Backrest structure and furniture

Abstract

The utility model provides a backrest structure and furniture. The backrest structure comprises a pair of backrest side plates and a pair of connecting piece mounting parts arranged on the backrest side plates, the backrest side plates are made of plastic, and each backrest side plate comprises a side plate body and a containing part integrally formed with the side plate body; the containing part and the side plate body jointly form a containing groove, the connecting piece installation part is partially located in the containing groove, and a connecting piece insertion opening is formed below the containing groove. The backrest structure and the furniture are convenient to install, and cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of furniture, and particularly to a backrest structure and furniture. Background Art

[0002] When designing and manufacturing furniture, especially when making disassembled and assembled furniture, the stable connection between the backrest and the seat frame is a key issue. Traditional furniture mostly has a wooden frame. Restricted by the low structural plasticity of wooden materials, it is often necessary to separately provide male and female adapters on the backrest and the seat frame, that is, to separately provide corresponding backrest connectors and seat frame connectors on the backrest and the seat frame, and fix the two by plugging. This connection method not only requires cumbersome manufacturing and installation processes, but also has a high manufacturing cost.

[0003] Therefore, it is necessary to provide an improved backrest structure and furniture to solve the above problems. Summary of the Utility Model

[0004] The present application provides a backrest structure and furniture that are easy to install and cost-saving.

[0005] The present application discloses a backrest structure, including a pair of backrest side plates and a pair of connector mounting parts arranged on the backrest side plates. The material of the backrest side plates is plastic. The backrest side plates include a side plate body and a receiving part integrally formed with the side plate body; the receiving part and the side plate body jointly form a receiving groove, part of the connector mounting part is located in the receiving groove, and a connector insertion opening is formed below the receiving groove.

[0006] Further, the backrest side plates and the connector mounting parts are integrally formed. The connector mounting parts include elastic arms and hooks. The upper and lower ends of the elastic arms are respectively connected to the backrest side plates and the hooks.

[0007] Further, the elastic arms and the side plate bodies are respectively located on the inner and outer sides of the receiving groove. The elastic arms can elastically deform in the inner and outer directions, and the hooks extend from the elastic arms into the receiving groove.

[0008] Further, the receiving part includes a connecting plate and a reinforcing plate. The connecting plate is perpendicular to the side plate body. The reinforcing plate is connected to the connecting plate and covers the upper part of the receiving groove. The reinforcing plate is joined to the upper end of the elastic arm.

[0009] Further, the receiving part includes a connecting plate and a limiting plate. The connecting plate is perpendicular to the side plate body. The limiting plate is connected to the connecting plate and covers the lower part of the receiving groove.

[0010] Further, the limiting plate and the elastic arm are respectively located on the inner and outer sides of the receiving groove. The elastic arm can elastically deform in the inner and outer directions, and the hook extends inward from the elastic arm into the receiving groove.

[0011] Further, the number of the connecting member mounting parts is two. The two elastic arms are respectively located on the front and rear sides of the receiving groove and can elastically deform in the front and rear directions. The two hooks are arranged oppositely and extend into the receiving groove from the elastic arms.

[0012] Further, the material of the connecting member mounting part is plastic or metal, and the backrest side plate is assembled and connected with the connecting member mounting part.

[0013] Further, the backrest side plate is connected with the connecting member mounting part by bolts. A connection hole matching with the bolt is formed on the connecting member mounting part, a screwing part matching with the bolt is arranged on the backrest side plate, and a thread is arranged in the screwing part.

[0014] Further, the backrest side plate is assembled and connected with the connecting member mounting part by one of the ways of bonding, riveting, welding and plugging.

[0015] Further, the backrest side plate and the connecting member mounting part are integrally molded with inserts. The connecting member mounting part includes a reinforcing arm, an elastic arm and a hook.

[0016] Further, the reinforcing arm is perpendicular to the side plate body. The upper and lower ends of the elastic arm are respectively connected with the reinforcing arm and the hook, and the hook extends into the receiving groove.

[0017] Further, a support rib is arranged on the inner side of the side plate body. The support rib is located in the receiving groove, and the length of the support rib in the inner and outer directions is less than the length of the receiving groove in the inner and outer directions.

[0018] Further, a guard plate and a plurality of reinforcing ribs are further arranged on the inner side of the side plate body. The guard plate is sleeved on the periphery of the receiving part, and the plurality of reinforcing ribs are arranged in a staggered manner.

[0019] The present application also discloses a piece of furniture, including a seat frame structure, a pair of seat frame connecting members and the backrest structure as described above. The seat frame connecting members connect the seat frame structure and the backrest structure.

[0020] Further, the seat frame connecting member includes a backrest connecting part and a seat frame connecting part. The backrest connecting part is inserted into the receiving groove and is in snap-fit connection with the connecting member mounting part, and the seat frame connecting part is fixed to the seat frame structure.

[0021] Further, a mating portion that is snap-fitted with the connector mounting portion is provided on the backrest connection portion, and the mating portion is an opening; alternatively, the mating portion is a hook groove provided in a recessed manner.

[0022] In the backrest structure and the furniture of the present application, by setting the material of the backrest side plate to plastic, the accommodating portion can be integrally formed with the side plate body. The accommodating portion and the side plate body together form an accommodating groove for accommodating the seat frame connector, and cooperate with the connector mounting portion to fix the seat frame connector to the backrest side plate. With such a setting, the functions of the backrest connector in the prior art are integrated on the backrest side plate, and the connection between the backrest structure and the seat frame structure can be realized only by inserting the seat frame connector, saving material costs and simplifying the manufacturing and installation processes.

[0023] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with this specification, and are used together with the specification to explain the principles of this specification.

[0025] Figure 1 is a perspective view of the assembled backrest structure and the seat frame connector in the first embodiment of the present application.

[0026] Figure 2 is Figure 1 a partially enlarged view of the assembled backrest structure and the seat frame connector in

[0027] Figure 3 is Figure 1 a partially enlarged view of the backrest structure in

[0028] Figure 4 is Figure 1 a partially left view of the backrest structure in

[0029] Figure 5 is a side view of the seat frame connector in the first embodiment of the present application.

[0030] Figure 6 is a partially enlarged view of the assembled backrest structure and the seat frame connector in the second embodiment of the present application.

[0031] Figure 7 is Figure 6 a partially enlarged view of the backrest structure in

[0032] Figure 8 is Figure 6 a partially left view of the backrest structure in

[0033] Figure 9It is a partial enlarged view after the backrest structure and the seat frame connecting member of Embodiment 3 of the present application are assembled.

[0034] Figure 10 It is Figure 9 a partial enlarged view of the backrest structure in

[0035] Figure 11 It is Figure 9 a partial left view of the backrest structure in

[0036] Figure 12 It is a side view of the seat frame connecting member of Embodiment 3 of the present application.

[0037] Figure 13 It is a partial enlarged view of the backrest structure of Embodiment 4 of the present application.

[0038] Figure 14 It is a partial front view of the backrest structure of Embodiment 5 of the present application.

[0039] Explanation of the reference numerals in the drawings: 10, backrest side plate; 11, side plate body; 111, support rib; 112, reinforcing rib; 113, protective plate; 12, receiving portion; 121, connecting plate; 122, reinforcing plate; 123, limiting plate; 14, screwing portion; 20, connecting member mounting portion; 21, elastic arm; 22, hook; 23, reinforcing arm; 30, receiving groove; 31, connecting member insertion port; 40, seat frame connecting member; 41, backrest connecting portion; 411, mating portion; 42, seat frame connecting portion. Detailed implementation manners

[0040] Here, the technical solutions in the embodiments (or "implementation manners") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description involves the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0041] If there are terms related to directional indication or positional relationship in the embodiments of the present 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.), then such terms are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings); if this specific posture changes, then the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only for the purpose of convenient description and cannot be understood as indicating or implying relative importance.

[0042] Next, the embodiments of the present application will be described in detail. In the present application, the front side refers to the side facing the user when sitting on the furniture, the rear side refers to the side facing away from the user when sitting on the furniture, the inner side refers to the side close to the user, and the outer side refers to the side away from the user.

[0043] Embodiment 1:

[0044] As Figure 1 and Figure 2 shown, this embodiment provides a backrest structure, including a pair of backrest side plates 10 and a pair of connecting member mounting parts 20 provided on the backrest side plates 10. The backrest side plates 10 and the connecting member mounting parts 20 cooperate together to fix the seat frame connecting member 40, so that the backrest structure and the seat frame connecting member 40 are assembled together.

[0045] The backrest side plate 10 includes a side plate body 11 and a receiving part 12 integrally formed with the side plate body 11. The receiving part 12 and the side plate body 11 together form a receiving groove 30 for receiving the seat frame connecting member 40, and a connecting member insertion opening 31 is formed below the receiving groove 30. The seat frame connecting member 40 includes a backrest connecting part 41, and the backrest connecting part 41 is inserted into the receiving groove 30 from the connecting member insertion opening 31. Part of the connecting member mounting part 20 is located in the receiving groove 30 and is snap-fitted with the backrest connecting part 41 located in the receiving groove 30.

[0046] Please also refer to Figure 3 and Figure 4 , the receiving part 12 is located inside the side plate body 11 and includes a connecting plate 121 and a reinforcing plate 122. The connecting plate 121 is perpendicular to the side plate body 11 and is wound around the seat frame connecting member 40 to perform profiling limitation on the backrest connecting part 41. The reinforcing plate 122 is arranged parallel to the side plate body 11, and the reinforcing plate 122 is connected to the connecting plate 121 and covers the upper part of the receiving groove 30.

[0047] The connecting member mounting part 20 is integrally formed with the backrest side plate 10. The connecting member mounting part 20 includes an elastic arm 21 and a hook 22. The upper and lower ends of the elastic arm 21 are respectively connected to the backrest side plate 10 and the hook 22. Specifically, the elastic arm 21 and the side plate body 11 are respectively located on the inner and outer sides of the receiving groove 30, the reinforcing plate 122 is joined to the upper end of the elastic arm 21, and the elastic arm 21 can elastically deform in the inner and outer directions. The hook 22 extends from the elastic arm 21 into the receiving groove 30. The hook 22 includes a horizontally arranged top surface and an inclined guiding surface, and the guiding surface is inclined upward gradually from the inside to the outside.

[0048] Please also refer to Figure 5, a mating portion 411 for snap - connecting with the connector mounting portion 20 is provided on the backrest connection portion 41, and the mating portion 411 is an opening. When the backrest structure is snap - connected to the seat frame connector 40, the top surface of the hook 22 abuts against the top wall of the mating portion 411, so that the seat frame connector 40 will not disengage from the hook 22. The setting of the connector mounting portion 20 makes the connection between the backrest structure and the seat frame connector 40 more stable and reliable, and the assembly process is simple and easy to operate.

[0049] When assembling the backrest structure and the seat frame connector 40, the seat frame connector 40 is fixedly arranged on the seat frame structure, and the backrest side plate 10 is inserted into the seat frame connector 40 from top to bottom. The backrest connection portion 41 is inserted into the receiving groove 30 from the connector insertion port 31, and the hook 22 first contacts the backrest connection portion 41. The elastic arm 21 elastically deforms toward the side away from the receiving groove 30 as the backrest structure continues to move downward, and resumes deformation after the hook 22 extends into the mating portion 411, completing the fixation of the backrest structure and the seat frame connector 40. The overall assembly process is simple and easy to operate, which can improve the assembly efficiency and save assembly time.

[0050] Furthermore, support ribs 111 are provided on the inner side of the side plate body 11. The support ribs 111 are located in the receiving groove 30, and the length of the support ribs 111 in the inner - outer direction is less than the length of the receiving groove 30 in the inner - outer direction. The support ribs 111 support the seat frame connector 40 from the outside, making its contact with the side plate body 11 more stable and reliable.

[0051] Furthermore, a protective plate 113 and a number of reinforcing ribs 112 are also provided on the inner side of the side plate body 11. The protective plate 113 is sleeved around the periphery of the receiving portion 12, and the number of reinforcing ribs 112 are arranged in a staggered manner to strengthen the strength of the backrest side plate 10.

[0052] In this embodiment, the side plate body 11 limits the seat frame connector 40 from the outside, the elastic arm 21 and the reinforcing plate 122 simultaneously limit the seat frame connector 40 from the inside, the connecting plate 121 limits the seat frame connector 40 on the front - rear sides and the upper side, and the hook 22 limits the seat frame connector 40 on the lower side.

[0053] By jointly limiting the seat frame connector 40 through the backrest side plate 10 and the connector mounting portion 20, the stability of the connection between the seat frame connector 40 and the backrest structure is improved, the risk of loosening or falling off of the seat frame connector 40 during use is reduced, and the service life is extended. Furthermore, the connection between the backrest structure and the seat frame structure is also more stable, providing a more reliable user experience for users. In addition, during the assembly process, the operator does not need to adjust the position and angle of the seat frame connector 40 additionally, and only needs to insert the seat frame connector 40 into the receiving groove 30, which greatly reduces the assembly difficulty and time cost.

[0054] The backrest side plates 10 and the connecting member mounting portions 20 in this embodiment are both made of plastic and are formed by injection molding or blow molding. Compared with traditional wooden backrest side plates, in the backrest structure of this embodiment, by setting the materials of the backrest side plates 10 and the connecting member mounting portions 20 as plastic and integrally molding them, the seat frame connecting member 40 can be directly and conveniently fixed to the backrest structure without the need for other structures for transfer, simplifying the manufacturing and installation process while saving material costs. In addition, other structures such as reinforcing ribs 112, protective plates 113 or other functional components can be integrally molded on the plastic backrest side plates 10 flexibly to meet the personalized needs of the product.

[0055] This embodiment also provides a piece of furniture, including a seat frame structure, a pair of seat frame connecting members 40 and the backrest structure as above, and the seat frame connecting member 40 connects the seat frame structure and the backrest structure.

[0056] Specifically, the seat frame connecting member 40 includes a backrest connecting portion 41 and a seat frame connecting portion 42. The backrest connecting portion 41 is inserted into the receiving groove 30 and is in snap-fit with the connecting member mounting portion 20, and the seat frame connecting portion 42 is fixed to the seat frame structure.

[0057] Embodiment Two:

[0058] As Figures 6 to 8 shown, the difference between this embodiment and Embodiment 1 is that the receiving portion 12 includes a connecting plate 121 and a limiting plate 123. The connecting plate 121 is perpendicular to the side plate body 11 and is wound around the seat frame connecting member 40 to perform profiling limitation on the backrest connecting portion 41. The limiting plate 123 is arranged parallel to the side plate body 11, and the limiting plate 123 is connected to the connecting plate 121 and covers the lower part of the receiving groove 30.

[0059] The limiting plate 123 and the elastic arm 21 are respectively located on the inner and outer sides of the receiving groove 30, and the upper end of the elastic arm 21 is joined to the side plate body 11. The elastic arm 21 can elastically deform in the inner and outer directions, and the hook 22 extends inward from the elastic arm 21 into the receiving groove 30. The hook 22 includes a horizontally arranged top surface and an inclined guiding surface, and the guiding surface is inclined upward gradually from the outside to the inside.

[0060] In this embodiment, the side plate body 11 and the elastic arm 21 simultaneously perform outer side limitation on the seat frame connecting member 40, the limiting plate 123 performs inner side limitation on the seat frame connecting member 40, the connecting plate 121 performs front, rear and upper side limitations on the seat frame connecting member 40, and the hook 22 performs lower side limitation on the seat frame connecting member 40.

[0061] Embodiment Three:

[0062] As Figures 9 to 11As shown, the difference between this embodiment and the first embodiment is that the receiving portion 12 includes a connecting plate 121 and a limiting plate 123, the connecting plate 121 is perpendicular to the side plate body 11, and is arranged around the seat frame connecting member 40 to perform contour limiting on the backrest connecting portion 41. The limiting plate 123 is arranged parallel to the side plate body 11, and the limiting plate 123 is connected to the connecting plate 121 and covers the lower part of the receiving groove 30.

[0063] There are two connector mounting parts 20, and two elastic arms 21 are respectively located at the front and rear sides of the receiving groove 30 and can be elastically deformed in the front-to-back direction. Two hooks 22 are arranged opposite to each other and extend from the elastic arms 21 into the receiving groove 30. The hooks 22 include a horizontally arranged top surface and an inclined guide surface, and the guide surface is gradually inclined upward from the side away from the receiving groove 30 to the side close to the receiving groove 30.

[0064] Please also refer to Figure 12 The top of the backrest connecting part 41 is arc-shaped, and the matching part 411 is a recessed hook groove. There are two matching parts 411, which are respectively provided at the front and rear sides of the backrest connecting part 41. When the backrest structure is engaged with the seat frame connecting member 40, the top surface of the hook 22 abuts against the top wall of the matching part 411, so that the seat frame connecting member 40 will not be separated from the hook 22.

[0065] In this embodiment, the side panel body 11 limits the seat frame connecting part 40 on the outside, the limiting plate 123 limits the seat frame connecting part 40 on the inside, the elastic arm 21 and the connecting plate 121 limit the front and rear sides of the seat frame connecting part 40 at the same time, the connecting plate 121 limits the upper side of the seat frame connecting part 40, and the hook 22 limits the lower side of the seat frame connecting part 40.

[0066] Embodiment 4:

[0067] like Figure 13 As shown, the difference between this embodiment and the first embodiment is that the backrest side plate 10 is assembled and connected with the connecting member mounting portion 20, and the material of the connecting member mounting portion 20 is plastic or metal.

[0068] Specifically, the backrest side plate 10 is connected to the connector mounting portion 20 by means of a bolt 50. The connector mounting portion 20 is provided with a connection hole matched with the bolt 50, and the backrest side plate 10 is provided with a screw connection portion 14 matched with the bolt 50, and a thread is provided in the screw connection portion 14. By providing a thread in the screw connection portion 14, it is possible to avoid embedding nuts on the backrest side plate 10, and the labor cost of tapping the profile threaded hole is lower than that of embedding plastic nuts, which further saves costs.

[0069] In some cases, the connector mounting portion 20 may also be assembled to the backrest side panel 10 by other methods such as riveting, bonding, welding, and plug-in.

[0070] Embodiment 5:

[0071] As Figure 14 shown, the difference between this embodiment and Embodiment 1 is that the backrest side plate 10 and the connector mounting part 20 are insert molded, and the material of the connector mounting part 20 is plastic or metal.

[0072] The connector mounting part 20 includes a reinforcing arm 23, an elastic arm 21 and a hook 22. The reinforcing arm 23 is perpendicular to the side plate body 11. The upper and lower ends of the elastic arm 21 are respectively connected to the reinforcing arm 23 and the hook 22, and the hook 22 extends into the receiving groove 30.

[0073] During the insert molding process, the connector mounting part 20 is placed in an injection mold and injection molded with the backrest side plate 10 as a whole. Among them, the reinforcing arm 23 is entirely embedded in the backrest side plate 10, which improves the connection strength and makes the connection of the connector mounting part 20 more stable.

[0074] Insert molding can achieve high-precision and consistent part manufacturing. By precisely controlling the injection process and mold design, precise dimensions, shapes and surface qualities can be obtained. And a large number of parts can be manufactured simultaneously, reducing the production and manufacturing costs and improving production efficiency.

[0075] In the backrest structure and furniture of the present application, by setting the material of the backrest side plate 10 to plastic, the receiving part 12 can be integrally formed with the side plate body 11. The receiving part 12 and the side plate body 11 together form a receiving groove 30 for receiving the seat frame connector 40, and cooperate with the connector mounting part 20 to fix the seat frame connector 40 to the backrest side plate 10. With such a setting, the functions of the backrest connector in the prior art are integrated on the backrest side plate 10, and the connection between the backrest structure and the seat frame structure can be realized only by inserting the seat frame connector, saving material costs and simplifying the manufacturing and installation processes.

[0076] 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 the present application is not limited to the precise structures described in the above embodiments and shown in the drawings; any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

Claims

1. A backrest structure, characterized in that: It includes a pair of backrest side panels and a pair of connector mounting parts arranged on the backrest side panels, the backrest side panels are made of plastic, and the backrest side panels include a side panel body and a receiving part integrally formed with the side panel body; the receiving part and the side panel body together form a receiving groove, the connector mounting part is partially located in the receiving groove, and a connector insertion port is formed below the receiving groove.

2. The backrest structure according to claim 1, characterized in that: The backrest side plate and the connector mounting portion are integrally formed, and the connector mounting portion includes an elastic arm and a buckle hook, and the upper and lower ends of the elastic arm are respectively connected to the backrest side plate and the buckle hook.

3. The backrest structure according to claim 2, characterized in that: The elastic arm and the side plate body are respectively located at the inner and outer sides of the receiving groove, the elastic arm can be elastically deformed along the inner and outer directions, and the buckle hook extends outward from the elastic arm into the receiving groove.

4. The backrest structure according to claim 3, characterized in that: The receiving portion includes a connecting plate and a reinforcing plate, wherein the connecting plate is perpendicular to the side plate body, the reinforcing plate is connected to the connecting plate and covers the upper portion of the receiving groove, and the reinforcing plate is engaged with the upper end of the elastic arm.

5. The backrest structure according to claim 2, characterized in that: The receiving portion comprises a connecting plate and a limiting plate, wherein the connecting plate is perpendicular to the side plate body, and the limiting plate is connected to the connecting plate and covers the lower part of the receiving groove.

6. The backrest structure according to claim 5, characterized in that: The limiting plate and the elastic arm are respectively located at the inner and outer sides of the receiving groove, the elastic arm can be elastically deformed along the inner and outer directions, and the buckle hook extends inwardly from the elastic arm into the receiving groove.

7. The backrest structure according to claim 5, characterized in that: There are two connector mounting parts, the two elastic arms are respectively located at the front and rear sides of the receiving groove and can be elastically deformed along the front and rear directions, and the two hooks are arranged opposite to each other and extend from the elastic arms into the receiving groove.

8. The backrest structure according to claim 1, characterized in that: The material of the connector mounting portion is plastic or metal, and the backrest side plate is assembled and connected with the connector mounting portion.

9. The backrest structure according to claim 8, characterized in that: The backrest side plate is connected to the connector mounting portion by bolts. The connector mounting portion is provided with a connecting hole matched with the bolt. The backrest side plate is provided with a screw connection portion matched with the bolt. The screw connection portion is provided with a thread.

10. The backrest structure according to claim 8, characterized in that: The backrest side plate and the connector mounting portion are assembled and connected by bonding, riveting, welding, or plugging.

11. The backrest structure according to claim 1, characterized in that: The backrest side plate and the connector mounting portion are insert-molded, and the connector mounting portion includes a reinforcing arm, an elastic arm and a buckle hook.

12. The backrest structure according to claim 11, characterized in that: The reinforcing arm is perpendicular to the side plate body, the upper and lower ends of the elastic arm are respectively connected to the reinforcing arm and the buckle hook, and the buckle hook extends into the receiving groove.

13. The backrest structure according to claim 1, characterized in that: A supporting rib is disposed on the inner side of the side plate body. The supporting rib is located in the receiving groove, and the length of the supporting rib in the inner and outer directions is smaller than the length of the receiving groove in the inner and outer directions.

14. The backrest structure according to claim 1, characterized in that: A guard plate and a plurality of reinforcing ribs are also arranged on the inner side of the side plate body. The guard plate is sleeved on the periphery of the receiving portion, and the plurality of reinforcing ribs are arranged in a staggered manner.

15. A piece of furniture, characterized in that: The invention comprises a seat frame structure, a pair of seat frame connectors and a backrest structure according to any one of claims 1 to 14, wherein the seat frame connectors connect the seat frame structure and the backrest structure.

16. The piece of furniture according to claim 15, characterized in that The seat frame connecting member includes a backrest connecting portion and a seat frame connecting portion. The backrest connecting portion is inserted into the receiving groove and snap-fitted with the connecting member mounting portion. The seat frame connecting portion is fixed to the seat frame structure.

17. The piece of furniture according to claim 16, characterized in that The backrest connecting portion is provided with a matching portion that is engaged with the connecting piece mounting portion, and the matching portion is an opening; or the matching portion is a hook groove that is recessed.

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