A method of installing a chair

Abstract

The application provides a mounting method of a chair, which comprises the following steps: sleeving one end of a front support and a rear support on a horizontal rod to form a stable V-shaped structure, and sleeving the other end of the front support and the rear support into a mounting groove and an inclined limiting groove respectively, which are arranged on symmetrical seat frame side rods, so that the front support is rotatably connected with the mounting groove, and the rear support can support or release the seat frame by inserting or not inserting a limiting clamping plate into the limiting groove, thereby realizing the switching of the support and folding effects of the chair, saving a complicated folding mechanism, and reducing the assembly steps of the chair.

Description

Technical Field

[0001] This invention relates to the field of chairs, and more particularly to a method for assembling a chair. Background Technology

[0002] In daily life, folding chairs are widely used. Because the chair is required to have a folding function, it is necessary to install a mechanism to realize the folding function on the chair while ensuring the chair's support function. The complex internal structure of the folding mechanism increases the manufacturing cost of folding chairs and makes the installation process more complicated.

[0003] For example, in the folding chair patent CN 217937659, such as this patent Figure 1 As shown, the front leg 3 and the rear leg 4 are separate designs. To ensure the stability of the folding chair, the leg connector 12 needs to be fitted onto them and then fixed. This makes the processing steps of the folding chair complicated and indirectly increases the manufacturing cost. In addition, the seat tube 71 is connected to the backrest 6 to the seat frame 7 by a fixing part 9. The fixing part 9 is rotatably connected to the movable part 10, and the movable part 10 itself is connected to the rear leg 4. That is to say, the folding in this patented folding chair is achieved by the rotatable connection between the fixing part 9 and the movable part 10. This further complicates the installation process of the folding chair. For users, the folding chair has many disassembly and assembly steps, high maintenance costs, and a poor user experience.

[0004] Therefore, through beneficial exploration and research, the applicant has found a solution to the above problems, and the technical solution to be introduced below is the result of this research. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a chair installation method: One end of the front and rear supports is fitted onto a crossbar to form a stable V-shaped support structure. Simultaneously, an installation groove and an inclined limiting groove are pre-set on the symmetrical seat frame side bars. The other ends of the front and rear supports are respectively inserted into the installation groove and the limiting groove, allowing the front support to rotatably connect with the installation groove. The rear support can support or disengage the seat frame by inserting a limiting plate into the limiting groove. This ensures the chair's support effect while enabling switching between support and folding functions, eliminating the need for a complex folding mechanism and reducing the assembly steps of the chair itself.

[0006] The technical solution of this invention is implemented as follows:

[0007] A method for assembling a chair, comprising the following steps:

[0008] S1: Pre-set crossbar; the crossbar is configured as a hollow column, with an insertion slot opened at the end of the crossbar along the crossbar axis, and a alignment mounting hole, a first screw hole and a second screw hole opened at the inner side of the end of the crossbar along the crossbar radially; the alignment mounting hole, the first screw hole and the second screw hole are sequentially moved away from the end of the crossbar along the crossbar axis direction;

[0009] S2: Pre-installed front bracket; one end of the front bracket is configured with an integrally formed second sleeve, the second sleeve has a through second slot, the other end of the front bracket extends outward and a support shaft is configured at the end of the extension, the support shaft is relatively fixed to the front bracket; two symmetrical cut surfaces are arranged on the support shaft, thereby forming a milled flat part at the cut surface; a mounting screw hole is pre-installed on the milled flat part.

[0010] S3: Pre-installed rear bracket; one end of the rear bracket is configured with an integrally formed first sleeve, the first sleeve has a first slot, and the other end of the rear bracket extends outward and is bent at the end of the extension to form a limit plate.

[0011] S4: Pre-installed support component; The support component is configured as two chair legs that are inclined towards each other. The upper ends of the chair legs meet and are integrally formed. An installation port is formed at the meeting point of the upper ends of the chair legs. An insert is pre-installed in the installation port. A positioning hole is pre-set in the radial direction of the installation port. A nut is pre-embedded inside the support component. The threaded hole of the nut is concentric with the positioning hole.

[0012] S5: Install the front and rear brackets; axially fit the second sleeve of the front bracket onto one end of the crossbar, so that the support axis of the front bracket extends forward, and align the second slot of the second sleeve in the front bracket with the second screw hole on the crossbar. Then, pass a second limiting screw through the second slot and screw it into the second screw hole. Next, axially fit the first sleeve of the rear bracket onto the same end of the crossbar, and extend the limiting plate of the rear bracket backward, so that the front and rear brackets form a V-shaped structure. Align the first slot on the rear bracket with the first screw hole on the crossbar, and then pass a first limiting screw through the first slot and screw it into the first screw hole.

[0013] S6: Install the crossbar; Place the mounting opening of the support piece onto the end of the crossbar so that the insert block is locked in the insertion slot, and then screw a pointed screw into the nut. The pointed screw passes through the positioning hole and gradually presses the alignment mounting hole through the bevel of the pointed part of the pointed screw, so that the positioning hole and the alignment mounting hole are concentric, thereby connecting the chair support piece and the crossbar together.

[0014] S7: Repeat steps S5-S6 to symmetrically install the other two front brackets, rear brackets and support components on the other end of the crossbar;

[0015] S8: Preset seat frame; The seat frame includes seat frame side rods arranged symmetrically on the left and right, and a mounting groove is preset on the seat frame side rod. A through insertion slot is preset below the mounting groove. An opening slot is provided at the upper end of the seat frame side rod. The lower end of the opening slot is connected to the mounting groove through the through slot. An inclined limiting groove is provided on the bottom surface behind the mounting groove on the side of the seat frame.

[0016] S9: Install the mounting frame; the side rod of the mounting frame inserts the milled flat part into the mounting groove along the tangential direction of the support shaft in the front bracket through the insertion slot. At the same time, rotate the side rod of the mounting frame to deviate the insertion direction of the milled flat part in the mounting groove. Simultaneously, the limiting plate on the rear bracket is engaged with the limiting groove on the side of the mounting frame. Then, align the through slot with the mounting screw hole on the milled flat part, pass the screw through the through slot, and screw it into the mounting screw hole.

[0017] Preferably, there are three additional steps between steps S1 and S2:

[0018] S1a: A through-hole positioning notch is pre-set on the outer wall of the crossbar, and an installation groove is pre-set at the end of the crossbar;

[0019] S1b: Pre-set thin plate; the thin plate is sized to fit inside the crossbar and has a pre-cut clearance notch;

[0020] S1c: The thin plate is placed inside the crossbar and positioned at the positioning notch. The thin plate is then circumferentially fixed to the crossbar, with the plate positioned perpendicular to the central axis of the crossbar. The positioning notch is then completely filled to avoid affecting the appearance of the crossbar.

[0021] Preferably, in step S1c, the thin plate and the crossbar are kept circumferentially fixed, and the positioning gap is completely filled. This means that the thin plate is welded to the positioning gap through the gap of the positioning gap, and the remaining gap of the positioning gap is filled by welding, while ensuring the roughness of the outer wall of the crossbar after welding.

[0022] Preferably, ensuring the roughness of the outer wall of the crossbar after welding means that after the positioning notch is repaired by welding, the area around the weld on the outer wall of the crossbar needs to be ground smooth so that the weld is flush with the outer wall of the crossbar. In addition to ensuring the aesthetic appearance of the crossbar, grinding can also remove excess welding slag and prevent the crossbar from being corroded from the uneven welding slag exposed to the air.

[0023] Preferably, in step S2, the front bracket is also equipped with an end plate, which is integrally formed with the front bracket through a limiting plate and forms an annular gap with the inner ring of the same side end of the second sleeve; and a slot is provided on the end plate.

[0024] As a preferred option, there are two more steps between steps S4 and S5:

[0025] S4a: Pre-placed spring steel bar; the cross-sectional shape and size of the spring steel bar are configured to be the same as the shape and size of the clearance notch, and after being inserted into the clearance notch, it cannot rotate relative to the thin plate;

[0026] S4b: Insert the end of the spring steel bar into the slot on the front bracket, and then insert the limiting plate into the mounting groove along the opening, so that the end of the crossbar passes through the annular gap, causing the spring steel bar to undergo torsional deformation, so as to complete the application of the preload force of the front bracket to the crossbar.

[0027] Preferably, in step S5, a torsion spring is also installed between the front support and the rear support. One elastic arm of the torsion spring is fixed to the front support, and the other elastic arm is locked to the rear support. This design allows the rear support to maintain a torsional tendency relative to the front support.

[0028] Preferably, an adjusting wrench is also connected to the rear bracket. The rear bracket has a pre-set third screw hole, and the adjusting wrench has a pre-set countersunk through hole. By passing the first threaded fastener through the countersunk through hole and screwing it into the third screw hole on the rear bracket, the adjusting wrench is connected to the rear bracket. By rotating the adjusting wrench, the rotation of the rear bracket can be controlled.

[0029] Preferably, the adjusting wrench includes an operating part and a connecting part formed at the end of the operating part, and a third screw hole is provided on the connecting part. The operating part is arranged along the axis of the crossbar, so that the crossbar is used as a rotation support and there is no need to provide a separate rotating shaft for the adjusting wrench.

[0030] The principle and beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0031] This invention provides a method for installing a chair. In this method, the second sleeve on the front support and the first sleeve on the rear support are fitted onto the crossbar. An installation groove and an inclined limiting groove are pre-set on the symmetrical seat frame side bars. The support shaft on the front support is installed into the installation groove to achieve a rotatable connection between the seat frame and the front support. The limiting plate of the rear support is inserted into the limiting groove, so that the front and rear supports form a stable V-shaped structure supporting the seat frame. When the limiting plate of the rear support is released, the seat frame can rotate relative to the front support. This design realizes the switching between the support and folding effects of the chair, which can ensure the support effect of the chair without affecting the folding of the chair. The simple structure and installation method also reduce the assembly steps of the chair itself. Attached Figure Description

[0032] Figure 1 This is an exploded view of the bracket assembly mounting location in the embodiment;

[0033] Figure 2 This is a schematic diagram showing the deflection of the slot and the clearance notch after the limiting plate of the front bracket is fully inserted into the limiting groove in the embodiment.

[0034] Figure 3 This is an exploded view of the bracket assembly in the embodiment;

[0035] Figure 4 This is a partial cross-sectional view of the bracket assembly assembly in the embodiment;

[0036] Figure 5 This is a schematic diagram of the mounting groove, positioning notch, and limiting slot for the crossbar;

[0037] Figure 6 This is a structural diagram of the crossbar;

[0038] Figure 7 This is a schematic diagram of the rear support structure in the embodiment;

[0039] Figure 8 This is a schematic diagram of the front bracket structure in the embodiment;

[0040] Figure 9 This is a schematic diagram of the bushing structure in the embodiment;

[0041] Figure 10 This is an exploded view of the support shaft of the front bracket and the mounting point of the seat frame in the embodiment;

[0042] Figure 11 This is an enlarged view of the mounting groove on the side of the seat frame in the embodiment;

[0043] Figure 12 This is a partial cross-sectional view of the spring steel rod after the front bracket is installed in the embodiment, showing its deflection.

[0044] Figure 13 This is a partial sectional view of the support shaft of the front bracket and the mounting point of the seat frame in the embodiment;

[0045] Figure 14 This is a cross-sectional view of the support shaft mounting location of the front bracket in the embodiment;

[0046] Figure 15 This is a comparison diagram of the seat frame in the reset state and the free state in the embodiment;

[0047] Figure 16 This is a flowchart illustrating the assembly steps in an embodiment of the present invention;

[0048] Figure 17 This is a schematic diagram of the seat support state in the embodiment;

[0049] Figure 18 This is a schematic diagram of the seat in the detached state in the embodiment;

[0050] Figure 19 Exploded view of the installation of the crossbar and support components;

[0051] Figure 20 This is an enlarged view of the mounting opening on the support component;

[0052] Figure 21 This is a partial sectional view of the mounting point of the crossbar and the support component;

[0053] Figure 22 This is a schematic diagram of the pointed screw.

[0054] The attached figures are labeled as follows: 1-crossbar, 2-adjusting wrench, 3-spring steel bar, 4-torsion spring, 5-support member, 6-protective cover, 7-bracket assembly, 7a-front bracket, 7b-rear bracket, 8-shoulder sleeve, 9-second threaded fastener, 10-first threaded fastener, 11-first limit screw, 12-second limit screw, 13-seat frame, 14-back frame, 15-protective sleeve, 16-threaded fastener, 17-cap, 18-pointed screw, 19-nut, 101-first screw hole, 102-second screw hole, 103-thin plate, 104-avoidance notch, 105-mounting groove, 106-insertion section, 107-limiting slot, 108-positioning notch, 109-alignment mounting hole, 110-insertion groove, 201-countersunk through hole, 202-connecting part, 203- Operating section, 204-actuator plate, 501-mounting port, 502-insertion block, 503-positioning hole, 504-conical surface, 7b1-third screw hole, 7b2-first slot, 7b3-first sleeve, 7b4-limiting plate, 61-through hole c, 7a1-second slot, 7a2-fourth screw hole, 7a3-end plate, 7a4-slot, 7a5-second sleeve, 7a6-mounting Screw hole, 7a7-cut surface, 7a8-support shaft, 7a9-milled flat part, 7a10-limiting plate, 7a11-annular gap, 81-through hole a, 82-through hole b, 83-inner cylinder surface, 131-limiting groove, 132-side of seat frame, 133-through groove, 134-insertion groove, 135-mounting groove, 136-opening groove, 181-pointed part, 182-inverted conical surface Implementation

[0055] 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.

[0056] 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.

[0057] In the description of this invention, the term "at least one" means one or more, unless otherwise expressly defined. The terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] The specific embodiments of the present invention are as follows:

[0059] like Figure 1-22 As shown, this invention provides a method for assembling a chair. Existing folding chairs, in order to maintain both support and folding functions, typically require both a support mechanism and a folding mechanism. This makes the assembly process complex and the chair itself bulky. The purpose of the chair assembly method provided by this invention is to enable the chair to simultaneously possess both support and folding functions without adding a complex folding mechanism, and to allow for free switching between the two functions at any time. This simplifies the assembly process and improves the user experience.

[0060] like Figure 1-22 As shown in the figure, this embodiment provides a method for installing a chair, which is as follows:

[0061] S1: Pre-set crossbar 1; the crossbar 1 is configured as a hollow column, and the hollow design makes the crossbar 1 lightweight; an insertion groove 110 is opened at the end of the crossbar 1 along the axial direction of the crossbar 1, and a alignment mounting hole 109, a first screw hole 101 and a second screw hole 102 are opened on the inner side of the end of the crossbar 1 along the radial direction of the crossbar 1; the alignment mounting hole 109, the first screw hole 101 and the second screw hole 102 are sequentially moved away from the end of the crossbar 1 along the axial direction of the crossbar 1.

[0062] S2: Pre-installed front bracket 7a; as shown Figure 8 As shown, one end of the front bracket 7a is integrally formed with a second sleeve 7a5, and a through second slot 7a1 is opened on the second sleeve 7a5. The second slot 7a1 is pre-set for fixing the front bracket 7a. The other end of the front bracket 7a extends outward and a support shaft 7a8 is arranged at the end of the extension. The support shaft 7a8 is relatively fixed to the front bracket 7a. The fixing method can be achieved by welding. Two cut surfaces 7a7 are symmetrically arranged on the support shaft 7a8, thereby forming a milled flat part 7a9 at the cut surface 7a7. A mounting screw hole 7a6 is pre-set on the milled flat part 7a9.

[0063] S3: Pre-installed rear bracket 7b; as shown Figure 7 As shown, one end of the rear bracket 7b is configured with an integrally formed first sleeve 7b3, which can be inserted into the end of the crossbar 1; a first slot 7b2 is opened on the first sleeve 7b3, and the other end of the rear bracket 7b extends outward and is bent at the end of the extension to form a limit plate 7b4.

[0064] S4: Pre-installed support component 5; such as Figure 19 As shown, the support member 5 is configured as two opposing inclined chair legs. The upper ends of the chair legs meet and are integrally formed, eliminating the need for connecting parts between the front and rear chair legs and ensuring the support strength of the support member 5. An installation port 501 is formed at the meeting point of the upper ends of the chair legs. An insert block 502 is pre-placed in the installation port 501. A positioning hole 503 is pre-set in the radial direction of the installation port 501, and a nut 19 is pre-embedded inside the support member 5. The threaded hole of the nut 19 is concentric with the positioning hole 503, so that the nut 19 can be fixed relative to the support member 5. Of course, the nut 19 can also be configured to be separate from the support member 5, and an installation groove can be opened on the support member 5 to install the nut 19. However, this will cause a large deviation in the concentricity between the nut 19 and the positioning hole 503 on the support member 5 due to installation reasons or processing errors. If the installation is not in place, the guide seat pointed screw 18 may also damage the overall appearance of the support member 5. Therefore, the nut 19 is pre-embedded in the support member 5 during the processing of the support member 5.

[0065] S5: Install the front bracket 7a and the rear bracket 7b; axially fit the second sleeve 7a5 of the front bracket 7a onto one end of the crossbar 1, so that the support shaft 7a8 of the front bracket 7a extends forward, and align the second slot 7a1 of the second sleeve 7a5 in the front bracket 7a with the second screw hole 102 on the crossbar 1. Then, pass a second limiting screw 12 through the second slot 7a1 and screw it into the second screw hole 102. In this way, the rotation range of the front bracket 7a is limited by the cooperation between the second limiting screw 12 and the second slot 7a1, so that the seat frame 13 can rotate as a whole with the front bracket 7a, realizing the back-and-forth tilting function.

[0066] Next, the first sleeve 7b3 of the rear bracket 7b is axially fitted onto the same end of the crossbar 1. The limiting plate 7b4 of the rear bracket 7b extends backward, so that the front bracket 7a and the rear bracket 7b form a V-shaped support assembly 7, thereby stably supporting the seat frame 13. The first slot 7b2 on the rear bracket 7b is aligned with the first screw hole 101 on the crossbar 1. Then, a first limiting screw 11 is passed through the first slot 7b2 and screwed into the first screw hole 101. The cooperation between the first limiting screw 11 and the first slot 7b2 restricts the rotation angle of the rear bracket 7b. It is worth mentioning that the length of the second slot 7a1 is less than the length of the first slot 7b2. This design is so that the front bracket and the seat frame 13 can still rotate back and forth at a small angle along the circumference of the crossbar 1, thereby giving the user the most comfortable experience.

[0067] S6: Install crossbar 1; as follows Figure 19-22As shown, the mounting port 501 of the support member 5 is fitted onto the end of the crossbar 1, so that the insert 502 is locked in the insertion groove 110, preventing the crossbar 1 from rotating circumferentially relative to the support member 5. Specifically, the mounting port 501 on the support member 5 is set as a conical hole, and correspondingly, the end face of the insertion section 106 connecting the crossbar 1 and the mounting port 501 on the support member 5 is a conical surface. In order to avoid insufficient contact between the conical surface and the mounting port 501, the depth of the mounting port 501 is greater than the length of the insertion section 106. This ensures that when the mounting port 501 and the conical surface b11 are engaged, there is always an assembly allowance in the axial direction.

[0068] A pointed screw 18 is screwed into the nut 19. Since the nut 19 is concentric with the positioning hole 503, this ensures that the concentricity between the pointed screw 18 and the positioning hole 503 is good when the pointed screw 18 is screwed into the nut 19.

[0069] The pointed screw 18 passes through the positioning hole 503 and gradually presses against the alignment mounting hole 109 through the inclined surface of the pointed part 181 of the pointed screw 18, making the positioning hole 503 and the alignment mounting hole 109 concentric. Specifically, if the workmanship error of the pre-set alignment mounting hole 110 at the end of the crossbar 1 is small, the pointed screw 18 can easily pass through the alignment mounting hole 110 and the positioning hole 503 at the same time, and the crossbar 1 and the support member 5 are connected together. If the alignment mounting hole 110 and the positioning hole 503 are not concentric due to workmanship error, the inclined surface of the pointed part 181 of the pointed screw 18 can gradually press against the alignment mounting hole 110, making the positioning hole 503 and the alignment mounting hole 110 concentric, thereby connecting the support member 5 and the crossbar 1 together.

[0070] Furthermore, the positioning hole 503 on the support member 5 also has a shaped conical surface 504 in the radial direction. After the pointed screw 18 is fully screwed into the nut 19, the inverted conical surface 182 of the head of the pointed screw 18 is also screwed into the conical surface 504, and the head of the pointed screw 18 is not exposed. This design is mainly to maintain the overall appearance of the support member 5. Since the head of the pointed screw 18 enters the conical surface 504 and is not exposed, the head of the pointed screw 18 is not easily subjected to the torque generated by vibration and impact and acting on the circumference of the pointed screw 18, that is, it will not loosen relative to the support member 5.

[0071] When the head of the pointed screw 18 enters the conical surface 504 without being exposed, in order to adjust the connection or position of the support 5 and the crossbar 1, the head of the pointed screw 18 is slotted into a hexagon, so that the pointed screw 18 can be loosened or tightened by an ordinary Allen wrench.

[0072] S7: Repeat steps S5-S6 to install the other two front brackets 7a and rear brackets 7b symmetrically with the support 5 at the other end of the crossbar 1, so that the seat initially forms a stable and symmetrical support mechanism.

[0073] S8: Preset seat frame 13; such as Figure 11 As shown, the seat frame 13 includes seat frame side rods 132 arranged symmetrically on the left and right sides. The seat frame side rods 132 are pre-set with mounting grooves 135. A through insertion slot 134 is pre-set below the mounting groove 135. The insertion slot 134 is set to better cooperate with the support shaft 7a8. An opening groove 136 is provided at the upper end of the seat frame side rod 132. The lower end of the opening groove 136 is connected to the mounting groove 135 through a through slot 133. An inclined limiting groove 131 is provided on the bottom surface behind the mounting groove 135 of the seat frame side 132.

[0074] S9: Mounting frame 13; as shown Figure 10-15 As shown, the seat frame side rod 132 inserts the milled portion 7a9 into the mounting groove 135 through the insertion slot 134 along the direction of the cross-section 7a7 on the support shaft 7a8 in the front bracket 7a. At the same time, the seat frame side rod 132 is rotated to deviate the milled portion 7a9 from the insertion direction in the mounting groove 135, preventing the milled portion 7a9 from sliding out of the seat frame. Simultaneously, the limiting plate 7b4 on the rear bracket 7b is engaged into the limiting groove 131 on the seat frame side 132. Thus, when the rear bracket 7b rotates under the action of external force, the limiting plate 7b4 is inserted into the limiting groove 131, and the front bracket 7a and the rear bracket 7b provide stable support for the seat frame 13. When the limiting plate 7b4 leaves the limiting groove 131, the seat frame 13 can rotate around the front bracket 7a.

[0075] like Figure 2 , Figure 18 As shown, the limiting plate 7b4 leaves the limiting groove 131 in the following way: An adjusting wrench 2 is connected to the rear bracket 7b. Under the action of the adjusting wrench 2, the limiting plate 7b4 can selectively cooperate with the limiting groove 131, so that the seat frame 13 can be in a supported state and a disengaged state.

[0076] Furthermore, the adjusting wrench 2 controls the rear support 7b in the following way: the adjusting wrench 2 includes an operating part 203 and a connecting part 202 formed at the end of the operating part 203. The operating part 203 is arranged along the axis of the support beam, and the connecting part 202 is connected to the rear support 7b. The operating part 203 is turned to make the connecting part 202 drive the rear support 7b to rotate. The rear support 7b has a third screw hole 7b1, and the connecting part has a countersunk through hole 201. By passing the first threaded fastener 10 through the countersunk through hole 201 and screwing it into the third screw hole 7b1 on the rear support 7b, the adjusting wrench 2 is rotated to the rear support 7b.

[0077] More specifically, the operating part 203 and the connecting part 202 are made of plastic. The operating part 203 is an arc-shaped plate attached to the outer wall of the crossbar 1, and the arc-shaped plate is arranged along the length of the crossbar 1. A lever plate 204 is formed at the edge of the middle position of the arc-shaped plate. The operating part 203 rotates around the crossbar 1, causing the connecting part 202 to drive the rear bracket 7b to rotate. The arc-shaped plate is attached to the outside of the crossbar 1, without occupying additional space, and cleverly utilizes the crossbar 1 as a rotation support, eliminating the need for a separate pivot.

[0078] Align the through slot 133 with the mounting screw hole 7a6 on the milled flat part 7a9, pass the screw 16 through the through slot 133 and screw it into the mounting screw hole 7a6. By limiting the length of the through slot 133, the rotation angle of the seat frame 13 is limited, thereby preventing the support shaft 7a8 from rotating out of the mounting slot 135.

[0079] like Figure 17-18 As shown, after the chair is installed, the support state of the seat frame 13 is achieved as follows: when the limiting plate 7b4 is locked in the preset limiting groove 131 below the chair side rod 132 that are symmetrical on the left and right sides of the seat frame 13, the limiting groove 131 restricts the limiting plate 7b4 from coming out, and the seat frame 13 is stably supported.

[0080] The disengaged state of the seat frame 13 is achieved as follows: when the seat frame 13 needs to be disengaged, the adjusting wrench 2 is turned to rotate the rear bracket 7b, causing the limiting plate 7b4 on the rear bracket 7b to disengage from the limiting groove 131. Then the seat frame 13, which is connected to the upper end of the front bracket 7a, loses the support point provided by the rear bracket 7b, and the seat frame 13 can rotate relative to the front bracket 7a to adjust its position.

[0081] The reset state of the seat frame 13 is achieved as follows: Because the limiting groove 131 is inclined and limited by the arc-shaped rotation trajectory of the seat frame or rear bracket 7b, it is difficult to immediately engage the limiting groove 131. Figure 1-2 As shown, when the seat frame 13 needs to be reset, the adjusting wrench 2 needs to be rotated again so that the limiting plate 7b4 avoids the seat frame 13 and is engaged in the limiting groove 131. Then the assembly method of loading pre-tightening force enters the support state again. This operation has no complicated steps and only requires turning.

[0082] like Figure 1-8 As shown, between steps S1 and S2, there are three more steps. These three steps are mainly to prepare for applying preload between the front bracket 7a and the crossbar 1. The specific implementation method is as follows:

[0083] S1a: A through positioning notch 108 is pre-set on the outer wall of the crossbar 1, and an installation groove 105 is pre-set at the end of the crossbar 1. The starting end of the installation groove 105 corresponds to the end of the crossbar 1 and is open. The end of the installation groove 105 extends toward the middle part of the crossbar 1. From the starting end to the end, the installation groove 105 extends approximately along the axis of the crossbar 1 and deflects circumferentially to limit the front bracket 7a from sliding out along the installation groove 105.

[0084] S1b: Pre-set thin plate 103; the thin plate 103 is sized to fit inside the crossbar 1, and a clearance notch 104 is pre-cut on the thin plate 103.

[0085] S1c: The thin plate 103 is placed inside the crossbar 1. The thin plate 103 can be placed from the hollow end of the crossbar 1 or directly from the positioning notch 108. When the thin plate 103 is placed from both ends of the crossbar 1, the thin plate can be attracted to the magnet. Then, a long shaft is connected to the magnet and extended into the crossbar 1. The thin plate 103 is fixed at the positioning notch 108. Here, the long shaft and the magnet are actually equivalent to an assembly tool.

[0086] Position the thin plate 103 at the positioning notch 108, and then fix the thin plate 103 and the crossbar 1 circumferentially. The thin plate 103 is placed perpendicular to the central axis of the crossbar 1. Then, completely fill the positioning notch 108, that is, weld the thin plate 103 to the positioning notch 108 through the gap of the positioning notch 108. Then, fill the remaining gaps of the positioning notch 108 by welding. And grind the area around the weld on the outer wall of the crossbar 1 to make the weld seam flush with the outer wall of the crossbar 1, maintain the complete appearance of the crossbar 1, and also remove excess welding slag to prevent the crossbar 1 from being corroded from the uneven welding slag exposed to the air.

[0087] like Figure 1-8 As shown, the process of applying preload between the front bracket 7a and the crossbar 1 is achieved as follows:

[0088] In step S2, the front bracket 7a is also equipped with an end plate 7a3. The end plate 7a3 does not completely close the opening of the second sleeve 7a5. The end plate 7a3 is integrally formed with the front bracket 7a through a limiting plate 7a10, and forms an annular gap 7a11 between it and the inner ring of the same side end of the second sleeve 7a5. The end plate 7a3 is provided with a slot 7a4.

[0089] Add two steps between steps S4 and S5:

[0090] S4a: Pre-installed spring steel rod 3; the cross-sectional shape and size of the spring steel rod 3 are configured to be the same as the shape and size of the clearance notch 104, and after being inserted into the clearance notch 104, it cannot rotate relative to the thin plate 103;

[0091] S4b: Insert the end of the spring steel rod 3 into the slot 7a4 on the front bracket 7a, and then insert the limiting plate 7a10 into the mounting groove 105 along the opening, so that the insertion section 106 at the end of the crossbar 1 passes through the annular gap 7a11. As the second sleeve 7a5 gradually goes deeper, the limiting plate 7a10 is guided by the mounting groove 105 to the limiting slot 107 and deflected at a certain angle. The spring steel rod 3 undergoes torsional deformation, which causes the spring steel rod 3 to twist to generate preload.

[0092] Furthermore, the width of the limiting plate 7a10 is less than the width of the end of the mounting groove 105, thus allowing for the rotation of the front support 7a relative to the crossbar 1. In addition, a limiting slot 107 is provided at the end of the mounting groove 105. The width of the limiting slot 107 is greater than the width of the mounting groove 105. After the limiting plate 7a10 is guided to the limiting slot 107 by the mounting groove 105, the step formed by the height difference between the two prevents the front support 7a from sliding out axially towards the crossbar 1.

[0093] like Figure 1-3 As shown, a torsion spring 4 is provided between the crossbar 1 and the rear support 7b. One elastic arm of the torsion spring 4 acts on the front force arm 7a, and the front force arm 7a remains relatively fixed. The other elastic arm of the torsion spring 4 acts on the rear support 7b, that is, it abuts against the outside of the rear support 7b. The torsion spring 4 makes the rear support 7b always have a rotational tendency to be engaged in the limiting groove 131, which makes the structure of the seat frame 13 more stable when it is in the supported state.

[0094] like Figure 10-14 As shown, the seat frame 13 can rotate relative to the front bracket 7a. A protective sleeve 15 can be installed at the milled flat portion 7a9 of the front bracket 7a. By wrapping the protective sleeve 15, not only can the rotational wear between the support shaft 7a8 on the front bracket 7a and the mounting groove 135 on the side portion 132 of the seat frame be reduced, but the installation fit between the support shaft 7a8 and the mounting groove 135 can also be made more compact.

[0095] like Figure 3 , 4 As shown, a pair of symmetrical covers 6 can also be installed on the chair. The covers 6 are decorative panels made of plastic. Each of the covers 6 has a through hole c61 and a fourth screw hole 7a2 is pre-set on the front bracket 7a. The second threaded fastener 9 passes through the through hole c61 and is screwed into the fourth screw hole 7a2. In this way, when the covers 6 move synchronously with the front bracket 7a, they not only serve to cover and decorate, but also effectively prevent some dust from entering, ensuring the normal operation of the chair.

[0096] like Figure 10As shown, a detachable cover 17 may also be provided at the opening of the slot 136. The cover 17 is used to close the opening slot 136 to prevent dust from entering the opening slot 136 and to maintain the integrity of the appearance of the seat frame 13.

[0097] like Figure 4 , 9 As shown, in addition to directly mounting the front support 7a and the rear support 7b onto the crossbar 1, a bushing 8 can be added to the mounting surface of the crossbar 1 and the front support 7a and the rear support 7b. The bushing 8 is fitted onto the crossbar 1, and the inner cylindrical surface 83 of the end of the bushing 8 abuts against the end of the crossbar 1. The bushing 8 has a through hole a81 and a through hole b82. The first limiting screw 11 passes through the through hole a81, and the second limiting screw 12 passes through the through hole b82, thereby fixing the crossbar 1 and the bushing 8 together. This makes the chair structure more compact and separates the front support 7a, the rear support 7b from the crossbar 1, reducing wear between them.

Claims

1. A method for assembling a chair, characterized in that: The installation method includes the following steps: S1: Pre-set crossbar (1); the crossbar (1) is configured as a hollow column, with an insertion groove (110) opened along the axial direction of the crossbar (1) at the end position of the crossbar (1), and a alignment mounting hole (109), a first screw hole (101) and a second screw hole (102) opened along the radial direction of the crossbar (1) at the inner side of the end position of the crossbar (1); the alignment mounting hole (109), the first screw hole (101) and the second screw hole (102) are sequentially moved away from the end of the crossbar (1) along the axial direction of the crossbar (1); S2: A pre-installed front bracket (7a); one end of the front bracket (7a) is configured with an integrally formed second sleeve (7a5), and a through second slot (7a1) is opened on the second sleeve (7a5). The other end of the front bracket (7a) extends outward and a support shaft (7a8) is configured at the end of the extension. The support shaft (7a8) is relatively fixed to the front bracket (7a); two symmetrical cut surfaces (7a7) are arranged on the support shaft (7a8), thereby forming a milled flat part (7a9) at the cut surface (7a7); a mounting screw hole (7a6) is pre-installed on the milled flat part (7a9). S3: Pre-installed rear bracket (7b); one end of the rear bracket (7b) is configured with an integrally formed first sleeve (7b3), the first sleeve (7b3) has a first slot (7b2), and the other end of the rear bracket (7b) extends outward and is bent at the end of the extension to form a limit plate (7b4). S4: Pre-installed support (5); The support (5) is configured as two chair legs that are inclined towards each other. The upper ends of the chair legs meet and are integrally formed. An installation port (501) is formed at the meeting point of the upper ends of the chair legs. An insert (502) is pre-installed in the installation port (501). A positioning hole (503) is pre-installed in the radial direction of the installation port (501). A nut (19) is pre-embedded inside the support (5), and the threaded hole of the nut (19) is concentric with the positioning hole (503). S5: Install the front bracket (7a) and the rear bracket (7b); axially fit the second sleeve (7a5) of the front bracket (7a) onto one end of the crossbar (1), so that the support shaft (7a8) of the front bracket (7a) extends forward, and align the second slot (7a1) of the second sleeve (7a5) in the front bracket (7a) with the second screw hole (102) on the crossbar (1), then pass a second limiting screw (12) through the second slot (7a1) and screw it into the second screw hole (102). Then, the first sleeve (7b3) of the rear bracket (7b) is axially fitted onto the same end of the crossbar (1), and the limiting plate (7b4) of the rear bracket (7b) extends backward, so that the front bracket (7a) and the rear bracket (7b) form a V-shaped structure. The first slot (7b2) on the rear bracket (7b) is aligned with the first screw hole (101) on the crossbar (1), and a first limiting screw (11) is passed through the first slot (7b2) and screwed into the first screw hole (101). S6: Install the crossbar (1); fit the mounting port (501) of the support (5) onto the end of the crossbar (1), so that the insert (502) is stuck in the insertion slot (110), and then screw a pointed screw (18) into the nut (19). The pointed screw (18) passes through the positioning hole (503) and gradually presses the alignment mounting hole (109) through the inclined surface of the pointed part (181) of the pointed screw (18), so that the positioning hole (503) and the alignment mounting hole (109) are concentric, thereby connecting the chair support (5) and the crossbar (1) together; S7: Repeat steps S5-S6 to symmetrically install the other two front brackets (7a), rear brackets (7b) and support members (5) on the other end of the crossbar (1); S8: Pre-set seat frame (13); The seat frame (13) includes seat frame side rods (132) arranged symmetrically on the left and right sides. The seat frame side rods (132) are pre-set with mounting grooves (135). A through insertion slot (134) is pre-set below the mounting groove (135). An opening slot (136) is provided at the upper end of the seat frame side rods (132). The lower end of the opening slot (136) is connected to the mounting groove (135) through the through slot (133). An inclined limiting slot (131) is provided on the bottom surface behind the mounting groove (135) of the seat frame side (132). S9: Install the mounting frame (13); The mounting frame side rod (132) inserts the milled part (7a9) into the mounting groove (135) along the direction of the cross section (7a7) on the support shaft (7a8) in the front bracket (7a) through the insertion slot (134). At the same time, rotate the mounting frame side rod (132) to deviate the milled part (7a9) from the insertion direction in the mounting groove (135). Simultaneously, the limiting plate (7b4) on the rear bracket (7b) is inserted into the limiting groove (131) on the side part (132) of the mounting frame. Then, align the through slot (133) with the mounting screw hole (7a6) on the milled part (7a9), and screw the screw (16) through the through slot (133) and into the mounting screw hole (7a6).

2. The chair installation method according to claim 1, characterized in that: Between steps S1 and S2, there are three more steps: S1a: A through positioning notch (108) is pre-set on the outer wall of the crossbar (1), and an installation groove (105) is pre-set at the end of the crossbar (1). S1b: Pre-set thin plate (103); the thin plate (103) is sized to fit inside the crossbar (1), and a clearance notch (104) is pre-made on the thin plate (103). S1c: The thin plate (103) is placed inside the crossbar (1) and positioned at the positioning notch (108). The thin plate (103) and the crossbar (1) are then circumferentially fixed. The thin plate (103) is placed perpendicular to the central axis of the crossbar (1). The positioning notch (108) is then completely filled.

3. The chair installation method according to claim 2, characterized in that: In step S1c, the thin plate (103) and the crossbar (1) are kept circumferentially fixed, and the positioning notch (108) is completely filled. This means that the thin plate (103) is welded to the positioning notch (108) through the gap of the positioning notch (108), and the remaining gaps of the positioning notch (108) are filled by welding, and the roughness of the outer wall of the crossbar (1) is ensured after welding.

4. The chair installation method according to claim 3, characterized in that: Ensuring the roughness of the outer wall of the crossbar (1) after welding means that after the positioning notch (108) is repaired by welding, the area around the weld on the outer wall of the crossbar (1) needs to be polished smooth so that the weld is flush with the outer wall of the crossbar (1).

5. The chair installation method according to claim 2, characterized in that: In step S2, the front bracket (7a) is also equipped with an end plate (7a3), which is integrally formed with the front bracket (7a) through a limiting plate (7a10) and forms an annular gap (7a11) with the inner ring of the second sleeve (7a5) on the same side; and a slot (7a4) is provided on the end plate (7a3).

6. The chair installation method according to claim 5, characterized in that: Between steps S4 and S5, there are two more steps: S4a: Pre-installed spring steel bar (3); The cross-sectional shape and size of the spring steel bar (3) are configured to be the same as the shape and size of the clearance notch (104), and after being inserted into the clearance notch (104), it cannot rotate relative to the thin plate (103); S4b: Insert the end of the spring steel bar (3) into the slot (7a4) on the front bracket (7a), and then insert the limiting plate (7a10) into the mounting groove (105) along the opening, so that the end of the crossbar (1) passes through the annular gap (7a11), causing the spring steel bar (3) to undergo torsional deformation.

7. The chair installation method according to claim 6, characterized in that: In step S5, a torsion spring (4) is also installed between the front support (7a) and the rear support (7b). One elastic arm of the torsion spring (4) is fixed on the front support (7a), and the other elastic arm is locked on the rear support (7b).

8. The method for installing a chair according to claim 7, characterized in that: An adjusting wrench (2) is also connected to the rear bracket (7b). The rear bracket (7b) has a pre-set third screw hole (7b1), and the adjusting wrench (2) has a pre-set countersunk through hole (201). The adjusting wrench (2) is connected to the rear bracket (7b) by passing the first threaded fastener (10) through the countersunk through hole (201) and screwing it into the third screw hole (7b1) on the rear bracket (7b).

9. A method for installing a chair according to claim 8, characterized in that: The adjusting wrench (2) includes an operating part (203) and a connecting part (202) formed at the end of the operating part (203). A third screw hole (7b1) is provided on the connecting part (202). The operating part (203) is provided along the axis of the crossbar (1).

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