Folding joint

Abstract

The application discloses a folding joint, which comprises an upper joint, a lower joint, a hinge shaft, a handle body and a tightening mechanism, one end of the handle body is provided with an eccentric part; the inner side walls of the upper joint and the lower joint are respectively provided with an upper locking groove and a lower locking groove, the tightening mechanism comprises a tightening block, an adjusting screw rod and an adjusting sleeve rod, one side of the tightening block is provided with a tightening part matched with the upper locking groove and the lower locking groove, the other side is provided with a ball socket groove, one end of the adjusting screw rod is provided with a ball head part, the other end is threadedly connected with the adjusting sleeve rod, the ball head part is matched with the ball socket groove in a spherical surface, and the tightening block can be universally swung. The folding joint disclosed by the application is matched with the ball socket groove of the tightening block in a spherical surface through the ball head part of the adjusting screw rod, the universal swinging capability of the tightening block is achieved, the sufficient occlusal area and the locking strength are effectively ensured, and the locking reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of locking mechanisms for mechanical connections, and more specifically, to a folding joint. Background Technology

[0002] Existing folding devices such as folding bicycles and folding electric vehicles all use quick-release folding joints at their folding connection points to quickly fold, unfold, and even lock the connection. However, existing folding joints have simple clamping structures with a single direction of movement, making them unable to adapt to minor deformations in the locking groove. This can easily lead to problems such as loose engagement and insufficient locking force, affecting connection rigidity.

[0003] For example, Chinese Patent 201320047403.2 discloses an internal locking folding connector for a folding bicycle, which includes an upper connector, a lower connector, and a handle. The upper and lower connectors and the handle are connected by a hinge shaft. The upper and lower connectors each have grooves on their inner walls opposite the hinge shaft. The connector also includes an eccentric flat round shaft located between the hinge shaft and the handle hole, a connector with one end movably fitted onto the eccentric flat round shaft, and the other end of the connector connected to one end of a connecting rod. The other end of the connecting rod is connected to a locking slider, which can be inserted into or removed from the grooves of the upper and lower connectors. However, the locking slider cannot adaptively adjust its angle according to the actual shape of the locking groove. When the locking groove has a positional deviation due to processing errors, or wears and deforms due to long-term use, local contact and insufficient engagement area may occur between the locking block and the groove, leading to uneven distribution of locking force and even the risk of loosening. Summary of the Invention

[0004] The purpose of this invention is to provide a folding connector that ensures sufficient engagement area and locking force between the top tightening part and the locking grooves on both sides, thereby significantly improving the locking reliability and environmental adaptability of the folding connector.

[0005] The technical solution adopted by the folding joint disclosed in this invention is: A folding connector includes an upper connector, a lower connector, a hinge shaft, a handle body, and a tightening mechanism. The upper connector, handle body, and lower connector are hinged together via the hinge shaft. One hinged end of the handle body has an eccentric portion. The inner sidewalls of the upper and lower connectors are respectively provided with an upper locking groove and a lower locking groove. The tightening mechanism includes a tightening block, an adjusting screw, and an adjusting sleeve. One side of the tightening block has a tightening portion that mates with the upper and lower locking grooves, and the other side has a ball joint groove. One end of the adjusting screw has a ball head, and the other end is threaded to the adjusting sleeve. The ball head mates with the spherical surface of the ball joint groove, allowing the tightening block to swing omnidirectionally. The adjusting sleeve engages with the eccentric portion. When the handle body rotates, the eccentric portion drives the adjusting sleeve, adjusting screw, and tightening block to move, thereby locking or unlocking.

[0006] As a preferred embodiment, the clamping mechanism further includes a mounting base, which is detachably fixed to the lower connector. The mounting base is provided with a top support plate, and the top support plate is provided with a movable hole. The adjusting screw is movably inserted through the movable hole.

[0007] As a preferred embodiment, one side of the top plate and the mounting base form a receiving groove, and the other side forms a placement groove. The receiving groove is used to receive the top clamping block, and the placement groove is used to receive the adjusting sleeve rod.

[0008] As a preferred embodiment, the clamping mechanism further includes an elastic reset element, which is a compression spring, used to drive the clamping block to reset when unlocking.

[0009] As a preferred embodiment, the clamping mechanism further includes a movable rod, one end of which is connected to the clamping block, and the other end of which is provided with a head. The compression spring is sleeved on the movable rod, with one end abutting against the top support plate and the other end abutting against the head.

[0010] As a preferred embodiment, the compression spring is sleeved on the adjusting screw, with one end abutting against the top support plate and the other end abutting against the adjusting sleeve rod.

[0011] As a preferred embodiment, the adjusting sleeve is provided with a set screw hole for installing a set screw to lock the adjusting screw.

[0012] As a preferred embodiment, the adjusting sleeve includes a connecting part and a mating part. The connecting part is threadedly connected to the adjusting screw, and the mating part has an arc-shaped surface that abuts against the eccentric part.

[0013] As a preferred embodiment, the lower connector has a notch on the side away from the clamping block.

[0014] As a preferred embodiment, the lower connector is provided with an adjustment hole, and an adjustment screw is installed in the adjustment hole. Adjusting the adjustment screw can eliminate the rotational clearance between the upper connector and the lower connector at the hinge shaft.

[0015] The beneficial effects of the folding joint disclosed in this invention are: by adjusting the ball head of the screw and forming a spherical fit with the ball groove of the tightening block, the tightening block has the ability to swing in all directions and can adaptively adjust the angle. Even if the upper and lower locking grooves are worn and deformed or have processing errors due to long-term use, the sufficient biting area and locking force between the tightening part and the locking grooves on both sides can be guaranteed, which significantly improves the locking reliability and environmental adaptability of the folding joint. Furthermore, the clamping mechanism adopts a modular design, which allows for complete disassembly and installation. When a component is damaged, there is no need to disassemble the entire folding joint; maintenance can be performed by directly disassembling the clamping mechanism, which greatly reduces maintenance difficulty, improves maintenance efficiency, and reduces maintenance costs. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the folding joint of the present invention.

[0017] Figure 2 This is an exploded view of the folding joint of the present invention.

[0018] Figure 3 This is an exploded view of the tightening mechanism in the folding joint of the present invention.

[0019] Figure 4 This is a cross-sectional schematic diagram of the folding joint of the present invention in the locked state.

[0020] Figure 5 This is a cross-sectional schematic diagram of the folding joint of the present invention in the unlocked state.

[0021] Figure 6 This is an exploded schematic diagram showing the self-locking component in the folding joint of the present invention in a self-locking state.

[0022] Figure 7 This is an exploded view of the handle body in the folding connector of the present invention. Detailed Implementation

[0023] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings: Please refer to Figure 1 and Figure 2 As shown, this embodiment provides a folding connector, including an upper connector 10, a lower connector 20, a hinge shaft 30, a handle body 40, and a tightening mechanism 50.

[0024] The upper connector 10 has a first hinge ear 11 on one side, and the lower connector 20 has a second hinge ear 21 on one side. The first hinge ear 11, the second hinge ear 21, and the lower end of the handle body 40 all have hinge holes. The hinge shaft 30 passes sequentially through the hinge holes of the first hinge ear 11, the second hinge ear 21, and the handle body 40, connecting the three components. One hinged end of the handle body 40 has an eccentric portion 41, which drives the tightening mechanism, i.e., locking or unlocking is achieved through eccentric rotation.

[0025] The inner sidewalls of the upper connector 10 and the lower connector 20 are respectively provided with an upper locking groove 12 and a lower locking groove 22. Both the upper locking groove 12 and the lower locking groove 22 have wedge-shaped mating surfaces.

[0026] Please refer to Figure 3 and Figure 4 As shown, the tightening mechanism 50 includes a tightening block 51, an adjusting screw 52, ​​an adjusting sleeve rod 53, a mounting base 54, an elastic reset component, and a movable rod 56. The elastic reset component is a compression spring 55. The tightening mechanism 50 adopts a modular design. The mounting base 54 has two symmetrical fixing holes 57. Bolts are passed through the fixing holes 57 to detachably fix the mounting base 54 to the inner cavity of the lower connector 20. When any component of the tightening mechanism 50 is damaged, the entire tightening mechanism 50 can be directly disassembled for repair or replacement without disassembling the upper connector 10 and the lower connector 20, greatly improving maintenance convenience.

[0027] One side of the clamping block 51 is integrally formed with a clamping part 511. The clamping part 511 is a V-shaped block, which includes an upper inclined part and a lower inclined part. The upper inclined part and the lower inclined part are respectively adapted to the wedge-shaped mating surfaces of the upper locking groove 12 and the lower locking groove 22 to form a tight engagement and ensure the locking force.

[0028] The other side of the tightening block 51 is provided with a ball socket groove 512, which is a hemispherical groove. One end of the adjusting screw 52 is integrally formed with a ball head 521, which is hemispherical and fits tightly with the spherical surface of the ball socket groove 512. The ball head 521 can rotate flexibly in the ball socket groove 512, so that the tightening block 51 can achieve 360° omnidirectional swing and can adaptively adjust the angle. Even if the upper locking groove 12 and the lower locking groove 22 are slightly deformed due to processing errors or wear, the tightening part 511 and the locking groove can still have sufficient engagement area and locking force.

[0029] The other end of the adjusting screw 52 is provided with an external thread. The adjusting sleeve 53 includes a connecting part 531 and a mating part 532, which are integrally formed. The connecting part 531 is a sleeve with a diameter larger than that of the adjusting screw 52. The inner wall of the sleeve is provided with an internal thread, which is threaded to the external thread of the adjusting screw 52. The end of the connecting part 531 forms a shoulder, which can limit the screwing depth of the adjusting screw 52. By adjusting the amount by which the adjusting screw 52 screws into the connecting part 531, the clamping stroke of the clamping block 51 can be flexibly adjusted to adapt to different locking requirements. In this embodiment, please refer to Figure 4As shown, the outer end of the ball head 521 of the adjusting screw 52 has an internal hexagonal hole 5211. The tightening block 51 has an adjusting through hole 514 communicating with the internal hexagonal hole 5211. The adjusting through hole 514 extends laterally through both side walls of the tightening block 51, and the adjusting through hole 514 coincides with the center of the ball socket 512, ensuring that the internal hexagonal wrench can be easily aligned with the internal hexagonal hole 5211. After unfolding the folding connector, an internal hexagonal wrench can be inserted into the internal hexagonal hole 5211 through the adjusting through hole 514 and directly rotated to finely adjust the screw depth of the adjusting screw 52, ​​thereby flexibly adjusting the tightening stroke of the tightening block 51 to adapt to different locking requirements.

[0030] One side of the mating part 532 has an arc-shaped surface 5321, which abuts against the eccentric part 41 of the handle body 40. The arc-shaped surface design can increase the contact area between the two, reduce the wear of the eccentric part 41 during driving, and make the driving smoother and more stable.

[0031] In another embodiment, the eccentric portion 41 of the handle body 40 is hinged to the adjusting sleeve 53. Specifically, the mating portion 532 is provided with a hinge seat, and the eccentric portion 41 is hinged to the hinge seat via a pin, so that the eccentric portion 41 drives the adjusting sleeve 53 to move axially during rotation, thus achieving the same effect.

[0032] More preferably, the top of the connecting part 531 is provided with a set screw hole 533, which penetrates the side wall of the connecting part 531 and communicates with the inside of the sleeve for installing a set screw; after adjusting the relative position of the adjusting screw 52 and the adjusting sleeve 53, the set screw is screwed into the set screw hole 533, so that the end of the set screw presses against the side wall of the adjusting screw 52, ​​locking the two together and preventing the adjusting screw 52 and the adjusting sleeve 53 from rotating relative to each other due to vibration or other factors during use, thus ensuring stable tightening stroke.

[0033] Compared to traditional adjustment methods that use double nuts for locking or pins for fixing, this solution has significant advantages. Traditional methods require the installation of additional locking nuts or the insertion of cotter pins after adjustment, which is cumbersome and requires external tools to operate in narrow spaces. In contrast, the design of the set screw hole 533 at the top of the connecting part 531 in this solution allows both adjustment and locking actions to be completed with the tightening mechanism 50 installed in the lower connector 20. No additional parts need to be disassembled; the upper connector 10 and the lower connector 20 can be directly unfolded and operated with a wrench, which greatly simplifies the adjustment process and improves the convenience of maintenance.

[0034] The mounting base 54 is a circular cover structure with an upper cover 541 and a mounting groove. The mounting groove is provided with a top support plate 542, which is integrally formed with the upper cover 541. The top support plate 542 has three movable holes 5421, which are used to pass through the adjusting screw 52 and two movable rods 56 respectively. The adjusting screw 52 can be movably inserted into the middle movable hole 5421, and the two movable rods 56 can be movably inserted into the movable holes 5421 on both sides respectively, ensuring that the adjusting screw 52 and the movable rods 56 can move smoothly.

[0035] One side of the top plate 542 and the upper cover 541 form a receiving groove 543 for accommodating the clamping block 51. The size of the receiving groove 543 is adapted to the clamping block 51, which can limit and guide the clamping block 51. The other side of the top plate 542 and the upper cover 541 form a placement groove 544 for accommodating the compression spring 55, the adjusting screw 52 and the adjusting sleeve rod 53. The size of the placement groove 544 is adapted to the internal components. The placement groove 544 is provided with a notch 545. The size of the notch 545 is slightly larger than the connecting part 531 of the adjusting sleeve rod 53, so that the adjusting sleeve rod 53 can extend out and abut against the eccentric part 41.

[0036] The movable rod 56 has a head 561 and a rod portion 562, which are integrally formed. The diameter of the head 561 is larger than the diameter of the rod portion 562. The clamping block 51 is also provided with two symmetrical connecting holes 513. The connecting holes 513 are provided with internal threads. The rod portion 562 of the movable rod 56 is provided with external threads. The rod portion 562 of the movable rod 56 is movably inserted into the corresponding movable hole 5421 and threadedly connected to the connecting hole 513 on the clamping block 51, thereby realizing the fixed connection between the movable rod 56 and the clamping block 51.

[0037] In this embodiment, the tightening mechanism 50 adopts a double-spring reset structure. Two movable rods 56 are symmetrically arranged on both sides of the adjusting screw 52, ​​and each movable rod 56 is fitted with a compression spring 55. The heads 561 of both movable rods 56 simultaneously abut against the top support plate 542, forming a double-sided elastic support.

[0038] The clamping block 51 is subjected to symmetrical spring forces on both sides during movement, resulting in more balanced force distribution and avoiding the skewness or jamming caused by a single spring. It is especially suitable for scenarios where the clamping block 51 is heavy or experiences frequent working vibrations, and can significantly improve the reset stability and service life of the clamping mechanism 50.

[0039] Furthermore, the diameters of the ball head 521 of the adjusting screw 52 and the head 561 of the movable rod 56 are both larger than the inner diameter of the corresponding movable hole 5421. This ensures that the adjusting screw 52 and the movable rod 56 can move smoothly within the movable hole 5421, while also providing axial limiting and preventing disengagement. This prevents the adjusting screw 52 and the movable rod 56 from coming out of the movable hole 5421, thus improving the structural stability of the tightening mechanism 50.

[0040] In another embodiment, the compression spring 55 can be sleeved on the rod portion of the adjusting screw 52, ​​with one end abutting against the top plate 542 and the other end abutting against the side of the connecting portion 531; the head 561 of the movable rod 56 is omitted, and only the rod portion 562 is retained. The rod portion 562 is movably inserted through the movable hole 5421 and is clearance-fitted or threadedly connected to the connecting hole 513 of the tightening block 51. In this case, the movable rod 56 mainly plays a guiding role, and the spring force is directly borne by the adjusting sleeve rod 53.

[0041] This structure can also achieve elastic compression when locking and automatic return when unlocking. Compared with the structure of Embodiment 1, the head 561 of the movable rod 56 is omitted, and the compression spring 55 directly cooperates with the connecting part 531 of the adjusting sleeve rod 53. The structure is more compact and suitable for scenarios with limited installation space, thus expanding the application range of the product.

[0042] Please refer to Figure 4 As shown, when locking, rotating the handle body 40 upwards increases the eccentricity of the eccentric part 41 on the handle body 40, gradually pressing against the mating part 532 of the adjusting sleeve rod 53. Due to the contour curve design of the eccentric part 41, its thrust direction is always perpendicular to the arc surface 5321 of the mating part 532, driving the adjusting sleeve rod 53 to move axially towards the tightening block 51. The adjusting sleeve rod 53 drives the adjusting screw 52 to move synchronously within the movable hole 5421. The adjusting screw 52 pushes the tightening block 51 towards locking through the ball head 521. As the groove moves, the movable rod 56 moves with the tightening block 51. The head 561 of the movable rod 56 compresses the spring 55, causing the tightening part 511 of the tightening block 51 to tightly engage with the upper locking groove 12 of the upper connector 10 and the lower locking groove 22 of the lower connector 20, thus locking the upper connector 10 and the lower connector 20. Since the ball head 521 and the ball socket 512 are spherically matched, the tightening block 51 can adaptively adjust the angle, ensuring sufficient engagement area and locking force even if the upper locking groove 12 and the lower locking groove 22 are deformed.

[0043] Please refer to Figure 5As shown, when unlocking, the handle body 40 is rotated in the opposite direction, and the eccentricity of the eccentric part 41 gradually decreases. When the rotation radius of the eccentric part 41 is less than its base circle radius, the adjusting sleeve rod 53 loses the pushing force of the eccentric part 41, the compression spring 55 releases elastic potential energy, and generates a reaction force to push the movable rod 56 back to its original position. The movable rod 56 drives the tightening block 51 away from the locking groove. At the same time, the adjusting screw 52 and the adjusting sleeve rod 53 are reset under the reaction force of the spring, the tightening part 511 separates from the locking groove, and the upper connector 10 and the lower connector 20 can be rotated around the hinge shaft 30 to open.

[0044] Please refer to Figure 1 and Figure 2 As shown, the lower connector 20 has a notch 23 on its side wall. In this embodiment, the notch 23 is located away from the tightening block 51 and is situated on the side wall of the lower connector 20, forming a U-shaped or V-shaped opening. The notch 23 forms a stress-relieving structure on the side wall of the lower connector 20. When the tightening mechanism 50 is locked, the deformation of the lower connector 20 is mainly concentrated in the area near the lower locking groove 22, while the notch 23 can effectively absorb and release the stress concentration away from the locking position, preventing the lower connector 20 from undergoing irregular deformation as a whole, thereby providing a clear deformation compensation direction for the adaptive adjustment of the tightening block 51.

[0045] The lower connector 20 has two symmetrical through holes 24, located close to the hinge shaft 30. An adjusting screw 25 is installed within each through hole 24. After the upper connector 10 and the lower connector 20 are folded and locked by the tightening mechanism 50, a tool is used to screw the adjusting screw 25 appropriately through the through holes 24, causing the conical surface at the tip of the adjusting screw 25 to press against the contact surface of the upper connector 10. Due to the lever principle, the tightening force of the adjusting screw 25 causes a slight relative rotation between the upper connector 10 and the lower connector 20 at the hinge shaft 30, thereby eliminating the original rotational clearance and improving the overall rigidity of the folded connector.

[0046] When the locking mechanism 50 is released, the locking force between the upper connector 10 and the lower connector 20 is removed. At this time, the original rotational clearance at the hinge shaft 30 between the upper connector 10 and the lower connector 20 can be restored, which facilitates smooth opening and closing.

[0047] More preferably, the contact surface of the upper connector 10 is provided with a washer adapted to the adjusting screw 25. The washer is provided with an arc-shaped or conical groove that matches the conical surface at the top of the adjusting screw 25 to increase the contact area and prevent stress concentration.

[0048] This invention achieves the omnidirectional swing capability of the clamping block 51 through the spherical engagement of the ball head 521 and the ball socket 512. Even if the upper locking groove 12 and lower locking groove 22 experience wear and deformation or have machining errors due to long-term use, the clamping block 51 can adaptively adjust its posture to maintain full fit with the locking grooves on both sides. Simultaneously, the modularly designed clamping mechanism 50 can be disassembled as a whole for easy maintenance and replacement; the coordinated design of the adjusting screw 25 and the notch 23 improves the locking reliability and service life of the folding joint from two dimensions: gap elimination and deformation control.

[0049] The present invention also discloses a self-locking component 60 disposed on the handle body 40, which is used to prevent the handle body 40 from accidentally rotating and becoming loose after the folding joint is locked.

[0050] Please refer to Figure 6 and Figure 7 As shown, the outer wall of the upper connector 10 is provided with a snap-fit ​​portion 13. In this embodiment, the snap-fit ​​portion 13 is the head of an internal hexagon bolt, which is integrally welded and fixed to the upper connector 10, resulting in high structural strength and making it less prone to breakage and detachment. In other embodiments, the snap-fit ​​portion 13 may also be a boss integrally formed with the upper connector 10, or it may be detachably fixed by threaded fasteners, facilitating later maintenance, replacement, or adjustment of the installation position.

[0051] The handle body 40 is provided with a guide hole 42, which extends along the thickness direction of the handle body 40. The self-locking component 60 is movably disposed in the guide hole 42 and can move up and down between the locked position and the unlocked position.

[0052] Specifically, the self-locking assembly 60 includes a push button 61, a reset member 62, and a locking block 63. The push button 61 includes a pushing part 611 and a connecting part 612. The cross-sectional profile of the connecting part 612 matches the guide hole 42, allowing the connecting part 612 to slide up and down along the guide hole 42. The pushing part 611 is integrally formed on the outer end of the connecting part 612. The outer dimensions of the pushing part 611 are larger than the diameter of the guide hole 42, serving as a limit and manual operation function.

[0053] The inner side of the handle body 40 is provided with a stepped hole 43, which is coaxially connected with the guide hole 42, and the diameter of the stepped hole 43 is larger than the diameter of the guide hole 42, forming a stepped surface. The outline of the stepped hole 43 matches the shape of the locking block 63, and is used to accommodate and guide the locking block 63.

[0054] The top end of the guide hole 42 is connected to a groove 421, which is used to accommodate the reset member 62. A countersunk hole 6121 is provided above the connecting part 612. One end of the reset member 62 is disposed in the countersunk hole 6121 and abuts against the bottom wall of the countersunk hole, and the other end abuts against the inner side wall of the groove 421, forming a downward elastic force, so that the locking block 63 always tends to move closer to the latching part 13.

[0055] Below the guide hole 42, there is also a receiving hole 44. The locking part 13 can be accommodated in the receiving hole 44. That is, when the handle body is closed, the locking part 13 can be embedded in the receiving hole 44, providing precise positioning for the locking block 63 and the locking part 13 to engage, further improving the locking stability and avoiding self-locking failure caused by locking offset.

[0056] The locking block 63 is disposed within the stepped hole 43. The locking block 63 has a threaded hole and is threadedly connected to the inner end of the connecting part 612, so that the locking block 63 and the push button 61 form a whole that moves up and down synchronously. The locking block 63 has a locking part 631 at one end facing the latching part 13. The locking part 631 is an arc-shaped claw or a U-shaped latch that matches the outer contour of the latching part 13.

[0057] When the handle body 40 is rotated to the locked position, the latching part 13 is aligned with the locking part 631 of the locking block 63; the locking block 63 moves downward under the elastic force of the reset member 62, so that the locking part 631 and the latching part 13 form a latching engagement, restricting the reverse rotation of the handle body 40 and realizing self-locking.

[0058] Pushing the pushing part 611 upwards overcomes the elastic force of the reset part 62, causing the locking block 63 to move upwards. The locking part 631 disengages from the locking part 13, and the handle body 40 can be rotated in the opposite direction to unlock. The operation is simple and convenient.

[0059] In another embodiment, the reset element 62 can be replaced or supplemented by a magnetic element. A permanent magnet is provided on the handle body 40, and a magnetic attraction part is provided on the corresponding position of the outer wall of the upper connector 10, so that the handle body 40 is kept locked by magnetic force. This structure eliminates spring fatigue issues, has a longer service life, and provides a crisper and more precise operating feel.

[0060] The self-locking component 60 of the present invention, which is provided on the handle body 40, can realize the self-locking and unlocking of the handle body 40, prevent the folding joint from accidentally loosening after being locked, and ensure the safety and reliability of use.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A folding connector, comprising an upper connector, a lower connector, a hinge shaft, a handle body, and a clamping mechanism, wherein the upper connector, the handle body, and the lower connector are hinged together via the hinge shaft, and one hinged end of the handle body is provided with an eccentric portion; the inner sidewalls of the upper connector and the lower connector are respectively provided with an upper locking groove and a lower locking groove, characterized in that, The tightening mechanism includes a tightening block, an adjusting screw, and an adjusting sleeve. One side of the tightening block has a tightening part that mates with the upper and lower locking grooves, and the other side has a ball joint groove. One end of the adjusting screw has a ball head, and the other end is threaded to the adjusting sleeve. The ball head mates with the spherical surface of the ball joint groove, allowing the tightening block to swing in all directions. The adjusting sleeve engages with an eccentric part. When the handle body rotates, the eccentric part drives the adjusting sleeve, adjusting screw, and tightening block to move, thereby locking or unlocking.

2. The folding joint as described in claim 1, characterized in that, The clamping mechanism also includes a mounting base, which is detachably fixed to the lower connector. The mounting base is provided with a top support plate, and the top support plate is provided with a movable hole. The adjusting screw is movably inserted through the movable hole.

3. The folding joint as described in claim 2, characterized in that, One side of the top plate and the mounting base form a receiving groove, and the other side forms a placement groove. The receiving groove is used to receive the top clamping block, and the placement groove is used to receive the adjusting sleeve rod.

4. The folding joint as described in claim 2, characterized in that, The clamping mechanism also includes an elastic reset element, which is a compression spring. The compression spring is used to drive the clamping block to reset when unlocking.

5. The folding joint as described in claim 4, characterized in that, The clamping mechanism also includes a movable rod, one end of which is connected to the clamping block, and the other end of which is provided with a head. The compression spring is sleeved on the movable rod, with one end abutting against the top support plate and the other end abutting against the head.

6. The folding joint as described in claim 4, characterized in that, The compression spring is sleeved on the adjusting screw, with one end abutting against the top support plate and the other end abutting against the adjusting sleeve rod.

7. The folding joint as described in claim 1, characterized in that, The adjusting sleeve is provided with a set screw hole for installing a set screw to lock the adjusting screw.

8. The folding joint as described in claim 1, characterized in that, The adjusting sleeve includes a connecting part and a mating part. The connecting part is threadedly connected to the adjusting screw, and the mating part has an arc-shaped surface that abuts against the eccentric part.

9. The folding joint as described in claim 1, characterized in that, The lower connector has a notch on the side away from the clamping block.

10. The folding joint as described in claim 1, characterized in that, The lower connector is provided with an adjustment hole, and an adjustment screw is installed in the adjustment hole. Adjusting the adjustment screw can eliminate the rotational gap between the upper connector and the lower connector at the hinge shaft.

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