Chair with structure for adjusting included angle between back plate and seat plate

Abstract

The utility model discloses a chair with an included angle adjusting structure of a back plate and a seat plate, and each included angle adjusting structure of the back plate and the seat plate comprises a first shell fixed with the seat plate, a second shell fixed with the back plate and an elastic pressing buckling component, the elastic pressing buckling assembly comprises a clamping shaft which is in axial sliding fit in a first center hole of the first shell and a second center hole of the second shell and can be in a state of clamping the two shells or a state of enabling the second shell to coaxially rotate relative to the first shell by releasing clamping. The clamping shaft is a stepped shaft, the stepped shaft is provided with a shaft matched with the hole and radial limiting blocks used for being clamped with the radial limiting grooves, and a round optical shaft section used for being in rotating fit with the center hole of the second shell to adjust the included angle between the back plate and the seat plate is arranged between the first radial limiting block and the second radial limiting block in the axial direction. The chair with the structure for adjusting the included angle between the back plate and the seat plate can prevent misoperation, and is relatively simple in structure and stable and reliable in operation.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture, and specifically relates to a chair with an adjustable structure for the included angle between the backrest and the seat board. Background Art

[0002] There are various types of existing chairs, with different structures and functions.

[0003] However, many chairs require adjustment of the included angle between the backrest and the seat board. For example, for a learning and office chair, during learning and working, the included angle between the backrest and the seat board is about 90° to ensure good sitting postures and learning or working efficiency; while during lunch breaks, the backrest needs to recline and the included angle is adjusted within the range of about 90° - 170° to meet the needs of short naps during lunch breaks.

[0004] For the adjustable structure of the included angle between the backrest and the seat board of existing chairs, there are many types. Generally, a lever - type adjustment structure is adopted. In actual use, the lever is prone to interference with external objects such as hanging clothes or being touched by hands, resulting in misoperation and giving users a poor experience. There are also individual button - type included - angle adjustment structures, but the structures are relatively complex, and the stability and reliability during operation and use are insufficient. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a chair with an adjustable structure for the included angle between the backrest and the seat board, which can prevent misoperation, has a relatively simple structure, and is stable and reliable during operation and use.

[0006] The technical solution of the utility model is to provide a chair with an adjustable structure for the included angle between the backrest and the seat board. The backrest and the seat board are connected by a hinge structure, and at least one side of the hinge structure adopts an adjustable structure for the included angle between the backrest and the seat board; each adjustable structure for the included angle between the backrest and the seat board includes a first housing fixed to the seat board and a second housing fixed to the backrest, and further includes an elastic snap - fit assembly. The elastic snap - fit assembly includes a snap - fit shaft that is axially slidably fitted in a first central hole of the first housing and a second central hole of the second housing, and can be respectively in a state of clamping the two housings or releasing the clamping to enable the second housing to rotate coaxially relative to the first housing.

[0007] After adopting the above structure, the chair with an adjustable structure for the included angle between the backrest and the seat board of the utility model has the following advantages: Since a button such as an elastic snap - fit assembly is used to control the clamping and fixing or releasing the clamping and relative rotation between the seat board and the backrest, it prevents misoperation caused by hanging clothes or touching hands with a lever in the prior art, giving users a good experience. Also, since it is composed of three main components: the first housing, the second housing, and the elastic snap - fit assembly, the structure is relatively simple. Pressing the pressing disc in the elastic snap - fit assembly can rotate the backrest to adjust the angle at the same time. Releasing the pressing disc makes the backrest and the seat board clamp each other, and its operation is convenient, stable, and reliable.

[0008] Further, the first central hole of the first housing is a large-diameter hole, and the large-diameter hole communicates with a first radial limiting groove; the second central hole of the second housing is a small-diameter hole, and the small-diameter hole communicates with a second radial limiting groove; the engaging shaft is a stepped shaft, and the stepped shaft has a large-diameter shaft that mates with the large-diameter hole, a first radial limiting block for engaging with the first radial limiting groove, a small-diameter shaft that mates with the small-diameter hole, and a second radial limiting block for engaging with the second radial limiting groove. There is a circular optical shaft section between the first radial limiting block and the second radial limiting block axially for rotatably mating with the central hole of the second housing to adjust the angle between the back plate and the seat plate. After the engaging shaft adopts the above specific structure, as long as the engaging shaft is pressed to be in different axial positions, the back plate and the seat plate can be engaged or rotated relative to each other. The structure of its core component, such as the engaging shaft, is simple, the operation is convenient, and it is stable and reliable.

[0009] Further, there are two first radial limiting grooves, symmetrically distributed on both sides of the large-diameter hole; there are two first radial limiting blocks, symmetrically distributed on both sides of the large-diameter shaft; there are two second radial limiting grooves, symmetrically distributed on both sides of the small-diameter hole; there are two second radial limiting blocks, symmetrically distributed on both sides of the small-diameter shaft. After adopting the above structure, both the first radial limiting block and the second radial limiting block are two symmetric ones, and both the first radial limiting groove and the second radial limiting groove are two symmetric ones. It has good symmetry and good guiding property. The engagement or disengagement of the radial limiting block with the radial limiting groove is more flexible and smooth, and the stability and reliability of the operation are better.

[0010] Further, one end plate is fixed to the end face of the second housing away from the first housing. The center of the end plate is fixed to one end of a compression spring, and the other end of the compression spring abuts against the end face of the small-diameter shaft of the engaging shaft. There is also a pressing disc for pressing the end of the large-diameter shaft of the engaging shaft. The outer circle of the cylinder of the pressing disc is slidably mated in the third central hole of the cover fixed to the first housing. There is a radially protruding annular edge for axial limiting at the inner end of the cylinder of the pressing disc. After adopting the above structure, the structure is more compact, the pressing and resetting are more convenient, and the operation is more stable and reliable.

[0011] Further, there is an axial convex ring on the end face of the first housing away from the second housing, and there are two axially extending first radial limiting grooves on the axial convex ring. After adopting the above structure, the axial convex ring cooperates with the pressing disc to make the axial position of the stepped shaft more accurate. As long as it is pressed in place, the back plate and the seat plate can rotate flexibly to adjust the angle. As long as the pressing is released, the spring makes the stepped shaft return to the state where the radial limiting blocks are all engaged with the radial limiting grooves, making the operation more stable and reliable.

[0012] Furthermore, the first shell has a plurality of threaded through holes, the cover has a plurality of first screw through holes corresponding to the threaded through holes, and the plurality of first screws pass through the first screw through holes one by one and are screwed into one end of the one by one corresponding threaded through holes. With the above structure, the cover and the first shell are fixed in a detachable manner, which is convenient for installation and disassembly, and the structure is relatively simple, and the detachable fixing is stable and reliable.

[0013] Furthermore, the second shell has a pair of arc-shaped through holes for two second screws to pass through respectively, and the length of each arc-shaped through hole is 80° between the two end points and the center of the second shell; there are two second screw through holes on the end plate, and the two second screws pass through the second screw through holes one by one and then screw into the other end of the corresponding threaded through holes, so that the end plate is in a state of radial and circumferential limit and axial clearance for the second shell to rotate coaxially with respect to the first shell. After adopting the above structure, it can not only ensure that the back plate rotates relative to the seat plate to adjust the angle between the two between about 90°-170°, but also make the end plate fixed with the compression spring radially and circumferentially fixed relative to the first shell, and the fixation of the end plate to the first shell is detachable, which is convenient for installation and disassembly, and the structure is relatively simple, and the detachable fixation is stable and reliable.

[0014] Furthermore, the seat includes a seat bracket, the back includes a back bracket, the end of a longitudinal rod of the seat bracket is fixed to the first shell; the end of a vertical rod of the back bracket is fixed to the second shell. After adopting the above structure, at least one angle adjustment structure between the back and the seat is connected to the back and the seat through a vertical rod of the back bracket and a longitudinal rod of the seat bracket, which not only ensures that the angle adjustment is stable and reliable, but also makes the structure of the back and seat simpler, and the connection and fixation are more firm, more stable and more reliable.

[0015] Furthermore, the cylinder of the cover shell has a first notch for accommodating a longitudinal rod and a second notch for the second shell to rotate coaxially relative to the first shell. With the above structure, the cover shell protects the relatively rotating part and the axial sliding part, and still ensures that the angle adjustment of the back plate relative to the seat plate is convenient, fast and smooth, and the size of the cover shell is relatively small.

[0016] Furthermore, the hinged structures on both sides of the back panel and the seat panel adopt the angle adjustment structure between the back panel and the seat panel, and the two angle adjustment structures on both sides have the same structure and are symmetrically arranged. After adopting the above structure, when adjustment is needed, one finger of each hand can press the two pressing plates at the same time, and the other fingers of both hands can move the back panel to the desired position, or other parts of the body or others can move the back panel to the desired position, and then release the pressing plates. After the hinged structures on both sides of the back panel and the seat panel adopt the angle adjustment structure between the back panel and the seat panel, the operation of adjusting the angle between the back panel and the seat panel of the chair is more stable and more reliable, and due to the symmetrical engagement when resting and leaning back, the firmness, stability and reliability of the chair in the sleeping state and the learning and working state are better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 1 is a schematic structural view of the chair of the present utility model when the included angle between the backrest and the seat plate is about 90° (in the working or studying state).

[0018] Figure 2 is Figure 1 an enlarged exploded view of an included angle adjusting structure in FIG. 1 Figure 1 .

[0019] Figure 3 is Figure 1 an enlarged exploded view of an included angle adjusting structure in FIG. 1 Figure 2 (each component is rotated by about 90° on the basis of Figure 2 FIG. 1).

[0020] Figure 4 is Figure 1 an enlarged exploded view of an included angle adjusting structure in FIG. 1 Figure 3 (each component is rotated by about 180° on the basis of Figure 2 FIG. 1; the compression spring and the second screw are not shown).

[0021] Figure 5 FIG. 2 is a schematic structural view of the chair of the present utility model when the included angle between the backrest and the seat plate is about 170° (in the lunch break and sleep state).

[0022] As shown in the figures:

[0023] 1. Chair, 11. Support frame, 111. Chair leg, 112. Column, 113. Horizontal connecting rod, 12. Seat plate, 121. Longitudinal rod, 13. Backrest, 131. Vertical rod, 14. Footrest plate, 15. Footrest rod;

[0024] 2. Included angle adjusting structure, 21. First housing, 211. Large-diameter hole, 212. First radial limiting groove, 213. Axial convex ring, 214. Threaded through hole, 22. Second housing, 221. Small-diameter hole, 222. Second radial limiting groove, 223. Arc-shaped through hole, 23. Elastic snap-fastening assembly, 231. Clamping shaft, 2311. Large-diameter shaft, 2312. First radial limiting block, 2313. Small-diameter shaft, 2314. Second radial limiting block, 2315. Circular optical axis section, 232. End plate, 2321. Second screw through hole, 233. Compression spring, 234. Pressing disc, 2341. Cylinder, 23411. Annular edge, 235. Cover shell, 2351. Third central hole, 2352. First screw through hole, 2353. First notch, 2354. Second notch, 236. First screw, 237. Second screw. DETAILED DESCRIPTION OF THE INVENTION

[0025] The following further describes the specific embodiments of the present utility model in conjunction with the accompanying drawings. It should be noted here that the description of these specific embodiments is used to help understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the various specific embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown.

[0027] The existing chair 1, commonly known as a chair, such as a learning and office chair 1, includes a support frame 11 composed of two chair legs 111, two columns 112 and a horizontal connecting rod 113. A seat board 12 is fixedly connected to the top of the column 112. The seat board 12 may include a seat board bracket, generally a seat board frame composed of two parallel longitudinal rods 121 and two parallel cross rods. It may also include a pair of footrest rods 15, which are retracted into a pair of longitudinal rods 121 during learning or working and can be extended during a nap. It may also include a footrest board 14, which hangs down during learning or working and can be rotated to a flat position during a nap and is positioned by means of male and female snap fasteners, etc. It further includes a backrest 13, and the backrest 13 may include a backrest bracket, generally a backrest frame composed of two parallel vertical rods 131 and two parallel cross rods. The backrest 13 and the seat board 12 may be hinged, such as hinged through a hinge or a structure of inner and outer sleeves, and a relative limiting structure may be provided; or one side may be hinged, and the other side may adopt an angle adjustment structure for the backrest and the seat board.

[0028] The chair of the present utility model having an angle adjustment structure between the backrest and the seat board may also be referred to as a chair having an angle adjustment structure between the seat board and the backrest. The backrest 13 and the seat board 12 may be connected through two hinge structures, and at least one of the hinge structures on one side adopts an angle adjustment structure 2 between the backrest 13 and the seat board 12 in the present utility model. Each angle adjustment structure 2 between the backrest 13 and the seat board 12 includes a first housing 21 fixedly connected to the seat board 12, such as by welding, and a second housing 22 fixedly connected to the backrest 13, such as by welding. The chair of the present utility model having an angle adjustment structure between the backrest and the seat board further includes a spring-loaded snap-fit assembly 23. The spring-loaded snap-fit assembly 23 includes a snap-fit shaft 231 that is axially slidably fitted in the first central hole of the first housing 21 and the second central hole of the second housing 22 and can be respectively in a state of clamping the two housings or releasing the clamping to enable the second housing 22 to rotate coaxially relative to the first housing 21.

[0029] The first central hole of the first housing 21 is a large-diameter hole 211, and the large-diameter hole 211 communicates with a first radial limiting groove 212; the second central hole of the second housing 22 is a small-diameter hole 221, and the small-diameter hole 221 communicates with a second radial limiting groove 222; the engaging shaft 231 is a stepped shaft, and on the stepped shaft, there is a large-diameter shaft 2311 that mates with the large-diameter hole 211, a first radial limiting block 2312 for engaging with the first radial limiting groove 212, a small-diameter shaft 2313 that mates with the small-diameter hole 221, and a second radial limiting block 2314 for engaging with the second radial limiting groove 222. There is a circular optical shaft section 2315 between the first radial limiting block 2312 and the second radial limiting block 2314 for rotational mating with the central hole of the second housing 22, i.e., the small-diameter hole 221, to adjust the angle between the back plate 13 and the seat plate 12.

[0030] There are two first radial limiting grooves 212, symmetrically distributed on both sides of the large-diameter hole 211; there are two first radial limiting blocks 2312, symmetrically distributed on both sides of the large-diameter shaft 2311. There are two second radial limiting grooves 222, symmetrically distributed on both sides of the small-diameter hole 221; there are two second radial limiting blocks 2314, symmetrically distributed on both sides of the small-diameter shaft 2313.

[0031] The elastic engaging assembly 23 further includes: one end plate 232 is fixedly screwed with a screw as described below on the end face of the second housing 22 away from the first housing 21, the center of the end plate 232 is fixedly connected to one end of a compression spring 233, such as by welding, the other end of the compression spring 233 abuts against the end face of the small-diameter shaft 2313 of the engaging shaft 231. The elastic engaging assembly 23 also has a pressing disc 234 for pressing the end of the large-diameter shaft 2311 of the engaging shaft 231. The outer circle of the cylinder 2341 of the pressing disc 234 is in sliding fit with the third central hole 2351 of a cover 235 fixedly screwed on the first housing 21 as described below. There is a radially protruding annular edge 23411 for axial limiting at the inner end of the cylinder 2341 of the pressing disc 234.

[0032] There is an axial convex ring 213 on the end face of the first housing 21 away from the second housing 22, and there are two axially extending first radial limiting grooves 212 on the axial convex ring 213. In other words, the two first radial limiting grooves 212 are provided on the body of the first housing 2 and the axial convex ring 213.

[0033] There are multiple, such as two, threaded through-holes 214 on the first housing 21, and there are multiple, such as two, first screw through-holes 2352 corresponding to the threaded through-holes 214 on the cover 235. Multiple first screws 236 pass through the first screw through-holes 2352 one by one and are screwed into one end of the corresponding threaded through-holes 214.

[0034] The end plate 232 can be fixed by the following specific structure: There is a pair of arc-shaped through holes 223 on the second housing 22 for two second screws 237 to pass through respectively. The length of each arc-shaped through hole 223 is such that the included angle between the two end points and the center of the second housing 22 is 80°. There are two second screw through holes 2321 on the end plate 232. After the two second screws 237 pass through the second screw through holes 2321 one by one and are screwed into the other ends of the corresponding threaded through holes 214, the end plate 232 is in a state of being limited in the radial and circumferential directions and having a coaxial rotation clearance for the second housing 22 relative to the first housing 21 axially.

[0035] Of course, the end plate 232 can also be directly fixed, for example, by screwing to the end of the second housing 22 away from the first housing 21. However, when the second housing 22 rotates, one end face of the compression spring 233 will rub against the end face of the small-diameter shaft 2313. Therefore, it is preferably fixed by the structure described above.

[0036] As described above, the seat plate 12 includes a seat plate bracket, and the backrest 13 includes a backrest bracket. One end of a longitudinal rod 121 of the seat plate bracket is fixed to the first housing 21, such as by welding; one end of a vertical rod 131 of the backrest bracket is fixed to the second housing 22, such as by welding.

[0037] There is a first notch 2353 for accommodating a longitudinal rod 121 and a second notch 2354 for the second housing 22 to rotate coaxially relative to the first housing 21 on the cylinder of the housing 235.

[0038] Preferably, the hinge structures on both sides of the backrest 13 and the seat plate 12 both adopt the included angle adjustment structure 2 of the present invention. The structures of the two included angle adjustment structures 2 on both sides are the same and symmetrically arranged. And for each included angle adjustment structure 2, the first housing 21 is fixed to a longitudinal rod 121, such as by welding, and the second housing 22 of each included angle adjustment structure 2 is fixed to a vertical rod 131, such as by welding.

[0039] The seat plate 12 is also called the seat board. Hinge connection is also called pivot connection or rotational connection. The included angle adjustment structure 2 is also called the angle adjustment structure. The adjustment structure is also called the adjustment device or regulator. The first housing 21 is also called the first adjustment body, and the second housing 22 is also called the second adjustment body. The circular optical axis section 2315 is also called the circular optical axis. The annular edge 23411 is also called the limiting annular edge or circular skirt edge.

[0040] It is not difficult to understand that symmetric arrangement means that the structures are the same but the installation directions are exactly opposite, such as Figure 1 and Figure 5 in which the pressing disks 234 of the two included angle adjustment structures 2 of the backrest 13 and the seat plate 12 both face outward, that is, one faces forward and the other faces backward.

[0041] The adjustment process between the working and studying state and the lying state for lunch break is roughly as follows, taking the hinged structure on both sides of the back plate 13 and the seat plate 12 as an example, the angle adjustment structure 2 of the back plate 13 and the seat plate 12 is adopted:

[0042] When the angle between the back plate 13 and the seat plate 12 is about 90°, it is necessary to adjust to a lying state for a lunch break. One finger of each hand can press the two pressing plates 234 at the same time to make the engaging shaft 231 move axially to the state where the small-diameter hole 221 of the second shell 22 and the circular optical axis segment 2315 of the engaging shaft 231 can rotate freely. The other fingers of both hands can move the back plate 13 to the desired position, or other parts of the body or others can help move the back plate 13 to the desired position. For example, when the angle between the back plate 13 and the seat plate 12 is turned to any desired angle between 90°-170°, the pressing plate 234 is released. At this time, under the spring force of the compression spring 233, the two first radial limit blocks 2312 of the engaging shaft 231 are engaged in the two first radial limit grooves 212 of the first shell 21, and the two second radial limit blocks 2314 are engaged in the two second radial limit grooves 222 of the second shell 22, so that the back plate 13 and the seat plate 12 are relatively fixed.

[0043] On the contrary, when the angle between the back plate 13 and the seat plate 12 is about 90°-170°, it is necessary to adjust to the state of office and study, and one finger of each hand can press the two pressing plates 234 at the same time, so that the engaging shaft 231 moves axially to the small-diameter hole 221 of the second shell 22 and the circular optical axis segment 2315 of the engaging shaft 231 can rotate freely, and the other fingers of both hands can move the back plate 13 to the desired position, or other parts of the body or others can help to move the back plate 13 to the desired position, such as when the angle between the back plate 13 and the seat plate 12 is turned to an angle of about 90°, and then release the pressing plate 234. At this time, under the spring force of the compression spring 233, the two first radial limit blocks 2312 of the engaging shaft 231 are engaged in the two first radial limit grooves 212 of the first shell 21, and the two second radial limit blocks 2314 are engaged in the two second radial limit grooves 222 of the second shell 22, so that the back plate 13 and the seat plate 12 are relatively fixed.

[0044] The above unmarked parts, structures or quantities are not shown in the figures, and some parts in the figures are not marked. The drawings are only for reference only. If there is any inconsistency between the drawings and the text description or between the drawings, the text description shall prevail.

[0045] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A chair with an angle adjustment structure for a back panel and a seat panel, wherein the back panel and the seat panel are connected via a hinge structure, wherein at least one side of the hinge structure adopts an angle adjustment structure for the back panel and the seat panel; characterized in that: The angle adjustment structure between each back plate and the seat plate includes a first shell fixed to the seat plate and a second shell fixed to the back plate, and also includes a spring-loaded snap-fit ​​assembly, which includes a snap-fit ​​shaft that axially slides in the first center hole of the first shell and the second center hole of the second shell, and can be respectively in a state of engaging the two shells or disengaging the engagement to allow the second shell to rotate coaxially relative to the first shell.

2. The chair with a back panel and seat panel angle adjustment structure according to claim 1, characterized in that: The first center hole of the first shell is a large diameter hole, which is connected to a first radial limit groove; the second center hole of the second shell is a small diameter hole, which is connected to a second radial limit groove; the engaging shaft is a stepped shaft, on which there are a large diameter shaft matching the large diameter hole and a first radial limit block for engaging with the first radial limit groove, a small diameter shaft matching the small diameter hole and a second radial limit block for engaging with the second radial limit groove, and between the axial directions of the first radial limit block and the second radial limit block there is a circular optical axis section for rotating with the center hole of the second shell to adjust the angle between the back plate and the seat plate.

3. The chair with a backboard and seat board angle adjustment structure according to claim 2, characterized in that: There are two first radial limit grooves, symmetrically distributed on both sides of the large diameter hole; there are two first radial limit blocks, symmetrically distributed on both sides of the large diameter shaft; there are two second radial limit grooves, symmetrically distributed on both sides of the small diameter hole; there are two second radial limit blocks, symmetrically distributed on both sides of the small diameter shaft.

4. The chair with a backboard and seat board angle adjustment structure according to claim 2, characterized in that: An end plate is fixed to the end face of the second shell away from the first shell, the center of the end plate is fixed to one end of a compression spring, the other end of the compression spring is against the end face of the small diameter shaft of the engaging shaft, and there is also a pressing plate for pressing the end of the large diameter shaft of the engaging shaft, the cylindrical outer circle of the pressing plate is slidably fitted in the third center hole of the cover shell fixed on the first shell, and the cylindrical inner end of the pressing plate has a radially outwardly protruding annular edge for axial limiting.

5. The chair with a backboard and seat board angle adjustment structure according to claim 4, characterized in that: An axial convex ring is disposed on the end surface of the first shell away from the second shell, and two first radial limiting grooves extending axially are disposed on the axial convex ring.

6. The chair with a backboard and seat board angle adjustment structure according to claim 4, characterized in that: The first shell body is provided with a plurality of threaded through holes, the cover shell is provided with a plurality of first screw through holes corresponding to the threaded through holes, and the plurality of first screws pass through the first screw through holes one by one and are tightened in one end of the one by one corresponding threaded through holes.

7. The chair with a backboard and seat board angle adjustment structure according to claim 6, characterized in that: The second shell has a pair of arc-shaped through holes for two second screws to pass through respectively, and the length of each arc-shaped through hole is 80° between the two end points and the center of the second shell; there are two second screw through holes on the end plate, and the two second screws pass through the second screw through holes one by one and then screwed into the other end of the corresponding threaded through holes, so that the end plate is in a state of radial and circumferential limit and axial clearance is left for the second shell to rotate coaxially relative to the first shell.

8. The chair with a backboard and seat angle adjustment structure according to claim 6, characterized in that: The seat plate comprises a seat plate bracket, and the back plate comprises a back plate bracket. The end of a longitudinal rod of the seat plate bracket is fixed to the first shell; the end of a vertical rod of the back plate bracket is fixed to the second shell.

9. The chair with a backboard and seat board angle adjustment structure according to claim 8, characterized in that: The cylinder of the cover shell is provided with a first notch for accommodating a longitudinal rod and a second notch for the second shell to rotate coaxially relative to the first shell.

10. The chair with a backboard and seat angle adjustment structure according to any one of claims 1 to 9, characterized in that: The hinged structures on both sides of the back plate and the seat plate adopt angle adjustment structures between the back plate and the seat plate, and the two angle adjustment structures on both sides have the same structure and are symmetrically arranged.

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