CN214156789U

CN214156789U - Backrest combined structure of assembled sofa

Info

Publication number: CN214156789U
Application number: CN202022582708.6U
Authority: CN
Inventors: 曹勇; 张敏; 夏军
Original assignee: Zoy Home Furnishing Co ltd
Current assignee: Zoy Home Furnishing Co ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-09-10
Anticipated expiration: 2030-11-10

Abstract

The utility model discloses a back integrated configuration of equipment sofa belongs to equipment sofa technical field. This scheme take with sofa base integrative back body frame and with the mode of the cushion skeleton of back body frame grafting, it is rational in infrastructure and stable to have, need not the instrument just can be by the artifical convenient, swiftly assemble and dismantle, the transportation of being convenient for, be convenient for change when the back spare part damages moreover.

Description

Backrest combined structure of assembled sofa

Technical Field

The utility model belongs to the technical field of the equipment sofa, a back integrated configuration is related to, especially, relate to a back integrated configuration of equipment sofa.

Background

The sofa is a chair with soft cushion, can be a single seat or a plurality of seats, is a backrest chair with springs or thick foam plastics and the like, has armrests on two sides, and is one kind of soft furniture. With the development of the sofa industry, the sofa plays an important role in the life of people, and people are used to sit on the sofa during leisure and entertainment. With the continuous improvement of living standard of people, the requirements of people on furniture are higher and higher, and the common sofa with single function is gradually abandoned by people. The existing function or the fixed sofa and the conjoined headrest float outwards, so that the package is damaged during transportation, the whole shape of the package cannot form a cuboid, and the transportation cost and the damage rate in the transportation process are increased.

Chinese utility model as the publication number is CN202751055U discloses a name is an adopt bow spring's plug-in type sofa, and it includes back and base, the back includes back frame and cushion, the base includes base frame and cushion, back and base are independent structure respectively, back frame lower part be equipped with two spliced poles, correspond base frame rear portion position department is equipped with the rectangular hole, the spliced pole inserts form sofa whole in the rectangular hole, including bow spring with interior lining material in cushion, the cushion, outsourcing fabric or leather are made. The utility model divides the sofa into a plurality of independent parts, each part has small volume, is convenient for transportation, saves space when loading, can greatly save transportation cost, and is very convenient when passing through a corridor and entering a door; the connecting column at the lower part of the backrest frame is directly inserted into the rectangular hole in the base frame, and the assembly and disassembly can be conveniently and quickly carried out by manpower without tools, thereby saving time and labor. However, the backrest frame of the backrest is integrally connected with the back cushion, but the back cushion is easily damaged by adopting a leather shell, so that the whole backrest needs to be replaced when the back cushion is dirty and broken, and the cost is higher; secondly, two connecting columns arranged at the lower part of the backrest frame are inserted into rectangular holes arranged at the rear part of the base frame, when the backrest is acted by the force of a user backrest, all force points are on the connecting columns, and thus the requirement on the strength of the connecting columns is high; and the long-term use of the sofa can cause the damage of the connecting column.

Still like the chinese utility model patent application document of publication number CN202312323U, disclose the name of a back sofa, it includes base, cushion and back subassembly, back subassembly and base pass through grafting structure swing joint, and the back subassembly includes the cushion and supports the bracket of cushion, and the bracket passes through grafting structure and base swing joint, grafting structure is including establishing the contact pin on the bracket bottom surface and establishing the jack of pegging graft with the contact pin pair on the base, the cushion back is equipped with the plug, and the bracket openly is equipped with the slot that matches with the plug. Because the utility model adopts the above technical scheme, back subassembly and base pass through grafting structure swing joint, and the base still is equipped with the cavity that is used for placing the back, has saved the space, is convenient for carry and remove, the cost that has significantly reduced. But establish the contact pin on the bracket bottom surface and establish the jack grafting on the base to and the back cushion back is equipped with the mode that the plug matches with the slot that the bracket openly was equipped with, and the structure list of itself of this scheme is thin and in the in-process of transportation and installation, and contact pin and plug are easily destroyed, thereby make the sofa not durable, life is not long.

SUMMERY OF THE UTILITY MODEL

The utility model discloses solve foretell technical problem, provide a back integrated configuration of equipment sofa, this scheme take with sofa base integrative back body frame and with the mode of the cushion skeleton that the back body frame was pegged graft has rational in infrastructure and stable, need not the instrument just can be by artifical convenient, swiftly assemble and dismantle, the transportation of being convenient for, be convenient for change when back spare part damages moreover.

The utility model provides an above-mentioned problem have adopted following technical scheme:

a backrest combined structure for assembling a sofa comprises a backrest main frame connected with a sofa base and a back cushion framework capable of being spliced with the front part of the backrest main frame;

the backrest main frame comprises two main frame main supporting plates which are parallel to each other and are vertically arranged, a cover plate which is connected with the tops of the two main frame main supporting plates and is perpendicular to the plane of the main frame main supporting plates, a plurality of main frame crosspieces which are fixed between the two main frame main supporting plates and are perpendicular to the plane of the main frame main supporting plates), and two fixing and mounting plates which are positioned between the two main frame main supporting plates and are close to one side of the cushion framework; the fixed mounting plate is provided with an inserting female part clamped with the back cushion framework;

the back cushion framework comprises an installation panel, and an insertion fitting used for being in insertion fit with the insertion female piece is arranged on the surface of the installation panel, which is close to one side of the backrest main frame.

Further preferably, an inner flitch is arranged on the main supporting plate of the main frame, and the inner flitch is contacted with the fixed mounting plate; clamping grooves for mounting the fixed mounting plates are formed in the edges, close to one side of the back cushion framework, of the two main support plates of the main frame; clamping protrusions corresponding to the clamping grooves are arranged on one side, close to the main supporting plate of the main frame, of the fixed mounting plate; the top end of the main support plate of the main frame is provided with a first limit bulge and a second limit notch for installing the cover plate; the edge that the apron with the body frame main tributary fagging meets is equipped with first spacing breach that first spacing protruding cooperation corresponds and with the spacing arch of second that the spacing breach corresponds.

Further preferably, the back cushion framework further comprises a framework frame and a reinforcing plate for reinforcing the framework frame and the mounting panel; the framework frame sequentially comprises a first wood board, a second wood board, a third wood board and a fourth wood board, wherein the first wood board and the third wood board are symmetrically arranged on two sides of the second wood board and the fourth wood board, and the second wood board and the fourth wood board are symmetrically arranged on two sides of the first wood board and the third wood board; the widths of the first wood board and the third wood board are larger than the widths of the second wood board and the fourth wood board; the surface of the second wood board close to one side of the backrest main frame is flush with the surface of the mounting panel close to one side of the backrest main frame; the reinforcing plate is positioned on the plane of the mounting panel, which is far away from the backrest main frame, and is close to the first wood plate and the third wood plate; the face that the installation panel is close to back body frame one side is the A face, be equipped with on the A face with be used for with the female spare grafting complex grafting accessory of pegging graft, the face that the installation panel was kept away from back body frame one side is the B face, the reinforcing plate on the B face set up the position with the grafting accessory on the A face set up the position corresponding just grafting accessory with the installation panel with the overlapping department of reinforcing plate corresponds.

Preferably, the inserting female element comprises a fixed plate, a first limit plate connected with one side of the fixed plate, and a second limit plate connected with the other side of the fixed plate; the edges of the first limiting plate and the second limiting plate are rolled inwards; the first limiting plate and the second limiting plate are symmetrically arranged on the basis of the fixing plate, and the included angle between the first limiting plate and the second limiting plate and the fixing plate is larger than 90 degrees.

Further preferably, the insertion female part corresponds to the insertion accessory structure; the upper end of the inserting female part is narrower than the lower end.

Preferably, the backrest combination structure further comprises a headrest framework rotationally connected with the back cushion framework and two rotational connecting pieces for rotationally connecting the back cushion framework and the headrest framework;

the headrest framework comprises two headrest main supporting plates, a headrest crosspiece, a headrest panel and a headrest bottom plate; the headrest bottom plate is fixed on one side, close to the backrest main frame, of the two headrest main supporting plates; the headrest panel is fixed on one side, away from the backrest main frame, of the headrest main supporting plate; a third limiting bulge and a third limiting notch are arranged on the main supporting plate; a fourth limiting notch corresponding to the third limiting protrusion and a fourth limiting protrusion corresponding to the third limiting notch are arranged on the edge of the headrest panel, which is in contact with the supporting plate;

the rotary connecting piece comprises a first fixed connecting plate and a second fixed connecting plate; the two first fixed connecting plates are fixed on the outer sides of the first wood board and the third wood board; the two second fixed connecting plates are fixed on the outer sides of the two supporting plates.

Further preferably, the backrest combination structure further comprises a backrest cushion mounted on the back cushion frame and a headrest cushion mounted on the headrest frame.

Further preferably, a headrest cushion mounting hole for mounting the headrest cushion is provided at a middle position of an edge of the headrest panel in contact with the support plate.

Further preferably, a backrest cushion mounting hole for mounting the backrest cushion is formed in the middle of the mounting panel.

Further preferably, the outer sides of the first wood board and the third wood board are provided with handrail grooves convenient for installation.

To sum up, the utility model has the advantages that:

1. the utility model realizes the free disassembly of the back cushion main frame through the matching of the arranged inserting female part and the inserting accessory between the back cushion main frame and the back cushion main frame, because the back cushion is generally made of softer leather material and is easy to damage, when the back cushion is damaged, only the back cushion main body and the back cushion main frame need to be separated and replaced by a new back cushion main body, and the replacement cost is lower and the effectiveness is high; meanwhile, the transportation and the installation are convenient to store independently during transportation, installation and disassembly, and the damage caused by collision is not easy to happen during the installation and the disassembly.

2. In the utility model, the main support plate of the main frame is also provided with an inner flitch which is contacted with the fixed mounting plate; clamping grooves for mounting the fixed mounting plates are formed in the edges, close to one side of the back cushion framework, of the two main support plates of the main frame; clamping protrusions corresponding to the clamping grooves are arranged on one side, close to the main supporting plate of the main frame, of the fixed mounting plate; the top end of the main support plate of the main frame is provided with a first limit bulge and a second limit notch for installing the cover plate; the edge that the apron with the body frame main tributary fagging meets is equipped with first spacing breach that first spacing protruding cooperation corresponds and with the spacing arch of second that the spacing breach corresponds. Make the back body frame rational in infrastructure and stable, when it continuously receives the power that the cushion body frame comes when using, its ability stability has longer life, and simple structure does not need to borrow the instrument simultaneously and just can install by manual work.

3. The utility model discloses a width of first plank, third plank is greater than the width of second plank, fourth plank, and the face that the second plank is close to back body frame one side is close to with the installation panel the face of back body frame one side flushes, and the reinforcing plate is located the installation panel and keeps away from the plane of back body frame, and is close to first plank and third plank. The main cushion frame is simple in structure, can be manually installed without using tools and is reasonable in structure; meanwhile, the matched inserting female part and the inserting accessory can be freely inserted or separated.

4. The utility model discloses in the female component of said grafting includes the fixed plate, the first limiting plate connected with one side of said fixed plate, the second limiting plate connected with another side of said fixed plate; the edges of the first limiting plate and the second limiting plate are rolled inwards; the first limiting plate and the second limiting plate are symmetrically arranged on the basis of the fixing plate, an included angle of the fixing plate is larger than 90 degrees, and the inserting female part corresponds to the inserting accessory structure. The upper end of the inserting female part is narrower than the lower end. Make the cooperation of pegging graft between back body frame and the cushion body frame, have simple to operate, firm advantage and because female spare of pegging graft and grafting accessory hardly receive except that the effect of female spare of pegging graft and grafting accessory looks block to external force, life is longer.

5. The backrest combination structure of the utility model also comprises a headrest framework rotationally connected with the back cushion framework and two rotational connecting pieces used for rotationally connecting the back cushion framework and the headrest framework; the headrest framework comprises two headrest main supporting plates, a headrest crosspiece, a headrest panel and a headrest bottom plate; the headrest bottom plate is fixed on one side, close to the backrest main frame, of the two headrest main supporting plates; the headrest panel is fixed on one side, away from the backrest main frame, of the headrest main supporting plate; a third limiting bulge and a third limiting notch are arranged on the main supporting plate; a fourth limiting notch corresponding to the third limiting protrusion and a fourth limiting protrusion corresponding to the third limiting notch are arranged on the edge of the headrest panel, which is in contact with the supporting plate; the rotary connecting piece comprises a first fixed connecting plate and a second fixed connecting plate; the two first fixed connecting plates are fixed on the outer sides of the first wood board and the third wood board; the two second fixed connecting plates are fixed on the outer sides of the two supporting plates. Make headrest framework and cushion skeleton rotate to be connected and stable in structure, the back has adjustable headrest, and the sofa is more comfortable when using, and the setting of adjustable headrest framework can make the length of cushion increase in order to deal with not crowd of co-altitude.

Drawings

FIG. 1 is a schematic view of the structure of a sofa backrest;

FIG. 2 is a schematic view of the rotational connection of the back cushion frame and the headrest frame;

FIG. 3 is a schematic structural view of the backrest frame;

fig. 4 is a schematic structural view of the plug female member and the plug fitting.

Reference numerals: 1. a backrest main frame; 2. a back cushion framework; 3. a headrest framework; 4. rotating the connecting piece; 11. the main support plate of the main frame; 11-1, a clamping groove; 11-2, a first limiting bulge; 11-3, a second limit notch; 12. a cover plate; 12-1, a first limit notch; 12-2, a second limiting bulge; 13. a main frame crosspiece; 14. fixing the mounting plate; 14-1, inserting female parts; 14-2, clamping protrusions; 14-1a, a fixing plate; 14-1b, a first limiting plate; 14-1c and a second limiting plate; 15. an inner pasting plate; 21. Installing a panel; 21-1, plug fittings; 21-2, backrest cushion mounting holes; 22. a skeletal frame; 23. a reinforcing plate; 22-1, a first wood board; 22-2, a second wood board; 22-3, a third wood board; 22-4, a fourth wood board; 31. a headrest main support plate; 31-1 and a third limiting bulge; 31-2 and a third limiting notch; 32. a headrest rail; 33. a headrest panel; 33-1 and a fourth limit notch; 33-2 and a fourth limiting bulge; 33-3, headrest cushion mounting holes; 34. a headrest base plate; 41. a first fixed connection plate; 42. and a second fixed connecting plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Examples

Referring to fig. 1, 2, 3 and 4, a backrest combination structure for assembling a sofa comprises a backrest main frame 1 connected with a sofa base and a cushion framework 2 capable of being inserted into the front part of the backrest main frame 1.

As shown in fig. 1 and 3, the backrest main frame 1 includes two main frame main support plates 11 that are parallel to each other and are vertically disposed, a cover plate 12 that is connected to tops of the two main frame main support plates 11 and is perpendicular to a plane of the main frame main support plates 11, four main frame crosspieces 13 that are fixed between the two main frame main support plates 11 and are perpendicular to the plane of the main frame main support plates 11, and two fixing and mounting plates 14 that are located between the two main frame main support plates 11 and are close to one side of the cushion frame 2. As shown in fig. 3, the fixed mounting plate 14 is provided with an insertion female member 14-1 which is clamped with the back cushion framework 2.

The cushion frame 2 shown in fig. 1 and 2 comprises a mounting panel 21, and the surface of the mounting panel 21 close to one side of the backrest main frame 1 is provided with an insertion fitting 21-1 for insertion fit with the insertion female member 14-1.

As shown in figure 3, the main support plate 11 of the main frame is also provided with an inner flitch 15, and the inner flitch 15 is contacted with the fixed mounting plate 14. The edges of the main supporting plates 11 of the main frame, which are close to one side of the back cushion framework 2, are provided with clamping grooves 11-1 for mounting the fixing and mounting plates 14; one side of the fixed mounting plate 14, which is close to the main supporting plate 11 of the main frame, is provided with a clamping protrusion 14-2 corresponding to the clamping groove 11-1; the top end of the main support plate 11 of the main frame is provided with a first limit bulge 11-2 and a second limit notch 11-3 for installing the cover plate 12. The edge of the cover plate 12 connected with the main support plate 11 of the main frame is provided with a first limit notch 12-1 corresponding to the first limit protrusion 11-2 in a matching way and a second limit protrusion 12-2 corresponding to the second limit notch 11-3.

The cushion frame 2 shown in fig. 1 and 2 further includes a frame 22 and a reinforcing plate 23 for reinforcing the frame 22 and the mounting panel 21; the skeleton frame 22 sequentially comprises a first wood board 22-1, a second wood board 22-2, a third wood board 22-3 and a fourth wood board 22-4, wherein the first wood board 22-1 and the third wood board 22-3 are symmetrically arranged on two sides of the second wood board 22-2 and the fourth wood board 22-4, and the second wood board 22-2 and the fourth wood board 22-4 are symmetrically arranged on two sides of the first wood board 22-1 and the third wood board 22-3; the widths of the first wood board 22-1 and the third wood board 22-3 are greater than the widths of the second wood board 22-2 and the fourth wood board 22-4; the surface of the second wood plate 22-2 adjacent to the backrest main frame 1 is flush with the surface of the mounting panel 21 adjacent to the backrest main frame 1. The reinforcement plate 23 is located in the plane of the mounting panel 21 away from the backrest main frame 1 as shown in fig. 1 and adjacent to the first and third planks 22-1 and 22-3; the surface of the installation panel 21 close to one side of the backrest main frame 1 is an A surface, an inserting fitting 21-1 which is used for being matched with the inserting female piece 14-1 in an inserting mode is arranged on the A surface, the surface of the installation panel 21 far away from one side of the backrest main frame 1 is a B surface, the arrangement position of the reinforcing plate 23 on the B surface corresponds to the arrangement position of the inserting fitting 21-1 on the A surface, and the inserting fitting 21-1 corresponds to the overlapping position of the installation panel 21 and the reinforcing plate 23.

As shown in fig. 4, the female plug-in member 14-1 includes a fixed plate 14-1a, a first stopper plate 14-1b connected to one side of the fixed plate 14-1a, and a second stopper plate 14-1c connected to the other side of the fixed plate 14-1 a; the edges of the first limit plate 14-1b and the second limit plate 14-1c are rolled inwards; the first limiting plate 14-1b and the second limiting plate 14-1c are symmetrically arranged based on the fixing plate 14-1a, and the included angle between the first limiting plate 14-1b and the fixing plate 14-1a is larger than 90 degrees. The plug female part 14-1 corresponds to the plug fitting 21-1 in structure; the female plug-in element 14-1 is shown as being narrower at its upper end than at its lower end. The female plug-in part 14-1 is identical in construction to the male plug-in part 21-1.

The backrest assembly structure shown in fig. 1 and 2 further includes a headrest frame 3 rotatably connected to the back cushion frame 2, and two rotary connecting members 4 for rotatably connecting the back cushion frame 2 and the headrest frame 3.

The headrest framework 3 comprises two headrest main support plates 31, a headrest crosspiece 32, a headrest panel 33 and a headrest bottom plate 34; the headrest bottom plate 34 is fixed on one side of the two headrest main support plates 31 close to the backrest main frame 1; the headrest panel 33 is fixed on one side of the headrest main support plate 31 far away from the backrest main frame 1; a third limiting bulge 31-1 and a third limiting notch 31-2 are arranged on the headrest main supporting plate 31; a fourth limiting notch 33-1 corresponding to the third limiting protrusion 31-1 and a fourth limiting protrusion 33-2 corresponding to the third limiting notch 31-2 are arranged on the edge of the headrest panel 33, which is in contact with the headrest main support plate 31;

wherein the rotary joint 4 is shown comprising a first fixed joint plate 41 and a second fixed joint plate 42; two first fixed attachment plates 41 are shown secured to the outside of the first 22-1 and third 22-3 planks; two second fixed attachment plates 42 are shown fixed to the outer sides of the two support plates 31.

The backrest combination structure further comprises a backrest cushion arranged on the back cushion framework 2 and a headrest cushion arranged on the headrest framework 3.

A headrest cushion mounting hole 33-2 for mounting the headrest cushion is provided at a middle position of an edge of the headrest panel 33 contacting the headrest support plate 31 as shown in fig. 1 and 2.

A backrest cushion mounting hole 21-2 for mounting the backrest cushion is provided at the middle of the mounting panel 21 as shown in fig. 1 and 2.

The outer sides of the first plank 22-1 and the third plank 22-3 as shown in fig. 1 and 3 are provided with handrail grooves for easy installation.

According to the technical scheme, a proofing worker firstly draws hole positions for placing the inserting female part 14-1 and the inserting fittings 21-1 on a template drawing of the fixed mounting plate 14 and the mounting panel 21, then issues the template, a frame engineer manufactures a frame according to the template drawing of the proofing worker, the template is cut after being issued, a nailer assembles the cut timber according to the template drawing and an assembling process drawing, and the inserting female part 14-1 of the rectangular fixed mounting plate 14 and the inserting fittings 21-1 of the mounting panel 21 are fixed in hole positions through screws to ensure the stability of the inserting female part 14-1 and the inserting fittings 21-1. When the whole sofa is assembled into a whole, the backrest main frame 1 and the back cushion framework 2 only need to be pressed downwards after the two pairs of inserting female parts 14-1 and the inserting fittings 21-1 are aligned by bayonets until the backrest main frame 1 and the back cushion framework 2 are well connected. When the sofa is disassembled, the back cushion framework 2 only needs to be slightly shaken to enable the bayonet between the inserting female part 14-1 and the inserting fitting part 21-1 to generate a gap, and the back cushion framework 1 and the back cushion framework 2 can be pulled out without complete contact and clamping. The operation is convenient and simple, and workers can easily learn the operation.

It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims

1. A backrest combined structure for assembling a sofa comprises a backrest main frame (1) connected with a sofa base and a cushion framework (2) which can be spliced with the front part of the backrest main frame (1); the method is characterized in that:

the backrest main frame (1) comprises two main frame main support plates (11) which are parallel to each other and are vertically arranged, a cover plate (12) which is connected with the tops of the two main frame main support plates (11) and is vertical to the plane of the main frame main support plates (11), a plurality of main frame crosspieces (13) which are fixed between the two main frame main support plates (11) and are vertical to the plane of the main frame main support plates (11), and two fixing and mounting plates (14) which are positioned between the two main frame main support plates (11) and are close to one side of the cushion framework (2); the fixed mounting plate (14) is provided with an inserting female part (14-1) clamped with the back cushion framework (2);

the back cushion framework (2) comprises an installation panel (21), and an insertion fitting (21-1) which is used for being in insertion fit with the insertion female piece (14-1) is arranged on the surface of one side, close to the backrest main frame (1), of the installation panel (21).

2. The backrest combination structure of assembled sofa as claimed in claim 1, wherein: an inner flitch (15) is further arranged on the main supporting plate (11) of the main frame, and the inner flitch (15) is in contact with the fixed mounting plate (14); clamping grooves (11-1) for mounting the fixing mounting plates (14) are formed in the edges, close to one side of the back cushion framework (2), of the two main support plates (11) of the main frame; one side of the fixed mounting plate (14) close to the main support plate (11) of the main frame is provided with a clamping protrusion (14-2) corresponding to the clamping groove (11-1); the top end of the main support plate (11) of the main frame is provided with a first limit bulge (11-2) and a second limit notch (11-3) for installing the cover plate (12); and a first limiting notch (12-1) corresponding to the first limiting protrusion (11-2) in a matching way and a second limiting protrusion (12-2) corresponding to the second limiting notch (11-3) in a matching way are arranged on the edge of the cover plate (12) connected with the main supporting plate (11) of the main frame.

3. The backrest combination structure of assembled sofa as claimed in claim 1, wherein: the cushion frame (2) further comprises a frame (22) and a reinforcing plate (23) for reinforcing the frame (22) and the mounting panel (21); the framework frame (22) sequentially comprises a first wood board (22-1), a second wood board (22-2), a third wood board (22-3) and a fourth wood board (22-4), wherein the first wood board (22-1) and the third wood board (22-3) are symmetrically arranged on two sides of the second wood board (22-2) and the fourth wood board (22-4), and the second wood board (22-2) and the fourth wood board (22-4) are symmetrically arranged on two sides of the first wood board (22-1) and the third wood board (22-3); the widths of the first wood board (22-1) and the third wood board (22-3) are larger than the widths of the second wood board (22-2) and the fourth wood board (22-4); the surface of one side, close to the backrest main frame (1), of the second wood board (22-2) is flush with the surface of one side, close to the backrest main frame (1), of the mounting panel (21); the reinforcing plate (23) is positioned on the plane of the mounting panel (21) far away from the backrest main frame (1) and close to the first wood plate (22-1) and the third wood plate (22-3); the face that installation panel (21) is close to back body frame (1) one side is the A face, be equipped with on the A face with be used for with female spare (14-1) grafting complex grafting accessory (21-1) of pegging graft, the face that installation panel (21) kept away from back body frame (1) one side is the B face, the set position of reinforcing plate (23) on the B face with the set position of grafting accessory (21-1) on the A face is corresponding just grafting accessory (21-1) with installation panel (21) with the department of overlapping of reinforcing plate (23) corresponds.

4. The backrest combination structure of assembled sofa as claimed in claim 1, wherein: the plug-in female element (14-1) comprises a fixed plate (14-1 a), a first limit plate (14-1 b) connected with one side of the fixed plate (14-1 a), and a second limit plate (14-1 c) connected with the other side of the fixed plate (14-1 a); the edges of the first limiting plate (14-1 b) and the second limiting plate (14-1 c) are rolled inwards; the first limiting plate (14-1 b) and the second limiting plate (14-1 c) are symmetrically arranged based on the fixing plate (14-1 a), and the included angle between the first limiting plate and the fixing plate (14-1 a) is larger than 90 degrees.

5. The backrest combination structure of assembled sofa as claimed in claim 1, wherein: the plug female part (14-1) corresponds to the plug accessory (21-1) in structure; the upper end of the inserting female part (14-1) is narrower than the lower end.

6. The backrest combination structure of assembled sofa as claimed in claim 3, wherein: the backrest combined structure also comprises a headrest framework (3) rotationally connected with the back cushion framework (2) and two rotational connecting pieces (4) used for rotationally connecting the back cushion framework (2) and the headrest framework (3);

the headrest framework (3) comprises two headrest main supporting plates (31), a headrest crosspiece (32), a headrest panel (33) and a headrest bottom plate (34); the headrest bottom plate (34) is fixed on one side of the two headrest main supporting plates (31) close to the backrest main frame (1); the headrest panel (33) is fixed on one side of the headrest main supporting plate (31) far away from the backrest main frame (1); a third limiting bulge (31-1) and a third limiting notch (31-2) are arranged on the headrest main supporting plate (31); a fourth limiting notch (33-1) corresponding to the third limiting protrusion (31-1) and a fourth limiting protrusion (33-2) corresponding to the third limiting notch (31-2) are arranged on the edge of the headrest panel (33) contacting the support plate (31);

the rotary connecting piece (4) comprises a first fixed connecting plate (41) and a second fixed connecting plate (42); the two first fixed connecting plates (41) are fixed on the outer sides of the first wood board (22-1) and the third wood board (22-3); the two second fixing connecting plates (42) are fixed on the outer sides of the two support plates (31).

7. The backrest combination structure of assembled sofa as claimed in claim 6, wherein: the backrest combined structure further comprises backrest cushions mounted on the back cushion framework (2) and headrest cushions mounted on the headrest framework (3).

8. The backrest combination structure of assembled sofa as claimed in claim 7, wherein: headrest cushion mounting holes (33-3) for mounting the headrest cushion are formed in the middle of the edge, which is in contact with the supporting plate (31), of the headrest panel (33).

9. The backrest combination structure of assembled sofa as claimed in claim 7, wherein: the middle part of the mounting panel (21) is provided with a backrest cushion mounting hole (21-2) for mounting the backrest cushion.

10. The backrest combination structure of assembled sofa as claimed in claim 3, wherein: handrail grooves convenient to mount are formed in the outer sides of the first wood board (22-1) and the third wood board (22-3).