Double-positioning folding joint device of bicycle

Abstract

The invention belongs to the field of bicycle folding joints, and discloses a bicycle double-positioning folding joint device which comprises a first connector and a second connector, the first connector is connected with a fixing shaft, and the second connector is rotationally connected with the fixing shaft; the first positioning device comprises a first positioning plate, the first positioning plate is provided with a first positioning groove, the first positioning plate is fixedly connected with the second connector, the first connector is rotationally connected with a first rotating shaft, the first rotating shaft is connected with a first torsional spring, and the first rotating shaft is connected with a hook-shaped buckle; the handle is rotationally connected with the first connector; a limiting device; a second positioning device; according to the technical scheme, through the arrangement of the handle, the limiting device, the first positioning device, the second positioning device and other structures, the problems that a single positioning mode is prone to loosening and shaking are effectively solved, the using stability of the folding connector is greatly improved, and the safety and reliability of a bicycle in the riding process are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bicycle folding joints, in particular to a double positioning folding joint device of a bicycle. BACKGROUND

[0002] In the current process of urbanization and the increasing popularity of green travel, folding bicycles and folding electric vehicles have become an important choice for commuting, short-distance travel and outdoor leisure due to their flexibility, portability and space-saving advantages. The core function of such vehicles is highly dependent on folding connection structures, and the folding joint, as a key component of the structure, directly bears the important mission of connecting the two sides of the frame and switching between folding and unfolding. Its performance directly determines the safety, comfort and service life of the vehicle.

[0003] Most of the mainstream bicycle folding joint devices on the market currently use a single positioning locking structure design. In the unfolded and ridden state of the vehicle, only one set of positioning components (such as a single buckle, latch or bolt) is used to fix the joint. However, this single positioning method has many defects that cannot be avoided in the long-term use process. First, the vibration impact generated during bicycle riding and the repeated load caused by road bumps can accelerate the wear and fatigue deformation of the positioning components, and long-term accumulation can lead to a decrease in positioning accuracy and loose connection, which can cause radial or circumferential movement between the joints, seriously affecting the stability and comfort of riding, and may also cause frame noise and uneven stress. Second, the single positioning structure lacks redundancy protection, and once the positioning component fails (such as the buckle breaks or the latch falls off), it will directly cause the folding joint to be unlocked accidentally, posing a great safety hazard to the rider, especially at high speed or in complex road conditions, which can easily cause traffic accidents.

[0004] At the same time, the operation control mechanism of the existing folding joint also has room for optimization. Most folding joints currently use a rotating handle to achieve locking or loosening, but the existing design does not have a reliable limiting and fixing structure for the handle in the locked state. In daily use scenarios, it is inevitable that the vehicle will be scratched or hooked during parking and handling, or the handle will be accidentally contacted by clothing, backpack straps, etc. during riding, which can cause unintended swinging of the handle and disengage from the locked position, causing the folding joint to be unlocked accidentally. This design flaw not only affects safety, but also may require the user to repeatedly lock due to frequent accidental unlocking, reducing the convenience of use.

[0005] In summary, the existing bicycle folding joint device still has obvious shortcomings in positioning stability, locking reliability, adaptability and use convenience, and cannot fully meet the high-quality needs of users for safety and practicality of folding vehicles. SUMMARY

[0006] The present application intends to provide a double-position folding joint device of a bicycle to solve the problems presented in the background.

[0007] To achieve the above-mentioned purposes, the present application provides the following technical solutions: A double-position folding joint device of a bicycle, comprising, a first connecting head connected with a fixed shaft, and a second connecting head rotationally connected with the fixed shaft; a first positioning device comprising a first positioning plate provided with a first positioning groove, the first positioning plate being fixedly connected with the second connecting head, the first connecting head being rotationally connected with a first rotating shaft connected with a first torsional spring, the first rotating shaft being connected with a hook-shaped buckle, the hook-shaped buckle being matched with the first positioning groove; a handle rotationally connected with the first connecting head, the handle being used to limit the rotation of the hook-shaped buckle and the second connecting head; a limiting device used to limit the rotation of the handle; a second positioning device connected with the second connecting head, the second positioning device being used to position the second connecting head and the first connecting head.

[0008] Preferably, the second positioning device comprises a second positioning block, the first connecting head is connected with a positioning rod, the fixed shaft is connected with the positioning rod, the positioning rod is provided with a second positioning groove, the second connecting head is provided with a second sliding groove, the second positioning block is slidingly connected with the second sliding groove, the second positioning block is connected with a second return spring, the second return spring is connected with the inner side wall of the second sliding groove, the second connecting head is connected with a second limiting plate, the second limiting plate is provided with a second limiting groove, the second positioning block is connected with a pushing block, and the pushing block is slidingly connected with the second limiting groove.

[0009] Preferably, the limiting device comprises a first sliding block, the handle is provided with a first sliding groove, the first sliding block is slidingly connected with the first sliding groove, the first sliding block is connected with a first return spring, the first return spring is connected with the inner side wall of the first sliding groove, the first sliding block is provided with a fixing groove, the handle is connected with a first limiting plate, the first limiting plate is provided with a first limiting groove, the second connecting head is connected with a fixing rod, the fixing rod is connected with a fixing block, the fixing block is slidingly connected with the fixing groove and the first limiting groove, the inner side wall of the fixing groove is provided with a clamping groove, and the fixing block is matched with the clamping groove.

[0010] Preferably, the fixing block is in a semispherical shape, the diameter of the connecting surface of the fixing block and the fixing rod is greater than the diameter of the fixing rod, and the bottom side wall of the fixing groove is obliquely arranged.

[0011] Preferably, the second connecting head is rotationally connected with a second rotation shaft, the second rotation shaft is connected with a second torsional spring, the second rotation shaft is connected with a positioning column, the top of the positioning column is provided in a semispherical shape, the handle is provided with a spherical groove, and the positioning column and the spherical groove are matched with each other.

[0012] Preferably, the positioning column is threadedly connected with the second rotation shaft.

[0013] Preferably, the second positioning groove is provided with two groups, and the two groups of second positioning grooves are respectively located on the left and right sides of the positioning rod.

[0014] Preferably, the first connecting head is provided in a C-shaped cross section, the first connecting head is threadedly connected with an adjusting screw, and the adjusting screw is threadedly connected with both ends of the first connecting head.

[0015] Compared with the prior art, the technical scheme has the beneficial effects that: The first positioning device, the second positioning device and the handle are arranged, the first connecting head and the second connecting head are positioned and fixed through the three devices, the use stability of the first connecting head and the second connecting head during locking is greatly improved, the first positioning device is positioned and fixed through the cooperation of the hook-shaped buckle and the first positioning groove, the second positioning device is further positioned through the sliding connection of the second positioning block and the second positioning groove, the double positioning structures are coordinated with each other, the problem that a single positioning mode is prone to loosening and shaking is effectively avoided, the stability of the folding joint is greatly improved, and the safety and reliability of the bicycle during riding are ensured; the handle is limited through the limiting device, the handle can also limit the first connecting head and the second connecting head, and the rotation of the handle itself is also limited, the situation that the folding structure is unlocked due to external accidental touch is avoided, the handle can also limit the hook-shaped buckle, and the use stability of the folding joint is further improved; and the overall structure is simple, when folding is needed, the handle only needs to be pressed and rotated, so that the use is convenient, time and labor are saved.

[0016] (2) The second positioning groove is provided with two groups and is respectively arranged on the left and right sides of the positioning rod, can adapt to the unfolding and folding states of the connecting head, and further enhances the comprehensiveness of positioning; the side wall of the fixed block close to the handle is provided in an arc shape, and the side wall of the fixed groove at the bottom is provided in an inclined manner, so that the friction loss between components is reduced, the wear degree during long-term use is reduced, and the fixed block can be better and more smoothly inserted into the clamping groove; the first rotation shaft and the second rotation shaft are respectively provided with the first torsional spring and the second torsional spring, the second positioning block is provided with the second return spring, and the first sliding block is provided with the first return spring, so that the elastic components can ensure that each moving component is quickly returned after operation, effectively buffer the impact force during component movement, reduce rigid collision of components, and prolong the service life of the overall device.

[0017] (3) The first connector of this technical solution has a C-shaped cross section and is threaded with an adjusting screw. The adjusting screw is threaded to both ends of the first connector. Users can flexibly adjust the clamping degree of the first connector by adjusting the adjusting screw, so that it can be adapted to bicycle frame parts of different specifications, which greatly improves the compatibility range of the device and enhances the practicality and versatility of the product. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a front view of the present invention; Figure 4 This is a front sectional view of the present invention; Figure 5 for Figure 4 Enlarged view at point B in the middle; Figure 6 for Figure 4 Enlarged view at point C; Figure 7 for Figure 4 Enlarged view at point D; Figure 8 This is a bottom sectional view of the first connector provided by the present invention; Figure 9 This is a schematic diagram of the structure of the hook-shaped buckle and the first positioning plate when they are engaged, as provided by the present invention. Figure 10 This is a schematic diagram of the positioning post provided by the present invention; Figure 11 This is a schematic diagram of the structure of the fixing block provided by the present invention; Figure 12 A schematic diagram of the handle provided by the present invention; Figure 13 This is a schematic diagram of the structure at the second positioning block provided by the present invention; Reference numerals: 1. First connector; 2. Second connector; 3. Handle; 4. Fixed shaft; 5. Positioning rod; 6. Second positioning groove; 7. Adjusting screw; 8. Fixed rod; 9. First sliding groove; 10. First limiting plate; 11. First limiting groove; 12. Hook-shaped buckle; 13. First torsion spring; 14. First positioning plate; 15. First positioning groove; 16. Second rotating shaft; 17. Positioning post; 18. Spherical groove; 19. Second torsion spring; 20. Second positioning block; 21. Second sliding groove; 22. Second return spring; 23. Second limiting plate; 24. Second limiting groove; 25. Toggle block; 26. First return spring; 27. Slot; 28. Fixed block; 29. ​​Fixed groove; 30. First rotating shaft; 31. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: like Figures 1 to 13 The illustrated bicycle dual-positioning folding joint device includes, First connector 1 and second connector 2, the first connector 1 is connected to a fixed shaft 4, and the second connector 2 is rotatably connected to the fixed shaft 4; The first positioning device includes a first positioning plate 15, which has a first positioning groove 16. The first positioning plate 15 is fixedly connected to the second connector 2. The first connector 1 is rotatably connected to a first rotating shaft 31, which is connected to a first torsion spring 14. The end of the first torsion spring 14 is connected to the first connector 1. The first rotating shaft 31 is connected to a hook-shaped buckle 13, which is L-shaped. The upper end of the hook-shaped buckle 13 cooperates with the first positioning groove 16. The upper end of the hook-shaped buckle 13 has a barb, which can cooperate with the first torsion spring 14 to allow the upper end of the hook-shaped buckle 13 to pass through the first positioning groove 16 and lock onto the side wall of the first positioning groove 16, thus completing the locking. In this way, the rotation of the first positioning plate 15 can be restricted by the hook-shaped buckle 13, thereby restricting the rotation of the second connector 2 relative to the first connector 1, so that the second connector 2 and the first connector 1 can be relatively stably maintained in the unfolded state. Handle 3 is rotatably connected to the first connector 1, and the rotatable connection point between handle 3 and the first connector 1 is located opposite the fixed shaft 4. Handle 3 is used to restrict the rotation of the hook-shaped buckle 13 and the second connector 2; Figure 3 and Figure 4As shown, when the handle 3 is in a vertical position, the upper end of the handle 3 is located to the left of the second connector 2; the rotation of the handle 3 is restricted by a limiting device; the limiting device includes a first sliding block 10, the handle 3 is provided with a first sliding groove 9, the first sliding block 10 is slidably connected to the first sliding groove 9, the first sliding block 10 is connected to a first return spring 27, the first return spring 27 is connected to the inner wall of the first sliding groove 9, the first sliding block 10 is provided with a fixing groove 30, the fixing groove 30 is square, the handle 3 is connected to a first limiting plate 11, the first limiting plate 11 closes the opening on the left side of the first sliding groove 9, the first limiting plate 11 is provided with a first limiting groove 12, the first limiting groove 12 penetrates the first limiting plate 11, the second connector 2 is connected to a fixing rod 8, the fixing rod 8 is slidably connected to the fixing groove 30, that is, the left end of the fixing rod 8 passes through the first limiting groove 12 and is located inside the fixing groove 30, the fixing rod 8 is connected to a fixing block 29, the bottom inner wall of the fixing groove 30 is provided with a slot 28, the fixing block 29 and the slot 28 cooperate with each other. When the fixing block 29 is engaged in the slot 28, the handle 3 cannot rotate relative to the first connector 1; the lower end of the handle 3 is located above the hook-shaped buckle 13, preventing accidental contact with the hook-shaped buckle 13 and restricting its rotation; the side wall of the fixing block 29 near the handle 3 is arc-shaped, and the bottom side wall of the fixing slot 30 is inclined downwards, such as... Figure 6 As shown, this configuration allows the fixing block 29 to quickly enter the fixing groove 30 and insert into the card slot 28 when the handle 3 is rotated clockwise, making operation more convenient. like Figure 5 As shown, the lower end of the handle 3 is L-shaped, so that when the handle 3 is rotated counterclockwise, the side wall of the handle 3 can gradually contact the hook-shaped buckle 13 and cause the hook-shaped buckle 13 to rotate.

[0020] The second connector 2 is rotatably connected to a second rotating shaft 17, which is connected to a second torsion spring 20 and a positioning post 18. The top of the positioning post 18 is hemispherical, and the handle 3 has a spherical groove 19 in the middle. The positioning post 18 and the spherical groove 19 cooperate with each other, and the top of the positioning post 18 can be inserted into the spherical groove 19. The torque of the second torsion spring 20 further restricts the rotation of the handle 3 relative to the first connector 1. The positioning post 18 is threadedly connected to the second rotating shaft 17, so the distance between the top of the positioning post 18 and the second rotating shaft 17 can be adjusted, so that the positioning post 18 can be stably inserted into the spherical groove 19 to achieve the limiting function. The second positioning device is connected to the second connector 2 and is used for positioning the second connector 2 and the first connector 1. The second positioning device includes a second positioning block 21. The first connector 1 is connected to a positioning rod 5, and a fixed shaft 4 is connected to the positioning rod 5. The positioning rod 5 is provided with a second positioning groove 6. The second positioning block 21 and the second positioning groove 6 cooperate with each other. There are two sets of second positioning grooves 6. Figure 7As shown, two sets of second positioning grooves 6 are located on the left and right sides of the positioning rod 5, respectively. The second connector 2 is provided with a second sliding groove 22. The second positioning block 21 is slidably connected to the second sliding groove 22. The second positioning block 21 is connected to a second return spring 23, which is connected to the inner wall of the second sliding groove 22. The second connector 2 is connected to a second limiting plate 24, which is located below the second sliding groove 22. The second limiting plate 24 closes the opening below the second sliding groove 22. The second limiting plate 24 is provided with a second limiting groove 25, the width of which is smaller than the width of the second sliding groove 22, thereby preventing the second positioning block 21 from sliding down from the second sliding groove 22. The second positioning block 21 can slide stably left and right along the second sliding groove 22. The sliding block is connected to a toggle block 26, which is slidably connected to the second limiting groove 25, and the lower end of the toggle block 26 passes through the limiting groove and is located below the second limiting plate 24. By moving the toggle block 26, the second positioning block 21 can move left or right along the second sliding groove 22, thereby causing the second positioning block 21 to slide out of the second positioning groove 6, releasing the positioning, and allowing the second connector 2 to rotate relative to the first connector 1. After reaching the designated position, under the action of the second return spring 23, the second positioning block 21 is driven to re-insert into the corresponding second positioning groove 6, completing the positioning function again.

[0021] like Figure 8 As shown, the first connector 1 has a C-shaped cross-section. The first connector 1 is threadedly connected to an adjusting screw 7. There are three sets of adjusting screws 7. The adjusting screws 7 are threadedly connected to both ends of the first connector 1. Tightening the adjusting screws 7 can adjust the distance between the two ends of the first connector 1, thereby adjusting the clamping degree of the first connector 1. In actual installation, a sleeve can also be set below the first connector 1 for installation.

[0022] The specific implementation process is as follows: like Figures 1 to 7As shown, at this time, the axes of the first connector 1 and the second connector 2 are on the same straight line, and the folding joint is in the unfolded state. At this time, the second positioning block 21 is inserted into the second positioning groove 6 on the left side under the rightward push of the second return spring 23, which plays a positioning role for the second connector 2; the end of the hook-shaped buckle 13 with barbs is stuck on the side wall of the first positioning groove 16, and the force of the first torsion spring 14 makes the end of the hook-shaped buckle 13 with barbs stably stuck on the side wall of the first positioning groove 16, and then through the hook-shaped buckle 13 and The engagement of the first torsion spring 14 prevents the first positioning plate 15 from rotating, thereby restricting the rotation of the second connector 2 relative to the first connector. At this time, the handle 3 is in a vertical position and is limited by the limiting device. The lower end of the handle 3 is located above the hook-shaped buckle 13. The distance between the hook-shaped buckle 13 and the lower end of the handle 3 is less than 2mm. The external medium cannot cause the hook-shaped buckle 13 to rotate counterclockwise to release the engagement between the hook-shaped buckle 13 and the first positioning groove 16. Therefore, the hook-shaped buckle 13 can stably complete the positioning and limiting of the second connector 2. At this time, the limiting device performs its limiting function, restricting the counterclockwise rotation of handle 3, such as Figure 6 As shown, at this time, the fixing block 29 at the left end of the fixing rod 8 is located in the slot 28, and the fixing block 29 cannot move left or right relative to the slot 28. Due to the setting of the first return spring 27, the first return spring 27 will give the first sliding block 10 a continuous upward push, so that the fixing block 29 can be stably inserted into the slot 28, thus preventing the handle 3 from rotating relative to the first connector 1, and also preventing the second connector 2 from rotating relative to the first connector 1, further completing the limitation of the second connector 2 and the first connector 1; at the same time, the upper end of the positioning post 18 is also inserted into the ball groove 19. When the handle 3 rotates, it will drive the positioning post 18 to rotate together. However, due to the setting of the second torsion spring 20, the second torsion spring 20 will transmit its torque to the positioning post 18 through the second rotating shaft 17, so that the handle 3 must overcome the torque of the second torsion spring 20 to rotate, further completing the limitation of the handle 3; thus, the folding joint can be used stably when unfolded.

[0023] When the handle 3 needs to be folded, press down on the first sliding block 10. The first sliding block 10 slides down, allowing the fixing block 29 to slide out of the slot 28, thereby releasing the restriction between the fixing block 29 and the slot 28. At this time, the handle 3 can be rotated counterclockwise directly. At this time, the rotation of the handle 3 only needs to overcome the torque of the second torsion spring 20. As the handle 3 continues to rotate, the upper end of the positioning group gradually slides out of the spherical groove 19, and the counterclockwise rotation of the handle 3 is no longer restricted. As the handle 3 continues to rotate counterclockwise, the left side wall of the handle 3 gradually abuts against the hook-shaped buckle 13. As the handle 3 continues to rotate counterclockwise, the side wall of the handle 3 pushes the hook-shaped buckle 13 downward, causing the hook-shaped buckle 13 to also rotate counterclockwise against the torque of the first torsion spring 14. As a result, the upper end of the hook-shaped buckle 13 with barbs gradually stops engaging with the side wall of the first limiting groove 12, thereby releasing the hook-shaped buckle. The buckle 13 limits the first positioning plate 15. When the second connector 2 rotates relative to the first connector 1, it rotates around the fixed shaft 4. However, due to the position of the rotation shaft of the second connector 2, the second positioning block 21 does not restrict the clockwise rotation of the second connector 2 relative to the first connector 1. At this time, the second connector 2 can be rotated clockwise directly, thereby allowing the second connector 2 to rotate relative to the first connector 1 to complete the folding. After folding, the second positioning block 21 is inserted into the second positioning groove 6 on the right side under the pushing force of the second return spring 23. Due to the elastic force of the second return spring 23, stable positioning can be achieved, realizing positioning during folding. At this time, the counterclockwise rotation of the second positioning block 21 can be restricted through the cooperation of the second positioning block 21 and the second positioning groove 6, that is, the second connector 2 is restricted from rotating from the folded state to the unfolded state. When the folding connector needs to be unfolded, move the actuating block 26 to overcome the elastic force of the second return spring 23, causing the second positioning block 21 to slide out of the second positioning groove 6 on the right side along the second sliding groove 22. At this time, the second connector 2 can be rotated counterclockwise around the fixed shaft 4. After the second connector 2 is rotated counterclockwise, the actuating block 26 can be released. At this time, the end of the second positioning block 21 abuts against the positioning rod 5, which does not affect the rotation of the second connector 2. Then, move the handle 3 to rotate the hook-shaped buckle 13 counterclockwise to the maximum angle, which does not affect the second connector 2. When the second connector 2 is fully extended, it can no longer rotate counterclockwise relative to the first connector 1. At this time, the second positioning block 21 is reinserted into the second positioning groove 6 on the left side under the elastic force of the second return spring 23. Then, the handle 3 is rotated clockwise. As the handle 3 rotates clockwise, the upper end of the handle 3 gradually approaches the fixing block 29, and the lower end of the handle 3 gradually releases its contact with the hook-shaped buckle 13. As the handle 3 rotates clockwise, the lower end of the handle 3 gradually no longer contacts the hook-shaped buckle 13. Under the force of the first torsion spring 14, the latch 13 rotates clockwise, causing the upper end of the hook-shaped latch 13 to pass through the first limiting groove 12 and engage with the side wall of the first limiting groove 12 again, thus limiting the second connector 2 once more. As the handle 3 rotates clockwise, the fixing block 29 gradually passes through the first limiting groove 12 and abuts against the lower side wall of the second sliding groove 22. Since the lower side wall of the second sliding groove 22 is inclined downwards and the left side of the fixing block 29 is arc-shaped, as the handle 3 continues to rotate clockwise... As the needle rotates, the first sliding block 10 is pushed downward, causing the first return spring 27 to be compressed. As the handle 3 continues to rotate clockwise, the fixing block 29 is positioned above the slot 28. At this time, the fixing block 29 no longer abuts against the side wall of the first sliding groove 9. The first return spring 27 gives the first sliding block 10 an upward thrust, causing the first sliding block 10 to move upward, thereby causing the fixing block 29 to be inserted into the slot 28, completing the locking process again. As the handle 3 rotates clockwise, the positioning pin 18 will also be inserted into the spherical groove 19 again.

[0024] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A double-positioning folding joint device for bicycles, characterized in that: include, A first connector (1) and a second connector (2), wherein the first connector (1) is connected to a fixed shaft (4), and the second connector (2) is rotatably connected to the fixed shaft (4); The first positioning device includes a first positioning plate (15), the first positioning plate (15) is provided with a first positioning groove (16), the first positioning plate (15) is fixedly connected to a second connector (2), the first connector (1) is rotatably connected to a first rotating shaft (31), the first rotating shaft (31) is connected to a first torsion spring (14), the first rotating shaft (31) is connected to a hook-shaped buckle (13), and the hook-shaped buckle (13) cooperates with the first positioning groove (16); Handle (3), the handle (3) is rotatably connected to the first connector (1), the handle (3) is used to restrict the rotation of the hook buckle (13) and the second connector (2); A limiting device, the limiting device being used to limit the rotation of the handle (3); The second positioning device is connected to the second connector (2) and is used for positioning the second connector (2) and the first connector (1).

2. The double-positioning folding joint device for bicycles as described in claim 1, characterized in that: The second positioning device includes a second positioning block (21), the first connector (1) is connected to a positioning rod (5), the fixed shaft (4) is connected to the positioning rod (5), the positioning rod (5) is provided with a second positioning groove (6), the second connector (2) is provided with a second sliding groove (22), the second positioning block (21) is slidably connected to the second sliding groove (22), the second positioning block (21) is connected to a second return spring (23), the second return spring (23) is connected to the inner side wall of the second sliding groove (22), the second connector (2) is connected to a second limiting plate (24), the second limiting plate (24) is provided with a second limiting groove (25), the second positioning block (21) is connected to a toggle block (26), the toggle block (26) is slidably connected to the second limiting groove (25).

3. The double-positioning folding joint device for bicycles as described in claim 1, characterized in that: The limiting device includes a first sliding block (10), the handle (3) is provided with a first sliding groove (9), the first sliding block (10) is slidably connected to the first sliding groove (9), the first sliding block (10) is connected to a first return spring (27), the first return spring (27) is connected to the inner wall of the first sliding groove (9), the first sliding block (10) is provided with a fixing groove (30), the handle (3) is connected to a first limiting plate (11), the first limiting plate (11) is provided with a first limiting groove (12), the second connector (2) is connected to a fixing rod (8), the fixing rod (8) is connected to a fixing block (29), the fixing block (29) is slidably connected to both the fixing groove (30) and the first limiting groove (12), the inner wall of the fixing groove (30) is provided with a slot (28), and the fixing block (29) and the slot (28) cooperate with each other.

4. The double-positioning folding joint device for bicycles as described in claim 3, characterized in that: The fixing block (29) is hemispherical, and the diameter of the connecting surface between the fixing block (29) and the fixing rod (8) is larger than the diameter of the fixing rod (8). The bottom sidewall of the fixing groove (30) is inclined.

5. The double-positioning folding joint device for bicycles as described in claim 1, characterized in that: The second connector (2) is rotatably connected to a second rotating shaft (17), the second rotating shaft (17) is connected to a second torsion spring (20), the second rotating shaft (17) is connected to a positioning post (18), the top of the positioning post (18) is hemispherical, the handle (3) is provided with a spherical groove (19), and the positioning post (18) and the spherical groove (19) cooperate with each other.

6. The double-positioning folding joint device for bicycles as described in claim 5, characterized in that: The positioning pin (18) is threadedly connected to the second rotating shaft (17).

7. The double-positioning folding joint device for bicycles as described in claim 2, characterized in that: The second positioning groove (6) is provided in two sets, and the two sets of the second positioning groove (6) are located on the left and right sides of the positioning rod (5) respectively.

8. The double-positioning folding joint device for bicycles as described in claim 1, characterized in that: The first connector (1) has a C-shaped cross-section and is threaded with an adjusting screw (7). The adjusting screw (7) is threaded to both ends of the first connector (1).

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