Supporting assembly

Abstract

The invention discloses a supporting assembly which comprises a supporting cross rod and connecting seats arranged at the two ends of the supporting cross rod, upper supporting rods are rotationally connected to the connecting seats, lower supporting legs are rotationally connected to the upper supporting rods, and the upper supporting rods and the lower supporting legs are suitable for rotating in the same plane so that the supporting assembly can be switched between a folded state and an unfolded state. A locking push button is movably arranged on the lower supporting leg, a first locking part is arranged on the locking push button, a second locking part is arranged on the connecting seat, the locking push button can be operated to slide from an unlocking position to a locking position, and when the locking push button is located at the locking position, the first locking part and the second locking part are matched in an abutting mode so as to limit the lower supporting leg and the connecting seat to rotate in a separated mode. Therefore, the supporting assembly is kept in an unfolded state. The lower supporting leg can serve as an operation handle for unfolding the supporting assembly and a supporting leg for bearing the supporting assembly, the number of parts of the supporting assembly is reduced, and meanwhile the operation of unfolding and folding the supporting structure by a user is simplified.

Description

Technical Field

[0001] The present application relates to the technical field of folding beds, and in particular to a supporting assembly. Background Art

[0002] A folding bed is a simple bed designed using the principle of joints. It can be folded and stored in various ways for convenience and space saving. Due to the advantages of folding beds such as being easy to use and carry, folding beds can usually play a huge role in outings or outdoor activities. People can take folding beds with them when they go camping or collect materials outdoors, so that they can enjoy a comfortable home experience with minimal space. In addition, the folding bed can be unfolded and folded, so that when the folding bed needs to be transported or stored, the folding bed can be folded, which effectively reduces the volume of the folding bed, thereby reducing the space required for the folding bed, making it convenient for users to carry and store. However, the folding bracket structure of existing folding beds is relatively complicated. When the folding bracket is unfolded or folded, multiple rods need to be rotated in sequence. The unfolding and folding operations are complicated and cumbersome, and the folding bracket after unfolding has poor stability, and the folding bed is prone to shaking during use. Summary of the invention

[0003] One purpose of the present application is to provide a support assembly that is easy to unfold and fold and has good structural stability.

[0004] To achieve the above objectives, the technical solution adopted in the present application is: a support assembly, including a support cross bar and a connecting seat arranged at both ends of the support cross bar, the connecting seat is rotatably connected to an upper support rod, and the upper support rod is rotatably connected to a lower leg, the upper support rod and the lower leg are suitable for rotating in the same plane to enable the support assembly to switch between a folded state and an unfolded state, a locking push button is movably provided on the lower leg, a first locking portion is provided on the locking push button, and a second locking portion is provided on the connecting seat, the locking push button can be operated to slide from an unlocked position to a locked position, and when the locking push button is in the locked position, the first locking portion abuts and cooperates with the second locking portion to limit the rotation of the lower leg and the connecting seat, thereby keeping the support assembly in the unfolded state.

[0005] Preferably, the first locking portion includes an extension member and a stop member, the extension member is vertically arranged on the back of the locking push button, the stop member is arranged at the end of the extension member, the stop member has a first locking plane, a receiving cavity is provided on the second locking portion, the second locking portion has a second locking plane, and the locking push button is suitable for driving the stop member to slide into the receiving cavity so that the first locking plane and the second locking plane abut and cooperate with each other, thereby limiting the lower leg from separating and rotating from the connecting seat.

[0006] As another preference, a reset member is further provided between the locking push button and the lower leg, and the reset member is suitable for continuously applying a force to the locking push button to move toward the locking position, so that the locking push button can move to the locking position after the external force acting on the locking push button is removed.

[0007] Further preferably, the upper support rod includes a hinged end and a mounting end, the hinged end is rotatably connected to the connecting seat, the mounting end is suitable for detachably connecting to the bed cloth assembly, the top of the lower leg is rotatably connected to the middle part of the upper support rod, the lower leg can be operated to drive the upper support rod to synchronously rotate and fold or rotate and unfold, and when the upper support rod and the lower leg are rotated to the maximum unfolded position, the supporting cross bar, the upper support rod and the lower leg are in a triangular structure.

[0008] Furthermore, the mounting end is provided with a bracket, and the bed cloth assembly is snapped into the bracket so as to be detachably connected to the mounting end.

[0009] Furthermore, the connecting seat includes a first connecting portion for connecting to the supporting cross bar and a second connecting portion for connecting to an upper support rod, the second connecting portion includes two seat side walls and a limiting wall connected between the two seat side walls, the two seat side walls and the limiting wall together enclose a hinge groove, a hinge rod is arranged in the hinge groove, the upper support rod is connected to the hinge rod via the hinge end portion and is rotatably arranged in the hinge groove, and the limiting wall is suitable for the upper support rod and the lower support leg to abut against each other to limit the maximum unfolded position of the upper support rod and the lower support leg.

[0010] Furthermore, the lower support leg includes a bottom support rod and two side support rods, the top ends of the two side support rods are hinged to the middle part of the upper support rod, the bottom ends of the two side support rods are respectively fixedly connected to the left and right ends of the bottom support rod, and the two side support rods are inclined so that the lower support leg is triangular in shape as a whole.

[0011] Furthermore, the side support rod includes a connecting section close to the upper support rod and a supporting section away from the upper support rod, and the supporting section is inclined relative to the connecting section so that an angle is formed between the supporting section and the connecting section, and the angle is an obtuse angle.

[0012] Furthermore, the angle is between 155° and 175°.

[0013] Furthermore, the limiting wall extends in the vertical direction, and the upper support rod is suitable for abutting against the upper end of the limiting wall, so that the upper support rods at both ends of the supporting cross rod are tilted outward, and the supporting cross rod and the upper support rods at both ends of the supporting cross rod are in a trapezoidal structure that is wide at the top and narrow at the bottom, and the connecting section is suitable for abutting against the side end of the limiting wall, so that the connecting section extends in the vertical direction, and the supporting cross rod and the supporting sections at both ends of the supporting cross rod are in a trapezoidal structure that is narrow at the top and wide at the bottom.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] The support assembly of the present application is provided with a locking button on the lower leg, the locking button is provided with a first locking portion, and the connecting seat is provided with a second locking portion. When the upper support rod and the lower leg are rotated to the maximum unfolded position to make the support assembly in the unfolded state, the first locking portion and the second locking portion are locked and cooperated to limit the lower leg from being separated and rotated from the connecting seat, so that the support assembly can be kept in the unfolded state. The lower leg can be used as an "operating handle" for unfolding and a "support structure" for supporting at the same time, which simplifies the structure of the support assembly and also simplifies the operation of unfolding and folding the support assembly by the user; at the same time, in the unfolded support assembly, the supporting cross bar, the upper support rod and the lower leg are in a triangular structure, which can improve the supporting stability and structural strength of the support assembly and avoid shaking, breaking, etc. of the support assembly in the process of supporting the bed cloth assembly, which may lead to safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the support assembly of this application when it is in an unfolded state.

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the support assembly of the present application when it is in a folded state.

[0018] Figure 3 This is a front view of the support assembly of this application when it is in the unfolded state.

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the connecting seat in the support assembly of this application.

[0020] Figure 5 This is a schematic diagram of the three-dimensional structure of the upper support rod in the support assembly of this application.

[0021] Figure 6 This is a schematic diagram of the matching relationship between the lower leg and the locking button in the support assembly of this application.

[0022] Figure 7 This is an exploded schematic diagram of the lower leg, locking button and reset member in the support assembly of this application.

[0023] Figure 8This is a schematic diagram of the three-dimensional structure of the locking push button in the support assembly of this application.

[0024] Fig. 9 This is a cross-sectional stereoscopic schematic diagram of the lower leg, locking push button and reset member in the support assembly of the present application.

[0025] Fig.10 This is a cross-sectional schematic diagram of the support assembly of this application.

[0026] Fig.11 for Fig.10 A local enlarged schematic diagram of point A in the middle.

[0027] Fig.12 This is a three-dimensional schematic diagram of a folding bed formed by combining the support assembly and the bed cloth assembly of the present application.

[0028] In the figure: 100, supporting cross bar; 200, connecting seat; 210, second locking part; 211, accommodating cavity; 212, second locking plane; 213, guiding inclined plane; 220, first connecting part; 230, second connecting part; 231, seat side wall; 232, limiting wall; 233, hinge groove; 234, hinge rod; 300, upper support rod; 310, hinge end; 320, mounting end; 321, bracket; 400, lower leg; 410, side support rod ; 411, connecting section; 412, supporting section; 420, bottom support rod; 430, mounting plate; 431, clearance hole; 432, slide groove; 500, locking push button; 510, first locking part; 511, extension piece; 512, stop piece; 513, first locking plane; 514, guide arc surface; 520, connecting piece; 521, connecting rod body; 522, buckle; 600, reset piece; 700, bed cloth assembly; 710, bed cloth support rod; 720, bed cloth. DETAILED DESCRIPTION

[0029] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0031] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0032] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0033] like Figure 1-12 As shown, the present application provides a support assembly, which is suitable for use with a bed cloth assembly 700 to be assembled into a folding bed. The support assembly includes a support cross bar 100 and a connecting seat 200 arranged at both ends of the support cross bar 100, an upper support bar 300 is rotatably connected to the connecting seat 200, and a lower support leg 400 is rotatably connected to the upper support bar 300, the upper support bar 300 is suitable for rotating closer to or away from the support cross bar 100 in the same plane to switch the support assembly between a folded state and an unfolded state; a locking push button 500 is movably arranged on the lower support leg 400, and the locking push button 500 can be operated to slide between a locked position and an unlocked position, a first locking portion 510 is arranged on the back of the locking push button 500, and a second locking portion 210 is arranged on the connecting seat 200, the first locking portion 510 is suitable for locking and cooperating with the second locking portion 210 to lock the rotation of the lower leg 400, to prevent the lower leg 400 from separating from the connecting seat 200 and rotating close to the support cross bar 100, causing the support assembly to switch from the unfolded state to the folded state. The bed cloth assembly 700 includes two bed cloth support rods 710 and a bed cloth 720 connected between the two bed cloth support rods 710. The bed cloth support rods 710 are suitable for being detachably mounted on the upper support rods 300. When the support assembly is in the unfolded state, the upper support rods 300 at both ends of the supporting cross bar 100 move away from each other to pull apart the two bed cloth support rods 710 and thereby support the bed cloth 720.

[0034] Specifically, Figure 1 As shown, when the support assembly is in the unfolded state, the upper support rod 300 and the lower support leg 400 are rotated away from the support cross bar 100 to the maximum unfolded position, and the two upper support rods 300 at both ends of the support cross bar 100 are tilted outward to open the bed sheet assembly 700, and the two lower support legs 400 at both ends of the support cross bar 100 are in contact with the placement plane, and the first locking portion 510 on the locking push button 500 is locked with the second locking portion 210 on the connecting seat 200 to limit the rotation of the lower support leg 400, thereby stably maintaining the support assembly in the unfolded state and preventing the bed sheet 720 from being folded. Figure 2As shown, when the support assembly is in the folded state, the upper support rod 300 and the lower support leg 400 are close to each other and fit on the top of the support cross bar 100.

[0035] Furthermore, the connecting seat 200 includes a first connecting portion 220 and a second connecting portion 230, the second connecting portion 230 is arranged above the first connecting portion 220, the end of the supporting cross bar 100 is fixedly connected to the first connecting portion 220, one end of the upper support rod 300 is rotatably connected to the second connecting portion 230, the other end of the upper support rod 300 is detachably connected to the bed cloth support rod 710, the top of the lower support leg 400 is rotatably connected to the upper support rod 300, the user can operate the lower support leg 400 to drive the upper support rod 300 to rotate and unfold or rotate and fold, and wait for the upper support rod 300 and the lower support leg 400 to rotate to the maximum expansion. When in the unfolded position, the first locking portion 510 on the locking button 500 cooperates with the second locking portion 210 on the connecting seat 200 to lock the support assembly in the unfolded state, and the bottom of the lower leg 400 contacts the placement plane to support the upper support rod 300, the supporting cross bar 100 and the bed cloth assembly 700. In other words, the lower leg 400 can simultaneously serve as an "operating handle" for unfolding and folding the support assembly and a "support structure" for supporting the support assembly, which simplifies the structure of the support assembly while also simplifying the user's operation of unfolding or folding the support assembly, making it easier and faster for the user to unfold and fold the support assembly.

[0036] In some preferred embodiments, Figure 3-7 As shown, the first connecting portion 220 extends in the horizontal direction, and the second connecting portion 230 extends in the vertical direction. The second connecting portion 230 is integrally formed and vertically arranged above the first connecting portion 220, so that the connecting seat 200 is an L-shaped structure as a whole. The end of the supporting cross bar 100 is fixedly connected to the first connecting portion 220 by fasteners such as bolts. The second connecting portion 230 includes two oppositely arranged seat side walls 231, and a limiting wall 232 is arranged between the two seat side walls 231. The limiting wall 232 also extends in the vertical direction. The two seat side walls 231 and the limiting wall 232 are in a U-shaped structure, and then the two seat side walls 231 and the limiting wall 232 are jointly enclosed to form a hinge groove 233, and a hinge rod 234 is arranged in the hinge groove 233. The two ends of the hinge rod 234 are rotatably connected to the two seat side walls 231 respectively. The limiting wall 232 is adapted to abut against the upper support rod 300 and the lower support leg 400 to limit the maximum deployment position of the upper support rod 300 and the lower support leg 400, and play a certain supporting role on the upper support rod 300 and the lower support leg 400, thereby improving the structural stability of the support assembly. Figure 3As shown, when the upper support rod 300 and the lower support leg 400 are rotated to the maximum expanded position, the support assembly is in the expanded state, and the upper support rod 300 abuts against the upper end of the limiting wall 232, so that the upper support rods 300 at both ends of the supporting cross bar 100 are tilted outward, and the supporting cross bar 100 and the upper support rods 300 at both ends of the supporting cross bar 100 are in a trapezoidal structure that is wide at the top and narrow at the bottom, thereby improving the supporting stability of the upper support rod 300 on the bed cloth assembly 700, and the lower support leg 400 abuts against the side end of the limiting wall 232, so that the lower support legs 400 at both ends of the supporting cross bar 100 extend in the vertical direction, and the lower support legs 400 are perpendicular to the placement plane, thereby ensuring the supporting stability of the lower support legs 400 on the upper support rod 300 and the bed cloth assembly 700.

[0037] The upper support rod 300 includes a hinged end 310 and a mounting end 320. The hinged end 310 is connected to the hinge rod 234 and is rotatably arranged in the hinge groove 233, so that the upper support rod 300 can be rotated close to or away from the support cross bar 100. The mounting end 320 is provided with a bracket 321, which is made of elastic plastic and has an opening. The bed cloth support rod 710 can be detachably clamped in the bracket 321 through the opening. The bed cloth support rod 710 can be clamped in the mounting end 320 when the support assembly is unfolded. The bed cloth support rod 710 can be separated from the mounting end 320 when the support assembly is folded, thereby further reducing the volume of the folding bed after folding and storage. Of course, other detachable connection methods can also be used between the bed cloth support rod 710 and the mounting end 320, such as: clamps, etc.

[0038] The lower support leg 400 includes a bottom support rod 420 and two side support rods 410. The top ends of the two side support rods 410 are hinged to the middle part of the upper support rod 300, and the bottom ends of the two side support rods 410 are respectively connected to the left and right ends of the bottom support rod 420 in an integral manner. The two side support rods 410 are tilted inwardly, so that the lower support leg 400 has a triangular structure as a whole, thereby improving the supporting stability and structural strength of the lower support leg 400.

[0039] Furthermore, the side support rod 410 includes a connecting section 411 at the upper part close to one end of the upper support rod 300 and a supporting section 412 at the lower part away from one end of the upper support rod 300. The supporting section 412 is inclined relative to the connecting section 411 so that an angle is formed between the supporting section 412 and the connecting section 411. The degree of the angle is between 155° and 175°. Preferably, the angle between the supporting section 412 and the connecting end is 170°. The inclined setting of the supporting section 412 relative to the connecting section 411 can improve the supporting stability of the lower support leg 400. When the support assembly is in the expanded state, the connecting section 411 of the side support rod 410 is in contact with the limiting wall 232 and extends in the vertical direction. The supporting section 412 of the side support rod 410 is tilted relative to the placement plane. The supporting sections 412 in the lower legs 400 at both ends of the support cross bar 100 form a trapezoidal structure with a narrow upper part and a wide lower part with the support cross bar 100, thereby further improving the supporting stability and structural strength of the support assembly and avoiding shaking of the support assembly during use.

[0040] Furthermore, if Figure 6-11 As shown, a mounting plate 430 is arranged between the two side support rods 410 of the lower support leg 400, and the locking push button 500 is slidably arranged on the mounting plate 430. A clearance hole 431 for the first locking portion 510 to pass through is provided on the mounting plate 430, and a slide groove 432 is respectively provided on the left and right sides of the clearance hole 431. A connecting piece 520 matching the slide groove 432 is provided on the back of the locking push button 500, and the connecting piece 520 includes a buckle 522 of a connecting rod body 521. The connecting rod body 521 is vertically arranged on the back of the locking push button 500 and extends toward one side of the slide groove 432 and is located in the slide groove 432. The buckle 522 is arranged at the end of the connecting rod body 521 and abuts against the back of the mounting plate 430, so that the locking push button 500 can only slide up and down along the slide groove 432 between the locking position and the unlocking position, and the locking push button 500 cannot move in a direction away from the mounting plate 430 and separate from the mounting plate 430.

[0041] Furthermore, a reset member 600 is provided between the locking push button 500 and the mounting plate 430. The reset member 600 is adapted to continuously apply a force to the locking push button 500 to move it toward the locking position, so that the locking push button 500 can be reset to the locking position after the external force acting on it is removed. In other words, the locking push button 500 is always in the locking position, and can only be moved to the unlocking position after the user applies a force to it, thereby preventing the locking push button 500 from sliding to the unlocking position by itself during use, causing the lower leg 400 to be unlocked. The reset member 600 can be made of any material with elastic energy storage, such as elastic rubber, elastic reed, etc. Preferably, the reset member 600 is implemented as a compression spring, the upper end of the compression spring is connected to the mounting plate 430, and the lower end of the compression spring is sleeved on the positioning column of the locking push button 500. When the user operates the locking push button 500 to slide upward to the unlocking position, the compression spring is compressed and deformed; when the user releases the locking push button 500, the force applied to the locking push button 500 is removed, and the compression spring recovers its deformation to push the locking push button 500 to the locked position.

[0042] The first locking portion 510 specifically includes an extension piece 511 and a stop piece 512. The extension piece 511 is vertically arranged on the back of the locking push button 500, and the stop piece 512 is arranged at the end of the extension piece 511. The extension piece 511 and the stop piece 512 pass through the clearance hole 431. The stop piece 512 has a first locking plane 513 close to the side of the extension piece 511 and a guiding arc surface 514 away from the side of the extension piece 511; the second locking portion 210 is arranged on the connecting seat 200, and the second locking portion 210 and the connecting seat 200 are spaced apart to form a accommodating cavity 211. The second locking portion 210 has a second locking plane 212 close to the side of the accommodating cavity 211 and a guiding inclined surface 213 away from the side of the accommodating cavity 211. When the first locking portion 510 and the second locking portion 210 are locked together, the stop member 512 is located in the accommodating cavity 211, and the first locking plane 513 of the stop member 512 abuts against the second locking plane 212 of the second locking portion 210, preventing the lower leg 400 from rotating in a direction away from the connecting seat 200, thereby locking the support assembly in the expanded state.

[0043] In addition, during the gradual docking process between the first locking portion 510 and the second locking portion 210, the guiding arc surface 514 of the stop member 512 abuts against the guiding inclined surface 213 of the second locking portion 210. The cooperation between the guiding arc surface 514 and the guiding inclined surface 213 enables the stop member 512 to slide upward relative to the second locking portion 210 to compress the reset member 600 until the stop member 512 slides to the upper end surface of the second locking portion 210 and no longer slides upward. At this time, the reset member 600 restores its deformation and pushes the stop member 512 downward into the accommodating cavity 211, so that the first locking plane 513 of the stop member 512 cooperates with the second locking plane 212 of the second locking portion 210 to lock. That is to say, when the user rotates, unfolds and locks the lower leg 400, there is no need to operate the locking button 500. The user only needs to rotate the lower leg 400 to the maximum unfolded position. The first locking portion 510 on the locking button 500 will automatically cooperate with the second locking portion 210 on the connecting seat 200 to lock the rotation of the lower leg 400.

[0044] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A support assembly, characterized in that: The foldable support frame comprises a support cross bar and a connecting seat arranged at both ends of the support cross bar, the connecting seat is rotatably connected to an upper support bar, the upper support bar is rotatably connected to a lower support leg, the upper support bar and the lower support leg are suitable for rotating in the same plane to enable the support assembly to switch between a folded state and an unfolded state, a locking push button is movably arranged on the lower support leg, a first locking portion is arranged on the locking push button, and a second locking portion is arranged on the connecting seat, the locking push button can be operated to slide from an unlocked position to a locked position, and when the locking push button is in the locked position, the first locking portion abuts and cooperates with the second locking portion to limit the rotation of the lower support leg and the connecting seat, thereby keeping the support assembly in the unfolded state.

2. The support assembly according to claim 1, characterized in that The first locking portion includes an extension piece and a stop piece, the extension piece is vertically arranged on the back of the locking push button, the stop piece is arranged at the end of the extension piece, the stop piece has a first locking plane, a receiving cavity is opened on the second locking portion, the second locking portion has a second locking plane, and the locking push button is suitable for driving the stop piece to slide into the receiving cavity so that the first locking plane and the second locking plane abut and cooperate with each other, thereby limiting the lower leg and the connecting seat from rotating separately.

3. The support assembly according to claim 2, characterized in that: A reset member is also provided between the locking push button and the lower leg, and the reset member is suitable for continuously applying a force to the locking push button to move toward the locking position, so that the locking push button can move to the locking position after the external force acting on the locking push button is removed.

4. The support assembly according to any one of claims 1 to 3, characterized in that: The upper support rod includes a hinged end and a mounting end, the hinged end is rotatably connected to the connecting seat, the mounting end is suitable for being detachably connected to the bed cloth assembly, the top of the lower leg is rotatably connected to the middle part of the upper support rod, the lower leg can be operated to drive the upper support rod to synchronously rotate and fold or rotate and unfold, and when the upper support rod and the lower leg are rotated to the maximum unfolded position, the supporting cross bar, the upper support rod and the lower leg are in a triangular structure.

5. The support assembly according to claim 4, characterized in that: The mounting end is provided with a bracket, and the bed cloth assembly is clamped in the bracket so as to be detachably connected to the mounting end.

6. The support assembly according to claim 4, characterized in that The connecting seat includes a first connecting portion for connecting to the supporting cross bar and a second connecting portion for connecting to the upper support rod, the second connecting portion includes two seat side walls and a limiting wall connected between the two seat side walls, the two seat side walls and the limiting wall together enclose a hinge groove, a hinge rod is arranged in the hinge groove, the upper support rod is connected to the hinge rod through the hinge end portion and is rotatably arranged in the hinge groove, and the limiting wall is suitable for the upper support rod and the lower support leg to abut against each other to limit the maximum unfolding position of the upper support rod and the lower support leg.

7. The support assembly according to claim 6, characterized in that The lower supporting leg includes a bottom supporting rod and two side supporting rods. The top ends of the two side supporting rods are hinged to the middle part of the upper supporting rod. The bottom ends of the two side supporting rods are respectively fixedly connected to the left and right ends of the bottom supporting rod. The two side supporting rods are inclined so that the lower supporting leg is triangular in shape as a whole.

8. The support assembly according to claim 7, characterized in that The side support rod comprises a connecting section close to the upper support rod and a supporting section away from the upper support rod, and the supporting section is inclined relative to the connecting section so that an angle is formed between the supporting section and the connecting section, and the angle is an obtuse angle.

9. The support assembly according to claim 8, characterized in that The degree of the angle is 155° to 175°.

10. The support assembly according to claim 8, characterized in that The limiting wall extends in a vertical direction, and the upper support rod is suitable for abutting against the upper end of the limiting wall, so that the upper support rods at both ends of the supporting cross rod are tilted outward, and the supporting cross rod and the upper support rods at both ends of the supporting cross rod are in a trapezoidal structure that is wide at the top and narrow at the bottom, and the connecting section is suitable for abutting against the side end of the limiting wall, so that the connecting section extends in a vertical direction, and the supporting cross rod and the supporting sections at both ends of the supporting cross rod are in a trapezoidal structure that is narrow at the top and wide at the bottom.

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