Rapid assembly method for handrails

Abstract

The application provides a handrail quick assembly method, which comprises the following steps: firstly, moving the handrail part close to the sofa main body part, and making the second assembly part obliquely lean on the guide plate of the first assembly part to make the handrail part reach the pre-installation position; when the second assembly part leans on the guide plate, the second assembly part and the guide plate do not need to be accurately aligned, and only need to be moved to the close position in the front-back direction; secondly, pushing the handrail part to make the handrail part rotate towards the sofa main body to make the locking pin enter the avoiding hole, and the lower end of the second assembly part is aligned with the opening of the socket of the first assembly part; in this process, the alignment operation is still not needed, and after the handrail part rotates, the locking pin and the avoiding hole are automatically aligned to make the locking pin enter the avoiding hole; finally, moving the handrail part downwards to make the second assembly part and the socket be inserted, the locking pin and the limiting groove are connected, and the handrail part and the sofa main body part are locked in the front-back direction and the left-right direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of furniture, in particular to a quick assembly method of an armrest. BACKGROUND

[0002] Whether it is a long sofa or a single sofa, from the aspects of aesthetics and comfort, it will be equipped with an armrest, and the armrest of the sofa is different from the armrest of the seat, and the armrest of the sofa is often a block structure, and in many cases it is a vertical component that falls to the ground, which is heavy and bulky, and is not very easy to move and move, and such an armrest is not conducive to packaging and transportation, and complete delivery will increase the cost of the manufacturer, and the general practice is to package the sofa and the armrest separately after disassembly, that is, the consumer needs to install the armrest and the sofa, and the manufacturer considers its own interests while ignoring the installation experience of the consumer, and the negative feedback of the consumer will also affect the competitiveness of the product.

[0003] The method for installing the armrest and the sofa is various, such as directly connecting with bolts, which is relatively cumbersome to operate, so the manufacturer will research a more convenient and quick installation method, such as the existing plug-in type installation method, that is, the armrest is provided with a plug, and the sofa main body is provided with a socket, and when the armrest is installed, the armrest is moved from top to bottom, and the plug is inserted into the socket; But this installation method has many problems: 1, the plug needs to be aligned with the socket, the consumer is not convenient to move the armrest, and the operation is difficult, and if there are multiple plugs and sockets, the installation difficulty is higher; 2, after installation, the limiting ability in each direction is poor, and the armrest shakes. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a quick assembly method of an armrest, the steps are: first, move the armrest part close to the sofa main body, so that the second assembly part is inclined to the guide plate of the first assembly part, so that the armrest part reaches the pre-installation position, when the second assembly part is inclined to the guide plate, it is not necessary to accurately align the second assembly part with the guide plate, only need to move them to the close position in the front and rear direction; Then push the armrest part to make the armrest part rotate towards the sofa main body to make the locking pin enter the avoiding hole, the lower end of the second assembly part is aligned with the opening of the socket of the first assembly part, and in this process, no alignment operation is still needed, after the armrest part rotates, the locking pin and the avoiding hole are automatically aligned to make the locking pin enter the avoiding hole; Finally, move the armrest part downward to make the second assembly part and the socket plug-in, the locking pin and the limiting groove are connected, and the armrest part and the sofa main part are locked in the front and rear directions and the left and right directions.

[0005] The technical scheme of the present application is as follows:

[0006] A quick assembly method of an armrest, the steps are:

[0007] S1 reaches the pre-installation position: the armrest part is moved close to the sofa main body part, so that the second assembly part on the armrest part is obliquely placed on the inclined guide plate on the first assembly part, and at this time the second assembly part is in close contact with the inclined guide plate;

[0008] S2 alignment: the armrest part is pushed to rotate towards the sofa main body part until the locking pin on the first assembly part enters the avoiding hole of the second assembly part, and the lower end of the second assembly part is aligned with the opening of the socket on the first assembly part;

[0009] S3 installation: the armrest part is moved downward so that the second assembly part is inserted into the socket, and at the same time the locking pin enters the limiting groove connected with the avoiding hole; at this time the first assembly part and the second assembly part are assembled, and the armrest part and the sofa main body part are locked in the front-rear direction and the left-right direction.

[0010] When the armrest part is assembled with the sofa main body part using this method, precise alignment is not required: when the armrest part is installed on the sofa main body, it needs to be aligned in at least one direction, specifically, the armrest part is generally installed on the sofa main body part in the left-right direction, so the first assembly part and the second assembly part must be aligned in the front-rear direction, but when the second assembly part is placed on the guide plate, it is not necessary to accurately align the second assembly part with the guide plate, only to move them to a close position in the front-rear direction, and in the process of the locking pin entering the avoiding hole, due to the size configuration, when the second assembly part is roughly vertical, the locking pin will inevitably enter the avoiding hole, that is, the alignment of the locking pin and the avoiding hole in this process is automatically completed; when using the existing installation structure for assembly, the armrest part only performs a translational motion, and when aligning the plug and the socket or the pin and the hole, it must be aligned in at least two directions, which is difficult to operate, not to mention that in order to increase the stability of the installation, more than two sets of installation structures are often set, and each set of installation structure needs to be positioned and aligned, and it is difficult to align multiple sets of installation structures at the same time.

[0011] Secondly, after the armrest part is assembled with the sofa main body part using this method, it can ensure that the armrest part will not shake with the sofa main body part, and the stability is strong: the socket can limit the second assembly part in the left-right direction, and the locking pin and the limiting groove can limit the second assembly part in the front-rear direction, so that the armrest part and the sofa main body part are locked in the front-rear direction and the left-right direction.

[0012] Preferably, the locking pin includes a pin head and a pin body. The pin head is farther from the sofa body relative to the pin body, and the diameter of the pin head is larger than the diameter of the pin body, while the diameter of the pin head is smaller than the diameter of the clearance hole. The second assembly includes a limiting part, which is inclined from bottom to top towards the side farther from the first assembly. In step S2, after the pin head passes through the clearance hole, the pin head is located on the back of the second assembly. In step S3, the second assembly moves downward, and the pin head gradually approaches the limiting part until the pin head abuts against the limiting part, locking the armrest and the sofa body in the left-right direction. The limiting part is not vertical but inclined. During installation, the pin head gradually approaches the limiting part. Due to the inclined surface fit, after the pin head abuts against the limiting part, it will continue to press the limiting part, causing the second assembly to be pressed against the first assembly, thereby locking the armrest and the sofa body in the left-right direction.

[0013] Preferably, the diameter of the pin is the same as that of the limiting groove. In step S3, the pin engages with the limiting groove and abuts against the groove wall, locking the armrest and the main body of the sofa in the front-to-back direction.

[0014] Preferably, the opening of the socket is smaller than the thickness of the second assembly. When the second assembly is inserted into the socket, the opening of the socket is opened, and the socket presses the second assembly against the first assembly, thereby ensuring a tight fit between the first and second assemblies and locking the armrest and the main body of the sofa in the left-right direction.

[0015] Preferably, the socket is a plate, comprising a base plate and a pressing plate. The base plate is horizontal and fixedly connected to the first assembly. The pressing plate is generally vertical and tilted upwards towards the main body of the sofa. The tilt of the pressing plate causes the slot opening to be smaller than the thickness of the second assembly, and the pressing plate applies pressure to the second assembly, causing the second assembly to adhere to the first assembly.

[0016] Preferably, the guide plate and the socket are integrally formed, the guide plate is located above the extrusion plate, and the guide plate is inclined from bottom to top toward the armrest; the guide plate, the extrusion plate and the base plate are bent into shape.

[0017] Preferably, the second assembly is a plate, which also includes two protruding side plates. In step S1, when the second assembly is tilted against the guide plate, the side plates are located on both sides of the guide plate. In step S3, after the second assembly is inserted into the socket, the socket is located between the two side plates. When the second assembly is against the guide plate, the side plates also assist in alignment and limit movement during subsequent operations, preventing the second assembly from sliding and detaching from the first assembly during installation. Finally, after installation, the second assembly and the insertion part are still restricted from relative movement by the side plates, preventing the second assembly from sliding relative to the first assembly during use after installation, thereby preventing the armrest from shaking or detaching from the sofa body.

[0018] Preferably, the locking pin is located on the upper part of the first assembly, and the guide plate and socket are located on the lower part of the first assembly. In step S2, the second assembly rests against the guide plate, and the upper part of the second assembly rotates closer to the first assembly. Using the point of contact between the second assembly and the guide plate as the rotation point, the upper part of the armrest is pushed to rotate closer to the main body of the sofa.

[0019] The design starting point, concept, and beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0020] 1. Using this method, precise alignment is not required when assembling the armrests and the main body of the sofa: When installing the armrests onto the main body of the sofa, regardless of the direction of installation, alignment is required in at least one direction. Specifically, the armrests are generally installed onto the main body of the sofa in the left-right direction. Therefore, the first and second components must be aligned in the front-back direction. However, when the second component rests against the guide plate, precise alignment between the second component and the guide plate is not required. Simply move them to a position close to each other in the front-back direction. During the process of the locking pin entering the clearance hole, due to the size configuration, when the second component rotates to approximately vertical position, the locking pin will inevitably enter the clearance hole. In other words, the alignment between the locking pin and the clearance hole is automatically completed during this process. In contrast, when using existing installation structures for assembly, the armrests only undergo translational movement. When aligning the inserts and sockets or the pins and holes, alignment must be performed in at least two directions, which is more difficult. Moreover, to increase installation stability, more than two sets of installation structures are often set up, and each set of installation structures needs to be positioned and aligned. The difficulty of aligning multiple sets of installation structures simultaneously is enormous.

[0021] 2. Using this method, after assembling the armrest and the main body of the sofa, it can ensure that the armrest will not wobble with the main body of the sofa, and the stability is strong: the socket can limit the second assembly in the left and right directions, and the locking pin and the limiting groove can limit the second assembly in the front and back directions, thereby locking the armrest and the main body of the sofa in the front and back directions and the left and right directions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the sofa body and armrests after installation in an embodiment of the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the sofa body and armrests after installation in an embodiment of the present invention. Figure 2 ;

[0024] Figure 3 This is a three-dimensional structural diagram of the first and second fittings on the main body of the sofa in an embodiment of the present invention;

[0025] Figure 4 This is a three-dimensional structural diagram of the second assembly fitting against the guide plate of the first assembly in an embodiment of the present invention;

[0026] Figure 5 This is a three-dimensional structural diagram of the second assembly in an embodiment of the present invention when it rotates toward the first assembly;

[0027] Figure 6 This is a three-dimensional structural diagram of the locking pin entering the clearance hole in an embodiment of the present invention;

[0028] Figure 7 This is a three-dimensional structural diagram of the second assembly and the first assembly completed in an embodiment of the present invention;

[0029] Figure 8 This is a cross-sectional view of the second assembly and the first assembly completed in an embodiment of the present invention;

[0030] Figure 9 This is a front view of the first assembly in an embodiment of the present invention;

[0031] Figure 10 This is a flowchart corresponding to the assembly method of the present invention.

[0032] The reference numerals in the attached drawings are as follows: First assembly 100; Second assembly 200; Armrest 300; Sofa body 400; Plug-in part 1; Socket 11; Guide plate 12; Base plate 13; Extrusion plate 14; Inlet 15; Opening 16; Locking pin 2; Pin body 21; Pin head 22; Plug-in space 3; Limiting part 4; Limiting groove 5; Base part 6; Clearance hole 7; Side plate 8. Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0035] In the description of this invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] The specific embodiments of the present invention are as follows:

[0037] like Figure 10As shown, the present invention provides a quick assembly method for handrails, the steps of which are as follows:

[0038] S1 reaches the pre-installation position: move the armrest 200 close to the main body of the sofa 400, so that the second assembly 200 on the armrest 200 leans against the inclined guide plate 12 on the first assembly 100, at which time the second assembly 200 is in contact with the inclined guide plate 12.

[0039] S2 alignment: Push the armrest 300 to rotate it toward the main body of the sofa 400 until the locking pin on the first assembly 100 enters the clearance hole 7 of the second assembly 200, and the lower end of the second assembly 200 is aligned with the opening 16 of the socket 11 on the first assembly 100.

[0040] S3 Installation: Move the armrest 300 downwards so that the second assembly 200 is inserted into the socket 11, and at the same time, the locking pin 2 enters the limiting groove 5 connected to the clearance hole 7; at this time, the first assembly 100 and the second assembly 200 are assembled, and the armrest 300 and the sofa body 400 are locked in the front-back direction and the left-right direction.

[0041] Using this method, precise alignment is not required when assembling the armrests and the main body of the sofa. When installing the armrests onto the main body, regardless of the direction of installation, alignment is required in at least one direction. Specifically, the armrests are generally installed onto the main body of the sofa in the left-right direction. Therefore, the first and second components must be aligned in the front-back direction. However, when the second component rests against the guide plate, precise alignment between the second component and the guide plate is not required. Simply move them to a position close to each other in the front-back direction. During the process of the locking pin entering the clearance hole, due to the size configuration, when the second component rotates to approximately vertical position, the locking pin will inevitably enter the clearance hole. In other words, the alignment between the locking pin and the clearance hole is automatically completed during this process. In contrast, when using existing installation structures, the armrests only undergo translational movement. When aligning the inserts and sockets or the pins and holes, alignment must be performed in at least two directions, which is more difficult. Moreover, to increase installation stability, two or more sets of installation structures are often set up, and each set of installation structures needs to be positioned and aligned. The difficulty of aligning multiple sets of installation structures simultaneously is enormous.

[0042] Secondly, this method ensures that the armrest will not wobble after assembling with the sofa body, providing strong stability: the socket can limit the second assembly in the left and right directions, and the locking pin and the limiting slot can limit the second assembly in the front and back directions, thereby locking the armrest and the sofa body in both the front and back and left and right directions.

[0043] In step S2, the upper part of the armrest is pushed to rotate closer to the main body of the sofa, with the point of contact between the second assembly and the guide plate as the rotation point.

[0044] This method is used for sofa installation, where the armrests are attached to the main body of the sofa using an installation structure, such as... Figure 3 , 7 As shown, the installation structure includes a first assembly 100 and a second assembly 200. The first assembly 100 includes a plug-in part 1 and a locking pin 2. The plug-in part 1 has an upwardly open and horizontally through plug-in space 3. The second assembly 200 enters the plug-in space 3 from top to bottom, and the plug-in part 1 supports the second assembly 200 from bottom to top. The second assembly 200 includes a limiting part 4. The limiting part 4 is inclined from bottom to top toward the side away from the first assembly 100. A limiting groove 5 is provided on the limiting part 4. The locking pin 2 enters the limiting groove 5 and cooperates with the limiting groove 5. The locking pin 2 abuts against the groove wall of the limiting groove 5. At the same time, the locking pin 2 abuts against the limiting part 4. The limiting part 4 is configured such that after the locking pin 2 enters the limiting groove, the first assembly 100 and the second assembly 200 are locked in the front-back and left-right directions.

[0045] The limiting part 4 is not vertical but inclined. The limiting groove 5 is formed on the limiting part 4. When the locking pin 2 enters the limiting groove 5, the locking pin 2 and the limiting part 4 are pressed tighter and tighter due to the inclined surface cooperation, thereby firmly pressing the second mounting part 200 onto the first mounting part 100 in the left-right direction. The locking pin 2 abuts against the limiting groove 5, and also limits the second mounting part 200 and the first mounting part 100 in the front-back direction, thereby increasing the limiting capacity of the installation structure and making the handrail very stable after installation, preventing wobbling. Moreover, the second mounting part 200 is directly inserted into the insertion part 1 without the need for further processing. The tedious and precise alignment operation is now simple and convenient. Moreover, the insertion part 1 can support the second component 200 from bottom to top, preventing the second component 200 from detaching from the first component 100 due to force. The connection between the first component 100 and the second component 200 is achieved through the cooperation of two different structures: the second component 200 is inserted into the insertion part 1 and the locking pin 2 is engaged with the limiting groove 5. Compared with other existing structures, it is more convenient and faster to install, without the need for tedious alignment of the installation position. After installation, it is more secure and tightly connected, and there will be no shaking or detachment.

[0046] In this embodiment, as Figures 1-3As shown, the second assembly 200 is installed on the armrest 300, and the first assembly 100 is installed on the sofa body 400. Both the second assembly 200 and the first assembly 100 are vertically arranged. After assembly, the second assembly 200 and the first assembly 100 are arranged and installed together in a left-right manner, and the locking pin 2 is also arranged in a left-right direction. The locking pin 2 and the insertion part 1 are distributed vertically at intervals. The insertion part 1 is located at the lower end of the first assembly 100, and the highest point of the insertion part 1 is lower than the height of the locking pin 2, so that the second assembly 200 can be assembled with the locking pin 2 while being assembled with the insertion part 1.

[0047] Specifically, such as Figure 9 As shown, the first assembly 100 also includes a base part 6, which is configured to connect with the main body of the sofa 400. The plug-in part 1 and the locking pin 2 are both provided on the base part 6. The plug-in part 1 is a plate, including a socket 11 and an inlet plate 12. The socket 11 includes a base plate 13 and an extrusion plate 14. The base plate 13 is horizontally arranged and fixedly connected to the base part 6. The lower end of the extrusion plate 14 is connected to the end of the base plate 13 facing the second assembly 200. The lower end of the inlet plate 12 is connected to the upper end of the extrusion plate 14. The extrusion plate 14 is inclined from top to bottom towards the base part 6, and the inlet plate 12 is inclined from bottom to bottom away from the base part 6. The inlet plate 12, the extrusion plate 14 and the base plate 13 are integrally formed, and the plug-in part 1 is bent to form the base plate 13, the extrusion plate 14 and the inlet plate 12.

[0048] Furthermore, such as Figure 9As shown, the distance between the upper end of the guide plate 12 and the reference part 6 is relatively large, making it easier for the second assembly 200 to be placed on the guide plate 12 without requiring precise alignment, simplifying the installation operation and making it easier for consumers to install. The distance between the upper end of the extrusion plate 14 and the reference part 6 is relatively small, providing positioning and limiting for the second assembly 200 as it enters the insertion space 3. Specifically, due to the inclination of the guide plate 12 and the extrusion plate 14, the distance between the insertion part 1 and the reference part 6 varies in the height direction. The distance between the upper end of the guide plate 12 and the reference part 6 is the largest, and the distance between the upper end of the extrusion plate 14 and the reference part 6 is the smallest. Therefore, from top to bottom, the distance between the insertion part 1 and the reference part 6 decreases and then increases again. The second assembly 200 is a plate component. Since the distance between the upper end of the guide plate 12 and the reference part 6 is the largest, Therefore, when the second assembly 200 is installed with the first assembly 100, an inlet 15 is formed between the upper end of the guide plate 12 and the base part 6 for the lower end of the second assembly 200 to enter. The inlet 15 is relatively large, much larger than the thickness of the second assembly 200. The lower end of the second assembly 200 can easily enter the inlet 15, so that the second assembly 200 can rest on the guide plate 12 with almost no alignment. When the second assembly 200 is inserted into the socket 11 and enters the insertion space 3, the opening 16 of the socket 11 is relatively small. It is necessary to push the armrest part 300 downward to allow the second assembly 200 to enter the insertion space 3. The pressing plate 14 presses the second assembly 200, pressing the second assembly 200 against the first assembly 100 to prevent the lower end of the second assembly 200 from shaking, and also pressing the armrest part 300 against the sofa body part 400.

[0049] The locking pin 2 includes a pin body 21 and a pin head 22. The diameter of the pin body 21 is the same as the width of the limiting groove 5, and the pin head 22 protrudes from the pin body 21 in the circumferential direction. When the locking pin 2 engages with the limiting groove 5, the pin body 21 abuts against the groove wall of the limiting groove 5, and the pin head 22 abuts against the limiting part 4. The diameter of the pin body 21 is the same as the width of the limiting groove 5, so that after the locking pin 2 enters the limiting groove 5, both can be limited in the front-rear direction. The diameter of the pin head 22 is larger, so it can contact the surface of the limiting part 4. Since the limiting part 4 is inclined away from the first assembly 100, Since the pin 22 cannot move, during installation, the pin 22 gradually comes into contact with the limiting part 4. The pin 22 abuts against and squeezes the limiting part 4, so that the second assembly 200 is close to the first assembly 100 in the left and right direction to achieve the limiting in the left and right direction. The limiting part 4 is also provided with a clearance hole 7, which is connected to the limiting groove 5. The groove width of the clearance hole 7 is greater than the diameter of the pin 22. The clearance hole 7 is used to avoid the pin 22, so that the pin 22 can pass smoothly through the clearance hole 7, and at the same time, the pin body 21 can enter the clearance hole 7, thereby entering the limiting groove 5.

[0050] When the main body 400 and armrest 300 of the sofa are assembled using existing mounting structures, more than two sets of mounting structures are often required for stable installation. To ensure post-installation stability, existing mounting structures have relatively small assembly areas, thus each set of mounting structures needs to be positioned and aligned. The simultaneous alignment of multiple sets of mounting structures is extremely difficult, making the process cumbersome and resulting in a poor user experience for consumers. Figures 4-8 As shown, the biggest advantage of using the mounting structure in this embodiment to assemble the sofa body 400 and armrest 300 is that it eliminates the need to spend excessive effort on positioning and alignment.

[0051] Simply move the armrest 300 closer to the main body of the sofa 400, so that the second assembly 200 leans against the guide plate 12. Then push the armrest 300 to make it vertical. At this time, the locking pin 2 and the clearance hole will automatically align and the locking pin 2 will enter the clearance hole. Finally, move the armrest 300 downward so that the lower end of the second assembly 200 enters the insertion space 3, and the locking pin 2 engages with the limiting groove 5.

[0052] In addition, such as Figures 4-7 As shown, the second assembly 200 is a plate and also includes two side plates 8 protruding away from the first assembly 100. After the lower end of the second assembly 200 enters the insertion space 3, the insertion part 1 is located between the two side plates 8. The side plates 8 prevent the second assembly 200 from slipping out of the insertion space 3 after installation. The side plates 8 can also assist in the alignment and positioning of the second assembly 200 and the first assembly 100 during installation, and can also limit the second assembly 200 when it is on the guide plate 12 to prevent the second assembly 200 from slipping off the guide plate 12 during installation. Specifically, when the second component 200 is placed on the guide plate 12, the side plate 8 can also assist in alignment and limit the movement during subsequent operations, preventing the second component 200 from sliding and separating from the first component 100 during installation. Finally, after installation, the second component 200 and the plug-in part 1 are still restricted from relative movement by the side plate 8, which also prevents the second component 200 from sliding relative to the first component 100 during use after installation, thereby preventing the armrest part 300 from shaking or separating from the sofa body part 400.

Claims

1. A method of quick assembly of a handrail, characterized in that, The steps are: S1 reaches the pre-installation position: move the armrest part close to the sofa main body part, so that the second assembly part on the armrest part is obliquely placed on the inclined guide plate on the first assembly part, at this time the second assembly part is in close contact with the inclined guide plate; the second assembly part is a plate part, and the second assembly part further includes two protruding side plates, when the second assembly part is obliquely placed on the guide plate, the guide plate is positioned between the two side plates; S2 alignment: the locking pin is located on the upper part of the first assembly part, and the guide plate and the socket are located on the lower part of the first assembly part; when the second assembly part is placed on the guide plate, the upper part of the second assembly part is moved close to the first assembly part by taking the contact point between the second assembly part and the guide plate as the rotation point, so that the locking pin on the first assembly part enters the avoiding hole of the second assembly part, and the lower end of the second assembly part is aligned with the opening of the socket on the first assembly part; the locking pin includes a pin head and a pin body, the pin head is away from the sofa body relative to the pin body, the diameter of the pin head is larger than the diameter of the pin body, and the diameter of the pin head is smaller than the diameter of the avoiding hole; the second assembly part includes a limiting part, which is inclined from bottom to top away from the first assembly part; after the pin head passes through the avoiding hole, the pin head is located on the back of the second assembly part; S3 installation: move the armrest part downward, so that the second assembly part is inserted into the socket, and the locking pin enters the limiting groove connected with the avoiding hole; when the second assembly part is moved downward, the pin head gradually approaches and contacts the limiting part, the pin head and the limiting part are matched through the inclined surface to make the pin head abut and press the limiting part, so that the second assembly part is tightly attached to the first assembly part in the left-right direction, and correspondingly, the armrest part and the sofa main body part are locked in the left-right direction; at this time, the first assembly part and the second assembly part are assembled, the pin body abuts against the groove wall of the limiting groove, the pin head abuts against the limiting part, and the armrest part and the sofa main body part are locked in the front-rear direction and the left-right direction; after the second assembly part is inserted into the socket, the socket is positioned between the two side plates.

2. The method of claim 1, wherein: The diameter of the pin body is the same as that of the limiting groove, in step S3, the pin body is clamped with the limiting groove, the pin body abuts against the groove wall of the limiting groove, and the armrest part and the sofa main body part are locked in the front-rear direction.

3. The method of claim 1, wherein: The opening of the socket is smaller than the thickness of the second assembly part.

4. The method of claim 3, wherein: The socket is a plate part, and the socket includes a bottom plate and a pressing plate, the bottom plate is horizontal and fixedly connected with the first assembly part, and the pressing plate is substantially vertical and inclined from bottom to top toward the sofa main body part.

5. The method of claim 4, wherein: The guide plate and the socket are integrally formed, the guide plate is located above the pressing plate, and the guide plate is inclined from bottom to top toward the armrest part; the guide plate, the pressing plate and the bottom plate are bend-formed.

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