Seat

Abstract

The utility model relates to the technical field of furniture supplies, and particularly discloses a seat, which comprises a waist support component connected to a cushion component or a base through a connecting component. The connecting assembly comprises a first connecting end and a second connecting end, and the first connecting end and the second connecting end are arranged on the two sides of the waist supporting assembly respectively and movably connected with the waist supporting assembly. The waist of a user is supported through the waist supporting assembly, the connecting ends on the connecting assembly are connected to the two sides of the waist supporting assembly, and the first connecting end and the second connecting end are movably connected with the connecting points of the waist supporting assembly respectively, so that when the waist and the back of the user move, the waist and the back of the user can be supported; and the waist supporting assembly swings correspondingly to adapt to the waist and back position of the user after posture adjustment, so that the waist supporting assembly better fits the waist of the user, and the use comfort is better.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture, in particular to a seat. 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. When people are working or studying, they usually need to sit at a desk for a long time continuously. Existing office chairs, gaming chairs or household chairs generally include a seat cushion assembly and a backrest assembly. Among them, the seat cushion assembly is used to support the human buttocks, and the backrest assembly is used to support the human waist and back. However, for the existing backrest assembly, its waist support part and back support part are either integrated structures, or the waist support part and the back support part are formed separately and then connected into one body through a connecting piece to form the backrest assembly. No matter which way the backrest assembly adopts, its waist support part adopts a fixed structure. Therefore, when the user sits on the seat and moves the waist and back, the waist support part cannot adjust its own state appropriately with the movement of the user's waist and back to always fit the user's waist, thus unable to provide good support for the human waist. As a result, after the user adjusts the sitting posture, at least part of the user's waist is separated from the backrest assembly. Without support, it will cause discomfort to the user in the sitting posture, and it is easy to feel fatigue, which is not conducive to health. Summary of the Utility Model

[0003] The utility model aims to solve the technical problems existing in the above-mentioned prior art, and provides a seat to make the user feel comfortable in the sitting posture.

[0004] To solve the above technical problems, the utility model provides the following technical solutions:

[0005] A seat according to the utility model includes a waist support assembly, and the waist support assembly is connected to the seat cushion assembly or the base through a connection assembly; the connection assembly includes a first connection end and a second connection end, and the first connection end and the second connection end are respectively arranged on both sides of the waist support assembly and are movably connected to the waist support assembly.

[0006] For the seat according to the utility model, the waist of the user is supported by the waist support assembly. By connecting the connection ends on the connection assembly to both sides of the waist support assembly, and the connection points between the first connection end and the second connection end and the waist support assembly adopt movable connections respectively, when the user's waist and back move, the waist support assembly can generate corresponding swings to adapt to the position of the user's waist and back after adjusting the posture, so that the waist support assembly fits the user's waist better and the use comfort is better.

[0007] Further, the connection points of the first connection end and the second connection end with the lumbar support assembly are located on the horizontal center line of the lumbar support assembly.

[0008] Further, a first fine adjustment assembly is provided between the first connection end and the lumbar support assembly and / or between the second connection end and the lumbar support assembly; the first fine adjustment assembly includes a first soft rubber, and the first soft rubber is clamped between the first connection end and the lumbar support assembly and / or between the second connection end and the lumbar support assembly.

[0009] Further, the first fine adjustment assembly further 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 connection assembly or the lumbar support assembly. The first soft rubber is arranged between the movable member and the first fixing assembly, and the connection assembly and the lumbar support assembly are connected by connecting the first fixing assembly and the movable member. 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.

[0010] Further, an installation cylinder is arranged on the connection assembly, the gear switch is connected to the installation cylinder, at least part of the movable member is located in the installation cylinder, a first installation groove is arranged on the lumbar support assembly, the first soft rubber is arranged in the first installation groove, part of the movable member passes through the first soft rubber and is connected to the part of the first fixing assembly passing through the first installation groove, and 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;

[0011] Alternatively, an installation cylinder is arranged on the lumbar support assembly, the gear switch is connected to the installation cylinder, at least part of the movable member is also located in the installation cylinder, a first installation groove is arranged on the connection assembly, the first soft rubber is arranged in the first installation groove, part of the movable member passes through the first soft rubber and is connected to the part of the first fixing assembly passing through the first installation groove, and 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.

[0012] Further, a lifting adjustment assembly for driving the lumbar support assembly to lift is arranged on the connection assembly; the connection assembly includes a first connection member and a second connection member. The first connection end and the second connection end are arranged on the first connection member, and the second connection member is connected to the seat cushion assembly or the base; the lifting adjustment assembly is arranged between the first connection member and the second connection member, and the first connection member and the second connection member can move relative to each other through the lifting adjustment assembly to lift the lumbar support assembly.

[0013] Further, the lifting and adjusting assembly includes a fixing member, a fixing seat, an elastic member, and a gear member; the fixing member is connected to the first connecting member, the fixing seat is connected to the second connecting member, the gear member is rotatably connected to the fixing seat, the fixing member is sleeved around the periphery of the fixing seat and can slide relative thereto, a gear rack is provided on one inner side wall of the fixing member, and engaging teeth are provided on one side wall of the gear member. The engaging teeth of the gear member are engaged with the gear rack on the fixing member. The elastic member is arranged between the gear member and the fixing seat. The elastic member urges the engaging teeth on the gear member to engage with the gear rack on the fixing member. By moving the first connecting member, the fixing member can be driven to reciprocate in the length direction relative to the fixing seat, and the elastic member urges the gear member to position the fixing member.

[0014] Further, a first limiting wall is arranged in the fixing seat, and first strip-shaped holes are respectively arranged on two opposite side walls of the fixing seat. The lifting and adjusting assembly further includes a first rotating shaft. The gear member is sleeved on the first rotating shaft. The two ends of the first rotating shaft respectively extend into the first strip-shaped holes at the corresponding ends and can reciprocate in the first strip-shaped holes under the action of the fixing member.

[0015] In the first state, the first rotating shaft is located at the first end of the first strip-shaped hole at the lower side. The gear member is separated from the first limiting wall. Under the action of the elastic member, the engaging teeth on the gear member are engaged with the gear rack on the fixing member, and the lumbar support assembly is in a state where it can be adjusted to a higher position.

[0016] In the second state, the first rotating shaft is located at the second end of the first strip-shaped hole at the upper side. The gear member contacts the first limiting wall to limit the engagement between the engaging teeth on the gear member and the gear rack on the fixing member, and the lumbar support assembly is in a state where it can fall back to the lowest gear.

[0017] Further, the seat further includes a back support assembly. The back support assembly is located above the lumbar support assembly, and the lumbar support assembly and the back support assembly are connected by the connecting assembly. The connecting assembly further includes a third connecting end and a fourth connecting end. The third connecting end and the fourth connecting end are respectively arranged on both sides of the back support assembly and are movably connected to the back support assembly.

[0018] Further, 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.

[0019] Alternatively, a second fine adjustment component is provided between the third connection end and the back support component and / or between the fourth connection end and the back support component; the second fine adjustment component includes a second soft rubber and a second fixing component, the second soft rubber is disposed between the connection component and the back support component, and a part of the connection component passes through the second soft rubber and is connected to a part of the second fixing component that penetrates through the back support component, and the connection component and the back support component are connected through the second fixing component, and the second soft rubber is clamped between the connection component and the back support component; or, the second fine adjustment component includes a second soft rubber and a second fixing component, the second soft rubber is disposed between the connection component and the back support component, and a part of the back support component passes through the second soft rubber and is connected to a part of the second fixing component that penetrates through the connection component, and the connection component and the back support component are connected through the second fixing component, and the second soft rubber is clamped between the connection component and the back support component. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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. The same reference numerals in all the drawings indicate the same parts, and the drawings are not deliberately drawn to scale in actual size, and the emphasis is on showing the gist of the present invention.

[0021] Figure 1 It is a schematic structural diagram of the seat of the present invention.

[0022] Figure 2 It is a schematic structural diagram of the seat cushion assembly.

[0023] Figure 3 and Figure 4 It is an exploded view of the seat cushion assembly in different directions.

[0024] Figure 5 It is a schematic diagram of another embodiment of the elastic support structure.

[0025] Figure 6 It is a schematic diagram of another embodiment of the elastic support structure.

[0026] Figure 7 It is a schematic structural diagram of the backrest assembly.

[0027] Figure 8 and Figure 9 It is an exploded view of the backrest assembly in different directions.

[0028] Figure 10 It is a schematic structural diagram of the lifting adjustment component.

[0029] Figure 11 and Figure 12 It is an exploded view of the lifting adjustment component in different directions.

[0030] Figures 13-1 to 13-3 These are sectional views of the lifting adjustment assembly in various states.

[0031] Figure 14 These are schematic structural diagrams of one implementation of the first micro-motion adjustment assembly.

[0032] Figure 15 and Figure 16 are Figure 14 exploded views of the first micro-motion adjustment assembly in different directions in

[0033] Figure 17 These are sectional views of the first micro-motion adjustment assembly.

[0034] Figure 18 are Figure 8 a partially enlarged view of part A in

[0035] Figure 19 These are schematic structural diagrams of another implementation of the first micro-motion adjustment assembly.

[0036] Figure 20 are Figure 19 exploded views of the first micro-motion adjustment assembly in

[0037] 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 assembly 14; lumbar support assembly 15; back support assembly 16; first connecting piece 17; second connecting piece 18; fixing piece 19; fixing seat 20; elastic piece 21; gear piece 22; gear 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 micro-motion adjustment assembly 40; gear 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 glue 50; extrusion end 51; first connecting column 52; first installation groove 53; first connecting threaded part 54; first gasket 55; second soft glue 56; second connecting column 57; second connecting threaded part 58; headrest assembly 59; third connecting piece 60; fifth connection end 61; sixth connection end 62; seventh connection end 63; third soft glue 64; sacral support assembly 65; first end wall 66; second end wall 67; through hole 84; handle 85; positioning engagement part 86; tooth surface 87. Detailed implementation

[0038] For ease of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant accompanying drawings.

[0039] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element present at the same time. The terms "mounted", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this technology belongs. The terms used in the description of the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0041] In this application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the 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, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0042] 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0043] The present utility model provides a specific implementation manner of a seat. Refer to Figure 1-2, including a lumbar support assembly 15. The lumbar support assembly 15 is connected to the seat cushion assembly or the base 2 through a connection assembly. In this embodiment, the lumbar support assembly is connected to the base 2 through the connection assembly. The connection assembly includes a first connection end 36 and a second connection end 37. The first connection end 36 and the second connection end 37 are respectively arranged on both sides of the lumbar support assembly and are movably connected to the lumbar support assembly. The lumbar support assembly supports the user's waist. By connecting the respective connection ends on the connection assembly to both sides of the lumbar support assembly, and the connection points of the first connection end 36 and the second connection end 37 with the lumbar support assembly are movably connected respectively, when the user's waist and back move, the lumbar support assembly can generate corresponding swings to adapt to the position of the user's waist and back after adjusting the posture, making the lumbar support assembly fit the user's waist better and providing a better sense of comfort. In a 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; this can enable the lumbar support assembly 15 to generate small swings better as the user's waist and back move, thus fitting the user's waist better, providing a better sense of comfort, and having a better support effect on the waist. In addition, both sides of the lumbar support assembly are bent towards the user side, forming a surrounding state for the user's waist, which can fit the user's waist more closely and have a better support effect.

[0044] In a preferred embodiment, referring to Figure 1-20 , a first micro-adjustment assembly is provided between the first connection end and the lumbar support assembly and / or between the second connection end and the lumbar support assembly; the first micro-adjustment assembly includes a first soft rubber, and the first soft rubber is clamped between the first connection end and the lumbar support assembly and / or between the second connection end and the lumbar support assembly. Specifically, a first micro-adjustment assembly 40 can be provided between the first connection end 36 and the lumbar support assembly 15 or between the second connection end 37 and the lumbar support assembly 15, or the first micro-adjustment assembly 40 can be provided between the first connection end 36 and the lumbar support assembly 15 and between the second connection end 37 and the lumbar support assembly 15 at the same time; by providing the first micro-adjustment assembly 40 between each connection end and the lumbar support assembly 15, when the user's waist and back move, the lumbar support assembly 15 can squeeze the first soft rubber 50 to generate corresponding slight swings to adapt to the position of the user's waist and back after adjusting the posture, making the lumbar support assembly fit the user's waist better and providing a better sense of comfort.

[0045] In a preferred embodiment, referring to Figure 14, the first fine adjustment assembly further includes a gear switch 41, a movable member 42 that can elastically move and cooperate with the gear switch 41, and a first fixing assembly. The gear switch 41 and the movable member 42 are arranged on the connecting assembly or the lumbar support assembly 15, that is, the gear switch 41 and the movable member 42 can be arranged on the connecting assembly at the same time, or can be arranged on the lumbar support assembly 15 at the same time. The specific implementation shown in this embodiment is arranged on the connecting assembly; the connecting assembly and the lumbar support assembly 15 are connected by connecting the movable member 42 through the first fixing assembly. The first soft rubber 50 is arranged between the movable member 42 and the first fixing assembly. The movable member is unlocked or locked by adjusting the gear switch 41, and the movable member 42 is driven to reciprocate in the horizontal direction by squeezing or loosening the lumbar support assembly 15. The lumbar support assembly 15 can be adjusted to reciprocate in the direction of approaching or departing from the user's waist through the first fine adjustment assembly 40, so as to adapt to the user's waist position and better support the user's waist.

[0046] In this embodiment, specific implementation manners of various connection methods of the first fine adjustment assembly 40 are provided. The first implementation manner: Refer to Figures 14-17, an installation cylinder 43 is provided on the connecting component. Specifically, the installation cylinder 43 is provided on the first connecting piece 17 of the connecting component. In this embodiment, the through hole inside the installation cylinder 43 penetrates through both ends of the installation cylinder 43 along the axial direction of the installation cylinder 43, and a baffle 44 is provided 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 spaced apart 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 part 42. A plurality of first limiting protrusions 48 are spaced apart along the axial direction of the third connecting portion. At least one second limiting protrusion 49 is spaced apart along the axial direction inside the moving part 42. Or a plurality of first limiting protrusions 48 are spaced apart along the axial direction of the third connecting portion, and a plurality of second limiting protrusions 49 are spaced apart along the axial direction inside the moving part 42. Or it can also be that a plurality of first limiting protrusions 48 are spaced apart along the axial direction of the third connecting portion, and a plurality of second limiting protrusions 49 are spaced apart along the axial direction inside the moving part 42. All of them can achieve the limitation between the moving part 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 part 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 part 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 part 42 is located inside the installation cylinder 43. Specifically, the part of the moving part 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 installation 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 arranged 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 installation groove 53 is arranged on the waist 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 part 54 and a first gasket 55. The first connecting threaded part 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 in the connecting assembly to the waist support assembly 15. A spring 47 sleeved on the gear switch 41 is arranged in the installation cylinder 43. One end of the spring 47 abuts against the end of the installation cylinder 43, that is, against the baffle 44 inside the installation cylinder 43, and the other end abuts against the end of the moving member 42. Since the first soft rubber 50 is arranged between the first connecting member 17 in the connecting assembly 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 generate corresponding slight swings 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 installation cylinder 43 and the first installation groove 53 are interchanged, that is, the installation cylinder 43 is arranged on the waist support assembly 15, and the first installation groove 53 is arranged on the first connecting member 17 in the connecting assembly. 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. Engagement 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 51. A hollow first connecting column 52 is provided inside the extrusion end 51. The first connecting column 52 passes 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 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 passing 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 passes 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 and 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 surface. A tooth surface 87 meshing with the engagement teeth on the gear shift switch 41 is arranged along the axial direction on the plane. By rotating the gear shift switch 41, the engagement teeth on the positioning engagement portion 86 are engaged with or disengaged 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 arranged 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 force 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 mode: The difference from the third implementation mode 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 mode and will not be elaborated here.Among them, the third implementation method has a simpler structure, more convenient operation, and stronger practicability.

[0047] In a preferred embodiment, a lifting adjustment assembly 14 for driving the lifting of the lumbar support assembly 15 is provided on the connection assembly; the connection assembly includes a first connection member 17 and a second connection member 18, a first connection end 36 and a second connection end 37 are provided on the first connection member 17, and the second connection member 18 is connected to the seat cushion assembly or to the base 2. In this embodiment, the second connection member 18 is connected to the base 2; the lifting adjustment assembly is provided between the first connection member 17 and the second connection member 18. Through the lifting adjustment assembly 14, the first connection member 17 and the second connection member 18 can move relative to each other to lift the lumbar support assembly 15; by adjusting the height of the lumbar support assembly 15, it can be suitable for users of different heights and improve the use comfort. There is at least one set of the lifting adjustment assembly 14. When there is only one set, the lifting adjustment assembly 14 can be provided between the middle of the first connection member 17 and the middle of the second connection member 18, or two sets can be used, symmetrically arranged on the first connection member 17 and also located between the first connection member 17 and the second connection member 18. In this embodiment, the lifting adjustment assembly 14 includes a fixing member 19, a fixing seat 20, an elastic member 21 and a gear member 22; the fixing member 19 is connected to the first connection member 17, the fixing seat 20 is connected to the second connection 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. 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 provided between the gear member 22 and the fixing seat 20. By the elastic member 21, the engaging tooth 24 on the gear member 22 is urged to mesh with the gear rack 23 on the fixing member 19. The user can drive the first connection member 17 to move up and down by moving the lumbar support assembly 15 up and down, which 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. And through the pre-tightening force generated by the elastic member 21, the gear member 22 is always urged to move in the direction of 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 position of the fixing member 19; by moving the lumbar support assembly 15 up and down, when it is necessary to unlock the gear member 22, only by moving the lumbar support assembly 15, 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, and at the same time 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, so that the lumbar support assembly 15 is stabilized at this height.

[0048] In a preferred embodiment, refer to Figures 13-1 to 13-3, a first limiting wall 25 is provided in the fixed seat 20, and first strip-shaped holes 26 are respectively provided on two opposite side walls of the fixed seat 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. The two ends of the first rotating shaft 27 respectively extend into the first strip-shaped holes 26 at the corresponding ends and 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 waist 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 being engaged with the gear rack 23 on the fixing member 19, and the waist 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 fixed seat 20. The third protrusion 29 on the gear member 22 passes through the first through hole 30 on the fixed seat 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 waist support assembly 15 is at one of the height gears, if the user needs to raise the waist support assembly 15, 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 fixed seat 20 and disengages from the first groove 28 on the fixing member 19. By lifting the waist support assembly 15 upward, the waist support assembly 15 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 compress the elastic member 21 at the same time. After the fixing member 19 moves to a suitable height along with the waist support assembly 15, the gear member 22 returns under the elastic action of the elastic member 21 to make the engaging teeth 24 mesh with the tooth grooves on the gear rack 23 opposite thereto to fix the height of the waist support assembly 15;If the user needs to lower the lumbar support component 15, the lumbar support component 15 needs to be first returned to the lowest position (also called the lowest gear), and then the above-mentioned operation is performed to adjust it to the required height. Specifically, continuously lift the lumbar support component 15 so that the first groove 28 on the fixing member 19 continuously rises. During the process of the lumbar support component 15 rising to the highest position, the gear member 22 is affected by the teeth in the gear rack 23, prompting 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 at the lower part of 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 (also 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 rotation of the gear member 22 under the action of the elastic member 21 is restricted by the first limiting wall 25, 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 lumbar support component 15 can fall back to the lowest position. At this time, the second end wall 67 at the upper part in the first groove 28 on the fixing member 19 contacts the third protrusion 29 of the gear member 22. Subsequently, when raising the lumbar support component 15 from the lowest position, it is necessary to first push down the lumbar support component 15 so that the second end wall in the first groove 28 on the fixing member 19 presses down the third protrusion 29 on the gear member 22, causing the gear member 22 and the first rotating shaft 27 to move down to the first end 31 of the first elongated hole 26. At this time, the gear member 22 is disengaged from the first limiting wall 25. Since the gear member 22 is no longer restricted by the first limiting wall 25, the elastic member 21 can prompt the engaging teeth 24 on the gear member 22 to engage into the tooth groove corresponding to the first gear 33 in the gear rack 23 on the fixing member 19. At this time, the lumbar support component 15 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 lumbar support component 15 and being unable to effectively fix the height of the lumbar support component 15. 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 lumbar support component 15 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.;

[0049] In a preferred embodiment, the seat further includes a backrest support assembly 16, the backrest support assembly 16 is located above the lumbar support assembly 15, and the lumbar support assembly 15 is connected to the backrest support assembly 16 through a connection assembly; the connection assembly further includes a third connection end and a fourth connection end, the third connection end and the fourth connection end are respectively arranged on both sides of the backrest support assembly and are movably connected to the backrest support assembly. The backrest of the user is supported by the backrest support assembly. By connecting the third connection end 38 and the fourth connection end 39 on the connection assembly to both sides of the backrest support assembly 16, and the connection points of the third connection end 38 and the fourth connection end 39 with the backrest support assembly adopt movable connections respectively, when the user's lumbar and dorsal regions move, the backrest support assembly can generate corresponding swings, and together with the lumbar support assembly 15, it can adapt to the lumbar and dorsal positions of the user after adjusting the posture, making the backrest support assembly 16 and the lumbar support assembly 15 fit the user's lumbar and dorsal regions better, and the use comfort is better.

[0050] In a preferred embodiment, the connection points of the third connection end 38 and the fourth connection end 39 with the backrest support assembly 16 are located on the horizontal center line of the backrest support assembly 16; this can enable the backrest support assembly 16 to generate small swings better as the user's back moves, so as to better fit the user's back, with better use comfort and better support effect on the back. In addition, both sides of the backrest support assembly 16 are bent towards the user side, forming a surrounding state for the user's back, which can fit the user's back better and have a better support effect.

[0051] In a preferred embodiment, a second fine adjustment assembly is provided between the third connection end 38 and the backrest support assembly 16 and / or between the fourth connection end 39 and the backrest support assembly 16. It can be understood that the second fine adjustment assembly is provided between the third connection end 38 and the backrest support assembly 16 or between the fourth connection end 39 and the backrest support assembly 16, or can be provided between the third connection end 38 and the backrest support assembly 16 and between the fourth connection end 39 and the backrest support assembly 16 at the same time. The second fine adjustment assembly includes a second soft rubber 56 and a second fixing component. The second soft rubber 56 is provided between the connection component and the backrest support assembly 16. A part of the connection component passes through the second soft rubber 56 and is connected to a part of the second fixing component that penetrates the backrest support assembly 16. Specifically, the second soft rubber 56 is provided between the third connection end 38 and the backrest support assembly 16 and between the fourth connection end 39 and the backrest support assembly 16. A part of the connection component passes through the second soft rubber 56 and is connected to a part of the second fixing component that penetrates the backrest support assembly 16. That is, second connection posts 57 are respectively provided at the third connection end 38 and the fourth connection end 39 of the connection component. The second fixing component includes a second connection threaded part 58 and a second gasket. The second connection threaded part 58 in the second fixing component penetrates the second gasket and the backrest support assembly 16 and then is screwed into the inside of the second connection post 57 to connect the first connecting member 17 to the backrest support assembly 16 and clamp the second soft rubber 56 between the first connecting member 17 and the backrest support assembly 16. Alternatively, the second connection post 57 can be provided on the backrest support assembly 16, and the second connection threaded part 58 of the second fixing component penetrates the second gasket and the first connecting member 17 in the connection component and then is screwed into the corresponding second connection post 57 on the backrest support assembly 16. By providing the second soft rubber 56, when a user sits on the seat and adjusts the posture and moves the waist and back, the backrest support assembly 16 can generate corresponding slight swings with the continuously changing acting forces applied during the movement of the user, so that the backrest 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 fine adjustment assembly 40, the second fine adjustment assembly, and the connection component, the entire backrest component can generate corresponding fine movements following the movement 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.The connecting component includes a first connecting member 17. The third connecting end 38 and the fourth connecting end 39 are both provided on the first connecting member 17. Since the first connecting member 17 is also connected to the lumbar support assembly 15, after the distance between the lumbar support assembly 15 and the user's waist is adjusted by the first micro-adjustment assembly 40, the back support assembly 16 can be driven by the first connecting member 17 to move in the same direction, so that the back support assembly 16 can adaptively adjust the distance relative to the user's back, thus realizing the synchronous movement of the lumbar support assembly 15 and the back support assembly 16, providing a better support effect for the user's waist and back and better comfort. In addition, since the lifting adjustment assembly 14 is provided between the first connecting member 17 and the second connecting member 18 of the connecting component, when the lifting adjustment assembly 14 moves, the back support assembly 16 and the lumbar support assembly 15 will be lifted and lowered synchronously to adjust to the user's height.

[0052] In this embodiment, referring to Figure 1-18 , the seat further includes a seat cushion assembly. The seat cushion assembly includes a seat cushion frame 1. 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, and in the supporting 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, where the first part 4 is 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. The base 2 is used to provide the installation and support of the seat cushion assembly and the backrest assembly, and the base 2 can be configured to move with rollers 3.

[0053] In a preferred embodiment, referring to Figures 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 in a suspended state 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 is provided on the first part 4, and the soft pad or the mesh 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, since the first part 4 can elastically move relative to the second part 5, with the adjustment of the human sitting posture, the first part 4 can prompt the soft pad or the mesh to adjust the supporting effect on the human body in real time, improve the comfort of the sitting posture state, and reduce fatigue. With the structure that 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 in a suspended state relative to the second part 5, since the material of the seat cushion frame 1 is 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, 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 this open state structure, 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.

[0054] 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. The elastic support structure provides an elastic support force for the first part 4, thereby further improving the elastic movement effect of the first part 4 relative to the second part 5 and improving the comfort of the user.

[0055] In a preferred embodiment, the elastic support structure has various implementation manners. In the present utility model, the following specific implementation manners are provided. The first implementation manner: referring to Figures 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 foregoing 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 thighs, which can increase the amplitude of the 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 Figures 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 only on 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.

[0056] 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.

[0057] The third embodiment of the elastic support structure: Refer to Figure 6 , the elastic support structure may include a plurality of elastic sheets. The plurality of elastic sheets 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 sheets 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 be a detachable connection using 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.

[0058] In the preferred embodiment, refer to Figure 9 and 18, the seat further includes a headrest assembly 59. The headrest assembly 59 is located above the backrest assembly. The connecting assembly further includes a third connecting member 60. The headrest assembly 59 is connected to the 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 the second connecting member 18 is further connected to the first connecting member 17. The third connecting member 60 includes a fifth connecting end 61, a sixth connecting end 62, and a seventh connecting end 63. The fifth connecting end 61 is rotatably connected to the second connecting member 18. The sixth connecting end 62 and the seventh connecting end 63 are respectively arranged on both sides of the headrest assembly 59 and connected thereto. The connection points of the sixth connecting end 62 and the seventh connecting end 63 with the headrest assembly 59 are located on the horizontal center line of the headrest assembly 59. The sixth connecting end 62 and the seventh connecting 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. Therefore, the headrest assembly 59 can swing slightly better with the movement of the user's head and neck, so as to better fit the back 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 cases 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 posts 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 post 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 post 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 post 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 moves the head and neck, so that the headrest assembly 59 can better fit the back side of the head and neck, provide a better supporting 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 micro-moved correspondingly following the movement of the user's lumbar and back and the movement of the head and neck, so as to always fit the user's lumbar and back and head and neck, provide a better supporting effect, and have a better sense of comfort.

[0060] 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 can be connected to the seat cushion assembly or the base 2. Specifically, the sacral support assembly 65 is provided 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.

[0061] Furthermore, the headrest assembly 59, the lumbar support assembly 15 and the back support assembly 16 can adopt the existing technology, that is, they are formed by a frame and a soft pad or a mesh surface.

[0062] 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, comprising a lumbar support assembly, wherein the lumbar support assembly is connected to a seat cushion assembly or a base through a connecting assembly; characterized in that: The connecting component includes a first connecting end and a second connecting end, which are respectively arranged on two sides of the waist support component and are movably connected to the waist support component; the seat further includes a back support component, which is located above the waist support component, and the waist support component is connected to the back support component through the connecting component; the connecting component further includes a third connecting end and a fourth connecting end, which are respectively arranged on two sides of the back support component and are movably connected to the back support component.

2. The seat according to claim 1, characterized in that: The connection points of the first connecting end and the second connecting end with the waist support component are located on the horizontal center line of the waist support component.

3. The seat according to claim 1, characterized in that: A first fine adjustment component is arranged between the first connecting end and the waist support component and / or between the second connecting end and the waist support component; the first fine adjustment component includes a first soft rubber, and the first soft rubber is clamped between the first connecting end and the waist support component and / or between the second connecting end and the waist support component.

4. The seat according to claim 3, characterized in that: The first fine adjustment component further includes a gear switch, a movable member that can elastically move and cooperate with the gear switch, and a first fixing component. The gear switch and the movable member are arranged on the connecting component or the waist support component. The first soft rubber is arranged between the movable member and the first fixing component, and is connected to the movable member through the first fixing component to connect the connecting component and the waist support component. By adjusting the gear switch to unlock or lock the movable member, and by squeezing or loosening the waist support component to drive the movable member to reciprocate horizontally.

5. The seat according to claim 4, characterized in that: An installation cylinder is arranged on the connecting component, the gear switch is connected to the installation cylinder, at least part of the movable member is located in the installation cylinder, a first installation groove is arranged on the waist support component, and the first soft rubber is arranged in the first installation groove. Part of the movable member passes through the first soft rubber and is connected to the part of the first fixing component 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 arranged on the waist support component, the gear switch is connected to the installation cylinder, at least part of the movable member is also located in the installation cylinder, a first installation groove is arranged on the connecting component, and the first soft rubber is arranged in the first installation groove. Part of the movable member passes through the first soft rubber and is connected to the part of the first fixing component 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.

6. The seat according to claim 1, characterized in that: An elevating adjustment component for driving the lifting of the lumbar support component is provided on the connecting component; the connecting component includes a first connecting piece and a second connecting piece, the first connecting end and the second connecting end are provided on the first connecting piece, and the second connecting piece is connected to the seat cushion component or connected to the base; the elevating adjustment component is arranged between the first connecting piece and the second connecting piece, and the first connecting piece and the second connecting piece can move relative to each other through the elevating adjustment component so that the lumbar support component can be lifted and lowered.

7. The seat according to claim 6, characterized in that: The elevating adjustment component includes a fixing piece, a fixed seat, an elastic piece and a gear piece; the fixing piece is connected to the first connecting piece, the fixed seat is connected to the second connecting piece, the gear piece is rotatably connected to the fixed seat, the fixing piece is sleeved around the fixed seat and can slide relative to it, a gear rack is arranged on one inner side wall of the fixing piece, and a engaging tooth is arranged on one side wall of the gear piece, and the engaging tooth of the gear piece meshes with the gear rack on the fixing piece. The elastic piece is arranged between the gear piece and the fixed seat, and the elastic piece is used to urge the engaging tooth on the gear piece to mesh with the gear rack on the fixing piece. By moving the first connecting piece, the fixing piece can be driven to reciprocate in the length direction relative to the fixed seat, and the elastic piece is used to urge the gear piece to position the fixing piece.

8. The seat according to claim 7, characterized in that: A first limiting wall is arranged in the fixed seat and first strip-shaped holes are respectively arranged on two opposite side walls of the fixed seat. The elevating adjustment component further includes a first rotating shaft. The gear piece is sleeved on the first rotating shaft, and two ends of the first rotating shaft respectively extend into the first strip-shaped holes at the corresponding ends and can reciprocate in the first strip-shaped holes under the action of the fixing piece. In the first state, the first rotating shaft is located at the first end of the first strip-shaped hole at the lower side, the gear piece is separated from the first limiting wall, and under the action of the elastic piece, the engaging tooth on the gear piece meshes with the gear rack on the fixing piece, and the lumbar support component is in a state where it can be adjusted to a higher position. In the second state, the first rotating shaft is located at the second end of the first strip-shaped hole at the upper side, the gear piece contacts the first limiting wall to limit the meshing of the engaging tooth on the gear piece with the gear rack on the fixing piece, and the lumbar support component is in a state where it can fall back to the lowest gear.

9. The seat according to claim 1, characterized in that: 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; alternatively, a second fine adjustment assembly is provided between the third connection end and the back support assembly and / or between the fourth connection end and the back support assembly; the second fine adjustment assembly includes a second soft rubber and a second fixing component, the second soft rubber is arranged between the connection assembly and the back support assembly, a part of the connection assembly passes through the second soft rubber and then is connected to the part of the second fixing component that penetrates the back support assembly, and the connection assembly and the back support assembly are connected through the second fixing component, and the second soft rubber is clamped between the connection assembly and the back support assembly; alternatively, the second fine adjustment assembly includes a second soft rubber and a second fixing component, the second soft rubber is arranged between the connection assembly and the back support assembly, a part of the back support assembly passes through the second soft rubber and then is connected to the part of the second fixing component that penetrates the connection assembly, and the connection assembly and the back support assembly are connected through the second fixing component, and the second soft rubber is clamped between the connection assembly and the back support assembly.

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