Foldable structure of support

Abstract

The foldable structure comprises at least two sets of supports, connecting pieces are fixedly arranged at one ends of the supports, every two adjacent connecting pieces are rotationally connected to form a chain, each chain is provided with a head end and a tail end, and a positioning piece is jointly connected between the head end and the tail end. The positioning piece is used for connecting or disconnecting the head end and the tail end; in the unfolding state, the head end and the tail end are connected, all the connecting pieces are connected end to end to form a closed-loop and fixed structure, all the supports are arranged in a radial mode with the axis P of the closed loop as the center, and enough stability and bearing capacity are achieved. In the folding state, the head end and the tail end are separated, the supports can be folded to form a parallel structure through rotation of the connecting pieces, the connecting lines of the center points Q of the connecting pieces are located on the same horizontal line, the overall size is greatly reduced, and the space utilization rate during storage and transportation is remarkably optimized.

Description

Technical Field

[0001] This invention belongs to the technical field of support structures, and specifically relates to a foldable support structure. Background Technology

[0002] In actual production, traditional foldable support structures often sacrifice rigidity and stability in the unfolded state while pursuing the ultimate folded size and lightweight design. This results in insufficient stability and limited load-bearing capacity when unfolded, or a failure to achieve foldability while maintaining stability in the unfolded state, leading to a large overall footprint and a difficulty in balancing stability and portability. This is especially problematic in scenarios requiring frequent switching between unfolded and folded storage states, where the operational complexity of traditional supports severely limits their application. Furthermore, even when folded, traditional supports still occupy a significant amount of space, with the folding effect not being very noticeable, resulting in wasted space during storage and transportation. Therefore, designing a support structure that ensures stability in the unfolded state while achieving efficient space utilization in the folded state has become a pressing technical challenge. Summary of the Invention

[0003] (1) Technical problems to be solved This invention discloses a foldable structure for a bracket, which aims to solve the problems of insufficient stability, large space occupation, and inconvenience in storage and carrying of existing brackets during use.

[0004] (2) Technical solution This invention discloses a foldable structure of a bracket, comprising at least two sets of brackets. One end of each bracket is fixedly provided with a connector. Adjacent connectors are rotatably connected to each other to form a chain. The chain has a head end and an end end. A positioning member is connected between the head end and the end end. The positioning member is used to connect or disconnect the head end and the end end. In the unfolded state, the first end and the last end are connected, the connectors are connected end to end, and the line connecting the center points Q of each connector forms a closed loop structure. Each bracket is arranged radially with the axis P of the closed loop as the center. In the folded state, the first end and the last end are separated, and each bracket can be folded into a parallel structure by rotating the connector, and the line connecting the center points Q of each connector is on the same horizontal line.

[0005] Furthermore, the support includes a horizontal support and a vertical support arranged in an "L" shape, and the connector is located at the connection between the horizontal support and the vertical support.

[0006] Furthermore, the connector has a complementary first side and a second side, the first side having a hinge groove, and the second side having a hinge block adapted to the hinge groove, the hinge block engaging with the hinge groove.

[0007] Furthermore, the hinge slot has a first shaft hole on its longitudinal end face, and the hinge block has a second shaft hole that matches the first shaft hole. The first shaft hole and the second shaft hole are connected by a hinge shaft.

[0008] Furthermore, the hinge groove is a cylindrical groove centered on the first shaft hole, with an arc-shaped protrusion on the first side that matches the cylindrical groove, and an arc-shaped groove on the second side that matches the arc-shaped protrusion. When the hinge block engages with the hinge groove and rotates around the hinge axis, the arc-shaped edge of the arc-shaped groove slides against the arc-shaped edge of the arc-shaped protrusion.

[0009] Furthermore, the first side includes a first inner side and a first outer side, and the arc-shaped protrusion is located between the first inner side and the first outer side; the second side includes a second inner side and a second outer side, and the arc-shaped groove is located between the second inner side and the second outer side. In the unfolded state, the first inner side of each connector is tightly fitted with the second inner side of the adjacent connector; In the folded state, the first outer side of each connector is tightly fitted with the second outer side of the adjacent connector.

[0010] Furthermore, the positioning element is the hinge shaft that ultimately forms a closed loop.

[0011] Furthermore, the connector is provided with a mounting groove that is adapted to the longitudinal support, and the side wall of the mounting groove is provided with a notch that is adapted to the transverse support, so that the mounting groove together wraps the end of the transverse support and the longitudinal support that are connected to each other.

[0012] Furthermore, the connector is provided with a positioning hole that penetrates the mounting groove, and the transverse bracket and the longitudinal bracket are respectively provided with connecting holes that correspond to and communicate with the positioning hole. The positioning hole and the connecting hole are connected and fixed by a locking member.

[0013] Furthermore, the longitudinal support is provided with a laterally extending support leg at the end away from the transverse support, and the extension direction of the support leg is the same as the extension direction of the corresponding transverse support.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting connectors on the bracket, the connectors rotate and connect with each other, and the positioning elements enable the bracket to quickly switch between unfolded and folded states. On the one hand, when the bracket is unfolded, the connectors are fixed to form a closed-loop structure, ensuring that the bracket can unfold stably in a radial pattern and has sufficient stability and load-bearing capacity, providing users with a sturdy and flat support platform suitable for various scenarios. On the other hand, when folded, the brackets can rotate around the hinge points of the connectors and eventually arrange themselves in parallel, greatly reducing the overall volume and significantly optimizing its space utilization during storage and transportation. The positioning elements enable the bracket of this application to achieve instantaneous switching between "flexible folding" and "rigid locking", making it more practical. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the support frame of the present invention in its unfolded state.

[0016] Figure 2 This is a schematic diagram of the overall structure of the bracket of the present invention in a folded state.

[0017] Figure 3 This is a partial structural diagram of the bracket of the present invention in a folded state.

[0018] Figure 4 This is a partial structural diagram of the support frame of the present invention in its unfolded state.

[0019] Figure 5 This is a schematic diagram of the overall structure of the connector of the present invention.

[0020] Figure 6 This is a partial cross-sectional view of the bracket of the present invention in a folded state.

[0021] Figure 7 This is a schematic diagram of the hinge shaft of the present invention.

[0022] Figure 8 This is a schematic diagram of the structure of different sides of the connector of the present invention.

[0023] Figure 9 This is a schematic diagram showing the connection state of adjacent connecting members when the bracket of the present invention is in the unfolded state.

[0024] Figure 10 This is a schematic diagram of the connection state of adjacent connectors when the bracket of the present invention is in the folded state.

[0025] Figure 11 This is a partial exploded view of the connector, transverse support, longitudinal support, and reinforcing rib structure of the present invention.

[0026] Reference numerals: 1-bracket, 11-transverse bracket, 12-longitudinal bracket, 121-support foot, 122-insert, 13-connecting hole, 14-reinforcing rib, 2-connector, 21-chain, 211-head end, 212-end end, 22-first side, 221-hinge groove, 222-first shaft hole, 223-arc-shaped protrusion, 224-first inner side, 225-first outer side, 23-second side, 231-hinge block, 232-second shaft hole, 233-arc-shaped groove, 234-second inner side, 235-second outer side, 24-hinge shaft, 241-strip protrusion, 25-mounting groove, 251-notch, 26-positioning hole, 3-positioning element. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figure 1-4 As shown, this invention discloses a foldable support structure, comprising at least two sets of supports 1. One end of each support 1 is fixedly provided with a connector 2. Adjacent connectors 2 are rotatably connected to each other to form a chain 21. The chain 21 connects each support 1 together. The chain 21 has a head end 211 and an end end 212. A positioning element 3 is connected between the head end 211 and the end end 212. The positioning element 3 is used to connect or disconnect the head end 211 and the end end 212. In the unfolded state, when the first end 211 and the last end 212 are connected and fixed by the positioning member 3, the connecting members 2 are connected end to end, and the line connecting the center points Q of each connecting member 2 forms a closed loop (e.g., Figure 4 As shown), at this time, each of the connecting parts 2 forms a fixed structure, and each of the brackets 1 is arranged radially with the axis P of the closed loop as the center. In this state, since each of the brackets 1 has sufficient stability and load-bearing capacity under the connection structure of each of the connecting parts 2, the user can use the brackets 1 in the corresponding scenarios, such as home drying, outdoor activities or holding items. In the folded state, the first end 211 and the last end 212 separate, breaking the fixed state between each of the connecting members 2. That is, each of the connecting members 2 regains its hinged degree of freedom, and each of the connecting members 2 can rotate around the connection point, driving the bracket 1 to rotate and fold to form a parallel structure. Moreover, the line connecting the center points Q of each of the connecting members 2 is on the same horizontal line (e.g., Figure 3 As shown in the figure, the bracket 1 can be compactly folded, reducing the space occupied and ensuring that the components can be neatly arranged in the folded state, which is convenient for storage and transportation and greatly improves the ease of use.

[0029] Specifically, such as Figure 1 As shown, the support 1 includes a transverse support 11 and a longitudinal support 12 arranged in an "L" shape. The longitudinal support 12 provides support for the transverse support 11, ensuring the stability of the entire structure in the unfolded state. The connector 2 is located at the connection between the transverse support 11 and the longitudinal support 12. The other side of the connector 2 is screwed to the longitudinal support 12, so that a stable connection is formed between the transverse support 11 and the longitudinal support 12.

[0030] In practical applications, users can use the bracket 1 as a clothes rack or to hold items; simply place clothes or items requiring support on the horizontal support 11. Alternatively, by placing the entire tabletop on the horizontal support 11, the bracket 1 can be transformed into a simple table, convenient for outdoor or temporary use. Furthermore, due to the folding function of the bracket 1, users can easily store it in small spaces, such as a car trunk or storage cabinet, when not in use, greatly improving its flexibility and practicality.

[0031] Furthermore, such as Figure 5-6 As shown, the connector 2 has a complementary first side 22 and a second side 23. The first side 22 is provided with a hinge groove 221, and the hinge groove 221 is provided with a first shaft hole 222 on its longitudinal end face. The second side 23 is provided with a hinge block 231 that is adapted to the hinge groove 221. The hinge block 231 is provided with a second shaft hole 232 that is adapted to the first shaft hole 222. The opening of the hinge groove 221 is arranged outward to facilitate the insertion of the hinge block 231. During assembly, the hinge block 231 is inserted into the hinge groove 221 of the adjacent connector 2, so that the first shaft hole 222 and the second shaft hole 232 correspond to each other. Then, the hinge shaft 24 passes through the first shaft hole 222 and the second shaft hole 232, thereby realizing the hinge between the adjacent connectors 2. When the hinge blocks 231 of each connector 2 are hinged to the adjacent hinge slots 221 via the hinge shafts 24, the connectors 2 are connected to form the chain 21. When the chain 21 rotates at each hinge point and the beginning 211 and the end 212 are connected via the positioning element 3, the chain 21 forms a stable closed-loop structure, thereby ensuring that each bracket 1 remains in a fixed position in the unfolded state and does not loosen or shift. This structure not only enhances the stability of the overall structure but also effectively avoids accidental folding or deformation caused by external forces, further improving the safety of use.

[0032] It should be noted that in this embodiment, the positioning element 3 is essentially the hinge shaft 24 that finally forms a closed loop. Since the hinge shaft 24 that finally forms a closed loop can be inserted after all the connecting elements 2 are hinged together, a fixed structure can be formed between the connecting elements 2. Therefore, the present invention defines the hinge shaft 24 that finally forms a closed loop as the positioning element 3. The setting of the positioning element 3 makes it more convenient to switch the bracket 1 between the unfolded and folded states. Users can complete the state conversion with simple operation, which improves the flexibility and efficiency of use.

[0033] Furthermore, such as Figure 7 As shown, to ensure the connection stability and smooth rotation of the hinge shaft 24 within the first shaft hole 222 and the second shaft hole 232, both ends of the hinge shaft 24 are smooth cylindrical structures, and several strip-shaped protrusions 241 are arranged around the middle. During assembly, the strip-shaped protrusions 241 are located within the second shaft hole 232 of the hinge block 231 and form a tight abutment or interference fit with the inner wall of the second shaft hole 232. In this way, the strip-shaped protrusions 241 increase the friction between the hinge shaft 24 and the second shaft hole 232, so that the hinge shaft 24 will not easily move out of the shaft hole, thus ensuring the stability of the connection of the hinge shaft 24. The two ends of the hinge shaft 24 are respectively connected to the first shaft hole 222, facilitating rotation at both ends of the hinge shaft 24. Furthermore, the smooth cylindrical structure at both ends effectively reduces frictional resistance, making the rotation process smoother. In addition, the length of the hinge shaft 24 is designed to be slightly greater than the total depth of the first shaft hole 222 and the second shaft hole 232, ensuring that after installation, the ends of the hinge shaft 24 have sufficient slack for easy disassembly, replacement, and maintenance of the various connecting parts 2.

[0034] Preferably, the first shaft hole 222 on the upper end face of the hinge groove 221 is not through the connector 2, which makes it easier to keep the outer surface of the connector 2 clean and beautiful, and at the same time avoids external impurities from entering the shaft hole due to through setting, thereby affecting the stability and service life of the hinge.

[0035] Preferably, to facilitate the insertion and removal of the positioning member 3 from the shaft hole, the entire hinge shaft 24 of the positioning member 3 can be set as a smooth cylindrical structure, so that it can fit tightly when inserted into the shaft hole, but is not too difficult to pull out, so that the user can easily unfold and fold the bracket 1 in actual operation.

[0036] Furthermore, such as Figure 8-10 As shown, the hinge groove 221 is a cylindrical groove centered on the first shaft hole 222. The first side 22 is provided with an arc-shaped protrusion 223 that matches the cylindrical groove, and the second side 23 is provided with an arc-shaped groove 233 that matches the arc-shaped protrusion 223. Thus, when the hinge block 231 and the hinge groove 221 are engaged and connected and fixed by the hinge shaft 24, the arc-shaped protrusion 223 and the arc-shaped groove 233 abut against each other. When rotating, the arc-shaped groove 233 slides against the arc-shaped protrusion 223. Through this sliding of the arc-shaped edge, the user can feel obvious damping during operation, thereby more accurately controlling the unfolding and folding state of the bracket 1. Furthermore, the combination of the arc-shaped protrusion 223 and the arc-shaped groove 233 not only enhances the tightness of the hinge structure, but also effectively limits the rotation angle, preventing damage to the connector 2 or instability of the overall structure of the bracket 1 due to excessive rotation.

[0037] Furthermore, the first side 22 includes a first inner side 224 and a first outer side 225, and the arc-shaped protrusion 223 is located between the first inner side 224 and the first outer side 225; the second side 23 includes a second inner side 234 and a second outer side 235, and the arc-shaped groove 233 is located between the second inner side 234 and the second outer side 235. When the bracket 1 is in the unfolded state, the first inner side 224 of each connector 2 is tightly fitted with the second inner side 234 of the adjacent connector 2 (e.g., Figure 9 As shown in the diagram, when the connectors 2 are connected end to end to form a closed loop, and the brackets 1 are arranged radially with the axis P as the center, the first inner side 224 and the adjacent second inner side 234 are configured to fit together and splice to form a complete, gapless circular structure. Under this structure, the connectors 2 are seamlessly connected, which can not only effectively avoid loosening or misalignment caused by external forces, but also provide users with a flatter and more reliable support plane in the unfolded state. In addition, it can also ensure the accuracy of the rotation angle of the connectors 2 and prevent damage to the connectors 2 due to excessive rotation.

[0038] When the bracket 1 is in the folded state, the first outer side 225 of each connector 2 is tightly fitted with the second outer side 235 of the adjacent connector 2 (e.g., Figure 10 As shown), the first outer side 225 and the adjacent second outer side 235 are configured to fit together and splice to form a complete, gapless straight structure, ensuring that the center points of each connector 2 are on the same horizontal line. Thus, the space occupied by multiple brackets 1 when unfolded can be reduced to only the thickness space of the bracket 1 by folding, which greatly improves the space utilization of the bracket 1 during storage and transportation, making it convenient for users to store and carry.

[0039] In this embodiment, there are four brackets 1 and four connectors 2. When the bracket 1 is in the unfolded state, each connector 2 can fit together to form a seamless circular structure on the side near the axis P. Therefore, the angle formed by the intersection of the extension lines of the first inner side 224 and the second inner side 234 on the same connector 2 is 90°. When there are six brackets 1, the angle formed by the intersection of the extension lines of the first inner side 224 and the second inner side 234 on the same connector 2 is 60°, and so on. In practical applications, the number of brackets 1 can be adjusted according to the actual situation, making it more flexible and convenient to use.

[0040] In some embodiments, the structure of the hinge groove 221 and the hinge block 231 is not limited to the "concave" and "convex" mating structure described in this embodiment. For example, it can also be an "L"-shaped mating structure with opposite top and bottom, that is, the hinge groove 221 is set as an "L"-shaped groove, and the hinge block 231 is designed as a matching "L"-shaped protrusion. This structure can also achieve stable hinge between adjacent connecting parts 2, and is easier to align and insert during assembly, and saves more material.

[0041] Furthermore, such as Figure 11 As shown, one end of the longitudinal support 12 is provided with a transverse through-hole 122, which is adapted to the transverse support 11. The transverse support 11 is inserted into the longitudinal support 12 through the through-hole 122 to form an "L" shaped structure. The connector 2 is provided with a mounting groove 25 adapted to the longitudinal support 12. The side of the mounting groove 25 is provided with a notch 251 adapted to the transverse support 11. During installation, the transverse support 11 and the longitudinal support 12 are respectively aligned with the notch 251 and the mounting groove 25 of the connector 2 and inserted into it. The ends of the transverse support 11 and the longitudinal support 12 that are connected to each other can be inserted into the mounting groove 25 to realize the connection between the transverse support 11, the longitudinal support 12 and the connector 2.

[0042] To further improve the stability of the connection between the connector 2 and the transverse support 11 and the longitudinal support 12, the connector 2 is also provided with a positioning hole 26 that penetrates the mounting groove 25. The transverse support 11 and the longitudinal support 12 are respectively provided with connecting holes 13 that correspond to and communicate with the positioning hole 26. When the transverse support 11 and the longitudinal support 12 are both located in the mounting groove 25, by using locking elements (such as positioning pins or bolts) to pass through the positioning hole 26 and the connecting hole 13 in sequence, the transverse support 11, the longitudinal support 12 and the connector 2 can be firmly fixed together, thereby enhancing the stability of the overall structure and ensuring that it will not loosen or fall off due to external forces during use.

[0043] In this embodiment, the horizontal support 11 is a long, rectangular structure, and the vertical support 12 is a cylindrical structure. The rectangular structure of the horizontal support 11 provides a larger contact surface when the support 1 is in its unfolded state, increasing the stability of objects placed on it. For example, when the support 1 is used to support a tabletop, the rectangular structure of the horizontal support 11 provides a flat and sufficient support area, ensuring that the tabletop is not easily tilted or shaken after placement, and ensuring that the overall structure remains stable during use, meeting the user's needs for placing items. The longitudinal support 12 is cylindrical, which makes it easier for users to handle and move the device when it is folded and stored. The cylindrical design is not only ergonomic, but also effectively reduces discomfort during gripping, reduces safety hazards caused by sharp corners, and improves safety. It is especially suitable for occasions that require frequent movement, such as at home or outdoors.

[0044] Furthermore, such as Figure 1 As shown, the longitudinal support 12, at the end furthest from the transverse support 11, is also provided with a laterally extending support leg 121. The extension direction of the support leg 121 is the same as that of the corresponding transverse support 11. The support leg 121 further enhances the stability and load-bearing capacity of the support 1 in its unfolded state, preventing tilting due to uneven force distribution among the transverse supports 11. Furthermore, since the extension direction of the support leg 121 is the same as that of the corresponding transverse support 11, during folding and storage, rotation can be used to ensure that each transverse support 11 and each support leg 121 are parallel to each other, thereby further reducing the overall space occupied, improving the compactness after folding, and facilitating storage and transportation for users.

[0045] Preferably, such as Figure 11As shown, the connection between the transverse support 11 and the longitudinal support 12 is also provided with an "L"-shaped reinforcing rib 14. The reinforcing rib 14 extends along the connection direction of the transverse support 11 and the longitudinal support 12 to enhance the bending resistance of the connection. This not only effectively disperses the influence of external forces on the connection, but also provides additional support force when the support 1 is unfolded, thereby further improving the stability and load-bearing capacity of the overall structure.

[0046] Preferably, both the transverse support 11 and the longitudinal support 12 are hollow structures and are made of high-strength, lightweight aluminum alloy, which ensures the durability of the structure and reduces the overall weight, making them easy to carry and operate.

[0047] The innovation of this invention lies in the use of connectors on the support frame. These connectors are rotatably connected to each other, and the positioning elements enable the support frame to quickly switch between unfolded and folded states. On the one hand, when the support frame is unfolded, the connectors are fixed to form a closed-loop structure, ensuring that the support frame can unfold stably in a radial pattern and has sufficient stability and load-bearing capacity, providing users with a sturdy and flat support platform suitable for various scenarios. On the other hand, when the support frame is folded, each support frame can rotate around the hinge point of the connector and eventually be arranged in parallel, greatly reducing the overall volume and significantly optimizing its space utilization during storage and transportation.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A foldable structure of a scaffold, characterized by, The application relates to a support device, which comprises at least two groups of supports (1), one end of the support (1) is fixedly provided with a connecting piece (2), two adjacent connecting pieces (2) are rotationally connected with each other and form a chain (21), the chain (21) has a head end (211) and a tail end (212), and a positioning piece (3) is commonly connected between the head end (211) and the tail end (212) and used for connecting or disconnecting the head end (211) and the tail end (212). In the unfolded state, the head end (211) and the tail end (212) are connected, the connecting pieces (2) are connected in a head-tail mode, and the connecting line of the center points Q of the connecting pieces (2) forms a closed loop structure, and each support (1) is arranged radially around the axis line P of the closed loop. In the folded state, the head end (211) and the tail end (212) are separated, each support (1) can be folded into a parallel structure through the rotation of the connecting piece (2), and the connecting line of the center points Q of the connecting pieces (2) is located on the same horizontal line.

2. The foldable structure of claim 1, wherein, The support (1) comprises a horizontal support (11) and a vertical support (12) arranged in an L-shaped structure, and the connecting piece (2) is located at the connecting position of the horizontal support (11) and the vertical support (12).

3. The foldable structure of claim 2, wherein, The connecting piece (2) has a first side (22) and a second side (23) which are complementary to each other, the first side (22) is provided with a hinge groove (221), the second side (23) is provided with a hinge block (231) matched with the hinge groove (221), and the hinge block (231) is clamped with the hinge groove (221).

4. The foldable structure of claim 3, wherein, The hinge groove (221) is provided with a first shaft hole (222) on the longitudinal end face, the hinge block (231) is provided with a second shaft hole (232) matched with the first shaft hole (222), and the first shaft hole (222) and the second shaft hole (232) are connected through a hinge shaft (24).

5. The foldable structure of claim 4, wherein, The hinge groove (221) is a cylindrical groove with the first shaft hole (222) as the center, the first side (22) is provided with an arc-shaped protrusion (223) matched with the cylindrical groove, and the second side (23) is provided with an arc-shaped groove (233) matched with the arc-shaped protrusion (223). When the hinge block (231) is clamped with the hinge groove (221) and rotates around the hinge shaft (24), the arc-shaped edge of the arc-shaped groove (233) slides against the arc-shaped edge of the arc-shaped protrusion (223).

6. The foldable structure of claim 5, wherein, The first side (22) comprises a first inner side (224) and a first outer side (225), the arc-shaped protrusion (223) is located between the first inner side (224) and the first outer side (225), the second side (23) comprises a second inner side (234) and a second outer side (235), and the arc-shaped groove (233) is located between the second inner side (234) and the second outer side (235). In the unfolded state, the first inner side (224) of each connecting piece (2) is tightly attached to the second inner side (234) of the adjacent connecting piece (2). The first outer side (225) of each connecting piece (2) is tightly attached to the second outer side (235) of the adjacent connecting piece (2) in the folded state.

7. The foldable structure of claim 4, wherein, The positioning piece (3) is a hinge shaft (24) forming a closed loop.

8. The foldable structure of claim 2, wherein, The connecting piece (2) is provided with a mounting groove (25) matched with the longitudinal support (12), and a side wall of the mounting groove (25) is provided with a notch (251) matched with the transverse support (11), so that the mounting groove (25) wraps the one end of the transverse support (11) and the longitudinal support (12) connected with each other.

9. The foldable structure of claim 8, wherein, The connecting piece (2) is further provided with a positioning hole (26) penetrating through the mounting groove (25), the transverse support (11) and the longitudinal support (12) are respectively provided with a connecting hole (13) corresponding to and communicating with the positioning hole (26), and the positioning hole (26) and the connecting hole (13) are connected and fixed by a locking piece.

10. The foldable structure of claim 2, wherein, The longitudinal support (12) is further provided with a transversely extending supporting leg (121) at the end away from the transverse support (11), and the extending direction of the supporting leg (121) is the same as the extending direction of the corresponding transverse support (11).

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