Ladder joint with stable structure

Abstract

The utility model belongs to the technical field of ladders, and particularly relates to a ladder joint with a stable structure, which comprises a first swing arm and a second swing arm which are rotatably connected, a locking device is arranged on the first swing arm, a positioning part is arranged on the second swing arm, and the locking device is matched with the positioning part 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; the first swing arm comprises two shells, a hinge groove is formed between the two shells, the second swing arm and the locking device are both arranged in the hinge groove, the shells are rotationally connected with the second swing arm through rotating pins, a hinge rod is arranged on the first swing arm, the control piece is rotationally arranged on the first swing arm through the hinge rod, and the hinge rod and the rotating pins are both fasteners. The hinge rod and the rotating pin are connected with the two shells and drive the two shells to abut against each other, and the ladder joint is stable in structure, convenient to produce and machine and high in safety.

Description

Technical Field

[0001] The utility model belongs to the technical field of ladders, and in particular relates to a ladder joint with a stable structure. 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 great force, 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 joint disclosed in Chinese utility model patent CN 202022094375.2, which includes a first joint and a second joint hinged to each other, and a limiting portion is provided on the first joint. When the limiting portion contacts the second joint, the first joint and the second joint are in an extreme open state; a plurality of slots are provided on the first joint, and a bracket is fixedly provided on the second joint, and a buckle is slidably provided on the bracket. A spring is provided between the buckle and the bracket, and the spring forces the buckle to move toward the first joint. When the first joint rotates a certain angle relative to the second joint, the buckle is tightly pressed against the adapted slot.

[0004] In the above structure, the first joint and the second joint are connected by a rotating shaft. When in use, the lever is rotated to drive the buckle to disengage from the slot, and the lever is respectively connected to the second joint on both sides of the ladder. The location where the lever is installed is shown in the figure of the specification. Figure 2 The upper side of the second joint is close to the hole of the first joint, and the two sides of the second joint are connected only by a rotating shaft. During use, the second joint is easily deformed by force, thereby increasing the gap between the first joint and the second joint, affecting the safety and stability of the ladder joint. 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 convenient to produce and process, and has high safety.

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

[0007] A ladder joint with a stable structure comprises a first swing arm and a second swing arm rotatably connected, 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 comprises 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 parts to relatively fix the first swing arm and the second swing arm, and the control member can control the locking member to disengage from the positioning parts so that the first swing arm and the second arm can rotate relative to each other;

[0008] The first swing arm includes two shells, and a hinge groove is formed between the two shells. The second swing arm and the locking device are both arranged in the hinge groove. The shell is rotatably connected to the second swing arm through a rotating pin. A hinge rod is provided on the first swing arm, and the control part is rotatably arranged on the first swing arm through the hinge rod. The hinge rod and the rotating pin are both fasteners. The hinge rod and the rotating pin are both connected to the two shells and drive the two shells to press against each other.

[0009] The present invention is further configured as follows: a first abutting wall is provided on each of the two shells, a second abutting wall corresponding to the first abutting wall is provided on the second swing arm, the two first abutting walls respectively abut against the second abutting walls, so that the first swing arm and the second swing arm can be stably deployed, and the hinge rod is provided between the first abutting wall and the rotating pin and close to the first abutting wall, so as to avoid deformation and dislocation of the two first abutting walls.

[0010] 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.

[0011] The present invention is further configured as follows: a limiting wall is provided on the second swing arm, and the limiting wall can penetrate between the two shells and abut against the hinge rod, so that the first swing arm and the second swing arm can be stably deployed.

[0012] The utility model is further configured as follows: the shell includes 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1. In the present invention, since the second swing arm and the locking device are both arranged in the hinge groove, other objects are prevented from affecting the movement of the second swing arm and the locking device during use, which is convenient for the user to use and control. In addition, the hinge rod in this structure can not only be installed with the locking device, but also connect the two shells, which is conducive to simplifying the ladder joint structure, facilitating production and processing, and improving the structural stability of the ladder joint, avoiding the formation of gaps between the two shells during use, which may cause other objects or the user's fingers to penetrate and affect the safety of the ladder joint. It can also avoid the ladder joint being subjected to force and causing the hinge groove to deform, resulting in shaking of the connection between the first swing arm and the second swing arm, and avoid the user's fingers to penetrate the hinge groove, which is conducive to improving the safety of the ladder joint.

[0020] 2. The provision of the first abutting wall and the second abutting wall in the present invention is conducive to the stable expansion of the ladder joint, avoiding the shaking of the first swing arm and the second swing arm during use, and since the first abutting wall and the second abutting wall are subjected to greater force during use, the hinge rod close to the first abutting wall is conducive to avoiding the deformation and dislocation of the first abutting wall, which is conducive to extending the service life of the ladder joint; since the first swing arm and the second swing arm are fully expanded, 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, avoiding the bending and deformation of the first abutting wall and the second abutting wall, thereby extending the service life of the ladder joint.

[0021] 3. The limiting wall and the hinged rod in the present invention can support the expansion of the first swing arm and the second swing arm. The structure is simple and convenient for production and processing. 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 deformation of the hinged rod and the limiting wall causing the first swing arm and the second swing arm to shake during use, which is conducive to extending the service life of the ladder joint. Since the limiting wall penetrates into the hinge groove and rests on the hinged rod, the deflection of the limiting wall and the hinged rod during use to affect the contact between the limiting wall and the side wall of the hinged rod is avoided, and stress concentration is avoided to cause damage to the limiting wall and the hinged rod, which is conducive to extending the service life of the ladder joint.

[0022] 4. The supporting wall inclined toward the bottom of the hinge part in the present invention is beneficial to improving the structural strength of the first rocker arm, avoiding excessive force on the ladder joint during use, which may cause bending and damage at the connection position between the swing arm 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 drive plates facilitate uniform force on the locking piece, avoiding the inclination of the locking piece affecting the separation of the locking piece from the positioning part, and since the hinge rod is respectively connected to the two drive plates, it is beneficial to the stable installation of the hinge rod, avoiding the inclination of the hinge rod affecting the contact between the limit wall and the side wall of the hinge rod.

[0023] 5. 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.

[0024] 6. 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

[0025] Figure 1 It is a structural diagram of the utility model;

[0026] Figure 2 It is a cross-sectional view of the utility model;

[0027] Figure 3 It is a cross-sectional view of the utility model during the folding process;

[0028] Figure 4 It is an explosion diagram of the utility model;

[0029] Figure 5 This is a structural diagram of the first swing arm in the utility model;

[0030] Figure 6 It is an exploded schematic diagram of the first swing arm in the utility model;

[0031] Figure 7 It is a structural diagram of the second swing arm in the utility model;

[0032] Figure 8 It is a structural diagram of the control component in the utility model;

[0033] Figure 9 It is a structural diagram of the auxiliary block in the utility model.

[0034] Meaning of the numbers in the figure: 1-first swing arm; 11-swing arm body; 12-hinge portion; 13-support wall;

[0035] 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

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0037] See also Figures 1 to 9 As shown, a ladder joint with a stable structure includes 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 includes 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. Disengage from the positioning portion 23 and allow the first swing arm 1 and the second swing arm 2 to rotate relative to each other; the first swing arm 1 includes two shells 18, a hinge groove 14 is formed between the two shells 18, the second swing arm 2 and the locking device 4 are both arranged in the hinge groove 14, the shell 18 is rotatably connected to the second swing arm 2 through a rotating pin 3, a hinge rod 5 is provided on the first swing arm 1, the control part 41 is rotatably set on the first swing arm 1 through the hinge rod 5, the hinge rod 5 and the rotating pin 3 are both fasteners, the hinge rod 5 and the rotating pin 3 are both connected to the two shells 18, and drive the two shells 18 to press against each other.

[0038] In the above structure, since the second swing arm 2 and the locking device 4 are both arranged in the hinge groove 14, other objects are prevented from affecting the movement of the second swing arm 2 and the locking device 4 during use, which is convenient for users to use and control. In this structure, the hinge rod 5 can not only be installed with the locking device 4, but also connect the two shells 18, which is beneficial to simplify the ladder joint structure and facilitate production and processing. It can also improve the structural stability of the ladder joint, avoid the appearance of gaps between the two shells 18 during use, causing other objects or the user's fingers to penetrate, affecting the safety of the ladder joint, and can also avoid the ladder joint being subjected to force and causing the hinge groove 14 to deform, causing the connection between the first swing arm 1 and the second swing arm 2 to shake, and avoid the user's fingers from penetrating the hinge groove 14, which is beneficial to improving the safety of the ladder joint. The rotating pin 3 and the hinge rod 5 described in this embodiment are both rivets or locking bolts.

[0039] The two shells 18 are both 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 two first abutting walls 151 respectively abut against the second abutting walls 22, so that the first swing arm 1 and the second swing arm 2 can be stably deployed. The hinge rod 5 is arranged between the first abutting wall 151 and the rotating pin 3 and close to the first abutting wall 151, so as to avoid the two first abutting walls 151 from being deformed and dislocated. The arrangement of the first abutting wall 151 and the second abutting wall 22 is conducive to the stable deployment of the ladder joint and avoids the first swing arm 1 and the second swing arm 2 from shaking during use. Since the first abutting wall 151 and the second abutting wall 22 are subjected to greater force during use, the hinge rod 5 close to the first abutting wall 151 is conducive to avoiding the deformation and dislocation of the first abutting wall 151, which is conducive to extending the service life of the ladder joint.

[0040] 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.

[0041] In the present invention, a limiting wall 21 is provided on the second swing arm 2, and the limiting wall 21 can be inserted between the two shells 18 and abut against the hinge rod 5, so that the first swing arm 1 and the second swing arm 2 can be stably deployed. The limiting wall 21 and the hinge rod 5 can support the deployment of the first swing arm 1 and the second swing arm 2. The structure is simple and convenient for production and processing. In this structure, the hinge rod 5 has high strength and is not easy to be deformed and damaged, which is conducive to the stable deployment of the first swing arm 1 and the second swing arm 2, and can avoid the deformation of the hinge 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 conducive to extending the service life of the ladder joint.

[0042] 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. 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.

[0043] Preferably, the first swing arm 1 in the present invention includes two shells 18 bent from metal plates, the shell 18 includes a swing arm body 11 and a hinge 12, the hinge 12 is arranged at one end of the swing arm body 11 and extends downwardly from the swing arm body 11, the hinge groove 14 is arranged in the hinge 12, and the lower side of the swing arm body 11 is bent to form a support wall 13 inclined downwardly from the hinge 12, the support wall 13 is connected to the hinge 12 and supports the hinge 12, the support wall 13 inclined downwardly from the hinge 12 is beneficial to improving the structural strength of the first rocker arm, avoiding excessive force on the ladder joint during use, resulting in bending and damage at the connection position of the swing arm body 11 and the hinge 12, and is beneficial to extending the service life of the ladder joint.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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 with a stable structure, 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, and wherein: 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) includes two housings (18), a hinge groove (14) is formed between the two housings (18), the second swing arm (2) and the locking device (4) are both arranged in the hinge groove (14), the housing (18) is rotatably connected to the second swing arm (2) via a rotating pin (3), a hinge rod (5) is provided on the first swing arm (1), a control member (41) is rotatably arranged on the first swing arm (1) via the hinge rod (5), the hinge rod (5) and the rotating pin (3) are both fasteners, the hinge rod (5) and the rotating pin (3) are both connected to the two housings (18), and drive the two housings (18) to press against each other.

2. A ladder joint with a stable structure according to claim 1, characterized in that: The two shells (18) are both 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 two first abutting walls (151) respectively abut against the second abutting wall (22), thereby allowing the first swing arm (1) and the second swing arm (2) to be stably unfolded. The hinge rod (5) is provided between the first abutting wall (151) and the rotating pin (3) and close to the first abutting wall (151), thereby preventing the two first abutting walls (151) from deforming and misaligning.

3. A ladder joint with a stable structure 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. The structurally stable ladder joint according to claim 1, characterized in that: A limiting wall (21) is provided on the second swing arm (2), and the limiting wall (21) can penetrate between the two shells (18) and abut against the hinge rod (5), thereby allowing the first swing arm (1) and the second swing arm (2) to be stably unfolded.

5. The ladder joint with a stable structure according to claim 1, characterized in that: The housing (18) comprises a swing arm body (11) and a hinge portion (12), wherein 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), and the lower side of the swing arm body (11) is bent to form a support wall (13) inclined downwardly from the hinge portion (12), and the support wall (13) is connected to the hinge portion (12) and supports the hinge portion (12).

6. A ladder joint with a stable structure according to claim 1, 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. The ladder joint with a stable structure 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 structurally stable 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 structurally stable 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 with a stable structure 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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