Folding cross structure and folding device

Abstract

The utility model discloses a folding cross structure and a folding device, and aims to overcome the defects that an existing folding structure is large in size after being folded, the sliding range in the folding process is large, and installation of other parts is affected. The lower parts of the two sliding support rods are hinged together, the upper parts of the two support rods are hinged together, two folding pull rods which are hinged together are arranged between the two support rods, the two folding pull rods are respectively hinged with the two support rods, the two support rods are rotatably connected with a limiting seat, and the limiting seat is provided with a movable slot. The two sliding supporting rods penetrate through the movable inserting grooves in the two limiting bases respectively. According to the folding cross structure, the size after folding and the sliding range in the folding process are greatly reduced.

Description

Technical Field

[0001] This utility model relates to a folding device, and more specifically, to a folding cross structure and a folding device. Background Technology

[0002] Currently, folding products such as folding tables, folding chairs, folding carts, and folding beds utilize folding structures for storage and use. They occupy little storage space, are easy to carry, and operate smoothly and reliably when unfolded. Existing single-cross structures consist of cross tubes, sliding blocks, and several rivets. The cross tubes rely on sliding blocks mounted on the table legs to retract and expand. For example, Chinese Patent Application No. 2023235804722 discloses a table that is easy to assemble and transport. In this table, the sliding blocks are mounted on the table legs, and during folding and unfolding, the sliding blocks slide along the table legs with a large sliding range. Furthermore, no other components can be installed on the table legs to prevent interference with the sliding blocks' movement. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides a folding cross structure and folding device, which greatly reduces the folding size and sliding range.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a folding cross structure, including two sliding support rods and two support rods, the lower parts of the two sliding support rods are hinged together, the upper parts of the two support rods are hinged together, two hinged folding rods are provided between the two support rods, the two folding rods are respectively hinged to the two support rods, and a limiting seat is rotatably connected to the two support rods. The limiting seat is provided with a movable slot, and the two sliding support rods respectively pass through the movable slots on the two limiting seats.

[0005] The two sliding rods and two support rods are rotatably connected to other components, with the connection points serving as stress points. The fixed points are relatively fixed, eliminating the need for sliding blocks on other components. When the folding cross structure is unfolded, the two sliding rods and two support rods are extended, increasing the angle between the two sliding rods and the two support rods. The two folding rods are straightened for positioning. During unfolding, the sliding rods slide in the movable slots on the limiting seats, which can rotate during this process to prevent jamming during unfolding and folding. When the folding cross structure is folded, the entire structure is brought towards the center, reducing the angle between the two sliding rods and the two support rods, and the two folding rods are folded together.

[0006] The two sliding rods pass through the movable slots on the two limit seats respectively. During the folding and unfolding process, the connection positions of the two sliding rods and the two support rods with other components remain unchanged. The stabilizing effect is achieved by the self-locking of the folding rod, which greatly reduces the size after folding and the sliding range during the folding process. This structure can be applied to folding tables, folding chairs and folding trolleys, etc.

[0007] Preferably, the two support rods are hinged by a rotating connector, which includes two rotating joints hinged together, and the two rotating joints are respectively fastened to the two support rods.

[0008] When connecting the two support rods, first insert the two rotary joints into the ends of the two support rods respectively, and then tighten them with screws. Then, hinge the two rotary joints together through the hinge shaft. The connection is convenient and reliable.

[0009] Preferably, the movable slot extends to both ends of the limiting seat, creating clearance gaps at both ends of the limiting seat.

[0010] During the folding process of the cross structure, the angle between the two sliding rods decreases, thereby driving the limiting seat to rotate. After folding to the correct position, the sliding rods are inserted into the clearance notch, and the sliding rods can be parallel to the limiting seat, which can minimize the angle between the two sliding rods and thus reduce the size after folding.

[0011] Preferably, the hinge axes of the two sliding rods coincide with the hinge axes of the two folding tie rods.

[0012] By aligning the rotation axes, the unfolding and folding of the entire folding and cross structure becomes smoother, preventing any jamming.

[0013] As a preferred embodiment, a limiting head is provided on one pair of folding rods, and when fully unfolded, the other pair of folding rods is supported on the limiting head to achieve a limiting position.

[0014] After the two pairs of folding rods are unfolded and straightened, the limiting head acts as a self-locking mechanism for the folding rods, thereby ensuring the stability of the entire folding cross structure.

[0015] Preferably, the two sliding support rods are hinged to a rotating seat, and the two folding tie rods are also hinged to the rotating seat. The rotating seat includes two hinge joints that are hinged together, and the two hinge joints are respectively fastened to the two sliding support rods.

[0016] When connecting two sliding support rods, first insert the two hinge joints into the ends of the two sliding support rods respectively, and tighten them in place with screws. Then, hinge the two hinge joints together through the hinge shaft, making the connection convenient and reliable.

[0017] Preferably, mounting holes are provided on both sides of the movable slot, and the limiting seat is connected to the support rod through a mounting hole.

[0018] When connecting the limit seat to the support rod, you can choose any mounting hole to hinge with the support rod, which is more convenient.

[0019] A folding cross device includes a table frame, which includes two folding frames arranged at the front and back, a folding cross structure connecting the two folding frames, two sliding support rods rotatably connected to the upper part of the two folding frames, and two support rods rotatably connected to the lower part of the two folding frames.

[0020] The folding cross structure is applied to a folding table. A folding cross structure is installed between two folding frames positioned front and back. The two folding frames move closer together and further apart to fold and unfold the table. During this process, the folding cross structure folds and unfolds accordingly. Then, the folding frames are folded left and right to complete the entire folding process. The connection positions of the sliding struts and support rods to the folding frames are fixed relative to the frames, which helps to reduce the size of the folded table and the sliding range during the folding process.

[0021] A folding cross device includes a chair frame, which includes two opposing support frames. A folding cross structure is connected between the two support frames. Two sliding rods are rotatably connected to the lower part of the two support frames, and two support rods are rotatably connected to the upper part of the two support frames.

[0022] The folding cross structure is applied to folding chairs. The folding cross structure is installed between two support frames arranged on the left and right. The two support frames move closer and further apart to realize the folding and unfolding of the folding chair. During this process, the folding cross structure folds and unfolds accordingly.

[0023] A folding cross device includes a trolley frame, which includes two opposing frame bodies. A folding cross structure is connected between the two frame bodies. Two sliding support rods are rotatably connected to the lower part of the two frame bodies, and two support rods are rotatably connected to the upper part of the two frame bodies.

[0024] The folding cross structure is applied to the folding trolley. The folding cross structure is installed between the two left and right frame bodies. The two left and right frame bodies move closer and further apart to realize the folding and unfolding of the folding trolley. During this process, the folding cross structure folds and unfolds along with it. Then the frame body is folded back and forth to complete the entire folding process.

[0025] Compared with the prior art, the beneficial effects of this utility model are: (1) The two sliding rods pass through the movable slots on the two limit seats respectively. During the folding and unfolding process, the connection positions of the two sliding rods and the two support rods with other components remain unchanged. The stabilizing effect is achieved by the self-locking of the folding rods, which greatly reduces the size after folding and the sliding range during the folding process; (2) The two folding rods can self-lock after unfolding and straightening, so that the entire folding cross structure achieves a stabilizing effect; (3) The folding cross structure can be applied to folding devices such as folding tables, folding chairs and folding trolleys, and has good versatility. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the folding cross structure of this utility model.

[0027] Figure 2 This is an exploded view of the folded cross structure of this utility model.

[0028] Figure 3 This is a diagram of the folded cross structure of this utility model in its folded state.

[0029] Figure 4 This is a structural diagram of the folding cross structure of this utility model used in a folding table.

[0030] Figure 5 This is a structural diagram of the folding cross structure of this utility model used in a folding chair.

[0031] Figure 6 This is a structural diagram of the folding cross structure of this utility model used in a folding trolley.

[0032] In the diagram: 1. Sliding support rod, 2. Support rod, 3. Folding tie rod, 4. Limiting head, 5. Safety hole, 6. Tie rod bar, 7. External connecting part, 8. Internal connecting part, 9. Limiting seat, 10. Movable slot, 11. Mounting hole, 12. Clearance notch, 13. Rotating connector, 14. Rotating joint, 15. Insertion slot, 16. Connecting plate, 17. Clamping plate, 18. Rotating seat, 19. Hinge joint, 20. Insertion hole, 21. Turntable, 22. Clamping plate, 23. Positioning column, 24. Folding frame, 25. Upright, 26. Horizontal bar, 27. Self-locking rod, 28. Upper support, 29. Lower support, 30. Support frame, 31. Frame body, 32. Base frame, 33. Seat, 34. Connecting rod, 35. Wheel. Detailed Implementation

[0033] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0034] Example 1: A folding cross structure (see...) Figure 1 , Figure 2 , Figure 3 The system includes two sliding support rods 1 and two support rods 2. Both sliding support rods 1 and support rods 2 are hollow tubular structures with oval cross-sections. The lower parts of the two sliding support rods 1 are hinged together in a V-shape, and the upper parts of the two support rods 2 are hinged together in a V-shape. The openings of the two V-shapes face opposite directions, one upwards and the other downwards.

[0035] Two hinged folding rods 3 are installed between the two support rods 2. Each folding rod 3 is hinged to one of the two support rods 2. One folding rod 3 has an outwardly protruding limiting head 4. When fully unfolded, the other folding rod 3 is supported by the limiting head 4 for limiting. After the two folding rods 3 are unfolded and straightened, the limiting head 4 acts as a self-locking mechanism, thus ensuring the stability of the entire folding cross structure. Each folding rod 3 has a safety hole 5. After the two folding rods 3 are unfolded and straightened, a locking pin is inserted into the safety hole 5 to achieve reliable self-locking. Before folding, the locking pin is removed to prevent jamming.

[0036] The folding lever 3 includes two oppositely arranged lever strips 6. The two lever strips 6 of one folding lever 3 are sandwiched between the two lever strips 6 of another folding lever 3. The outer two lever strips 6 are provided with outwardly protruding outer connecting parts 7 on their sides, and the inner two lever strips 6 are provided with outwardly protruding inner connecting parts 8 at their ends. The inner connecting parts 8 and the outer connecting parts 7 are provided correspondingly and are hinged together.

[0037] Two support rods 2 are rotatably connected to limit seats 9, and the limit seats 9 are provided with movable slots 10. Two sliding support rods 1 pass through the movable slots 10 on the two limit seats 9 respectively. Mounting holes 11 are provided on both sides of the movable slots 10, and the limit seats 9 are connected to the support rods 2 through one of the mounting holes 11. The movable slots 10 extend to the upper and lower ends of the limit seats 9, forming clearance notches 12 at the upper and lower ends of the limit seats 9. When the limit seats 9 are connected to the support rods 2, any one of the mounting holes 11 can be selected for hinged connection with the support rods 2, making it more convenient. During the folding process of the folding cross structure, the included angle between the two sliding support rods 1 decreases, thereby driving the limit seats 9 to rotate. After folding to the correct position, the sliding support rods 1 are inserted into the clearance notches 12, and the sliding support rods 1 can be in a parallel state with the limit seats 9, minimizing the included angle between the two sliding support rods 1, thus reducing the size after folding.

[0038] The two support rods 2 are hinged together by a rotating connector 13, which includes two hinged rotating joints 14, each of which is securely connected to one of the support rods 2. Each rotating joint 14 has an insertion slot 15, a connecting plate 16 on one rotating joint 14, and two clamping plates 17 on the other rotating structure. The two connecting plates 16 are rotatably connected between the two clamping plates 17. When connecting the two support rods 2, the insertion slots 15 on the two rotating joints 14 are first inserted into the ends of the two support rods 2 and tightened with screws. Then, the connecting plate 16 of one rotating joint 14 is inserted between the two clamping plates 17 of the other rotating joint 14, and the connection is made by hinge shaft, making the connection convenient and reliable.

[0039] Two sliding support rods 1 are hinged together by a rotating seat 18. Two folding tie rods 3 are also hinged to the rotating seat 18. The rotating seat 18 includes two hinge joints 19 hinged together, each fastened to one of the two sliding support rods 1. Each hinge joint 19 has an insertion hole 20. One hinge joint 19 has a turntable 21, and the other hinge joint 19 has two clamping plates 22. The turntable 21 is hinged between the two clamping plates 22. When connecting the two sliding support rods 1, the insertion holes 20 on the two hinge joints 19 are first inserted into the ends of the two sliding support rods 1 and secured with screws. Then, the turntable 21 on one hinge joint 19 is inserted between the two clamping plates 22 on the other hinge joint 19, and the connection is made via a hinge shaft, ensuring a convenient and reliable connection. A positioning post 23 is installed between the outer connecting part 7 on the tie rod 6 and the clamping plate 22. The hinge shaft connected to the clamping plate 22 and the turntable 21 passes through the positioning post 23, the outer connecting part 7, and the inner connecting part 8 to realize the hinge of the two pairs of folding tie rods 3, so that the hinge axis of the two sliding support rods 1 coincides with the hinge axis of the two pairs of folding tie rods 3.

[0040] A folding cross device (see) Figure 4 The table includes a table frame with a tabletop mounted on it to form a folding table. The table frame consists of two folding frame bodies 24 arranged front and back, with the tabletop positioned between the two folding frame bodies 24. Folding cross structures are connected between the left and right sides of the two folding frame bodies 24. Two sliding support rods 1 are rotatably connected to the upper part of the two folding frame bodies 24, and two support rods 2 are rotatably connected to the lower part of the two folding frame bodies 24.

[0041] The folding frame 24 includes two uprights 25 and two crossbars 26. One end of each crossbar 26 is hinged together, and the other end of each upright is hinged to one of the crossbars 26. Two self-locking rods 27 are hinged between the crossbars 26 and the uprights 25, and are hinged together. An upper support 28 is securely connected to the upper part of each upright 25, and a lower support 29 is securely connected to the lower part of each upright 25. The upper end of the sliding support rod 1 is hinged to the upper support 28, and the lower end of the support rod 2 is hinged to the lower support 29. The two folding frames 24 move closer together and further apart to fold and unfold the table. During this process, the folding cross structure folds and unfolds accordingly. Then, the folding frame 24 is folded left and right to complete the entire folding process.

[0042] Example 2: A folding cross structure (see Figure 1 , Figure 2 , Figure 3 The system includes two sliding support rods 1 and two support rods 2. Both sliding support rods 1 and support rods 2 are hollow tubular structures with oval cross-sections. The lower parts of the two sliding support rods 1 are hinged together in a V-shape, and the upper parts of the two support rods 2 are hinged together in a V-shape. The openings of the two V-shapes face opposite directions, one upwards and the other downwards.

[0043] Two hinged folding rods 3 are installed between the two support rods 2. Each folding rod 3 is hinged to one of the two support rods 2. One folding rod 3 has an outwardly protruding limiting head 4. When fully unfolded, the other folding rod 3 is supported by the limiting head 4 for limiting. After the two folding rods 3 are unfolded and straightened, the limiting head 4 acts as a self-locking mechanism, thus ensuring the stability of the entire folding cross structure. Each folding rod 3 has a safety hole 5. After the two folding rods 3 are unfolded and straightened, a locking pin is inserted into the safety hole 5 to achieve reliable self-locking. Before folding, the locking pin is removed to prevent jamming.

[0044] The folding lever 3 includes two opposing lever bars 6. The two lever bars 6 of one folding lever 3 are sandwiched between the two lever bars 6 of another folding lever 3. The outer two lever bars 6 are provided with outwardly protruding outer connecting parts 7 on their sides, and the inner two lever bars 6 are provided with outwardly protruding inner connecting parts 8 at their ends. The inner connecting parts 8 and the outer connecting parts 7 are provided correspondingly and are hinged together.

[0045] Two support rods 2 are rotatably connected to limit seats 9, and the limit seats 9 are provided with movable slots 10. Two sliding support rods 1 pass through the movable slots 10 on the two limit seats 9 respectively. Mounting holes 11 are provided on both sides of the movable slots 10, and the limit seats 9 are connected to the support rods 2 through one of the mounting holes 11. The movable slots 10 extend to the upper and lower ends of the limit seats 9, forming clearance notches 12 at the upper and lower ends of the limit seats 9. When the limit seats 9 are connected to the support rods 2, any one of the mounting holes 11 can be selected for hinged connection with the support rods 2, making it more convenient. During the folding process of the folding cross structure, the included angle between the two sliding support rods 1 decreases, thereby driving the limit seats 9 to rotate. After folding to the correct position, the sliding support rods 1 are inserted into the clearance notches 12, and the sliding support rods 1 can be in a parallel state with the limit seats 9, minimizing the included angle between the two sliding support rods 1, thus reducing the size after folding.

[0046] The two support rods 2 are hinged together by a rotating connector 13, which includes two hinged rotating joints 14, each of which is securely connected to one of the support rods 2. Each rotating joint 14 has an insertion slot 15, a connecting plate 16 on one rotating joint 14, and two clamping plates 17 on the other rotating structure. The two connecting plates 16 are rotatably connected between the two clamping plates 17. When connecting the two support rods 2, the insertion slots 15 on the two rotating joints 14 are first inserted into the ends of the two support rods 2 and tightened with screws. Then, the connecting plate 16 of one rotating joint 14 is inserted between the two clamping plates 17 of the other rotating joint 14, and the connection is made by hinge shaft, making the connection convenient and reliable.

[0047] Two sliding support rods 1 are hinged together by a rotating seat 18. Two folding tie rods 3 are also hinged to the rotating seat 18. The rotating seat 18 includes two hinge joints 19 hinged together, each fastened to one of the two sliding support rods 1. Each hinge joint 19 has an insertion hole 20. One hinge joint 19 has a turntable 21, and the other hinge joint 19 has two clamping plates 22. The turntable 21 is hinged between the two clamping plates 22. When connecting the two sliding support rods 1, the insertion holes 20 on the two hinge joints 19 are first inserted into the ends of the two sliding support rods 1 and secured with screws. Then, the turntable 21 on one hinge joint 19 is inserted between the two clamping plates 22 on the other hinge joint 19, and the connection is made via a hinge shaft, ensuring a convenient and reliable connection. A positioning post 23 is installed between the outer connecting part 7 on the tie rod 6 and the clamping plate 22. The hinge shaft connected to the clamping plate 22 and the turntable 21 passes through the positioning post 23, the outer connecting part 7, and the inner connecting part 8 to realize the hinge of the two pairs of folding tie rods 3, so that the hinge axis of the two sliding support rods 1 coincides with the hinge axis of the two pairs of folding tie rods 3.

[0048] A folding cross device (see) Figure 5 The chair includes a chair frame, on which a seat is mounted to form a folding chair. The chair frame includes two opposing support frames 30, with folding cross structures connecting the front and rear sides of the two support frames 30. Two sliding support rods 1 are rotatably connected to the lower part of the two support frames 30, and two support rods 2 are rotatably connected to the upper part of the two support frames 30. The folding and unfolding of the chair is achieved by the two support frames 30 moving closer and further apart, during which the folding cross structures fold and unfold accordingly.

[0049] Example 3: A folding cross structure (see Figure 1 , Figure 2 , Figure 3 The system includes two sliding support rods 1 and two support rods 2. Both sliding support rods 1 and support rods 2 are hollow tubular structures with oval cross-sections. The lower parts of the two sliding support rods 1 are hinged together in a V-shape, and the upper parts of the two support rods 2 are hinged together in a V-shape. The openings of the two V-shapes face opposite directions, one upwards and the other downwards.

[0050] Two hinged folding rods 3 are installed between the two support rods 2. Each folding rod 3 is hinged to one of the two support rods 2. One folding rod 3 has an outwardly protruding limiting head 4. When fully unfolded, the other folding rod 3 is supported by the limiting head 4 for limiting. After the two folding rods 3 are unfolded and straightened, the limiting head 4 acts as a self-locking mechanism, thus ensuring the stability of the entire folding cross structure. Each folding rod 3 has a safety hole 5. After the two folding rods 3 are unfolded and straightened, a locking pin is inserted into the safety hole 5 to achieve reliable self-locking. Before folding, the locking pin is removed to prevent jamming.

[0051] The folding lever 3 includes two opposing lever bars 6. The two lever bars 6 of one folding lever 3 are sandwiched between the two lever bars 6 of another folding lever 3. The outer two lever bars 6 are provided with outwardly protruding outer connecting parts 7 on their sides, and the inner two lever bars 6 are provided with outwardly protruding inner connecting parts 8 at their ends. The inner connecting parts 8 and the outer connecting parts 7 are provided correspondingly and are hinged together.

[0052] Two support rods 2 are rotatably connected to limit seats 9, and the limit seats 9 are provided with movable slots 10. Two sliding support rods 1 pass through the movable slots 10 on the two limit seats 9 respectively. Mounting holes 11 are provided on both sides of the movable slots 10, and the limit seats 9 are connected to the support rods 2 through one of the mounting holes 11. The movable slots 10 extend to the upper and lower ends of the limit seats 9, forming clearance notches 12 at the upper and lower ends of the limit seats 9. When the limit seats 9 are connected to the support rods 2, any one of the mounting holes 11 can be selected for hinged connection with the support rods 2, making it more convenient. During the folding process of the folding cross structure, the included angle between the two sliding support rods 1 decreases, thereby driving the limit seats 9 to rotate. After folding to the correct position, the sliding support rods 1 are inserted into the clearance notches 12, and the sliding support rods 1 can be in a parallel state with the limit seats 9, minimizing the included angle between the two sliding support rods 1, thus reducing the size after folding.

[0053] The two support rods 2 are hinged together by a rotating connector 13, which includes two hinged rotating joints 14, each of which is securely connected to one of the support rods 2. Each rotating joint 14 has an insertion slot 15, a connecting plate 16 on one rotating joint 14, and two clamping plates 17 on the other rotating structure. The two connecting plates 16 are rotatably connected between the two clamping plates 17. When connecting the two support rods 2, the insertion slots 15 on the two rotating joints 14 are first inserted into the ends of the two support rods 2 and tightened with screws. Then, the connecting plate 16 of one rotating joint 14 is inserted between the two clamping plates 17 of the other rotating joint 14, and the connection is made by hinge shaft, making the connection convenient and reliable.

[0054] Two sliding support rods 1 are hinged together by a rotating seat 18. Two folding tie rods 3 are also hinged to the rotating seat 18. The rotating seat 18 includes two hinge joints 19 hinged together, each fastened to one of the two sliding support rods 1. Each hinge joint 19 has an insertion hole 20. One hinge joint 19 has a turntable 21, and the other hinge joint 19 has two clamping plates 22. The turntable 21 is hinged between the two clamping plates 22. When connecting the two sliding support rods 1, the insertion holes 20 on the two hinge joints 19 are first inserted into the ends of the two sliding support rods 1 and secured with screws. Then, the turntable 21 on one hinge joint 19 is inserted between the two clamping plates 22 on the other hinge joint 19, and the connection is made via a hinge shaft, ensuring a convenient and reliable connection. A positioning post 23 is installed between the outer connecting part 7 on the tie rod 6 and the clamping plate 22. The hinge shaft connected to the clamping plate 22 and the turntable 21 passes through the positioning post 23, the outer connecting part 7, and the inner connecting part 8 to realize the hinge of the two pairs of folding tie rods 3, so that the hinge axis of the two sliding support rods 1 coincides with the hinge axis of the two pairs of folding tie rods 3.

[0055] A folding cross device (see) Figure 6 The trolley includes a trolley frame with a cloth bag mounted on it to form a folding trolley. The trolley frame comprises two opposing frame bodies 31, with folding cross structures connecting the front and rear sides of the two frame bodies 31. Two sliding support rods 1 are rotatably connected to the lower parts of the two frame bodies 31, and two support rods 2 are rotatably connected to the upper parts of the two frame bodies 31. A base frame 32 is installed between the two frame bodies 31, supporting the cloth bag. The base frame 32 includes a seat 33 and four connecting rods 34 hinged to the seat 33. Two connecting rods 34 are hinged to the front and rear of the left frame body 31, and the other two connecting rods 34 are hinged to the front and rear of the right frame body 31. Wheels 35 are mounted on the front and rear of each frame body 31.

[0056] The two frame bodies 31 positioned on the left and right move closer and further apart to achieve the folding and unfolding of the folding trolley. During this process, the folding cross structure folds and unfolds along with it. Then, the frame bodies 31 are folded back and forth to complete the entire folding process.

[0057] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A folding cross structure, characterized in that, It includes two sliding support rods and two support rods. The lower parts of the two sliding support rods are hinged together, and the upper parts of the two support rods are hinged together. Two hinged folding rods are set between the two support rods. The two folding rods are respectively hinged to the two support rods. Limit seats are rotatably connected to the two support rods. The limit seats are provided with movable slots. The two sliding support rods pass through the movable slots on the two limit seats respectively.

2. The folding cross structure according to claim 1, characterized in that, The two support rods are hinged together by a rotating connector, which includes two rotating joints that are hinged together, and the two rotating joints are respectively fastened to the two support rods.

3. The folding cross structure according to claim 1, characterized in that, The movable slot extends to both ends of the limit seat, creating clearance gaps at both ends of the limit seat.

4. The folding cross structure according to claim 1, characterized in that, The hinge axes of the two sliding support rods coincide with the hinge axes of the two folding tie rods.

5. A folding cross structure according to claim 1, characterized in that, One pair of folding rods is equipped with a limit head. When fully unfolded, the other pair of folding rods is supported by the limit head to achieve the limit.

6. A folding cross structure according to claim 1, characterized in that, The two sliding support rods are hinged to the rotating seat, and the two folding tie rods are also hinged to the rotating seat. The rotating seat includes two hinge joints that are hinged together, and the two hinge joints are respectively fastened to the two sliding support rods.

7. A folding cross structure according to any one of claims 1 to 6, characterized in that, Mounting holes are provided on both sides of the movable slot, and the limit seat is connected to the support rod through a mounting hole.

8. A folding cross device, characterized in that, The table includes a table frame, which comprises two folding frames arranged front and back, and the two folding frames are connected by a folding cross structure as described in any one of claims 1 to 7. Two sliding support rods are rotatably connected to the upper part of the two folding frames, and two support rods are rotatably connected to the lower part of the two folding frames.

9. A folding cross device, characterized in that, The chair frame includes two opposing support frames, and the two support frames are connected by a folding cross structure as described in any one of claims 1 to 7. Two sliding support rods are rotatably connected to the lower part of the two support frames, and two support rods are rotatably connected to the upper part of the two support frames.

10. A folding cross device, characterized in that, The trolley frame includes two opposing frame bodies connected to each other by a folding cross structure as described in any one of claims 1 to 7. Two sliding support rods are rotatably connected to the lower part of the two frame bodies, and two support rods are rotatably connected to the upper part of the two frame bodies.

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