Sofa frame and sofa

Abstract

The utility model provides a sofa frame and a sofa. The sofa frame comprises a bottom frame, a fixed bracket and a rotating bracket which are hinged together, and a driving mechanism for driving the rotating bracket to rotate relative to the fixed bracket; the bottom frame is connected with the fixing support. And at least one supporting rod is arranged below the rotating bracket. The supporting rod comprises a transverse section flush with the bottom frame and a vertical section connected with the rotating support. The driving mechanism drives the rotating bracket to rotate relative to the fixed bracket, so that the sofa frame can be adjusted at different angles, and the use comfort is improved. Meanwhile, the supporting rods are arranged below the rotating supports, the supporting rods can effectively disperse loads borne by the rotating supports, the bearing capacity of the rotating supports is improved, and the stability of the sofa frame is high.

Description

Technical Field

[0001] The present application relates to the field of furniture, and in particular to a sofa frame and a sofa. Background Art

[0002] As living standards continue to improve, many different sofa types have emerged on the market. The choice and use of a sofa directly impacts the comfort level of daily life. Existing sofas often feature fixed wooden frames, lacking adjustable components and offering limited flexibility to suit the user's needs, resulting in low comfort levels. Furthermore, the rotating brackets of existing adjustable sofas are suspended in the air, lacking a supporting structure. This makes the brackets prone to shaking, and the sofa frames lack stability.

[0003] Therefore, it is necessary to provide an improved sofa frame and sofa to solve the above problems. Summary of the Invention

[0004] The present application provides a sofa frame and a sofa with high comfort and high stability.

[0005] The present application provides a sofa frame, comprising a bottom frame, a fixed bracket and a rotating bracket hinged together, and a driving mechanism for driving the rotating bracket to rotate relative to the fixed bracket, wherein the bottom frame is connected to the fixed bracket; at least one support rod is arranged below the rotating bracket; the support rod includes a horizontal section arranged flush with the bottom frame and a vertical section connected to the rotating bracket.

[0006] Furthermore, there are multiple support rods, and a connecting pipe is provided between at least two adjacent transverse sections; the connecting pipe is arranged flush with the bottom frame.

[0007] Furthermore, the bottom frame and the fixed bracket are connected via a plurality of vertical support tubes; the bottom frame includes two cross bars and two side bars; the two cross bars and the two side bars form a frame structure.

[0008] Furthermore, one end of the driving mechanism is connected to the bottom frame and the fixed bracket, and the other end of the driving mechanism is hinged to the rotating bracket.

[0009] Furthermore, the rotating bracket includes a backrest bracket and a leg support bracket hinged to both sides of the fixed bracket, and the driving mechanism includes two driving motors, and the two driving motors drive the backrest bracket and the leg support bracket respectively.

[0010] Furthermore, support plates are provided at both ends of the driving mechanism, one side of the support plate is fixed to the fixed bracket and the bottom frame, and the other side of the support plate is rotatably connected to the driving motor; the connection point between the driving motor and the support plate is close to the plane where the bottom frame is located.

[0011] Furthermore, the leg support bracket includes a front leg support bracket and a rear leg support bracket hinged together, and the rear leg support bracket is rotatably connected to the fixed bracket; the sofa frame also includes a pull rod, and the two ends of the pull rod are respectively hinged to the front leg support bracket and the fixed bracket through support plates.

[0012] Furthermore, the driving mechanism is located between the plane where the fixing bracket is located and the plane where the bottom frame is located.

[0013] Furthermore, the fixed bracket and the rotating bracket are both provided with a flexible supporting surface and a rigid supporting surface, and the rigid supporting surface is provided on both sides of the flexible supporting surface.

[0014] Furthermore, the horizontal section is arranged at the lower part of the flexible support surface, and the vertical section is arranged at the connection between the flexible support surface and the rigid support surface.

[0015] Furthermore, a serpentine spring is provided in the flexible support surface, and a rigid tube is provided in the rigid support surface; the driving mechanism is provided below the rigid support surface; and the width of the flexible support surface is greater than that of the rigid support surface.

[0016] Furthermore, the middle portion of one of the cross bars is protruding outward, and includes a bending portion protruding in a direction away from the other cross bar and connecting portions provided on both sides of the bending portion and fixed to the two side bars.

[0017] Furthermore, when the sofa frame is fully unfolded, the fixed bracket, the backrest bracket and the leg support bracket are coplanar.

[0018] Furthermore, the bottom frame, the fixed bracket and the rotating bracket are all hollow square steel pipes.

[0019] The present application also provides a sofa, comprising a base plate and the above-mentioned sofa frame, wherein the sofa frame is arranged on the base plate, and the base frame is fixed to the base plate.

[0020] The driving mechanism of the present invention drives the rotating bracket to rotate relative to the fixed bracket, enabling the sofa frame to be adjusted to different angles, improving user comfort. Furthermore, a support rod is provided below the rotating bracket, which effectively disperses the load on the rotating bracket, improving its load-bearing capacity and enhancing the stability of the sofa frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the sofa frame of the present application in the unfolded state.

[0022] Figure 2 yes Figure 1 Side view of the sofa frame shown.

[0023] Figure 3 yes Figure 1 The sofa frame shown is not provided with a schematic diagram of the serpentine spring.

[0024] Figure 4 yes Figure 1 A top view of the sofa frame is shown.

[0025] Figure 5 yes Figure 1 The schematic diagram of the sofa frame shown is in the first lifting state.

[0026] Figure 6 yes Figure 5 Side view of the sofa frame shown.

[0027] Figure 7 yes Figure 5 The sofa frame shown is not provided with a schematic diagram of the serpentine spring.

[0028] Figure 8 yes Figure 1 The schematic diagram of the sofa frame shown is in the second lifting state.

[0029] Figure 9 yes Figure 8 Side view of the sofa frame shown.

[0030] Figure 10 yes Figure 8 The sofa frame shown is not provided with a schematic diagram of the serpentine spring.

[0031] Figure 11 yes Figure 1 The schematic diagram of the sofa frame shown is in the third lifting state.

[0032] Figure 12 yes Figure 11 Side view of the sofa frame shown.

[0033] Figure 13 yes Figure 11 The sofa frame shown is not provided with a schematic diagram of the serpentine spring.

[0034] Description of Figure Numbers:

[0035] 100, hinge point; 200, hinge point; 300, hinge point; 400, hinge point; 500, hinge point; 600, hinge point; 700, hinge point; 800, hinge point; 10, bottom frame; 11, crossbar; 111, bottom plate mounting hole; 12, side bar; 13, crossbar; 131, bending portion; 132, connecting portion; 133, bottom plate mounting hole; 20, fixed bracket; 201, main bar; 202, hook; 203, auxiliary bar; 204, outer bar; 30, rotating bracket; 301, main bar; 302, hook ; 303, auxiliary rod; 304, outer rod; 31, backrest bracket; 40, driving mechanism; 32, leg support bracket; 321, front leg support bracket; 322, rear leg support bracket; 41, driving motor; 42, support plate; 43, support plate; 50, vertical support tube; 60, pull rod; 61, reinforcing rib; 70, support rod; 71, horizontal section; 72, vertical section; 73, connecting tube; 80, flexible support surface; 81, serpentine spring; 90, rigid support surface; 91, rigid tube; 92, first rigid support surface; 93, second rigid support surface. DETAILED DESCRIPTION

[0036] Here, the technical solutions in the embodiments (or "implementations") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0037] If there are terms related to directional indications or positional relationships in the embodiments of this application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of this application are only used for the purpose of convenience of description and should not be understood as indicating or implying relative importance.

[0038] See also Figures 1 to 13 As shown, the present application provides a sofa frame. The sofa frame has an unfolded state and a raised state. Figure 1-4 The sofa frame is in the expanded state. Figure 5-7 The middle sofa frame is in the first lifting state. Figure 8-10 The middle sofa frame is in the second lifting state. Figure 11-13 The middle sofa frame is in the third lifting state.

[0039] The sofa frame includes a base frame 10, a fixed bracket 20, a rotating bracket 30, and a drive mechanism 40. The fixed bracket 20 is disposed above and connected to the base frame 10. The rotating bracket 30 is hingedly connected to the fixed bracket 20. One end of the drive mechanism 40 is connected to the base frame 10 and the fixed bracket 20, and the other end of the drive mechanism 40 is connected to the rotating bracket 30. The drive mechanism 40 drives the rotating bracket 30 to rotate relative to the fixed bracket 20.

[0040] The bottom frame 10 includes a cross bar 11, a cross bar 13 and two side bars 12. The cross bar 11, the cross bar 13 and the two side bars 12 form a frame structure. The frame structure is located below the fixed bracket 20. The cross bar 13 is bent. The middle part of the cross bar 13 is protruding outward, that is, the middle part of the cross bar 13 protrudes in the direction away from the cross bar 11. The cross bar 13 includes a bent portion 131 protruding in the direction away from the cross bar 11 and a connecting portion 132 provided on both sides of the bent portion 131 and fixed to the two side bars 12. The bent cross bar 13 can better disperse stress when bearing the load of the fixed bracket 20, thereby improving the strength and stability of the sofa frame.

[0041] According to other embodiments of the present application, the two crossbars 11 and 13 can be parallel square tubes, with the frame structure forming a rectangular frame. Crossbars 11, 13, and the two side bars 12 are all hollow square steel tubes. Depending on the embodiment of the present application, different materials can also be used, such as composite materials and aluminum alloys, to meet the needs of different usage environments.

[0042] Crossbar 11 is provided with four baseplate mounting holes 111. These four baseplate mounting holes 111 are spaced apart along the length of crossbar 11. Crossbar 13 is provided with four baseplate mounting holes 133. Two baseplate mounting holes 133 are provided in the bent portion 131, and one baseplate mounting hole 133 is provided in each of the two connecting portions 132. Both baseplate mounting holes 111 and 133 are circular holes.

[0043] In addition to circular holes, the base plate mounting holes can also be designed as reserved grafting holes or holes of special shapes to be compatible with the installation of different accessories.

[0044] According to an embodiment of the present application, the sofa frame is mounted on a base plate (not shown) of the sofa, and the base frame 10 is secured to the base plate via base plate mounting holes 111 and 133. The four base plate mounting holes 111 and 133 provide multiple mounting points, allowing the base frame 10 to be accurately positioned on the base plate.

[0045] In some embodiments, one or more base plate mounting holes may also be provided on the crossbar 11 and the crossbar 13 .

[0046] The fixed bracket 20 and the rotating bracket 30 are provided with a flexible support surface 80 and a rigid support surface 90, with the rigid support surface 90 located on either side of the flexible support surface 80. The flexible support surface 80 is provided with a plurality of serpentine springs 81 arranged in parallel, while the rigid support surface 90 is provided with a rigid tube 91. The flexible support surface 80 and the rigid support surface 90 are coplanar. The drive mechanism 40 is located below the rigid support surface 90 and adjacent to the flexible support surface 80. Both the fixed bracket 20 and the rotating bracket 30 are hollow square steel tubes.

[0047] The flexible support surface 80 of the fixed bracket 20 is located above the base frame 10. A pair of main rods 201 are positioned opposite each other on either side of the flexible support surface 80. Multiple hooks 202 are spaced along the length of the main rods 201, and the ends of the serpentine springs 81 are fixed to these hooks 202. The serpentine springs 81 extend across the width of the flexible support surface 80 and are located above the base frame 10. Three parallel serpentine springs 81 are positioned within the flexible support surface 80.

[0048] The rigid support surface 90 of the fixed bracket 20 is provided with a secondary rod 203 perpendicular to the main rod 201, and an outer rod 204 connected to the main rod 201 and the secondary rod 203. The outer rod 204 and the main rod 201 form a rectangular horizontal steel pipe frame. Both secondary rods 203 are perpendicular to the main rod 201. Alternatively, the secondary rods 203 can be parallel to the main rod 201, and there can be one or more secondary rods 203.

[0049] The rigid support surface 90 includes a first rigid support surface 92 and a second rigid support surface 93. The first rigid support surface 92 and the second rigid support surface 93 are disposed on both sides of the flexible support surface 80. The width of the flexible support surface 80 is greater than that of the rigid support surface 90.

[0050] According to the embodiment of the present application, the bottom frame 10 and the fixing bracket 20 have the same width and are both located in the middle of the sofa frame.

[0051] In some embodiments, the bottom frame 10 and the fixing bracket 20 are directly fixed, and there is no gap between the bottom frame 10 and the fixing bracket 20 .

[0052] A pair of main rods 301 are disposed opposite each other on either side of the flexible support surface 80 of the rotating bracket 30. A plurality of hooks 302 are spaced apart along the length of the main rods 301, and both ends of the serpentine spring 81 are fixed to the hooks 302. The serpentine spring 81 extends across the width of the flexible support surface 80.

[0053] The rigid support surface 90 of the rotating bracket 30 includes a secondary rod 303 and an outer rod 304 connected to the main rod 301 and the secondary rod 303. The outer rod 304 and the main rod 301 form a rectangular horizontal steel pipe frame. The secondary rod 303 can be perpendicular or parallel to the main rod 301. There can be one or more secondary rods 303.

[0054] The rotating bracket 30 includes a backrest bracket 31 and a leg support bracket 32 ​​hingedly connected to the fixed bracket 20. The driving mechanism 40 drives the backrest bracket 31 to rotate relative to the fixed bracket 20 to provide back support. The driving mechanism 40 drives the leg support bracket 32 ​​to rotate relative to the fixed bracket 20 to provide leg support.

[0055] The leg support bracket 32 ​​includes a front leg support bracket 321 and a rear leg support bracket 322 that are hinged together. The rear leg support bracket 322 is rotatably connected to the fixed bracket 20. The driving mechanism 40 drives the rear leg support bracket 322 to rotate relative to the fixed bracket 20.

[0056] The driving mechanism 40 comprises two driving motors 41, and the two driving motors 41 respectively drive the backrest support 31 and the leg support support 32. The two driving motors 41 are positioned at one side of the sofa frame. The two driving motors 41 are provided with the same side of the sofa frame and are positioned at the same straight line.

[0057] In the unfolded state, the driving mechanism 40 is located between the plane where the fixing bracket 20 is located and the plane where the bottom frame 10 is located, that is, the thickness of the driving mechanism 40 is less than or equal to the gap between the bottom frame 10 and the fixing bracket 20 .

[0058] The drive mechanism 40 is provided with support plates 42 at both ends. One side of the support plates 42 is fixed to the fixing bracket 20 and the bottom frame 10, and the other side of the support plates 42 is rotatably connected to the drive motor 41. The connection point between the drive motor 41 and the support plates 42 is adjacent to the plane of the bottom frame 10.

[0059] The support plates 42 are provided in a pair, and the pair of support plates 42 are provided in parallel. The driving motor 41 is provided between the pair of support plates 42. The support plates 42 are approximately trapezoidal.

[0060] The bottom frame 10 and the fixed bracket 20 are connected by a plurality of vertical support tubes 50. In the embodiment of the present application, there are six vertical support tubes 50, two of which are located close to the drive motor 41, and the remaining four vertical support tubes 50 are located on the side of the sofa frame away from the drive motor 41. Alternatively, multiple vertical support tubes 50 may be provided.

[0061] The sofa frame also includes a pull rod 60. A support plate 43 is provided on the rigid tube 91 within the rigid support surface 90 of the front leg support bracket 321, and another support plate 43 is provided between the bottom frame 10 and the fixed bracket 20. The support plate 43 is located on the outside of the support plate 42. One end of the pull rod 60 is hinged to the front leg support bracket 321 through the support plate 43, and the other end of the pull rod 60 is hinged to the bottom frame 10 and the fixed bracket 20 through the support plate 43. Two pull rods 60 are provided, one on each opposite side of the sofa frame. When the driving mechanism 40 drives the rear leg support bracket 322 to rotate, the front leg support bracket 321 is driven to rotate through the pull rod 60 to adjust the leg support.

[0062] According to an embodiment of the present application, a reinforcing rib 61 is provided on the pull rod 60 along the length direction of the pull rod 60 , and the reinforcing rib 61 protrudes toward the outside of the pull rod 60 .

[0063] Multiple support rods 70 are positioned below the rotating bracket 30. These rods 70 include horizontal sections 71 flush with the base frame 10 and vertical sections 72 connected to the rotating bracket 30. Connecting tubes 73 are located between the horizontal sections 71 of at least two adjacent support rods 70. These connecting tubes 73 are straight and flush with the base frame 10. The support rods 70 are the same width as the flexible support surface 80, providing support and limiting support for the flexible support surface 80, preventing it from exceeding its elastic limit.

[0064] The horizontal section 71 is provided at the lower portion of the flexible support surface 80 , and the vertical section 72 is provided at the connection between the flexible support surface 80 and the rigid support surface 90 .

[0065] The hinge points 100 between the front leg support bracket 321 and the rear leg support bracket 322, the hinge points 200 between the rear leg support bracket 322 and the fixed bracket 20, and the hinge points 300 between the fixed bracket 20 and the backrest bracket 31 are arranged along the front-to-back direction of the sofa frame. The hinge points 400 between the pull rod 60 and the front leg support bracket 321, the hinge points 500 between the pull rod 60 and the support plate 43, and the hinge points 600 between the support plate 42 and the drive motor 41 located below the backrest bracket 31 are also arranged along the front-to-back direction of the sofa frame.

[0066] The hinge point 400 is located in front of the hinge point 100. Along the front-to-back direction of the sofa frame, the hinge point 400 is located in the middle of the front leg support bracket 321, so that the force of the pull rod 60 is transmitted to the entire front leg support bracket 321 and drives the front leg support bracket 321 to rotate.

[0067] Hinge point 500 is located between hinge point 200 and hinge point 100 and below hinge point 200. Hinge points 200 and 500 are located at either end of the hypotenuse of support plate 43, forming a roughly triangular frame that provides greater stability. Hinge point 600 is located behind hinge point 300 and below hinge point 200. Hinge points 300 and 600 are located at either end of the hypotenuse of support plate 42, forming a roughly triangular frame that provides greater stability.

[0068] The hinge point 700 between the drive motor 41 located below the rear leg support bracket 322 and the rear leg support bracket 322 is located on the rear side of the hinge point 400, and the hinge point 700 is located on the side of the rear leg support bracket 322 close to the front leg support bracket 321. When the drive motor 41 drives the rear leg support bracket 322 to rotate, the lever arm is longer, and the drive is more labor-saving.

[0069] A hinge point 800 is formed between the drive motor 41 located below the backrest bracket 31 and the backrest bracket 31. This hinge point 800 is located in the middle of the backrest bracket 31, along the front-to-back direction of the backrest bracket 31. This hinge point 800 is located on the side of the rigid support surface 90 that is closest to the flexible support surface 80. When the drive motor 41 rotates the backrest bracket 31, the lever arm is long, reducing the amount of effort required.

[0070] When the sofa frame is in the extended position, the fixed bracket 20, the backrest bracket 31, and the leg support bracket 32 ​​are coplanar and horizontally arranged. When the sofa frame is in the first lifting position, the fixed bracket 20 is horizontally arranged, the backrest bracket 31 and the rear leg support bracket 322 are tilted, and the front leg support bracket 321 is parallel to the fixed bracket 20. When the sofa frame is in the second lifting position, the fixed bracket 20 is horizontally arranged, the backrest bracket 31, the front leg support bracket 321, and the rear leg support bracket 322 are all tilted. When the sofa frame is in the third lifting position, the fixed bracket 20, the front leg support bracket 321, and the rear leg support bracket 322 are all horizontally arranged and coplanar, and the backrest bracket 31 is tilted.

[0071] The present application also provides a sofa, comprising a base plate and the above-mentioned sofa frame, wherein the sofa frame is arranged on the base plate, and the bottom frame 10 is fixed to the base plate.

[0072] According to an embodiment of the present application, the sofa frame also has an angle memory function and a one-touch reset function. When the user uses the sofa, the sofa frame memorizes the tilt angles of the backrest bracket 31, front leg support bracket 321, and rear leg support bracket 322 during use. When the user uses the sofa again, the sofa frame can be quickly adjusted to the last used state.

[0073] According to the embodiment of the present application, the sofa frame can be used on furniture such as sofas or beds that need to adjust the backrest and leg support. In addition, the sofa frame is also used for the chaise longue position in the sofa combination.

[0074] The drive mechanism 40 of the present invention drives the rotating bracket 30 to rotate relative to the fixed bracket 20, enabling adjustment of the sofa frame to different angles and improving user comfort. Furthermore, a support rod 70 is provided below the rotating bracket 30 to effectively distribute the load on the rotating bracket 30, improving its load-bearing capacity and enhancing the stability of the sofa frame.

[0075] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A sofa frame, characterized in that: It includes a bottom frame, a fixed bracket and a rotating bracket hinged together, and a driving mechanism for driving the rotating bracket to rotate relative to the fixed bracket. The bottom frame is connected to the fixed bracket; at least one support rod is set below the rotating bracket; the support rod includes a horizontal section arranged flush with the bottom frame and a vertical section connected to the rotating bracket.

2. The sofa frame according to claim 1, characterized in that: There are multiple support rods, and a connecting pipe is provided between at least two adjacent transverse sections; the connecting pipe is arranged flush with the bottom frame.

3. The sofa frame according to claim 2, characterized in that: The bottom frame and the fixed bracket are connected via a plurality of vertical support tubes; the bottom frame comprises two cross bars and two side bars; the two cross bars and the two side bars form a frame structure.

4. The sofa frame according to claim 3, characterized in that: One end of the driving mechanism is connected to the bottom frame and the fixed bracket, and the other end of the driving mechanism is hinged to the rotating bracket.

5. The sofa frame according to claim 4, characterized in that: The rotating bracket includes a backrest bracket and a leg support bracket hinged to both sides of the fixed bracket, and the driving mechanism includes two driving motors, which respectively drive the backrest bracket and the leg support bracket.

6. The sofa frame according to claim 5, characterized in that: Support plates are provided at both ends of the driving mechanism, one side of the support plate is fixed to the fixed bracket and the bottom frame, and the other side of the support plate is rotatably connected to the driving motor; the connection point between the driving motor and the support plate is close to the plane where the bottom frame is located.

7. The sofa frame according to claim 5, characterized in that: The leg support bracket includes a front leg support bracket and a rear leg support bracket hinged together, and the rear leg support bracket is rotatably connected to the fixed bracket; the sofa frame also includes a pull rod, and the two ends of the pull rod are respectively hinged to the front leg support bracket and the fixed bracket through support plates.

8. The sofa frame according to claim 4, characterized in that: The driving mechanism is located between the plane where the fixing bracket is located and the plane where the bottom frame is located.

9. The sofa frame according to claim 1, characterized in that: The fixed bracket and the rotating bracket are both provided with a flexible supporting surface and a rigid supporting surface, and the rigid supporting surface is provided on both sides of the flexible supporting surface.

10. The sofa frame according to claim 9, characterized in that: The horizontal section is arranged at the lower part of the flexible support surface, and the vertical section is arranged at the connection between the flexible support surface and the rigid support surface.

11. The sofa frame according to claim 9, characterized in that: A serpentine spring is provided in the flexible support surface, and a rigid tube is provided in the rigid support surface; the driving mechanism is provided below the rigid support surface; and the width of the flexible support surface is greater than that of the rigid support surface.

12. The sofa frame according to claim 3, characterized in that The middle portion of one of the cross bars is protruding outward, and comprises a bending portion protruding in a direction away from the other cross bar and connecting portions provided on both sides of the bending portion and fixed to the two side bars.

13. The sofa frame according to claim 5, characterized in that When the sofa frame is fully unfolded, the fixed bracket, the backrest bracket and the leg support bracket are coplanar.

14. The sofa frame according to claim 1, characterized in that The bottom frame, the fixed bracket and the rotating bracket are all hollow square steel pipes.

15. A sofa, characterized in that: The sofa comprises a bottom plate and a sofa frame according to any one of claims 1 to 14, wherein the sofa frame is arranged on the bottom plate, and the bottom frame is fixed to the bottom plate.

Images