Seat back structure

Abstract

The invention discloses a seat backrest structure, which relates to the technical field of seats, and comprises a backrest component, a backrest part and a backrest part, the connecting part comprises a fixing plate and an inserting part, and an inserting head is arranged at the end of the inserting part; the supporting framework comprises grab rails on the left side and the right side, grab rail inserting holes are formed in the rear ends of the grab rails, and grab rail lower side screw holes are formed in the lower sides of the grab rails; the butt joint piece comprises a butt joint rod on the front side and a butt joint cap on the rear side; the butt joint piece lower side screw is installed from the lower side of the grab rail to connect the connecting part, the supporting framework and the butt joint piece, the screw structure is not conspicuous, and the overall appearance effect is ensured; due to the fact that the butt-joint rods and the armrest rods are connected in the mode that the butt-joint rods are inserted into the armrest rod inserting holes, and the connecting parts on the two sides of the backrest part are connected in the mode that the armrest rods clamp the inserting heads, it can be guaranteed that the connection between the backrest main body structure and the armrest main body structure of the seat is durable enough.

Description

Technical Field

[0001] The invention relates to the technical field of seats, and in particular to a seat back structure. Background Art

[0002] For seats, such as office chairs, there will be backrests and armrests to improve comfort. In order to facilitate manufacturing, the backrest, armrests, seat panels and other components need to be manufactured separately and then assembled into a complete seat product. As for the backrest and the armrest, screws need to be inserted from the side of the armrest to connect with the backrest to achieve the fixation between the backrest and the armrest. This connection method not only exposes the screws in more conspicuous positions such as the upper side or side of the armrest, affecting the appearance, but also the connection of this structure relies on the fixation of screws, which is easy to cause the structure to fall apart due to loose screws during long-term work. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a seat back structure.

[0004] The seat back structure according to the embodiment of the present invention includes: a backrest plate; a connecting component connected to the backrest plate, the connecting component including a plug connector; an armrest rod, an armrest rod plug-in hole is provided at the rear end of the armrest rod, and an armrest rod lower side screw hole is provided at the lower side of the armrest rod; a docking component, the docking component includes a front docking rod, the docking rod is plugged into the armrest rod plug-in hole, a docking groove is provided on the side wall of the docking component, the plug connector is plugged into the docking groove, the hole wall of the armrest rod plug-in hole covers the docking groove, and the hole wall of the armrest rod plug-in hole clamps the plug connector, the docking rod is provided with a docking component lower side screw hole at the lower side, and the docking component lower side screw passes through the armrest rod lower side screw hole and the docking component lower side screw hole in sequence from the lower side.

[0005] According to some embodiments of the present invention, a backrest component and a support frame are further included, wherein the backrest component includes a front seat plate and a rear backrest plate, and the support frame includes left and right armrests and a middle support beam, wherein the upper side of the support beam supports the lower side of the seat plate.

[0006] According to some embodiments of the present invention, the support frame further includes a support pole and a tripod, the upper side of the support pole is connected to the handrail pole, and the lower side of the support pole is connected to the tripod.

[0007] According to some embodiments of the present invention, the connecting component also includes a fixed plate, the fixed plate includes a fixed back plate and a fixed side plate, the fixed back plate and the fixed side plate form an "L"-shaped structure, the fixed back plate is connected to the rear wall position of the backrest plate, the fixed side plate is connected to the side wall position of the backrest plate, and the plug connector is connected to the fixed side plate.

[0008] According to some embodiments of the present invention, a rear screw hole of a connecting component is provided on the fixed back plate, and a rear side screw of the connecting component passes through the rear screw hole of the connecting component to be connected to the rear side of the backrest plate, and a side screw hole of a connecting component is provided on the plug connector, and a side screw of the connecting component passes through the side screw hole of the connecting component to be connected to the side of the backrest plate.

[0009] According to some embodiments of the present invention, the docking member includes the docking rod on the front side and the docking cap on the rear side, a step convex surface is provided between the docking rod and the docking cap, and the step convex surface supports the rear end of the handrail rod.

[0010] According to some embodiments of the present invention, the docking rod is inserted into the handrail rod insertion hole, a docking groove is provided on the side wall of the docking piece, the docking groove includes a front section of the docking groove corresponding to the position of the docking rod and a rear section of the docking groove corresponding to the position of the docking cap, the connecting component includes a plug-in portion, the plug-in connector is located at the end of the plug-in portion, the plug-in portion is inserted into the rear section of the docking groove, and the rear end of the handrail rod supports the plug-in portion.

[0011] According to some embodiments of the present invention, a plug connector screw hole is provided on the lower side of the plug connector, and the lower screw of the docking piece passes through the lower screw hole of the handrail rod, the lower screw hole of the docking piece and the plug connector screw hole in sequence from the lower side.

[0012] According to some embodiments of the present invention, the plug connector is a horizontal columnar structure, and the horizontal columnar structure extends along the front and rear directions.

[0013] According to some embodiments of the present invention, the docking member further includes a docking crossbeam, and the docking rods on both sides are connected together by the docking crossbeam.

[0014] The seat back structure according to the embodiment of the present invention has at least the following technical effects: the screws on the lower side of the docking piece are installed from the lower side of the armrest rod to connect the connecting component, the supporting frame and the docking piece, and the screw structure is inconspicuous, ensuring the overall appearance effect; because the docking rod and the armrest rod are connected by being plugged into the armrest rod plug hole, and the connecting components on both sides of the backrest component are connected by clamping the plug connector of the armrest rod, the screws on the lower side of the docking piece only need to ensure that the docking rod and the armrest rod are not misaligned, and do not need to bear a lot of force to ensure a firm connection between the backboard and the armrest rod, thereby ensuring that the connection between the main structure of the seat back and the main structure of the armrest is durable enough.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a three-dimensional diagram of the seat back structure of the present invention; Figure 2 is a three-dimensional view of the seat back structure of the present invention from another angle; Figure 3 is a structural exploded view of the seat back structure of the present invention; Figure 4 is a three-dimensional diagram of the connecting component in the present invention; Figure 5 is a three-dimensional diagram of the docking piece in the present invention; Figure 6 yes Figure 5 A magnified image of area A; Figure 7 is a three-dimensional diagram of a backrest component in the present invention; Figure 8 is a three-dimensional diagram of the support frame of the present invention; Fig. 9 It is a schematic diagram of the connection principle of the present invention.

[0016] Reference numerals: Backrest component 100, backrest plate 110, seat plate 120; connecting component 200, fixed plate 210, fixed back plate 211, fixed side plate 212, connecting component rear screw hole 213, plug-in portion 220, plug connector 230, connecting component side screw hole 231, plug connector screw hole 232; supporting frame 300, handrail rod 310, handrail rod plug-in hole 311, handrail rod lower side screw hole 312, supporting crossbeam 320, supporting vertical rod 330, footrest 340; docking component 400, docking rod 410, docking component lower side screw hole 411, docking groove plug-in hole 412, docking cap 420, step convex surface 421, docking groove 430, docking groove front section 431, docking groove rear section 432, clamping edge 433, docking crossbeam 440; docking component lower side screw 510, connecting component rear side screw 520, connecting component side screw 530. DETAILED DESCRIPTION

[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0018] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] In the description of the present invention, the meaning of "more than" is "more than", and "greater than", "less than", "exceed" etc. are understood to exclude the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0020] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0021] Reference below Figure 1 and Figure 2 A seat back structure according to an embodiment of the present invention is described.

[0022] like Figure 1 and Figure 2As shown, the seat back structure according to the embodiment of the present invention includes a backrest board 110 , a connecting component 200 , an armrest rod 310 and a docking component 400 .

[0023] Reference Figure 3 , Figure 4 , backrest plate 110; connecting component 200, connected to the backrest plate 110, connecting component 200 includes a plug connector 230; handrail rod 310, handrail rod plug hole 311 is provided at the rear end of handrail rod 310, and handrail rod lower side screw hole 312 is provided at the lower side of handrail rod 310; docking member 400, docking member 400 includes a front docking rod 410, docking rod 410 is plugged into handrail rod plug hole 311, docking groove 430 is provided on the side wall of docking member 400, plug connector 230 is plugged into docking groove 430, the hole wall of handrail rod plug hole 311 covers the docking groove 430, and the hole wall of handrail rod plug hole 311 clamps the plug connector 230, docking rod 410 is provided with docking member lower side screw hole 411 at the lower side, docking member lower side screw 510 passes through handrail rod lower side screw hole 312 and docking member lower side screw hole 411 from the lower side in sequence.

[0024] For example, Figure 1 and Figure 2 As shown, the backrest component 100 includes a backrest board 110 at the rear side, which serves as the main structure of the backrest of the chair of the present invention. Two connecting components 200 are respectively located on the left and right sides of the backrest board 110, and the connecting components 200 are fixed on the backrest board 110. The connecting component 200 includes a plug-in portion 220, and a plug connector 230 is provided at the end of the plug-in portion 220. The support frame 300 includes left and right handrails 310, which serve as the main structure of the armrest of the chair of the present invention. The rear end of the handrail 310 is provided with a handrail plug-in hole 311, and the lower side of the handrail 310 is provided with a handrail lower side screw hole 312. The docking component 400 includes a docking rod 410 on the front side and a docking cap 420 on the rear side. The docking rod 410 is inserted into the armrest rod plug-in hole 311. A docking groove 430 is provided on the side wall of the docking component 400. The plug-in part 220 is inserted into the docking groove 430. The rear end of the armrest rod 310 covers the docking groove 430 and clamps the plug-in connector 230. A docking component lower side screw hole 411 is provided on the lower side of the docking rod 410. The docking component lower side screw 510 passes through the armrest rod lower side screw hole 312 and the docking component lower side screw hole 411 from the lower side in sequence to realize the connection between the backrest component 100, the connecting component 200 and the support frame 300.

[0025] In actual production, the backrest component 100, the connecting component 200, the supporting frame 300 and the docking component 400 are produced separately, and then the connecting component 200 is first installed on the backrest component 100, and connected to the backrest plate 110 on the backrest component 100 through the fixing plate 210 on the connecting component 200.

[0026] Reference Fig. 9 Then, the plug connector 230 on the connecting component 200 is inserted into the docking groove 430 on the docking component 400, and then the docking rod 410 on the docking component 400 is inserted into the handrail rod 310. When the docking rod 410 is plugged in, the plug connector 230 is in the docking groove 430, and the side wall of the handrail rod 310 can also clamp the plug connector 230. Finally, the lower side screw 510 of the docking component is inserted from the lower side to connect the lower side screw hole 312 of the handrail rod and the lower side screw hole 411 of the docking component, and the backrest board 110 and the handrail rod 310 are firmly connected together.

[0027] In the above installation method, the lower screw 510 of the docking piece is installed from the lower side of the handrail rod 310, so it is not conspicuous, ensuring the overall appearance effect. In addition, since the docking rod 410 and the handrail rod 310 are connected by plugging into the handrail rod plug hole 311, and the connecting parts 200 on both sides of the backrest component 100 are connected by clamping the plug connector 230 of the handrail rod 310, the lower screw 510 of the docking piece only needs to ensure that the docking rod 410 and the handrail rod 310 are not misaligned, and does not need to bear a lot of force to ensure the stable connection between the backrest board 110 and the handrail rod 310, which can ensure that the connection between the backrest main structure and the armrest main structure of the chair of the present invention is durable enough.

[0028] In some embodiments of the present invention, the armrest rod 310 extends along the front-rear direction, and each plug-in portion 220 extends horizontally to the left and right sides of the backrest board 110 respectively.

[0029] In some embodiments of the present invention, reference Figure 2 , Figure 7 The chair of the present invention further comprises a backrest component 100 and a support frame 300. The backrest component 100 comprises a front seat plate 120 and a rear backrest plate 110. The support frame 300 comprises left and right handrails 310 and a middle support beam 320. The upper side of the support beam 320 supports the lower side of the seat plate 120. The seat plate 120 serves as the seat plate structure of the chair of the present invention. The upper side of the support beam 320 supports the lower side of the seat plate 120 to ensure that the seat plate structure of the chair of the present invention is sufficiently stable.

[0030] In a further embodiment of the present invention, the lower side of the support beam 320 is connected to the lower side of the seat plate 120 by mounting screws.

[0031] In some embodiments of the present invention, reference Figure 3 , Figure 8 The support frame 300 also includes a support pole 330 and a tripod 340. The upper side of the support pole 330 is connected to the handrail 310, and the lower side of the support pole 330 is connected to the tripod 340, so that the handrail 310, the support pole 330, and the tripod 340 are sufficiently stable as an integrated structure.

[0032] In some specific embodiments of the present invention, the handrail 310, the support pole 330, and the footrest 340 are made by bending steel pipes.

[0033] In some specific embodiments of the present invention, the upper side of the support rod 330 is connected to the front end of the handrail rod 310 , and the lower side of the support rod 330 is connected to the front side of the tripod 340 .

[0034] In some embodiments of the present invention, reference Figure 3 , Figure 4 , the connecting component 200 is connected to the backrest plate 110 through the fixing plate 210 .

[0035] In some embodiments of the present invention, the connecting component 200 includes a fixed plate 210, and the fixed plate 210 includes a fixed back plate 211 and a fixed side plate 212. The fixed back plate 211 and the fixed side plate 212 form an "L"-shaped structure. The fixed back plate 211 is connected to the rear wall of the backrest plate 110, and the fixed side plate 212 is connected to the side wall of the backrest plate 110. The plug connector 230 is connected to the fixed side plate 212 to ensure that the fixed plate 210 is firmly connected to the backrest plate 110.

[0036] In some embodiments of the present invention, a connecting component rear screw hole 213 is provided on the fixed back plate 211, and a connecting component rear side screw 520 passes through the connecting component rear screw hole 213 to be connected to the rear side of the backrest plate 110, and a connecting component side screw hole 231 is provided on the plug connector 230, and the connecting component side screw 530 passes through the connecting component side screw hole 231 to be connected to the side of the backrest plate 110, so as to facilitate the disassembly and assembly of the fixed plate 210 and the backrest plate 110.

[0037] In some embodiments of the present invention, the docking component 400 includes a docking rod 410 on the front side and a docking cap 420 on the rear side. A step convex surface 421 is provided between the docking rod 410 and the docking cap 420. The step convex surface 421 supports the rear end of the handrail rod 310. In this way, when the docking component 400 is inserted into the handrail rod 310, the step convex surface 421 can be limited between the docking rod 410 and the handrail rod insertion hole 311, ensuring that the docking component 400 is installed more securely.

[0038] In some embodiments of the present invention, reference Figure 5 , Figure 6The docking rod 410 is inserted into the handrail rod insertion hole 311, and a docking groove 430 is provided on the side wall of the docking member 400. The docking groove 430 includes a docking groove front section 431 corresponding to the position of the docking rod 410 and a docking groove rear section 432 corresponding to the position of the docking cap 420. The connecting component 200 includes a plug-in portion 220, and the plug connector 230 is located at the end of the plug-in portion 220. The plug-in portion 220 is inserted into the docking groove rear section 432, and the rear end of the handrail rod 310 supports the plug-in portion 220. After the plug connector 230 on the connecting component 200 is inserted into the docking groove 430 on the docking member 400, the docking rod 410 on the docking member 400 is then inserted into the handrail rod insertion hole 311 of the handrail rod 310. When the docking rod 410 is inserted into the handrail rod insertion hole 311, the plug connector 230 is in the docking groove 430, and because the rear end of the handrail rod 310 covers the front section 431 of the docking groove, the side wall of the handrail rod 310 can also clamp the plug connector 230, and at this time the plug part 220 passes through the rear section 432 of the docking groove. Finally, the lower side screw 510 of the docking piece is inserted from the lower side to connect the lower side screw hole 312 of the handrail rod and the lower side screw hole 411 of the docking piece, and the backrest board 110 and the handrail rod 310 are firmly connected together.

[0039] In some embodiments of the present invention, the front end of the docking slot front section 431 extends to the front end surface of the docking rod 410 to form a docking slot plug hole 412, and the docking slot 430 has a clamping edge 433, which can clamp the plug connector 230. In this way, the plug connector 230 on the connecting component 200 can be inserted into the docking slot 430 from the docking slot plug hole 412 and slide along the direction of the docking slot 430 until the plug-in portion 220 is aligned with the docking slot front section 431.

[0040] In some embodiments of the present invention, reference Figure 4 A plug connector screw hole 232 is provided on the lower side of the plug connector 230, and the lower side screw 510 of the docking piece passes through the lower side screw hole 312 of the handrail rod, the lower side screw hole 411 of the docking piece and the plug connector screw hole 232 from the lower side in sequence, ensuring that the handrail rod 310, the docking rod 410 and the connecting component 200 are more firmly connected.

[0041] In some embodiments of the present invention, the plug connector 230 is a horizontal columnar structure, which extends along the front and rear directions to ensure that after the connecting component 200 is connected to the backrest component 100 and the support frame 300, it can provide more reliable support for the backrest board 110.

[0042] In some specific embodiments of the present invention, the front section 431 of the docking slot corresponds to the front end position of the horizontal columnar structure, and a rear plug hole is provided on the rear side of the rear section 432 of the docking slot, and the rear end of the horizontal columnar structure is inserted into the rear plug hole, so that the plug connector 230 is more stable in the docking slot 430.

[0043] In some embodiments of the present invention, the docking member 400 further includes a docking crossbeam 440, and the docking rods 410 on both sides are connected together by the docking crossbeam 440, that is, the docking member 400 is docked and installed with the handrail rods 310 on both sides as a part, thereby improving the installation effect. Moreover, the docking crossbeam 440 can also be used as an external decorative structure to cover the connecting component 200, thereby improving the appearance effect of the seat of the present invention.

[0044] The furniture chair according to the second embodiment of the present invention comprises the seat back structure according to the first embodiment of the present invention.

[0045] An office chair according to an embodiment of a third aspect of the present invention comprises a seat back structure according to an embodiment of the first aspect of the present invention.

[0046] The seat according to the embodiment of the present invention simplifies the installation of the seat by adopting the seat back structure, facilitates the compact structural design of the seat, improves the structural stability of the seat, and enhances the user experience.

[0047] Other structures and operations of the seat according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0048] Reference below Figure 1 and Figure 2 The seat back structure according to the embodiment of the present invention is described in detail with a specific embodiment. It is worth noting that the following description is only for illustrative purposes and is not a specific limitation of the present invention.

[0049] like Figure 1 and Figure 2 As shown, the seat back structure according to the embodiment of the present invention includes a backrest component 100 , a connecting component 200 , a supporting frame 300 and a docking component 400 .

[0050] The backrest component 100 includes a backrest plate 110 and a seat plate 120. The connecting component 200 is located on the left and right sides of the backrest plate 110. The connecting component 200 includes a fixing plate 210, a plug-in portion 220, and a plug connector 230. The fixing plate 210 is provided with a fixing back plate 211, a fixing side plate 212, and a connecting component rear screw hole 213. The plug connector 230 is provided with a connecting component side screw hole 231 and a plug connector screw hole 232. The connecting component rear side screw 520 passes through the connecting component rear screw hole 213 to connect with the backrest plate 110 rear side, and the connecting component side screw 530 passes through the connecting component side screw hole 231 to connect with the side of the backrest plate 110, so as to realize the connection between the fixing plate 210 and the backrest plate 110.

[0051] The support frame 300 includes a handrail bar 310, a support beam 320, a support vertical bar 330, and a foot frame 340. The handrail bar 310 is provided with a handrail bar plug-in hole 311 and a handrail bar lower side screw hole 312.

[0052] The docking member 400 includes a docking rod 410, a docking cap 420, a stepped convex surface 421, a docking groove 430, and a docking crossbeam 440. The docking rod 410 includes a lower screw hole 411 of the docking member and a docking groove plug hole 412. The docking groove 430 is provided with a docking groove front section 431, a docking groove rear section 432, and a clamping edge 433. The lower screw 510 of the docking member passes through the lower screw hole 312 of the handrail rod, the lower screw hole 411 of the docking member, and the plug screw hole 232 from the lower side in sequence, ensuring that the handrail rod 310, the docking rod 410 and the connecting component 200 are more firmly connected.

[0053] The seat back structure according to the embodiment of the present invention can achieve at least the following effects by being arranged in this way: the lower side screw 510 of the docking piece is installed from the lower side of the armrest rod 310 to connect the connecting component 200, the support frame 300 and the docking piece 400, and the screw structure is not conspicuous, ensuring the overall appearance effect; since the docking rod 410 and the armrest rod 310 are connected by being plugged into the armrest rod plug hole 311, and the connecting components 200 on both sides of the backrest component 100 are connected by being clamped in the plug connector 230 by the armrest rod 310, the lower side screw 510 of the docking piece only needs to ensure that the docking rod 410 and the armrest rod 310 are not misaligned, and it does not need to bear a lot of force to ensure the stable connection between the backboard 110 and the armrest rod 310, so as to ensure that the connection between the backrest main structure and the armrest main structure of the seat of the present invention is durable enough.

[0054] In the description of this specification, the description with reference to the terms "some embodiments" or "it is conceivable that" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A seat back structure, characterized in that: include: Backrest plate (110); A connecting component (200) connected to the backrest plate (110), the connecting component (200) comprising a plug connector (230); A handrail (310), wherein a handrail insertion hole (311) is provided at the rear end of the handrail (310), and a handrail lower side screw hole (312) is provided at the lower side of the handrail (310); A docking piece (400), the docking piece (400) comprising a docking rod (410) on the front side, the docking rod (410) being inserted into the handrail rod plug hole (311), a docking groove (430) being provided on the side wall of the docking piece (400), the plug connector (230) being inserted into the docking groove (430), the hole wall of the handrail rod plug hole (311) covering the docking groove (430), and the hole wall of the handrail rod plug hole (311) clamping the plug connector (230), a docking piece lower side screw hole (411) being provided on the lower side of the docking rod (410), and a docking piece lower side screw (510) passing through the handrail rod lower side screw hole (312) and the docking piece lower side screw hole (411) in sequence from the lower side.

2. The seat back structure according to claim 1, characterized in that: It also includes a backrest component (100) and a support frame (300), wherein the backrest component (100) includes a front seat plate (120) and a rear backrest plate (110), and the support frame (300) includes left and right handrails (310) and a middle support beam (320), wherein the upper side of the support beam (320) supports the lower side of the seat plate (120).

3. The seat back structure according to claim 2, characterized in that: The support frame (300) further comprises a support pole (330) and a foot frame (340); the upper side of the support pole (330) is connected to the handrail pole (310), and the lower side of the support pole (330) is connected to the foot frame (340).

4. The seat back structure according to claim 1, characterized in that: The connecting component (200) further comprises a fixed plate (210), the fixed plate (210) comprising a fixed back plate (211) and a fixed side plate (212), the fixed back plate (211) and the fixed side plate (212) forming an "L"-shaped structure, the fixed back plate (211) being connected to a rear wall of the backrest plate (110), the fixed side plate (212) being connected to a side wall of the backrest plate (110), and the plug connector (230) being connected to the fixed side plate (212).

5. The seat back structure according to claim 4, characterized in that: The fixed back plate (211) is provided with a connecting component rear screw hole (213), and the connecting component rear side screw (520) passes through the connecting component rear screw hole (213) to be connected to the rear side of the backrest plate (110); the plug connector (230) is provided with a connecting component side screw hole (231), and the connecting component side screw (530) passes through the connecting component side screw hole (231) to be connected to the side of the backrest plate (110).

6. The seat back structure according to claim 1, characterized in that: The docking member (400) comprises the docking rod (410) at the front side and a docking cap (420) at the rear side, a stepped convex surface (421) is provided between the docking rod (410) and the docking cap (420), and the stepped convex surface (421) supports the rear end of the handrail rod (310).

7. The seat back structure according to claim 6, characterized in that: The docking rod (410) is inserted into the handrail rod insertion hole (311); a docking groove (430) is provided on the side wall of the docking member (400); the docking groove (430) comprises a docking groove front section (431) corresponding to the position of the docking rod (410) and a docking groove rear section (432) corresponding to the position of the docking cap (420); the connecting component (200) comprises a plug-in portion (220); the plug-in head (230) is located at the end of the plug-in portion (220); the plug-in portion (220) is inserted into the docking groove rear section (432); and the rear end of the handrail rod (310) abuts against the plug-in portion (220).

8. The seat back structure according to claim 1, characterized in that: A plug connector screw hole (232) is provided at the lower side of the plug connector (230), and the lower side screw (510) of the docking piece passes through the lower side screw hole (312) of the handrail rod, the lower side screw hole (411) of the docking piece, and the plug connector screw hole (232) in sequence from the lower side.

9. The seat back structure according to claim 1, characterized in that: The plug connector (230) is a horizontal columnar structure, and the horizontal columnar structure extends along the front and rear directions.

10. The seat back structure according to claim 1, characterized in that: The docking member (400) further comprises a docking crossbeam (440), and the docking rods (410) on both sides are connected together via the docking crossbeam (440).

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