and is perpendicular to the extension direction of the first upper side plate, the upper side of the second swing arm is bent to form a second upper side plate, the second abutting wall is arranged at the end of the second upper side plate and is perpendicular to the extension direction of the second upper side plate; when the first swing arm and the second swing arm are fully extended, the first abutting wall abuts against the second abutting wall, and the first upper side plate and the second upper side plate extend in the same direction.

[0010] The utility model is further configured as follows: a hinge groove is provided on the first swing arm, the second swing arm passes through the hinge groove and is rotatably connected to the first swing arm, the hinge rod passes through the hinge groove, and the limiting wall passes through the hinge groove and abuts against the hinge rod.

[0011] The utility model is further configured as follows: the first swing arm includes two shells bent from metal plates, the shells include a swing arm body and a hinge part, the hinge part is arranged at one end of the swing arm body and extends downwardly from the swing arm body, the hinge groove is arranged in the hinge part, and the lower side of the swing arm body is bent to form a support wall inclined downwardly from the hinge part, the support wall is connected to the hinge part and supports the hinge part.

[0012] The utility model is further configured as follows: the locking piece extends to both sides of the second swing arm, and guide grooves adapted to the locking piece are provided on both sides of the hinge groove. The control piece includes two drive plates, and the two drive plates are respectively arranged between the two side walls of the hinge groove and the second swing arm. The two drive plates respectively rest on the locking piece and drive the locking piece to move, and the hinge rods are respectively connected to the two drive plates, and the limiting wall penetrates between the two drive plates and rests on the hinge rod.

[0013] The utility model is further configured as follows: a swing groove is provided on the side of the first swing arm, a control member and a locking member are provided in the first swing arm, and the control member includes a control part extending from the swing groove, the control part is bent toward the side of the first swing arm, and the first elastic member drives the control member to reset and makes the control part rest against the side of the first swing arm.

[0014] The utility model is further configured as follows: the locking device also includes a second elastic member, the locking member is slidably arranged on the first swing arm, the second elastic member drives the locking member to reset and cooperate with the positioning part, and the first elastic member drives the control member to reset and disengage from the locking member; the control member is driven to rotate, and the control member can drive the locking member to disengage from the positioning part, so that the first swing arm and the second swing arm can rotate relative to each other.

[0015] The utility model is further configured as follows: an auxiliary block and a third elastic member are provided on the second swing arm, a limiting portion is provided on the auxiliary block, the third elastic member can drive the limiting portion to move into the positioning portion, thereby preventing the locking member from cooperating with the positioning portion, and a guide wall and a driving wall are respectively provided on both sides of the limiting portion; when the first swing arm and the second swing arm are relatively unfolded, the locking member can abut against the driving wall and drive the auxiliary block and the second swing arm to rotate relative to each other, thereby disengaging the limiting portion from the positioning portion and allowing the locking member to cooperate with the positioning portion; when the first swing arm and the second swing arm are relatively folded, the locking member can slide along the guide wall and allow the locking member to pass over the auxiliary block.

[0016] The utility model is further configured as follows: at least two positioning parts are provided on the second swing arm, limiting parts corresponding to each positioning part are provided on the auxiliary block, and guide grooves are provided on the sides of the positioning parts; the third elastic member drives the auxiliary block to reset so that the limiting part passes through the guide groove and enters the positioning part.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. In the present invention, the expansion of the first swing arm and the second swing arm is supported by the limiting wall and the hinged rod, which has a simple structure and is convenient for production and processing. In addition, the hinged rod in this structure has high strength and is not easy to be deformed and damaged, which is conducive to the stable expansion of the first swing arm and the second swing arm. It can also avoid the first swing arm and the second swing arm from shaking during use due to deformation of the hinged rod and the limiting wall, which is conducive to extending the service life of the ladder joint.

[0019] 2. The provision of the first abutting wall and the second abutting wall in the present invention can disperse the force on the hinge rod and the limiting wall, avoid deformation and damage of the hinge rod and the limiting wall, and is beneficial to improving the stability of the first swing arm and the second swing arm when they are unfolded, thereby extending the service life of the ladder joint; because when the first swing arm and the second swing arm are fully unfolded, the first upper side plate and the second upper side plate extend in the same direction, and the first abutting wall and the second abutting wall are arranged perpendicular to the extension direction of the first upper side plate, when in use, the first upper side plate and the second upper side plate are not easily bent to the side by force, thereby avoiding bending and deformation of the first abutting wall and the second abutting wall, thereby extending the service life of the ladder joint.

[0020] 3. In the present invention, since the limiting wall penetrates into the hinge groove and rests on the hinge rod, the deflection of the limiting wall and the hinge rod during use can be avoided, which affects the contact between the limiting wall and the side wall of the hinge rod, avoids stress concentration and damage to the limiting wall and the hinge rod, and is beneficial to extending the service life of the ladder joint; the supporting wall inclined toward the bottom of the hinge part can improve the structural strength of the first rocker arm, avoids excessive force on the ladder joint during use, which causes bending and damage at the connection position of the swing arm main body and the hinge part, and is beneficial to extending the service life of the ladder joint; the setting of the guide groove facilitates the stable sliding of the locking piece, and the two driving plates facilitate uniform force on the locking piece, avoids the tilt of the locking piece affecting the disengagement of the locking piece from the positioning part, and since the hinge rod is respectively connected to the two driving plates, it is beneficial to the stable installation of the hinge rod, and avoids the tilt of the hinge rod affecting the contact between the limiting wall and the side wall of the hinge rod.

[0021] 4. The control member and locking member arranged in the first swing arm of the utility model can reduce the interference of other objects on the locking device, and are convenient for users to use the control. The control part bent toward the side of the first swing arm can reduce the occurrence of accidental touching of the control member, avoid accidental separation of the locking member and the positioning member during use, and avoid accidental folding of the ladder joint; the arrangement of the second elastic member facilitates the close cooperation between the locking member and the positioning member, and because the first elastic member drives the control member to reset and disengage from the locking member, the locking member will not move relative to each other when the control member is rotated slightly, which can increase the difficulty of accidental separation of the locking member and the positioning member, and avoid accidental folding of the ladder joint.

[0022] 5. The provision of the auxiliary block and the third elastic member in the present invention facilitates the step-by-step unfolding and quick folding of the first swing arm and the second swing arm, making it convenient for users to use; since the auxiliary block is provided with limiting parts corresponding to each positioning part, the manufacturer does not need to set up multiple auxiliary blocks, the structure is simple, the assembly and production of the ladder joint is convenient, and the production cost of the ladder joint is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the utility model;

[0024] Figure 2 It is a cross-sectional view of the utility model;

[0025] Figure 3 It is a cross-sectional view of the utility model during the folding process;

[0026] Figure 4 It is an explosion diagram of the utility model;

[0027] Figure 5 This is a structural diagram of the first swing arm in the utility model;

[0028] Figure 6 It is an exploded schematic diagram of the first swing arm in the utility model;

[0029] Figure 7 It is a structural diagram of the second swing arm in the utility model;

[0030] Figure 8 It is a structural diagram of the control component in the utility model;

[0031] Figure 9 It is a structural diagram of the auxiliary block in the utility model.

[0032] Meaning of the numbers in the figure: 1-first swing arm; 11-swing arm body; 12-hinge portion; 13-support wall;

[0033] 14-hinge slot; 15-first upper side plate; 16-hinge hole; 17-guide slot; 18-housing; 19-guide seat; 151-first abutting wall; 152-swing slot; 2-second swing arm; 21-limiting wall; 22-second abutting wall; 23-positioning part; 24-guide slot; 25-second upper side plate; 3-rotating pin; 4-locking device; 41-control part; 42-first elastic part; 43-locking part; 44-second elastic part; 411-control part; 412-drive plate; 413-connecting hole; 431-guide rod; 5-hinge rod; 6-auxiliary block; 61-limiting part; 62-guide wall; 63-drive wall; 7-third elastic part. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0035] See also Figures 1 to 9As shown, a ladder joint comprises a first swing arm 1 and a second swing arm 2 rotatably connected by a rotating pin 3, a locking device 4 is movably provided on the first swing arm 1, and a plurality of positioning parts 23 are provided on the second swing arm 2. The locking device 4 cooperates with the positioning parts 23 to control the first swing arm 1 and the second swing arm 2 to be relatively fixed. The locking device 4 comprises a control member 41, a locking member 43 and a first elastic member 42 that drives the control member 41 to reset. The locking member 43 cooperates with the positioning parts 23 to fix the first swing arm 1 and the second swing arm 2 relatively. The control member 41 can control the locking member 43 to disengage from the positioning parts 23 and enable the first swing arm 1 and the second swing arm 2 to rotate relative to each other; a locking device 4 is provided on the first swing arm 1. There is a hinged rod 5, and the control part 41 is rotatably set on the first swing arm 1 through the hinged rod 5. A limiting wall 21 is set on the second swing arm 2. The limiting wall 21 can lean against the hinged rod 5 and make the first swing arm 1 and the second swing arm 2 stably unfolded. In this structure, the expansion of the first swing arm 1 and the second swing arm 2 is supported by the limiting wall 21 and the hinged rod 5. The structure is simple and convenient for production and processing. In this structure, the hinged rod 5 has high strength and is not easy to deform and damage, which is conducive to the stable expansion of the first swing arm 1 and the second swing arm 2. It can also avoid the deformation of the hinged rod 5 and the limiting wall 21, which causes the first swing arm 1 and the second swing arm 2 to shake during use, which is beneficial to extending the service life of the ladder joint.

[0036] In the present invention, a first abutting wall 151 is provided on the first swing arm 1, and a second abutting wall 22 corresponding to the first abutting wall 151 is provided on the second swing arm 2. The hinged rod 5 and the first abutting wall 151 respectively abut against the limiting wall 21 and the second abutting wall 22, so that the first swing arm 1 and the second swing arm 2 can be stably deployed. The setting of the first abutting wall 151 and the second abutting wall 22 can disperse the force on the hinged rod 5 and the limiting wall 21, avoiding deformation and damage of the hinged rod 5 and the limiting wall 21, which is beneficial to improving the stability of the first swing arm 1 and the second swing arm 2 when they are deployed, and extending the service life of the ladder joint.

[0037] Preferably, the upper side of the first swing arm 1 is bent to form a first upper side plate 15, and the first abutting wall 151 is arranged at the end of the first upper side plate 15 and is arranged perpendicular to the extension direction of the first upper side plate 15. The upper side of the second swing arm 2 is bent to form a second upper side plate 25, and the second abutting wall 22 is arranged at the end of the second upper side plate 25 and is arranged perpendicular to the extension direction of the second upper side plate 25; when the first swing arm 1 and the second swing arm 2 are fully unfolded, the first abutting wall 151 abuts against the second abutting wall 22, and the first upper side plate 15 and the second upper side plate 25 extend in the same direction. When the ladder joint is fully unfolded and used, the first upper side plate 15 and the second upper side plate 25 are not easily bent to the side by force, thereby avoiding the first abutting wall 151 and the second abutting wall 22 from bending and deformation, thereby extending the service life of the ladder joint.

[0038] The first swing arm 1 is provided with a hinge groove 14, the second swing arm 2 is inserted into the hinge groove 14 and is rotatably connected to the first swing arm 1, the hinge rod 5 is inserted into the hinge groove 14, and the limiting wall 21 is inserted into the hinge groove 14 and abuts against the hinge rod 5. Since the limiting wall 21 is inserted into the hinge groove 14 and abuts against the hinge rod 5, the limiting wall 21 and the hinge rod 5 are prevented from being deflected during use to affect the contact between the limiting wall 21 and the side wall of the hinge rod 5, and stress concentration is avoided to cause damage to the limiting wall 21 and the hinge rod 5, which is beneficial to extending the service life of the ladder joint.

[0039] In the present invention, the first swing arm 1 comprises two housings 18 formed from bent metal sheets. The housing 18 comprises a swing arm body 11 and a hinge portion 12. The hinge portion 12 is disposed at one end of the swing arm body 11 and extends downwardly from the swing arm body 11. A hinge slot 14 is disposed in the hinge portion 12. The underside of the swing arm body 11 is bent to form a support wall 13 that is inclined downwardly from the hinge portion 12. The support wall 13 is connected to and supports the hinge portion 12. The support wall 13 inclined downwardly from the hinge portion 12 improves the structural strength of the first swing arm, preventing excessive stress on the ladder joint during use that could cause bending damage at the connection between the swing arm body 11 and the hinge portion 12, thereby extending the service life of the ladder joint.

[0040] Preferably, the rotating pin 3 and the hinge rod 5 are both fasteners, and the rotating pin 3 and the hinge rod 5 are both against the sides of the two shells 18, and the two shells 18 are tightly connected to avoid the two shells 18 from becoming loose during use and forming a gap between the two shells 18. In this embodiment, the rotating pin 3 and the hinge rod 5 are both rivets.

[0041] In this embodiment, the second swing arm 2 also includes two shells 18 bent from metal plates. The upper sides of the shells 18 on the first swing arm 1 are bent to form a first upper side plate 15, and the upper sides of the shells 18 on the second swing arm 2 are bent to form a second upper side plate 25. The shells 18 on the first swing arm 1 are each provided with a hinge hole 16, and the hinge rods 5 are rotatably connected to the hinge holes 16 respectively.

[0042] The locking member 43 extends to both sides of the second swing arm 2, and guide grooves 17 adapted to the locking member 43 are provided on both sides of the hinge groove 14. The control member 41 includes two driving plates 412, which are respectively arranged between the two side walls of the hinge groove 14 and the second swing arm 2. The two driving plates 412 respectively abut on the locking member 43 and drive the locking member 43 to move, and the two driving walls 412 are provided with connecting holes 413, and the hinge rod 5 is respectively connected to the connecting holes on the two driving plates 412. The hole 413 is connected, the limiting wall 21 passes through the two driving plates 412 and rests on the hinged rod 5. The setting of the guide groove 17 facilitates the stable sliding of the locking piece 43, and the two driving plates 412 facilitate the uniform force on the locking piece 43, avoiding the tilt of the locking piece 43 affecting the separation of the locking piece 43 from the positioning portion 23. Since the hinged rod 5 is respectively connected to the two driving plates 412, it is conducive to the stable installation of the hinged rod 5, avoiding the tilt of the hinged rod 5 affecting the contact between the limiting wall 21 and the side wall of the hinged rod 5.

[0043] Preferably, a guide rod 431 is provided on the locking member 43, and a guide seat 19 adapted to the guide rod 431 is provided on the first swing arm 1. In this embodiment, the second elastic member 44 is a compression spring, and the second elastic member 44 is sleeved on the guide rod 431. The two ends of the second elastic member 44 respectively abut against the locking member 43 and the guide seat 19.

[0044] The positioning portion 23 is a groove, the width of which increases as the distance from the bottom of the groove increases. The cross-section of the locking member 43 is trapezoidal, and the width of the locking member 43 increases as the distance from the bottom of the groove increases. The elastic member drives the locking member 43 to move toward the bottom of the groove and causes the two side walls of the locking member 43 to press against the two side walls of the groove respectively.

[0045] In the present invention, a swing groove 152 is provided on the side of the first swing arm 1, and the control member 41 and the locking member 43 are provided in the first swing arm 1, and the control member 41 includes a control part 411 extending from the swing groove 152, and the control part 411 is bent toward the side of the first swing arm 1, and the first elastic member 42 drives the control member 41 to reset and makes the control part 411 rest against the side of the first swing arm 1. The control member 41 and the locking member 43 provided in the first swing arm 1 can reduce the interference of other objects on the locking device 4, and facilitate the user to use the control. The control part 411 bent toward the side of the first swing arm 1 can reduce the occurrence of accidental touching of the control member 41, avoid accidental separation of the locking member 43 from the positioning part 23 during use, and avoid accidental folding of the ladder joint.

[0046] The locking device 4 also includes a second elastic member 44, and the locking member 43 is slidably arranged on the first swing arm 1. The second elastic member 44 drives the locking member 43 to reset and cooperate with the positioning portion 23, and the first elastic member 42 drives the control member 41 to reset and disengage from the locking member 43; the control member 41 is driven to rotate, and the control member 41 can drive the locking member 43 to disengage from the positioning portion 23, so that the first swing arm 1 and the second swing arm 2 can rotate relative to each other. The arrangement of the second elastic member 44 facilitates the close cooperation between the locking member 43 and the positioning portion 23, and because the first elastic member 42 drives the control member 41 to reset and disengage from the locking member 43, the locking member 43 will not move relative to each other when the control member 41 is rotated slightly, which can increase the difficulty of accidental disengagement of the locking member 43 from the positioning portion 23, thereby avoiding accidental folding of the ladder joint.

[0047] In the present invention, an auxiliary block 6 and a third elastic member 7 are provided on the second swing arm 2, and a limiting portion 61 is provided on the auxiliary block 6. The third elastic member 7 can drive the limiting portion 61 to move into the positioning portion 23, thereby preventing the locking member 43 from cooperating with the positioning portion 23, and a guide wall 62 and a driving wall 63 are respectively provided on both sides of the limiting portion 61; when the first swing arm 1 and the second swing arm 2 are relatively unfolded, the locking member 43 can abut against the driving wall 63 and drive the auxiliary block 6 and the second swing arm 2 to rotate relative to each other, so that the limiting portion 61 is disengaged from the positioning portion 23 and the locking member 43 can cooperate with the positioning portion 23; when the first swing arm 1 and the second swing arm 2 are relatively folded, the locking member 43 can slide along the guide wall 62 and allow the locking member 43 to pass over the auxiliary block 6. The arrangement of the auxiliary block 6 and the third elastic member 7 facilitates the step-by-step unfolding and quick folding of the first swing arm 1 and the second swing arm 2, which is convenient for users to use.

[0048] Preferably, at least two positioning parts 23 are provided on the second swing arm 2, and the auxiliary block 6 is provided with a limiting part 61 corresponding to each positioning part 23, and a guide groove 24 is provided on the side of the positioning part 23; the third elastic member 7 drives the auxiliary block 6 to reset so that the limiting part 61 passes through the guide groove 24 and enters the positioning part 23. Since the auxiliary block 6 is provided with a limiting part 61 corresponding to each positioning part 23, the manufacturer does not need to set up multiple auxiliary blocks 6. The structure is simple, the assembly and production of the ladder joint are convenient, and the production cost of the ladder joint is reduced. In this embodiment, three positioning parts 23 are provided on the second swing arm 2, and three limiting parts 61 are provided on the auxiliary block 6. The auxiliary block 6 is set in the second swing arm 2, and the end of the limiting part 61 passes through the guide groove 24 and the positioning part 23.

[0049] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A ladder joint, comprising a first swing arm (1) and a second swing arm (2) connected in rotation, wherein a locking device (4) is movably provided on the first swing arm (1), and a plurality of positioning portions (23) are provided on the second swing arm (2), wherein the locking device (4) cooperates with the positioning portions (23) to control the first swing arm (1) and the second swing arm (2) to be relatively fixed, characterized in that: The locking device (4) comprises a control member (41), a locking member (43), and a first elastic member (42) for driving the control member (41) to reset. The locking member (43) cooperates with the positioning portion (23) to relatively fix the first swing arm (1) and the second swing arm (2). The control member (41) can control the locking member (43) to disengage from the positioning portion (23) and enable the first swing arm (1) and the second swing arm (2) to relatively rotate. The first swing arm (1) is provided with a hinge rod (5). The control member (41) is rotatably provided on the first swing arm (1) through the hinge rod (5). The second swing arm (2) is provided with a limiting wall (21). The limiting wall (21) can abut against the hinge rod (5) and enable the first swing arm (1) and the second swing arm (2) to stably unfold.

2. A ladder joint according to claim 1, characterized in that: The first swing arm (1) is provided with a first abutting wall (151), and the second swing arm (2) is provided with a second abutting wall (22) corresponding to the first abutting wall (151). The hinge rod (5) and the first abutting wall (151) respectively abut against the limiting wall (21) and the second abutting wall (22), thereby stably unfolding the first swing arm (1) and the second swing arm (2).

3. A ladder joint according to claim 2, characterized in that: The upper side of the first swing arm (1) is bent to form a first upper side plate (15), the first abutting wall (151) is arranged at the end of the first upper side plate (15) and is perpendicular to the extension direction of the first upper side plate (15), the upper side of the second swing arm (2) is bent to form a second upper side plate (25), the second abutting wall (22) is arranged at the end of the second upper side plate (25) and is perpendicular to the extension direction of the second upper side plate (25); when the first swing arm (1) and the second swing arm (2) are fully unfolded, the first abutting wall (151) abuts against the second abutting wall (22), and the first upper side plate (15) and the second upper side plate (25) extend in the same direction.

4. A ladder joint according to claim 1, characterized in that: The first swing arm (1) is provided with a hinge groove (14), the second swing arm (2) is inserted into the hinge groove (14) and is rotatably connected to the first swing arm (1), the hinge rod (5) is inserted into the hinge groove (14), and the limiting wall (21) is inserted into the hinge groove (14) and abuts against the hinge rod (5).

5. A ladder joint according to claim 4, characterized in that: The first swing arm (1) comprises two housings (18) formed by bending metal plates. The housing (18) comprises a swing arm body (11) and a hinge portion (12). The hinge portion (12) is arranged at one end of the swing arm body (11) and extends downwardly from the swing arm body (11). A hinge groove (14) is arranged in the hinge portion (12). The lower side of the swing arm body (11) is bent to form a support wall (13) inclined downwardly from the hinge portion (12). The support wall (13) is connected to the hinge portion (12) and supports the hinge portion (12).

6. A ladder joint according to claim 4, characterized in that: The locking member (43) extends to both sides of the second swing arm (2), and guide grooves (17) adapted to the locking member (43) are provided on both sides of the hinge groove (14). The control member (41) includes two driving plates (412), which are respectively provided between the two side walls of the hinge groove (14) and the second swing arm (2). The two driving plates (412) respectively abut against the locking member (43) and drive the locking member (43) to move, and the hinge rod (5) is respectively connected to the two driving plates (412). The limiting wall (21) penetrates between the two driving plates (412) and abuts against the hinge rod (5).

7. A ladder joint according to claim 1, characterized in that: A swing slot (152) is provided on the side of the first swing arm (1), a control member (41) and a locking member (43) are provided in the first swing arm (1), and the control member (41) includes a control portion (411) extending from the swing slot (152), the control portion (411) is bent toward the side of the first swing arm (1), and the first elastic member (42) drives the control member (41) to reset and causes the control portion (411) to abut against the side of the first swing arm (1).

8. The ladder joint according to claim 1, characterized in that: The locking device (4) further comprises a second elastic member (44), the locking member (43) being slidably arranged on the first swing arm (1), the second elastic member (44) driving the locking member (43) to reset and cooperate with the positioning portion (23), and the first elastic member (42) driving the control member (41) to reset and disengage from the locking member (43); the control member (41) is driven to rotate, and the control member (41) can drive the locking member (43) to disengage from the positioning portion (23), thereby enabling the first swing arm (1) and the second swing arm (2) to rotate relative to each other.

9. The ladder joint according to claim 1, characterized in that: The second swing arm (2) is provided with an auxiliary block (6) and a third elastic member (7), and a limiting portion (61) is provided on the auxiliary block (6). The third elastic member (7) can drive the limiting portion (61) to move into the positioning portion (23), thereby preventing the locking member (43) from cooperating with the positioning portion (23), and a guide wall (62) and a driving wall (63) are respectively provided on both sides of the limiting portion (61); when the first swing arm (1) and the second swing arm (2) are relatively unfolded, the locking member (43) can abut against the driving wall (63) and drive the auxiliary block (6) and the second swing arm (2) to rotate relative to each other, thereby disengaging the limiting portion (61) from the positioning portion (23) and enabling the locking member (43) to cooperating with the positioning portion (23); when the first swing arm (1) and the second swing arm (2) are relatively folded, the locking member (43) can slide along the guide wall (62) and enable the locking member (43) to pass over the auxiliary block (6).

10. A ladder joint according to claim 9, characterized in that: The second swing arm (2) is provided with at least two positioning portions (23), the auxiliary block (6) is provided with limiting portions (61) corresponding to the respective positioning portions (23), and a guide groove (24) is provided on the side of the positioning portion (23); the third elastic member (7) drives the auxiliary block (6) to reset so that the limiting portion (61) passes through the guide groove (24) and enters the positioning portion (23).

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