Seat

Abstract

The utility model relates to the technical field of home furnishing or office supplies, and particularly discloses a seat which comprises a backrest assembly, the backrest assembly comprises a back supporting assembly, the back supporting assembly comprises a back supporting framework, the back supporting framework is wrapped with tensioned first mesh cloth, a plurality of mesh holes are formed in the first mesh cloth at intervals, and the first mesh cloth and the second mesh cloth are arranged in a staggered mode. The first screen cloth is provided with a first supporting area used for supporting the back of the human body, and the perforation rate of the first supporting area is larger than that of the part, located outside the first supporting area, of the first screen cloth, so that the first screen cloth can wrap the back of the human body when being subjected to pressure applied by the back of the human body. The punching rate of the first supporting area in the seat is larger than that of the part, located outside the first supporting area, of the first mesh cloth, so that when the first mesh cloth is subjected to pressure applied by the back of the human body, the first mesh cloth wraps the back of the human body, the back of the human body is effectively supported, and meanwhile, the back of the human body can be prevented from being partially suspended; and the use comfort is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of household or office supplies, and particularly relates 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 are concerned about. When people are working or studying, they usually need to sit at a desk for a long time. 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, in order to support the human back, the mesh cloth wrapped on the existing backrest is relatively hard as a whole and lacks softness. At this time, only the scapula part of the human back can touch the mesh cloth, and the rest of the part will be in a suspended state and cannot be effectively supported. After maintaining a sitting posture for a period of time, the user will feel fatigued and the comfort is poor. Summary of the Utility Model

[0003] The utility model aims to solve the technical problems existing in the prior art, and provides a seat, the backrest assembly of which can effectively support the user's back and enable the user to feel comfortable when maintaining a 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 backrest assembly. The backrest assembly includes a back support assembly. The back support assembly includes a back support skeleton, on which a tensioned first mesh cloth is covered. A plurality of mesh holes are arranged at intervals on the first mesh cloth. The first mesh cloth has a first support area for supporting the human back. The perforation rate of the first support area is greater than that of the part of the first mesh cloth outside the first support area, so that the first mesh cloth can wrap the human back when subjected to the pressure exerted by the human back.

[0006] In the seat according to the utility model, a plurality of mesh holes are arranged on the first mesh cloth, and a first support area is arranged on the first mesh cloth. The perforation rate of the first support area is greater than that of the part of the first mesh cloth outside the first support area, which can make the first mesh cloth softer at the first support area and harder for the part outside the first support area relative to the first support area. Thus, when the first mesh cloth is subjected to the pressure exerted by the human back, the first mesh cloth can wrap the human back, so as to effectively support the human back while avoiding part of the human back from being suspended, and improving the user's comfort.

[0007] Further, there are two first support areas, and the two first support areas are respectively opposite to the scapula positions on both sides of the human back;

[0008] Alternatively, the perforation rate gradually decreases from the two first support regions to the connection between the back support frame and the first mesh fabric.

[0009] Furthermore, the backrest assembly further includes a lumbar support assembly. The lumbar support assembly includes a lumbar support frame, on which a tensioned second mesh fabric is covered. A plurality of mesh holes are spaced on the second mesh fabric. The second mesh fabric has a second support region for supporting the human waist. The perforation rate of the second support region is greater than that of the portion of the second mesh fabric outside the second support region, so that the second mesh fabric can wrap around the human waist when subjected to the pressure exerted by the human waist.

[0010] Furthermore, the second support region is opposite to the iliac bone position of the human body;

[0011] Alternatively, the perforation rate gradually decreases from the second support region to the connection between the lumbar support frame and the second mesh fabric.

[0012] Furthermore, the lumbar support frame and the back support frame are integrally formed, and the first mesh fabric and the second mesh fabric are integrally formed;

[0013] Alternatively, the lumbar support frame and the back support frame are separately formed, and the first mesh fabric and the second mesh fabric are respectively covered on the corresponding frames.

[0014] Furthermore, the seat further includes a seat cushion assembly. The seat cushion assembly includes a seat cushion frame, on which a tensioned third mesh fabric is covered. A plurality of mesh holes are spaced on the third mesh fabric. The third mesh fabric has a third support region for supporting the human buttocks. The perforation rate of the third support region is greater than that of the portion of the third mesh fabric outside the third support region, so that the third mesh fabric can wrap around the human buttocks when subjected to the pressure exerted by the human buttocks.

[0015] Furthermore, the third support region is opposite to the ischial position of the human body;

[0016] Alternatively, the perforation rate gradually decreases from the third support region to the connection between the seat cushion frame and the third mesh fabric.

[0017] Furthermore, the seat further includes a leg support assembly. The leg support assembly includes a leg support frame, on which a tensioned fourth mesh fabric is covered. A plurality of mesh holes are spaced on the fourth mesh fabric. The fourth mesh fabric has a fourth support region for supporting the human calf. The perforation rate of the fourth support region is greater than that of the portion of the fourth mesh fabric outside the fourth support region, so that the fourth mesh fabric can wrap around the human calf when subjected to the pressure exerted by the human calf.

[0018] Further, the fourth support area corresponds to the position of the tibia at the lower leg of the human body;

[0019] Alternatively, the perforation rate gradually decreases from the fourth support area to the connection between the leg support framework and the second mesh.

[0020] Further, the perforation rate of the first support area is 75% - 95%; or the perforation rate of the second support area is 75% - 95%; or the perforation rate of the third support area is 75% - 95%; or the perforation rate of the fourth support area is 75% - 95%.

[0021] Further, the back support assembly is connected to the seat cushion assembly or the base through a connection assembly; the connection assembly 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 back support assembly and are movably connected to the back support assembly; 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;

[0022] A second fine adjustment assembly is arranged between the third connection end and the back support assembly and 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 through 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; or, 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 through 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.

[0023] Further, the seat further includes a lumbar support assembly, the lumbar 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, the first connection end and the second connection end are respectively arranged on both sides of the lumbar support assembly and are movably connected to the lumbar support assembly; 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;

[0024] A first fine adjustment component is provided between the first connection end and the lumbar support component and between the second connection end and the lumbar support component; the first fine adjustment component includes a first soft rubber, and the first soft rubber is clamped between the first connection end and the lumbar support component and between the second connection end and the lumbar support component;

[0025] The first fine adjustment component further includes a gear switch, a movable member that can move elastically and cooperate with the gear switch, and a first fixing component. The gear switch and the movable member are arranged on the connection component or the lumbar support component. The first soft rubber is arranged between the movable member and the first fixing component, and the connection component and the lumbar support component are connected through the connection between the first fixing component 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 component.

[0026] Furthermore, a lifting adjustment component for driving the lumbar support component to lift is arranged on the connection component; the connection component includes a first connecting piece and a second connecting piece. The first connection end, the second connection end, the third connection end, and the fourth connection end are all arranged on the first connecting piece, and the second connecting piece is connected to the seat cushion component or the base; the lifting 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 lifting adjustment component, so that the back support component and the lumbar support component can be lifted and lowered synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the present invention will become clearer through the preferred embodiments of the present invention shown in the 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 focus is on showing the gist of the present invention.

[0028] Figure 1 It is a schematic diagram of the seat structure of the present invention (with a mesh).

[0029] Figure 2 It is a schematic diagram of the structure of the present invention (removing the mesh).

[0030] Figure 3 It is a schematic diagram of the perforation rate distribution state in the back support component.

[0031] Figure 4 It is a schematic diagram of the perforation rate distribution state in the lumbar support component.

[0032] Figure 5 It is a schematic diagram of the perforation rate distribution state in the seat cushion component.

[0033] Figure 6It is a schematic structural diagram of a backrest assembly.

[0034] Figure 7 And Figure 8 They are schematic exploded views of the backrest assembly in different directions.

[0035] Figure 9 It is a schematic structural diagram of a lifting adjustment assembly.

[0036] Figure 10 And Figure 11 They are schematic exploded views of the lifting adjustment assembly in different directions.

[0037] Figures 12 - 14 They are cross-sectional views of various states of the lifting adjustment assembly.

[0038] Figure 15 It is a schematic structural diagram of one implementation of the first micro-motion adjustment assembly.

[0039] Figure 16 And Figure 17 For Figure 15 They are schematic exploded views of the first micro-motion adjustment assembly in different directions in

[0040] Figure 18 It is a cross-sectional view of the first micro-motion adjustment assembly.

[0041] Figure 19 For Figure 7 It is a partial enlarged view of part A in

[0042] Figure 20 It is a schematic structural diagram of another implementation of the first micro-motion adjustment assembly.

[0043] Figure 21 For Figure 20 They are schematic exploded views of the first micro-motion adjustment assembly in Specific implementation mode

[0044] To facilitate the understanding of the present utility model, the following will provide a more comprehensive description of the present utility model with reference to the relevant drawings.

[0045] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element and integrated with it, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used in this article are only for the purpose of illustration.

[0046] 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 utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0047] 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 indirectly in 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 horizontal height of the first feature is higher than that of 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 horizontal height of the first feature is less than that of the second feature.

[0048] 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.

[0049] This embodiment provides a specific implementation manner of a seat, see Figure 1 and Figure 2, including a backrest assembly. The backrest assembly includes a back support assembly 16. The back support assembly 16 includes a back support skeleton, on which a tensioned first mesh 68 is covered. A plurality of mesh holes are arranged at intervals on the first mesh 68. The first mesh 68 has a first support area 69 for supporting the human back. The perforation rate of the first support area 69 is greater than the perforation rate of the part of the first mesh 68 outside the first support area 69, so that the first mesh 68 can wrap the human back when subjected to the pressure exerted by the human back. A plurality of mesh holes are provided on the first mesh 68 in the seat, and the perforation rate of the first support area 69 is greater than the perforation rate of the part of the first mesh 68 outside the first support area 69, which can realize the regional change of the softness and hardness of the first mesh, that is, the first mesh is softer at the first support area and radiates from the first support area to the surrounding, and the hardness increases. Therefore, when the first mesh is subjected to the pressure exerted by the human back, the first mesh can wrap the human back, so that while effectively supporting the human back, it can also prevent part of the human back from being suspended, improving the user's comfort.

[0050] In a preferred embodiment, referring to Figure 3 , the first support area 69 can be one or two. When there is only one first support area 69, one first support area 69 needs to be opposite to the scapulas on both sides of the human back. When there are two first support areas, the two first support areas are respectively opposite to the positions of the scapulas on both sides of the human back. The perforation rate gradually decreases from the first support area 69 to the connection between the back support skeleton and the first mesh 68. Specifically, in the present invention, the back support assembly 16 takes the first support area 69 as the basic area and radiates to the surrounding of the back support assembly 16, and the perforation rate shows a gradually decreasing state. Referring to Figure 3, it can be understood that the perforation rate of the first support area 69 is the largest, with a perforation rate of 75%-95%. At this time, the first mesh fabric 68 is softer at the first support area 69 than other parts of the first mesh fabric 68, while the part of the first mesh fabric 68 around the back support assembly 16 is harder than other parts of the first mesh fabric 68. When the human back leans on the back support assembly 16, the scapula area mainly exerts a force on the first mesh fabric 68. At this time, the part of the first mesh fabric 68 in contact with the scapula area will receive a greater force, and this area is the first support area 69. Since the first support area is relatively soft, and the softness distribution of the first mesh fabric 68 is from the first support area 69 to the periphery of the back support assembly 16 (since the back support skeleton is a frame structure, it can also be said to be from the first support area 69 to the connection between the back support skeleton and the first mesh fabric 68), the hardness gradually increases, that is, the support strength gradually increases. At this time, when the human back leans on the back support assembly 16, the first mesh fabric 68 can wrap the human back, fit the human back better, and have a better support effect, making the user feel more comfortable. In addition, for the distribution of the perforation rate on the first mesh fabric 68, according to actual production, with the first support area 69 as the center, it can be divided into regions radially around the back support assembly 16, and the perforation rates of different regions are limited, as long as it meets the condition that the perforation rate gradually decreases from the first support area 69 to the periphery of the back support assembly 16. See Figure 3 .

[0051] In the preferred embodiment, see Figure 1 and 2 , the backrest assembly further includes a lumbar support assembly 15. The lumbar support assembly 15 includes a lumbar support skeleton, and a tensioned second mesh fabric 70 is covered on the lumbar support skeleton. A plurality of mesh holes are arranged at intervals on the second mesh fabric 70. The second mesh fabric 70 has a second support area 71 for supporting the human lumbar region. The perforation rate of the second support area 71 is greater than the perforation rate of the part of the second mesh fabric 70 outside the second support area 71, so that the second mesh fabric can wrap the human lumbar region when receiving the pressure exerted by the human lumbar region. A plurality of mesh holes are provided on the second mesh fabric 70 in the seat, and the perforation rate of the second support area 71 is greater than the perforation rate of the part of the second mesh fabric 70 outside the second support area 71, which can realize regional changes in the softness and hardness of the second mesh fabric 70, that is, the second mesh fabric 70 is softer at the second support area 71 and radiates from the second support area 71 to the periphery, with increasing hardness. Thus, when the second mesh fabric 70 receives the pressure exerted by the human back, the second mesh fabric 70 can wrap the human lumbar region, effectively supporting the human lumbar region while avoiding partial suspension of the human lumbar region and improving the user's comfort.

[0052] In a preferred embodiment, the second support region 71 corresponds to the iliac bone position of the human body; the perforation rate gradually decreases from the second support region to the connection between the lumbar support skeleton and the second mesh 70; specifically, in the present utility model, the lumbar support assembly 15 takes the second support region 71 as the base region and radiates to the periphery of the lumbar support assembly 15, and the perforation rate shows a gradually decreasing state. Refer to Figure 4 , it can be understood that the perforation rate is the largest in the second support region 71, and the perforation rate is 75%-95%. At this time, the second mesh 70 is softer at the second support region 71 than other parts of the second mesh 70, while the part of the second mesh 70 around the lumbar support assembly 15 is harder than other parts of the second mesh 70. Since the human waist leans on the lumbar support assembly 15, mainly the iliac bone region exerts a force on the second mesh 70. At this time, the part of the second mesh 70 in contact with the iliac bone region will receive a greater force, and this region is the second support region 71. Since the second support region 71 is relatively soft, and the softness distribution of the second mesh 70 is from the second support region 71 to the periphery of the lumbar support assembly 15 (since the lumbar support skeleton is a frame structure, it can also be said to be from the second support region 71 to the connection between the lumbar support skeleton and the second mesh 70), the hardness gradually increases, that is, the support strength gradually increases. At this time, when the human waist leans on the lumbar support assembly 15, the second mesh 70 can wrap the human waist, fit the human waist more closely, and thus, together with the first mesh 68 in the back support assembly 16, wrap the entire lumbar and dorsal regions of the human body, further improving the support effect and making the user feel more comfortable. In addition, for the distribution of the perforation rate on the second mesh 70, according to actual production, with the second support region 71 as the center, it can be divided into regions in a radial state around the lumbar support assembly 15, and the perforation rates of different regions can be limited, as long as it meets the condition that the perforation rate gradually decreases from the second support region 71 to the connection between the lumbar support skeleton and the second mesh 70. Refer to Figure 4 .

[0053] In a preferred embodiment, the lumbar support skeleton and the back support skeleton are integrally formed. At this time, the first mesh 68 and the second mesh 70 are integrally formed, that is, the lumbar support assembly 15 and the back support assembly 16 are integrally arranged; Refer to Figure 1 , the lumbar support skeleton and the back support skeleton can also be separately formed, and the first mesh 68 and the second mesh 70 are respectively coated on the corresponding skeletons, that is, the first mesh 68 is coated on the back support skeleton, and the second mesh 70 is coated on the lumbar support skeleton; that is, the lumbar support assembly 15 and the back support assembly 16 are separately arranged, which is convenient for respectively performing fine adjustment with the first fine adjustment component and the second fine adjustment component to further adapt to the shape of the human lumbar and dorsal regions, fit more closely, and have a better support effect.

[0054] In a preferred embodiment, refer toFigure 1 and 2 The seat further includes a seat cushion assembly. The seat cushion assembly includes a seat cushion frame, on which a tensioned third mesh fabric 72 is covered. A plurality of mesh holes are arranged at intervals on the third mesh fabric. There is a third support area 73 for supporting the human buttocks on the third mesh fabric. The perforation rate of the third support area 73 is greater than that of the part of the third mesh fabric 72 located outside the third support area 73, so that the third mesh fabric 72 can wrap the human buttocks when subjected to the pressure exerted by the human buttocks. A plurality of mesh holes are provided on the third mesh fabric 72 in the seat. The perforation rate of the third support area 73 is greater than that of the part of the third mesh fabric 72 located outside the third support area 73, which can realize a regional change in the softness and hardness of the third mesh fabric 72, that is, the third mesh fabric 72 is softer at the third support area 73 and radiates from the third support area 73 to the surroundings, and the hardness increases. Thus, when the third mesh fabric 72 is subjected to the pressure exerted by the human buttocks, the third mesh fabric 72 can wrap the human buttocks, so that while effectively supporting the human buttocks, it can also prevent part of the human buttocks from being suspended, improving the user's comfort.

[0055] In a preferred embodiment, the third support area 73 is opposite to the ischial position of the human body, and the perforation rate gradually decreases from the third support area 73 to the connection between the seat cushion frame and the third mesh fabric 72. Specifically, in the present invention, the seat cushion assembly takes the third support area 73 as the basic area and radiates to the periphery of the seat cushion assembly, and the perforation rate shows a gradually decreasing state. See Figure 5, it can be understood that the perforation rate of the third support area 73 is the largest, with a perforation rate of 75%-95%. At this time, the third mesh 72 is softer at the third support area 73 than other parts of the third mesh 72, while the part of the third mesh 72 around the seat cushion assembly is harder than other parts of the third mesh 72. When the human buttocks sit on the seat cushion assembly, the ischial region mainly exerts a force on the third mesh 72. At this time, the part of the third mesh 72 in contact with the ischial region will receive a large force, and this region is the third support area 73. Since the third support area 73 is relatively soft, and the softness distribution of the third mesh 72 is from the third support area 73 to the periphery of the seat cushion assembly (since the seat cushion frame is a frame structure, it can also be said to be from the third support area 73 to the connection between the seat cushion frame and the third mesh 72), the hardness gradually increases, that is, the support strength gradually increases. When the human buttocks sit on the seat cushion assembly at this time, the third mesh 72 can wrap the human buttocks, fit the human buttocks more closely, further improve the support effect, and the user feels more comfortable. In addition, for the distribution of the perforation rate on the third mesh 72, according to actual production, with the third support area 73 as the center, it is divided into regions in a radial state towards the periphery of the seat cushion assembly, and the perforation rates of different regions are limited, as long as it meets the condition that the perforation rate gradually decreases from the third support area 73 to the connection between the seat cushion frame and the third mesh 72. See Figure 5 .

[0056] In the preferred embodiment, see Figures 1 - 2 , the seat further includes a leg support assembly. The leg support assembly includes a leg support skeleton, and a tensioned fourth mesh 74 is covered on the leg support skeleton. A plurality of mesh holes are arranged at intervals on the fourth mesh 74. The fourth mesh 74 has a fourth support area 75 for supporting the human calf. The perforation rate gradually decreases from the fourth support area 75 to the periphery of the leg support assembly 76, so that the fourth mesh 74 can wrap the human calf when receiving the pressure exerted by the human calf. A plurality of mesh holes are provided on the fourth mesh 74 in the seat. The perforation rate of the fourth support area 75 is greater than the perforation rate of the part of the fourth mesh 74 outside the fourth support area 75, which can realize regional changes in the softness and hardness of the fourth mesh 74, that is, the fourth mesh 74 is softer at the fourth support area 75 and radiates from the fourth support area 75 to the periphery, and the hardness increases. Thus, when the fourth mesh 74 receives the pressure exerted by the human calf, the fourth mesh 74 can wrap the human calf, so that while effectively supporting the human calf, it can also prevent part of the human calf from being suspended, improving the user's comfort.

[0057] In a preferred embodiment, the fourth support area 75 corresponds to the position of the tibia at the calf of the human body. It can also be understood that the fourth support area 75 is located in the middle area of the fourth mesh 74; the perforation rate gradually decreases from the fourth support area 75 to the connection between the leg support skeleton and the fourth mesh 74. Specifically, in the present utility model, the leg support assembly takes the fourth support area 75 as the basic area and radiates to the periphery of the leg support assembly, and the perforation rate shows a gradually decreasing state. It can be understood that the perforation rate in the fourth support area 75 is the largest, and the perforation rate is 75%-95%. At this time, the fourth mesh 74 is softer at the position of the fourth support area 75 than other parts of the fourth mesh 74, while the part of the fourth mesh 74 located around the leg support assembly is harder than other parts of the fourth mesh 74. When the leg support assembly 76 is unfolded, when the calf of the human body is placed on the leg support assembly 76, mainly the tibia area exerts a force on the fourth mesh 74. At this time, the part of the fourth mesh 74 in contact with the tibia area will receive a greater force, and this area is the fourth support area 75. Since the fourth support area 75 is relatively soft, and the softness distribution of the fourth mesh 74 is from the fourth support area 75 to the periphery of the leg support assembly 76 (since the leg support skeleton is a frame structure, it can also be said to be from the fourth support area 75 to the connection between the leg support skeleton and the fourth mesh 74), the hardness gradually increases, that is, the support strength gradually increases. At this time, when the calf of the human body is placed on the leg support assembly 76, the fourth mesh 74 can wrap the calf of the human body, fit the calf of the human body more closely, further improve the support effect, and the user feels more comfortable. In addition, for the distribution of the perforation rate on the fourth mesh 74, according to actual production, with the fourth support area 75 as the center, it is divided into areas in a radial state around the leg support assembly 76, and the perforation rate of different areas is limited, as long as it meets the condition that the perforation rate gradually decreases from the fourth support area 75 to the connection between the leg support skeleton and the fourth mesh 74.

[0058] For example: Refer to Figure 3, for the perforation rate distribution state on the first mesh 68 of the backrest support assembly 16, for example, with the first support area 69 as the center, four areas are planned outwards, divided into a first area 77, a second area 78, a third area 79, and a fourth area 80. The perforation rate of the first support area 69 is 85%. The perforation rates of the four areas outside the first support area 69 are respectively: the perforation rate of the first area is 75%, the perforation rate of the second area is 65%, the perforation rate of the third area is 55%, and the perforation rate of the fourth area is 45%. The perforation rate distribution state on the second mesh 70 of the lumbar support assembly 15, the perforation rate distribution state on the third mesh 72 of the seat cushion assembly, and the perforation rate distribution state on the fourth mesh 74 of the leg support assembly 76 refer to the setting of the perforation rate distribution state on the first mesh 68 of the backrest support assembly 16. By setting in this way, both the breathability of the seat can be ensured, and the support strength of each part of the seat can also be ensured.

[0059] In the preferred embodiment, refer to Figures 1 - 19 , the backrest support assembly 16 is connected to the seat cushion assembly or the base 2 through a connection assembly; the connection assembly includes a third connection end 38 and a fourth connection end 39. The third connection end 38 and the fourth connection end 39 are respectively arranged on both sides of the backrest support assembly 16 and are movably connected to the backrest support assembly 16. The backrest support assembly 16 supports the user's back. 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 16 are movably connected respectively, when the user's waist and back move, the backrest support assembly 16 can generate corresponding swings, and together with the lumbar support assembly 15, it can adapt to the position of the user's waist and back after adjusting the posture, making the backrest support assembly 16 and the lumbar support assembly 15 fit the user's waist and back better, and the use comfort is better; 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; it can make the backrest support assembly 16 generate small swings better as the user's back moves, so as to better fit the user's back, the use comfort is better, and the support effect on the back is better. In addition, both sides of the backrest support assembly 16 are bent towards the user side, forming an enclosed state for the user's back, which can fit the user's back better and the support effect is better.

[0060] In the preferred embodiment, refer to Figures 1 - 19, a second fine adjustment assembly is provided between the third connection end 38 and the back support assembly 16 and between the fourth connection end 39 and the back support assembly 16. The second fine adjustment assembly includes a second soft rubber 56 and a second fixing assembly. The second soft rubber 56 is disposed between the connection assembly and the back support assembly 16. A part of the connection assembly passes through the second soft rubber 56 and is connected to a part of the second fixing assembly that penetrates through the back support assembly 16. Specifically, the second soft rubber 56 is disposed between the third connection end 38 and the back support assembly 16 and between the fourth connection end 39 and the back support assembly 16. A part of the connection assembly passes through the second soft rubber 56 and is connected to a part of the second fixing assembly that penetrates through the back support assembly 16. That is, second connection posts 57 are respectively disposed at the third connection end 38 and the fourth connection end 39 of the connection assembly. The second fixing assembly includes a second connection threaded member 58 and a second gasket. The second connection threaded member 58 in the second fixing assembly penetrates through the second gasket and the back 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 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 connection post 57 may be disposed on the back support assembly 16, and the second connection threaded member 58 of the second fixing assembly penetrates through the second gasket and the first connecting member 17 in the connection assembly and then is screwed into the corresponding second connection post 57 on the back 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 back support assembly 16 can generate corresponding slight swings with the continuously changing acting forces 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. The connection assembly includes a first connecting member 17, and the third connection end 38 and the fourth connection end 39 are both disposed on the first connecting member 17.

[0061] In a preferred embodiment, refer to Figures 1 - 19, the lumbar support component 15 is connected to the seat cushion component or the base 2 through a connection component. In this embodiment, the lumbar support component is connected to the base 2 through a connection component; the connection component includes a first connection end 36 and a second connection end 37, and the first connection end 36 and the second connection end 37 are respectively arranged on both sides of the lumbar support component and are movably connected to the lumbar support component. The lumbar support component supports the user's waist. By connecting the respective connection ends on the connection component to both sides of the lumbar support component, and the connection points of the first connection end 36 and the second connection end 37 with the lumbar support component are movably connected respectively, when the user's back moves, the lumbar support component can generate corresponding swings to adapt to the position of the user's back after adjusting the posture, making the lumbar support component more conform to the user's waist 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 component 15 are located on the horizontal center line of the lumbar support component 15; this can enable the lumbar support component 15 to generate small swings better as the user's back moves, thus better conforming to the user's waist, providing a better sense of comfort, and having a better support effect on the waist. In addition, both sides of the lumbar support component 15 are bent toward the user's side, forming a surrounding state for the user's waist, which can be more conform to the user's waist and have a better support effect.

[0062] In a preferred embodiment, refer to Figures 1 - 19 , a first micro-adjustment component is provided between the first connection end and the lumbar support component and between the second connection end and the lumbar support component; the first micro-adjustment component includes a first soft rubber, and the first soft rubber is clamped between the first connection end 36 and the lumbar support component 15 or between the second connection end 37 and the lumbar support component 15. By providing the first micro-adjustment component 40 between each connection end and the lumbar support component 15, when the user's back moves, the lumbar support component 15 can squeeze the first soft rubber 50 to generate corresponding slight swings as the user's back moves, so as to adapt to the position of the user's back after adjusting the posture, making the lumbar support component more conform to the user's waist and providing a better sense of comfort.

[0063] In a preferred embodiment, refer to Figures 1 - 19, the first fine adjustment assembly further includes a gear switch 41, a movable member 42 that can move elastically and cooperates 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 close to or away 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.

[0064] In this embodiment, refer to Figures 1 - 19, specific implementation manners of various connection methods of the first fine adjustment component 40 are provided. The first implementation manner: an installation cylinder 43 is provided on the connection component. Specifically, the installation cylinder 43 is provided on the first connecting piece 17 of the connection 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 arranged inside its through hole. The gear switch 41 is located inside the installation cylinder 43. Specifically, the gear 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 switch 41, and avoid large friction between the gear switch 41 and the elasticity when the gear 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 limitation between the moving member 42 and the gear switch 41. Specifically, when the gear 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 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 at 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 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 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. 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 that penetrates 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 in the connecting assembly 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 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 exerted 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 installation groove 53 are interchanged, that is, the mounting 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 20 - 21, 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 and engaging 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 and engaging portion 86 connected to the handle 85. Engaging teeth are provided on the positioning and engaging portion 86 of the gear shift switch. In addition, an eccentric shaft is provided on the positioning and engaging 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 squeezing the first soft rubber 50 is located outside the installation cylinder 43. The part of the moving member 42 for squeezing the first soft rubber 50 includes a disc-shaped squeezing end 51. A hollow first connecting column 52 is provided inside the squeezing end 51. The first connecting column 52 passes through the first soft rubber 50 and is connected to the first fixing assembly, and the squeezing 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 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 provided 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 engaging teeth on the gear shift switch 41 is arranged along the axial direction on the plane. By rotating the gear shift switch 41, the engaging teeth on the positioning and engaging 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 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 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 structure of the third implementation mode is simpler, the operation is more convenient, and the practicability is stronger. Through the combined action of the first fine adjustment component 40, the second fine adjustment component, and the connection component, the entire backrest component can be made to generate corresponding fine movements following the activities of the user's lumbar and back, so as to always fit the user's lumbar and back at all times, providing a better support effect and better comfort. In addition, since the first connecting member 17 connects the lumbar support component 15 and the back support component 16 at the same time, after the distance between the lumbar support component 15 and the user's waist is adjusted by the first fine adjustment component 40, the back support component 16 can be driven by the first connecting member 17 to move in the same direction, 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 lumbar and back and better comfort; in addition, since the lifting adjustment component 14 is arranged between the first connecting member 17 and the second connecting member 18 of the connection component, when the lifting adjustment component 14 moves, the back support component 16 and the lumbar support component 15 will be lifted and lowered synchronously to adjust to the user's height.

[0065] In the preferred embodiment, refer to Figures 1 - 19, a lifting adjustment component 14 for driving the lifting of the lumbar support component 15 is provided on the connecting component; the connecting component includes a first connecting piece 17 and a second connecting piece 18. The first connection end 36, the second connection end 37, the third connection end 38, and the fourth connection end 39 are all provided on the first connecting piece 17. The second connecting piece 18 is connected to the seat cushion component or to the base 2. In this embodiment, the second connecting piece 18 is connected to the base 2; the lifting adjustment component 14 is arranged between the first connecting piece 17 and the second connecting piece 18. Through the lifting adjustment component 14, the first connecting piece 17 and the second connecting piece 18 can move relative to each other, so that the back support component 16 and the lumbar support component 15 can be lifted and lowered synchronously. By adjusting the heights of the lumbar support component 15 and the back support component 16, it can be suitable for users of different heights and improve the comfort of use; there is at least one group of lifting adjustment components 14. When there is only one group, the lifting adjustment component 14 can be arranged between the middle of the first connecting piece 17 and the middle of the second connecting piece 18, or two groups can be used, symmetrically arranged on the first connecting piece 17 and also located between the first connecting piece 17 and the second connecting piece 18.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 is connected to the first connecting member 17, the fixing seat 20 is connected to 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. 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 arranged 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 waist support assembly 15 up and down, the user can drive the first connecting member 17 to move up and down, 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 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 position of the fixing member 19; by moving the waist support assembly 15 up and down, when it is necessary to unlock the gear member 22, only by moving the waist support assembly 15, forcing the gear rack 23 in the fixing member 19 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 waist support assembly 15 is stabilized at this height.

[0066] In a preferred embodiment, refer to Figures 1 - 19, 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. 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 engagement between the engaging teeth 24 on the gear member 22 and 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, and the first groove 28 faces the gear rack 23. A third protrusion 29 is provided on the gear member 22, and 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 lumbar support assembly 15 is at one of the height gears, if the user needs to raise the lumbar 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 lumbar support assembly 15 upward, the lumbar 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 at the same time compress the elastic member 21. After the fixing member 19 moves to a suitable height along with the lumbar support assembly 15, the gear member 22 returns under the elastic action of the elastic member 21 to make the engaging teeth 24 engage with the tooth grooves on the gear rack 23 opposite thereto, so as to fix the height of the lumbar 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 referred to as 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 to continuously raise the first groove 28 on the fixing member 19. 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 fixed 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 (also referred to as the "second end 32") in the first slot 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 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 lumbar support component 15 from the lowest position, it is necessary to first push down the lumbar support component 15 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 slot 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, 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, refer to; Figure 13 , 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 an inclined surface and can contact the lower surface (this lower surface is an inclined surface) 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.

[0067] In the preferred embodiment, refer to Figures 1 - 19, 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.

[0068] In a preferred embodiment, refer to Figures 1 - 19, a third micro-motion adjustment component 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 micro-motion adjustment component adopted in 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 micro-motion adjustment component includes a third soft rubber 64 and a third fixing component. The third soft rubber 64 is arranged 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 component that penetrates the headrest assembly 59. The third connection member 60 is connected to the headrest assembly 59 through the third fixing component, 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 arranged 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 component that penetrates the headrest assembly 59. That is, third connection posts are respectively arranged at the sixth connection end 62 and the seventh connection end 63 of the third connection member 60. The third fixing component includes a third connection threaded part and a third gasket. The third connection threaded part in the third fixing component 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; or, the third connection post can also be arranged on the headrest assembly 59, and the third connection threaded part of the third fixing component 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 the 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 micro-motion adjustment component 40, the second micro-motion adjustment component, the third micro-motion adjustment component, 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 generate corresponding micro-motions following the movement of the user's back and the movement of the head and neck, so as to always fit the user's back and head and neck at all times, provide a better support effect, and have a better sense of comfort.

[0069] In addition, in this embodiment, refer to Figures 1 - 2, 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.

[0070] 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 backrest assembly, characterized in that: The backrest assembly includes a back support assembly, and the back support assembly includes a back support skeleton. A tensioned first mesh is covered on the back support skeleton. A plurality of mesh holes are spaced on the first mesh. The first mesh has a first support area for supporting the human back. The perforation rate of the first support area is greater than that of the part of the first mesh outside the first support area, so that the first mesh can wrap around the human back when subjected to the pressure exerted by the human back.

2. The seat according to claim 1, wherein: There are two first support areas, and the two first support areas are respectively opposite to the scapula positions on both sides of the human back. Alternatively, the perforation rate gradually decreases from the first support area to the connection between the back support skeleton and the first mesh.

3. The seat according to claim 1, characterized in that: The backrest assembly further includes a lumbar support assembly. The lumbar support assembly includes a lumbar support skeleton. A tensioned second mesh is covered on the lumbar support skeleton. A plurality of mesh holes are spaced on the second mesh. The second mesh has a second support area for supporting the human lumbar region. The perforation rate of the second support area is greater than that of the part of the second mesh outside the second support area, so that the second mesh can wrap around the human lumbar region when subjected to the pressure exerted by the human lumbar region.

4. The seat according to claim 3, characterized in that: The second support area is opposite to the iliac bone position of the human body. Alternatively, the perforation rate gradually decreases from the second support area to the connection between the lumbar support skeleton and the second mesh.

5. The seat according to claim 4, characterized in that: The lumbar support skeleton and the back support skeleton are integrally formed, and the first mesh and the second mesh are integrally formed. Alternatively, the lumbar support skeleton and the back support skeleton are separately formed, and the first mesh and the second mesh are respectively covered on the corresponding skeletons.

6. The seat according to claim 1, wherein: The seat further includes a seat cushion assembly. The seat cushion assembly includes a seat cushion frame. A tensioned third mesh is covered on the seat cushion frame. A plurality of mesh holes are spaced on the third mesh. The third mesh has a third support area for supporting the human buttocks. The perforation rate of the third support area is greater than that of the part of the third mesh outside the third support area, so that the third mesh can wrap around the human buttocks when subjected to the pressure exerted by the human buttocks.

7. The seat according to claim 6, characterized in that: The third support area is opposite to the ischium position of the human body. Alternatively, the perforation rate gradually decreases from the third support area to the connection between the seat cushion frame and the third mesh.

8. The seat according to claim 1, characterized in that: The seat further includes a leg support assembly. The leg support assembly includes a leg support skeleton. A tensioned fourth mesh is covered on the leg support skeleton. A plurality of mesh holes are spaced on the fourth mesh. The fourth mesh has a fourth support area for supporting the human calf. The perforation rate of the fourth support area is greater than that of the part of the fourth mesh outside the fourth support area, so that the fourth mesh can wrap around the human calf when subjected to the pressure exerted by the human calf.

9. The seat according to claim 8, wherein: The fourth support area is opposite to the tibia position of the human calf. Alternatively, the perforation rate gradually decreases from the fourth support area to the connection between the leg support skeleton and the fourth mesh.

10. The seat according to any one of claims 1-9, characterized in that: The perforation rate of the first support area is 75%-95%.

11. The seat according to any one of claims 3-5, characterized in that: The perforation rate of the second support area is 75%-95%.

12. The seat according to claim 6 or 7, characterized in that: The perforation rate of the third support area is 75%-95%.

13. The seat according to claim 8 or 9, characterized in that: The perforation rate of the fourth support area is 75%-95%.

14. The seat according to claim 1, characterized in that: The back support assembly is connected to the seat cushion assembly or the base through a connection assembly; the connection assembly 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 back support assembly and are movably connected to the back support assembly; 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; A second fine adjustment assembly is provided between the third connection end and the back support assembly and 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 passing through 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; or, 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 passing through 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.

15. The seat according to claim 1 or 14, characterized in that: The seat further includes a lumbar support assembly, the lumbar 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, the first connection end and the second connection end are respectively arranged on both sides of the lumbar support assembly and are movably connected to the lumbar support assembly; 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; A first fine adjustment assembly is provided between the first connection end and the lumbar support assembly and 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 between the second connection end and the lumbar support assembly; 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 component, 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 component, and the connection assembly and the lumbar support assembly are connected through the connection of the first fixing component 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.

16. The seat according to claim 15, characterized in that: An elevation adjustment component for driving the waist support component to elevate is provided on the connection component; the connection component includes a first connection piece and a second connection piece, the first connection end, the second connection end, the third connection end and the fourth connection end are all provided on the first connection piece, and the second connection piece is connected to the seat cushion component or connected to the base; the elevation adjustment component is arranged between the first connection piece and the second connection piece, and the first connection piece and the second connection piece can move relatively through the elevation adjustment component so that the back support component and the waist support component elevate synchronously.

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