A support structure and a folding bed frame using the support structure

Abstract

The present application relates to the field of home furnishing technology, and provides a support structure and a folding bed frame using the support structure. The support structure includes a support foot, a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the support foot, the other end of the first connecting rod is hinged to the second connecting rod, and a limiting portion is provided on the second connecting rod. When the first connecting rod and the second connecting rod rotate to the direction in which the angle increases and are located in the same straight line, one side of the end of the first connecting rod abuts against the limiting portion; the second connecting rod slides and is sleeved with a positioning sleeve, and a stopper is fixed on the inner wall of the positioning sleeve. When the positioning sleeve slides downward and is sleeved on the hinged end of the first connecting rod and the second connecting rod, the first connecting rod and the second connecting rod are restricted to be in the same straight line and relatively stationary. At this time, the stopper abuts against the end of the first connecting rod and restricts the positioning sleeve from continuing to slide completely downward to the first connecting rod. Based on this, the effect of facilitating the storage or deployment of the support foot can be achieved.

Description

Technical Field

[0001] The present application relates to the field of home furnishings, and in particular to a supporting structure and a folding bed frame using the supporting structure. Background Art

[0002] A bed is a common piece of furniture used for resting. It typically consists of a bed frame and a mattress, with the mattress resting on the frame's support surface. In recent years, foldable bed frames have seen rapid growth. Because they can be folded for storage and transport, they significantly save space and are therefore more convenient to transport and carry.

[0003] In the prior art, a Chinese patent with the announcement number CN207886004U discloses a support structure for a folding bed support leg, comprising a connecting tube hinged to a bed frame, a slot provided in the connecting tube, and an insert hinged to the support leg, the insert cooperating with the slot; a locking member with a groove is provided on the outer periphery of the connecting tube, a spring is provided between the locking member at the bottom of the groove and the connecting tube, a bayonet is provided on the locking member at the opening of the groove, an opening cooperating with the bayonet is provided on the connecting tube, the opening communicates with the slot inside the connecting tube and the outside, and a locking groove cooperating with the opening and the bayonet is provided on the insert.

[0004] Regarding the above-mentioned related technologies, the support structure mostly includes a connecting tube, an insert and a support leg. One end of the support member is hinged to the bed frame, and the other end is in contact with the placement surface. One end of the connecting tube is also hinged to the bed frame, and the other end is indirectly hinged to the support leg through the insert. One end of the insert is hinged to the support leg, and the other end is engaged with the connecting tube. However, when the support leg needs to be folded and stored, it is necessary to press the insert continuously to compress the spring until the latch releases the engagement with the opening and the engaging groove, and then pull the insert out of the slot to achieve the folding of the support leg. When the support leg needs to be opened, the insert must be inserted into the connecting tube again and the insert must continue to be pressed, which makes it more cumbersome to store or unfold the support leg, and therefore needs to be improved. Summary of the Invention

[0005] In order to facilitate the storage or deployment of support legs, the present application provides a support structure and a folding bed frame using the support structure.

[0006] In the first aspect, the present application provides a support structure that adopts the following technical solution:

[0007] A supporting structure includes a supporting foot, a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the supporting foot, the other end of the first connecting rod is hinged to the second connecting rod, and a limiting portion is provided on the second connecting rod. When the first connecting rod and the second connecting rod rotate to the direction in which the angle becomes larger and are located in the same straight line, one side of the end of the first connecting rod abuts against the limiting portion. At this time, the limiting portion limits the first connecting rod and the second connecting rod from continuing to rotate in that direction; a positioning sleeve is slid and sleeved on the second connecting rod, and a stopper is fixed on the inner wall of the positioning sleeve. When the positioning sleeve slides downward and sleeves on the hinged ends of the first connecting rod and the second connecting rod, the first connecting rod and the second connecting rod are restricted to being in the same straight line and relatively stationary. At this time, the stopper abuts against the end of the first connecting rod and limits the positioning sleeve from continuing to slide downward completely to the first connecting rod.

[0008] By adopting the above technical solution, when the supporting foot needs to be opened for deployment and use, the supporting foot can be rotated so that the first connecting rod and the second connecting rod are located in the same straight line. At this time, the limit part can limit the first connecting rod and the second connecting rod from continuing to rotate in the rotation direction; then, it is only necessary to slide the positioning sleeve downward until the stop block abuts against the end of the first connecting rod to limit the positioning sleeve from continuing to slide downward. At this time, the positioning sleeve is arranged on the outside of the mutual hinge of the first connecting rod and the second connecting rod, thereby making it impossible for the first connecting rod and the second connecting rod to rotate in another direction. Therefore, the first connecting rod and the second connecting rod are restricted to the same straight line, which is convenient and quick; when the supporting foot needs to be stored, it is only necessary to slide the positioning sleeve upward from the hinged end of the first connecting rod and the second connecting rod to cancel the restriction on the rotation of the first connecting rod and the second connecting rod in one direction, and then the supporting foot can be stored, thereby achieving the effect of facilitating the storage or deployment of the supporting foot.

[0009] Preferably, the second connecting rod is a tubular structure with an internal cavity, and the side wall of the second connecting rod is provided with a strip hole connected to the internal cavity along its own length direction. There is a gap between the two sides of the stop block and the opposite sides of the positioning sleeve. The stop block is arranged opposite to the strip hole and slides in the strip hole, and one end of the first connecting rod is located in the cavity of one end of the second connecting rod.

[0010] By adopting the above technical solution, one end of the first connecting rod can be inserted into the hole cavity, and a strip hole is provided so that when the positioning sleeve is mounted on the outside of the second connecting rod, the block can slide along the strip hole in the cavity, ensuring that the positioning sleeve can be stably mounted and slidably connected in the length direction of the second connecting rod; and the strip hole can provide avoidance space for the rotation of the first connecting rod, ensuring that the first connecting rod can rotate normally.

[0011] Preferably, the first connecting rod and the second connecting rod are hinged by a first rotating shaft, the first rotating shaft passes through the cavity of the second connecting rod and the first connecting rod, and the second connecting rod is close to the first connecting rod and is provided with a clearance hole at the outer position covering the first connecting rod, and the clearance hole is arranged opposite to the bar hole; when the first connecting rod rotates, one end of the first connecting rod enters the clearance hole, and when the first connecting rod is in the same straight line with the second connecting rod, the first connecting rod leaves the clearance hole.

[0012] By adopting the above technical solution, since one end of the first connecting rod is located in the cavity, when the first connecting rod rotates, the end of the first connecting rod can enter the clearance hole, providing clearance for the rotation of the first connecting rod, so that the side wall of the first connecting rod can rotate normally when it is in contact with the inner wall of the cavity of the second connecting rod.

[0013] Preferably, the limiting portion is a portion of the second connecting rod where the clearance hole faces the other end of the first connecting rod.

[0014] By adopting the above technical solution, since one end of the first connecting rod is located in the cavity of the second connecting rod, when the first connecting rod rotates to be in the same straight line with the second connecting rod, the part of the second connecting rod located in the clearance hole facing the other end of the first connecting rod will fit into the side wall of the first connecting rod, thereby achieving the effect of limiting the continued rotation of the first connecting rod.

[0015] Preferably, the first rotating shaft is a rivet, and the two ends of the rivet are locked to the opposite sides of the second connecting rod. Slide grooves are provided on the opposite sides of the inner wall of the positioning sleeve. The slide grooves are located on the opposite sides of the stop block. The slide grooves are provided along the length direction of the second connecting rod, and the two ends of the rivet are slidably connected to the slide grooves.

[0016] By adopting the above technical solution, a rotational connection between the first connecting rod and the second connecting rod can be achieved through rivets, and after the rivets are riveted, both ends will protrude from the outside of the second connecting rod. Through the sliding groove, it is ensured that the positioning sleeve can be sleeved and slid on the part of the second connecting rod with the rivet, and the inner wall of the positioning sleeve can fit and be stably sleeved on the second connecting rod.

[0017] Preferably, a reinforcing rib is fixed to the inner wall of the positioning sleeve on a side of the stopper away from the first connecting rod.

[0018] By adopting the above technical solution, when the positioning sleeve slides downward until the block abuts the end of the first connecting rod, the block will be impacted and easily damaged; and the reinforcing ribs can increase the connection strength between the block and the inner wall of the positioning sleeve, reducing the possibility of damage to the block.

[0019] Preferably, the supporting foot includes two vertical rods and a horizontal rod fixed between the two vertical rods, a hinge seat is provided on the horizontal rod, and an end of the first connecting rod away from the second connecting rod is hinged to the hinge seat.

[0020] By adopting the above technical solution, the lower ends of the two vertical rods are in contact with the placement surface, and the first connecting rod is hinged on the hinge seat of the horizontal rod.

[0021] Preferably, the first connecting rod is tubular, and the end of the first connecting rod is hinged to the hinge seat by a bolt and a nut. The bolt passes through the hinge seat and is locked to the hinge seat by a nut. The end of the first connecting rod is provided with a through hole for the bolt to pass through. A protective cover is inserted and clamped at the position of the through hole on the first connecting rod, and the protective cover is provided on the stud position of the bolt.

[0022] By adopting the above technical solution, the first connecting rod is tubular, which avoids the first connecting rod from being too heavy; after the bolt passes through the hinge seat and is locked with the nut, the first connecting rod can be rotatably connected to the hinge seat, and rotated along the stud of the bolt, which facilitates the disassembly between the first connecting rod and the supporting foot; since the bolt will rub against the perforated side wall, when the supporting foot is unfolded or retracted, the protective cover can prevent the rotating first connecting rod from directly contacting the outer side of the stud of the bolt, and the force between the bolt and the first connecting rod is more uniform, making the rotation of the first connecting rod more stable.

[0023] Preferably, the protective sleeve includes a sleeve and a ring piece fixed at one end of the sleeve, the area of ​​the ring piece is larger than the area of ​​the perforation, a clamping block is fixed on the outside of the sleeve, and an inclined guide surface is provided on the side of the clamping block away from the ring piece, and the inclined guide surface is inclined in a direction away from the outside of the sleeve and close to the ring piece.

[0024] By adopting the above technical solution, during installation, the sleeve is passed through the perforation, and the clamping block can enter the first connecting rod along the side wall of the perforation. At this time, the ring piece fits tightly on the outside of the first connecting rod, and the stud of the bolt passes through the sleeve, which can reduce the possibility of deformation of the first connecting rod.

[0025] In the second aspect, the present application provides a folding bed frame adopting the following technical solution:

[0026] A folding bed frame includes the above-mentioned support mechanism, and the folding bed frame also includes a folding bed frame, the folding bed frame includes a middle leg and two side frames hinged at the upper end of the middle leg, the two side frames are located in the same plane and the rotation axes are parallel to each other, the support mechanism is provided with two and is located at one end of the two side frames away from each other, the support leg and one end of the second connecting rod are hinged to the side frame; when the folding bed frame is unfolded, the two side frames are in the same plane; when the folding bed frame is folded, the two side frames are parallel to each other.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] (1) By arranging the coordination among the support leg, the first connecting rod, the second connecting rod, the limiting portion, the positioning sleeve and the stopper, the rotational relationship between the first connecting rod and the second connecting rod can be controlled by simply sliding the positioning sleeve, thereby achieving the effect of facilitating the storage or deployment of the support leg;

[0029] (2) By setting the sliding groove, it is possible to provide space for the two ends of the rivet, ensuring the stable sliding of the positioning sleeve on the outside of the second connecting rod;

[0030] (3) By providing a protective cover, the connection stability between the first connecting rod and the supporting leg can be improved, the deformation of the first connecting rod at the portion where the bolt passes through can be reduced, and the stability of the first connecting rod can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of the support structure of this embodiment when it is unfolded;

[0032] Figure 2 This is a schematic structural diagram of the support structure of this embodiment when it is unfolded from another perspective;

[0033] Figure 3 is a schematic structural diagram of the support structure of this embodiment when it is stored;

[0034] Figure 4 1 is a schematic structural diagram of the positioning sleeve of this embodiment;

[0035] Figure 5 Schematic diagram of the explosion structure of this embodiment;

[0036] Figure 6 yes Figure 5 Enlarged view of part A in the middle;

[0037] Figure 7 This is a schematic structural diagram of the folding bed frame of this embodiment when it is unfolded;

[0038] Figure 8 It is a structural diagram of the foldable bed frame of this embodiment when it is stored.

[0039] Figure numerals: 1, supporting leg; 101, vertical rod; 102, horizontal rod; 2, first connecting rod; 3, second connecting rod; 4, hinged seat; 5, limiting part; 6, strip hole; 7, first rotating shaft; 8, clearance hole; 9, positioning sleeve; 10, stop block; 11, reinforcing rib; 12, slide groove; 13, protective cover; 131, sleeve; 132, ring plate; 14, clamping block; 15, folding bed frame; 151, middle leg; 152, side frame; 16, bolt. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-8 This application is described in further detail.

[0041] The embodiment of the present application discloses a support structure. Figure 1 The support structure includes a support leg 1, a first connecting rod 2, and a second connecting rod 3. This embodiment is described with the support structure deployed for use. The support leg 1 includes two vertical rods 101 and a horizontal rod 102 fixed between the two vertical rods 101. The two vertical rods 101 are arranged vertically and parallel, and the ends of the horizontal rod 102 are fixed to the vertical rods 101 near the middle. Articulated seats 4 are fixed near the ends of the horizontal rod 102. One end of the first connecting rod 2 is rotatably connected to the articulated seat 4, and the other end is hinged to the second connecting rod 3.

[0042] A limiting portion 5 is integrally fixed on the second connecting rod 3. When the first connecting rod 2 and the second connecting rod 3 rotate to the direction in which the angle becomes larger and are located in the same straight line, one side of the end of the first connecting rod abuts against the limiting portion 5. At this time, the limiting portion 5 can limit the first connecting rod 2 and the second connecting rod 3 from continuing to rotate in this direction, so that the first connecting rod 2 and the second connecting rod 3 cannot continue to rotate in this direction when they rotate to the same straight line; and at this time, the supporting leg 1 is in an unfolded and used state.

[0043] Reference Figure 1 and Figure 2 Both the first and second connecting rods 2 and 3 are tubular structures with rectangular cross-sections. They are hollow, reducing the weight of the support structure. A strip-shaped hole 6 is defined along one side of the second connecting rod 3, extending along its length. One end of the first connecting rod 2 is inserted into the hollow end of the second connecting rod 3. The cross-sectional area of ​​the first connecting rod 2 is slightly smaller than that of the second connecting rod 3, ensuring that the end of the first connecting rod 2 can be properly inserted into the second connecting rod 3.

[0044] Reference Figure 1 and Figure 3 The first link 2 and the second link 3 are hingedly connected by a first rotating shaft 7. The clearance hole 8 provides clearance for the rotation of the first link 2. When the first link 2 rotates, it can rotate into the cavity of the second link 3 and approach a position close to the second link 3, at which time the support leg 1 is in the retracted position. In this embodiment, the first rotating shaft 7 is selected as a rivet, with both ends of the rivet locked to opposite sides of the second link 3. The first rotating shaft 7 passes through both the second link 3 and the first link 2. The second link 3 is provided with a clearance hole 8 near the outside of the first link 2 and covering the first link 2. The clearance hole 8 is arranged opposite the strip hole 6. Because the first and second links 2 and 3 are in a straight line, one side of the first link 2 is aligned with the inner wall of the second link 3 with the clearance hole 8. Two sides of the first link 2 are also opposite two sides of the second link 3. The rear side of the first link 2 is opposite the clearance hole 8. Therefore, the first link 2 can only rotate along the side with the clearance hole 8. Moreover, when the first connecting rod 2 rotates, one end of the first connecting rod 2 enters the clearance hole 8. When the first connecting rod 2 is in the same straight line or close to the second connecting rod 3, the end of the first connecting rod 2 rotates one circle and then leaves the clearance hole 8, ensuring the normal rotation of the first connecting rod 2.

[0045] Among them, when the first connecting rod 2 and the second connecting rod 3 are in the same straight line state, the limiting portion 5 is the portion of the second connecting rod 3 located at the clearance hole 8 facing the other end of the first connecting rod 2; by opening the clearance hole 8 on the second connecting rod 3, the limiting portion 5 can be formed at the portion of the second connecting rod 3 close to the rotation with the first connecting rod 2.

[0046] Reference Figure 1 and Figure 4In order to rotate the first connecting rod 2 and the second connecting rod 3 in the same straight line state in the other direction, so that the first connecting rod 2 and the second connecting rod 3 are stable in the same straight line state, thereby ensuring the stability of the support structure when in use. A positioning sleeve 9 is slidably mounted on the second connecting rod 3 and sleeved thereon. The cross-section of the positioning sleeve 9 is rectangular and mutually adapted with the outer side of the second connecting rod 3. A stopper 10 is fixed to the inner wall of the positioning sleeve 9 and away from the first connecting rod 2. There is a gap between the horizontal sides of the stopper 10 and the opposite inner side walls of the positioning sleeve 9. The opposite sides of the first connecting rod 2 pass through the gap. The stopper 10 is arranged opposite to the strip hole 6 and slides inside the strip hole 6. One end of the first connecting rod 2 is located in the cavity at one end of the second connecting rod 3.

[0047] When the positioning sleeve 9 slides downward and is placed on the hinged ends of the first link 2 and the second link 3, the stopper 10 abuts the end of the first link 2 and limits the positioning sleeve 9 from sliding further downward to completely slide onto the first link 2. At this time, the positioning sleeve 9 covers the portion of the strip hole 6 near the hinged end where the first link 2 is inserted into the second link 3, so that the first link 2 and the second link 3 cannot continue to rotate, and the first link 2 and the second link 3 are fixed in the same straight line, which makes positioning convenient and quick; and after the positioning sleeve 9 slides upward away from the portion where the first link 2 is inserted into the second link 3, the portion of the strip hole 6 opposite to the first link 2 in the cavity of the second link 3 is opened, and the first link 2 and the second link 3 can continue to rotate, so that the support leg 1 is stored. A reinforcing rib 11 is integrally fixed to the inner wall of the positioning sleeve 9 on the side of the stop block 10 away from the first connecting rod 2. Since the stop block 10 will abut against the end of the first connecting rod 2 when the positioning sleeve 9 is required to move downward, the stop block 10 will be impacted. The reinforcing rib 11 can improve the connection stability between the stop block 10 and the positioning sleeve 9.

[0048] Among them, reference Figure 4 and Figure 5 , sliding grooves 12 are provided on the opposite sides of the inner wall of the positioning sleeve 9, and the sliding grooves 12 are located on the horizontal sides of the stop block 10. The sliding grooves 12 are arranged along the length direction of the second connecting rod 3, and the two ends of the rivet are slidably connected to the sliding grooves 12; because the two ends of the rivet will protrude from the horizontal sides of the second connecting rod 3, and the sliding grooves 12 can provide avoidance space for the two ends of the rivet, so that the positioning sleeve 9 can slide normally on the second connecting rod 3, and at the same time ensure that the positioning sleeve 9 can better fit the outer wall of the second connecting rod 3, ensuring the stability of the first connecting rod 2 and the second connecting rod 3 when they are limited to the same straight line.

[0049] Further, refer to Figure 5 and Figure 6The hinge seat 4 is a U-shaped piece with an opening facing upward and welded to the cross bar 102. One end of the first connecting rod 2 is located in the opening of the U-shaped piece. The end of the first connecting rod 2 is hinged to the hinge seat 4 by a bolt 16 and a nut. The bolt 16 passes through the hinge seat 4 and is locked to the hinge seat 4 by a nut; the end of the first connecting rod 2 is provided with a through hole for the bolt 16 to pass through. A protective cover 13 is inserted and clamped at the position of the through hole on the first connecting rod 2. The protective cover 13 is sleeved on the stud part of the bolt 16. The protective cover 13 can prevent the bolt 16 from directly being squeezed and stressed by the first connecting rod 2 and the through hole, thereby reducing deformation of the first connecting rod 2 and wear on the stud part.

[0050] Specifically, the protective sleeve 13 can be made of a plastic material with a certain degree of deformability. The protective sleeve 13 includes a circular sleeve 131 and a ring piece 132 fixed to one end of the sleeve 131. The area of ​​the ring piece 132 is larger than the area of ​​the perforation. A rectangular block 14 is fixed to the outside of the sleeve 131 and is spaced apart along the same side of the sleeve 131. The block 14 is provided with an inclined guide surface on the side away from the ring piece 132, which is inclined in a direction away from the outside of the sleeve 131 and toward the ring piece 132. Each perforation corresponds to a protective sleeve 13. When the sleeve 131 is inserted into a perforation, the block 14 slides from the outside of the first connecting rod 2 into the inside of the first connecting rod 2 along the inclined guide surface and is locked in the first connecting rod 2. At this time, the ring piece 132 is attached to the outside of the first connecting rod 2, reducing the possibility of deformation of the first connecting rod 2 and ensuring more uniform force on the first connecting rod 2 and the stud.

[0051] The implementation principle of a support structure in an embodiment of the present application is: when the supporting foot 1 needs to be stored, the positioning sleeve 9 is slid upward until the strip hole 6 and the relative part of the first connecting rod 2 in the cavity of the second connecting rod 3 are opened, and the first connecting rod 2 can be rotated to a position close to the second connecting rod 3. At this time, the angle between the first connecting rod 2 and the second connecting rod 3 gradually turns to the minimum position, and the supporting foot 1 can be stored.

[0052] When the supporting foot 1 is to be deployed for use, the first connecting rod 2 is rotated to a position where it is in a straight line with the second connecting rod 3. At this time, the limit portion 5 can limit the first connecting rod 2 from continuing to rotate in that direction to a position where the angle exceeds 180 degrees. Then, the positioning sleeve 9 is slid downward until the stopper 10 abuts against the end of the first connecting rod 2, preventing the positioning sleeve 9 from sliding further downward. At this time, the positioning sleeve 9 covers the strip hole 6 near the hinged end where the first connecting rod 2 is inserted into the second connecting rod 3. Therefore, the positioning sleeve 9 can limit the rotation of the first connecting rod 2 in the other direction, achieving the effect of facilitating the storage or deployment of the supporting foot 1.

[0053] The present application also discloses a folding bed frame. Figure 7 and Figure 8The folding bed frame includes a folding bed frame 15 and the above-mentioned supporting mechanism. The folding bed frame 15 includes a middle leg 151 and two side frames 152 hinged at the upper end of the middle leg 151. The two side frames 152 are located in the same plane and the rotation axes are parallel to each other; the supporting mechanism is provided with two and is located at the lower side of the end of the two side frames 152 away from each other, and the upper end of the supporting leg 1 and the end of the second connecting rod 3 away from the first connecting rod 2 are hinged to the side frame 152.

[0054] The implementation principle of a folding bed frame in an embodiment of the present application is: when the folding bed frame is unfolded, the two side frames 152 are in the same plane, and the first connecting rod 2 and the second connecting rod 3 are in the same straight line; when the folding bed frame is folded, the two side frames 152 are rotated downward and retracted to a position that is almost parallel to each other. At this time, the first connecting rod 2 is rotated to a position that is close to being in contact with the second connecting rod 3, thereby realizing the storage of the folding bed frame.

[0055] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A support structure, characterized in that: The invention comprises a supporting foot (1), a first connecting rod (2) and a second connecting rod (3), wherein one end of the first connecting rod (2) is hinged to the supporting foot (1), the other end of the first connecting rod (2) is hinged to the second connecting rod (3), and a limiting portion (5) is provided on the second connecting rod (3). When the first connecting rod (2) and the second connecting rod (3) rotate to a direction in which the included angle increases and they are located on the same straight line, one side of the end of the first connecting rod (2) abuts against the limiting portion (5), and at this time, the limiting portion (5) limits the first connecting rod (2) and the second connecting rod (3) from continuing to rotate in this direction. A positioning sleeve (9) slides on the second connecting rod (3) and is sleeved thereon, a stopper (10) is fixed to the inner wall of the positioning sleeve (9), when the positioning sleeve (9) slides downward and is sleeved on the hinged ends of the first connecting rod (2) and the second connecting rod (3), the first connecting rod (2) and the second connecting rod (3) are restricted to be in the same straight line and relatively still, at which time the stopper (10) abuts against the end of the first connecting rod (2) and restricts the positioning sleeve (9) from continuing to slide completely downward onto the first connecting rod (2); The second connecting rod (3) is a tubular structure with an internal cavity. The side wall of the second connecting rod (3) is provided with a strip hole (6) along its length direction and connected to the internal cavity. There is a gap between the two sides of the stopper (10) and the opposite sides of the positioning sleeve (9). The stopper (10) is arranged opposite to the strip hole (6) and slides in the strip hole (6). One end of the first connecting rod (2) is located in the cavity at one end of the second connecting rod (3). The first connecting rod (2) and the second connecting rod (3) are hingedly connected via a first rotating shaft (7), the first rotating shaft (7) passing through a cavity of the second connecting rod (3) and the first connecting rod (2), a clearance hole (8) is provided at an outer position of the second connecting rod (3) close to the first connecting rod (2) and covering the first connecting rod (2), the clearance hole (8) being arranged opposite to the strip hole (6); when the first connecting rod (2) rotates, one end of the first connecting rod (2) enters the clearance hole (8), and when the first connecting rod (2) is in the same straight line as the second connecting rod (3), the first connecting rod (2) leaves the clearance hole (8); The first rotating shaft (7) is a rivet, and the two ends of the rivet are locked to the opposite sides of the second connecting rod (3). The opposite sides of the inner wall of the positioning sleeve (9) are provided with sliding grooves (12). The sliding grooves (12) are located on the opposite sides of the stopper (10). The sliding grooves (12) are arranged along the length direction of the second connecting rod (3). The two ends of the rivet are slidably connected to the sliding grooves (12). The supporting foot (1) comprises two vertical rods (101) and a horizontal rod (102) fixed between the two vertical rods (101); a hinge seat (4) is provided on the horizontal rod (102); and one end of the first connecting rod (2) away from the second connecting rod (3) is hinged to the hinge seat (4); The first connecting rod (2) is tubular, and the end of the first connecting rod (2) is hinged to the hinge seat (4) by means of a bolt (16) and a nut. The bolt (16) passes through the hinge seat (4) and is locked to the hinge seat (4) by means of a nut. A through hole for the bolt (16) to pass through is provided at the end of the first connecting rod (2). A protective sleeve (13) is inserted and clamped at the position of the through hole on the first connecting rod (2), and the protective sleeve (13) is sleeved on the stud portion of the bolt (16).

2. A support structure according to claim 1, characterized in that: The limiting portion (5) is a portion of the second connecting rod (3) located at the other end of the clearance hole (8) facing the first connecting rod (2).

3. A support structure according to claim 1, characterized in that: A reinforcing rib (11) is fixed to the inner wall of the positioning sleeve (9) on a side of the stopper (10) away from the first connecting rod (2).

4. A support structure according to claim 3, characterized in that: The protective sleeve (13) comprises a sleeve (131) and a ring sheet (132) fixed to one end of the sleeve (131); the area of ​​the ring sheet (132) is larger than the area of ​​the perforation; a clamping block (14) is fixed to the outside of the sleeve (131); an inclined guide surface is provided on a side of the clamping block (14) away from the ring sheet (132); the inclined guide surface is inclined in a direction away from the outside of the sleeve (131) and close to the ring sheet (132).

5. A folding bed frame, characterized in that: The folding bed frame comprises a support structure as claimed in any one of claims 1 to 4, wherein the folding bed frame also comprises a folding bed frame (15), the folding bed frame (15) comprises a middle leg (151) and two side frames (152) hinged at the upper end of the middle leg (151), the two side frames (152) are located in the same plane and the rotation axes are parallel to each other, the support structure is provided with two ends which are located away from each other from the two side frames (152), and one end of the support leg (1) and the second connecting rod (3) are hinged to the side frame (152); when the folding bed frame is unfolded, the two side frames (152) are in the same plane; when the folding bed frame is folded, the two side frames (152) are parallel to each other.

Images