Folding linkage frame

Abstract

The invention discloses a folding linkage frame which comprises two rod pieces and a linkage frame body, and the two rod pieces rotate around respective end points and at least have a storage state and an unfolding state. The linkage frame is installed on the two rod pieces and at least has a storage state and an unfolding state. And the change of the storage and unfolding states of the two rod pieces follows the change of the storage and unfolding states of the linkage frame. By the adoption of the scheme, the linkage frame can be installed during assembly, and the linkage frame does not need to be independently disassembled and installed during folding and storage every time in the use period.

Description

Technical Field

[0001] This invention belongs to the field of folding furniture or machinery, specifically a folding linkage frame. Background Technology

[0002] Foldable strollers and cribs represent the future trend in the infant and toddler market. The folding mechanism is becoming simpler and more integrated. While this simplification reduces functionality, it also limits the overall design. Adding features requires additional structural elements, which inevitably increases the number of constraint points in the folded state, sometimes preventing the stroller from folding completely. Furthermore, current strollers and cribs often use flat-bottom mechanisms for improved stability, such as four wheels on the ground or a flat support. This eliminates the rocking effect, requiring parents to constantly pick up and rock the child, which is tiring and inconvenient for them.

[0003] For example, the applicant previously submitted CN202522709159.7, which describes a design for a rocking frame for a children's lathe. This design adds a rocking frame to the bottom of the folding children's lathe, but the rocking frame needs to be disassembled when the children's lathe is folded, which is very troublesome to operate.

[0004] Based on this, this application further optimizes the structure of the technology. Summary of the Invention

[0005] The problem solved by this invention is that adding a rocking frame to the bottom of a folding children's stroller causes inconvenience when the stroller needs to be disassembled during folding.

[0006] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention, which adopts the following technical solution:

[0007] A folding linkage frame, comprising:

[0008] Two rods, each rotating about its own end point, have at least two states: retracted and extended.

[0009] A linkage frame, which is mounted on two rods, has at least two states: retracted and extended.

[0010] The changes in the retracted and extended states of the two rods follow the changes in the retracted and extended states of the linkage frame.

[0011] Preferably, the linkage is always mounted on the two linkages during state changes.

[0012] Preferably, the linkage frame includes:

[0013] A linkage rod, comprising a first rod body and a second rod body, with one end of the first rod body and the second rod body connected by a rotational pivot;

[0014] Two kits are installed on the two rods respectively;

[0015] Two connecting parts, one side of which is rotatably mounted on the linkage rod and the other side is rotatably mounted on the kit;

[0016] The first and second rods rotate as the rods rotate.

[0017] Preferably, the kit has a platform hole and a convex corner on the side facing away from the rod;

[0018] The connecting piece has a boss and a corner groove on the side facing away from the linkage rod;

[0019] The platform hole and the boss are installed together, and the convex corner and the corner groove are set together.

[0020] Preferably, a constraint structure is provided between the kit and the rod. The constraint structure includes a column and a slot corresponding to the position of the column. The column rotates circumferentially around the axis of the rod within the slot, and the angle of rotation is limited by the length of the slot.

[0021] The column is located inside the kit, and the slot is located around the periphery of the rod;

[0022] or,

[0023] The column is set on the outer wall of the rod, and the slot is set on the inner side of the kit.

[0024] Preferably, the linkage rod is U-shaped, and the middle part of the linkage rod is arc-shaped.

[0025] Preferably, both ends of the linkage rod are provided with rotation holes;

[0026] The connector is provided with an L-shaped groove and a rotating shaft. The two ends of the linkage rod are accommodated in the corresponding L-shaped groove, and the rotating shaft and the rotating hole are matched.

[0027] Preferably, a limiting protrusion is provided in the L-shaped groove to limit the position of the linkage rod.

[0028] Preferably, both ends of the linkage rod have hollow ends, an elastic element is provided on the inner side of the hollow end, a pin hole is provided on the side of the hollow end, a movable pin is disposed in the pin hole, and the movable pin is connected to the elastic element.

[0029] The L-shaped groove is provided with limit holes and sliding grooves on its side. There are multiple limit holes, all of which are located on the sliding groove. The sliding groove is an arc-shaped structure with the rotating hole as the center and the distance between the rotating hole and the pin hole as the radius. The width of the sliding groove is smaller than the width of the limit hole. The movable pin cooperates with any one of the limit holes to fix the linkage rod after rotation.

[0030] Under the action of external force, the top of the movable pin is squeezed into the pin hole by the sliding groove, compressing the elastic element, and rotates along the sliding groove into another limiting hole.

[0031] Preferably, the rotating hub is provided with a mounting groove and a hub groove, a separator is provided between the mounting groove and the hub groove, a mounting hole is provided on the side of the mounting groove, a connecting shaft one and a second rod body are installed in the mounting hole and connected, and a connecting hole is provided on the side of the hub groove, a connecting shaft two and a first rod body are installed in the connecting hole and connected.

[0032] Preferably, a mating opening is provided on the side of the hub groove away from the first rod, and the mating opening gradually approaches the first rod along the depth direction of the hub groove.

[0033] Preferably, one end of the rod is provided with a first rotation point and the other end is provided with a second rotation point;

[0034] The first rotation point can be set individually, coaxially, or grouped together for rotation;

[0035] The second rotation point is set separately and is used to install moving wheels or support blocks.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The two rods of this invention rotate around their respective endpoints, having at least two states: retracted and extended. The linkage frame is mounted on the two rods, also having at least two states: retracted and extended. The changes in the retracted and extended states of the two rods are synchronized with the changes in the retracted and extended states of the linkage frame. This solution only requires installation during assembly; each folding and retraction during use does not require separate disassembly and reassembly of the linkage frame (swing frame).

[0038] 2. The linkage rod of the present invention is connected by a first rod body and a second rod body via a rotation pivot, which can realize storage and folding. Since the connecting part rotates with the kit, the connecting part and the linkage rod rotate and their rotation surfaces are perpendicular, and the kit can only rotate in the circumferential direction relative to the rod at the installation position, and there is no displacement or very small displacement in the axial direction, when the rod is folded inward, the linkage rod also retracts with the rotation of the rod, thereby realizing the linkage effect. Folding and unfolding actions can be realized without disassembling the swing frame in the prior art.

[0039] 3. When the rocking function of the stroller and crib is required, the present invention pushes two linkage rods to rotate downwards and extend them. With the cooperation of the limiting holes and movable pins at both ends, the position of the linkage rods after downward rotation and adjustment is fixed. Then, the stroller and crib can be pushed to rock on the ground by hand along the direction of the linkage rods, realizing the most basic rocking function of the stroller and crib, which is compatible with the development of the existing stroller and crib field.

[0040] 4. When the rocking function of the stroller and crib is not needed using the two linkage rods, the two linkage rods can be pushed upwards and rotated back to the bottom of the stroller and crib chassis. With the cooperation between the limiting holes and movable pins at both ends of the rocking rod, the position of the linkage rod after rotation adjustment is limited and fixed, so as to limit the position of the linkage rod in the retracted state and prevent the linkage rod from automatically falling down after upward rotation adjustment. Attached Figure Description

[0041] Figure 1 This is a diagram showing the unfolded state of the folding linkage frame of the present invention;

[0042] Figure 2 This is a front view of the unfolded state of the folding linkage frame;

[0043] Figure 3 A side view of the unfolded state of the folding linkage frame;

[0044] Figure 4 This is a structural schematic diagram of the linkage frame;

[0045] Figure 5 , Figure 6 This is a schematic diagram of the kit's structure;

[0046] Figure 7 , Figure 8 This is a structural schematic diagram of the connector;

[0047] Figure 9 This is a schematic diagram of the hollow end structure;

[0048] Figure 10 This is a schematic diagram of the rotating pivot structure;

[0049] Figure 11 To match the location distribution map of the ports;

[0050] Figure 12 This is a structural schematic diagram of the rod;

[0051] Figure 13 A bottom view of the unfolded state of the folding linkage frame;

[0052] Figure 14 This is a structural diagram showing the folded linkage frame in its stored state.

[0053] In the diagram: 10. Linkage rod; 11. First rod body; 12. Second rod body; 13. Rotation pivot; 131. Mounting groove; 132. Pivot groove; 133. Mounting hole; 134. Connecting hole; 135. Mating joint; 14. Hollow end; 15. Rotation hole; 16. Movable pin; 17. Elastic element; 20. Kit; 21. Platform hole; 22. Protruding corner; 23. Column; 30. Connecting part; 31. Boss; 32. L-shaped groove; 321. Limiting hole; 322. Sliding groove; 33. Limiting protrusion; 34. Corner groove; 40. Rod; 41. Groove opening; 42. First rotation point; 43. Second rotation point. Detailed Implementation

[0054] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0055] refer to Figure 1 and Figure 14 A folding linkage frame, comprising:

[0056] Two rods 40, which rotate around their respective ends, have at least two states: retracted and extended.

[0057] The linkage frame is installed on two rods 40 and has at least two states: a retracted state and an extended state. When the linkage frame is in the extended state, it has two states: one is a downward extension state to achieve a rocking function, and the other is an upward retraction state to achieve stability of the stroller and crib.

[0058] The changes in the retracted and extended states of the two rods 40 are synchronized with the changes in the retracted and extended states of the linkage frame.

[0059] For example, the linkage 40 is always mounted on the two linkages 40 during state changes.

[0060] During implementation, the linkage frame is in an upward-folded and retracted state. When retracting the two rods 40, one end of each rod 40 is moved upwards, gradually completing the retraction. The linkage frame retracts synchronously with the retraction of the rods 40 until the retraction is complete. When unfolding the two rods 40, the linkage frame unfolds gradually with the unfolding of the rods 40, gradually completing the unfolding. When a rocking motion is needed, the linkage frame is folded down and extended outwards to raise the wheels or support blocks of the stroller / crib to a certain height, and the stroller / crib can be rocked along the length of the linkage frame. When the rocking function is not needed, the linkage frame is folded up and retracted, and the wheels or support blocks of the stroller / crib contact the ground, achieving a stable state.

[0061] Specifically, such as Figure 4 As shown, the linkage frame includes:

[0062] Linkage rod 10, which includes a first rod body 11 and a second rod body 12, with one end of the first rod body 11 and the second rod body 12 connected by a rotation pivot 13;

[0063] Two kits 20 are respectively installed on two rods 40. The kits 20 and rods 40 are detachable. For example, the kits 20 are provided with an opening. The opening is an outward-curved arc design. The kits 20 are connected to the rods 40 through the opening. The inner diameter of the kits 20 is less than or equal to the outer diameter of the rods 40 to ensure a tight connection between the two and prevent accidental detachment. It also facilitates the installation and disassembly of the two. The coverage area of ​​the kits 20 on the rods 40 is at least half of the circumference of the rods 40, thereby ensuring a tight connection and preventing detachment.

[0064] Two connecting parts 30, one side of the two connecting parts 30 is rotatably mounted on the linkage rod 10 and the other side is rotatably mounted on the kit 20. The rotating surfaces of the connecting parts 30 and the linkage rod 10 are perpendicular to the rotating surfaces of the connecting parts 30 and the kit 20.

[0065] Among them, the first rod 11 and the second rod 12 rotate at the rotation pivot 13 as the rod 40 rotates.

[0066] For example, such as Figure 4 As shown, the linkage 10 is U-shaped, and the middle part of the linkage 10 is arc-shaped, so that the linkage 10 can have a shaking function when it is flipped down and unfolded.

[0067] For example, such as Figure 1 , Figure 13 , Figure 14 As shown, there are four rods 40. One end of each rod 40 is connected to a stabilizing block, and the other end is equipped with a support block or a moving wheel. The four rods 40 are distributed in an X shape. The four rods 40 are arranged in pairs, and each pair is equipped with a linkage frame.

[0068] When swaying is needed, such as Figures 1 to 3 As shown, when the linkage 10 rotates downward to a vertical position or the angle between it and the plane containing the rod 40 is an obtuse angle, the middle arc-shaped position of the linkage 10 contacts the ground. When the linkage 10 is in the swinging working state, the middle position is lower than the bottom of the moving wheels or support blocks on both sides, thus achieving the swinging effect. The stroke difference between the middle position and the moving wheels or support blocks determines the swing amplitude. The larger the stroke difference, the larger the swing amplitude.

[0069] Specifically: such as Figures 5 to 8 As shown, the kit 20 has a platform hole 21 and a convex corner 22 on the side opposite to the rod 40;

[0070] The connecting piece 30 has a boss 31 and a corner groove 34 on the side opposite to the linkage rod 10;

[0071] The platform hole 21 and the boss 31 are installed together, and the protruding corner 22 and the corner groove 34 are set together.

[0072] The boss 31 and the hole 21 facilitate the rotation of the kit 20 and the connector 30. The boss 31 and the hole 21 have holes in their centers, and a pin is installed inside. The pin is used to connect the kit 20 and the connector 30, thereby achieving the connection effect between the two. At the same time, the boss 31 and the hole 21 can also achieve relative rotation. Constraints are required on the rotation surface. When the rod 40 is unfolded, the convex corner 22 and the corner groove 34 cooperate to achieve angular constraint on the connector 30.

[0073] Specifically: such as Figure 5 and Figure 12 As shown, a constraint structure is provided between the kit 20 and the rod 40. The constraint structure includes a column 23 and a slot 41 corresponding to the position of the column 23. The column 23 rotates circumferentially around the axis of the rod 40 within the slot 41, and the angle of rotation is limited by the length of the slot 41. The size of the column 23 is less than or equal to the size of the slot 41. The slot 41 is arranged in the circumferential direction of the rod 40. The column 23 rotates circumferentially relative to the axis of the rod 40 within the slot 41, and does not move or moves very little in the axial direction of the rod 40.

[0074] In one configuration, the column 23 is disposed inside the kit 20, and the slot 41 is disposed around the rod 40.

[0075] In another form, the column 23 is set on the outer wall of the rod 40, and the slot 41 is set on the inner side of the kit 20.

[0076] Both forms can achieve a certain angle of rotation between the kit 20 and the rod 40, thereby achieving the constraint of the kit 20 in the axial direction of the rod 40 and the ability to rotate a certain angle in the circumferential direction. This allows the kit 20 to rotate a certain angle relative to the rod 40 at the installation position without axial displacement or rotation between the kit 20 and the connecting piece 30 when the rod 40 changes between its retracted and unfolded states, or when the linkage rod 10 changes between its folded (or retracted) and unfolded states.

[0077] Specifically: such as Figure 9 As shown, both ends of the linkage rod 10 are provided with rotation holes 15;

[0078] like Figure 8 As shown, the connector 30 is provided with an L-shaped groove 32 and a rotating shaft. The two ends of the linkage rod 10 are accommodated in the corresponding L-shaped groove 32, and the rotating shaft and the rotating hole 15 are compatible.

[0079] The L-shaped groove 32 is provided with a limiting protrusion 33 for limiting the position of the linkage rod 10.

[0080] The L-shaped groove 32 is designed to accommodate the rotation and adjustment of the linkage rod 10 within it. The L-shaped groove 32 is positioned at a certain angle to the axis of the kit 20, ensuring that both ends of the linkage rod 10 can rotate freely within the two connecting parts 30. After the linkage rod 10 rotates upward, it is constrained by the limiting protrusion 33, preventing it from falling off.

[0081] Specifically: such as Figure 9 As shown, an elastic element 17 is provided on the inner side of the hollow end 14, and a pin hole is provided on the side of the hollow end 14. A movable pin 16 is disposed in the pin hole, and the movable pin 16 is connected to the elastic element 17.

[0082] like Figure 8 As shown, the side of the L-shaped groove 32 is provided with a sliding groove 322 and a limiting hole 321. Multiple limiting holes 321 are provided and are all located on the sliding groove 322. The sliding groove 322 is an arc-shaped structure with the rotating hole 15 as the center and the distance between the rotating hole 15 and the pin hole as the radius. The width of the sliding groove 322 is smaller than the width of the limiting hole 321. The movable pin 16 cooperates with any one of the limiting holes 321 to fix the linkage rod 10 after rotation.

[0083] Under the action of external force, the top of the movable pin 16 is pressed into the pin hole by the sliding groove 322, compressing the elastic element 17, and rotates along the sliding groove 322 into another limiting hole 321.

[0084] Figure 9 The elastic element 17 shown is a U-shaped spring sheet, but it can also be an adaptable structure made of elastic elements such as springs. The front end of the movable pin 16 is semi-circular, and the movable pin 16 can also be in various structural forms such as spherical or roller.

[0085] Furthermore, the position of the pin hole is not unique; it only needs to correspond to the position of the sliding groove 322 on the connecting piece 30. The function of the movable pin 16 is to fix the rod body at the rotation angle after rotation, which is simple in structure and effective.

[0086] The movable pin 16 is positioned in the limiting hole 321 under the elastic force of the elastic element 17. Under the action of external force, the arc-shaped top of the movable pin 16 is squeezed and contracted by the sliding groove 322, rotates along the sliding groove 322, and enters another limiting hole 321.

[0087] like Figure 2 and Figure 3As shown, when the linkage rod 10 is rotated upwards to retract, it flips upwards under external force. The arc-shaped top of the movable pin 16 is pressed into the pin hole by the sliding groove 322, compressing the elastic element 17. The movable pin 16 moves along the sliding groove 322 until it reaches the upper limiting hole 321. At this time, the linkage rod 10 is in the retracted state, and the limiting protrusion 33 is used for secondary reinforcement of the position of the linkage rod 10, i.e., a state where the rocking function is not required. When the linkage rod 10 is rotated downwards to unfold, it flips downwards under external force. The arc-shaped top of the movable pin 16 is pressed into the pin hole by the sliding groove 322, compressing the elastic element 17. The movable pin 16 moves along the sliding groove 322 until it reaches the lower limiting hole 321. At this time, the linkage rod 10 is in a vertical state or the angle between it and the plane containing the rod 40 is an obtuse angle. At this time, the middle position of the linkage rod 10 supports the entire stroller / crib. By rocking along the length of the linkage rod 10, the function of a rocking bed is achieved.

[0088] Specifically: such as Figure 10 and Figure 11 As shown, the rotating hub 13 is provided with a mounting groove 131 and a hub groove 132. A separator is provided between the mounting groove 131 and the hub groove 132. A mounting hole 133 is provided on the side of the mounting groove 131. A connecting shaft 1 and a second rod 12 are installed in the mounting hole 133 and connected together. A connecting hole 134 is provided on the side of the hub groove 132. A connecting shaft 2 and a first rod 11 are installed in the connecting hole 134 and connected together.

[0089] The pivot groove 132 has a mating opening 135 on the side away from the first rod 11. The mating opening 135 gradually approaches the first rod 11 along the depth direction of the pivot groove 132.

[0090] The first rod 11 and the second rod 12 are connected by a rotating pivot 13. When the two are folded, the first rod 11 rotates around the connecting shaft until the side of the first rod 11 and the mating port 135 are matched. When unfolded, the end of the first rod 11 contacts the separator and / or the side of the first rod 11 contacts the pivot groove 132. When the linkage rod 10 unfolds downward to realize the shaking function, the groove opening of the mounting groove 131 faces downward and the position of the mating port 135 faces upward.

[0091] Specifically: such as Figure 12 As shown, one end of the rod 40 is provided with a first rotation point 42 and the other end is provided with a second rotation point 43;

[0092] The first rotation point 42 can be set individually, coaxially, or grouped together for rotation, such as... Figure 1 The first rotation point 42 of the multiple rods 40 shown is concentrated on a stabilizing block;

[0093] The second rotation point 43 is set separately and is used to install moving wheels or support blocks to provide support.

[0094] The kit 20 has a fifth rotation point on the rod 40. The fifth rotation point rotates upward around the axis of the rod 40 at an angle. It is generally located in the lower middle position of the rod 40, that is, close to the second rotation point 43.

[0095] A third turning point is formed between the connector 30 and the kit 20, which releases the rotation during the folding process. Without this point, the position would be restricted and the folding process would not be completed.

[0096] The first rod 11 and the second rod 12 form a fourth rotation point at the rotation hub 13. The fourth rotation point is the folding and retraction of the two rods. Depending on the structural design, their rotation axis does not necessarily need to be perpendicular to the axis of the rod 40.

[0097] A sixth rotation point is formed between the rod and the connecting member 30. This is the rotation point of the linkage rod 10 in its unfolded state. The linkage rod 10 rotates downward to support and lift the bottom of the rod 40, at which point the bed can be rocked to achieve the purpose of rocking the bed. If a non-roller structure is provided at the bottom of the rod 40, a tubular wheel or similar structure can also be installed at the bottom of the linkage rod 10. This structure can be rotated up and down at a certain angle relative to the linkage rod 10, so that the structure contacts the ground to support the entire structure, and the movement of the entire stroller and crib does not produce much noise; or it can be lifted off the ground so that the linkage rod 10 directly contacts the ground to achieve the purpose of rocking the bed.

[0098] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A folding linkage frame, characterized in that, include: Two rods (40) rotate around their respective ends and have at least two states: retracted and unfolded. The linkage frame is installed on two rods (40) and has at least two states: storage and unfolding. The changes in the retracted and unfolded states of the two rods (40) are synchronized with the changes in the retracted and unfolded states of the linkage frame.

2. A folding linkage frame according to claim 1, characterized in that, The linkage (40) and the linkage frame are always mounted on the two linkages (40) during the state change.

3. A folding linkage frame according to claim 1, characterized in that, The linkage frame includes: Linkage rod (10), the linkage rod (10) includes a first rod body (11) and a second rod body (12), one end of the first rod body (11) and the second rod body (12) are connected by a rotation pivot (13); Two kits (20) are respectively installed on two rods (40); Two connectors (30), one side of the two connectors (30) is rotatably mounted on the linkage rod (10), and the other side is rotatably mounted on the kit (20); The first rod (11) and the second rod (12) rotate with the rotation of the rod (40).

4. A folding linkage frame according to claim 3, characterized in that, The kit (20) has a platform hole (21) and a convex corner (22) on the side opposite to the rod (40). The connector (30) has a boss (31) and a corner groove (34) on the side opposite to the linkage rod (10). The platform hole (21) and the boss (31) are installed together, and the convex corner (22) and the corner groove (34) are set together.

5. A folding linkage frame according to claim 3, characterized in that, A constraint structure is provided between the kit (20) and the rod (40). The constraint structure includes a column (23) and a slot (41) corresponding to the position of the column (23). The column (23) rotates circumferentially around the axis of the rod (40) within the slot (41). The angle of rotation is limited by the length of the slot (41). The column (23) is located inside the kit (20), and the slot (41) is located around the rod (40); Alternatively, the column (23) is set on the outer wall of the rod (40), and the slot (41) is set on the inner side of the kit (20).

6. A folding linkage frame according to claim 3, characterized in that, The linkage rod (10) is U-shaped, and the middle part of the linkage rod (10) is arc-shaped.

7. A folding linkage frame according to claim 3, characterized in that, Both ends of the linkage rod (10) are provided with rotating holes (15). The connector (30) is provided with an L-shaped groove (32) and a rotating shaft. The two ends of the linkage rod (10) are accommodated in the corresponding L-shaped groove (32), and the rotating shaft and the rotating hole (15) are compatible.

8. A folding linkage frame according to claim 7, characterized in that, The L-shaped groove (32) is provided with a limiting protrusion (33) for limiting the position of the linkage rod (10).

9. A folding linkage frame according to claim 3, characterized in that, Both ends of the linkage rod (10) have hollow ends (14), and an elastic element (17) is provided on the inner side of the hollow end (14). A pin hole is provided on the side of the hollow end (14), and a movable pin (16) is arranged in the pin hole. The movable pin (16) is connected to the elastic element (17). The L-shaped groove (32) is provided with a limiting hole (321) and a sliding groove (322) on its side. There are multiple limiting holes (321) and they are all located on the sliding groove (322). The sliding groove (322) is an arc-shaped structure with the rotating hole (15) as the center and the distance between the rotating hole (15) and the pin hole as the radius. The width of the sliding groove (322) is smaller than the width of the limiting hole (321). The movable pin (16) cooperates with any one of the limiting holes (321) to fix the linkage rod (10) after rotation. Under the action of external force, the top of the movable pin (16) is squeezed into the pin hole by the sliding groove (322) to compress the elastic element (17), and rotates along the sliding groove (322) into another limiting hole (321).

10. A folding linkage frame according to claim 3, characterized in that, The rotating hub (13) is provided with an installation groove (131) and a hub groove (132). A separator is provided between the installation groove (131) and the hub groove (132). An installation hole (133) is provided on the side of the installation groove (131). A connecting shaft one and a second rod body (12) are installed in the installation hole (133). A connecting hole (134) is provided on the side of the hub groove (132). A connecting shaft two and a first rod body (11) are installed in the connecting hole (134).

11. A folding linkage frame according to claim 10, characterized in that, The pivot groove (132) has a mating opening (135) on the side away from the first rod (11), and the mating opening (135) gradually approaches the first rod (11) along the depth direction of the pivot groove (132).

12. A folding linkage frame according to claim 3, characterized in that, The rod (40) has a first rotation point (42) at one end and a second rotation point (43) at the other end. The first rotation point (42) can be set separately, coaxially, or grouped together for rotation; The second rotation point (43) is set separately for installing moving wheels or support blocks.

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