Assembly method of chair armrest and backrest

Abstract

The present invention discloses an assembly method for a chair armrest and a chair back. First, a connecting frame for connecting the chair back and the armrest is installed on an assembly tooling to keep the connecting frame stable during the subsequent assembly process. Then, the armrest is installed on the outer side of the connecting frame through a limiting post, and a connecting piece is used to rotatably install the armrest on the connecting frame from the inner side of the connecting frame. Then, the bottom of the backrest is inserted into the connecting frame, and a fastener is inserted into the connecting frame and the backrest from the outer side of the connecting frame to fix the backrest and the connecting frame. Using the above assembly method, the connecting frame, the chair back, and the two armrests can be installed orderly and quickly. During the assembly process of the connecting frame, the chair back, and the two armrests, the connecting frame can always remain stable, enabling each component to be assembled stably and without interference with other components. This makes the assembly of the chair back and the two armrests more compliant, faster, with higher assembly efficiency and higher assembly accuracy.

Description

Technical Field

[0001] The present invention relates to the field of seat assembly, and particularly to an assembly method for a chair armrest and a chair backrest. Background Art

[0002] In the seat market, the angle adjustment of the armrest is one of the functions that most chairs possess; for the convenience of chair assembly, the chair backrest and the armrests of some chairs are both installed on the same connecting frame and then installed on the seat together. Among them, the bottom of the chair backrest is inserted into the connecting frame and fasteners are required to fix the connecting frame and the chair backrest from the outside of the connecting frame. The two armrests are respectively installed on the left and right sides of the connecting frame, and the connection position between the chair backrest and the connecting frame is very close to the connection position between the armrest and the connecting frame, making the connection structure of the seat more compact, and the structural shape of the connecting frame is very irregular, making the connecting frame unable to be stably placed on a flat workbench, which makes the connection of the chair armrest and the chair backrest very cumbersome and the installation difficulty very high. Summary of the Invention

[0003] In order to solve the problems in the prior art, the purpose of the present invention is to provide an assembly method for a chair armrest and a chair backrest, enabling the armrest and the chair backrest to be quickly installed on the same connecting frame, reducing the difficulty of installation positioning, and improving the efficiency and accuracy of chair assembly.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] An assembling method for a chair armrest and a chair back, wherein the chair back and the armrest are installed on the same connecting frame. Two connecting arms are protruded on the connecting frame and arranged left and right. First connecting holes, first limiting grooves, second limiting grooves, second connecting holes and third connecting holes are formed in both of the two connecting arms. The first connecting holes are located between the first limiting grooves and the second limiting grooves. The first limiting grooves and the second limiting grooves are located between the second connecting holes and the third connecting holes. The first connecting holes, the second connecting holes and the third connecting holes penetrate through the connecting arms horizontally. Third limiting grooves extending forward are formed on the side surfaces of the two connecting arms close to each other. Both the first limiting grooves and the second limiting grooves are waist-shaped grooves. Fourth connecting holes and fifth connecting holes are formed at both left and right ends of the chair back. Limiting portions are protruded at both left and right ends of the chair back. First limiting posts, second limiting posts and third limiting posts are arranged on the armrest. A sixth connecting hole is formed in the first limiting post. The specific steps for installing the chair back and the armrest are as follows: Step 1): Install the connecting frame on the assembly tooling so that the connecting frame is in a suspended state and the two connecting arms of the connecting frame are arranged vertically upward; Step 2): Install the armrests and install the two armrests on the outer sides of the two connecting arms respectively. When installing the armrests, first insert the first limiting post, the second limiting post and the third limiting post of the armrest into the first connecting hole, the first limiting groove and the second limiting groove of the connecting frame respectively, and then insert the connecting pieces into the first connecting hole of the connecting arm and the sixth connecting hole of the first limiting post one by one from the inner sides of the two connecting arms of the connecting frame, and install the armrest rotatably on the connecting frame; Step 3): Install the chair back, align the two limiting portions on the chair back with the third limiting grooves on the two connecting arms of the connecting frame respectively, and then slide the chair back backward along the third limiting grooves of the connecting arms through the limiting portions so that the fourth connecting hole and the fifth connecting hole on the chair back are respectively aligned with the second connecting hole and the third connecting hole on the connecting arm, and then insert the fasteners into the communicated fourth connecting hole and the second connecting hole from the outside to the inside, and insert another fastener into the communicated fifth connecting hole and the third connecting hole from the outside to the inside. The assembly tooling abuts against the chair back from the rear side; Step 4): Take out the assembled chair back and armrest from the assembly tooling.

[0006] Preferably, the assembly tooling includes a bottom plate, and a vertical first positioning plate and a second positioning plate are arranged on the bottom plate. In the step 1), the connecting frame is located between the first positioning plate and the second positioning plate, and the first positioning plate and the second positioning plate clamp the connecting frame and make the connecting arms arranged vertically.

[0007] Preferably, on one side of the first positioning plate close to the second positioning plate, there are two first positioning portions arranged front and back protruding therefrom; on one side of the second positioning plate close to the first positioning plate, there are two second positioning portions arranged front and back protruding therefrom; on the connecting arm of the connecting frame of the chair back, there is a positioning protrusion protruding therefrom, and the first connecting hole, the first limiting groove and the second limiting groove of the connecting frame are all arranged on the positioning protrusion, and the positioning protrusion extends in the front and back directions; in the step 1), one connecting arm of the connecting frame is respectively inserted downward from above between the two first positioning portions on the first positioning plate, and the two first positioning portions abut against the bottom of the positioning protrusion on this connecting arm; the other connecting arm of the connecting frame is respectively inserted downward from above between the two second positioning portions on the second positioning plate, and the tops of the two second positioning portions abut against the bottom of the positioning protrusion on this connecting arm.

[0008] Preferably, a first avoidance groove extending horizontally is formed on the first positioning plate, and the first avoidance groove is located between the two first positioning portions; a second avoidance groove is formed on the second positioning plate, and the second avoidance groove is located between the two second positioning portions; in the step 3), the fastener for connecting the chair back and the connecting frame can, after passing through the first avoidance groove on the first positioning plate and the second avoidance groove on the second positioning plate, fix the chair back and the connecting frame.

[0009] Preferably, a third positioning plate is also vertically installed on the bottom plate, and the third positioning plate is located behind the first positioning plate and the second positioning plate; in the step 3), the third positioning plate supports the chair back from the rear side of the chair back.

[0010] Preferably, the third positioning plate is higher than the first positioning plate and the second positioning plate.

[0011] Preferably, the third positioning plate includes a first supporting portion and a second supporting portion, the bottom of the first supporting portion is fixed to the bottom plate, and the top of the first supporting portion is hinged to the second supporting portion, so that the second supporting portion can swing forward.

[0012] Preferably, a horizontally arranged fourth supporting portion is installed on the second supporting portion, and a supporting groove is formed at the top of the fourth supporting portion; in the step 3), the upper side part of the chair back is hooked in the supporting groove.

[0013] Preferably, the fourth supporting portion is slidably installed on the second supporting portion through a third supporting portion.

[0014] Preferably, the bottom plate is rotatably installed on the base.

[0015] The beneficial effects of the technical solution of the present invention are as follows: By using the above assembly method, the connecting frame, the chair back and the two armrests can be installed orderly and quickly. During the assembly process of the connecting frame, the chair back and the two armrests, the connecting frame can always remain stable, enabling the connecting frame and the components of other chairs to be stably stressed during the one-by-one assembly, and there will be no interference with other components, making the assembly of the chair back and the two armrests more compliant, faster, with higher assembly efficiency and higher assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the chair in the embodiment of the present invention;

[0017] Figure 2 It is a schematic structural diagram of the armrest;

[0018] Figure 3 It is a schematic structural diagram of the connecting frame;

[0019] Figure 4 It is a schematic structural diagram of the backrest;

[0020] Figure 5 It is a schematic structural diagram of the assembly tooling;

[0021] Figure 6 It is a schematic structural diagram of the base.

[0022] Reference numerals: 1, foot; 2, seat; 3, connecting frame; 31, connecting arm; 311, positioning protrusion; 32, first connection hole; 33, first limiting groove; 34, second limiting groove; 35, second connection hole; 36, third connection hole; 37, third limiting groove; 4, armrest; 41, first limiting post; 42, second limiting post; 43, third limiting post; 44, sixth connection hole; 5, backrest; 51, limiting part; 52, fourth connection hole; 53, fifth connection hole; 61, base; 62, bottom plate; 63, first positioning plate; 631, first positioning part; 632, first avoidance groove; 64, second positioning plate; 641, second positioning part; 642, second avoidance groove; 65, third positioning plate; 651, first supporting part; 652, second supporting part; 653, third supporting part; 654, fourth supporting part; 6541, supporting protrusion; 6542, supporting groove; 66, rotating shaft; 67, steel ball. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings. They are merely 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 thus should not be construed as a limitation to the present invention.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0026] In the present invention, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0028] The front, rear, left, and right orientations described in the following embodiments are consistent with those of the chair product. Taking the side of the chair back as the rear, the side opposite to the chair back as the front, and then dividing left and right based on this front and rear. Embodiment

[0029] Such as Figure 1A chair shown, the chair includes bottom feet 1, a seat 2, a connecting frame 3, armrests 4 and a backrest 5; wherein the top of the feet 1 is connected to the bottom of the seat 2, the bottom of the connecting frame 3 bends forward and is connected to the seat 2, two armrests 4 are installed on the left and right sides of the connecting frame 3, and the bottom of the backrest 5 is inserted into the connecting frame 3 from top to bottom and the two are fixedly connected; wherein, as Figures 2 - 4 shown, the specific connection structure of the backrest 5, the armrests 4 and the connecting frame 3 is: two connecting arms 31 are protruded on the connecting frame 3 and arranged left and right, and first connection holes 32, first limiting grooves 33, second limiting grooves 34, second connection holes 35 and third connection holes 36 are formed in both of the two connecting arms 31. The first connection hole 32 is located between the first limiting groove 33 and the second limiting groove 34, the first limiting groove 33 and the second limiting groove 34 are located between the second connection hole 35 and the third connection hole 36, the first connection hole 32, the second connection hole 35 and the third connection hole 36 penetrate the connecting arm 31 horizontally, and third limiting grooves 37 extending forward are formed on the side surfaces of the two connecting arms 31 close to each other. The first limiting groove 33 and the second limiting groove 34 are both waist-shaped grooves; fourth connection holes 52 and fifth connection holes 53 are formed at both left and right ends of the backrest 5, and limiting portions 51 are protruded at both left and right ends of the backrest 5; first limiting posts 41, second limiting posts 42 and third limiting posts 43 are arranged on the armrests 4, and a sixth connection hole 44 is formed in the first limiting post 41.

[0030] An assembling method for the armrests and the backrest of the chair, the connecting frame 3, the backrest 5 and the two armrests 4 of the above chair are quickly connected through an assembling tooling. The specific steps for installing the backrest 5 and the armrests 4 are as follows:

[0031] Step 1) Install the connecting frame 3 on the assembling tooling to make the connecting frame 3 in a suspended state, and the two connecting arms of the connecting frame are arranged vertically upward;

[0032] Step 2) Install the armrests 4, and install the two armrests 4 on the outer sides of the two connecting arms 31 respectively; wherein, when installing the armrests 4, first insert the first limiting post 41, the second limiting post 42 and the third limiting post 43 of the armrests 4 into the first connection hole 32, the first limiting groove 33 and the second limiting groove 34 of the connecting frame 3 respectively, and then insert the connecting pieces into the first connection hole 32 of the connecting arm 31 and the sixth connection hole 44 of the first limiting post 41 one by one from the ends of the two connecting arms 31 of the connecting frame 3 close to each other, so that the armrests 4 are rotatably installed on the connecting frame 3;

[0033] Step 3) Install the backrest 5. Align the two limiting parts 51 on the backrest 5 with the third limiting grooves 37 on the two connecting arms 31 of the connecting frame 3 respectively. Then, the backrest 5 slides backward along the third limiting grooves 37 of the connecting arms 31 through the limiting parts 51, so that the fourth connecting hole 52 and the fifth connecting hole 53 on the backrest 5 are aligned with the second connecting hole 35 and the third connecting hole 36 on the connecting arm 31 respectively. Then, insert the fasteners from the outside to the inside into the connected fourth connecting hole 52 and the second connecting hole 35, and insert another fastener from the outside to the inside into the connected fifth connecting hole 53 and the third connecting hole 36. Then, fix the other side of the backrest to the other connecting arm.

[0034] Step 4) Take out the assembled backrest 5 and the armrest 4 from the assembly tooling.

[0035] Using the above assembly method, the connecting frame 3, the chair back and the two armrests 4 can be installed orderly and quickly. During the assembly process of the connecting frame 3, the chair back and the two armrests 4, the connecting frame 3 can always remain stable, so that each assembly enables the connecting frame 3 and the components of other chairs to be stressed stably, and there will be no interference with other components, making the assembly of the chair back and the two armrests 4 more compliant, faster, with higher assembly efficiency and higher assembly accuracy.

[0036] In order to keep the two connecting arms 31 of the connecting frame 3 always vertically arranged, in this embodiment, as Figure 5As shown, the assembly tooling includes a bottom plate 62, and a vertical first positioning plate 63 and a second positioning plate 64 are arranged on the bottom plate 62; in the step 1), the connecting frame 3 is located between the first positioning plate 63 and the second positioning plate 64, and the first positioning plate 63 and the second positioning plate 64 clamp the connecting frame 3 from the left and right sides and make the connecting arms 31 arranged vertically. In this way, the connecting frame 3 can be quickly installed on the assembly tooling, and the two connecting arms 31 of the connecting frame 3 are always kept vertical. Further, two first positioning parts 631 arranged front and back protrude from one side of the first positioning plate 63 close to the second positioning plate 64, and two second positioning parts 641 arranged front and back protrude from one side of the second positioning plate 64 close to the first positioning plate 63; positioning protrusions 311 protrude on the connecting arms 31 of the connecting frame 3 of the backrest 5, and the positioning protrusions 311 protrude from the front and back sides of the connecting arms 31. The first connecting hole 32, the first limiting groove 33 and the second limiting groove 34 of the connecting frame 3 are all arranged on the positioning protrusions 311; in the step 1), one connecting arm 31 of the connecting frame 3 is respectively inserted downward from above between the two first positioning parts 631 on the first positioning plate 63, and the tops of the two first positioning parts 631 support the bottom of the positioning protrusions 311 on this connecting arm 31; the other connecting arm 31 of the connecting frame 3 is respectively inserted downward from above between the two second positioning parts 641 on the second positioning plate 64, and the tops of the two second positioning parts 641 support the bottom of the positioning protrusions 311 on this connecting arm 31. In this way, the quick positioning of the connecting frame 3 and the assembly tooling can be completed, and the two first positioning parts 631 and the two second positioning parts 641 can respectively clamp the two connecting arms 31 on the connecting frame 3, thereby preventing the connecting frame 3 from swinging during the installation process and increasing the stability of the assembly process. Further, a first avoidance groove 632 extending horizontally is formed on the first positioning plate 63, and the first avoidance groove 632 is located between the two first positioning parts 631. A second avoidance groove 642 is formed on the second positioning plate 64, and the second avoidance groove 642 is located between the two second positioning parts 641; in the step 3), some fasteners for connecting the backrest 5 and the connecting frame 3 can pass through the first avoidance groove 632 on the first positioning plate 63 and the second avoidance groove 642 on the second positioning plate 64 and then fix the backrest 5 and the connecting frame 3. In this way, subsequent installations can be avoided, and the assembly process can proceed stably.

[0037] In this embodiment, as Figure 5As shown, a third positioning plate 65 is vertically installed on the bottom plate 62. The third positioning plate 65 is located at the rear side of the first positioning plate 63 and the second positioning plate 64. In step 3), the third positioning plate 65 supports the middle part of the backrest 5 from the rear side of the backrest 5. In this way, the backrest can be kept stable during the assembly process, so that the connection holes on the backrest 5 and the connection holes on the connection frame 3 are kept concentric and coaxial, reducing the installation difficulty of the backrest 5 and the connection frame 3. Further, the third positioning plate 65 includes a first support portion 651 and a second support portion 652. The bottom of the first support portion 651 is fixed to the bottom plate 62, and the top of the first support portion 651 is hinged to the bottom of the second support portion 652, so that the second support portion 652 can swing forward; the front ends of the first support portion 651 and the second support portion 652 are hinged by a hinge, so that the second support portion can only swing forward to complete folding. Furthermore, the tooling can avoid occupying too much storage space. And since the backrest 5 is curved and the top of the backrest 5 inclines backward, the force balance of the backrest 5 can be ensured. Further, the third positioning plate 65 further includes a third support portion 653 and a fourth support portion 654. The third support portion 653 is slidably connected to the upper side portion of the second support portion 652. Specifically, a waist-shaped groove extending in the front-rear direction is formed in the upper side portion of the second support portion 652, and a fastener passes through the waist-shaped groove and is connected to the third support portion 653; in step 3), after the bottom of the backrest 5 is stuck on the connection frame 3, the fastener can be loosened, and the height of the third support portion 653 can be adjusted up and down so that the third support portion 653 abuts against the upper side portion of the backrest 5, and then the fastener is locked to fix the third support portion and the second support portion. Since the backrest 5 is covered with a structure of a collapsed net frame, by adjusting the height of the third support portion, the assembly tooling can be pressed against the frame of the backrest 5, making the backrest 5 more matched with the assembly tooling. The fourth support portion 654 is arranged horizontally, and the fourth support portion 654 is fixed to the top of the third support portion 653. Two support protrusions 6541 arranged left and right protrude from the top of the fourth support portion 654, and support grooves 6542 are formed in the tops of the two support protrusions 6541. In step 3), the upper side portion of the backrest 5 can be hooked at the support grooves 6542. In this way, the support of the backrest 5 is more stable and symmetric during the whole assembly process.

[0038] In this embodiment, as Figure 5 and Figure 6As shown, for the convenience of operation, a base 61 is rotatably installed at the bottom of the base plate 62. The base 61 is adjacent to the base plate 62 through a rotating shaft 66. Among them, a counterbore is provided at the middle position of the base 61. The bottom of the rotating shaft 66 is inserted into the counterbore. The bottom of the rotating shaft 66 is rotatably connected to the base 61 through a bearing. The bearing is located in the counterbore, and the top of the rotating shaft 66 is fixedly connected to the base plate 62. In this way, in the above steps 2), 3) and 4), workers do not have to move the assembly tooling and the components installed thereon with great effort. Workers can easily rotate the chassis to select a suitable installation position facing themselves, thereby accelerating the assembly progress. Further, a plurality of steel balls 67 are rotatably installed on the base 61. The steel balls 67 are evenly arranged around the rotating shaft 66, and the steel balls 67 can abut against the bottom of the base plate 62, thereby increasing the stability of the support of the base 61 and ensuring the effective progress of the assembly process. Further, the cross-section of the base 61 is smaller than the cross-section of the base plate 62.

[0039] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do 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.

[0040] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A method for assembling a chair armrest and a chair back, characterized in that: The backrest (5) and the armrests (4) are installed on the same connecting frame (3). Two connecting arms (31) are protruded on the connecting frame (3) and arranged left and right. First connecting holes (32), first limiting grooves (33), second limiting grooves (34), second connecting holes (35) and third connecting holes (36) are formed in both of the two connecting arms (31). The first connecting holes (32) are located between the first limiting grooves (33) and the second limiting grooves (34). The first limiting grooves (33) and the second limiting grooves (34) are located between the second connecting holes (35) and the third connecting holes (36). The first connecting holes (32), the second connecting holes (35) and the third connecting holes (36) penetrate through the connecting arms (31) horizontally. Third limiting grooves (37) extending forward are formed on the side surfaces of the two connecting arms (31) close to each other. The first limiting grooves (33) and the second limiting grooves (34) are both kidney-shaped grooves. Fourth connecting holes (52) and fifth connecting holes (53) are formed at both left and right ends of the backrest (5). Limiting parts (51) are protruded at both left and right ends of the backrest (5). First limiting posts (41), second limiting posts (42) and third limiting posts (43) are arranged on the armrests (4). Sixth connecting holes (44) are formed in the first limiting posts (41). The specific steps for installing the backrest (5) and the armrests (4) are as follows: Step 1) Install the connecting frame (3) on the assembly tooling, make the connecting frame (3) in a suspended state, and make the two connecting arms (31) of the connecting frame (3) vertically upward; Step 2) Install the armrests (4). Install the two armrests (4) on the outer sides of the two connecting arms (31) respectively. When installing the armrests (4), first insert the first limiting posts (41), the second limiting posts (42) and the third limiting posts (43) of the armrests (4) into the first connecting holes (32), the first limiting grooves (33) and the second limiting grooves (34) of the connecting frame (3) respectively, and then insert the connecting pieces into the first connecting holes (32) of the connecting arms (31) and the sixth connecting holes (44) of the first limiting posts (41) one by one from the inner sides of the two connecting arms (31) of the connecting frame (3), and install the armrests (4) rotatably on the connecting frame (3); Step 3) Install the backrest (5). Align the two limiting parts (51) on the backrest (5) with the third limiting grooves (37) on the two connecting arms (31) of the connecting frame (3) respectively, and then slide the backrest (5) backward along the third limiting grooves (37) of the connecting arms (31) through the limiting parts (51), so that the fourth connecting holes (52) and the fifth connecting holes (53) on the backrest (5) are respectively aligned with the second connecting holes (35) and the third connecting holes (36) on the connecting arms (31), and then insert the fasteners into the communicated fourth connecting holes (52) and the second connecting holes (35) from the outside to the inside, and insert the other fastener into the communicated fifth connecting holes (53) and the third connecting holes (36) from the outside to the inside. The assembly tooling abuts against the backrest from the rear side; Step 4) Take out the assembled backrest (5) and armrests (4) from the assembly tooling.

2. The assembling method of an armrest and a backrest of a chair according to claim 1, characterized in that: The assembly tool comprises a base plate (62), on which a vertical first positioning plate (63) and a second positioning plate (64) are arranged; in the step 1), the connecting frame (3) is located between the first positioning plate (63) and the second positioning plate (64), and the connecting frame (3) is clamped between the first positioning plate (63) and the second positioning plate (64) and the connecting arm (31) is arranged vertically.

3. A method for assembling a chair armrest and a chair back according to claim 2, characterized in that: A protrusion on one side of the first positioning plate (63) close to the second positioning plate (64) has two first positioning portions (631) arranged in the front and rear directions, and a protrusion on one side of the second positioning plate (64) close to the first positioning plate (63) has two second positioning portions (641) arranged in the front and rear directions; a positioning protrusion (311) is protruded on the connecting arm (31) of the connecting frame (3) of the chair back (5); the first connecting hole (32), the first limiting groove (33) and the second limiting groove (34) of the connecting frame (3) are all arranged on the positioning protrusion (311), and the positioning protrusion (311) extends in the front and rear directions. ; In the step 1), one connecting arm (31) of the connecting frame (3) is inserted from top to bottom between the two first positioning portions (631) on the first positioning plate (63), and the two first positioning portions (631) press against the bottom of the positioning protrusion (311) on the connecting arm (31); the other connecting arm (31) of the connecting frame (3) is inserted from top to bottom between the two second positioning portions (641) on the second positioning plate (64), and the tops of the two second positioning portions (641) press against the bottom of the positioning protrusion (311) on the connecting arm (31).

4. A method for assembling a chair armrest and a chair back according to claim 3, characterized in that: The first positioning plate (63) is provided with a first avoidance groove (632) extending laterally, and the first avoidance groove (632) is located between the two first positioning portions (631); the second positioning plate (64) is provided with a second avoidance groove (642), and the second avoidance groove (642) is located between the two second positioning portions (641); in the step 3), the fastener for connecting the chair back (5) and the connecting frame (3) can fix the chair back (5) and the connecting frame (3) after passing through the first avoidance groove (632) on the first positioning plate (63) and the second avoidance groove (642) on the second positioning plate (64).

5. A method for assembling a chair armrest and a chair back according to claim 3, characterized in that: A third positioning plate (65) is also vertically mounted on the base plate (62), and the third positioning plate (65) is located at the rear side of the first positioning plate (63) and the second positioning plate (64). In step 3), the third positioning plate (65) supports the chair back (5) from the rear side of the chair back (5).

6. A method for assembling a chair armrest and a chair back according to claim 5, characterized in that: The third positioning plate (65) is higher than the first positioning plate (63) and the second positioning plate (64).

7. A method for assembling a chair armrest and a chair back according to claim 5, characterized in that: The third positioning plate (65) includes a first supporting portion (651) and a second supporting portion (652), wherein the bottom of the first supporting portion (651) is fixed to the bottom plate (62), and the top of the first supporting portion (651) is hinged to the second supporting portion (652), so that the second supporting portion (652) can swing forward.

8. A method for assembling a chair armrest and a chair back according to claim 7, characterized in that: A horizontally disposed fourth support portion (654) is mounted on the second support portion (652). A support groove (6542) is formed at the top of the fourth support portion (654). In step 3), the upper portion of the chair back (5) is hooked in the support groove (6542).

9. A method for assembling a chair armrest and a chair back according to claim 8, characterized in that: The fourth support portion (654) is slidably mounted on the second support portion (652) through a third support portion (653).

10. A method for assembling a chair armrest and a chair back according to claim 2, characterized in that: The bottom plate (62) is rotatably mounted on the base (61).

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