Cushion assembly and seat

Abstract

The utility model relates to the technical field of furniture articles, and particularly discloses a cushion assembly and a seat, the cushion assembly comprises a first part and a second part, the first part and the second part are connected, and in the supporting direction, the first part is located above the second part; the first part and the second part are at least partially separated, and when the first part is stressed, the first part can elastically move relative to the second part. A user is supported through the cushion frame, and when the first part of the cushion frame is stressed, the first part can elastically move relative to the second part, so that when the user adjusts the sitting posture in real time, the sitting posture of the user can be adjusted along with the change of the position and size of the acting force applied to the first part by the hip of the user; the first part can adaptively adjust the supporting effect counteracting on the buttocks of the user in real time under the action of the elastic force, and the use comfort of the user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture products, and particularly relates to a cushion assembly and a seat having the cushion assembly. Background Art

[0002] With the development of society and the continuous improvement of people's living standards, health has become an increasingly important topic that people pay attention to. People usually need to sit at a desk for a long time continuously when working or studying. Existing office chairs, gaming chairs or household chairs usually include a seat cushion and a backrest. Among them, the seat cushion is used to support the human buttocks, and the backrest is used to support the human back. However, the existing seat cushions cannot appropriately adjust their own states with the adjustment of the user's sitting posture to always fit the user's buttocks, so they cannot provide good support for the human buttocks. As a result, after the user adjusts the sitting posture, the buttocks are prone to a suspended state. Without support, it will cause discomfort to the user in the sitting posture, easy to feel fatigue, and is not conducive to health. Summary of the Invention

[0003] The present invention aims to solve the technical problems existing in the above-mentioned prior art, and provides a cushion assembly and a seat having the cushion assembly, so that the user feels comfortable in the sitting posture.

[0004] To solve the above technical problems, the present invention provides the following technical solutions:

[0005] A cushion assembly according to the present invention includes a seat cushion frame, the seat cushion frame includes a first part and a second part, the first part and the second part are connected, and in the support direction, the first part is located above the second part; at least part of the first part and the second part are separated from each other, and when the first part is stressed, the first part can elastically move relative to the second part.

[0006] The cushion assembly according to the present invention supports the user through the seat cushion frame, wherein the first part is located on one side of the user and directly supports the human buttocks and thighs. When the first part of the seat cushion frame is stressed, since the first part can elastically move relative to the second part, when the user adjusts the sitting posture in real time, as the position and magnitude of the force exerted by the user's buttocks on the first part change, the first part can adaptively adjust the support effect on the user's buttocks in real time under the action of the elastic force, so that the cushion assembly fits well with the user's buttocks and thighs, and improves the user's comfort.

[0007] Further, part of the first part and the second part are connected and part of them are separated, so that at the separation between the first part and the second part, the first part is in a suspended state relative to the second part; the seat cushion frame is made of metal or plastic.

[0008] Furthermore, an installation area is formed at the position where the first part and the second part are separated, and an elastic support structure is provided in the installation area.

[0009] Furthermore, the elastic support structure includes two elastic support rings and an elastic connection part. The two elastic support rings are located at both ends of the elastic connection part and are respectively connected to the corresponding ends of the elastic connection part. When the elastic support structure is installed in the installation area, the two elastic support rings and the elastic connection part are clamped between the first part and the second part;

[0010] Alternatively, the elastic support structure includes a plurality of springs or a plurality of elastic sheets. The plurality of springs or the plurality of elastic sheets are arranged at intervals in the installation area and are clamped between the first part and the second part.

[0011] Furthermore, a first assembly groove is provided in the first part, a second assembly groove is provided in the second part, and a first protrusion and a second protrusion are provided on the two elastic support rings and / or the elastic connection part. The first protrusion is inserted into the first assembly groove, and the second protrusion is inserted into the second assembly groove.

[0012] Furthermore, both sides of the first part are in an upward-sloping state, and a part of the installation area is located between the sloping part of the first part and the second part, so that a part of the installation area is in a sloping state.

[0013] A seat according to the present utility model includes a backrest assembly, a base, and the above-mentioned seat cushion assembly; the seat cushion assembly is connected to the base, and the backrest assembly is connected to the seat cushion assembly or connected to the base.

[0014] The seat according to the present utility model has all the beneficial technical effects brought by the above-mentioned seat cushion assembly, and will not be elaborated here one by one.

[0015] Furthermore, the backrest assembly includes a back support assembly and a waist support assembly, and the back support assembly and the waist support assembly are connected by a first connecting member; the first connecting member includes a first connection end, a second connection end, a third connection end, and a fourth connection end. The first connection end and the second connection end are respectively arranged on both sides of the waist support assembly and are connected thereto, and the third connection end and the fourth connection end are respectively arranged on both sides of the back support assembly and are connected thereto;

[0016] The connection points of the first connection end and the second connection end with the waist support assembly are located on the horizontal center line of the waist support assembly; alternatively, the connection points of the third connection end and the fourth connection end with the back support assembly are located on the horizontal center line of the back support assembly.

[0017] Further, a first fine adjustment assembly is provided between the first connection end of the first connecting member and the lumbar support assembly and / or between the second connection end of the first connecting member and the lumbar support assembly; the first fine adjustment assembly includes a gear switch, a movable member that can elastically move and cooperate with the gear switch, and a first fixing assembly. The gear switch and the movable member are arranged on the first connecting member or the lumbar support assembly. The first connecting member and the lumbar support assembly are connected by connecting the movable member through the first fixing assembly. The movable member is unlocked or locked by adjusting the gear switch, and the movable member is driven to reciprocate horizontally by squeezing or loosening the lumbar support assembly.

[0018] Further, an installation cylinder is provided on the first connecting member. The gear switch is connected to the installation cylinder. At least a part of the movable member is located in the installation cylinder. A first installation groove is provided on the lumbar support assembly. A first soft rubber is arranged in the first installation groove. A part of the movable member passes through the first soft rubber and is connected to a part of the first fixing assembly that penetrates the first installation groove. A spring sleeved on the gear switch is arranged in the installation cylinder. One end of the spring abuts against the end of the installation cylinder, and the other end abuts against the end of the movable member.

[0019] Or, an installation cylinder is provided on the lumbar support assembly. The gear switch is connected to the installation cylinder. At least a part of the movable member is also located in the installation cylinder. A first installation groove is provided on the first connecting member. A first soft rubber is arranged in the first installation groove. A part of the movable member passes through the first soft rubber and is connected to a part of the first fixing assembly that penetrates the first installation groove. A spring sleeved on the gear switch is arranged in the installation cylinder. One end of the spring abuts against the end of the installation cylinder, and the other end abuts against the end of the movable member.

[0020] Further, a second fine adjustment assembly is provided between the third connection end of the first connecting member and the back support assembly and / or between the fourth connection end of the first connecting member and the back support assembly;

[0021] The second fine adjustment assembly includes a second soft rubber and a second fixing assembly. The second soft rubber is arranged between the first connecting member and the back support assembly. A part of the first connecting member passes through the second soft rubber and is connected to a part of the second fixing assembly that penetrates the back support assembly. The first connecting member and the back support assembly are connected through the second fixing assembly, and the second soft rubber is clamped between the first connecting member and the back support assembly; or, the second fine adjustment assembly includes a second soft rubber and a second fixing assembly. The second soft rubber is arranged between the first connecting member and the back support assembly. A part of the back support assembly passes through the second soft rubber and is connected to a part of the second fixing assembly that penetrates the first connecting member. The first connecting member and the back support assembly are connected through the second fixing assembly, and the second soft rubber is clamped between the first connecting member and the back support assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features, and advantages of the present invention will become more apparent from the preferred embodiments of the present invention shown in the accompanying drawings. In all the drawings, the same reference numerals indicate the same parts, and the drawings are not deliberately drawn to scale in actual size, with the emphasis on showing the gist of the present invention.

[0023] Figure 1 It is a schematic structural diagram of the seat of the present invention.

[0024] Figure 2 It is a schematic structural diagram of the cushion assembly.

[0025] Figure 3 and Figure 4 They are exploded schematic diagrams of the cushion assembly in different directions.

[0026] Figure 5 It is a schematic diagram of another embodiment of the elastic support structure.

[0027] Figure 6 It is a schematic diagram of another embodiment of the elastic support structure.

[0028] Figure 7 It is a schematic structural diagram of the backrest assembly.

[0029] Figure 8 and Figure 9 They are exploded schematic diagrams of the backrest assembly in different directions.

[0030] Figure 10 It is a schematic structural diagram of the lifting adjustment assembly.

[0031] Figure 11 and Figure 12 They are exploded schematic diagrams of the lifting adjustment assembly in different directions.

[0032] Figures 13-1 to 13-3 They are cross-sectional views of various states of the lifting adjustment assembly.

[0033] Figure 14 It is a schematic structural diagram of one embodiment of the first micro adjustment assembly.

[0034] Figure 15 and Figure 16 for Figure 14 the exploded schematic diagrams of the first micro adjustment assembly in different directions in

[0035] Figure 17 It is a cross-sectional view of the first micro adjustment assembly.

[0036] Figure 18 for Figure 8 the partial enlarged view of part A in

[0037] Figure 19 It is a schematic structural diagram of another embodiment of the first fine adjustment component.

[0038] Figure 20 It is Figure 19 an exploded schematic diagram of the first fine adjustment component in

[0039] Among them, seat cushion frame 1; base 2; roller 3; first part 4; second part 5; installation area 6; elastic support ring 7; elastic connection part 8; first assembly groove 9; second assembly groove 10; first protrusion 11; second protrusion 12; inclined state 13; lifting adjustment component 14; lumbar support component 15; back support component 16; first connecting piece 17; second connecting piece 18; fixing piece 19; fixing seat 20; elastic piece 21; gear position piece 22; gear position rack 23; engaging tooth 24; first limiting wall 25; first strip-shaped hole 26; first rotating shaft 27; first groove 28; third protrusion 29; first through hole 30; first end 31; second end 32; first gear position 33; first side wall 34; second side wall 35; first connection end 36; second connection end 37; third connection end 38; fourth connection end 39; first fine adjustment component 40; gear position switch 41; moving part 42; installation cylinder 43; baffle 44; decorative operation cover 45; convex plate 46; spring 47; first limiting protrusion 48; second limiting protrusion 49; first soft rubber 50; extrusion end 51; first connecting column 52; first installation groove 53; first connecting threaded part 54; first gasket 55; second soft rubber 56; second connecting column 57; second connecting threaded part 58; headrest component 59; third connecting piece 60; fifth connection end 61; sixth connection end 62; seventh connection end 63; third soft rubber 64; sacral support component 65; first end wall 66; second end wall 67; armrest component 68; through hole 84; handle 85; positioning engagement part 86; tooth surface 87. Specific embodiments

[0040] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0041] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to another element and integrated with it, or there may be an intermediate element at the same time. The terms "installation", "one end", "the other end" and similar expressions used in this article are only for the purpose of illustration.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this technology belongs. The terms used in the description of the specification herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0043] In this application, unless otherwise clearly specified and defined, a first feature being "on" or "under" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may be that the first feature is directly above or obliquely above the second feature, or merely means that the first feature has a higher horizontal height than the second feature. A first feature being "under", "below" and "beneath" a second feature may be that the first feature is directly below or obliquely below the second feature, or merely means that the first feature has a lower horizontal height than the second feature.

[0044] In the description of this specification, the description with reference to terms such as "preferred embodiment", "another embodiment", "other embodiments" or "specific examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0045] The present invention provides a specific implementation manner of a seat cushion assembly, and also provides a specific implementation manner of a seat having such a seat cushion assembly. See Figure 1-2, wherein the seat includes a seat cushion assembly, a backrest assembly, and a base 2. The seat cushion assembly is connected to the base 2, and the backrest assembly is connected to the seat cushion assembly or the base 2. In this embodiment, the backrest assembly is connected to the base 2. The seat cushion assembly includes a seat cushion frame 1, and the seat cushion frame 1 includes a first part 4 and a second part 5. The first part 4 and the second part 5 are connected to each other, and in the support direction, the first part 4 is located above the second part 5; at least part of the first part 4 and the second part 5 are separated from each other. It can be understood that the first part 4 and the second part 5 can be partially connected and partially separated, or the first part 4 and the second part 5 can be completely separated, and the two are connected by an elastic support structure; when the first part 4 is stressed, the first part 4 can elastically move relative to the second part 5. The user is supported by the seat cushion frame 1, wherein the first part 4 is located on one side of the user and directly supports the human buttocks and legs. When the first part 4 of the seat cushion frame 1 is stressed, since the first part 4 can elastically move relative to the second part 5, when the user adjusts the sitting posture in real time, as the position and magnitude of the force exerted by the user's buttocks on the first part 4 change, the first part 4 can adaptively adjust the support effect on the user's buttocks in real time under the action of the elastic force, improving the user's comfort. A base 2 is provided below the seat cushion assembly, and the base 2 is used to provide installation and support for the seat cushion assembly and the backrest assembly, and the base 2 can be configured to move with rollers 3.

[0046] In a preferred embodiment, refer to Figure 2-4, a part of the first part 4 is connected to the second part 5, and a part is separated, so that at the separation between the first part 4 and the second part 5, the first part 4 is suspended relative to the second part 5; the seat cushion frame 1 is made of metal or plastic. In this embodiment, a soft pad or a covering mesh surface is provided on the first part 4, and the soft pad or the mesh surface contacts the human buttocks, while the second part 5 is used to connect to the base 2. When a person sits on the first part 4 provided with the soft pad or the mesh surface, since the first part 4 can elastically move relative to the second part 5, as the sitting posture of the person is adjusted, the first part 4 can prompt the soft pad or the mesh surface to adjust the supporting effect on the human body in real time, improve the comfort of the sitting posture state, and reduce fatigue. When a part of the first part 4 is connected to the second part 5 and a part is separated, so that at the separation between the first part 4 and the second part 5, the first part 4 is suspended relative to the second part 5, due to the material of the seat cushion frame 1 being metal or plastic, the elastic movement effect between the first part 4 and the second part 5 can be improved. In addition, the first part 4 can adopt a frame structure, that is, a frame body with through holes, or a plate structure. In this embodiment, the frame structure is adopted, which can further improve the elastic movement effect. In this embodiment, a part of the first part 4 is connected to the second part 5, and a part is separated, and the length of the separated part is greater than the length of the connected part. Specifically, both the first part 4 and the second part 5 are quadrilateral, the sides facing away from the backrest assembly are connected, and the other three sides are separated, so that the first part 4 forms an open state relative to the second part 5. When the seat cushion frame 1 is made of metal or plastic, combined with the structure of this open state, the elastic movement effect of the first part 4 relative to the second part 5 can be better improved, and the comfort of the user can be improved.

[0047] In a preferred embodiment, referring to Figure 2 , an installation area 6 is formed at the separation position between the first part 4 and the second part 5, and an elastic support structure is provided in the installation area 6. Specifically, the elastic support structure is arranged in the installation area 6 and is clamped between the first part 4 and the second part 5, and the elastic support structure provides an elastic support force for the first part 4, so as to further improve the elastic movement effect of the first part 4 relative to the second part 5 and improve the use comfort of the user.

[0048] In a preferred embodiment, the elastic support structure has multiple implementation manners. In the present invention, the following specific implementation manners are provided. The first implementation manner: referring to Figure 1-4, The elastic support structure includes two elastic support rings 7 and an elastic connection part 8. The elastic support rings 7 are annular. The two elastic support rings 7 are located at both ends of the elastic connection part 8 and are respectively connected to the corresponding ends of the elastic connection part 8. When the elastic support structure is installed in the installation area 6, the two elastic support rings 7 and the elastic connection part 8 are clamped between the first part 4 and the second part 5. The elastic support rings 7 and the elastic connection part 8 are of an integral structure and are made of a material with good elasticity such as silica gel or rubber. By adopting the elastic support structure with the aforementioned structure, the annular elastic support rings 7 are located on both sides of the seat cushion assembly, that is, on both sides of the user's buttocks and legs, which can increase the amplitude of elastic movement of the first part 4, provide a better elastic support effect for the user, fit the shape of the human buttocks better, and make the sitting posture more comfortable; in addition, see Figure 3-4 , A first assembly groove 9 is provided in the first part 4, and a second assembly groove 10 is provided in the second part 5. The first protrusion 11 and the second protrusion 12 can be provided on both the two elastic support rings 7 and the elastic connection part 8 at the same time, or the first protrusion 11 and the second protrusion 12 can be provided on only one or two of the two elastic support rings 7 and the elastic connection part 8. The first protrusion 11 is inserted into the first assembly groove 9, and the second protrusion 12 is inserted into the second assembly groove 10. Specifically, in this embodiment, the first protrusion 11 and the second protrusion 12 are provided on both the two elastic support rings 7 and the elastic connection part 8 at the same time. The first protrusions 11 on the two elastic support rings 7 and the elastic connection part 8 are sequentially connected to form a continuous first convex rib, and the second protrusions 12 on the two elastic support rings 7 and the elastic connection part 8 are sequentially connected to form a continuous second convex rib. The entire first convex rib is inserted into the first assembly groove 9 on the first part 4, and the entire second convex rib is inserted into the second assembly groove 10 on the second part 5, so that the elastic support structure is firmly installed between the first part 4 and the second part 5; in addition, both sides of the first part 4 are in an upwardly inclined state 13, and a part of the installation area 6 is located between the inclined part of the first part 4 and the second part 5, so that a part of the installation area 6 is in an inclined state. Specifically, the part of the installation area 6 for installing the elastic support ring 7 is located between the inclined part of the first part 4 and the second part 5, so that the elastic support ring 7 is in an inclined state from bottom to top and from inside to outside. Through this structure, the user's buttocks and thighs can avoid the edge of the seat cushion frame 1, avoiding discomfort for the user.

[0049] The second implementation manner of the elastic support structure: See Figure 5, the elastic support structure may include a plurality of springs. The plurality of springs are arranged at intervals in the installation area 6 and are clamped between the first part 4 and the second part 5. The positioning connection of the springs between the first part 4 and the second part 5 can be achieved by respectively arranging assembly grooves on the first part 4 and the second part 5, so that one end of the spring is connected in the assembly groove on the first part 4 and the other end is connected in the assembly groove on the second part 5. Also, both sides of the first part 4 are in an upwardly inclined state, and a part of the installation area 6 is located between the inclined part of the first part 4 and the second part 5, so that a part of the installation area 6 is in an inclined state. Specifically, the part of the installation area 6 for installing some springs is located between the inclined part of the first part 4 and the second part 5, so that this part of the springs is in an inclined state from bottom to top and from inside to outside.

[0050] The third implementation manner of the elastic support structure: Refer to Figure 6 , the elastic support structure may include a plurality of elastic pieces. The plurality of elastic pieces are arranged at intervals in the installation area 6 and are clamped between the first part 4 and the second part 5. The positioning connection of the elastic pieces between the first part 4 and the second part 5 can be achieved by connecting one end of it to the first part 4 and the other end to the second part 5. The connection method can adopt detachable connection with fasteners such as bolts, so that one end of the spring is connected in the assembly groove on the first part 4 and the other end is connected in the assembly groove on the second part 5. Also, both sides of the first part 4 are in an upwardly inclined state, and a part of the installation area 6 is located between the inclined part of the first part 4 and the second part 5, so that a part of the installation area 6 is in an inclined state. Specifically, the part of the installation area 6 for installing some springs is located between the inclined part of the first part 4 and the second part 5, so that this part of the springs is in an inclined state from bottom to top and from inside to outside.

[0051] In a preferred embodiment, the seat includes a backrest assembly. The backrest assembly is connected to the base 2 through a lifting adjustment assembly 14. By means of the lifting adjustment assembly 14, the backrest assembly is caused to move up and down relative to the seat cushion assembly, so that the height of the backrest assembly can be adjusted according to the height of the user, providing better support for the user. The backrest assembly can be a whole, that is, it has both a lumbar support part and a back support part. It is only necessary to connect the lifting adjustment assembly 14 to the whole backrest assembly. The backrest assembly can also be formed independently by a lumbar support assembly 15 and a back support assembly 16 respectively and connected by a first connecting member 17. Specifically, the seat further includes a second connecting member 18. The lifting adjustment assembly 14 is arranged between the first connecting member 17 and the second connecting member 18. The second connecting member 18 is also connected to the base 2. By means of the lifting adjustment assembly 14, the first connecting member 17 is caused to drive the back support assembly 16 and the lumbar support assembly 15 to move up and down synchronously.In this embodiment, the lifting and adjusting assembly 14 includes a fixing member 19, a fixing seat 20, an elastic member 21 and a gear member 22. The fixing member 19 can be directly connected to the backrest assembly or indirectly connected to the backrest assembly through the first connecting member 17. In this embodiment, the fixing member 19 is indirectly connected to the backrest assembly through the first connecting member 17. The fixing seat 20 can be directly connected to the base 2 or indirectly connected to the base 2 through the second connecting member 18. In this embodiment, the fixing seat 20 is indirectly connected to the base 2 through the second connecting member 18. The gear member 22 is rotatably connected to the fixing seat 20. The fixing member 19 is sleeved around the fixing seat 20 and can slide relative to it. The sliding direction is in the seat height direction. A gear rack 23 is provided on one inner side wall of the fixing member 19, and an engaging tooth 24 is provided on one side wall of the gear member 22. The engaging tooth 24 of the gear member 22 meshes with the gear rack 23 on the fixing member 19. The elastic member 21 is disposed between the gear member 22 and the fixing seat 20. The elastic member 21 urges the engaging tooth 24 on the gear member 22 to mesh with the gear rack 23 on the fixing member 19. By moving the backrest assembly up and down, the user can overcome the elastic force of the elastic member 21, thereby driving the fixing member 19 to reciprocate relative to the fixing seat 20 in its length direction. The pre-tightening force generated by the elastic member 21 urges the gear member 22 to always have a tendency to move towards the gear rack 23. When the engaging tooth 24 corresponds to any tooth groove on the gear rack 23, the gear member 22 moves towards the gear rack 23 on the fixing member 19 under the action of the elastic member 21, and the engaging tooth 24 meshes in the gear rack 23 to position the fixing member 19. When it is necessary to unlock the gear member 22, only by moving the backrest assembly, the gear rack 23 in the fixing member 19 is forced to squeeze the engaging tooth 24 on the gear member 22, forcing it to rotate away from the gear rack 23 and disengage from the gear rack 23, while compressing the elastic member 21. When the fixing member 19 moves up and down to make the next tooth groove on the gear rack 23 opposite to the engaging tooth 24, the engaging tooth 24 meshes with the gear rack 23 again under the action of the elastic member 21 to stabilize the backrest assembly at this height. There is at least one set of lifting and adjusting assemblies 14. When there is only one set, the lifting and adjusting assembly 14 can be disposed between the middle of the first connecting member 17 and the middle of the second connecting member 18, or two sets can be used, symmetrically disposed on the first connecting member 17 and also located between the first connecting member 17 and the second connecting member 18.

[0052] In a preferred embodiment, referring to Figures 13-1 to 13-3, a first limiting wall 25 is provided in the fixing base 20, and first strip-shaped holes 26 are respectively provided on two opposite side walls of the fixing base 20. The lifting and adjusting assembly 14 further includes a first rotating shaft 27. The gear member 22 is sleeved on the first rotating shaft 27. Two ends of the first rotating shaft 27 respectively extend into the first strip-shaped holes 26 at the corresponding ends, and the first rotating shaft 27 can reciprocate in the first strip-shaped holes 26 under the action of the fixing member 19. In the first state, the first rotating shaft 27 is located at the first end 31 at the lower part of the first strip-shaped hole 26. The gear member 22 is disengaged from the first limiting wall 25. Under the action of the elastic member 21, the engaging teeth 24 on the gear member 22 are engaged with the gear rack 23 on the fixing member 19, and the lumbar support assembly 15 is in an adjustable height state. In the second state, the first rotating shaft 27 is located at the second end 32 at the upper part of the first strip-shaped hole 26. The gear member 22 contacts the first limiting wall 25 to limit the engaging teeth 24 on the gear member 22 from engaging with the gear rack 23 on the fixing member 19, and the lumbar support assembly 15 is in a state where it can fall back to the lowest gear. Specifically, a first groove 28 is provided on the inner side wall of the fixing member 19. The first groove 28 is opposite to the gear rack 23. A third protrusion 29 is provided on the gear member 22. A first through hole 30 for the third protrusion 29 of the gear member 22 to pass through is provided on the fixing base 20. The third protrusion 29 on the gear member 22 passes through the first through hole 30 on the fixing base 20 and then extends into the first groove 28 on the fixing member 19. Each tooth groove on the gear rack 23 corresponds to a height gear. When the backrest assembly is at one of the height gears, if the user needs to raise the backrest assembly, in this state, the gear member 22 is disengaged from the first limiting wall 25. Under the action of the elastic member 21, the engaging teeth 24 thereon are engaged with the gear rack 23, and the first rotating shaft 27 is located at the lower end (which can also be called the "first end 31") in the first strip-shaped hole 26. The third protrusion 29 retracts into the fixing base 20 and disengages from the first groove 28 on the fixing member 19. By lifting the backrest assembly upward, the backrest assembly drives the first connecting member 17 to move upward, and the first connecting member 17 drives the fixing member 19 to move upward. At this time, the teeth in the gear rack 23 on the fixing member 19 push the gear member 22 to rotate, so as to force the engaging teeth 24 on the gear member 22 to disengage from the tooth grooves on the gear rack 23, and at the same time compress the elastic member 21. After the fixing member 19 moves to a suitable height with the backrest assembly, the gear member 22 returns under the elastic action of the elastic member 21 to make the engaging teeth 24 engage with the tooth groove on the gear rack 23 opposite thereto, so as to fix the height of the backrest assembly;If the user needs to lower the backrest assembly, the backrest assembly needs to be first reset to the lowest position and then adjusted to the required height according to the above operation. Specifically, continuously lift the backrest assembly to continuously raise the first groove 28 on the fixing member 19. During the process of the backrest assembly rising to the highest position, the gear member 22 is affected by the teeth in the gear rack 23, causing the engaging teeth 24 on the gear member 22 to continuously remain in a state of disengaging from the gear rack 23. At this time, the third protrusion 29 on the gear member 22 passes through the first through hole 30 on the fixing seat 20 and extends into the first groove 28 until the first end wall 66 located below in the first groove 28 contacts the third protrusion 29 and drives the gear member 22 to move upward, so that the first rotating shaft 27 moves to the upper end (which can also be called the "second end 32") in the first elongated hole 26. At this time, the gear member 22 contacts the first limiting wall 25, and the first limiting wall 25 restricts the gear member 22 from rotating under the action of the elastic member 21, so that the engaging teeth 24 on the gear member 22 and the gear rack 23 on the fixing member 19 always remain in a disengaged state. In this state, the backrest assembly can fall back to the lowest position. At this time, the second end wall 67 located above in the first groove 28 on the fixing member 19 contacts the third protrusion 29 of the gear member 22. Subsequently, when raising the backrest assembly from the lowest position, it is necessary to first push the backrest assembly downward to press the second end wall in the first groove 28 on the fixing member 19 against the third protrusion 29 on the gear member 22, so that the gear member 22 and the first rotating shaft 27 move down to the first end 31 of the first elongated hole 26. At this time, the gear member 22 disengages from the first limiting wall 25. Since the gear member 22 is no longer restricted by the first limiting wall 25, under the action of the elastic member 21, it can cause the engaging teeth 24 on the gear member 22 to be engaged into the tooth groove corresponding to the first gear position 33 in the gear rack 23 on the fixing member 19. At this time, the backrest assembly can be normally raised. In addition, in this embodiment, the teeth on the gear rack 23 have a first side wall 34 and a second side wall 35. The first side wall 34 is in a planar state and can contact the upper surface of the engaging teeth 24 on the gear member 22 to prevent the fixing member 19 from slipping with the backrest assembly and being unable to effectively fix the height of the backrest assembly. The second side wall 35 is in an inclined plane and can contact the lower surface (this lower surface is an inclined plane) of the engaging teeth 24 on the gear member 22. When the backrest assembly is lifted upward, it is convenient for the gear rack 23 to push the gear member 22 to rotate around the first rotating shaft 27.;

[0053] In a preferred embodiment, the backrest assembly includes a back support assembly 16 and a lumbar support assembly 15. The back support assembly 16 and the lumbar support assembly 15 are connected by a first connecting member 17. The first connecting member 17 includes a first connection end 36, a second connection end 37, a third connection end 38, and a fourth connection end 39. The first connection end 36 and the second connection end 37 are respectively disposed on both sides of the lumbar support assembly 15 and connected thereto. The third connection end 38 and the fourth connection end 39 are respectively disposed on both sides of the back support assembly 16 and connected thereto. Specifically, a first fine adjustment assembly 40 may be provided between the first connection end 36 of the first connecting member 17 and the lumbar support assembly 15 or between the second connection end 37 of the first connecting member 17 and the lumbar support assembly 15. Alternatively, the first fine adjustment assembly 40 may be provided both between the first connection end 36 of the first connecting member 17 and the lumbar support assembly 15 and between the second connection end 37 of the first connecting member 17 and the lumbar support assembly 15. By connecting the respective connection ends on the first connecting member 17 to both sides of the back support assembly 16 or to both sides of the lumbar support assembly 15 and providing the first fine adjustment assembly 40 at the connection points, when the user's lumbar and back move, the lumbar support assembly 15 or the back support assembly 16 can generate corresponding slight swings to adapt to the lumbar and back positions of the user after adjusting the posture, making the backrest assembly fit the user's lumbar and back better and providing a better sense of comfort during use.

[0054] In the preferred embodiment, the connection points of the first connection end 36 and the second connection end 37 with the lumbar support assembly 15 are located on the horizontal center line of the lumbar support assembly 15. The connection points of the third connection end 38 and the fourth connection end 39 with the back support assembly 16 are located on the horizontal center line of the back support assembly 16. This can enable the lumbar support assembly 15 or the back support assembly 16 to generate small swings better following the movement of the user's lumbar and back, thus fitting the user's lumbar and back better, providing a better sense of comfort during use, and having a better support effect on the lumbar and back.

[0055] In this embodiment, refer to Figure 14, the first micro-adjustment component 40 includes a gear switch 41, a movable member 42 that can move elastically and cooperates with the gear switch 41, and a first fixing component; the gear switch 41 and the movable member 42 are arranged on the first connecting member 17 or the lumbar support component 15, that is, the gear switch 41 and the movable member 42 can be arranged on the first connecting member 17 at the same time, or can be arranged on the lumbar support component 15 at the same time. The specific implementation shown in this embodiment is arranged on the first connecting member 17; the first connecting member 17 and the lumbar support component 15 are connected by connecting with the movable member 42 through the first fixing component. When the gear switch 41 and the movable member 42 are arranged on the first connecting member 17, the first fixing component is arranged on the lumbar support component 15. By adjusting the gear switch 41, the movable member 42 is unlocked or locked, and by squeezing or loosening the lumbar support component 15, the movable member 42 is driven to reciprocate in the horizontal direction. Through the first micro-adjustment component 40, the lumbar support component 15 can be adjusted to reciprocate in the direction close to or away from the user's waist, so as to adapt to the user's waist position and better support the user's waist. In addition, since the lumbar support component 15 and the back support component 16 are connected by the first connecting member 17, after adjusting the distance of the lumbar support component 15 relative to the user's waist through the first micro-adjustment component 40, the back support component 16 can be driven to move in the same direction through the first connecting member 17, so that the back support component 16 can adaptively adjust the distance relative to the user's back, thereby realizing the synchronous movement of the lumbar support component 15 and the back support component 16, providing a better support effect for the user's waist and back and better comfort.

[0056] In this embodiment, specific implementation manners of various connection methods of the first micro-adjustment component 40 are provided. The first implementation manner: Refer to Figures 14-17, an installation cylinder 43 is provided on the first connecting member 17. In this embodiment, the through hole inside the installation cylinder 43 axially penetrates both ends of the installation cylinder 43, and a baffle 44 is arranged inside its through hole. The gear shift switch 41 is located inside the installation cylinder 43. Specifically, the gear shift switch 41 has a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence. The first connecting portion penetrates through the baffle 44 and is connected to the decorative operation cover 45 installed in the through hole. One end of the second connecting portion is connected to the first connecting portion, and the other end is connected to the third connecting portion. A plurality of convex plates 46 are arranged at intervals on the side wall of the second connecting portion, and the spring 47 is sleeved on these convex plates 46, so as to reduce the contact area between the spring 47 and the gear shift switch 41 and avoid large friction between the gear shift switch 41 and the elasticity when the gear shift switch 41 rotates. The third connecting portion extends into the moving member 42. A plurality of first limiting protrusions 48 are arranged at intervals along the axial direction of the third connecting portion. At least one second limiting protrusion 49 is arranged at intervals along the axial direction inside the moving member 42. Or a plurality of first limiting protrusions 48 are arranged at intervals along the axial direction of the third connecting portion, and a plurality of second limiting protrusions 49 are arranged at intervals along the axial direction inside the moving member 42. Or it can also be that a plurality of first limiting protrusions 48 are arranged at intervals along the axial direction of the third connecting portion, and a plurality of second limiting protrusions 49 are arranged at intervals along the axial direction inside the moving member 42. All of them can realize the limiting of the moving member 42 and the gear shift switch 41. Specifically, when the gear shift switch 41 rotates until the first limiting protrusion 48 disengages from the second limiting protrusion 49, it can also be understood that when the first limiting protrusion 48 and the second limiting protrusion 49 are axially misaligned and no longer engage, the lumbar support assembly 15 can be squeezed or relaxed, so as to promote the moving member 42 to compress or loosen the spring 47. When the lumbar support assembly 15 is adjusted to a suitable position, continue to rotate the gear shift switch 41 to make the first limiting protrusion 48 on the three parts engage with the second limiting protrusion 49 inside the moving member 42 again, so as to prevent the lumbar support assembly 15 from moving and keep it in the required position; at least part of the moving member 42 is located inside the installation cylinder 43. Specifically, the part of the moving member 42 assembled with the gear shift switch 41 is located inside the installation cylinder 43, such as Figure 17As shown, the part for extruding the first soft rubber 50 is located outside the mounting cylinder 43. The part on the moving member 42 for extruding the first soft rubber 50 includes a disc-shaped extrusion end 51. A hollow first connecting column 52 is provided inside the extrusion end 51. The first connecting column 52 penetrates through the first soft rubber 50 and is connected to the first fixing assembly, and the extrusion end 51 contacts the first soft rubber 50. A first mounting groove 53 is provided on the waist support assembly 15. The first soft rubber 50 is arranged in the first mounting groove 53. A part of the moving member 42 passes through the first soft rubber 50 and is connected to the part of the first fixing assembly that penetrates through the first mounting groove 53. Specifically, the first fixing assembly includes a first connecting threaded member 54 and a first gasket 55. The first connecting threaded member 54 penetrates through the first gasket 55 and the first mounting groove 53 and then is screwed into the first connecting column 52 of the moving member 42 to connect the first connecting member 17 to the waist support assembly 15. A spring 47 sleeved on the gear switch 41 is arranged in the mounting cylinder 43. One end of the spring 47 abuts against the end of the mounting cylinder 43, that is, against the baffle 44 inside the mounting cylinder 43, and the other end abuts against the end of the moving member 42. Since the first soft rubber 50 is provided between the first connecting member 17 and the waist support assembly 15, when the user sits on the seat and adjusts the posture and moves the waist and back, the waist support assembly 15 can swing correspondingly with the continuously changing acting forces applied during the movement of the user, so that the waist support assembly 15 can better fit the human waist, provide a better support effect, and be more comfortable to use. The second implementation mode: The difference from the first implementation mode is that the positions of the mounting cylinder 43 and the first mounting groove 53 are interchanged, that is, the mounting cylinder 43 is arranged on the waist support assembly 15, and the first mounting groove 53 is arranged on the first connecting member 17. The rest of the structures refer to the first implementation mode and will not be elaborated here. The third implementation mode: See Figures 19-20, an installation cylinder 43 is provided on the first connecting member 17. In this embodiment, the blind hole inside the installation cylinder 43 is arranged along the axial direction of the installation cylinder 43, and a through hole 84 is provided on the installation cylinder 43. The handle 85 of the gear shift switch 41 passes through the through hole 84, and the positioning engagement portion 86 of the gear shift switch 41 is eccentrically rotatably connected in the through hole. Specifically, the gear shift switch 41 includes a handle 85 and a positioning engagement portion 86 connected to the handle 85. Engaging teeth are provided on the positioning engagement portion 86 of the gear shift switch. In addition, an eccentric shaft is provided on the positioning engagement portion 86 and is rotatably connected in the through hole 84 through the eccentric shaft; at least a part of the moving member 42 is located inside the installation cylinder 43. Specifically, the part of the moving member 42 assembled with the gear shift switch 41 is located inside the installation cylinder 43, while the part for extruding the first soft rubber 50 is located outside the installation cylinder 43. The part of the moving member 42 for extruding the first soft rubber 50 includes a disc-shaped extrusion end portion 51. A hollow first connecting column 52 is arranged inside the extrusion end portion 51. The first connecting column 52 penetrates through the first soft rubber 50 and is connected to the first fixing assembly, and the extrusion end portion 51 contacts the first soft rubber 50; a first installation groove 53 is provided on the lumbar support assembly 15, and the first soft rubber 50 is arranged in the first installation groove 53. A part of the moving member 42 passes through the first soft rubber 50 and is connected to the part of the first fixing assembly penetrating through the first installation groove 53. Specifically, the first fixing assembly includes a first connecting threaded member 54 and a first gasket 55. The first connecting threaded member 54 penetrates through the first gasket 55 and the first installation groove 53 and then is screwed into the first connecting column 52 of the moving member 42 to connect the first connecting member 17 with the lumbar support assembly 15; a spring 47 is arranged inside the installation cylinder 43. One end of the spring 47 abuts against the end of the blind hole of the installation cylinder 43, and the other end abuts against the end of the moving member 42. The cross-section of the part of the moving member 42 located inside the installation cylinder 43 is arc-shaped, and the three-dimensional shape is formed by a plane and an arc-shaped surface. A tooth surface 87 meshing with the engaging teeth on the gear shift switch 41 is arranged along the axial direction on this plane. By rotating the gear shift switch 41, the engaging teeth on the positioning engagement portion 86 engage with or disengage from the tooth surface 87 on the moving member 42 under eccentric movement to lock or unlock the moving member and keep it in the required position, so as to fix the position of the lumbar support assembly 15; since the first soft rubber 50 is provided between the first connecting member 17 and the lumbar support assembly 15, when the user sits on the seat and adjusts the posture and moves the waist and back, the lumbar support assembly 15 can swing correspondingly with the continuously changing acting forces applied during the movement of the user, so that the lumbar support assembly 15 can better fit the human waist, provide a better support effect and be more comfortable to use. The fourth implementation manner: The difference from the third implementation manner is that the positions of the installation cylinder 43 and the first installation groove 53 are interchanged, that is, the installation cylinder 43 is arranged on the lumbar support assembly 15, and the first installation groove 53 is arranged on the first connecting member 17. The rest of the structures refer to the third implementation manner and will not be elaborated here.Among them, the structure of the third implementation method is simpler, the operation is more convenient, and the practicability is stronger.

[0057] In the preferred embodiment, referring to Figures 8-9 , a second micro-motion adjustment component is provided between the third connection end 38 of the first connecting member 17 and the back support assembly 16 and between the fourth connection end 39 of the first connecting member 17 and the back support assembly 16; the structure of the second micro-motion adjustment component adopted by at least one of the third connection end 38 of the first connecting member 17 and the back support assembly 16 and between the fourth connection end 39 of the first connecting member 17 and the back support assembly 16 is as follows: the second micro-motion adjustment component includes a second soft rubber 56 and a second fixing component. The second soft rubber 56 is arranged between the first connecting member 17 and the back support assembly 16. Specifically, the second soft rubber 56 is arranged between the third connection end 38 of the first connecting member 17 and the back support assembly 16 and between the fourth connection end 39 of the first connecting member 17 and the back support assembly 16. A part of the first connecting member 17 passes through the second soft rubber 56 and is connected to a part of the second fixing component that penetrates the back support assembly 16. That is, second connecting columns 57 are respectively arranged at the third connection end 38 and the fourth connection end 39 of the first connecting member 17. The second fixing component includes a second connecting threaded part 58 and a second gasket. The second connecting threaded part 58 in the second fixing component penetrates the second gasket and the back support assembly 16 and then is screwed into the inside of the second connecting column 57 to connect the first connecting member 17 and the back support assembly 16 and clamp the second soft rubber 56 between the first connecting member 17 and the back support assembly 16; alternatively, the second connecting column 57 can be arranged on the back support assembly 16, and the second connecting threaded part 58 of the second fixing component penetrates the second gasket and the first connecting member 17 and then is screwed into the corresponding second connecting column 57 on the back support assembly 16. By providing the second soft rubber 56, when the user sits on the seat and adjusts the posture and moves the waist and back, the back support assembly 16 can swing correspondingly with the continuously changing acting force exerted during the movement of the user, so that the back support assembly 16 can better fit the human back, provide a better support effect, and be more comfortable to use. Through the combined action of the first micro-motion adjustment component 40, the second micro-motion adjustment component and the first connecting member 17, the entire backrest component can be made to generate corresponding micro-motions following the activities of the user's waist and back, so as to always fit the user's waist and back, provide a better support effect, and have a better sense of comfort.

[0058] In the preferred embodiment, referring to Figure 9 and 18, the seat further includes a headrest assembly 59 which is located above the backrest assembly. The headrest assembly 59 is connected to a third connecting member 60. The third connecting member 60 is rotatably connected to the second connecting member 18. The second connecting member 18 is connected to the base 2 and is also connected to the first connecting member 17. The third connecting member 60 includes a fifth connection end 61, a sixth connection end 62 and a seventh connection end 63. The fifth connection end 61 is rotatably connected to the second connecting member 18. The sixth connection end 62 and the seventh connection end 63 are respectively arranged on both sides of the headrest assembly 59 and are connected thereto. The connection points of the sixth connection end 62 and the seventh connection end 63 with the headrest assembly 59 are located on the horizontal center line of the headrest assembly 59. Since the sixth connection end 62 and the seventh connection end 63 of the third connecting member 60 are connected to both sides of the headrest assembly 59 and the connection points are located on the horizontal center line of the headrest assembly 59, the headrest assembly 59 can swing slightly better with the movement of the user's head and neck, so as to better fit the rear side of the user's head and neck, with better comfort and better support for the head and neck.

[0059] In a preferred embodiment, a third fine adjustment assembly is provided between the sixth connection end 62 of the third connection member 60 and the headrest assembly 59 and between the seventh connection end 63 of the third connection member 60 and the headrest assembly 59; the structure of the third fine adjustment assembly adopted for at least one of the two between the sixth connection end 62 of the third connection member 60 and the headrest assembly 59 and between the seventh connection end 63 of the third connection member 60 and the headrest assembly 59 is as follows: the third fine adjustment assembly includes a third soft rubber 64 and a third fixing assembly. The third soft rubber 64 is disposed between the third connection member 60 and the headrest assembly 59. A part of the third connection member 60 passes through the third soft rubber 64 and is connected to a part of the third fixing assembly that penetrates the headrest assembly 59. The third connection member 60 is connected to the headrest assembly 59 through the third fixing assembly, and the third soft rubber 64 is clamped between the third connection member 60 and the headrest assembly 59. Specifically, the third soft rubber 64 is disposed between the sixth connection end 62 of the third connection member 60 and the headrest assembly 59 and between the seventh connection end 63 of the third connection member 60 and the headrest assembly 59. A part of the third connection member 60 passes through the third soft rubber 64 and is connected to a part of the third fixing assembly that penetrates the headrest assembly 59. That is, third connection columns are respectively provided at the sixth connection end 62 and the seventh connection end 63 of the third connection member 60. The third fixing assembly includes a third connection threaded member and a third gasket. The third connection threaded member in the third fixing assembly penetrates the third gasket and the headrest assembly 59 and then is screwed into the inside of the third connection column to connect the third connection member 60 to the headrest assembly 59 and clamp the third soft rubber 64 between the third connection member 60 and the headrest assembly 59; alternatively, the third connection column may be provided on the headrest assembly 59, and the third connection threaded member of the third fixing assembly penetrates the third gasket and the third connection member 60 and then is screwed into the corresponding third connection column on the headrest assembly 59. By providing the third soft rubber 64, when a user sits on the seat and adjusts the posture and moves the head and neck, the headrest assembly 59 can swing correspondingly with the continuously changing acting force applied when the user's head and neck move, so that the headrest assembly 59 can better fit the back side of the head and neck, provide a better support effect, and be more comfortable to use. Through the combined action of the first fine adjustment assembly 40, the second fine adjustment assembly, the third fine adjustment assembly, the first connection member 17, the second connection member 18, and the third connection member 60, the entire backrest assembly and the headrest assembly 59 can be made to generate corresponding fine movements following the movements of the user's lumbar and dorsal regions and the head and neck, so as to always fit the user's lumbar and dorsal regions and the head and neck, provide a better support effect, and have a better sense of comfort.

[0060] In this embodiment, referring to Figure 1, the seat further includes two armrest assemblies 68, which are respectively arranged on both sides of the seat cushion assembly. Each armrest assembly 68 can be connected to the seat cushion assembly or to the base 2. The armrest assembly 68 can be a fixed structure, that is, the position or angle cannot be adjusted, etc. However, in order to improve the comfort of the seat, the armrest assembly 68 can be set as a structure with adjustable position or angle. The armrest assembly 68 in the present utility model can adopt the prior art, and by setting the armrest assembly 68, the arms of the user can be supported to improve the comfort of use.

[0061] In addition, in this embodiment, referring to Figure 1 and Figure 8 , a sacral support assembly 65 is provided below the backrest assembly. The sacral support assembly 65 is used to support the sacral position of the user. The sacral support assembly 65 can be connected to the backrest assembly, or to the seat cushion assembly or the base 2. Specifically, the sacral support assembly 65 is arranged below the lumbar support assembly 15 of the backrest assembly. An installation groove matching the shape of the sacral support assembly 65 is provided at the bottom of the lumbar support assembly 15, and the sacral support assembly 65 is arranged in this installation groove.

[0062] Furthermore, the headrest assembly 59, the lumbar support assembly 15, and the back support assembly 16 can adopt the prior art, that is, they are formed by a frame and a soft pad or a mesh surface.

[0063] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A seat cushion assembly, comprising a seat cushion frame, characterized in that : The seat cushion frame includes a first part and a second part. The first part and the second part are connected, and in the supporting direction, the first part is located above the second part. At least a part between the first part and the second part is separated. When the first part is stressed, the first part can elastically move relative to the second part.

2. The seat cushion assembly according to claim 1, wherein: A part between the first part and the second part is connected and a part is separated, so that at the separated part between the first part and the second part, the first part is in a suspended state relative to the second part. The seat cushion frame is made of metal or plastic.

3. The seat cushion assembly according to claim 1 or 2, characterized in that: The position where the first part and the second part are separated forms an installation area, and an elastic support structure is arranged in the installation area.

4. The seat cushion assembly according to claim 3, wherein: The elastic support structure includes two elastic support rings and an elastic connection part. The two elastic support rings are located at both ends of the elastic connection part and are respectively connected to the corresponding ends of the elastic connection part. When the elastic support structure is installed in the installation area, the two elastic support rings and the elastic connection part are clamped between the first part and the second part. Alternatively, the elastic support structure includes a plurality of springs or a plurality of elastic sheets. The plurality of springs or the plurality of elastic sheets are arranged at intervals in the installation area and are clamped between the first part and the second part.

5. The seat cushion assembly according to claim 4, wherein: A first assembly groove is provided in the first part, a second assembly groove is provided in the second part, and a first protrusion and a second protrusion are provided on the two elastic support rings and / or the elastic connection part. The first protrusion is inserted into the first assembly groove, and the second protrusion is inserted into the second assembly groove.

6. The seat cushion assembly according to claim 3, wherein: Both sides of the first part are in an upwardly inclined state, and a part of the installation area is located between the inclined part of the first part and the second part, so that a part of the installation area is in an inclined state.

7. A seat, characterized in that: It includes a seat cushion assembly, a backrest assembly and a base as described in any one of claims 1-6. The seat cushion assembly is connected to the base, and the backrest assembly is connected to the seat cushion assembly or connected to the base.

8. The seat according to claim 7, wherein: The backrest assembly includes a back support assembly and a waist support assembly. The back support assembly and the waist support assembly are connected by a first connecting member. The first connecting member includes a first connecting end, a second connecting end, a third connecting end and a fourth connecting end. The first connecting end and the second connecting end are respectively arranged on both sides of the waist support assembly and are connected thereto. The third connecting end and the fourth connecting end are respectively arranged on both sides of the back support assembly and are connected thereto. The connection points of the first connecting end and the second connecting end with the waist support assembly are located on the horizontal center line of the waist support assembly. Alternatively, the connection points of the third connecting end and the fourth connecting end with the back support assembly are located on the horizontal center line of the back support assembly.

9. The seat according to claim 8, characterized in that: A first micro-adjustment assembly is provided between the first connection end of the first connecting member and the lumbar support assembly and / or between the second connection end of the first connecting member and the lumbar support assembly; the first micro-adjustment assembly includes a gear switch, a movable member that can elastically move and cooperate with the gear switch, and a first fixing assembly. The gear switch and the movable member are arranged on the first connecting member or the lumbar support assembly, and are connected to the movable member through the first fixing assembly to connect the first connecting member and the lumbar support assembly. The movable member is unlocked or locked by adjusting the gear switch, and the movable member is driven to reciprocate horizontally by squeezing or loosening the lumbar support assembly.

10. The seat according to claim 9, characterized in that: An installation cylinder is provided on the first connecting member, the gear switch is connected to the installation cylinder, at least a part of the movable member is located in the installation cylinder, a first installation groove is provided on the lumbar support assembly, a first soft rubber is arranged in the first installation groove, a part of the movable member passes through the first soft rubber and is connected to a part of the first fixing assembly that penetrates the first installation groove. A spring sleeved on the gear switch is arranged in the installation cylinder, one end of the spring abuts against the end of the installation cylinder, and the other end abuts against the end of the movable member; Alternatively, an installation cylinder is provided on the lumbar support assembly, the gear switch is connected to the installation cylinder, at least a part of the movable member is also located in the installation cylinder, a first installation groove is provided on the first connecting member, a first soft rubber is arranged in the first installation groove, a part of the movable member passes through the first soft rubber and is connected to a part of the first fixing assembly that penetrates the first installation groove. A spring sleeved on the gear switch is arranged in the installation cylinder, one end of the spring abuts against the end of the installation cylinder, and the other end abuts against the end of the movable member.

11. The seat according to any one of claims 8-10, characterized in that: A second micro-adjustment assembly is provided between the third connection end of the first connecting member and the back support assembly and / or between the fourth connection end of the first connecting member and the back support assembly; The second micro-adjustment assembly includes a second soft rubber and a second fixing assembly. The second soft rubber is arranged between the first connecting member and the back support assembly. A part of the first connecting member passes through the second soft rubber and is connected to a part of the second fixing assembly that penetrates the back support assembly. The first connecting member and the back support assembly are connected through the second fixing assembly, and the second soft rubber is clamped between the first connecting member and the back support assembly; or, the second micro-adjustment assembly includes a second soft rubber and a second fixing assembly. The second soft rubber is arranged between the first connecting member and the back support assembly. A part of the back support assembly passes through the second soft rubber and is connected to a part of the second fixing assembly that penetrates the first connecting member. The first connecting member and the back support assembly are connected through the second fixing assembly, and the second soft rubber is clamped between the first connecting member and the back support assembly.

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