Assembly method and assembly tool for split chair back

Abstract

The present invention discloses an assembly method and assembly tool for a split chair back, which is used for assembling a split chair back, wherein the split chair back comprises a chair back frame, a backrest frame, a lumbar support frame and a lumbar support plate, the chair back frame and the backrest frame are fixed, one end of the lumbar support plate is fixed to the chair back frame or the backrest frame, and the other end of the lumbar support plate is fixed to the lumbar support frame, and the lumbar support frame is hinged to the backrest frame, wherein the chair back frame, the backrest frame and the lumbar support plate fixed together are stably placed on the assembly tool, and then after the lumbar support frame and the lumbar support plate are fixed, the lumbar support frame is pressed down so that the hinge hole of the lumbar support frame and the hinge hole of the backrest frame remain coaxial, and then the hinge ring is inserted into the hinge hole of the lumbar support frame and the hinge hole of the backrest frame to complete the assembly of the split chair back; in this way, the assembly of the chair back can be easily completed by one person, so that the assembly efficiency and assembly accuracy of the split chair back are greatly improved.

Description

Technical Field

[0001] The invention relates to the field of seating, and in particular to an assembling method of a split chair back. Background Art

[0002] As we all know, the human spine is S-shaped. If you sit in an incorrect posture for a long time or the chair structure is unreasonable, it will cause serious lumbar spine diseases. Therefore, lumbar support is an important component of office chairs. The lumbar support can support the human lumbar spine and effectively relieve the pressure on the user's waist.

[0003] Patent document with publication number CN214760163U discloses a chair back assembly, including a chair back, a lumbar support and a chair back frame, wherein the chair back frame is connected to the bottom of the chair back, and the upper part of the lumbar support is movably connected to the chair back or the chair back frame. It also includes a support member arranged between the chair back and the lumbar support, and the support member is an S-shaped elastic support member. The upper part of the support member is fixedly connected to the chair back or the chair back frame, and the lower part of the support member is connected to the lower part of the lumbar support. The upper part of the lumbar support is hinged to the chair back or the chair back frame.

[0004] In the prior art, since the upper part of the lumbar support needs to be hinged to the chair back or the chair back frame through a hinge shaft, the hinge shaft must be tightly fitted with the chair back or the chair back frame. Since the lumbar support needs to achieve the purpose of elastic support, it is required that the lumbar support itself is in a bent state after being installed on the chair back. The existing installation method of the lumbar support is to manually position and connect the lumbar support with the support member and the chair back. However, this method makes it difficult for one person to complete the assembly of the lumbar support. The process is time-consuming and labor-intensive, and the assembly accuracy is low, and the assembly efficiency is even lower. Summary of the Invention

[0005] In order to solve the problems in the prior art, the purpose of the present invention is to provide a method for assembling a split chair back, which can be easily completed by a single person, thereby greatly improving the assembly efficiency and assembly accuracy of the split chair back.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] The assembling method of a split chair back is used to assemble a split chair back, wherein the split chair back includes a chair back frame, a backrest frame, a lumbar support frame and a lumbar support plate, the rear portion of the backrest frame is fixed to the front end of the chair back frame, the lumbar support plate is located at the rear side of the backrest frame, the front portion of the lumbar support plate is fixed to the chair back frame, the rear portion of the lumbar support plate is fixed to the rear portion of the lumbar support frame, the front portion of the lumbar support frame is hinged to the rear portion of the backrest frame, wherein a first connecting portion is protruded backward on the backrest frame, the front portion of the chair back frame is fixedly connected to the lower portion of the first connecting portion, and the first portion of the backrest frame is fixedly connected to the lower portion of the first connecting portion. The upper part of the connecting part is provided with a movable groove, the upper part of the first connecting part is protruded with two hinge parts, the two hinge parts are located on both sides of the movable groove, and the two hinge parts are provided with a first hinge hole that runs horizontally through the body thereof, the front part of the lumbar support frame is protruded downward with a second connecting part, the second connecting part is provided with a second hinge hole, the second connecting part is inserted into the movable groove, the second connecting part is not connected to any part in the movable groove, and the hinge shaft passes through the first hinge hole and the second hinge hole to hinge the backrest frame and the lumbar support frame; the installation method of the split chair back is as follows:

[0008] Step 1) After fixing the chair back frame, backrest frame and lumbar support plate, place them horizontally in the positioning space on the workbench;

[0009] Among them, the positioning space matches the backrest frame and the chair back frame assembled together;

[0010] Step 2) Install the lumbar support plate and the lumbar support frame, and press the lumbar support frame downward with the positioning hook installed on the workbench, so that the first hinge hole on the lumbar support frame and the second hinge hole on the lumbar support frame are coaxial;

[0011] Step 3) Insert the hinge shaft into the second hinge hole of the chair back frame and the first hinge hole of the lumbar support frame from the side of the chair back frame to hinge the lumbar support frame and the backrest frame; Step 4) Take out the chair back frame, backrest frame, lumbar support frame and lumbar support plate that are installed together.

[0012] Preferably, the positioning space is enclosed by a first positioning seat, a second positioning seat, two third positioning seats and two fourth positioning seats.

[0013] Preferably, the first positioning seat, the two third positioning seats and the two fourth positioning seats are all wedge-shaped.

[0014] Preferably, the first positioning seat, the second positioning seat, the two third positioning seats and the two fourth positioning seats are all slidably mounted on the workbench.

[0015] Preferably, a positioning cylinder is installed on the workbench, and the positioning hook is installed on the positioning cylinder.

[0016] Preferably, there are two positioning hooks, and the chair back frame is located between the two positioning hooks.

[0017] Preferably, the positioning hook is hinged to the telescopic end of the positioning cylinder.

[0018] Preferably, a push cylinder is installed on the workbench, and the telescopic end of the push cylinder faces the first hinge hole on the chair back frame.

[0019] Preferably, the push cylinder is installed on the workbench in a liftable manner.

[0020] An assembly tool is provided, which is applied to the assembly method of the split chair back.

[0021] The beneficial effects of the technical solution of the present invention are as follows: the existing installation method of the split chair back requires one person to press and bend the lumbar frame with force so that the second connecting portion of the lumbar frame is inserted into the movable groove of the backrest frame, and the second hinge hole of the lumbar frame and the first hinge hole of the backrest frame must be coaxial, and the hinge shaft must be tightly fitted with the backrest frame. This makes the split chair back very difficult to assemble, not only requiring two people to cooperate with each other, but also difficult to control the amount of force applied during the bending of the lumbar frame, making it difficult to ensure that the first hinge hole and the second hinge hole are always coaxial during the assembly process, and the insertion of the hinge shaft is also laborious. However, through the above method, one person can easily and quickly complete the assembly of the split chair back, greatly saving assembly time, improving assembly efficiency, and greatly improving the assembly accuracy of the split chair back. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of a split chair back;

[0023] Figure 2 It is a structural diagram of the split chair back on the assembly tool;

[0024] Figure 3 It is a structural diagram of the assembly tool;

[0025] Figure 4 Schematic diagram of the structure of the chair back frame;

[0026] Figure 5 It is a structural diagram of the lumbar support frame;

[0027] Figure 6 It is a structural diagram of the backrest frame.

[0028] Reference numerals: 1, workbench; 12, first sliding hole; 13, second sliding hole; 14, third sliding hole; 15, fourth sliding hole; 16, avoidance groove; 2, first positioning seat; 3, second positioning seat; 31, pressure plate; 4, third positioning seat; 5, fourth positioning seat; 61, positioning cylinder; 62, mounting seat; 63, positioning hook; 64, height limiter; 65, push cylinder;

[0029] 7. Chair back frame, 8. Backrest frame; 81. First connecting part; 82. Movable groove; 83. Hinge part; 84. First hinge hole; 9. Lumbar support frame; 91. Second connecting part; 92. Second hinge hole; 10. Lumbar support plate. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail, 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 intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships 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, rather than indicating or implying 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 limiting the present invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise explicitly specified.

[0033] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0035] The orientations described in the following embodiments are Figure 1 The directions shown are subject to Figure 1 The position of the first positioning seat is the front, the position of the second positioning seat is the back, and the left and right are discussed in terms of front and back.

[0036] Example 1

[0037] A method for assembling a split chair back is used to assemble a split chair back, wherein the split chair back includes a chair back frame 7, a backrest frame 8, a lumbar support frame 9 and a lumbar support plate 10, the rear portion of the backrest frame 8 is fixed to the front end of the chair back frame 7, the lumbar support plate 10 is located on the rear side of the backrest frame 8, the front portion of the lumbar support plate 10 is fixed to the chair back frame 7, the rear portion of the lumbar support plate 10 is fixed to the rear portion of the lumbar support frame 9, the front portion of the lumbar support frame 9 is hinged to the rear portion of the backrest frame 8, wherein the backrest frame 8 has a first connecting portion 81 protruding backward and forward, the front portion of the chair back frame 7 is fixedly connected to the lower portion of the first connecting portion 81, and the backrest frame A movable groove 82 is provided on the upper part of the first connecting portion 81 of the backrest 8. Two hinged portions 83 are protruded from the upper part of the first connecting portion 81. The two hinged portions 83 are located on both sides of the movable groove 82. A first hinge hole 84 is provided on each hinged portion 83 and passes through the body of the backrest 8. A second connecting portion 91 is protruded downward from the front part of the backrest 9. A second hinge hole 92 is provided on the second connecting portion 91. The second connecting portion 91 is inserted into the movable groove 82. The second connecting portion 91 does not connect with any part of the movable groove 82. The hinge shaft passes through the first hinge hole 84 and the second hinge hole 92 to hinge the backrest 8 and the backrest 9;

[0038] The assembly method of the above-mentioned split chair back is as follows:

[0039] Step 1) After fixing the chair back frame 7, backrest frame 8 and lumbar support plate 10, place them horizontally in a positioning space on the workbench; wherein the positioning space matches the assembled backrest frame 8 and chair back frame 7;

[0040] Step 2) Install the lumbar support plate 10 and the lumbar support frame 9 on the workbench, and press the lumbar support frame 9 downward with the positioning hook 63 so that the first hinge hole 84 on the lumbar support frame 9 and the second hinge hole 92 on the lumbar support frame 9 are coaxial;

[0041] Step 3) The positioning hook installed on the workbench 1 hooks the lumbar support frame 9, and the positioning hook 63 pulls the lumbar support frame 9 downward, so that the second connecting portion 91 on the lumbar support frame 9 is inserted into the movable groove 82 of the first connecting portion 81 of the backrest frame 8, and the second hinge hole 92 of the second connecting portion 91 is coaxial with the first hinge hole 84 of the hinge seat on the first connecting portion 81;

[0042] Step 4) Insert the hinge shaft from the side of one hinge portion 83 into the first hinge hole 84 and the second hinge hole 92 to complete the hinge connection between the lumbar support frame 9 and the backrest frame 8;

[0043] Step 5) Disconnect the positioning hook 63 from the lumbar support frame 9 and take out the assembled split chair back.

[0044] The existing installation method of the split chair back requires one person to press and bend the lumbar support frame 9 with force so that the second connecting portion 91 of the lumbar support frame 9 is inserted into the movable groove 82 of the backrest frame 8. The second hinge hole 92 of the lumbar support frame 9 and the first hinge hole 84 of the backrest frame 8 must also be coaxial, and the hinge shaft must be tightly fitted with the backrest frame 8. This makes the split chair back very difficult to assemble. Not only does it require two people to cooperate with each other, but the amount of force applied during the bending of the lumbar support frame 9 is difficult to control, making it difficult to ensure that the first hinge hole 84 and the second hinge hole 92 are always coaxial during the assembly process. The insertion of the hinge shaft is also laborious. However, with the above method, one person can easily and quickly complete the assembly of the split chair back, greatly saving assembly time, improving assembly efficiency, and greatly improving the assembly accuracy of the split chair back.

[0045] An assembly tool for a split chair back, comprising the workbench 1 and the positioning hook 63, wherein the positioning space is enclosed by a first positioning seat 2, a second positioning seat 3, two third positioning seats 4 and two fourth positioning seats 55 mounted on the workbench 1, wherein the first positioning seat 2 is located in front of the second positioning seat 3, the two third positioning seats 4 are located between the first positioning seat 2 and the second positioning seat 3, the two third positioning seats 4 are arranged on the left and right, the positioning hook 63 is located between the first positioning seat 2 and the third positioning seat 4, the two fourth positioning seats 5 are arranged on the left and right, and the two The fourth positioning seat is located between the third positioning seat 4 and the positioning hook 63; in the above step 1), after the chair back frame 7 and the backrest frame are assembled, they are placed together in the positioning space of the workbench 1, wherein the first positioning seat 2 is against the front of the backrest frame 8, the rear of the chair back frame 7 is against the second positioning seat 3, and the two third positioning seats 4 are respectively against the left and right sides of the chair back frame 7, so that the assembled chair back frame 7 and backrest frame 8 can be placed horizontally on the workbench 1, avoiding the chair back frame 7 and backrest frame 8 from moving during the installation of the chair back, thereby ensuring the smooth progress of the assembly work. Furthermore, the workbench 1 is provided with a first sliding hole 12, a second sliding hole 13, two third sliding holes 14, and two fourth sliding holes 15. The first sliding hole 12, the second sliding hole 13, the two third sliding holes 14, and the two fourth sliding holes 15 are all waist-shaped holes. A fastener passes through the first sliding hole 12 and connects to the first positioning seat 2, thereby enabling the first positioning seat 2 to move forward and backward; a fastener passes through the second sliding hole 13 and connects to the second positioning seat 3, thereby enabling the second positioning seat 3 to move forward and backward; a fastener passes through the third sliding hole 14 and connects to the third positioning seat 4, thereby enabling the third positioning seat 4 to move left and right; and a fastener passes through the fourth sliding hole 15 and connects to the fourth positioning seat 5, thereby enabling the fourth positioning seat 5 to move left and right on the workbench 1. This arrangement allows the support assembly to better match the chair back frame 7 and the backrest frame 8, greatly improving the positioning accuracy and stability. The above structure can also be compatible with more models of chair backs, thereby expanding the scope of use of the assembly tool. Furthermore, in order to facilitate the placement of the chair back frame 7 and the backrest frame 8, the above-mentioned second positioning seat 3, the two third positioning seats 4 and the two fourth positioning seats 5 are all wedge-shaped, so that after the backrest frame 8 and the chair back frame 7 are connected, the chair back frame 7 and the backrest frame 8 can be naturally installed on the workbench 1, and the chair back frame 7 and the backrest frame 8 can also be fixed. In other embodiments, the first positioning seat 2, the second positioning seat 3, the third positioning seat 4 and the fourth positioning seat 5 can also be installed at other positions of the workbench 1 to support the chair back and to support different parts of the backrest. Furthermore, the second positioning seat 3 is provided with a pressure plate 31 that can move up and down after installation. A limiting hole is provided on the pressure plate 31, and a fastener passes through the limiting hole to fix the pressure plate 31 to the second positioning seat 3. There are two pressure plates 31, and the two pressure plates 31 are symmetrically arranged on the left and right. This can prevent the backrest from tilting during the installation of the lumbar support and ensure the smooth progress of the installation process.

[0046] In this embodiment, the workbench 1 is further provided with an escape groove 16, which is located between the second sliding hole 13 and the third sliding hole 14. A positioning cylinder 61 is mounted on the bottom of the workbench 1. The telescopic end of the positioning cylinder 61 extends upward and passes through the escape groove 16. A mounting seat 62 is fixedly mounted on the telescopic end of the positioning cylinder 61, and the positioning hook 63 is mounted on the top of the mounting seat 62. In this way, the positioning cylinder 61 can better control the movement of the second connecting portion 91 of the lumbar support frame 9, so that the first hinge hole 84 and the second hinge hole 92 are coaxial. Furthermore, there are two positioning hooks 63, one on each side of the chair back frame 7, and the other two positioning hooks 63 are also located on either side of the second connecting portion of the lumbar support frame. In step 3), the two positioning hooks 63 extend from the inside of the lumbar support member and hook onto the inner portion of the lumbar support frame 9. This ensures that the lumbar support frame 9 is evenly stressed, allowing the second connecting portion 91 to move vertically, ensuring that the second hinge hole 92 on the second positioning portion is coaxial with the second hinge holes 92 of the hinge seats located on both sides of the second connecting portion 91. Furthermore, the top of the mounting seat 62 has two third connecting portions protruding from it, and the bottoms of the two positioning hooks 63 are hingedly connected to the two third connecting portions, respectively. In step 3), after the bottom of the lumbar support frame 9 is secured to the lumbar support plate 10, the positioning hooks 63 are flipped so that they hook onto the side walls of the lumbar support frame 9. This prevents interference with the lumbar support frame 9 after positioning during installation, thereby reducing the difficulty of assembling the lumbar support frame 9.

[0047] In this embodiment, a pushing cylinder 65 is also installed on the workbench 1, and the telescopic end of the pushing cylinder 65 points to the first hinge hole 84 on the backrest frame 8. In the step 4), the hinge shaft is placed between the pushing cylinder 65 and the hinge seat on the backrest frame 8. The telescopic end of the pushing cylinder 65 can push the hinge shaft to be inserted into the first hinge hole 84 on the first connecting part 81 on the backrest frame 8 and the second hinge hole 92 of the second connecting part 91 on the lumbar support frame 9, so that the hinge shaft is tightly fitted with the first hinge hole 84; this can reduce the difficulty of assembling the lumbar support and further improve the assembly efficiency of the split chair back. Furthermore, the workbench 1 is also equipped with a height limiting member 64 for adjusting the height of the push cylinder, and the push cylinder is installed on the height limiting member, and the height limiting member 64 includes a first adjustment seat, a second adjustment seat, a third adjustment seat and a fourth adjustment seat, the first adjustment seat and the third adjustment are slidably installed on the workbench, the second adjustment seat is slidably installed on the first adjustment seat, and the fourth adjustment seat is slidably installed on the third adjustment seat, and the push cylinder 65 is installed on the second adjustment seat and the fourth adjustment seat, the first adjustment seat and the third adjustment seat can slide back and forth on the workbench, and the second adjustment seat and the fourth adjustment seat can both slide up and down; on the second adjustment seat A waist-shaped first sliding hole is provided, through which a fastener can be inserted to secure the second adjustment seat to the first adjustment seat. A waist-shaped second sliding hole is provided on the fourth adjustment seat, through which a fastener can be inserted to secure the fourth adjustment seat to the third adjustment seat. In step 1), when the assembled chair back frame 7 and backrest frame 8 are placed horizontally on the workbench 1, the positioning hole of the fixing plate and the first hinge hole 84 on the backrest frame 8 are coaxial. In step 4), the hinge shaft is placed in the positioning hole, and the push cylinder 65 is activated to push the hinge shaft with its telescopic end into the first hinge hole 84 of the backrest frame 8 and the second hinge hole 92 of the lumbar support frame 9. This further reduces the difficulty of assembly and improves assembly efficiency.

[0048] In this embodiment, supporting legs are further installed on the workbench 1 .

[0049] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0050] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. The assembly method of the split chair back is characterized by: Used for assembling a split chair back, wherein the split chair back comprises a chair back frame (7), a backrest frame (8), a lumbar support frame (9) and a lumbar support plate (10), the rear portion of the backrest frame (8) is fixed to the front end of the chair back frame (7), the lumbar support plate (10) is located at the rear side of the backrest frame (8), the front portion of the lumbar support plate (10) is fixed to the chair back frame (7), the rear portion of the lumbar support plate (10) is fixed to the rear portion of the lumbar support frame (9), the front portion of the lumbar support frame (9) is hinged to the rear portion of the backrest frame (8), wherein a first connecting portion (81) protrudes backward on the backrest frame (8), the front portion of the chair back frame (7) is fixedly connected to the lower portion of the first connecting portion (81), and the upper portion of the first connecting portion (81) of the backrest frame (8) is provided with a A movable groove (82), the upper part of the first connecting part (81) protrudes with two hinge parts (83), the two hinge parts (83) are located on both sides of the movable groove (82), and the two hinge parts (83) are each provided with a first hinge hole (84) that passes through the body thereof transversely, the front part of the lumbar support frame (9) protrudes downward with a second connecting part (91), the second connecting part (91) is provided with a second hinge hole (92), the second connecting part (91) is inserted into the movable groove (82), the second connecting part (91) is not connected to any part of the movable groove (82), and the hinge shaft passes through the first hinge hole (84) and the second hinge hole (92) to hinge the backrest frame (8) and the lumbar support frame (9); the installation method of the split chair back is as follows: Step 1) After fixing the chair back frame (7), the backrest frame (8) and the lumbar support plate (10), place them horizontally in the positioning space on the workbench; wherein the positioning space matches the backrest frame (8) and the chair back frame (7) assembled together; the positioning space is enclosed by a first positioning seat (2), a second positioning seat (3), two third positioning seats (4) and two fourth positioning seats (5); the first positioning seat (2) is located in front of the second positioning seat (3), the two third positioning seats (4) are located between the first positioning seat (2) and the second positioning seat (3), and the two third positioning seats (4) are located between the first positioning seat (2) and the second positioning seat (3). The seats (4) are arranged on the left and right sides, the positioning hook (63) is located between the first positioning seat (2) and the third positioning seat (4), and the two fourth positioning seats (5) are arranged on the left and right sides, and the two fourth positioning seats (5) are located between the third positioning seat (4) and the positioning hook (63); wherein, the first positioning seat (2) is against the front of the backrest frame (8), the rear of the chair back frame (7) is against the second positioning seat (3), and the two third positioning seats (4) are against the left and right sides of the chair back frame (7), respectively, so that the chair back frame (7) and the backrest frame (8) assembled together can be placed horizontally on the workbench (1); Step 2) Install the lumbar support plate (10) and the lumbar support frame (9) on a workbench, and press the lumbar support frame (9) downward with a positioning hook (63) on the workbench so that the first hinge hole (84) on the backrest frame (8) and the second hinge hole (92) on the lumbar support frame (9) are coaxial; Step 3) Insert the hinge shaft from the side of the chair back frame (7) into the second hinge hole (92) of the lumbar support frame (9) and the first hinge hole (84) of the back frame (8), and hinge the lumbar support frame (9) and the back frame (8); Step 4) Take out the chair back frame (7), backrest frame (8), lumbar support frame (9) and lumbar support plate (10) that are installed together.

2. The method for assembling a split chair back according to claim 1, wherein: The first positioning seat (2), the two third positioning seats (4) and the two fourth positioning seats (5) are all wedge-shaped.

3. The method for assembling a split chair back according to claim 1, wherein: The first positioning seat (2), the second positioning seat (3), the two third positioning seats (4) and the two fourth positioning seats (5) are all slidably mounted on the workbench (1).

4. The method for assembling a split chair back according to claim 1, wherein: A positioning cylinder (61) is installed on the workbench (1), and the positioning hook (63) is installed on the positioning cylinder (61).

5. The method for assembling a split chair back according to claim 4, wherein: There are two positioning hooks (63), and the chair back frame (7) is located between the two positioning hooks (63).

6. The method for assembling a split chair back according to claim 4, wherein: The positioning hook (63) is hinged to the telescopic end of the positioning cylinder (61).

7. The method for assembling a split chair back according to claim 1, wherein: A push cylinder (65) is installed on the workbench (1), and the telescopic end of the push cylinder (65) faces the first hinge hole (84) on the chair back frame (7).

8. The method for assembling a split chair back according to claim 7, wherein: The push cylinder (65) is installed on the workbench (1) in a liftable manner.

9. An assembly tool, characterized in that: An assembling method for a split chair back as described in any one of claims 1 to 8 is used.

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