Chair

Abstract

A chair, comprising: a first base; a first linkage support, rotatably connected to the first base; a first backrest, disposed on a side of the first linkage support, and connected to the first linkage support; a first headrest, disposed at a top side of the first backrest; a first seat cushion, disposed on the first base; and a first armrest, disposed on a side of the first seat cushion. When the first linkage support rotates relative to the first base, the first linkage support drives at least one of the first backrest, the first headrest, the first seat cushion, and the first armrest to also move.

Description

Seats Technical Field

[0001] This application relates to the field of seating technology, and in particular to a seating system. Background Technology

[0002] Chairs are commonly seen in offices, study rooms, and other places, meeting people's needs for sitting while working, studying, or resting.

[0003] A chair typically consists of several parts, including a seat cushion, backrest, armrests, and headrest. The backrest, as the component providing support for the back, helps maintain the user's posture and reduces pressure on the neck, back, and lower back. The backrest is usually designed to connect to the seat cushion and can rotate to accommodate different sitting positions, such as upright or reclining. The seat cushion, armrests, and headrest provide corresponding support for the buttocks, arms, and head.

[0004] In related technologies, when a user changes their sitting posture, some parts of the seat are difficult to adapt to the change in the user's sitting posture, resulting in poor comfort when using the seat.

[0005] Application content

[0006] One of the main objectives of this application is to provide a seat designed to improve user comfort when using the seat.

[0007] To achieve the above objectives, this application proposes a seat comprising:

[0008] First base;

[0009] The first linkage bracket is rotatably connected to the first base;

[0010] The first backrest is located on one side of the first linkage bracket and connected to the first linkage bracket;

[0011] The first headrest is located on the top side of the first backrest;

[0012] The first seat cushion is disposed on the first base;

[0013] The first armrest is located on the side of the first seat cushion;

[0014] When the first linkage bracket rotates relative to the first base, the first linkage bracket drives at least one of the first backrest, the first headrest, the first seat cushion, and the first armrest to move together.

[0015] This application also proposes a seat back, the seat back comprising a backrest body and a support member;

[0016] The backrest body is provided with a plurality of openings, which are located on the side of the backrest body along its lateral direction, and each of the openings extends from the edge of its side side toward the other side.

[0017] The backrest body is also provided with two sets of support positions, which are spaced apart along the horizontal or vertical direction of the backrest body. Each set of support positions includes at least one support position, and the support member is connected to the two sets of support positions.

[0018] This application also proposes a seat back assembly, the seat back assembly comprising:

[0019] Second backrest;

[0020] The first backrest support is located on one side of the second backrest and is used to connect the second base of the seat.

[0021] A fifth transmission component, one end of which is configured to connect to the second backrest and the other end of which is configured to connect to the first backrest support;

[0022] The fifth transmission component is slidably connected to the second backrest or the first backrest bracket, so that when the second backrest is subjected to an external force, the second backrest can move relative to the first backrest bracket.

[0023] This application also proposes a seat comprising a second base and a backrest assembly as described above, wherein a first backrest bracket of the backrest assembly is connected to the second base.

[0024] This application also proposes a seat back assembly, the seat back assembly comprising:

[0025] Third backrest;

[0026] The second linkage bracket is located on one side of the third backrest and is rotatably connected to the third base of the seat;

[0027] A first support member, one end of which is movably connected to the third backrest, and the other end of which is rotatably connected to the second linkage bracket;

[0028] The second support member has one end rotatably connected to the first support member or rotatably connected to the third backrest, and the other end of the second support member is connected to the third base.

[0029] This application also proposes a seat comprising a seat body, a third base mounted on the seat body, and a backrest assembly as described above mounted on the seat body.

[0030] This application also proposes a seat, said seat comprising:

[0031] Fourth base;

[0032] The second backrest bracket is rotatably connected to the fourth base and configured to connect to the fourth backrest.

[0033] The second sliding member is slidably disposed on the second backrest bracket;

[0034] The second headrest is disposed on the second sliding member;

[0035] When the second backrest support rotates, the second slider slides on the second backrest support to drive the second headrest to move.

[0036] This application also proposes a seat, said seat comprising:

[0037] The fifth base;

[0038] The third cushion is provided on the fifth base;

[0039] The second armrest is located on the side of the third seat cushion;

[0040] The third backrest support is rotatably connected to the fifth base;

[0041] A linkage mechanism is connected to the second armrest and is also linked to the third backrest support, so that the linkage mechanism drives the second armrest to move when the third backrest support rotates.

[0042] This application also proposes a seat, said seat comprising:

[0043] The sixth base;

[0044] The second linkage frame is movably connected to the sixth base, and the second linkage frame is fixedly connected to the fourth seat cushion of the seat.

[0045] The fourth backrest bracket is rotatably connected to the sixth base, and the fourth backrest bracket is also drive-connected to the second linkage frame. The fourth backrest bracket is configured as the fifth backrest for mounting the seat.

[0046] When the fourth backrest bracket rotates relative to the sixth base, the fourth backrest bracket drives the second linkage frame and the fourth seat cushion to move relative to the sixth base.

[0047] This application also proposes a backrest support assembly for a seat, wherein the backrest support assembly includes:

[0048] The fifth backrest support includes a second backrest support and a second base connection. The second backrest support is used to support the sixth backrest of the seat, and the second base connection can be rotatably connected to the seventh base of the seat.

[0049] The limiting member includes a first part and a second part that is telescopic relative to the first part, one of the first part and the second part being configured to connect one of the fifth backrest support and the seventh base of the seat, and the other of the first part and the second part slidingly engaging with the other of the fifth backrest support and the seventh base of the seat.

[0050] A reset element is provided on the seventh base of the seat, which can apply a force to the fifth backrest support to reset it.

[0051] The first linkage bracket in the seat of this application is linked with at least one of the first backrest, the first headrest, the first seat cushion, and the first armrest. When the first linkage bracket rotates relative to the first base, it will drive the first backrest, the first headrest, the first seat cushion, or the first armrest to move, so that the linkage objects can adapt to the changes in the user's sitting posture, so as to follow the human body parts they support and always provide sufficient support to the human body parts, which can effectively improve the user's comfort when using the seat. Attached Figure Description

[0052] Figure 1 is a structural schematic diagram of the seat in one embodiment of this application;

[0053] Figure 2 is a structural schematic diagram of a portion of the seat in the embodiment of Figure 1;

[0054] Figure 3 is a structural schematic diagram of another part of the seat in the embodiment of Figure 1;

[0055] Figure 4 is a structural schematic diagram of the first transmission component of the seat in the embodiment of Figure 1;

[0056] Figure 5 is a structural schematic diagram of another part of the seat in the embodiment of Figure 1;

[0057] Figure 6 is an exploded view of another part of the seat structure in the embodiment of Figure 1;

[0058] Figure 7 is a schematic diagram of the structure of the first backrest of the seat in the embodiment of Figure 1;

[0059] Figure 8 is an enlarged view of point A in Figure 7;

[0060] Figure 9 is an exploded view of the second transmission component of the seat in the embodiment of Figure 1;

[0061] Figure 10 is a structural schematic diagram of the fourth connecting member of the seat in the embodiment of Figure 9;

[0062] Figure 11 is a structural schematic diagram of the seat in another embodiment of this application;

[0063] Figure 12 is a structural schematic diagram of the seat in another embodiment of this application;

[0064] Figure 13 is a structural schematic diagram of a portion of the seat in the embodiment of Figure 12;

[0065] Figure 14 is a structural schematic diagram of another part of the seat in the embodiment of Figure 13;

[0066] Figure 15 is a structural schematic diagram of another part of the seat in the embodiment of Figure 12;

[0067] Figure 16 is an enlarged view of point B in Figure 15;

[0068] Figure 17 is a structural schematic diagram of another part of the seat in the embodiment of Figure 12;

[0069] Figure 18 is a structural schematic diagram of another part of the seat in the embodiment of Figure 12;

[0070] Figure 19 is a structural schematic diagram of the seat in another embodiment of this application;

[0071] Figure 20 is a structural schematic diagram of a portion of the seat in the embodiment of Figure 19;

[0072] Figure 21 is a schematic diagram of the backrest structure of the seat in one embodiment of this application:

[0073] Figure 22 is an exploded view of the backrest of the seat in the embodiment of Figure 21;

[0074] Figure 23 is a structural schematic diagram of a portion of the seat back in the embodiment of Figure 21;

[0075] Figure 24 is an enlarged view of point C in Figure 23;

[0076] Figure 25 is an exploded view of the backrest support in the embodiment of Figure 21;

[0077] Figure 26 is a structural schematic diagram of another part of the backrest in the embodiment of Figure 21;

[0078] Figure 27 is a structural schematic diagram of the backrest assembly and its components of a seat according to an embodiment of this application;

[0079] Figure 28 is a front view of the backrest assembly in Figure 27;

[0080] Figure 29 is a cross-sectional view of DD in Figure 28;

[0081] Figure 30 is a magnified view of a portion of point E in Figure 29;

[0082] Figure 31 is a schematic diagram of the structure of the fifth transmission component in one embodiment of this application;

[0083] Figure 32 is a schematic diagram of the structure of the first backrest bracket in one embodiment of this application;

[0084] Figure 33 is a magnified view of part F in Figure 32;

[0085] Figure 34 is a rear view of the backrest assembly in Figure 27;

[0086] Figure 35 is a magnified view of a portion of point G in Figure 34;

[0087] Figure 36 is a cross-sectional view at HH in Figure 34;

[0088] Figure 37 is a magnified view of part I in Figure 36;

[0089] Figure 38 is a structural schematic diagram of the sixth transmission component in one embodiment of this application;

[0090] Figure 39 is a structural schematic diagram of the fifth connector in one embodiment of this application;

[0091] Figure 40 is a structural schematic diagram of the sixth connector in one embodiment of this application;

[0092] Figure 41 shows the structure of the seat back assembly and its components in another embodiment of this application;

[0093] Figure 42 is a partial structural schematic diagram of the backrest assembly in Figure 41;

[0094] Figure 43 is a schematic diagram of the backrest component structure in Figure 42 from a frontal view.

[0095] Figure 44 is a cross-sectional view of JJ in Figure 43;

[0096] Figure 45 is a schematic diagram of the backrest component structure in Figure 42 from a rear view.

[0097] Figure 46 is a magnified view of a portion of L in Figure 45;

[0098] Figure 47 is a cross-sectional view of MM in Figure 45;

[0099] Figure 48 is a magnified view of point N in Figure 47;

[0100] Figure 49 is a schematic diagram of the structure of the adapter in one embodiment of this application;

[0101] Figure 50 shows the structure of the seat back assembly and its components in another embodiment of this application;

[0102] Figure 51 is a structural schematic diagram of the seat in one embodiment of this application;

[0103] Figure 52 is a structural schematic diagram of a portion of the seat in the embodiment of Figure 51;

[0104] Figure 53 is a structural schematic diagram of another part of the seat in the embodiment of Figure 51;

[0105] Figure 54 is a structural schematic diagram of another part of the seat in the embodiment of Figure 51;

[0106] Figure 55 is a simplified schematic diagram of the seat in another embodiment of this application;

[0107] Figure 56 is a structural schematic diagram of the seat in another embodiment of this application;

[0108] Figure 57 is a structural schematic diagram of the seat in one embodiment of this application;

[0109] Figure 58 is a structural schematic diagram of a portion of the seat in the embodiment of Figure 57;

[0110] Figure 59 is an enlarged view of point K in the embodiment of Figure 58;

[0111] Figure 60 is a structural schematic diagram of another part of the seat in the embodiment of Figure 57;

[0112] Figure 61 is a structural schematic diagram of another part of the seat in the embodiment of Figure 57;

[0113] Figure 62 is a structural schematic diagram of the seat in another embodiment of this application;

[0114] Figure 63 is a structural schematic diagram of a portion of the seat in the embodiment of Figure 62;

[0115] Figure 64 is a structural schematic diagram of another part of the seat in the embodiment of Figure 62;

[0116] Figure 65 is a structural schematic diagram of another part of the seat in the embodiment of Figure 62;

[0117] Figure 66 is a structural schematic diagram of a portion of the seat in another embodiment of this application;

[0118] Figure 67 is a structural schematic diagram of another part of the seat in another embodiment of this application;

[0119] Figure 68 is a structural schematic diagram of the seat in another embodiment of this application;

[0120] Figure 69 is a structural schematic diagram of the seat in another embodiment of this application;

[0121] Figure 70 is a structural schematic diagram of a portion of the seat structure in one embodiment of this application;

[0122] Figure 71 is a schematic diagram of the structure of the second guide groove and the third sliding member in one embodiment of this application;

[0123] Figure 72 is a structural schematic diagram of the seat in another embodiment of this application;

[0124] Figure 73 is a structural schematic diagram of the seat in another embodiment of this application;

[0125] Figure 74 is a schematic diagram of the backrest support assembly in one embodiment of this application;

[0126] Figure 75 is a structural schematic diagram of a part of the backrest support component in the embodiment of Figure 74;

[0127] Figure 76 is a structural schematic diagram of another part of the backrest support component in the embodiment of Figure 74;

[0128] Figure 77 is a schematic diagram of the structure of the limiting member of the backrest support assembly in the embodiment of Figure 74;

[0129] Figure 78 is a simplified schematic diagram of a backrest support assembly in one embodiment of this application;

[0130] Figure 79 is a structural schematic diagram of another part of the backrest support component in the embodiment of Figure 74;

[0131] Explanation of some of the icon numbers:

[0132] 110. First base; 120. First linkage bracket; 130. First backrest; 140. First headrest; 150. First seat cushion; 160. First armrest; 170. Connecting component; 171. First connecting component; 1711. First transmission component; 1712. Second transmission component; 172. Second connecting component; 1721. Third transmission component; 1722. Fourth transmission component; 181. First linkage component; 182. Second linkage component; 190. First linkage frame; 1100. First linkage assembly; 1110. First connecting rod assembly; 1120. First pulley assembly; 1200. First sliding support assembly;

[0133] 210. Backrest body; 220. Support component; K. Opening; W. Support position; 211. Support rib; 212. Connecting part; 221. First support component; 222. Second support component; 2121. First support structure; 2122. Second support structure; 2123. Fabric covering pressure plate.

[0134] 310. Second backrest; 320. First backrest support; 330. Fifth transmission component; 331. Third connecting end; 332. Fourth connecting end; 340. Sixth transmission component; 342. Sixth connecting end; 350. Second base.

[0135] 410. Third backrest; 420. Second linkage bracket; 430. First support component; 440. Second support component; 451. First mating structure; 452. Second mating structure; 460. Adapter; 461. First connecting part; 462. Second connecting part; 470. Connecting component; 480. Third base.

[0136] 510. Fourth base; 520. Second backrest support; 530. Second sliding member; 531. Backrest connecting part; 540. Second headrest; 541. Headrest support; HQ2. Second sliding cavity; GJ2. Second support member; DZ2. Second guide post; DC2. Second guide groove; HG. Arc-shaped slide rail; 550. Fourth backrest; 560. Transmission structure; 561. Linkage structure; 562. Connecting rope; 570. Second seat cushion; 580. Mounting frame; 590. Rotating member;

[0137] 610. Fifth base; 620. Third seat cushion; 630. Second armrest; 640. Third backrest support; 650. Linkage mechanism; 651. Frame; 652. Second linkage assembly; 653. Second pulley assembly; 654. Transmission assembly; 660. Second sliding support assembly; 655. Linkage component.

[0138] 710, Sixth base; 720, Second linkage frame; 730, Fourth backrest support; 740, Second guide groove; 750, Third sliding member; 760, Third guide groove; 770, Fourth sliding member; 780, Fourth guide groove; 790, Fifth sliding member; 7110, Fourth seat cushion; 7120, Fifth backrest; 7130, Eighth transmission component; 7140, Seventh transmission component.

[0139] 810. Fifth backrest bracket; 811. Second backrest support; 812. Second base support; 820. Limiting component; 821. First part; 822. Second part; 830. Reset component; 840. Rotating component; 850. Sixth backrest; 860. Seventh base.

[0140] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0141] Implementation methods of this application

[0142] The solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments in this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0143] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0144] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0145] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0146] As seating furniture for people to sit on while working, studying or resting, chairs are developing in a more human-centered and intelligent direction, striving to provide users with a comfortable and healthy sitting experience.

[0147] Referring to Figures 1 to 20, which are schematic diagrams of the structure of a seat and its components in one embodiment of this application:

[0148] This application provides a seat, as shown in Figures 1 to 3, the seat comprising:

[0149] First base 110;

[0150] The first linkage bracket 120 is rotatably connected to the first base 110;

[0151] The first backrest 130 is located on one side of the first linkage bracket 120 and connected to the first linkage bracket 120.

[0152] The first headrest 140 is located on the top side of the first backrest 130;

[0153] The first seat cushion 150 is mounted on the first base 110;

[0154] The first armrest 160 is located on the side of the first seat cushion 150;

[0155] When the first linkage bracket 120 rotates relative to the first base 110, the first linkage bracket 120 drives at least one of the first backrest 130, the first headrest 140, the first seat cushion 150 and the first armrest 160 to move together.

[0156] The first linkage bracket 120, as a core component of the seat linkage structure, serves to connect different components and enable them to move together. The first linkage bracket 120 can be located at the rear of the first base 110. The first linkage bracket 120 is generally rod-shaped and extends along the longitudinal direction of the seat. The first linkage bracket 120 includes a backrest support portion and a base connecting portion. The backrest support portion supports the first backrest 130, and the base connecting portion is rotatably connected to the first base 110. The rotatable connection structure between the first linkage bracket 120 and the first base 110 can be configured such that the base connecting portion of the first linkage bracket 120 passes through the first base 110 via a hinge shaft Jz, thus achieving a rotatable connection with the first base 110. Further, as shown in Figure 3, the base connecting portion of the first linkage bracket 120 can be fixedly connected to a rotating frame Xj, which is sleeved on the hinge shaft Jz to form a rotatable connection with the first base 110. This is merely an example and not a limitation.

[0157] When the first linkage bracket 120 is subjected to an external force, it can rotate relative to the first base 110 (e.g., rotate backward or forward) to adjust the tilt angle, thereby adapting to different usage scenarios. Common usage scenarios include sitting upright for work, reclining for work, and lying down for sleep. When the user reclines for sleep, they can lie flat or not. Specifically, taking the angle between the first linkage bracket 120 and the first seat cushion 150 as approximately 90° or 105° when sitting upright for work, the angle between the first linkage bracket 120 and the first seat cushion 150 as approximately 120° or 130° when reclining for work, and the angle between the first linkage bracket 120 and the first seat cushion 150 when lying down for sleep, it can be 150°, 165°, 180°, etc. This is merely illustrative and not restrictive. In other aspects, the first linkage bracket 120 has at least partially overlapping tilt angles in both reclining for work and lying down for sleep scenarios. Furthermore, during the rotation of the first linkage bracket 120, the first linkage bracket 120 can drive the movement of other components connected to it, realizing the linkage between different components. According to the designed function of the seat, the first linkage bracket 120 can be designed to cooperate with other components and / or install other functional components to meet the functional requirements of the seat.

[0158] In this embodiment, at least one of the first backrest 130, the first headrest 140, the first seat cushion 150, and the first armrest 160 is linked to the first linkage bracket 120, and has a mutually cooperating action mechanism with the first linkage bracket 120. The specific connection structure is not detailed here but will be explained in detail in subsequent embodiments. For example, the first backrest 130, the first headrest 140, the first seat cushion 150, or the first armrest 160 may be linked to the first linkage bracket 120; alternatively, the first backrest 130 and the first headrest 140 may be linked to the first linkage bracket 120; or the first seat cushion 150 and the first armrest 160 may be linked to the first linkage bracket 120; or all of the first backrest 130, the first headrest 140, the first seat cushion 150, and the first armrest 160 may be linked to the first linkage bracket 120. This embodiment does not limit the specific connection. When the first linkage bracket 120 rotates relative to the first base 110, it can correspondingly drive the linkage object connected to it to move, so as to adjust the position and / or angle of the linkage object. The linkage object can be any one of the first backrest 130, the first headrest 140, the first seat cushion 150, and the first armrest 160.

[0159] The first linkage bracket 120 in the seat of this application is linked with at least one of the first backrest 130, the first headrest 140, the first seat cushion 150, and the first armrest 160. When the first linkage bracket 120 rotates relative to the first base 110, the first linkage bracket 120 will drive the first backrest 130, the first headrest 140, the first seat cushion 150, or the first armrest 160 to move, so that the linkage objects can adaptively adjust according to the changes in the user's sitting posture, so as to correspond to and follow the human body parts they support, and always provide sufficient support to the human body parts, which can effectively improve the user's comfort when using the seat.

[0160] In some embodiments, as shown in FIG1, the seat further includes:

[0161] At least two connecting components 170 are spaced apart on one side of the first linkage bracket 120 along the longitudinal direction of the first linkage bracket 120 and are connected to the first backrest 130 in a transmission manner.

[0162] At least two connecting components 170 are movably connected to the first linkage bracket 120, and are configured such that when the first linkage bracket 120 rotates relative to the first base 110, the first backrest 130 can move relative to the first linkage bracket 120.

[0163] In addition to the first linkage bracket 120, the seat also includes at least two connecting components 170, which are disposed on one side of the first linkage bracket 120 (i.e., the side of the first linkage bracket 120 facing the human body). In the longitudinal direction of the first linkage bracket 120, at least two connecting components 170 are spaced apart, and each of the at least two connecting components 170 is used to connect to the first backrest 130 of the seat. When the first backrest 130 is connected to the first linkage bracket 120, the first linkage bracket 120 also provides support for the first backrest 130. When using the seat, the user can lean back against the first backrest 130. The first linkage bracket 120 connects to the first backrest 130 through the at least two connecting components 170 and provides support to the first backrest 130, thus supporting the user's back. The structural composition of each connecting component 170 can be the same or different; this embodiment does not limit this. Various specific structural compositions of the connecting components 170 can be adopted, which will not be detailed here but will be further explained in subsequent embodiments. Depending on the different functions and configurations of the first linkage bracket 120, the first linkage bracket 120 can also be called a chair back bracket, backrest bracket, etc.

[0164] The first backrest 130 is connected to the first linkage bracket 120 via a connecting assembly 170, forming a linkage relationship between the first backrest 130 and the first linkage bracket 120. When the first backrest 130 is subjected to a rearward external force (such as pressure applied to the first backrest 130 when the user leans back), this force is transmitted to the first linkage bracket 120 via the connecting assembly 170, causing the first linkage bracket 120 to rotate rearward. Conversely, when the first linkage bracket 120 is subjected to a forward external force, the first linkage bracket 120 drives the first backrest 130 to rotate forward via the connecting assembly 170.

[0165] At least two connecting components 170 are movably connected to the first linkage bracket 120. This movable connection can be a sliding connection, a rotating connection, an elastic connection, etc. The first backrest 130 can have a corresponding movement mode, such as sliding, rotating, or deforming, depending on the movable connection method used between the connecting components 170 and the first linkage bracket 120. The movable connection methods between each connecting component 170 and the first linkage bracket 120 can be the same or different; this embodiment does not impose any restrictions on this.

[0166] Specifically, when force is applied to the first backrest 130, the first backrest 130 will adaptively move on the first linkage bracket 120 via the connecting component 170. Furthermore, when force is applied to the first backrest 130 or the first linkage bracket 120 to cause the first linkage bracket 120 to rotate, the connecting component 170 will move, and the first backrest 130 will simultaneously adaptively adjust its angle and / or position.

[0167] The present application provides a connecting component 170 that is movably connected to the first backrest 130 and the first linkage bracket 120 of the seat. When the user leans back against the first backrest 130 and causes the first linkage bracket 120 to rotate relative to the first base 110 of the seat, the first backrest 130 can move relative to the first linkage bracket 120 as the first linkage bracket 120 rotates, so as to adapt to the user's sitting posture and conform to the user's body curve.

[0168] In the backrest design of related chairs, although the backrest can accommodate the user's reclining / lying-back movements, it cannot synchronize with the user's back movement; it can only tilt and rotate relative to the chassis. When the user reclines, relative slippage occurs between the backrest and the user's back, preventing the backrest from continuously conforming to and supporting the entire surface of the user's back. This is especially noticeable in the lower back area, where the relative displacement between the back and the backrest results in insufficient or absent support. This design flaw causes the lower back to lose necessary support when reclining, thus affecting user comfort and spinal health.

[0169] In this application, the first backrest 130 and the first linkage bracket 120 can be movably connected, that is, the first backrest 130 can move relative to the first linkage bracket 120.

[0170] Specifically, in some embodiments, as shown in FIG1, at least two connecting components 170 include:

[0171] The first connecting component 171 is slidably connected to the first linkage bracket 120 and is also connected to the first backrest 130 via transmission.

[0172] In the seat design of this application, the first backrest 130 is movably mounted on the first linkage bracket 120, and the first backrest 130 can move relative to the first linkage bracket 120 as the first linkage bracket 120 rotates. Specifically, when a user leans against the first backrest 130 and applies force to the first backrest 130, intending to tilt the first backrest 130 backward relative to the first base 110 of the seat, the first backrest 130 can move relative to the first linkage bracket 120 through the first connecting component 171 to adapt to the user's reclining / lying-back movements. Thus, when the user leans against the first backrest 130 and reclines / lyes back, the first backrest 130 can adjust to the change in the user's posture, thereby providing better comfort and support.

[0173] For example, the first backrest 130 is movable relative to the first linkage bracket 120. The first backrest 130 is slidably connected to the first linkage bracket 120 through the first connecting component 171, that is, the first backrest 130 can slide on the first linkage bracket 120.

[0174] The connection form between the first connecting component 171 and the first backrest 130 can be a fixed connection, a movable connection, etc. This embodiment does not limit this, as long as the power transmission between the first connecting component 171 and the first backrest 130 can be realized.

[0175] In some embodiments, as shown in Figures 1 and 2, the first connection component 171 includes:

[0176] The first transmission component 1711 is slidably disposed on the first linkage bracket 120 and is transmissionally connected to the first backrest 130.

[0177] The first transmission component 1711 is mounted on the first linkage bracket 120 and can slide on the first linkage bracket 120. Specifically, the first transmission component 1711 can adopt a structure such as a slide rod, slide cylinder, slide seat, slide frame, slide rail, etc., to slide and cooperate with the first linkage bracket 120, realizing a slidable setting on the first linkage bracket 120. On the first linkage bracket 120, the first transmission component 1711 can be set on the upper part of the first linkage bracket 120, corresponding to the upper half of the first backrest 130 (which can also be regarded as the part of the first backrest 130 used to support the back of the human body). The first backrest 130 and the first transmission component 1711 are connected by a transmission connection. Through the first transmission component 1711, the first backrest 130 can slide relative to the first linkage bracket 120, that is, the first transmission component 1711 supports the sliding of the first backrest 130 on the first linkage bracket 120.

[0178] The power source for the sliding of the first transmission component 1711 can be as follows:

[0179] Firstly, when the user leans against the first backrest 130, the force applied to the first backrest 130 increases when the user leans back. The force on the first backrest 130 acts simultaneously on the first transmission component 1711 and the first linkage bracket 120, causing the first linkage bracket 120 to rotate backward and simultaneously causing the first transmission component 1711 to slide on the first linkage bracket 120, thereby supporting the first backrest 130 to slide relative to the first linkage bracket 120.

[0180] Secondly, a linkage structure can be configured based on the first transmission component 1711, which connects the first transmission component 1711 to the first base 110 or the first seat cushion 150 of the seat. When the user applies force directly to the first linkage bracket 120 or the user leans back against the first backrest 130 to rotate the first linkage bracket 120 backward, the linkage structure drives the first transmission component 1711 to move in tandem. Specifically, the first transmission component 1711 can be pulled so that it slides on the first linkage bracket 120, and the first transmission component 1711 in turn drives the first backrest 130 to slide relative to the first linkage bracket 120.

[0181] Third, the first transmission component 1711 is also connected to other components of the seat (such as the first headrest 140). By applying force to the corresponding components, the force acts synchronously on the first transmission component 1711 and the first linkage bracket 120, so that the first linkage bracket 120 rotates backward and at the same time the first transmission component 1711 slides on the first linkage bracket 120, thereby supporting the first backrest 130 to slide relative to the first linkage bracket 120.

[0182] That is, when the first linkage bracket 120 rotates relative to the first base 110, the first backrest 130 slides on the first linkage bracket 120 through the first transmission component 1711, and the first transmission component 1711 supports the first backrest 130 to slide on the first linkage bracket 120; or, the first transmission component 1711 slides on the first linkage bracket 120 to drive the first backrest 130 to slide relative to the first linkage bracket 120.

[0183] In this embodiment, when a user sits in the seat and leans back against the first backrest 130, the first backrest 130 and the first linkage bracket 120 rotate relative to the first base 110. At the same time, the first transmission component 1711 slides on the first linkage bracket 120 (e.g., slides downward) to drive the first backrest 130 to move (e.g., slide downward) to adjust the position and / or angle of the first backrest 130, so that the first backrest 130 follows the user's body part (e.g., back) to provide support, adapts to the user's posture changes, and improves the user's comfort when using the seat.

[0184] In some embodiments, as shown in Figures 2 to 4, the first linkage bracket 120 is provided with a first sliding cavity HQ1 extending along its longitudinal direction, and the first transmission member 1711 is inserted into the first sliding cavity HQ1 and slides in cooperation with the first sliding cavity HQ1.

[0185] The first sliding cavity HQ1 on the first linkage bracket 120 is adapted to the first transmission component 1711, which is slidably mounted on the first linkage bracket 120 by being inserted into the first sliding cavity HQ1. The first transmission component 1711 can be a sliding rod. Optionally, as shown in Figure 3, the first sliding cavity HQ1 is located at the upper part of the first linkage bracket 120, and the top of the first linkage bracket 120 has a first cavity opening QK1 communicating with the first sliding cavity HQ1. This first cavity opening QK1 is adapted to the outer contour of the first transmission component 1711, and the first transmission component 1711 is inserted into the first sliding cavity HQ1 through the first cavity opening QK1. The extension length of the first sliding cavity HQ1 is not limited and can be set according to actual conditions.

[0186] When the first linkage bracket 120 rotates, the first transmission component 1711 slides along the first sliding cavity HQ1. For example, when a user sits in the seat and leans back against the first backrest 130, the first linkage bracket 120 rotates relative to the first base 110 toward the rear of the seat. At this time, the first transmission component 1711 slides downward along the first sliding cavity HQ1 of the first linkage bracket 120 (the first transmission component 1711 continuously slides into the first sliding cavity HQ1 at the first cavity opening QK1) to drive the first backrest 130 to move downward in whole or in part, so as to adjust the position and / or angle of the first backrest 130; or, when the user changes from leaning back to sitting upright, the first linkage bracket 120 rotates relative to the first base 110 toward the front of the seat. At this time, the first transmission component 1711 slides upward along the first sliding cavity HQ1 of the first linkage bracket 120 (the first transmission component 1711 slides outward from the first cavity opening QK1 within the first sliding cavity HQ1) to drive the first backrest 130 to move upward in whole or in part, so as to adjust the position and / or angle of the first backrest 130.

[0187] The first transmission component 1711 is slidably mounted on the first linkage bracket 120 by being inserted into the first sliding cavity HQ1 constructed by the first linkage bracket 120. It does not occupy additional thickness space in the front-back direction of the seat, nor does it occupy additional width space in the left-right direction of the seat.

[0188] In some embodiments, at least one of the first linkage bracket 120 and the first transmission member 1711 is provided with a first sliding structure, which is configured to support the first transmission member 1711 to slide along the first sliding cavity HQ1.

[0189] The first transmission component 1711 slides along the first sliding cavity HQ1 under the support of the first sliding structure. The first sliding structure can be provided on the first linkage bracket 120, or on the first transmission component 1711, or both the first linkage bracket 120 and the first transmission component 1711 can be provided with the first sliding structure.

[0190] The first sliding structure can take various forms. For example, it may include a sliding groove in which the first transmission member 1711 is partially housed, allowing it to slide by means of the groove's support. This is merely an example and not a limitation. In practical applications, when either the first linkage bracket 120 or the first transmission member 1711 is provided with a first sliding structure, the first sliding structure can take, but is not limited to, one structural form.

[0191] With the support of the first sliding structure, the first transmission component 1711 can slide smoothly along the first sliding cavity HQ1, which helps to improve the operational stability of the backrest sliding system.

[0192] In some embodiments, as shown in FIG3, the first sliding structure includes at least one first support member GJ1, which is rotatably disposed on one of the first linkage bracket 120 and the first transmission member 1711, and forms a rolling contact with the other of the first linkage bracket 120 and the first transmission member 1711.

[0193] The first sliding structure employs a first support member GJ1, which is rotatably mounted on the object being set (the first linkage bracket 120 or the first transmission member 1711) and arranged on the wall surface of the object being set to contact another object. Optionally, at least one first support member GJ1 is rotatably disposed on the first linkage bracket 120 and located on the inner wall of the first sliding cavity HQ1, forming a rolling contact with the first transmission member 1711.

[0194] The device includes at least one first support member GJ1; that is, it may have one or more first support members GJ1, such as two or three. When there are more than one first support member GJ1, these members may be spaced apart along the circumferential, transverse, or longitudinal direction of the object being supported. Optionally, the first support member GJ1 may include a support wheel connected to a mounting shaft. The wall surface of the object being supported has a mounting groove, and the support wheel is at least partially accommodated in the mounting groove and rotatably mounted on the wall surface of the object being supported via the mounting shaft.

[0195] When the first transmission component 1711 slides along the first sliding cavity HQ1, the first support component GJ1, which is in contact with the first transmission component 1711 or the first linkage bracket 120, rotates accordingly. That is, the first support component GJ1 rolls along the surface of the first transmission component 1711 or the first linkage bracket 120 to support the first transmission component 1711 in sliding along the first sliding cavity HQ1. The first support component GJ1 significantly reduces the frictional resistance between the first linkage bracket 120 and the first transmission component 1711, allowing the first transmission component 1711 to slide more easily and smoothly.

[0196] Optionally, at least one first support member GJ1 is rotatably disposed on one of the first linkage bracket 120 and the first transmission member 1711, and the other is provided with a first support groove extending in its longitudinal direction. The first support member GJ1 is accommodated in the first support groove and forms rolling contact with the bottom wall of the first support groove. The first support groove provides a clear movement trajectory for the first support member GJ1, ensuring that the first support member GJ1 moves in a predetermined direction, thereby achieving precise guidance for the sliding of the first transmission member 1711.

[0197] In some embodiments, as shown in Figures 3 and 4, a first guide post DJ1 is provided on one of the outer wall of the first transmission member 1711 and the inner wall of the first sliding cavity HQ1, and a first guide groove DC1 is provided on the other. The first guide post DJ1 is inserted into the first guide groove DC1 and slides in cooperation with the first guide groove DC1 to guide the first transmission member 1711 to slide along the first sliding cavity HQ1.

[0198] In this embodiment, a first guide post DJ1 may be provided on the outer wall of the first transmission member 1711, and a first guide groove DC1 may be provided on the inner wall of the first sliding cavity HQ1 to slide in cooperation with the first guide post DJ1; alternatively, a first guide post DJ1 may be provided on the inner wall of the first sliding cavity HQ1, and a first guide groove DC1 may be provided on the outer wall of the first transmission member 1711 to slide in cooperation with the first guide post DJ1. The guiding structure of the first guide post DJ1 and the first guide groove DC1 may be provided in one or more sets. When more than one set of the guiding structure is provided, the more than one set of guiding structures may be spaced apart along the circumferential or transverse direction of the first linkage bracket 120. The first transmission member 1711 is guided to slide in a predetermined direction when sliding along the first sliding cavity HQ1 through the cooperation of the first guide post DJ1 and the first guide groove DC1. Specifically, when the first transmission component 1711 slides along the first sliding cavity HQ1, the first guide post DJ1 slides in the first guide groove DC1 to precisely guide the sliding direction of the first transmission component 1711.

[0199] In some embodiments, as shown in Figures 1, 2, and 5, the first connection component 171 further includes:

[0200] The second transmission component 1712 is movably connected to the first transmission component 1711, and the first transmission component 1711 is connected to the first backrest 130 through the second transmission component 1712.

[0201] In addition to the first transmission member 1711, the first connecting assembly 171 also includes a second transmission member 1712. The second transmission member 1712 is located between the first transmission member 1711 and the first backrest 130 and is connected to both of them to form a transmission connection between them. The second transmission member 1712 can be a single member or a combination of multiple members, and this embodiment does not limit this.

[0202] When a user leans against the first backrest 130, the first backrest 130 is subjected to the force applied by the user. When the user's posture changes, the force on the first backrest 130 (such as the magnitude, direction, and position of the force) changes with the user's posture and is transmitted to the second transmission component 1712. The second transmission component 1712 drives the first backrest 130 to move relative to the first transmission component 1711. The first backrest 130 adaptively adjusts its angle and / or position to provide support for the human body parts. Among them, the human body parts can be the back and / or waist.

[0203] In some embodiments, as shown in Figures 5 and 6, the second transmission member 1712 includes:

[0204] The first connecting member 17121 is rotatably connected to the first transmission member 1711;

[0205] At least two sets of second connectors 17122 are respectively disposed on opposite sides of the first connector 17121;

[0206] Each set of second connectors 17122 includes at least one second connector 17122, each second connector 17122 is movably connected to the first connector 17121, and the first connector 17121 is movably connected to the first backrest 130 through at least two sets of second connectors 17122.

[0207] The first connecting member 17121 is disposed between the first transmission member 1711 and the first backrest 130. In addition to supporting the first backrest 130, the first connecting member 17121 also establishes a transmission connection between the first transmission member 1711 and the first backrest 130. Force can be transmitted between the first transmission member 1711 and the first backrest 130 through the first connecting member 17121. For example, when the first transmission member 1711 slides on the first linkage bracket 120, the first backrest 130 is driven to slide relative to the first linkage bracket 120 through the first connecting member 17121.

[0208] The first connecting member 17121 and the first transmission member 1711 are rotatably connected, forming a mutually rotatable connection. Furthermore, the first connecting member 17121 is connected to the first backrest 130. This connection can be direct or via an intermediate member, and can be achieved through methods such as rotational or sliding connections. This embodiment does not impose any limitations on this connection. When a user leans against the first backrest 130, the first backrest 130 is subjected to the force applied by the user. As the user's posture changes, the force on the first backrest 130 (such as magnitude, direction, and position) changes accordingly and is transmitted to the first connecting member 17121. This causes the first connecting member 17121 to rotate the first backrest 130 relative to the first transmission member 1711. The first backrest 130 adaptively adjusts its angle and / or position to closely fit and support the body, providing good fit and support, thus enhancing the user's comfort when using the chair.

[0209] The connection between the first connector 17121 and the first transmission component 1711 can be configured in the following two ways:

[0210] Firstly, the first transmission component 1711 has a backrest connection structure, on which a connecting shaft passes. The first connecting member 17121 is connected to the connecting shaft to form a hinged (i.e., rotating connection) relationship with the backrest connection structure. Thus, the first connecting member 17121 can rotate relative to the first transmission component 1711 through the connecting shaft.

[0211] Secondly, the first transmission component 1711 has a backrest connection structure with a sliding hole through which a sliding shaft passes. The first connecting member 17121 is connected to or integrally formed with the sliding shaft, thus forming both a rotational and sliding connection with the backrest connection structure. Therefore, the first connecting member 17121 can rotate or slide relative to the first transmission component 1711 via the sliding shaft. Consequently, when the first backrest 130 moves relative to the first transmission component 1711, the position and / or angle of the first backrest 130 can change in various ways, allowing it to better conform to the body and provide sufficient support. The above two structural configurations are merely exemplary and not limiting, and include, but are not limited to, these examples.

[0212] Optionally, the first connector 17121 has two opposing support portions, located on opposite sides of the first connector 17121 and connected to the first backrest 130 respectively. The two support portions on opposite sides of the first connector 17121 may extend in a direction perpendicular to the first connector 17121, forming an "H"-shaped component when combined with the two support portions. Alternatively, the support portions may be non-extending, such as having a square, circular, or triangular shape. The support portions may be directly connected to the first backrest 130 or connected to the first backrest 130 via other intermediate components.

[0213] Optionally, the support portion is movably connected to the first backrest 130. The movable connection can take the form of a rotatable connection, a sliding connection, an elastic connection, etc., and this embodiment does not limit this. Because the support portion is movably connected to the first backrest 130, the first backrest 130 can be allowed to move relative to the first connector 17121 to adjust according to different user body types and / or postures, adapting to the body shape and posture of the human body, and providing support and cushioning.

[0214] Specifically, in addition to the first transmission member 1711 and the first connector 17121, the first connecting assembly 171 also includes at least two sets of second connectors 17122 respectively disposed on opposite sides of the first connector 17121. The second connectors 17122 are located between the first connector 17121 and the first backrest 130, and are movably connected to both the first connector 17121 and the first backrest 130. The movable connection can be any of the two structural configurations for the connection between the first connector 17121 and the first transmission member 1711 in the aforementioned embodiments, including but not limited to these.

[0215] One or more second connectors 17122 may be provided on each of the opposite sides of the first connector 17121, and each second connector 17122 is movably connected to the first backrest 130. This movable connection between the second connectors 17122, the first connector 17121, and the first backrest 130 allows for more flexible relative movement between the first backrest 130 and the first connectors 17121, enabling the first backrest 130 to better conform to the human body curve and provide more comfortable support.

[0216] In some embodiments, as shown in Figures 7 to 9, one of the first backrest 130 and the second connector 17122 is provided with a first receiving cavity Q1, and the other is provided with a first mating member J1. The first mating member J1 is received in the first receiving cavity Q1 so that the second connector 17122 is movably connected to the first backrest 130.

[0217] Specifically, the first backrest 130 may have a first receiving cavity Q1, and the second connector 17122 may have a first mating member J1. The second connector 17122 may be received in the first receiving cavity Q1 on the first backrest 130 through the first mating member J1, so as to form a movable connection with the first backrest 130. Alternatively, the second connector 17122 may have a first receiving cavity Q1, and the first backrest 130 may have a first mating member J1. The first backrest 130 may be received in the first receiving cavity Q1 on the second connector 17122 through the first mating member J1, so as to form a movable connection with the second connector 17122.

[0218] The first mating component J1 can be a ball connector, an elastic component (such as a spring), flexible silicone, etc., and this embodiment does not impose any restrictions on it. When the first mating component J1 is a ball connector, the ball connection end of the ball connector is housed in the first receiving cavity Q1 and can move and / or rotate within the first receiving cavity Q1.

[0219] The first mating part J1 is movably connected to the first backrest 130, allowing the first backrest 130 to rotate and / or move in multiple directions relative to the second connecting part 17122. This overcomes the limitations of traditional fixed connections and enables the first backrest 130 to be adjusted according to the user's posture.

[0220] Taking the first mating member J1 as an example, when the user leans against the first backrest 130, the first mating member J1 can move within the first receiving cavity Q1. The change in the user's reclining posture causes the first mating member J1 to move and / or rotate within the first receiving cavity Q1, thereby adjusting the angle and / or position of the first backrest 130 relative to the second connecting member 17122. This allows the first backrest 130 to adapt to the user's body curve when reclining, improving the comfort of support.

[0221] In some embodiments, as shown in FIG1, at least two connecting components 170 further include:

[0222] The second connecting component 172 is rotatably connected to the first linkage bracket 120 and is also connected to the first backrest 130 via transmission.

[0223] In the longitudinal direction of the first linkage bracket 120, the first connecting component 171 and the second connecting component 172 are distributed vertically at intervals. The first backrest 130 is rotatably connected to the first linkage bracket 120 through the second connecting component 172, that is, the first backrest 130 can rotate relative to the first linkage bracket 120. The connection between the second connecting component 172 and the first backrest 130 can be a fixed connection, a movable connection, etc., and this embodiment does not limit this, as long as the transmission of power between the second connecting component 172 and the second backrest can be achieved.

[0224] That is, the first backrest 130 moves relative to the first linkage bracket 120, which may specifically include: the first backrest 130 sliding relative to the first linkage bracket 120 through the first connecting component 171, and simultaneously rotating relative to the first linkage bracket 120 through the second connecting component 172, so as to change the angle and / or position.

[0225] Through the sliding connection design of the first connecting component 171 and the rotating connection design of the second connecting component 172, the first backrest 130 can move relative to the first linkage bracket 120. When the first backrest 130 is subjected to an external force (such as the force exerted on the first backrest 130 by a person leaning back against the first backrest 130), the first backrest 130 will move relative to the first linkage bracket 120. For example, during the process of the user leaning back, the first backrest 130 follows the user's back and / or waist, thereby adapting to the user's sitting posture changes and providing the user with more comfortable support, which can improve the user's comfort when using the chair.

[0226] In some embodiments, as shown in Figures 1, 2, and 5, the second connection component 172 includes:

[0227] The third transmission component 1721 is rotatably connected to the first linkage bracket 120 and is transmissionally connected to the first backrest 130.

[0228] The third transmission component 1721 is mounted on the first linkage bracket 120 and can rotate on the first linkage bracket 120. Specifically, the third transmission component 1721 can adopt a structure such as a rotating rod, a rotating frame, or a connecting rod to be rotatably connected to the first linkage bracket 120, thus achieving a rotatable setting on the first linkage bracket 120. On the first linkage bracket 120, the third transmission component 1721 can be set at the lower part of the first linkage bracket 120 to correspond to the lower half of the first linkage bracket 120 (which can also be regarded as the part of the backrest used to support the waist of the human body). The first backrest 130 and the third transmission component 1721 are connected by a transmission connection. Through the provided third transmission component 1721, the first backrest 130 can rotate relative to the first linkage bracket 120, and at the same time, the third transmission component 1721 supports the rotation of the first backrest 130 on the first linkage bracket 120.

[0229] The power source for the rotation of the third transmission component 1721 may be as follows:

[0230] When a user leans against the first backrest 130, the force applied to the first backrest 130 increases when the user leans back. The force on the first backrest 130 acts synchronously on the third transmission component 1721 and the first linkage bracket 120, causing the first linkage bracket 120 to rotate backward and simultaneously causing the third transmission component 1721 to rotate on the first linkage bracket 120, thereby supporting the first backrest 130 to rotate relative to the first linkage bracket 120.

[0231] That is, when the first linkage bracket 120 rotates relative to the base, the first backrest 130 rotates on the first linkage bracket 120 through the third transmission component 1721.

[0232] In this embodiment, when a user sits in the chair and leans back against the first backrest 130, the first backrest 130 and the first linkage bracket 120 rotate relative to the first base 110. At the same time, the third transmission component 1721 rotates on the first linkage bracket 120 (for example, the end of the third transmission component 1721 connected to the first backrest 130 rotates downward) to drive the first backrest 130 to move (for example, move towards the first base 110) to adjust the position and / or angle of the first backrest 130. This allows the first linkage bracket 120 to follow the user's body parts (such as the back and / or waist) for support, adapting to changes in the user's posture and improving the user's comfort when using the chair.

[0233] In some embodiments, as shown in Figures 5 and 6, the second connection component 172 further includes:

[0234] The fourth transmission component 1722 is movably connected to the third transmission component 1721, and the third transmission component 1721 is connected to the first backrest 130 through the fourth transmission component 1722.

[0235] In addition to the third transmission member 1721, the second connecting assembly 172 also includes a fourth transmission member 1722. The fourth transmission member 1722 is located between the third transmission member 1721 and the first backrest 130 and is connected to both of them to form a transmission connection between them. The fourth transmission member 1722 can be a single member or a combination of multiple members, and this embodiment does not limit this.

[0236] When used to lean against the first backrest 130, the first backrest 130 is subjected to the force applied by the user. When the user's posture changes, the force on the first backrest 130 (such as the magnitude, direction, position, etc.) changes with the user's posture and is transmitted to the fourth transmission component 1722. The fourth transmission component 1722 drives the first backrest 130 to move relative to the third transmission component 1721. The first backrest 130 adaptively adjusts its angle and / or position to provide support for the human body.

[0237] In some embodiments, as shown in Figures 1, 2, and 5, the fourth transmission member 1722 includes:

[0238] The third connecting member 17221 is rotatably connected to the third transmission member 1721;

[0239] At least two sets of fourth connectors 17222 are respectively disposed on opposite sides of the third connector 17221;

[0240] Each set of fourth connectors 17222 includes at least one fourth connector 17222, each fourth connector 17222 is movably connected to the third connector 17221, and the third connector 17221 is movably connected to the first backrest 130 through at least two sets of fourth connectors 17222.

[0241] The third connecting member 17221 is disposed between the third transmission member 1721 and the first backrest 130. In addition to supporting the first backrest 130, the third connecting member 17221 also establishes a transmission connection between the third transmission member 1721 and the first backrest 130. Force can be transmitted between the third transmission member 1721 and the first backrest 130 through the third connecting member 17221. For example, when the third transmission member 1721 rotates on the first linkage bracket 120, it correspondingly drives the first backrest 130 to rotate relative to the first linkage bracket 120 through the third connecting member 17221.

[0242] The third connecting member 17221 and the third transmission member 1721 are rotatably connected, forming a mutually rotatable connection. The third connecting member 17221 is also connected to the first backrest 130. This connection can be direct or via an intermediate member, and the connection method can be a rotating connection, a sliding connection, or other similar methods; this embodiment does not impose any limitations on this. When a user leans against the first backrest 130, the first backrest 130 is subjected to the force applied by the user. When the user's posture changes, the force on the first backrest 130 (such as the magnitude, direction, and position of the force) changes accordingly and is transmitted to the third connecting member 17221. This causes the third connecting member 17221 to rotate the first backrest 130 relative to the third transmission member 1721. The first backrest 130 adaptively adjusts its angle and / or position to closely fit and support the body, providing good fit and support, thus improving the user's comfort when using the seat.

[0243] The connection between the third connector 17221 and the third transmission component 1721 can be configured in the following two ways:

[0244] Firstly, the third transmission component 1721 has a backrest connection structure, on which a connecting shaft passes. The third connecting member 17221 is connected to the connecting shaft to form a hinged (i.e., rotating connection) relationship with the backrest connection structure. Thus, the third connecting member 17221 can rotate relative to the third transmission component 1721 through the connecting shaft.

[0245] Secondly, the third transmission component 1721 is constructed with a backrest connection structure, which has a sliding hole through which a sliding shaft passes. The third connector 17221 is connected to the sliding shaft, forming both a hinged (i.e., rotational connection) and a sliding connection with the backrest connection structure. Thus, the third connector 17221 can rotate or slide relative to the third transmission component 1721 via the sliding shaft. Therefore, when the first backrest 130 moves relative to the third connector 17221, the position and / or angle of the first backrest 130 can change in various ways, allowing the first backrest 130 to better conform to the body and provide sufficient support. The above two structural configurations are merely exemplary and not limiting, and include, but are not limited to, these examples.

[0246] Taking the first connector 17121 as a reference, the third connector 17221 can also be provided with a corresponding support. The specific structural settings are as described in the above embodiment and will not be repeated here.

[0247] Specifically, in addition to the third transmission member 1721 and the third connector 17221, the second connecting assembly 172 also includes at least two sets of fourth connectors 17222 respectively disposed on opposite sides of the third connector 17221. The fourth connectors 17222 are located between the third connector 17221 and the first backrest 130, and are movably connected to both the third connector 17221 and the first backrest 130. The movable connection can be any of the two structural configurations for the connection between the third connector 17221 and the third transmission member 1721 in the aforementioned embodiments, including but not limited to these.

[0248] One or more fourth connectors 17222 can be correspondingly provided on each of the opposite sides of the third connector 17221, and each fourth connector 17222 is movably connected to the first backrest 130. The movable connection between the fourth connector 17222 and the third connector 17221 and the first backrest 130 allows for more flexible relative movement between the first backrest 130 and the third connector 17221, enabling the first backrest 130 to better conform to the human body curve and provide more comfortable support.

[0249] In some embodiments, as shown in Figures 7, 8 and 10, one of the first backrest 130 and the fourth connector 17222 is provided with a second receiving cavity Q2, and the other is provided with a second mating member J2. The second mating member J2 is received in the second receiving cavity Q2 so that the fourth connector 17222 is movably connected to the first backrest 130.

[0250] Specifically, the first backrest 130 may have a second receiving cavity Q2, and the fourth connector 17222 may have a second mating member J2. The fourth connector 17222 may be received in the second receiving cavity Q2 on the first backrest 130 through the second mating member J2, so as to form a movable connection with the first backrest 130. Alternatively, the fourth connector 17222 may have a second receiving cavity Q2, and the first backrest 130 may have a second mating member J2. The first backrest 130 may be received in the second receiving cavity Q2 on the fourth connector 17222 through the second mating member J2, so as to form a movable connection with the fourth connector 17222.

[0251] The second mating component J2 can be a ball connector, an elastic component (such as a spring), flexible silicone, etc., and this embodiment does not impose any restrictions on this. When the second mating component J2 is a ball connector, the ball connection end of the ball connector is housed in the second receiving cavity Q2 and can move and / or rotate within the second receiving cavity Q2.

[0252] The second mating part J2 is movably connected to the first backrest 130, allowing the first backrest 130 to rotate and / or move in multiple directions relative to the fourth connecting part 17222. This overcomes the limitations of traditional fixed connections and enables the first backrest 130 to be adjusted according to the user's posture.

[0253] Taking the second mating component J2 as an example, when the user leans against the first backrest 130, the second mating component J2 can move within the second receiving cavity Q2. The change in the user's reclining posture causes the second mating component J2 to move and / or rotate within the second receiving cavity Q2, thereby adjusting the angle and / or position of the first backrest 130 relative to the fourth connecting component 17222. This allows the first backrest 130 to adapt to the user's body curve when reclining, improving the comfort of support.

[0254] In some embodiments, as shown in FIG2, the seat further includes:

[0255] The first linkage component 181 is connected at one end to the first connecting component 171 and at the other end to the second connecting component 172.

[0256] Specifically, through the provided first linkage component 181, a stable linkage relationship is formed between the first connecting component 171 and the second connecting component 172, meaning that the second connecting component 172, the first linkage component 181, and the first connecting component 171 have a mutually cooperating action mechanism. For example, when the first linkage bracket 120 rotates relative to the first base 110 or the first backrest 130 moves relative to the first linkage bracket 120, causing the second connecting component 172 to move, the second connecting component 172 drives the first connecting component 171 to move through the first linkage component 181.

[0257] In conjunction with the above embodiments, based on the structural composition of the first connecting component 171 and the second connecting component 172, optionally, one end of the first linkage member 181 is connected to the first transmission member 1711, and the other end of the first linkage member 181 is hinged to the third transmission member 1721. The first linkage member 181 can be a first linkage rod. For example, when the user leans back against the first backrest 130, the first linkage bracket 120 rotates towards the rear of the seat, simultaneously causing the third transmission member 1721 to rotate and drive the first linkage rod to move, pulling the first transmission member 1711 down from its initial position via the first linkage rod; when the user changes from leaning back to sitting upright, the first linkage bracket 120 rotates towards the front of the seat, simultaneously causing the third transmission member 1721 to rotate and drive the first linkage rod to move, moving the first transmission member 1711 up to return to its initial position via the first linkage rod.

[0258] In some embodiments, as shown in Figures 1 and 2, the seat further includes:

[0259] The second linkage component 182 is hinged at one end to the second connecting component 172 or the first backrest 130, and the other end is configured to be connected to the first base 110 or the first seat cushion 150.

[0260] Since the connection between the second connecting component 172 and the first backrest 130 and the first linkage bracket 120 is movable, the first backrest 130, the second connecting component 172, and the first linkage bracket 120 form a free mechanism. By further setting the second linkage member 182 as a supporting base for the second connecting component 172 or the first backrest 130, when the first backrest 130 and / or the first linkage bracket 120 are not subjected to external forces, the second connecting component 172 or the first backrest 130 can maintain a stable state relative to the first base 110, so that the first backrest 130, the second connecting component 172, the first linkage bracket 120, and the second linkage member 182 form a stable linkage mechanism. Furthermore, the second linkage member 182 also forms a linkage relationship with the second connecting component 172, and there is a mutually cooperating action mechanism between the second linkage member 182 and the second connecting component 172. When the first linkage bracket 120 rotates relative to the first base 110 or the first backrest 130 moves relative to the first linkage bracket 120, causing the second connecting component 172 to move, the second connecting component 172 can move relative to the first base 110 through the second linkage member 182. During this process, the second linkage member 182 moves synchronously and plays the role of supporting the second connecting component 172 and thus supporting the first backrest 130.

[0261] In conjunction with the above embodiments, based on the structural composition of the second connecting component 172, optionally, one end of the second linkage component 182 is hinged to the third transmission component 1721, and the other end of the second linkage component 182 is hinged to the first base 110; or, one end of the second linkage component 182 is hinged to the first backrest 130, and the other end of the second linkage component 182 is fixedly connected to the first base 110. The second linkage component 182 may be a second linkage rod.

[0262] In some embodiments, as shown in FIG1, the first connecting component 171 is also connected to the first headrest 140 for moving the first headrest 140 when the first linkage bracket 120 rotates relative to the first base 110.

[0263] In the seat design of this application, the first headrest 140 is movably disposed on the first linkage bracket 120, and the first headrest 140 can move relative to the first linkage bracket 120 as the first linkage bracket 120 rotates. Specifically, when the user leans against the first backrest 130 and applies force to the first backrest 130 to rotate the first linkage bracket 120 relative to the first base 110 of the seat, the first headrest 140 can be moved by the first connecting component 171 to adapt to the user's reclining / lying-back movements. Thus, when the user leans against the first backrest 130 and reclines / lyes back, the first headrest 140 can adjust to the user's posture, thereby providing better comfort and support.

[0264] For example, the first headrest 140 is movable relative to the first linkage bracket 120. The first headrest 140 is slidably connected to the first linkage bracket 120 through the first connecting component 171, that is, the first headrest 140 can slide on the first linkage bracket 120.

[0265] In some embodiments, as shown in FIG1, the first connection component 171 includes:

[0266] The first transmission component 1711 is slidably disposed on the first linkage bracket 120 and is transmissionally connected to the first backrest 130;

[0267] The first headrest 140 is disposed on the first transmission component 1711. When the first linkage bracket 120 rotates, the first transmission component 1711 slides on the first linkage bracket 120 to drive the first headrest 140 to move.

[0268] The first transmission component 1711 is mounted on the first linkage bracket 120 and can slide on the first linkage bracket 120. Specifically, the first transmission component 1711 can adopt a structure such as a slide rod, slide cylinder, slide seat, slide frame, slide rail, etc., to slide and cooperate with the first linkage bracket 120, realizing a slidable setting on the first linkage bracket 120. The first transmission component 1711 involved in this embodiment can be the same component as the first transmission component 1711 in the previous embodiment, and the specific setting can be referred to the previous embodiment. On the first linkage bracket 120, the first transmission component 1711 can be set on the upper part of the first linkage bracket 120 to correspond to the upper half of the first backrest 130 (which can also be regarded as the part of the first backrest 130 used to support the back of the human body). The first headrest 140 is mounted on the first transmission component 1711, and the first transmission component 1711 can drive the first headrest 140 to slide on the first linkage bracket 120.

[0269] The power source for the sliding of the first transmission component 1711 can be as follows:

[0270] Firstly, when the user leans against the first backrest 130, the force applied to the first backrest 130 increases when the user leans back. The force on the first backrest 130 acts simultaneously on the first transmission component 1711 and the first linkage bracket 120, causing the first linkage bracket 120 to rotate backward and simultaneously causing the first transmission component 1711 to slide on the first linkage bracket 120, thereby driving the first headrest 140 to slide relative to the first linkage bracket 120.

[0271] Secondly, a linkage structure can be configured based on the first transmission component 1711, which is connected between the first transmission component 1711 and the first base 110 or the first seat cushion 150 of the seat. When the user applies force directly to the first linkage bracket 120 or the user leans back against the first backrest 130 to rotate the first linkage bracket 120 backward, the linkage structure drives the first transmission component 1711 to move in tandem. Specifically, the first transmission component 1711 can be pulled so that it slides on the first linkage bracket 120, and the first transmission component 1711 in turn drives the first headrest 140 to slide relative to the first linkage bracket 120.

[0272] That is, when the first linkage bracket 120 rotates relative to the first base 110, the first backrest 130 slides on the first linkage bracket 120 through the first transmission component 1711, and the first transmission component 1711 supports the first backrest 130 to slide on the first linkage bracket 120; or, the first transmission component 1711 slides on the first linkage bracket 120 to drive the first backrest 130 to slide relative to the first linkage bracket 120.

[0273] In this embodiment, when a user sits in the seat and leans back against the first backrest 130, the first backrest 130 and the first linkage bracket 120 rotate relative to the first base 110. At the same time, the first transmission component 1711 slides on the first linkage bracket 120 (e.g., slides downward) to drive the first headrest 140 to move (e.g., slide downward) to adjust the position and / or angle of the first headrest 140. This allows the first headrest 140 to follow the user's body parts (such as the head and / or neck) for support, adapting to changes in the user's posture and improving the user's comfort when using the seat.

[0274] In addition, the first connecting component 171 may also include a second transmission component 1712 as described in the foregoing embodiments. The specific configuration is the same as described in the foregoing embodiments and will not be detailed here.

[0275] In some embodiments, as shown in Figures 1, 11, and 12, the seat further includes:

[0276] The first linkage frame 190 is movably connected to the first base 110, and the first seat cushion 150 is connected to the first linkage frame 190.

[0277] The first linkage frame 190 is also connected to the first linkage bracket 120 for transmission, so that when the first linkage bracket 120 rotates relative to the first base 110, it is driven to move relative to the first base 110, thereby driving the first seat cushion 150 to move.

[0278] The first linkage frame 190 and the first base 110 are movably connected. The movable connection can include rotational connection, sliding connection, or a linkage structure. Because the first linkage frame 190 and the first base 110 are movably connected, the first linkage frame 190 can move relative to the first base 110, and the movement can include moving, rotating, etc.

[0279] The first seat cushion 150 is mounted on the first linkage frame 190, which provides support for the first seat cushion 150. The first seat cushion 150 and the first linkage frame 190 are movably positioned together. That is, the first seat cushion 150 is connected to the first linkage bracket 120 via the first linkage frame 190, thus establishing a linkage relationship between the first backrest 130 and the first seat cushion 150. The first linkage frame 190 may be positioned between the first base 110 and the first seat cushion 150, with the first seat cushion 150 located above and connected to the first linkage frame 190; alternatively, the first linkage frame 190 may be positioned at the bottom of the first seat cushion 150, with the first seat cushion 150 fitted onto the first linkage frame 190; or, the first linkage frame 190 may be part of the support structure of the first seat cushion 150, with the support structure of the first seat cushion 150 and the first linkage frame 190 being integrally formed. Depending on the different functions and configurations of the first linkage frame 190, the first linkage frame 190 can also be called a seat frame, chassis frame, base frame, etc.

[0280] The first linkage frame 190 can be roughly frame-shaped, conforming to the outer contour of the first seat cushion 150. The first linkage frame 190 can be a one-piece molded frame or a frame assembled from multiple different parts or components; there is no limitation on this.

[0281] The transmission connection between the first linkage frame 190 and the first linkage bracket 120 can be either a direct connection between them to establish a transmission relationship, or a connection between the first linkage frame 190 and the first linkage bracket 120 with an intermediate connector. The first linkage frame 190 connects to the intermediate connector to establish a transmission relationship. This transmission connection can be a rotatable connection, a sliding connection, or a hinged connection. Because the first linkage bracket 120 and the first linkage frame 190 are connected, when the first linkage bracket 120 is rotated by an external force, it can drive the first linkage frame 190 to move, thus transmitting power to the first linkage frame 190 and causing it to drive the first seat cushion 150. The movement of the first seat cushion 150 can be a back-and-forth movement relative to the first base 110, allowing for position adjustment. Alternatively, during the adjustment of the position of the first seat cushion 150, the first seat cushion 150 can also rotate relative to the first base 110 to achieve the angle adjustment of the first seat cushion 150.

[0282] By setting the seat with the above structure, this application enables the first linkage bracket 120 to rotate relative to the first base 110 in the front-back direction of the seat when the first backrest 130 is subjected to external force, so as to drive the first linkage frame 190 to move forward or backward, thereby causing the first seat cushion 150 connected to the first linkage frame 190 to move forward or backward, so as to automatically adjust the position of the first seat cushion 150 to adapt to the user's sitting posture.

[0283] In some embodiments, as shown in FIG13, the first linkage frame 190 has a first connecting end 1901 and a second connecting end 1902. The first connecting end 1901 is movably connected to the first base 110, and the second connecting end 1902 is drively connected to the first linkage bracket 120.

[0284] In this embodiment, the first connecting end 1901 and the second connecting end 1902 can be the front end and the rear end of the first linkage frame 190 that are relatively spaced apart along the front-back direction of the seat or along the front-back direction of the first base 110.

[0285] Specifically, the first connecting end 1901 of the first linkage frame 190 can be movably connected to the first base 110, and the second connecting end 1902 of the first linkage frame 190 can be drivenly connected to the first linkage bracket 120, so that the first linkage frame 190 can move relative to the first base 110 in the front-back direction under the drive of the first linkage bracket 120.

[0286] Since the first linkage bracket 120 and the first base 110 are rotatably connected, by movably connecting the first connecting end 1901 of the first linkage frame 190 to the first base 110 and drivingly connecting the second connecting end 1902 of the first linkage frame 190 to the first linkage bracket 120, the first linkage bracket 120, the first base 110, and the first linkage frame 190 form a linkage mechanism with a relatively definite kinematic relationship. Therefore, due to the existence of this linkage mechanism, the first linkage frame 190 has a defined movement trajectory and a preset movement action. That is, when the first linkage bracket 120 rotates, it will drive the first linkage frame 190 to move along the defined movement trajectory and execute the preset movement action.

[0287] For example, when a user is using the chair, they sit on the first seat cushion 150. When the user reclines / lies back and the first linkage bracket 120 rotates backward (e.g., counterclockwise), the first linkage bracket 120 drives the first linkage frame 190, which in turn moves the first seat cushion 150 backward and rotates it in a first direction. This adjusts the position and angle of the first seat cushion 150 to adapt to the user's hip position when the user reclines / lies back. Conversely, when the user changes from reclining / lying back to sitting upright and the first linkage bracket 120 rotates forward (e.g., clockwise), the first linkage bracket 120 drives the first linkage frame 190, which in turn moves the first seat cushion 150 forward and rotates it in a second direction (opposite to the first direction). This adjusts the position and angle of the first seat cushion 150 to adapt to the user's hip position when the user changes from reclining / lying back to sitting upright.

[0288] The movable connection between the first connecting end 1901 of the first linkage frame 190 and the first base 110 can be achieved through a single connection point. For example, the first connecting end 1901 of the first linkage frame 190 may have a single connection structure, and the first base 110 may be connected to this single connection structure to achieve a single-point connection with the first linkage frame 190. Optionally, the single connection structure may be located at the centerline of the first linkage frame 190, i.e., the connection point may be located at the centerline of the first linkage frame 190. Alternatively, the movable connection between the first connecting end 1901 of the first linkage frame 190 and the first base 110 can also be a multi-point connection, i.e., the first connecting end 1901 of the first linkage frame 190 and the first base 110 may be connected through multiple connection points. For example, the first connecting end 1901 of the first linkage frame 190 may have multiple connection structures, and the first base 110 may be connected to each of these multiple connection structures to achieve a multi-point connection between the first linkage frame 190 and the first connecting end 1901. The number of connection structures is determined by the number of connection points. Optionally, two connection structures can be provided, symmetrically arranged about the center of the first linkage frame 190 in the transverse direction. For example, the two connection structures can be located on opposite sides of the first linkage frame 190 along its width, meaning the two connection points are located on opposite sides of the first linkage frame 190 along its width. When multiple connection points are made between the first connection end 1901 of the first linkage frame 190 and the first base 110, the connection form and connection structure of each connection point are the same, so that the movement of the first linkage frame 190 is precise and stable.

[0289] In addition, the transmission connection between the second connecting end 1902 of the first linkage frame 190 and the first linkage bracket 120 can be that the second connecting end 1902 of the first linkage frame 190 is directly connected to the first linkage bracket 120 to form a transmission relationship between the two; or, the first linkage bracket 120 can be connected to an intermediate connecting member as described in the previous embodiment, and the second connecting end 1902 of the first linkage frame 190 can be connected to the first linkage bracket 120 through the connection of the intermediate connecting member, thereby forming a transmission relationship between the two.

[0290] In some embodiments, as shown in FIG13, the first connecting end 1901 is slidably connected to the first base 110.

[0291] In this embodiment, the second connecting end 1902 of the first linkage frame 190 can be hinged to the first linkage bracket 120; optionally, the second connecting end 1902 of the first linkage frame 190 is provided with a hinge structure, and the first linkage frame 190 is hinged to the first linkage bracket 120 through the hinge structure.

[0292] Please refer to Figure 13. The second connecting end 1902 of the first linkage frame 190 is hinged to the first linkage bracket 120 through a hinged structure to achieve a transmission connection. As an example, the hinged structure of the first linkage frame 190 and the first linkage bracket 120 can be connected by a shaft, so that the second connecting end 1902 of the first linkage frame 190 and the first linkage bracket 120 form a hinge. Two hinged structures can be provided, with the two hinged structures positioned opposite each other on both sides of the first linkage frame 190 along its width direction. Both hinged structures are connected to the first linkage bracket 120 and are respectively connected by a shaft. When the first linkage bracket 120 rotates, it can correspondingly drive the second connecting end 1902 of the first linkage frame 190 to move. Since the second connecting end 1902 of the first linkage frame 190 and the first linkage bracket 120 are hinged, the second connecting end 1902 of the first linkage frame 190 can rotate relative to the first linkage bracket 120 during the movement. The movements of the first linkage frame 190 and the first linkage bracket 120 are mutually adapted, which can avoid linkage jamming.

[0293] The first connecting end 1901 of the first linkage frame 190 is slidably connected to the first base 110 of the seat, so that the first linkage frame 190 is movably disposed on the first base 110 of the seat. The first connecting end 1901 of the first linkage frame 190 and the first base 110 of the seat can be slidably connected through a sliding structure with a groove shaft engagement.

[0294] In some embodiments, as shown in FIG13, one of the first connecting end 1901 and the first base 110 is provided with a first guide groove DXC1, and the other is provided with a first slider HDJ1. The first slider HDJ1 can slide in the first guide groove DXC1, so that the first linkage frame 190 moves relative to the first base 110.

[0295] Taking a first connecting end 1901 with a first guide groove DXC1 and a first base 110 with a first sliding member HDJ1 as an example, the first guide groove DXC1 is inserted into which the first sliding member HDJ1 is slidably engaged. The first guide groove DXC1 extends along the front-rear direction of the seat, and the first sliding member HDJ1 is used to connect the first base 110 of the seat. Optionally, an intermediate connector with a first guide groove DXC1 can be provided, and the first guide groove DXC1 on the intermediate connector is slidably connected to the first sliding member HDJ1 to achieve a corresponding sliding connection between the first connecting end 1901 and the first base 110. This intermediate connector can be separately connected to the first connecting end 1901. When the first linkage frame 190 is driven by the first linkage bracket 120 to move, the movement of the first linkage frame 190 causes the first guide groove DXC1 to slide relative to the first sliding member HDJ1, while the first sliding member HDJ1 remains stationary relative to the first base 110.

[0296] When a user sits on the first seat cushion 150 and leans back or turns from leaning back to sitting upright, the first linkage bracket 120 rotates relative to the first base 110. During the rotation, the first linkage bracket 120 synchronously drives the second connecting end 1902 of the first linkage frame 190 to move. The first guide groove DXC1 on the first connecting end 1901 slides relative to the first sliding member HDJ1, causing the front end of the first linkage frame 190 to move. This allows the first linkage frame 190 to move relative to the first base 110 along the front-back direction of the seat, thereby driving the first seat cushion 150 to move and adjusting the position or angle of the first seat cushion 150 at different backrest angles.

[0297] The first guide groove DXC1 extends along the front-to-back direction of the seat, and the first slider HDJ1 is inserted into and limited to sliding within the first guide groove DXC1, so that the first connecting end 1901 of the first linkage frame 190 has a defined movement trajectory in the front-to-back direction of the seat. When the first linkage frame 190 moves, the first guide groove DXC1 on the first linkage frame 190 slides relative to the first slider HDJ1, so that the first connecting end 1901 of the first linkage frame 190 moves according to the defined movement trajectory, thereby enabling the first seat cushion 150 to perform corresponding movement actions. That is, by designing the shape of the first guide groove DXC1, a specific movement trajectory can be set for the first linkage frame 190, thereby enabling the first seat cushion 150 to have specific movement actions.

[0298] In some embodiments, as shown in FIG14, the first guide groove DXC1 includes a first groove segment CD1 and a second groove segment CD2 that are connected. The first groove segment CD1 is inclined upward toward the rear side of the seat, and the second groove segment CD2 is inclined upward toward the front side of the seat.

[0299] In this embodiment, the first guide groove DXC1 has a first groove segment CD1 and a second groove segment CD2 connected to each other. The first groove segment CD1 and the second groove segment CD2 are respectively inclined in opposite directions. Specifically, along the front-rear direction of the seat, the first groove segment CD1 is inclined forward and upward, and the second groove segment CD2 is inclined backward and upward. When the first guide groove DXC1 slides relative to the first sliding member HDJ1, the first sliding member HDJ1 can slide back and forth between the first groove segment CD1 and the second groove segment CD2. That is, the groove shape of the first guide groove DXC1 is approximately V-shaped, and the sliding trajectory of the first sliding member HDJ1 relative to the first guide groove DXC1 is an approximately V-shaped sliding trajectory.

[0300] Optionally, a smooth transition section is provided at the transition position where the first slot CD1 and the second slot CD2 meet, so that the first slider HDJ1 can smoothly transition when it moves between the two slots, avoiding the feeling of jamming caused by the rapid change of the transition section angle when the first slider HDJ1 moves between the two slots.

[0301] When the user leans back, the first linkage bracket 120 rotates backward (e.g., counterclockwise) and correspondingly pulls the second connecting end 1902 of the first linkage frame 190 to move the first linkage frame 190 as a whole backward. During this process, the position of the second connecting end 1902 of the first linkage frame 190 decreases. At the first connecting end 1901 of the first linkage frame 190 (corresponding to the front of the first seat cushion 150), the first guide groove DXC1 moves while the first slider HDJ1 remains relatively stationary. The first groove segment CD1 of the first guide groove DXC1 slides relative to the first slider HDJ1, causing the position of the first connecting end 1901 of the first linkage frame 190 to rise. The angle of the first seat cushion 150 changes and gradually tilts backward. Subsequently, the first slider HDJ1 slides from the first groove segment CD1 to the second groove segment CD2 and continues to slide relative to the first connecting end 1901 of the first linkage frame 190, causing the tilt angle of the first seat cushion 150 to gradually decrease. In other words, during the user's reclining / lying-back process, the rear of the first seat cushion 150 lowers, while the front of the first seat cushion 150 first rises and then lowers. During the lowering of the front of the first seat cushion 150, the height difference between the front and rear of the first seat cushion 150 decreases, and the first seat cushion 150 changes to a near-horizontal position. This results in a smaller backward tilt angle for the first seat cushion 150, preventing excessive backward tilting that could cause the buttocks to sag forward. When the user lies down to rest on the seat, they can achieve a flatter position, which helps improve the user's comfort when using the seat.

[0302] When the user changes from reclining to sitting upright, the first linkage bracket 120 rotates forward (e.g., clockwise) and correspondingly pushes the second connecting end 1902 of the first linkage frame 190 to move the first linkage frame 190 forward as a whole. During this process, the position of the second connecting end 1902 of the first linkage frame 190 is raised. At the first connecting end 1901 of the first linkage frame 190 (corresponding to the front of the first seat cushion 150), the first guide groove DXC1 begins to slide relative to the first slider HDJ1. The first slider HDJ1 first slides along the second groove segment CD2, causing the position of the first connecting end 1901 of the first linkage frame 190 to decrease. Then, the first slider HDJ1 slides from the first groove segment CD1 to the first groove segment CD1 and continues to slide along the first groove segment CD1, causing the position of the first connecting end 1901 of the first linkage frame 190 to increase. That is, during the process of the user changing from reclining to sitting upright, the position of the rear of the first seat cushion 150 is raised, while the position of the front of the first seat cushion 150 is lowered and then raised. During the process of the front of the first seat cushion 150 being raised, the height difference between the front and rear of the first seat cushion 150 will become smaller, and the first seat cushion 150 as a whole will change to a horizontal state.

[0303] In some embodiments, as shown in FIG13, the first linkage bracket 120 is hinged to the second connecting end 1902.

[0304] The first linkage frame 190 is hinged to the first linkage bracket 120 via a second connecting end 1902, thus forming a transmission connection with the first linkage bracket 120. When the first linkage bracket 120 rotates, it correspondingly drives the second connecting end 1902 of the first linkage frame 190 to move, thereby causing the first linkage frame 190 to move relative to the first base 110. Since the second connecting end 1902 of the first linkage frame 190 and the first linkage bracket 120 are hinged, the second connecting end 1902 of the first linkage frame 190 can rotate relative to the first linkage bracket 120 during movement. The movements of the first linkage frame 190 and the first linkage bracket 120 are mutually adaptive, which can prevent linkage jamming.

[0305] In some embodiments, as shown in FIG15, the first handrail 160 is slidably disposed on the first linkage frame 190.

[0306] The first handrail 160 can be installed on the first linkage frame 190 through a sliding structure such as a guide rail slider, guide rod, or guide sleeve, thereby achieving a sliding setting on the first linkage frame 190.

[0307] In some embodiments, as shown in FIG16, the seat further includes:

[0308] The first linkage component 1100 is connected to the first handrail 160. The first linkage component 1100 is used to drive the first handrail 160 to slide on the first linkage frame 190 when the first linkage bracket 120 rotates.

[0309] The function of the first linkage component 1100 is to transmit power to the first handrail 160 when the first linkage bracket 120 rotates, causing the first handrail 160 to slide on the first linkage frame 190. That is, in addition to being mounted on the first linkage frame 190, the first handrail 160 is also connected to the first linkage bracket 120 via the first linkage component 1100. Specifically, when the first linkage bracket 120 rotates relative to the first base 110, correspondingly driving the first linkage frame 190 to move, the first handrail 160, being mounted on the first linkage frame 190, moves accordingly. Simultaneously, the first linkage component 1100 transmits power to the first handrail 160, causing it to slide on the first linkage frame 190. That is, when the first linkage bracket 120 rotates, the first handrail 160 moves with the first linkage frame 190 and slides on the first linkage frame 190 under the transmission of the first linkage component 1100, so that the first handrail 160 has a large range of motion, improves its tracking effect on the user's arm, and can better support the user's arm.

[0310] The first linkage component 1100 mentioned in the above embodiments can have various structural forms, such as:

[0311] In some embodiments, as shown in Figures 16 to 18, the first linkage component 1100 includes:

[0312] The first linkage assembly 1110 is disposed on the first linkage frame 190 or the first seat cushion 150. One end of the first linkage assembly 1110 is hinged to the first base 110, and the other end of the first linkage assembly 1110 is hinged to the first armrest 160.

[0313] When the first linkage assembly 1110 is disposed on the first seat cushion 150, the first linkage frame 190 can be a seat cushion frame. The first seat cushion 150 is formed by covering the seat cushion shell on the first linkage frame 190. The first seat cushion 150 can move with the first linkage frame 190 and move synchronously. The first linkage assembly 1110 can be a seat cushion shell disposed on the first seat cushion 150.

[0314] The first linkage component 1100 uses the first link assembly 1110 to convert the rotational motion of the first linkage bracket 120 into the linear motion of the first handrail 160, so as to realize the transmission of power. Specifically, when the first linkage bracket 120 rotates backward, it correspondingly drives the first linkage frame 190 to move backward. At the same time, due to the change in position of the first linkage frame 190 relative to the first base 110, it correspondingly drives the first linkage assembly 1110 disposed on the first linkage frame 190 or the first seat cushion 150 to move synchronously (i.e., the linkage in the first linkage assembly 1110 moves and changes position), so as to drive the first armrest 160 to move backward on the first linkage frame 190 through the first linkage assembly 1110. When the first linkage bracket 120 rotates forward, it correspondingly drives the first linkage frame 190 to rotate forward. At the same time, due to the change in position of the first linkage frame 190 relative to the first base 110, it correspondingly drives the first linkage assembly 1110 disposed on the first linkage frame 190 or the first seat cushion 150 to move synchronously, so as to drive the first armrest 160 to move forward on the first linkage frame 190 through the first linkage assembly 1110.

[0315] In some embodiments, as shown in Figures 16 to 18, the first link assembly 1110 includes a first link 1111, a second link 1112 and a third link 1113. The second link 1112 is rotatably disposed on the first linkage frame 190 or the first seat cushion 150 and is located between the first link 1111 and the third link 1113.

[0316] One end of the first link 1111 is hinged to the first base 110, the other end of the first link 1111 is hinged to one end of the second link 1112, the other end of the second link 1112 is hinged to one end of the third link 1113, and the other end of the third link 1113 is hinged to the first handrail 160.

[0317] The first linkage assembly 1110 adopts a three-link structure consisting of a first link 1111, a second link 1112, and a third link 1113, and is located between the first base 110 and the first handrail 160. The first base 110, the first link 1111, the second link 1112, the third link 1113, and the first handrail 160 are connected in sequence.

[0318] The transmission principle of the first linkage assembly 1110 is as follows: When the first linkage bracket 120 rotates, the first linkage frame 190 moves relative to the first base 110, and the relative position between the two changes. Since the first linkage 1111 is hinged to the first base 110 and the second linkage 1112 mounted on the first linkage frame 190 or the first seat cushion 150, when the relative position between the first linkage frame 190 and the first base 110 changes, the first linkage 1111 will drive the second linkage 1112 to rotate. During the rotation, the second linkage 1112 will correspondingly drive the third linkage 1113 to move, so that the first armrest 160 can slide on the first linkage frame 190 through the third linkage 1113.

[0319] In some embodiments, the first base 110 is provided with a first mounting bracket;

[0320] The first armrest 160 is slidably disposed on the first base 110, the first seat cushion 150, or the first mounting bracket.

[0321] The seats also include:

[0322] The first linkage component 1100 is connected to the first armrest 160. The first linkage component 1100 is used to drive the first armrest 160 to slide on the first base 110, the first seat cushion 150, or the first mounting bracket when the first linkage bracket 120 rotates.

[0323] When the first armrest 160 is slidably mounted on the first base 110, the first seat cushion 150, or the first mounting bracket, the first armrest 160 can be mounted on the object (first base 110, first seat cushion 150, or first mounting bracket) through a sliding structure such as a guide rail slider or a guide rod sleeve, thereby achieving slidable mounting on the object.

[0324] The function of the first linkage component 1100 is to drive the first armrest 160 to slide on the object being mounted when the first linkage bracket 120 rotates relative to the first base 110. The first armrest 160 is mounted on the object being mounted on the first base 110, the first seat cushion 150, or the first mounting bracket, and is linked with the first linkage component 1100 and the first linkage bracket 120, with a mutually cooperating action mechanism among the three. When the first linkage bracket 120 is rotated by an external force, the first linkage component 1100 correspondingly drives the first armrest 160 to slide on the object being mounted.

[0325] Referring to the first linkage frame 190 in the aforementioned embodiment, the first mounting bracket involved in this embodiment can also be called a base bracket or a seat cushion bracket. The structure can be designed with reference to the first linkage frame 190. The only difference between the two is that the first linkage frame 190 in the aforementioned embodiment is movable on the first base 110, while the first mounting bracket in this embodiment can also be fixedly set on the first base 110.

[0326] The first linkage component 1100 mentioned in the foregoing embodiments can take various structural forms, such as:

[0327] In some embodiments, as shown in Figures 19 and 20, the first linkage component 1100 includes:

[0328] The first thread reel assembly 1120 includes a first thread reel 1121, a second thread reel 1122, and a first pull line 1123. The first thread reel 1121 is rotatably mounted on the first base 110, and the first pull line 1123 is wound around the first thread reel 1121 and the second thread reel 1122.

[0329] The first pulley 1121 is connected to the first linkage bracket 120 via a transmission, and the first handrail 160 is fixedly connected to the first pull line 1123 and can move under the drive of the first pull line 1123.

[0330] The first reel 1121 can be a winding reel, the second reel 1122 can be a support reel, and the first pull cable 1123 passes around the second reel 1122, with its two ends wound around the first reel 1121 in opposite directions. Specifically, the first reel 1121 can be provided with two separately arranged winding grooves, and the two ends of the first pull cable 1123 are wound into the two winding grooves of the first reel 1121. Based on this structural configuration, the transmission principle of the first reel 1121 assembly can be as follows: when the first linkage bracket 120 rotates, it correspondingly drives the first reel 1121 to rotate, the first reel 1121 winds or releases the first pull cable 1123, the second reel 1122 correspondingly supports the movement of the first pull cable 1123, and the first pull cable 1123 correspondingly drives the first handrail 160 to slide.

[0331] Specifically, when the first linkage bracket 120 rotates relative to the first base 1101 toward the rear of the seat, the first pulley 1121 is driven to rotate to wind one end of the first pull cable 1123 and simultaneously release the other end of the first pull cable 1123, and the movement of the first pull cable 1123 corresponds to pulling the first armrest 160 backward; when the first linkage bracket 120 rotates forward, the first pulley 1121 is driven to rotate to wind the other end of the first pull cable 1123 and simultaneously release one end of the first pull cable 1123, and the movement of the first pull cable 1123 corresponds to pulling the first armrest 160 forward.

[0332] In addition to the above-described embodiments, the first spool 1121 and the second spool 1122 may both be winding spools, with one end of the first pull wire 1123 wound around the first spool 1121 and the other end of the first pull wire 1123 wound around the second spool 1122, and the second spool 1122 is connected to a reset member (such as a reset torsion spring). Based on this structural configuration, the transmission principle of the first thread pulley 1121 assembly can be as follows: when the first linkage bracket 120 rotates, the first thread pulley 1121 is correspondingly rotated, and the first thread pulley 1121 winds or releases the first pull wire 1123. When the first thread pulley 1121 winds the first pull wire 1123, the second thread pulley 1122 rotates accordingly to release the first pull wire 1123. The reset member simultaneously accumulates elastic potential energy. When the first thread pulley 1121 releases the first pull wire 1123, the reset member acting on the second thread pulley 1122 releases elastic potential energy. Under the action of the reset member, the second thread pulley 1122 rotates accordingly to wind the first pull wire 1123.

[0333] In this case, whether the first armrest 160 is set on the first linkage frame 190, or on the first base 110, the first seat cushion 150, or the first mounting bracket, the first linkage component 1100 can be the first pulley 1121 component.

[0334] In some embodiments, as shown in Figures 16 to 18, the seat further includes:

[0335] The first sliding support component 1200 is connected to the first handrail 160 and is used to support the sliding of the first handrail 160.

[0336] A first sliding support assembly 1200 is provided on the object on which the first armrest 160 is mounted (such as the first linkage frame 190, the first base 110, the first seat cushion 150, or the first mounting bracket, etc.). The first armrest 160 is slidably mounted on the object by connecting to the first sliding support assembly 1200. That is, under the structural action of the first sliding support assembly 1200, the first armrest 160 can slide on the object.

[0337] As shown in Figure 16, the first sliding support assembly 1200 can be a sliding rod and sleeve assembly. The sliding rod and sleeve assembly includes a first sliding rod 1210 and a first sleeve 1220 that is sleeved on the first sliding rod 1210 and can slide along the first sliding rod 1210. The first sliding rod 1210 is installed on the object being set and located on the side of the object. The length direction of the first sliding rod 1210 is the same as the front-rear direction of the object being set. The first handrail 160 is connected to the first sleeve 1220. Alternatively, the first sliding support assembly 1200 can also be other sliding components such as a groove and slider assembly. For example, the object being set may have a groove structure that extends along the front-rear direction of the object, and a slider that slides within the groove structure is installed therein. The first handrail 160 is connected to the slider. These are merely examples and not limiting; any structure that can support the sliding of the first handrail 160 can be used as the first sliding support assembly 1200.

[0338] When a user sits in a chair, their back is usually resting against the chair back. In related technologies, because the backrest lines are rigid and the structural design does not meet the requirements of the curves of the back and waist, it cannot provide good support for various parts of the back and waist. Therefore, when the user's leaning angle or posture changes, some parts of the back and waist may become unsupported or lack sufficient support, which can easily lead to fatigue, soreness, and other discomfort after prolonged use.

[0339] Referring to Figures 21 to 26, which are schematic diagrams of the backrest and its components in one embodiment of this application:

[0340] This application also proposes a seat backrest, in which a person can lean against the backrest when sitting in the seat, and the backrest can provide support for the person's back and / or waist.

[0341] As shown in Figures 21 and 22, the backrest of the seat includes a backrest body 210 and a support member 220.

[0342] The backrest body 210 is provided with a plurality of openings K, which are located on the side of the backrest body 210 along its lateral direction, and each opening K extends from the edge of its side to the other side.

[0343] The backrest body 210 is also provided with two sets of support positions W. The two sets of support positions W are arranged at intervals along the horizontal or vertical direction of the backrest body 210. Each set of support positions W includes at least one support position W. The support member 220 is connected to the two sets of support positions W.

[0344] The backrest body 210, as the core support structure of the backrest, can be made of nylon, metal, or high-strength plastic, providing the necessary strength and rigidity to support the back and / or waist. A filling layer can be installed on the backrest body 210 and covered with an outer skin. The main function of the filling layer is to provide comfortable support and cushioning; materials such as sponge, foam, and memory foam can be used. The outer skin serves to protect the filling layer and provide aesthetics; it can be fabric, leather, artificial leather, etc., and the choice is not limited according to actual needs.

[0345] The backrest body 210 can be a single-body structure, meaning there is only one body. The backrest body 210 is positioned to support specific body parts, such as the back, the lumbar region, or both. Alternatively, the backrest body 210 can be a multi-body structure, with more than one body. For example, it could be a dual-body structure, specifically having an upper backrest body and a lower backrest body, arranged sequentially along the longitudinal direction of the seat. The upper backrest body provides support for the back, and the lower backrest body provides support for the lumbar region. Alternatively, the backrest body 210 could have a left backrest body and a right backrest body, arranged sequentially along the lateral direction of the seat. These are merely examples and not limiting.

[0346] The backrest body 210 has an opening K. In the lateral direction (or left-right direction) of the backrest body 210, the opening K is located on the side of the backrest body 210 and extends towards the opposite side. Optionally, the opening K is a strip-shaped opening. There can be multiple openings K, that is, two or more openings K can be provided. The specific number can be set according to actual needs, and the extension length of each opening K can be the same or different; this embodiment does not limit this. As an example, as shown in Figure 21, the left side of the backrest body 210 has at least one first opening, which extends towards the right side; and / or, the right side of the backrest body 210 has at least one second opening, which extends towards the left side. Due to the presence of the opening K, when a user leans against the backrest, the backrest body 210 can adaptively deform to conform to the user's body curve, fitting the user's body parts and providing sufficient support, adapting to different user body shapes or sitting posture changes, etc.

[0347] The backrest body 210 has two sets of support positions W, which are arranged relatively alternately in the lateral direction (which can also be regarded as the left-right direction of the seat back) or the longitudinal direction (which can also be regarded as the up-down direction of the seat back) of the backrest body 210. Each set of support positions W may include only one support position W or multiple support positions W (i.e., two or more support positions W). When a set of support positions W includes multiple support positions W, the multiple support positions W can be arranged alternately in a roughly straight line. Furthermore, the number of support positions W in the two sets of support positions W can be the same or different, depending on actual needs. As an example, as shown in Figure 21, the two sets of support positions W are the first set of support positions and the second set of support positions, respectively. In the lateral direction of the backrest body 210, the first set of support positions and the second set of support positions have the same number of support positions W, and the positions of each support position W are symmetrical about the center line of the backrest body 210.

[0348] Using the fore-and-aft direction of the seat back as a reference direction, a support member 220 is provided on the rear side of the backrest body 210. The support member 220 is connected to two sets of support positions W on the backrest body 210 to provide support for the backrest body 210. Thus, when a user leans against the seat back, the support member 220 and the backrest body 210 cooperate to provide support for the user's body. One or more support members 220 can be provided (i.e., two or more) to connect to the two sets of support positions W. Furthermore, the support member 220 can take the form of a support frame, support bracket, or similar structure; this embodiment does not limit this. The support positions W can be set in the form of support points, and the connection between the support member 220 and the support position W is a point connection. Alternatively, the support position W can also take the form of a support surface. Depending on the actual structural requirements, the connection between the support member 220 and the support position W can be fixed or movable (such as a rotating connection or a sliding connection); this embodiment does not limit this. When the support member 220 and the support position W are fixedly connected, they cannot move relative to each other; when the support member 220 and the support position W are movably connected, they can move relative to each other, and the form of movement is determined according to the connection form.

[0349] The seat backrest proposed in this application includes a backrest body 210 and a support member 220. The backrest body 210 can support the user's back and / or waist. When the user's leaning angle or posture changes, the backrest body 210 can deform to conform to the curve of the human body based on the multiple openings K provided thereon, thereby adapting to the shape of the human body. In addition, the support member 220 of the seat backrest can provide support for the backrest body 210, which can further enhance the fit between the backrest body 210 and the human back and / or waist. In summary, the seat backrest of this application can improve the user's comfort when using the seat.

[0350] In some embodiments, as shown in Figures 21 and 23, the plurality of openings K are divided into two groups, and the two groups of openings K are arranged opposite each other along the lateral direction of the backrest body 210.

[0351] Each set of openings K includes at least one opening K.

[0352] The two sets of openings K can be divided into a first set of openings and a second set of openings. In the transverse direction of the backrest body 210, the first set of openings is located on the left side of the backrest body 210, and the second set of openings is located on the right side of the backrest body 210, with the first and second openings positioned opposite each other. A set of first openings can include one or more (two or more) openings. When there are multiple first openings, they are spaced apart sequentially along the longitudinal direction of the backrest body 210. For example, as shown in Figure 21, seven first openings are spaced apart sequentially along the left side of the backrest body 210. A set of second openings can also include one or more (two or more) openings. When there are multiple second openings, they are spaced apart sequentially along the longitudinal direction of the backrest body 210. For example, as shown in Figure 21, seven second openings are spaced apart sequentially along the right side of the backrest body 210. Optionally, the number of first and second openings is the same, and their positions correspond.

[0353] In some embodiments, as shown in FIG23, the backrest body 210 includes:

[0354] Multiple support ribs 211 are spaced apart along the longitudinal direction of the backrest body 210, and the gap between any two adjacent support ribs 211 forms an opening K;

[0355] Among them, two sets of support positions W are provided on at least a portion of the support ribs 211 among the multiple support ribs 211.

[0356] The support ribs 211 are generally elongated or plate-shaped, and can be used as standalone components or integrated with other structures. Multiple support ribs 211 (two or more) are provided, spaced apart sequentially along the longitudinal direction of the backrest body 210. The number of support ribs 211 can be set according to actual needs, such as eight, and this embodiment does not impose a limitation. Furthermore, in the transverse direction of the backrest body 210, the support ribs 211 can be provided on one side, for example, multiple support ribs 211 are provided on the left or right side of the backrest body 210; or, the support ribs 211 can be provided on both sides, for example, multiple support ribs 211 are provided on both the left and right sides of the backrest body 210. Since each support rib 211 corresponds to a different position on the human body, it is designed according to ergonomic principles, with each support rib 211 having a different shape and size (such as length and width) to better fit the user's body parts and provide personalized support for users of different body types.

[0357] Since the support ribs 211 are spaced apart, the gap between any two adjacent support ribs 211 can be formed as an opening K. The size of the opening K can be determined by setting the spacing between the support ribs 211. The support ribs 211 can be connected, i.e., have a structural connection, or they can be unconnected. When the support ribs 211 are not connected, they can establish a structural connection through connection with the support member 220; this embodiment does not impose any restrictions on this.

[0358] Based on the multiple support ribs 211 included in the backrest body, the two sets of support positions W can be set on some of the support ribs 211. For example, there are eight support ribs 211, and each set of support positions W includes four support positions W. The four support positions W in each set are arranged sequentially along the longitudinal direction of the backrest body 210 and are staggered on the four support ribs 211, such as on the first, third, fifth, and seventh support ribs 211 from top to bottom along the longitudinal direction of the backrest body 210. Alternatively, the two sets of support positions W can be set on all the support ribs 211. For example, there are eight support ribs 211, and each set of support positions W includes eight support positions W. The eight support positions W in each set are arranged sequentially along the longitudinal direction of the backrest body 210 and are distributed one by one on the eight support ribs 211.

[0359] When a user leans against the backrest body 210, if the leaning posture changes, the backrest body 210 will adapt to deformation due to the spaced rib structure design adopted by the backrest body 210, and the deformation effect is good, providing the user with a better flexible support effect.

[0360] In some embodiments, as shown in FIG23, when the two sets of support positions W are spaced apart along the lateral direction of the backrest body 210, they can be symmetrical about the center line of the backrest body 210.

[0361] Each set of support positions W includes multiple support positions W, and each of the multiple support positions W is set on a support rib 211.

[0362] Using the lateral direction of the backrest body 210 as a reference direction, the two sets of support positions W are symmetrical about the center line of the backrest body 210. The symmetry involved can be basic or approximately symmetrical, and positional differences are allowed. That is, the two sets of support positions W are located on the left and right sides of the center line of the backrest body 210, respectively, and their distances from the center line of the backrest body 210 are approximately equal. Furthermore, the number of support positions W in the two sets of support positions W is the same, and their positions correspond.

[0363] Based on the multiple support ribs 211, in each group of support positions W, each support position W is disposed on a support rib 211. For example, each group of support positions W includes eight support positions W, with eight support ribs 211 provided, and the eight support positions W are correspondingly distributed on the eight support ribs 211. That is, the support positions W are evenly distributed on the multiple support ribs 211 of the backrest body 210, and the support member 220 is connected to the support positions W, so the resulting support force can be evenly distributed on the backrest body 210, thereby providing balanced support for the user's body parts.

[0364] In some embodiments, as shown in FIG23, any two adjacent support ribs 211 are connected by a connecting portion 212, and the adjacent connecting portions 212 are staggered along the longitudinal direction of the backrest body 210.

[0365] A connecting portion 212 is constructed between two adjacent support ribs 211. The connecting portion 212 can be integrally formed with the support rib 211, so that the two adjacent support ribs 211 are connected. The connected support ribs 211 form an integral backrest body 210 frame, improving the structural strength and support of the backrest body 210. Furthermore, the connection between the support ribs 211 through the connecting portion 212 allows the pressure to be distributed more evenly throughout the entire seat back area. There can be one or more connecting portions 212 between two adjacent support ribs 211. Multiple connecting portions 212 are spaced apart along the lateral direction of the backrest body 210. This embodiment does not impose any restrictions on this.

[0366] Along the longitudinal direction of the backrest body 210, the connecting portions 212 of each support rib 211 are adjacent in the vertical direction, but the adjacent connecting portions 212 are staggered. For example, taking some support ribs 211 as examples, one connecting portion 212 is provided above the support rib 211, and this connecting portion 212 can be located on the center line of the backrest body 210; two connecting portions 212 are provided below the support rib 211, and the two connecting portions 212 can be located on the left and right sides of the center line of the backrest body 210, thus making the adjacent connecting portions 212 staggered. Alternatively, taking other support ribs 211 as examples, two connecting portions 212 are provided above the support rib 211, and the two connecting portions 212 can be located on the left and right sides of the center line of the backrest body 210; one connecting portion 212 is provided below the support rib 211, and this connecting portion 212 can be located on the center line of the backrest body 210, thus making the adjacent connecting portions 212 staggered. The above are merely examples and are not restrictive. Since different users have different body shapes and sitting habits, the staggered connection positions between the support ribs 211 can better adapt to these differences and adjust the support according to different parts and postures of the human body, providing a more fitting support.

[0367] In some embodiments, as shown in Figures 22 and 23, the support member 220 includes a first support member 221. The first support member 221 has two opposing support portions 2211. One of the two support portions 2211 is connected to one set of support positions W, and the other is connected to another set of support positions W. The support member 220 adopts the structure of the first support member 221. The two opposing support portions 2211 of the first support member 221 are connected to the two sets of support positions W, thereby achieving connection support for the backrest body 210. Optionally, the two support portions 2211 are located at opposite ends of the first support member 221 and extend in a direction perpendicular to the first support member 221. The first support member 221 and the two support portions 2211 thereon combine to form an "H"-shaped component. Alternatively, the support portions 2211 can also be non-extending, such as having a square, circular, or triangular structural shape. The support part 2211 can be directly connected to the support position W of the backrest body 210, or it can be connected to the support position W of the backrest body 210 through other intermediate components.

[0368] If the two sets of support positions W are spaced apart along the lateral direction of the backrest body 210, the first support member 221 is horizontally positioned, with one support part 2211 corresponding to and connected to one set of support positions W on the left side of the backrest body 210, and the other support part 2211 corresponding to and connected to the other set of support positions W on the right side of the backrest body 210. If the two sets of support positions W are spaced apart along the longitudinal direction of the backrest body 210, the first support member 221 is vertically positioned, with one support part 2211 corresponding to and connected to one set of support positions W on the upper side of the backrest body 210, and the other support part 2211 corresponding to and connected to the other set of support positions W on the lower side of the backrest body 210.

[0369] In addition, there may be one or more first support members 221, depending on the actual needs. When there are multiple first support members 221, one support part 2211 of the multiple first support members 221 corresponds to and is connected to one of the support positions W, and another support part 2211 of the multiple first support members 221 corresponds to and is connected to another support position W.

[0370] In some embodiments, the support portion 2211 is movably connected to the support position W. The movable connection can take the form of a rotational connection, a sliding connection, an elastic connection, etc., and this embodiment is not limited to any particular type. Because the support portion 2211 is movably connected to the support position W, the backrest body 210 can be allowed to move relative to the first support member 221 to adjust according to different user body types and / or postures, adapting to the body shape and posture of the human body, and providing support and cushioning.

[0371] In some embodiments, as shown in FIG22, the support member 220 further includes at least two sets of second support members 222, and the at least two sets of second support members 222 are respectively disposed on the two support portions 2211;

[0372] Each set of second support members 222 includes at least one second support member 222. Each second support member 222 is movably connected to the support part 2211. Each support part 2211 is movably connected to a set of second support members 222 thereon and a set of support positions W corresponding to them.

[0373] Specifically, in addition to the first support member 221, the support member 220 also includes at least two sets of second support members 222 respectively disposed at the two support portions 2211 within the first support member 221. The second support members 222 are located between the support portions 2211 of the first support member 221 and the backrest body 210, and are movably connected to both the support portions 2211 of the first support member 221 and the support positions W on the backrest body 210, thereby achieving a movable connection between the support portions 2211 of the first support member 221 and the support positions W of the backrest body 210. The form of the movable connection can be referred to in the aforementioned embodiment.

[0374] The connection structure between the second support member 222 and the first support member 221 can be configured in the following two ways:

[0375] Firstly, a connecting shaft is provided on the first support member 221, and the second support member 222 is connected to the connecting shaft to form a hinged (i.e., rotatable) relationship with the first support member 221. Thus, the second support member 222 can rotate relative to the first support member 221 through the connecting shaft.

[0376] Secondly, the first support member 221 is constructed with a slide rail, through which a sliding column passes. The second support member 222 is connected to the slide rail or integrally formed, thus forming both a rotational and sliding connection with the first support member 221. Therefore, the second support member 222 can rotate or slide relative to the first support member 221 via the sliding column. In this way, when the backrest body 210 moves relative to the first support member 221, the position and / or angle of the backrest body 210 can change in various ways, allowing the backrest body 210 to better conform to the human body and provide sufficient support. The above two structural configurations are merely exemplary and not limiting, and include, but are not limited to, these examples.

[0377] Each support portion 2211 may be provided with one or more (i.e., two or more) second support members 222, and each second support member 222 may correspond to and be connected to one or more (i.e., two or more) support positions W. For example, each group of support positions W includes eight support positions W. Two first support members 221 are provided, and each support portion 2211 of each first support member 221 is provided with two second support members 222, and each second support member 222 corresponds to and is connected to two support positions W. That is, a total of sixteen support positions W in the two groups of support positions W are connected through two first support members 221 and four second support members 222. The movable connection between the second support member 222 and the support portion 2211 of the first support member 221 and the support positions W of the backrest body 210 allows for more flexible relative movement between the backrest body 210 and the first support member 221, enabling the backrest to better conform to the human body curve and provide more comfortable support.

[0378] In some embodiments, as shown in Figures 23 to 25, a third receiving cavity Q3 is provided at the support position W, and a ball joint 2221 is provided on the second support member 222. The ball joint 2221 is received in the third receiving cavity Q3 so that the second support member 222 is movably connected to the support position W. Specifically, the second support member 222 is received in the third receiving cavity Q3 at the support position W of the backrest body 210 via the ball joint 2221. The hinged engagement between the ball joint 2221 and the third receiving cavity Q3 allows the backrest body 210 to rotate and / or move relative to the second support member 222 in multiple directions, which can overcome the limitations of traditional fixed connections and enable the backrest body 210 to adapt to changes in the user's posture.

[0379] For example, the ball connector 2221 can be a rigid or elastic component, and its shape is not limited to a ball; it can be square, strip, etc. It is only necessary to enable the movable connection (rotation and / or movement) with the third accommodating cavity Q3, and there are no restrictions here.

[0380] When the user leans against the seat back, the ball joint 2221 can move within the third receiving cavity Q3. The change in the user's reclining posture causes the ball joint 2221 to move and / or rotate within the third receiving cavity Q3, thereby adjusting the angle and / or position of the backrest body 210 relative to the second support member 222. This allows the backrest body 210 to adapt to the user's body curve when reclining, improving the comfort of the support.

[0381] In some embodiments, the backrest body 210 is elastically deformable. Specifically, the backrest body 210 may be made of a material capable of elastic deformation, such as plastic. When the backrest body 210 is subjected to an external force, its main body takes on a shape and can return to its original shape or close to its original shape after the external force is removed. When a user leans against the seat back, the backrest body 210 can deform to adapt to the shape of the human body, providing support and cushioning, and reducing pressure on the body; furthermore, when the seat is subjected to an impact in an accident, the elastic deformation of the backrest body 210 can absorb some of the impact force, reducing injury to the human body.

[0382] In some embodiments, each support rib 211 has an arc surface, which is concave inward toward the human body along the lateral direction of the backrest body 210. The curvature of the arc surface on the support rib 211 can be set according to actual needs, and the curvature of the arc surface on each support rib 211 can be the same or different; this embodiment does not impose any restrictions on this. Specifically, the concave arc surface design of the support rib 211 can better conform to the natural curve of the human back and / or waist, providing good and stronger support for key parts of the body. Furthermore, it can evenly distribute pressure over a larger area, avoiding excessive local pressure, reducing pressure on specific parts of the back and / or waist, and improving comfort. In addition, it allows the seat back to better wrap around the human body, increasing the contact area between the body and the seat back, thereby improving stability.

[0383] In some embodiments, referring to FIG26, the backrest body 210 further includes a first support structure 2121. The first support structure 2121 corresponds to the structural arrangement of the backrest body 210 and is connected to the side of the backrest body 210 facing the human body. The first support structure 2121 and the backrest body 210 can be detachably connected, and the connection method can be such as snap-fit ​​connection, screw connection, etc., including but not limited to these. When the user leans against the seat back, the backrest body 210 contacts the human body through the first support structure 2121 and provides support to the human body. The first support structure 2121 can be a flexible support structure, such as flexible cotton, fabric, sponge, etc., and covers the backrest body 210. It can deform appropriately according to the body shape and weight of the human body, conform to the curve of the human body, and provide uniform and comfortable support. Furthermore, since the first support structure 2121 is located at a critical position on the surface or inside of the seat back, it can also protect other structural layers. For example, the first support structure 2121 can reduce damage to the internal rigid support structure (such as the main body of the backrest 210) from external impacts, extending the service life of the seat back. The first support structure 2121 can be covered with a fabric cover, which not only provides protection but also enhances aesthetics. A frame-shaped / ring-shaped fabric-covering pressure plate 2123 can also be configured accordingly. The fabric-covering pressure plate 2123 is located on the side of the first support structure 2121 facing away from the human body, correspondingly pressing the portion of the fabric cover that has been folded onto the back of the first support structure 2121 to assist in edging the fabric cover. The fabric-covering pressure plate 2123 can be made of elastic material, assisting in edging without affecting the elasticity of the fabric cover and / or the seat back.

[0384] In some embodiments, as shown in FIG26, the backrest body 210 further includes a second support structure 2122. The second support structure 2122 corresponds to the structural arrangement of the backrest body 210 and is connected between the first support structure 2121 and the backrest body 210. The first support structure 2121 is mounted on the backrest body 210 via the second support structure 2122. The first support structure 2121 and the second support structure 2122, and the second support structure 2122 and the backrest body 210 are sequentially and detachably connected. Specifically, the second support structure 2122 can be detachably connected to the first support structure 2121 via a fabric-covered pressure plate 2123. The detachable connection includes snap-fit ​​connections and screw connections, but is not limited to these. The second support structure 2122 can be a support plate, which is thin and capable of elastic deformation. The support plate can be a single piece or a ribbed structure as used in the backrest body 210 in the above embodiments, depending on actual needs. When the support plate is set as a rib structure, the ribs between it and the backrest body 210 are interlaced, that is, the ribs of the two are spliced ​​together, which can cover the edge of the cover fabric and prevent the edge of the cover fabric from being exposed from the opening K of the backrest body 210, thus improving the aesthetics of the appearance.

[0385] In some embodiments, as shown in FIG26, one of the backrest body 210 and the second support structure 2122 is provided with a plug hole CJK, and the other is provided with a plug portion CJB adapted to the plug hole CJK. The second support structure 2122 is inserted into the plug hole CJK through the plug portion CJB to achieve a detachable connection with the backrest body 210. The backrest body 210 and the second support structure 2122 are detachably connected through the plug-in cooperation of the plug hole CJK and the plug portion CJB, which is stable and easy to assemble and disassemble. Alternatively, the backrest body 210 may be provided with the plug hole CJK and the second support structure 2122 may be provided with the plug portion CJB; or the second support structure 2122 may be provided with the plug hole CJK and the backrest body 210 may be provided with the plug portion CJB. This embodiment does not limit this and can be configured according to actual needs. The connection structure between the insertion hole CJK and the insertion part CJB can be set in multiple sets, and these multiple sets of connection structures are spaced apart along the circumferential side of the backrest body 210, which can improve the fit between the second support structure 2122 and the backrest body 210.

[0386] This application also proposes a seat, which includes a seat body and a seat back as described above, with the seat back connected to the seat body. The specific structure of the seat back is as described in the above embodiments. Since this seat adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0387] When a user sits in a chair, their back is usually resting against the chair back. In related technologies, the chair back is fixedly connected to the seat cushion or base, and the overall structure is relatively fixed. When the user adjusts their sitting posture, the backrest and the user's back will undergo relative displacement and friction, resulting in parts of the user's back and waist being unsupported or insufficiently supported. The backrest is difficult to adapt to the user's sitting posture, resulting in poor chair comfort.

[0388] Referring to Figures 27 to 40, which are schematic diagrams of the backrest assembly and its components in one embodiment of this application:

[0389] This application also proposes a seat back assembly, the seat back assembly comprising:

[0390] Second backrest 310;

[0391] The first backrest bracket 320 is located on one side of the second backrest 310 and is used to connect the second base 350 of the seat.

[0392] The fifth transmission component 330 has one end configured to connect to the second backrest 310 and the other end configured to connect to the first backrest bracket 320.

[0393] The fifth transmission component 330 is slidably connected to the second backrest 310 or the first backrest support 320 so that when the second backrest 310 is subjected to an external force, the second backrest 310 can move relative to the first backrest support 320.

[0394] In this embodiment, the second backrest 310 in the seat generally serves as a support structure for the back and / or waist of the human body. The material used to make the second backrest 310 can be nylon, metal, or high-strength plastic, etc., which provide the necessary strength and rigidity to support the back and / or waist of the human body. Simultaneously, a filling layer can be provided on the second backrest 310, and this filling layer is covered by an outer skin. The main function of the filling layer is to provide comfortable support and cushioning; the filling layer material can be made of sponge, foam plastic, memory foam, etc. The outer skin serves to protect the filling layer and provide aesthetics; it can be fabric, leather, artificial leather, etc., and the choice is based on actual needs and is not limited thereto.

[0395] The second backrest 310 can be a single-body structure, meaning it has only one main body for supporting the back and / or waist. The second backrest 310 is configured to support specific body parts; for example, it may only support the back, only the waist, or both simultaneously. Alternatively, the second backrest 310 can be a multi-body structure, with more than one main body. For instance, it can be a dual-body structure, specifically having a first backrest body and a second backrest body, arranged sequentially along the longitudinal direction of the seat. The first backrest body provides support for the back, and the second backrest body provides support for the waist. Alternatively, the first backrest body and the second backrest body may be arranged sequentially along the transverse direction of the seat. This is merely an example and not a limitation.

[0396] The first backrest bracket 320, serving as the foundation of the backrest assembly, is located on one side of the second backrest 310 and can be connected to the second base 350 of the seat. The connection can be rotatable, allowing the first backrest bracket 320 to rotate relative to the second base 350, thus providing support for the back and / or lumbar region in conjunction with the second backrest 310. The first backrest bracket 320 is generally rod-shaped, extending along the longitudinal direction of the seat. Its shape can be various, such as arc, S-shape, L-shape, etc., depending on actual structural requirements. To ensure sufficient support strength, the first backrest bracket 320 can be made of materials such as metal (e.g., steel, aluminum alloy), plastic, etc. The first backrest bracket 320 can be a single-body structure, a double-body or multi-body structure, and can be a single-piece molding or a combination of multiple parts. This is merely an example and not a limitation.

[0397] When the second backrest 310 is subjected to an external force toward the rear of the seat (the direction of the second backrest 310 toward the first backrest support 320), since the second backrest 310 and the first backrest support 320 are connected through the fifth transmission member 330, the second backrest 310 and the first backrest support 320 can transmit force through the fifth transmission member 330. The fifth transmission member 330 can slide relative to the second backrest 310 or relative to the first backrest support 320. It can be understood that the external force on the second backrest 310 can be directly applied to the second backrest 310, or it can be applied to the first backrest support 320 or other components connected to the second backrest 310 (such as the fifth transmission member 330), indirectly causing the second backrest 310 to be subjected to external force, thereby causing the second backrest 310 to move relative to the first backrest support 320. The direction of the external force on the second backrest 310 can be towards the rear of the seat (the direction of the second backrest 310 towards the first backrest support 320), or it can be a force applied to the fifth transmission member 330 in the direction of the second base 350 of the seat, or it can be a force applied to the first backrest support 320 in the direction of the first backrest support 320 facing away from the second backrest 310. There are no restrictions on this.

[0398] The first backrest support 320 connects to the second base 350 of the seat in either a movable or fixed connection, wherein:

[0399] When the first backrest support 320 is movably connected to the second base 350, the movable connection can be a rotatable connection. When the second backrest 310 is subjected to an external force toward the rear of the seat, the second backrest 310 and the first backrest support 320 can transmit force through the fifth transmission member 330. This external force can cause the first backrest support 320 to rotate relative to the second base 350. At the same time, since the fifth transmission member 330 is slidably connected to the second backrest 310 or the first backrest support 320, the second backrest 310 and the first backrest support 320 can slide relative to each other. For example, the first backrest support 320 is rotatably connected to the second base 350 so that when the second backrest 310 is subjected to an external force toward the rear of the seat (the direction of the second backrest 310 toward the first backrest support 320) or when an external force is applied to the first backrest support 320 toward the rear of the seat, the second backrest 310 can rotate with the first backrest support 320 relative to the second base 350 toward the rear of the seat. The external force that causes the second backrest 310 to face the rear of the seat, or the external force applied to the first backrest support 320 facing the rear of the seat, can be pressure applied by the user to the second backrest 310 or the first backrest support 320 or indirectly applied to the second backrest 310, or it can be the driving force applied to the second backrest 310 or the first backrest support 320 by a drive element such as a motor or cylinder mounted on the seat. When the user reclines / lies back, pressure is applied to the second backrest 310 facing the rear of the seat, and the second backrest 310 can rotate towards the rear of the seat along with the first backrest support 320. Furthermore, since the second backrest 310 and the first backrest support 320 are slidably connected through the fifth transmission member 330, the second backrest 310 can also slide relative to the first backrest support 320. Similarly, when the second backrest 310 or the first backrest support 320 is subjected to an external force toward the front of the seat, the second backrest 310 rotates toward the front of the seat along with the first backrest support 320. Since the second backrest 310 and the first backrest support 320 are slidably connected through the fifth transmission member 330, the second backrest 310 can slide relative to the first backrest support 320.

[0400] When the first backrest bracket 320 is fixedly connected to the second base 350, the first backrest bracket 320 and the second base 350 are relatively fixed. When the second backrest 310 is subjected to external force, since the fifth transmission component 330 is slidably connected to the second backrest 310 or the first backrest bracket 320, the second backrest 310 and the first backrest bracket 320 can transmit force through the fifth transmission component 330, so that the second backrest 310 can slide relative to the first backrest bracket 320.

[0401] One end of the fifth transmission component 330 is connected to the second backrest 310, and the other end is connected to the first backrest support 320. The connection between the fifth transmission component 330 and the second backrest 310 and the first backrest support 320 may include the following forms:

[0402] Firstly, one end of the fifth transmission component 330 is slidably connected to the second backrest 310, and the other end is fixedly connected to the first backrest bracket 320. When the second backrest 310 is subjected to an external force, such as pressure applied by a user, relative sliding can occur between the second backrest 310 and the fifth transmission component 330, so that the second backrest 310 can slide relative to the first backrest bracket 320.

[0403] Secondly, one end of the fifth transmission component 330 is fixedly connected to the second backrest 310, and the other end is slidably connected to the first backrest bracket 320. When the second backrest 310 is subjected to an external force, such as pressure applied by a user to the second backrest 310, relative sliding can occur between the fifth transmission component 330 and the first backrest bracket 320, so that the second backrest 310 connected to the fifth transmission component 330 can slide relative to the first backrest bracket 320.

[0404] Third, one end of the fifth transmission member 330 is slidably connected to the second backrest 310, and the other end is rotatable with the first backrest support 320. When the second backrest 310 is subjected to an external force, such as pressure applied by the user, relative sliding can occur between the second backrest 310 and the fifth transmission member 330, so that the second backrest 310 can slide relative to the first backrest support 320. At the same time, the fifth transmission member 330 and the first backrest support 320 can rotate relative to each other, so that the second backrest 310 and the first backrest support 320 can rotate relative to each other while sliding relative to each other.

[0405] Fourth, one end of the fifth transmission member 330 is rotatably connected to the second backrest 310, and the other end is slidably connected to the first backrest bracket 320. When the second backrest 310 is subjected to an external force, such as pressure applied by a user to the second backrest 310, relative sliding can occur between the fifth transmission member 330 and the first backrest bracket 320, so that the second backrest 310 connected to the fifth transmission member 330 can slide relative to the first backrest bracket 320. At the same time, relative rotation can occur between the second backrest 310 and the fifth transmission member 330, so that the second backrest 310 and the first backrest bracket 320 can rotate relative to each other while sliding relative to each other.

[0406] The above four structural connection configurations are merely illustrative and not restrictive, and include, but are not limited to, these. In the above sliding connection forms, the sliding connection between the fifth transmission member 330 and the second backrest 310 or the first backrest bracket 320 can be a direct sliding connection or an indirect sliding connection via an intermediate component. For example, a slider and guide rail can be used for a direct sliding connection, or a connecting rod can be used as an intermediate component for an indirect sliding connection.

[0407] Optionally, under the above four sliding connection forms, when the second backrest 310 / first backrest support 320 is subjected to an external force, the second backrest 310 can move relative to the first backrest support 320. When the second backrest 310 / first backrest support 320 is subjected to an external force causing the first backrest support 320 to rotate relative to the second base 350 toward the rear of the seat, the second backrest 310 can rotate with the first backrest support 320 toward the rear of the seat. Alternatively, when the second backrest 310 or the first backrest support 320 is subjected to an external force toward the front of the seat causing the first backrest support 320 to rotate relative to the second base 350 toward the front of the seat, the second backrest 310 can rotate with the first backrest support 320 toward the front of the seat.

[0408] In summary, in the seat back assembly of this application, the second backrest 310 is connected to the first backrest support 320 via a fifth transmission member 330. The fifth transmission member 330 is slidably connected to the second backrest 310 or to the first backrest support 320, so that when the second backrest 310 is subjected to an external force, the second backrest 310 can move relative to the fifth transmission member 330 and / or relative to the first backrest support 320 through the sliding connection between the fifth transmission member 330 and the second backrest 310 or to the first backrest support 320. Furthermore, when the second backrest 310 is subjected to an external force toward the rear of the seat, causing the first backrest support... When the first backrest support 320 rotates relative to the second base 350 toward the rear of the seat, the second backrest 310 can rotate with the first backrest support 320 relative to the second base 350 toward the rear of the seat, and simultaneously, the second backrest 310 can move relative to the first backrest support 320. Similarly, when the second backrest 310 or the first backrest support 320 is subjected to an external force toward the front of the seat, causing the first backrest support 320 to rotate relative to the second base 350 toward the front of the seat, the second backrest 310 can rotate with the first backrest support 320 relative to the second base 350 toward the front of the seat, and simultaneously, the second backrest 310 can move relative to the first backrest support 320. Through the above configuration, when a user uses the seat and applies force to the second backrest 310 to adjust their sitting posture, the second backrest 310 can adaptively move with the user's posture adjustment to better conform to the user's back and / or waist, providing better support, reducing pressure on the user's back and / or waist, and improving the comfort of the seat.

[0409] Referring to Figures 27 to 31, in some embodiments, the fifth transmission component 330 proposed in this application includes:

[0410] The third connecting end 331 is slidably connected to the first backrest bracket 320;

[0411] The fourth connecting end 332 is connected to the second backrest 310 via a transmission connection.

[0412] In this embodiment, as one of the connection methods between the second backrest 310 and the first backrest support 320 via the fifth transmission member 330, the third connecting end 331 of the fifth transmission member 330 is slidably connected to the first backrest support 320, and the fourth connecting end 332 of the fifth transmission member 330 is drive-connected to the second backrest 310. The drive connection can be a sliding connection, a rotating connection, or a sliding and rotating connection. The drive connection between the fourth connecting end 332 and the second backrest 310 can be a direct connection or an indirect connection through an intermediate component. When the user leans back, the second backrest 310 and / or the first backrest support 320 are subjected to external force, and the second backrest 310 can move relative to the first backrest support 320. At this time, the relative motion states of the second backrest 310 and the first backrest support 320 can be as follows:

[0413] Firstly, the third connecting end 331 can slide relative to the first backrest bracket 320; the fourth connecting end 332 can rotate relative to the second backrest 310.

[0414] When the second backrest 310 and / or the first backrest support 320 are subjected to external force, the fifth transmission component 330 can slide relative to the first backrest support 320 because the third connecting end 331 is slidably connected to the first backrest support 320. That is, the second backrest 310 slides relative to the first backrest support 320. At the same time, the fourth connecting end 332 of the fifth transmission component 330 is rotatably connected to the second backrest 310, so the second backrest 310 can also rotate relative to the fifth transmission component 330. That is, the second backrest 310 can rotate relative to the first backrest support 320. Therefore, the second backrest 310 can slide and rotate relative to the first backrest support 320.

[0415] Secondly, the third connecting end 331 can slide relative to the first backrest bracket 320; the fourth connecting end 332 can slide relative to the second backrest 310.

[0416] When the second backrest 310 and / or the first backrest support 320 are subjected to external force, the fifth transmission member 330 can slide relative to the first backrest support 320 because the third connecting end 331 is slidably connected to the first backrest support 320. That is, the second backrest 310 slides relative to the first backrest support 320. At the same time, because the fourth connecting end 332 of the fifth transmission member 330 is slidably connected to the second backrest 310, the second backrest 310 can also slide relative to the fifth transmission member 330. That is, the second backrest 310 can slide relative to the first backrest support 320.

[0417] Third, the third connecting end 331 can slide relative to the first backrest bracket 320; the fourth connecting end 332 can slide and rotate relative to the second backrest 310.

[0418] When the second backrest 310 and / or the first backrest support 320 are subjected to external force, the fifth transmission member 330 can slide relative to the first backrest support 320 because the third connecting end 331 is slidably connected to the first backrest support 320. That is, the second backrest 310 slides relative to the first backrest support 320. At the same time, the fourth connecting end 332 of the fifth transmission member 330 is slidably and rotatably connected to the second backrest 310. For example, the two are connected by a sliding shaft and a sliding groove. The sliding shaft can slide and rotate relative to the sliding groove, so that the second backrest 310 can not only slide relative to the fifth transmission member 330, but also rotate relative to the fifth transmission member 330. That is, the second backrest 310 can slide and rotate relative to the first backrest support 320.

[0419] The three connection methods described above are merely illustrative and not restrictive, and include, but are not limited to, these methods. Through the aforementioned sliding connection, when the second backrest 310 / first backrest support 320 is subjected to an external force, the second backrest 310 can move relative to the first backrest support 320. When the second backrest 310 / first backrest support 320 is subjected to an external force causing the first backrest support 320 to rotate relative to the second base 350 toward the rear of the seat, the second backrest 310 can rotate with the first backrest support 320 toward the rear of the seat. Alternatively, when the second backrest 310 / first backrest support 320 is subjected to an external force causing the first backrest support 320 to rotate relative to the second base 350 toward the front of the seat, the second backrest 310 can rotate with the first backrest support 320 toward the front of the seat. The second backrest 310 can move relative to the first backrest support 320 through the above three connection methods to adapt to the user's sitting posture, thereby better conforming to the user's back and / or waist, providing better support, reducing pressure on the user's back and / or waist, and improving the comfort of the seat.

[0420] Further referring to Figures 30 to 33, the third connecting end 331 proposed in the embodiments of this application includes a second sliding structure 3311, and the first backrest bracket 320 is provided with a third sliding structure 3201 adapted to the second sliding structure 3311. The third connecting end 331 is slidably connected to the first backrest bracket 320 through the cooperation of the second sliding structure 3311 and the third sliding structure 3201.

[0421] In this embodiment, as one of the sliding connection forms between the third connecting end 331 and the first backrest support 320, a second sliding structure 3311 is provided on the third connecting end 331, and a third sliding structure 3201 adapted to the second sliding structure 3311 is provided on the first backrest support 320. That is, the fifth transmission member 330 slides with the third sliding structure 3201 on the first backrest support 320 through the second sliding structure 3311 thereon. The second sliding structure 3311 and the third sliding structure 3201 may include, but are not limited to, the following configuration forms:

[0422] Firstly, the slider-groove structure: the slider can be embedded in the groove and slide within it. This design is simple and stable, suitable for applications requiring relatively small forces or relative sliding.

[0423] Secondly, the guide rail slider structure: the slider slides on the guide rail. The guide rail and slider structure is similar to the slide rail slider, but the guide rail is usually more precise and suitable for more accurate position control.

[0424] Thirdly, the rolling slide structure: one of the two sliding components is a smooth rod, and the other is a kit that slides with the smooth rod using a ball or roller. The kit can slide relative to the smooth rod, which can reduce friction, improve sliding smoothness and load-bearing capacity, and is suitable for use in situations where smooth and easy sliding is required.

[0425] Fourth, cam groove structure: For example, a cam shape is designed on the second sliding structure 3311, and a groove matching the cam is opened on the third sliding structure 3201. The cam slides relative to the groove so that the third connecting end 331 slides relative to the first backrest bracket 320.

[0426] As an example, one of the second sliding structure 3311 and the third sliding structure 3201 is sleeved on the other. For instance, the second sliding structure 3311 serves as a shaft assembly, and the third sliding structure 3201 serves as a slider. The shaft assembly is sleeved on the slider, and the shaft assembly can slide along the slider or the slider can slide within the shaft assembly, allowing the second sliding structure 3311 and the third sliding structure 3201 to slide relative to each other, thus enabling the second backrest 310 and the first backrest support 320 to slide relative to each other. Optionally, the shaft assembly can be a ball bearing or a linear bearing, and the slider can be a smooth shaft that mates with a ball bearing or a linear bearing. The structure of the slider extends along the longitudinal direction of the seat.

[0427] In some embodiments, as an example, the third sliding structure 3201 includes a cavity constructed in the first backrest support 320, and the second sliding structure 3311 includes a sliding body that cooperates with the cavity, the sliding body being slidable relative to the cavity.

[0428] As one possible arrangement for the second sliding structure 3311 and the third sliding structure 3201 to be connected, the third sliding structure 3201 can be constructed by creating a cavity in the first backrest support 320, and the second sliding structure 3311 can be constructed with a sliding body that can slide within the cavity. The cavity can extend along the longitudinal direction of the seat.

[0429] The cavity can be an inner cavity formed by hollowing out the first backrest support 320. The sliding body can be a boss, protrusion, tubular or other structure formed on or installed on the second sliding structure 3311 that can cooperate with the inner cavity. When the second backrest 310 or the first backrest support 320 is rotated relative to the second base 350 under force, the second sliding structure 3311 can slide in the cavity of the third sliding structure 3201 on the first backrest support 320 through the sliding body on it, so that the fifth transmission member 330 can slide relative to the first backrest support 320. That is, the second backrest 310 connected to the fifth transmission member 330 can slide relative to the first backrest support 320. This sliding can make the second backrest 310 adaptively adjust the angle and / or position of the second backrest 310 according to the user's posture when using the seat.

[0430] Optionally, when the second backrest 310 / first backrest support 320 is subjected to an external force causing the first backrest support 320 to rotate relative to the second base 350 towards the rear of the seat, the second backrest 310 can rotate with the first backrest support 320 towards the rear of the seat; or when the second backrest 310 / first backrest support 320 is subjected to an external force causing the first backrest support 320 to rotate relative to the second base 350 towards the front of the seat, the second backrest 310 can rotate with the first backrest support 320 towards the front of the seat. During this process, the second sliding structure 3311 can... The fifth transmission component 330 slides within the cavity of the third sliding structure 3201 of the first backrest support 320 via its sliding body, allowing the fifth transmission component 330 to slide relative to the first backrest support 320. In other words, the second backrest 310 connected to the fifth transmission component 330 can slide relative to the first backrest support 320. The second backrest 310 can also move relative to the first backrest support 320 via the fifth transmission component 330 to adapt to the user's sitting posture, thereby better conforming to the user's back and / or waist and reducing the friction between the user's back and the backrest.

[0431] Referring to Figures 30 to 33, in some embodiments, one of the second sliding structure 3311 and the third sliding structure 3201 proposed in this application is provided with a first sliding groove HC1 for sliding cooperation between the two, and the second sliding structure 3311 slides in cooperation with the third sliding structure 3201 through the first sliding groove HC1.

[0432] Optionally, taking the second sliding structure 3311 sleeved on the third sliding structure 3201 as an example, the second sliding structure 3311 is a shaft sleeve, and the third sliding structure 3201 is a smooth rod that can extend into the shaft sleeve and is slidably connected to the shaft sleeve. One of the shaft sleeve and the smooth rod is provided with a first groove HC1, and the other is provided with a sliding structure adapted to the structure of the first groove HC1. For example, the first groove HC1 is recessed in the outer wall of the smooth rod, the inner wall of the shaft sleeve is sleeved on the outer wall of the smooth rod, and the inner wall of the shaft sleeve is provided with a protrusion corresponding to the first groove HC1 recessed in the outer wall of the smooth rod.

[0433] Similarly, the third sliding structure 3201 includes a cavity constructed in the first backrest support 320, and the second sliding structure 3311 includes a sliding body that cooperates with the cavity. In the scheme where the sliding body can slide relative to the cavity, the inner wall of the cavity is slidably connected to the outer wall of the sliding body, and the first sliding groove HC1 can be constructed on the inner wall of the cavity or on the outer wall of the sliding body.

[0434] Furthermore, based on the above embodiments, at least one first pulley HL1 can be provided in one of the second sliding structure 3311 and the third sliding structure 3201 for sliding engagement with the other of the two.

[0435] Understandably, the purpose of setting up the first pulley HL1 is to make the sliding between the second sliding structure 3311 and the third sliding structure 3201 smoother and more stable. Specifically, the first pulley HL1 can significantly reduce the frictional resistance between the two. The use of the first pulley HL1 reduces the frictional resistance between the sliding parts, making the sliding between the second sliding structure 3311 and the third sliding structure 3201 smoother and more fluid, reducing jamming and obstruction. Furthermore, the first pulley HL1 can reduce the direct friction between the second sliding structure 3311 and the third sliding structure 3201 during the sliding process, reducing the wear on the surface of the parts and thus extending the service life of the sliding structure. Since direct friction is avoided, noise can also be reduced to a certain extent, which helps to achieve a quieter sliding effect, making it suitable for applications where quietness is required, such as office and study environments.

[0436] In some embodiments, as another way in which the fifth transmission member 330 is connected to the first backrest bracket 320 and the second backrest 310, the fifth transmission member 330 includes:

[0437] The third connecting end 331 is connected to the first backrest bracket 320;

[0438] The fourth connecting end 332 is slidably connected to the second backrest 310.

[0439] In this embodiment, the third connecting end 331 of the fifth transmission component 330 is connected to the first backrest bracket 320. The connection form can be a fixed connection, a rotating connection, a sliding connection, and a rotating connection. For example, the third connecting end 331 is fixedly connected to the first backrest bracket 320.

[0440] The connection relationships between the fifth transmission component 330 and the second backrest 310 and the first backrest bracket 320 include, but are not limited to, the following:

[0441] Firstly, the third connecting end 331 is fixedly connected to the first backrest bracket 320, and the fourth connecting end 332 is slidably connected to the second backrest 310.

[0442] When the second backrest 310 is subjected to an external force, since the fourth connecting end 332 is slidably connected to the second backrest 310, the second backrest 310 can slide relative to the fifth transmission member 330. The fifth transmission member 330 is fixed relative to the first backrest bracket 320, that is, the second backrest 310 can slide relative to the first backrest bracket 320.

[0443] Secondly, the third connecting end 331 is rotatably connected to the first backrest bracket 320, and the fourth connecting end 332 is slidably connected to the second backrest 310.

[0444] When the second backrest 310 is subjected to an external force, since the third connecting end 331 is rotatably connected to the first backrest support 320, the fifth transmission component 330 can rotate relative to the first backrest support 320, that is, the second backrest 310 rotates relative to the first backrest support 320. At the same time, since the fourth connecting end 332 of the fifth transmission component 330 is slidably connected to the second backrest 310, the second backrest 310 can also slide relative to the fifth transmission component 330, that is, the second backrest 310 can slide relative to the first backrest support 320. Therefore, the second backrest 310 can slide and rotate relative to the first backrest support 320.

[0445] Thirdly, the third connecting end 331 is slidably and rotatably connected to the first backrest bracket 320, and the fourth connecting end 332 is slidably connected to the second backrest 310.

[0446] When the second backrest 310 is subjected to an external force, the fifth transmission component 330 can slide relative to the second backrest 310 because the fourth connecting end 332 is slidably connected to the second backrest 310. At the same time, the third connecting end 331 is slidably and rotatably connected to the first backrest bracket 320. For example, the two are connected by a sliding shaft and a sliding groove. The sliding shaft can slide and rotate relative to the sliding groove, so that the first backrest bracket 320 slides and rotates relative to the fifth transmission component 330. That is, the second backrest 310 can slide and rotate relative to the first backrest bracket 320.

[0447] Optionally, when the second backrest 310 / first backrest support 320 is subjected to an external force causing the first backrest support 320 to rotate relative to the second base 350 toward the rear of the seat, the second backrest 310 can rotate with the first backrest support 320 toward the rear of the seat. Alternatively, when the second backrest 310 / first backrest support 320 is subjected to an external force causing the first backrest support 320 to rotate relative to the second base 350 toward the front of the seat, the second backrest 310 can rotate with the first backrest support 320 toward the front of the seat. During this process, the second backrest 310 can move relative to the first backrest support 320 through the above connection method to adapt to the user's sitting posture, thereby better conforming to the user's back and / or waist, reducing the friction between the user's back and the backrest, and improving the comfort of the seat.

[0448] Furthermore, the fourth connecting end 332 is provided with a fourth sliding structure, and the second backrest 310 is provided with a fifth sliding structure adapted to the fourth sliding structure. The fourth connecting end 332 is slidably connected to the second backrest 310 through the cooperation of the fourth sliding structure and the fifth sliding structure.

[0449] As one of the sliding connection forms between the second backrest 310 and the fifth transmission component 330, the arrangement of the fourth sliding structure and the fifth sliding structure can refer to the arrangement of the second sliding structure 3311 and the third sliding structure 3201 described in the foregoing embodiments, and will not be repeated here.

[0450] For example, a cavity as described in the foregoing embodiment is provided on the second backrest 310 as the fifth sliding structure, or a slide rail structure equivalent to the cavity, and a sliding body as described in the foregoing embodiment is provided on the fourth connecting end 332 as the fourth sliding structure. The fourth connecting end 332 cooperates with the cavity on the second backrest 310 through the sliding body thereon to slide with the second backrest 310.

[0451] For example, a ramp slide rail can be provided in the fourth sliding structure, and a slide groove can be provided on the side of the ramp slide rail facing the second backrest 310. The fifth sliding structure is provided with a sliding member that is slidably connected to the slide groove and can slide relative to the slide groove. The sliding trajectory of the slide groove can be a trajectory design that allows the second backrest 310 to slide relative to the first backrest support 320 in the direction toward the base of the seat when the user applies pressure to the second backrest 310.

[0452] When the user applies pressure to the second backrest 310, the fourth sliding structure and the fifth sliding structure slide relative to each other, so that the second backrest 310 slides relative to the fifth transmission member 330, that is, the second backrest 310 slides relative to the first backrest support 320. This sliding allows the second backrest 310 to adaptively adjust its angle and / or position according to the curve and / or position of the user's back and / or waist.

[0453] Optionally, when the second backrest 310 / first backrest support 320 is subjected to an external force causing the first backrest support 320 to rotate relative to the second base 350 toward the rear of the seat, the second backrest 310 can rotate with the first backrest support 320 toward the rear of the seat. Alternatively, when the second backrest 310 / first backrest support 320 is subjected to an external force causing the first backrest support 320 to rotate relative to the second base 350 toward the front of the seat, the second backrest 310 can rotate with the first backrest support 320 toward the front of the seat. During this process, the fourth sliding structure provided on the fourth connecting end 332 slides relative to the fifth sliding structure on the second backrest 310, so that the second backrest 310 can slide relative to the fifth transmission component 330, that is, the second backrest 310 can slide relative to the first backrest support 320, so as to make adaptive movements according to the user's sitting posture adjustment, thereby better conforming to the user's back and / or waist, and reducing the friction between the user's back and the backrest.

[0454] Referring to Figures 30 and 34 to 38, in some embodiments, the backrest assembly proposed in this application further includes a sixth transmission member 340, disposed between the fifth transmission member 330 and the second backrest 310. The sixth transmission member 340 includes:

[0455] The fifth connecting end 3401 is connected to the second backrest 310 via a transmission connection;

[0456] The sixth connecting end 3402 is hinged to the fourth connecting end 332.

[0457] In this embodiment, the fifth transmission member 330 and the second backrest 310 can be connected via a sixth transmission member 340. The fourth connecting end 332 of the fifth transmission member 330 connecting the second backrest 310 and the sixth connecting end 3402 of the sixth transmission member 340 are hinged, meaning that the fourth connecting end 332 and the sixth connecting end 3402 can rotate relative to each other. The fifth connecting end 3401 is connected to the second backrest 310, so that the second backrest 310 is connected to the fifth transmission member 330. The forms in which the sixth transmission member 340 connects to the second backrest 310 and to the fifth transmission member 330 include, but are not limited to, the following:

[0458] Firstly, the fifth connecting end 3401 of the sixth transmission component 340 is rotatably connected to the second backrest 310, and the sixth connecting end 3402 is hinged to the fourth connecting end 332 of the fifth transmission component 330.

[0459] When the second backrest 310 is subjected to an external force, such as when a user leans against the second backrest 310 and reclines / lies back, the second backrest 310 and the fifth connecting end 3401 of the sixth transmission member 340 can rotate relative to each other. Furthermore, since the sixth connecting end 3402 of the sixth transmission member 340 is hinged to the fourth connecting end 332 of the fifth transmission member 330, the sixth transmission member 340 can rotate relative to the first backrest support 320, that is, the second backrest 310 and the first backrest support 320 can rotate relative to each other.

[0460] Secondly, the fifth connecting end 3401 of the sixth transmission component 340 is slidably connected to the second backrest 310, and the sixth connecting end 3402 is hinged to the fourth connecting end 332 of the fifth transmission component 330.

[0461] When the second backrest 310 is subjected to an external force, such as when a user leans against the second backrest 310 and reclines / lies back, the second backrest 310 and the fifth connecting end 3401 of the sixth transmission member 340 can slide relative to each other. Furthermore, since the sixth connecting end 3402 of the sixth transmission member 340 is hinged to the fourth connecting end 332 of the fifth transmission member 330, the sixth transmission member 340 can rotate relative to the first backrest support 320. That is, the second backrest 310 and the first backrest support 320 can rotate relative to each other. Therefore, the second backrest 310 and the first backrest support 320 can rotate and slide.

[0462] Thirdly, the fifth connecting end 3401 of the sixth transmission component 340 is slidably and rotatably connected to the second backrest 310, and the sixth connecting end 3402 is rotatably connected to the fourth connecting end 332 of the fifth transmission component 330.

[0463] When the second backrest 310 is subjected to an external force, such as when a user leans against the second backrest 310 and reclines / lies back, the second backrest 310 and the fifth connecting end 3401 of the sixth transmission member 340 can slide and rotate relative to each other. For example, the second backrest 310 and the fifth connecting end 3401 achieve sliding and rotation through the cooperation of a sliding shaft and a sliding groove. Furthermore, since the sixth connecting end 3402 of the sixth transmission member 340 is rotatably connected to the fourth connecting end 332 of the fifth transmission member 330, the sixth transmission member 340 can rotate relative to the fifth transmission member 330, that is, the second backrest 310 and the first backrest support 320 can rotate relative to each other. Therefore, the second backrest 310 and the first backrest support 320 can rotate and slide.

[0464] Referring to Figures 36 to 40, by way of example, the sixth transmission member 340 includes a fifth connector 341, and a fifth connection end 3401 is disposed at one end of the fifth connector 341 facing the second backrest 310. The fifth transmission member 330 is connected to the second backrest 310 through the fifth connector 341.

[0465] The fifth connecting end 3401 can be a structure constructed on the end of the fifth connecting member 341 facing the second backrest 310, or it can be a structure disposed on an intermediate member separately from the fifth connecting member 341.

[0466] Furthermore, the sixth transmission component 340 also includes a sixth connector 342, one end of which is movably connected to the fifth connector 341, and the other end is movably connected to the second backrest 310.

[0467] The connection form of the sixth connector 342 to the fifth connector 341 includes sliding, rotating, sliding and rotating connection, and elastic connection. The connection form of the sixth connector 342 to the second backrest 310 may also include sliding, rotating, and elastic connection.

[0468] Optionally, when the second backrest 310 / first backrest support 320 is subjected to an external force causing the first backrest support 320 to rotate relative to the second base 350 towards the rear of the seat, the second backrest 310 can rotate with the first backrest support 320 towards the rear of the seat; or when the second backrest 310 / first backrest support 320 is subjected to an external force causing the first backrest support 320 to rotate relative to the second base 350 towards the front of the seat, the second backrest 310 can rotate with the first backrest support 320 towards the front of the seat. During this process, The second backrest 310 can be movably connected (sliding, rotating, sliding and rotating, deforming, displacing) to the fifth connector 341 and the sixth connector 342 of the sixth transmission member 340, so that the second backrest 310 can move relative to the sixth transmission member 340. It can also be moved relative to the second backrest 310 through the fifth transmission member 330, so that the second backrest 310 can make adaptive movements according to the user's sitting posture, thereby better conforming to the user's back and / or waist, reducing the friction between the user's back and the backrest, and improving the comfort of the seat.

[0469] As an example, referring to Figures 34 to 37, in some embodiments, one of the sixth connector 342 and the second backrest 310 proposed in this application is provided with a seventh connector 343, and the other is provided with a first receiving groove RZC1 adapted to the seventh connector 343. The sixth connector 342 is movably connected to the second backrest 310 through the cooperation of the seventh connector 343 and the first receiving groove RZC1. The movable connection can be a rotational connection, a sliding connection, a rotational and sliding connection, or an elastic connection.

[0470] As an example, the seventh connector 343 can be a spherical or near-spherical connector or an elastic connector. The first receiving groove RZC1 is designed as a generally concave structure, which can accommodate the seventh connector 343 and provide a relatively constrained movement trajectory for the seventh connector 343. The shape of the seventh connector 343 generally matches the concave structure to achieve a movable connection between the seventh connector 343 and the first receiving groove RZC1.

[0471] When the seventh connector 343 is a spherical or near-spherical connector, it can rotate freely within the first receiving groove RZC1, providing multi-directional movement capability. When the seventh connector 343 is an elastic connector, such as elastic silicone, it cooperates with the first receiving groove RZC1 to achieve rotation. It should be noted that when using an elastic connector (such as elastic silicone), because the elastic connector has a certain degree of elasticity, it allows the second backrest 310 and / or the first backrest support 320 to achieve a certain degree of rotation with the fifth transmission component 330 while also achieving a small range of movement, thereby achieving adaptive adjustment of the second backrest 310 to provide a better fit.

[0472] Referring to Figure 27, this application further proposes a seat, including a second base 350 and a backrest assembly as described in the foregoing embodiments. A first backrest bracket 320 of the backrest assembly is connected to the second base 350. The connection between the two can be a fixed connection or a rotatable connection. The rotatable connection structure between the first backrest bracket 320 and the second base 350 can be configured such that the first backrest bracket 320 passes through the second base 350 via a hinge shaft to achieve a rotatable connection with the second base 350. Further, the first backrest bracket 320 can be fixedly connected to a rotating frame, which is sleeved on the hinge shaft to form a rotatable connection with the second base 350. This is merely exemplary and not restrictive.

[0473] When the second backrest 310 is subjected to an external force toward the rear of the seat, the external force is transmitted through the fifth transmission member 330, causing the first backrest bracket 320 connected to the fifth transmission member 330 to rotate relative to the second base 350. The second backrest 310 can rotate with the first backrest bracket 320 relative to the second base 350, and at the same time, the second backrest 310 can move relative to the first backrest bracket 320. The external force that causes the second backrest 310 to move toward the rear of the seat or the external force applied to the first backrest bracket 320 toward the rear of the seat can be the pressure applied by the user to the second backrest 310 or the first backrest bracket 320, or it can be the driving force applied to the second backrest 310 or the first backrest bracket 320 by a drive element such as a motor or cylinder mounted on the seat.

[0474] When the first backrest bracket 320 is fixedly connected to the second base 350, the first backrest bracket 320 and the second base 350 are relatively fixed. When the second backrest 310 is subjected to external force, it is slidably connected to the second backrest 310 or the first backrest bracket 320 through the fifth transmission component 330, so that the second backrest 310 can move relative to the first backrest bracket 320.

[0475] When a user sits in a chair, their back is usually resting against the backrest. In related technologies, because the backrest is fixed relative to the seat cushion, when the user adjusts their posture, the backrest cannot adapt accordingly, resulting in parts of the user's back and waist being unsupported or lacking adequate support, leading to poor comfort when using the chair.

[0476] Referring to Figures 41 to 50, which are structural schematic diagrams of the seat back assembly and its components in one embodiment of this application:

[0477] This application also proposes a seat back assembly, the seat back assembly comprising:

[0478] Third backrest 410;

[0479] The second linkage bracket 420 is located on one side of the third backrest 410 and is rotatably connected to the third base 480 of the seat.

[0480] The first support member 430 has one end movably connected to the third backrest 410 and the other end rotatably connected to the second linkage bracket 420.

[0481] The second support member 440 has one end rotatably connected to the first support member 430 or rotatably connected to the third backrest 410, and the other end of the second support member 440 is connected to the third base 480.

[0482] In this embodiment, the third backrest 410 serves as a support structure in the seat to support the user's back and / or waist. The third backrest 410 can be made of materials such as nylon, metal, or high-strength plastic, providing the necessary strength and rigidity to support the user's back and / or waist. A padding layer can be provided on the third backrest 410, which is then covered by an outer skin. The main function of the padding layer is to provide comfortable support and cushioning; materials such as sponge, foam, and memory foam can be used. The outer skin serves to protect the padding layer and provide aesthetic appeal; it can be fabric, leather, artificial leather, etc., and the choice is not limited according to actual needs.

[0483] The third backrest 410 can be a single-body structure, meaning it has only one main body. The third backrest 410 is positioned to support specific body parts, providing support only for the back, only for the lumbar region, or simultaneously for both. Alternatively, the third backrest 410 can be a multi-body structure, with more than one main body. For example, it could be a dual-body structure, specifically having an upper backrest body and a lower backrest body, arranged sequentially along the longitudinal direction of the seat. The upper backrest body provides support for the back, and the lower backrest body provides support for the lumbar region. Alternatively, the third backrest 410 could have a left backrest body and a right backrest body, arranged sequentially along the lateral direction of the seat. These are merely examples and not limiting.

[0484] The second linkage bracket 420, serving as the foundation of the backrest assembly, is located on one side of the third backrest 410 and rotatably connected to the third base 480 of the seat. This allows the second linkage bracket 420 to rotate relative to the third base 480, cooperating with the third backrest 410 to provide support for the back and / or lumbar region. The second linkage bracket 420 is generally rod-shaped, extending along the longitudinal direction of the seat. Its shape can be various, such as arc, S-shape, L-shape, etc., depending on actual structural requirements. To ensure sufficient support strength, the second linkage bracket 420 can be made of materials such as metal (e.g., steel, aluminum alloy), or plastic. The second linkage bracket 420 can be a single-body structure, a double-body or multi-body structure, and can be a single-body integral molding or a multi-body splicing assembly. The rotatable connection structure between the second linkage bracket 420 and the third base 480 can be configured such that the second linkage bracket 420 passes through the third base 480 via a hinge shaft, achieving a rotatable connection with the third base 480. Furthermore, the second linkage bracket 420 may be fixedly connected to a rotating frame, which is sleeved on the hinge shaft to form a rotatable connection with the third base 480. This is merely exemplary and not restrictive.

[0485] When the third backrest 410 is subjected to an external force toward the rear of the seat (the direction of the third backrest 410 toward the second linkage bracket 420), or when an external force is applied to the second linkage bracket 420 toward the rear of the seat, since the third backrest 410 and the second linkage bracket 420 are connected through the first support member 430, the force can be transmitted between the third backrest 410 and the second linkage bracket 420. The second linkage bracket 420, under force, can rotate relative to the third base 480 toward the rear of the seat, simultaneously causing the third backrest 410 to rotate toward the rear of the seat. The external force causing the third backrest 410 to move toward the rear of the seat, or the external force applied to the second linkage bracket 420 toward the rear of the seat, can be pressure applied by the user to the third backrest 410 or the second linkage bracket 420, or driving force applied to the third backrest 410 or the second linkage bracket 420 by drive components such as motors or cylinders mounted on the seat. When the user leans back, pressure is applied to the third backrest 410 toward the rear of the seat. The third backrest 410 can rotate toward the rear of the seat along with the second linkage bracket 420. Since the third backrest 410 and the second linkage bracket 420 are connected through the first support member 430, one end of the first support member 430 is movably connected to the third backrest 410, and the other end is rotatably connected to the second linkage bracket 420. When the third backrest 410 or the second linkage bracket 420 is subjected to an external force toward the rear of the seat, the third backrest 410 can move relative to the second linkage bracket 420.

[0486] One end of the first support member 430 is movably connected to the third backrest 410. The movable connection includes, but is not limited to, a rotational connection, a sliding connection (such as a sliding groove and a sliding shaft at the connection between the first support member 430 and the third backrest 410 to achieve sliding), or a linkage connection. The movable connection between one end of the first support member 430 and the third backrest 410 can be a direct movable connection or a movable connection through an intermediate component. The other end of the first support member 430 is rotatably connected to the second linkage bracket 420. The rotatable connection between the other end of the first support member 430 and the second linkage bracket 420 can be a direct rotational connection or a rotational connection through an intermediate component. The second linkage bracket 420 and the third backrest 410 form a linkage relationship through the first support member 430.

[0487] When the third backrest 410 is subjected to an external force toward the rear of the seat, the second linkage bracket 420 rotates relative to the third base 480 toward the rear of the seat. This external force causing the third backrest 410 to rotate toward the rear of the seat can be pressure applied by the user, or a driving force applied by a motor, cylinder, or other drive element mounted on the seat. For example, when the user reclines, applying a rearward pressure to the third backrest 410, the second linkage bracket 420, the third backrest 410, and the first support member 430 form a linkage relationship, causing the second linkage bracket 420 to rotate relative to the third base 480 toward the rear of the seat, simultaneously rotating the third backrest 410 toward the rear of the seat. Optionally, the second linkage bracket 420 can also be subjected to an external force toward the rear of the seat, which can be achieved through a driving force applied by a motor, cylinder, or other drive element mounted on the seat, or by an external force applied by the user.

[0488] Similarly, when the third backrest 410 or the second linkage bracket 420 is subjected to a forward external force, the forward external force causes the third backrest 410 to rotate toward the front of the seat along with the second linkage bracket 420, or the forward external force acts directly on the second linkage bracket 420, causing the second linkage bracket 420 to rotate toward the front of the seat, and the second linkage bracket 420 drives the third backrest 410 to rotate forward.

[0489] The third backrest 410 and the second linkage bracket 420 can move relative to each other. For example, the relative movement between the two can be relative movement between the first support member 430 and the third backrest 410, which can be relative sliding, relative rotation, relative sliding and rotation, etc.; the first support member 430 and the second linkage bracket 420 can rotate relative to each other. That is, the third backrest 410 can automatically adjust its position to adapt to the user's sitting posture by moving relative to each other between the first support member 430 and the second linkage bracket 420.

[0490] Meanwhile, the second support member 440 includes, but is not limited to, the following states:

[0491] Firstly, one end of the second support member 440 is rotatably connected to the first support member 430, and the other end of the second support member 440 is connected to the third base 480. This allows the first support member 430 to rotate relative to the second linkage bracket 420 or move relative to the third backrest 410 when the second linkage bracket 420 moves or the third backrest 410 moves relative to the second linkage bracket 420. Through its rotatable connection with the first support member 430 and its connection with the third base 480, the second support member 440 can support the first support member 430 and thus the third backrest 410 without restricting the rotation of the first support member 430 relative to the second linkage bracket 420 or its movement relative to the third backrest 410.

[0492] Secondly, one end of the second support member 440 is rotatably connected to the third backrest 410, and the other end is connected to the third base 480 (exemplarily, it can be a fixed connection), so that the second support member 440 directly supports the third backrest 410. When the second linkage bracket 420 rotates, thereby driving the third backrest 410 to move, or when the third backrest 410 moves relative to the third base 480 or the second linkage bracket 420, the third backrest 410 and the second support member 440 can rotate relative to each other.

[0493] That is, since the connection between the first support member 430 and the third backrest 410 is movable and rotatably connected to the second linkage bracket 420, the mechanism composed of the third backrest 410, the first support member 430 and the second linkage bracket 420 is a relatively free mechanism. Therefore, the second support member 440 is further provided as the support base for the first support member 430 and / or the third backrest 410, so that when the third backrest 410 and / or the second linkage bracket 420 are not subjected to external forces, the third backrest 410 can maintain a stable state relative to the third base 480 and / or the second linkage bracket 420. This allows the third backrest 410, the first support member 430, the second linkage bracket 420 and the second support member 440 to form a relatively stable linkage mechanism when not subjected to external forces, and the third backrest 410 and / or the second linkage bracket 420 can move along a predetermined direction / trajectory when subjected to external forces.

[0494] In summary, in the seat back assembly of this application, the third backrest 410 is connected to the second linkage bracket 420 via the first support member 430. One end of the first support member 430 is movably connected to the third backrest 410, and the other end is rotatably connected to the second linkage bracket 420. One end of the second support member 440 is rotatably connected to the first support member 430 or rotatably connected to the third backrest 410, and the other end is connected to the third base 480. A relatively stable linkage mechanism is formed between the third backrest 410, the second linkage bracket 420, the first support member 430, the second support member 440, and the third base 480. When the third backrest 410 is subjected to pressure towards the rear of the seat, the third backrest 410 can be moved relative to the seat backrest through the movable connection between the first support member 430 and the third backrest 410. When the first support member 430, the second linkage bracket 420, and / or the third base 480 move (slide, rotate, slide and rotate), and the third backrest 410 or the second linkage bracket 420 is subjected to pressure toward the rear of the seat, causing the second linkage bracket 420 to rotate relative to the third base 480, the second linkage bracket 420 can drive the third backrest 410 to move relative to the base through the movable connection between the first support member 430 and the third backrest 410, and the rotational connection of the second linkage bracket 420. At the same time, the second support member 440 is rotatably connected to the first support member 430 or the third backrest 410, and its other end is connected to the third base 480. When it provides support for the first support member 430 or the third backrest 410, it can also rotate relative to the first support member 430 or the third backrest 410. Similarly, when the third backrest 410 or the second linkage bracket 420 is subjected to an external force toward the front of the seat, the second linkage bracket 420 rotates toward the front of the seat, and the third backrest 410 follows the second linkage bracket 420 to rotate toward the front of the seat, and can move relative to the first support member 430, the second linkage bracket 420, and / or the third base 480 (sliding, rotating, sliding and rotating). Through the above arrangement, when a user uses the seat and their back and / or waist exert force on the third backrest 410 to adjust their sitting posture, the third backrest 410 can adaptively move with the user's sitting posture adjustment to better fit the user's back and / or waist, providing better support, reducing pressure on the user's back and / or waist, and improving the comfort of the seat.

[0495] Referring to Figures 41 and 42, as an exemplary solution of the above embodiments, in some embodiments, one end of the first support member 430 proposed in the present application is rotatably connected to the third backrest 410.

[0496] In this embodiment, one end of the first support member 430 is rotatably connected to the third backrest 410, and the other end is rotatably connected to the second linkage bracket 420.

[0497] As described in the foregoing embodiments, when the third backrest 410 is subjected to an external force toward the rear of the seat, the third backrest 410 can move relative to the second linkage bracket 420. When the third backrest 410 / second linkage bracket 420 is subjected to an external force toward the rear of the seat, causing the second linkage bracket 420 to rotate toward the rear of the seat relative to the third base 480, the third backrest 410 rotates toward the rear of the seat along with the second linkage bracket 420, and the backrest can also move relative to the second linkage bracket 420. When the user reclines / lies back, applying pressure toward the rear of the seat to the third backrest 410, the third backrest 410 can rotate relative to the second linkage bracket 420, or rotate toward the rear of the seat together with the second linkage bracket 420.

[0498] When a user applies pressure to the third backrest 410, the third backrest 410 can rotate relative to the second linkage bracket 420. This rotation allows the third backrest 410 to adaptively adjust its angle and / or position according to the user's back and / or lumbar curve and / or position. When the pressure applied by the user causes the second linkage bracket 420 to rotate relative to the third base 480 toward the rear of the seat, the third backrest 410 tilts toward the rear of the seat along with the second linkage bracket 420 through the connection of the first support member 430. The first support member 430 rotates relative to the third backrest 410 and / or the second linkage bracket 420, and the third backrest 410 rotates relative to the second linkage bracket 420 and / or the third base 480, thereby adjusting the position and / or angle of the third backrest 410. The adjustment of the position and / or angle of the third backrest 410 provides better support for the user's back and / or lumbar region, enabling the third backrest 410 to adapt to the user's sitting posture.

[0499] It is conceivable that the rotational connection between one end of the first support member 430 and the third backrest 410 can be either a direct hinge between the first support member 430 and the third backrest 410, or an indirect rotational connection through an intermediate component. For example, a ball joint or a pivot assembly can be used to connect the two.

[0500] In one exemplary embodiment, the first support member 430 proposed in this application is a connecting rod, one end of which is rotatably connected to the third backrest 410, and the other end of which is rotatably connected to the second linkage bracket 420.

[0501] In another example, the first support member 430 includes a first drive member 431, which includes an output end 4311 and a connecting end 4312. One of the output end 4311 and the connecting end 4312 is rotatably connected to the third backrest 410, and the other of the output end 4311 and the connecting end 4312 is rotatably connected to the second linkage bracket 420.

[0502] The first driving member 431 is used to drive at least a portion of the third backrest 410 to approach or move away from the second linkage bracket 420.

[0503] In the above exemplary embodiment, when the first support member 430 is a linkage, a linkage mechanism is formed between the first support member 430, the second support member 440, the third backrest 410, and the second linkage bracket 420. When pressure is applied to the third backrest 410 / second linkage bracket 420 toward the rear of the seat or when the user is reclining / lying back in the seat, the third backrest 410 can adaptively adjust its position and / or angle by rotating the first support member 430 and the second support member 440 relative to the second linkage bracket 420 to adapt to changes in the user's sitting posture and provide more comfortable support.

[0504] When the first support member 430 includes a first driving member 431, unlike the above-mentioned scheme where the first support member 430 is a connecting rod, the first driving member 431 includes an output end 4311 and a connecting end 4312. One of the output end 4311 and the connecting end 4312 is rotatably connected to the third backrest 410, and the other of the output end 4311 and the connecting end 4312 is rotatably connected to the second linkage bracket 420. The first driving member 431 can provide driving force to extend or retract the output end 4311, changing the distance between the output end 4311 and the connecting end 4312, so that the third backrest 410... At least partially, the third backrest 410 can provide different levels of support by moving away from or close to the user's back. The user can customize the extension / retraction distance of the output end 4311 as needed, based on the curve of their back and / or waist or the flexibility of their back, to achieve different levels of support for the user's back and / or waist. In addition, the third backrest 410 and the second linkage bracket 420 are rotatably connected through the first support member 430. When the third backrest 410 moves closer to or further away from the user's back, the third backrest 410 can adaptively rotate relative to the second linkage bracket 420 to provide a more fitting support. For example, the first driving member 431 is a driving electric cylinder, and its output end 4311 is located at the connection end between the extendable piston rod and the third backrest 410. The first driving member 431 provides driving force, causing the piston rod to extend, and the output end 4311 to move away from the connection end 4312 connected to the second linkage bracket 420, causing the third backrest 410 to move towards the user's back. That is, in this exemplary embodiment, the first driving member 4311 of the first support member 430 can not only act as a connecting rod, but also has the function of acting as a connecting rod compared to the first support member 430. The larger adjustment range of the third backrest 410 allows the third backrest 410 to be adjusted in a wider range of angles and / or positions relative to the second linkage bracket 420 via the first support member 430 and the second support member 440, so as to better adapt to the position / curve of the user's back and / or waist, providing a more fitting support effect. Furthermore, the user can customize the extension / retraction length of the piston rod according to their own back and / or waist curve (i.e., adjust the support of the third backrest 410 for the back and / or waist), providing more comfortable support and adaptive adjustment.

[0505] The first driving member 431 can drive at least a portion of the third backrest 410 to approach or move away from the linkage bracket, that is, drive at least a portion of the third backrest 410 away from or approach the direction of the human back.

[0506] Specifically, the third backrest 410 can be divided into a lumbar support part and a back support part, and the first drive member 431 can drive the lumbar support part and / or the back support part to approach or move away from the human back.

[0507] In some embodiments, the first drive member 431 of the first support member 430 can also be connected to the second linkage bracket 420 via an intermediate member. For example, as shown in Figures 3 and 4, the first support member 430 proposed in this application embodiment further includes a mounting base 432 connected to the connecting end 4312 of the first drive member 431, wherein:

[0508] Mounting base 432 is rotatably connected to second linkage bracket 420; and / or, second support member 440 is rotatably connected to mounting base 432.

[0509] As an example of the rotatable connection between the mounting base 432 and the second linkage bracket 420, the mounting base 432 is constructed with a first rotating part, and the second linkage bracket 420 is constructed with a second rotating part adapted to the first rotating part. The mounting base 432 is rotatably connected to the second linkage bracket 420 through the cooperation of the first rotating part and the second rotating part.

[0510] Optionally, the first rotating part and the second rotating part can be hinged together, so that the mounting base 432 can be hinged to the second linkage bracket 420. Similarly, the second support member 440 and the mounting base 432 can also be connected by hinge. The mounting base 432, as an intermediate part, serves as a mounting base for the stable installation of the first driving member 431, and also facilitates rotatable connection with the second linkage bracket 420 and / or the second support member 440, serving as a rotational base.

[0511] In some embodiments, referring to Figures 45 to 48, the third backrest 410 and / or the second linkage bracket 420 proposed in this application embodiment are provided with a first mating structure 451, and the first support member 430 is provided with a second mating structure 452 adapted to the first mating structure 451, and the first mating structure 451 is rotatably connected to the second mating structure 452.

[0512] The first mating structure 451 can be integrally set with the third backrest 410 and / or the second linkage bracket 420, or it can be set separately. Similarly, the second mating structure 452 can be integrally set with the first support member 430 or set separately.

[0513] The first mating structure 451 and the second mating structure 452 can be directly hinged, or connected by a ball joint; or connected by a circular guide rail. One of them can rotate on the circular guide rail, so that the third backrest 410 rotates relative to the second linkage bracket 420.

[0514] As an example, one of the first mating structure 451 and the second mating structure 452 is a second receiving groove, and the other is a receiving element that can rotate within the second receiving groove.

[0515] The second receiving groove (first mating structure 451) is designed as a generally concave structure, which can accommodate the receiving member (second mating structure 452) and provide a relatively constrained movement trajectory for the receiving member. The shape of the receiving member roughly matches the concave structure. It should be noted that while the receiving member can rotate within the second receiving groove, it can also slide slightly within the second receiving groove, thereby achieving rotational (and / or sliding) engagement between the receiving member and the second receiving groove. The receiving member can be a spherical connector, a similar spherical connector, or an elastic member, which can freely rotate (and / or slide) within the second receiving groove, providing multi-directional movement capabilities.

[0516] During assembly, the receiving component can be inserted into the second receiving groove. The structure of the second receiving groove can be designed to confine the receiving component within the groove, preventing it from falling out.

[0517] For example, the third backrest 410 is provided with a first mating structure 451, and the first support member 430 is provided with a second mating structure 452. The first mating structure 451 is a ball connector or elastic silicone, and the second mating structure 452 is a second receiving groove. The ball connector or elastic silicone mates with the second receiving groove to achieve a rotatable connection. It should be noted that when using elastic silicone, because elastic silicone has a certain degree of elasticity, it allows the third backrest 410 and / or the second linkage bracket 420 to rotate with the first support member 430 while also allowing for a small range of sliding, thereby achieving adaptive adjustment of the third backrest 410 to provide a better fit.

[0518] When the third backrest 410 is subjected to pressure applied by the user or an external force is applied to the third backrest 410 / second linkage bracket 420 toward the rear of the seat, the third backrest 410 moves relative to the second linkage bracket 420 and / or the third base 480, and the accommodating member rotates (and / or slides) relative to the second accommodating groove. Since the design of the accommodating member allows free movement in multiple dimensions, the tilting or adaptive adjustment of the third backrest 410 can cause the accommodating member to slide and / or rotate in the second accommodating groove, thereby enabling the third backrest 410 to automatically adjust its angle and / or position to adapt to changes in the user's sitting posture.

[0519] In some embodiments, referring to FIG49, the backrest assembly further includes an adapter 460 having a first connecting portion 461 configured to connect to a third backrest 410 and a second connecting portion 462 configured to connect to a first support member 430, wherein:

[0520] The first connecting part 461 is movably connected to the third backrest 410; or

[0521] The second connecting part 462 is movably connected to the first supporting member 430.

[0522] In this embodiment, as one of the specific implementations of the first support member 430 being movably connected to the third backrest 410, the first support member 430 can be indirectly movably connected to the third backrest 410 via an adapter 460 as an intermediate component. The forms of its movable connection include, but are not limited to, the following:

[0523] Firstly, the first connecting part 461 of the adapter 460 is rotatably connected to the third backrest 410, and the second connecting part 462 is fixedly connected to the first support member 430.

[0524] When the third backrest 410 is subjected to an external force toward the rear of the seat, such as when the user leans against the third backrest 410 and reclines / lies back, the third backrest 410 and the first connecting part 461 can rotate relative to each other. Since the second connecting part 462 of the adapter 460 is connected to the second linkage bracket 420 through the first support member 430, the third backrest 410 can rotate relative to the second linkage bracket 420 / first support member 430 through the adapter 460.

[0525] Secondly, the first connecting part 461 of the adapter 460 is fixedly connected to the third backrest 410, and the second connecting part 462 is rotatably connected to the first support member 430.

[0526] When the third backrest 410 is subjected to an external force toward the rear of the seat, such as when the user leans against the third backrest 410 and reclines / liees back, the second connecting part 462 and the first support member 430 can rotate relative to each other. Since the first connecting part 461 of the adapter 460 is connected to the third backrest 410, the third backrest 410 can rotate relative to the second linkage bracket 420 / first support member 430 through the adapter 460.

[0527] Third, the first connecting part 461 of the adapter 460 is slidably connected to the third backrest 410, and the second connecting part 462 is fixedly connected to the first support member 430.

[0528] When the third backrest 410 is subjected to an external force toward the rear of the seat, such as when the user leans against the third backrest 410 and reclines / lies back, the third backrest 410 and the first connecting part 461 can slide relative to each other. Since the third backrest 410 is connected to the first support member 430 through the adapter 460, the third backrest 410 can slide relative to the second linkage bracket 420 / first support member 430 through the adapter 460.

[0529] Fourth, the first connecting part 461 of the adapter 460 is fixedly connected to the third backrest 410, and the second connecting part 462 is slidably connected to the first support member 430.

[0530] When the third backrest 410 is subjected to an external force toward the rear of the seat, such as when the user leans against the third backrest 410 and reclines / lies back, the third backrest 410 and the second connecting part 462 can slide relative to each other. Since the third backrest 410 is connected to the first support member 430 through the adapter 460, the third backrest 410 can slide relative to the second linkage bracket 420 / first support member 430 through the adapter 460.

[0531] Fifth, the first connecting part 461 of the adapter 460 is slidably and rotatably connected to the third backrest 410, and the second connecting part 462 is fixedly connected to the first support member 430.

[0532] When the third backrest 410 is subjected to an external force toward the rear of the seat, such as when the user leans against the third backrest 410 and reclines / lies back, the third backrest 410 and the first connecting part 461 can slide and rotate relative to each other. For example, the third backrest 410 and the first connecting part 461 achieve sliding and rotation through the cooperation of the sliding groove and the sliding shaft. Since the third backrest 410 is connected to the first support member 430 through the adapter 460, the third backrest 410 can slide and rotate relative to the second linkage bracket 420 / first support member 430 through the adapter 460.

[0533] Sixth, the first connecting part 461 of the adapter 460 is fixedly connected to the third backrest 410, and the second connecting part 462 is slidably and rotatably connected to the first support member 430.

[0534] When the third backrest 410 is subjected to an external force toward the rear of the seat, such as when the user leans against the third backrest 410 and reclines / lies back, the third backrest 410 and the second connecting part 462 can slide and rotate relative to each other. For example, the third backrest 410 and the second connecting part 462 achieve sliding and rotation through the cooperation of the sliding groove and the sliding shaft. Since the third backrest 410 is connected to the first support member 430 through the adapter 460, the third backrest 410 can slide and rotate relative to the second linkage bracket 420 / first support member 430 through the adapter 460.

[0535] As an example, the first connecting part 461 is rotatably connected to the third backrest 410, and the second connecting part 462 is fixedly connected to the output end 4311 of the first driving member 431 of the first support member 430.

[0536] In some embodiments, referring to FIG49, the first connecting portion 461 and the second connecting portion 462 of the adapter 460 are arranged at an angle.

[0537] In this embodiment, the first connecting portion 461 and the second connecting portion 462 are arranged at an angle, specifically, they are arranged at an angle in the direction toward the third backrest 410. The angle ranges from 90° to 180°, and for example, the angles are 110° and 120°.

[0538] The purpose of the angled arrangement between the first connecting part 461 and the second connecting part 462 is:

[0539] Firstly, it provides an angular transition for the connection between the first support member 430 and the third backrest 410.

[0540] Secondly, the angled setting helps improve the force transmission between the third backrest 410 and the first support member 430. Due to the differentiated angles of the two connecting parts, external forces (such as the user's back pressure) on the third backrest 410 are more rationally transmitted to the first support member. This reduces concentrated stress, lowers the risk of structural damage, and improves the stability of the support.

[0541] Thirdly, it adapts to ergonomic needs. The angle setting allows the adapter to adapt to the body shape and sitting posture of different users. When users of different body types change their sitting posture, the angle design allows the third backrest 410 to better conform to the curve of the user's back when it rotates relative to the third base 480, providing a more personalized user experience, improving the comfort of the seat, and meeting the needs of a wide range of users.

[0542] In some embodiments, as another form of movable connection between the first support member 430 and the third backrest 410, the backrest assembly proposed in this application embodiment further includes a first elastic member for connecting the first support member 430 and the third backrest 410.

[0543] In this embodiment, the design of the first elastic element provides a flexible and adaptable connection, allowing the third backrest 410 to move relative to the first support member 430 when subjected to external force. The material and structure of the first elastic element can adapt to changes in the user's sitting posture to a certain extent, improving the support effect and comfort of the third backrest 410 when the user adjusts their sitting posture, such as reclining or lying back.

[0544] The first elastic element not only serves as a connecting component, but also absorbs impact and cushions pressure. When the user leans against the third backrest 410, the first elastic element can absorb some of the external force, providing a certain cushioning effect for the user's back and improving the comfort of the third backrest 410.

[0545] The types and implementation methods of the first elastic element include, but are not limited to, the following:

[0546] Firstly, silicone elastic components. Silicone material has good elasticity and flexibility, and can be made into specific shapes to adapt to the connection between the backrest and the support components.

[0547] For example, the silicone elastic element can be directly embedded between the first support member 430 and the third backrest 410 as an intermediate connecting layer, so that the backrest can adapt to the movement changes of the third backrest 410 relative to the second linkage bracket 420 when the user tilts or changes sitting posture, adjusting its angle and / or position to adaptively support the user's back. The silicone elastic element can be compressed or deformed under force, thereby achieving a movable connection, allowing the third backrest 410 to move relative to the second linkage bracket 420 within a certain range.

[0548] Secondly, the spring. Springs are typically made of metal, possessing good durability and elasticity, and can compress or stretch to adapt to different loading conditions. The spring can be positioned between the first support member 430 and the third backrest 410, utilizing the compression and extension of the spring to achieve a dynamic connection between the two.

[0549] When the user leans back, the spring is compressed, generating a corresponding reaction force. At the same time, while supporting the third backrest 410, the spring maintains a certain tension, ensuring that the third backrest 410 can lean back comfortably without tilting too much.

[0550] The design of the first elastic element increases the degree of freedom of movement between the third backrest 410 and the first support member 430, allowing it to adapt to different user sitting postures. Furthermore, the shock and pressure absorption properties of the first elastic element provide a more comfortable experience for the user when changing sitting postures, reducing fatigue caused by improper posture.

[0551] Whether it's silicone elastic components or springs, they can effectively distribute pressure from the user, reduce excessive local loads, and thus reduce the risk of structural damage. Furthermore, the first elastic component can adapt to individual differences among users, whether it's body shape, sitting posture, or habits, allowing the third backrest 410 to adapt its movement to provide support, thereby enhancing the comfort of the seat.

[0552] In some embodiments, the backrest assembly proposed in this application further includes a connecting member 470, which is used to connect the first support member 430 and the second linkage bracket 420, wherein:

[0553] One end of the connecting member 470 is rotatably connected to the first support member 430, and the other end is driveably connected to the second linkage bracket 420.

[0554] In some embodiments, one end of the connecting member 470 is rotatably connected to the first support member 430, and the other end is kinetically connected to the second linkage bracket 420.

[0555] In the above embodiment, one end of the connecting member 470 is rotatably connected to the first supporting member 430, and the other end is driveably connected to the second linkage bracket 420. The rotatable connection between the connecting member 470 and the first supporting member 430 can be a direct rotatable connection or an indirect rotatable connection through an intermediate component. The function of the connecting member 470 is:

[0556] Since the connection between the first support member 430 and the third backrest 410 / second linkage bracket 420 is movable, the mechanism composed of the third backrest 410, the first support member 430 and the second linkage bracket 420 is a relatively free mechanism. Therefore, the second support member 440 is further provided as the support base for the first support member 430 and / or the third backrest 410, so that when the third backrest 410 and / or the second linkage bracket 420 are not subjected to external forces, the first support member 430 and / or the third backrest 410 can be in a relatively stable state relative to the third base 480, so that the third backrest 410, the first support member 430, the second linkage bracket 420 and the second support member 440 form a relatively stable linkage mechanism. The second support member 440 is a support component connected to the third base 480. To further enhance the stability of the linkage structure, the first support member 430 and the second linkage bracket 420 are further connected by a connecting member 470. The connecting member 470 can support the first support member 430 and the second linkage bracket 420 on the side of the first support member 430 away from the second support member 440. The first support member 430, the second support member 440 and the connecting member 470 constitute a linkage structure in which the third backrest 410 is more stably connected to the second linkage bracket 420 and the third base 480.

[0557] As an example, the connecting member 470 is rotatably connected to the second linkage bracket 420, for example, directly hinged to the second linkage bracket 420. When the third backrest 410 is subjected to an external force toward the rear of the seat, for example, when the user leans against the third backrest 410 and reclines / lies back, the third backrest 410 can rotate with the second linkage bracket 420 through the connection of the first support member 430 with the second linkage bracket 420. The connecting member 470 rotates relative to the second linkage bracket 420 with the movement of the first support member 430 and / or the second linkage bracket 420.

[0558] Optionally, the connecting member 470 is slidably connected to the second linkage bracket 420. For example, by setting a slider to be slidably connected to the second linkage bracket 420, the connecting member 470 is connected to the slider. When the third backrest 410 is subjected to an external force toward the rear of the seat, such as when the user leans against the third backrest 410 and reclines / lies back, the third backrest 410 can rotate with the second linkage bracket 420 through the connection of the first support member 430 and the second linkage bracket 420. The connecting member 470 slides relative to the second linkage bracket 420 as the first support member 430 and / or the second linkage bracket 420 move.

[0559] In some embodiments, referring to FIG50, as another form of support for the third backrest 410 by the second support member 440, one end of the second support member 440 proposed in this application embodiment is fixedly connected to the third base 480, and the other end is rotatably connected to the third backrest 410.

[0560] In this embodiment, one end of the first support member 430 is fixedly connected to the third base 480, and the other end is rotatably connected to the third backrest 410. The second support member 440 and the first support member 430 can be spaced apart along the vertical direction of the second linkage bracket 420 or the front-back direction of the seat.

[0561] As described in the foregoing embodiments, the function of the second support member 440 is to directly or indirectly support the third backrest 410. Therefore, the second support member 440 can also be directly connected to the third backrest 410, rather than being rotatably connected to the first support member 430 as described in the foregoing embodiments.

[0562] The rotatable connection between the second support member 440 and the third backrest 410 can be referred to the aforementioned example of the rotatable connection between the first support member 430 and the third backrest 410, which will not be repeated here.

[0563] For example, when pressure is applied toward the rear of the seat to the third backrest 410 or the second linkage bracket 420, the third backrest 410 moves relative to the second linkage bracket 420 and / or the third base 480 through the connection of the first support member 430 and the second support member 440. When the second linkage bracket 420 rotates rearward relative to the third base 480, the third backrest 410 follows the second linkage bracket 420 to rotate toward the rear of the seat, and the third backrest 410 rotates relative to the second linkage bracket 420 and / or the third base 480 through the rotatable connection with the first support member 430 and the second support member 440.

[0564] In the embodiment described above, where the second support member 440 connects to the third backrest 410 and the third base 480, the third base 480 serves as the foundation of the entire seat structure, bearing the weight of the human body and various pressures that may arise during use, possessing sufficient strength and stability. Furthermore, the third base 480 is a key component connecting the main body of the seat (such as the second linkage bracket 420), combining various components together through specific connection methods (such as fixed connection, rotatable connection, etc.) to form a complete seat structure. The seat cushion is typically located on the base; when a person sits on the seat, they sit on the cushion, which provides support for the buttocks and thighs. In this embodiment, the third base 480 can be considered a separate chassis (the supporting foundation of the seat), or it can refer to the seat cushion (or seat pad), or it can be an integrated structure of the base and seat cushion. That is, one end of the second support member 440 can be fixedly connected to the base, or it can be fixedly connected to the seat cushion, or it can be connected to an integrated structure of the base and seat cushion. No limitations are imposed here.

[0565] Further, referring to FIG41, this application proposes a seat, including a seat body 490, a third base 480 mounted on the seat body, and a backrest assembly as described in the foregoing embodiments mounted on the seat body 490. The third base 480 and the backrest assembly are rotatably connected via a second linkage bracket 420 in the backrest assembly.

[0566] In related technologies, the headrest is fixed to the backrest. When the user sits in the chair and leans back, the headrest rotates backward with the backrest. The relative position between the headrest and the backrest remains unchanged, which causes the user's head and / or neck to lose support or be poorly supported, resulting in poor overall comfort. Furthermore, during this process, as the reclining angle increases, the user's line of sight gradually changes from looking straight ahead to looking upward, thus making it unsuitable for reclining while working.

[0567] Referring to Figures 51 to 56, which are schematic diagrams of the structure of a seat and its components in one embodiment of this application:

[0568] This application also proposes a seat, as shown in Figures 51 and 52, the seat comprising:

[0569] Fourth base 510;

[0570] The second backrest support 520 is rotatably connected to the fourth base 510 and is configured to connect to the fourth backrest 550.

[0571] The second sliding member 530 is slidably disposed on the second backrest bracket 520;

[0572] The second headrest 540 is disposed on the second sliding member 530;

[0573] When the second backrest support 520 rotates, the second slider 530 slides on the second backrest support 520 to drive the second headrest 540 to move.

[0574] In this embodiment, the fourth base 510 (also referred to as the chassis) serves as the foundation of the entire seat structure, bearing the weight of the human body and various pressures that may arise during use, possessing sufficient strength and stability. Furthermore, the fourth base 510 is a crucial component connecting the main body of the seat (such as the fourth backrest 550, the second seat cushion 570, etc.), and it combines the various components together through specific connection methods (such as fixed connection, rotatable connection, etc.) to form a complete seat structure.

[0575] The second backrest support 520 can be located at the rear of the fourth base 510 to provide support for the back and / or waist in conjunction with the fourth backrest 550. The second backrest support 520 is generally rod-shaped, extending longitudinally along the seat. Its shape can be various, such as arc, S-shape, L-shape, etc., depending on the actual structural requirements. To ensure sufficient support strength, the second backrest support 520 can be made of materials such as metal (e.g., steel, aluminum alloy), plastic, etc. The second backrest support 520 can be an integral part of the fourth backrest 550, such as being integrated with the fourth backrest 550, or it can be connected to the fourth backrest 550 to support it. For example, using the front-back and side-to-side directions of the seat as a reference, the fourth backrest 550 is located in front of the second backrest support 520 and connected to it. Furthermore, when the second backrest support 520 is assembled with the fourth base 510, it is rotatably connected to the fourth base 510 via its lower part. When the user sits in the chair, their back and / or lumbar region can lean back against the fourth backrest 550, and the second backrest support 520 provides support for the back and / or lumbar region accordingly. When switching from a seated position to a reclining / lying position, the second backrest support 520 can rotate synchronously to adapt to the user's sitting posture. In this embodiment, based on the function of the second backrest support 520, it can also be called a chair back support, a linkage support, etc., and the naming is not limited.

[0576] The second sliding member 530 is mounted on the second backrest bracket 520 and can slide on the second backrest bracket 520. Specifically, the second sliding member 530 can adopt a structure such as a slide rod, slide cylinder, slide seat, or slide frame to slide and cooperate with the second backrest bracket 520, realizing a slidable setting on the second backrest bracket 520. On the second backrest bracket 520, the second sliding member 530 can be set on the upper part of the second backrest bracket 520 to correspond to the upper part of the fourth backrest 550 (or it can be regarded as the part of the fourth backrest 550 used to support the back of the human body). The function of the second sliding member 530 includes supporting the sliding of other seat components (such as the second headrest 540).

[0577] The second headrest 540 provides support for the head and / or neck. Its structure may include a headrest frame, an inner headrest pad, and a headrest cover. The headrest frame may be made of metal or high-strength plastic, providing support and structural stability for the second headrest 540. The inner headrest pad may be made of soft foam material, such as polyurethane foam, providing comfortable head support and cushioning. The headrest cover covers the headrest frame and inner pad, and may be made of fabric, leather, or other comfortable materials, providing a comfortable feel and aesthetic appearance. In addition, the second headrest 540 may include adjustment mechanisms, such as height adjustment and angle adjustment, to meet the seating needs of different passengers. When a person is seated, their head and / or neck can rest against the second headrest 540, which provides corresponding support for the head and / or neck.

[0578] The second headrest 540 is mounted on the second sliding member 530. When the second backrest support 520 rotates, the second sliding member 530 slides on the second backrest support 520 to move the second headrest 540. The second backrest support 520, the second sliding member 530, and the second headrest 540 have a mutually cooperating action mechanism. When the second backrest support 520 is rotated by an external force, the second sliding member 530 not only rotates with the second backrest support 520 but also slides on it to move the second headrest 540.

[0579] The second slider 530 can slide on the second backrest support 520 as the second backrest support 520 rotates. For example, when a user leans against the second headrest 540, he applies force to the second headrest 540 and transmits it to the second slider 530 and the second backrest support 520, causing the second backrest support 520 to rotate backward and simultaneously causing the second slider 530 to slide on the second backrest support 520, thereby driving the second headrest 540 to move.

[0580] Alternatively, the second sliding member 530 can be connected to the fourth backrest 550. When the user leans against the fourth backrest 550, the force applied to the fourth backrest 550 increases when the user reclines. This force simultaneously acts on the second sliding member 530 and the second backrest support 520, causing the second backrest support 520 to rotate and the second sliding member 530 to slide on it, thereby moving the second headrest 540. Alternatively, a transmission structure can be configured based on the second sliding member 530, connected between the second sliding member 530 and the fourth base 510 or seat cushion 700. When the second backrest support 520 rotates backward, the transmission structure drives the second sliding member 530 in conjunction, specifically by pulling the second sliding member 530 so that it slides on the second backrest support 520, thereby moving the second headrest 540.

[0581] Alternatively, the seat may also include a drive mechanism, which consists of the following parts:

[0582] The detection structure monitors the rotation status of the second backrest bracket 520, such as angle sensors, encoders, etc.

[0583] The drive structure provides driving power, such as a motor, based on the detection data from the detection structure.

[0584] The transmission structure transmits the power of the drive structure to the second sliding member 530 so that the second sliding member 530 slides, such as a gear rack, chain, belt, etc.

[0585] In this embodiment, the second sliding member 530 allows the second headrest 540 to slide on the second backrest support 520 and move with the rotation of the second backrest support 520. When the user sits in the chair, leaning back against the fourth backrest 550 causes the fourth backrest 550 and the second backrest support 520 to rotate relative to the fourth base 510. At this time, the second sliding member 530 slides on the second backrest support 520 (e.g., downward) to move the second headrest 540 (e.g., downward). The second headrest 540 always follows the user's head and / or neck, providing sufficient support for the user's head and / or neck, which helps to improve the user's comfort when using the chair. Furthermore, the support angle of the second headrest 540 for the user's head and / or neck remains basically unchanged, so that the user's line of sight remains level, thereby supporting reclining work.

[0586] Furthermore, when the user changes from reclining to sitting upright, the fourth backrest 550 and the second backrest support 520 rotate relative to the fourth base 510 (the second backrest support 520 may be connected to a reset component, and the second backrest support 520 can rotate under the force provided by the reset component to perform a reset). At this time, the second slider 530 slides on the second backrest support 520 (for example, slides upward) to drive the second headrest 540 to move (for example, slides upward). The second headrest 540 always follows the user's head and / or neck, providing sufficient support for the user's head and / or neck.

[0587] That is, regardless of whether the user is reclining or sitting upright in the seat, the second headrest 540 will slide on the second backrest support 520 via the second slider 530 to adjust its position and / or angle accordingly, always following the user's head and / or neck to provide support, and ensuring that the user's line of sight remains level.

[0588] In some embodiments, as shown in Figures 52 and 53, the second backrest bracket 520 is provided with a second sliding cavity HQ2 extending in its longitudinal direction, and the second sliding member 530 is inserted into the second sliding cavity HQ2 and slides in cooperation with the second sliding cavity HQ2.

[0589] The second sliding cavity HQ2 on the second backrest support 520 is adapted to the second sliding member 530. The second sliding member 530 is slidably mounted on the second backrest support 520 by being inserted into the second sliding cavity HQ2. The second sliding member 530 can be a sliding rod. Optionally, as shown in Figure 53, the second sliding cavity HQ2 is located at the upper part of the second backrest support 520. The top of the second backrest support 520 has a second cavity opening Qk2 communicating with the second sliding cavity HQ2. This second cavity opening Qk2 is adapted to the outer contour of the second sliding member 530, and the second sliding member 530 is inserted into the second sliding cavity HQ2 through the second cavity opening Qk2. The extension length of the second sliding cavity HQ2 is not limited and can be set according to actual conditions.

[0590] When the second backrest bracket 520 rotates, the second sliding member 530 slides along the second sliding cavity HQ2. For example, when a user sits in the seat and leans back, the second backrest support 520 rotates relative to the fourth base 510 towards the rear of the seat. At this time, the second slider 530 slides downward along the second sliding cavity HQ2 of the second backrest support 520 (the second slider 530 continuously retracts into the second sliding cavity HQ2 at the second cavity opening Qk2) to move the second headrest 540 downward, thereby adjusting the position and / or angle of the second headrest 540. Alternatively, when the user changes from leaning back to sitting upright, the second backrest support 520 rotates relative to the fourth base 510 towards the front of the seat. At this time, the second slider 530 slides upward along the second sliding cavity HQ2 of the second backrest support 520 (the second slider 530 continuously extends outward from the second sliding cavity HQ2 at the second cavity opening Qk2) to move the second headrest 540 upward, thereby adjusting the position and / or angle of the second headrest 540.

[0591] The second sliding member 530 is slidably mounted on the second backrest bracket 520 by being inserted into the second sliding cavity HQ2 constructed by the second backrest bracket 520. It does not occupy additional thickness space in the front-back direction of the seat, nor does it occupy additional width space in the left-right direction of the seat.

[0592] In some embodiments, at least one of the second backrest bracket 520 and the second slider 530 is provided with a sixth sliding structure, which is configured to support the second slider 530 to slide along the second sliding cavity HQ2.

[0593] The second sliding member 530 is supported by the sixth sliding structure to slide along the second sliding cavity HQ2. The sixth sliding structure can be provided on the second backrest bracket 520, or on the second sliding member 530, or on both the second backrest bracket 520 and the second sliding member 530.

[0594] The sixth sliding structure can take various forms. For example, it may include a sliding groove in which the second sliding member 530 is partially housed, allowing it to slide by means of the groove's support. This is merely an example and not a limitation. In practical applications, when either the second backrest bracket 520 or the second sliding member 530 is provided with a sixth sliding structure, the structure of the sixth sliding structure can take, but is not limited to, one form.

[0595] Supported by the sixth sliding structure, the second sliding member 530 can slide smoothly along the second sliding cavity HQ2, which helps to improve the operational stability of the second headrest 540 sliding system.

[0596] In some embodiments, as shown in FIG53, when the second backrest bracket 520 is provided with a sixth sliding structure, the sixth sliding structure includes at least one second support member GJ2, and the at least one second support member GJ2 is rotatably protruding from the inner wall of the second sliding cavity HQ2 and forms a rolling contact with the second sliding member 530.

[0597] The sixth sliding structure employs a second support member GJ2, which is rotatably mounted on the second backrest bracket 520 and arranged on the inner wall of the second sliding cavity HQ2 in contact with the second sliding member 530. At least one second support member GJ2 may be provided; that is, one or more second support members GJ2 may be provided, such as two or three. When more than one second support member GJ2 is provided, these members may be spaced apart along the circumferential, transverse, or longitudinal direction of the second backrest bracket 520. Optionally, the second support member GJ2 may include a support wheel connected to a mounting shaft. The inner wall of the second sliding cavity HQ2 has a mounting groove, and the support wheel is at least partially accommodated in the mounting groove and rotatably mounted on the inner wall of the second sliding cavity HQ2 via the mounting shaft.

[0598] When the second sliding member 530 slides along the second sliding cavity HQ2, the second support member GJ2, which is in contact with the second sliding member 530, rotates accordingly (taking the second sliding member 530 as a stationary reference frame, the second support member GJ2 rolls along the surface of the second sliding member 530) to support the second sliding member 530 in sliding along the second sliding cavity HQ2. The rolling of the second support member GJ2 on the second backrest bracket 520 can greatly reduce the frictional resistance between it and the second sliding member 530, making the second sliding member 530 slide more easily and the sliding process smoother.

[0599] Accordingly, as an optional implementation, when the second sliding member 530 is provided with a sixth sliding structure, the sixth sliding structure may also include at least one second support member GJ2. At least one second support member GJ2 is rotatably protruding from the outer wall of the second sliding member 530 and forms a rolling contact with the second backrest bracket 520. The corresponding structural configuration, working principle and function can be referred to the above embodiments, and will not be repeated here.

[0600] In some embodiments, the outer wall of the second sliding member 530 is constructed with a second support groove extending along its longitudinal direction. The second support member GJ2 is accommodated in the second support groove and forms a rolling contact with the bottom wall of the groove. The number of second support grooves can be the same as or different from the number of second support members GJ2. For example, one or more second support members GJ2 are spaced apart along the circumferential or transverse direction of the second backrest bracket 520, and one or more second support grooves are correspondingly provided, with each second support member GJ2 accommodated in one second support groove. Alternatively, one or more second support members GJ2 are spaced apart along the longitudinal direction of the second backrest bracket 520, and only one second support groove is provided, with all of the second support members GJ2 accommodated in this second support groove. This is merely exemplary and not restrictive.

[0601] When the second slider 530 slides along the second sliding cavity HQ2, the second support member GJ2, which is in contact with the bottom wall of the second support groove, rotates within the second support groove (or rolls along the bottom wall of the second support groove, taking the second slider 530 as a stationary reference frame). This supports the second slider 530 as it slides along the second sliding cavity HQ2. The second support groove provides a clear trajectory for the second support member GJ2, ensuring that it moves in a predetermined direction and providing precise guidance for the sliding of the second slider 530.

[0602] In some embodiments, as shown in Figures 53 and 54, a second guide post DZ2 is provided on one of the outer wall of the second slider 530 and the inner wall of the second sliding cavity HQ2, and a second guide groove DC2 is provided on the other. The second guide post DZ2 is inserted into the second guide groove DC2 and slides in cooperation with the second guide groove DC2 to guide the second slider 530 to slide along the second sliding cavity HQ2.

[0603] In this embodiment, a second guide post DZ2 may be provided on the outer wall of the second sliding member 530, and a second guide groove DC2 may be provided on the inner wall of the second sliding cavity HQ2 to slide in cooperation with the second guide post DZ2; alternatively, a second guide post DZ2 may be provided on the inner wall of the second sliding cavity HQ2, and a second guide groove DC2 may be provided on the outer wall of the second sliding member 530 to slide in cooperation with the second guide post DZ2. The guiding structure of the second guide post DZ2 and the second guide groove DC2 may be provided in one or more sets. When more than one set of the guiding structure is provided, the more than one set of guiding structures may be spaced apart along the circumferential or transverse direction of the second backrest bracket 520. The second sliding member 530, through the cooperation of the second guide post DZ2 and the second guide groove DC2, is guided to slide in a predetermined direction when sliding along the second sliding cavity HQ2. Specifically, when the second slider 530 slides along the second sliding cavity HQ2, the second guide post DZ2 slides in the second guide groove DC2 to precisely guide the sliding direction of the second slider 530.

[0604] Besides the aforementioned structure in which the second backrest bracket 520 is provided with the second sliding cavity HQ2, the second sliding member 530 can also be slidably disposed on the second backrest bracket 520 in other forms, such as:

[0605] In some embodiments, the second slider 530 is sleeved on the second backrest bracket 520 and forms a sliding engagement with the second backrest bracket 520. The second slider 530 is constructed with a sliding hole that matches the outer contour of the second backrest bracket 520. The second backrest bracket 520 passes through the sliding hole of the second slider 530, and the second slider 530 is sleeved on the second backrest bracket 520 through the provided sliding hole, forming a sliding engagement with the second backrest bracket 520. When the second backrest bracket 520 rotates, the second slider 530 slides correspondingly on the second backrest bracket 520.

[0606] In some embodiments, as shown in FIG55, the second backrest support 520 is provided with an arc-shaped slide rail HG, and the second slider 530 slides in cooperation with the arc-shaped slide rail HG, which can drive the second headrest 540 to move along an arc trajectory. The notch of the arc-shaped slide rail HG faces the front side of the second backrest support 520.

[0607] When a user sits in the chair and leans back, the second backrest support 520 rotates backward relative to the fourth base 510. At this time, the second slider 530 slides along the arc-shaped slide rail HG of the second backrest support 520, which in turn drives the second headrest 540 to slide downward relative to the second backrest support 520 along the arc-shaped trajectory to adjust the position and / or angle of the second headrest 540. The second headrest 540 follows the user's head and / or neck and provides sufficient support, so that the user's line of sight remains level, supporting reclining office work.

[0608] When the user changes from reclining to sitting upright, the second backrest support 520 rotates forward relative to the fourth base 510. At this time, the second slider 530 slides along the arc-shaped slide rail HG of the second backrest support 520, which in turn drives the second headrest 540 to slide upward relative to the second backrest support 520 along the arc-shaped trajectory to adjust the position and / or angle of the second headrest 540. The second headrest 540 follows the user's head and / or neck and provides sufficient support.

[0609] In some embodiments, the second headrest 540 is rotatable.

[0610] As shown in Figure 51, the second headrest 540 may be equipped with a headrest bracket 541. The second headrest 540 is rotatably connected to the headrest bracket 541 and is mounted on the second sliding member 530 via the headrest bracket 541. The second headrest 540 is rotatable, allowing the user to adjust its support angle and / or position by rotating it. In specific usage scenarios, the rotatable design of the second headrest 540 helps to further improve the user's seating comfort. For example, when the user reclines in the seat, the second backrest bracket 520 rotates relative to the fourth base 510, and the second headrest 540 adjusts its position and / or angle under the action of the second sliding member 530. Simultaneously, the second headrest 540 can also rotate relative to the fourth backrest 550 to adapt to the position of the user's head and / or neck, thereby making the user's line of sight more accurately approach eye level.

[0611] The second headrest 540 can adaptively rotate based on the position of the user's head and / or neck, for example:

[0612] When a user is seated and their head and / or neck are resting against the second headrest 540, the second headrest 540 can rotate to accommodate changes in the user's head and / or neck angle. Specifically, this can include the following usage scenario: when the user leans back against the second headrest 540, the second headrest 540 rotates synchronously to ensure the user's line of sight remains level.

[0613] The rotation of the second headrest 540 can also be manually controlled, for example:

[0614] When a user sits in the seat, they can manually rotate the second headrest 540 to adjust its position and / or angle so that the second headrest 540 supports their head and / or neck.

[0615] In addition, the rotation of the second headrest 540 can also be electrically controlled, for example:

[0616] In some embodiments, the seat further includes:

[0617] The second drive unit is connected to the second headrest 540;

[0618] When the second backrest support 520 rotates, the second driving member drives the second headrest 540 to rotate. That is, the second headrest 540 establishes a linkage relationship with the second backrest support 520 through the provided second driving member, and the three have a mutually cooperating action mechanism. The second driving member synchronously drives the second headrest 540 to rotate according to the rotation of the second backrest support 520. The second driving member may include a motor, and the output shaft of the motor is connected to the rotating shaft of the second headrest 540. The motor operates to drive the second headrest 540 to rotate. Optionally, the second driving member is disposed on the second sliding member 530.

[0619] The second backrest support 520 may be equipped with a detection structure (such as an angle sensor, encoder, etc.) to monitor the rotation state of the second backrest support 520. The second drive unit provides driving power to the second headrest 540 based on the detection data from the detection structure, so that the second headrest 540 rotates.

[0620] Specifically, the following usage scenarios may be included: when the user leans back in the seat, the second backrest support 520 rotates relative to the fourth base 510, and the second drive unit synchronously drives the second headrest 540 to rotate so that the user's line of sight remains level.

[0621] In some embodiments, as shown in FIG51, the seat further includes:

[0622] The fourth backrest 550 is connected to the second sliding member 530;

[0623] When the second backrest support 520 rotates, the fourth backrest 550 rotates with the second backrest support 520 and drives the second sliding member 530 to slide on the second backrest support 520.

[0624] The second backrest support 520 is indirectly connected to the fourth backrest 550 via the second slider 530, thus providing support for the fourth backrest 550. Since the second slider 530 is slidably disposed on the second backrest support 520, and the fourth backrest 550 is connected to the second slider 530, the fourth backrest 550 can slide relative to the second backrest support 520 via the second slider 530. Alternatively, from another perspective, the second slider 530, in addition to supporting the sliding of the second headrest 540, also simultaneously supports the sliding of the fourth backrest 550.

[0625] When a user sits in the seat and leans back against the fourth backrest 550, the force applied to the fourth backrest 550 increases. This force simultaneously acts on the second sliding member 530 and the second backrest support 520, causing the second backrest support 520 to rotate. At the same time, the second sliding member 530 slides on the second backrest support 520 (e.g., downwards), which in turn moves the second headrest 540 (e.g., downwards) and simultaneously moves the fourth backrest 550. This allows for simultaneous adjustment of the angle and / or position of the second headrest 540 and the fourth backrest 550. In addition to the second headrest 540 following the user's head and / or neck, the fourth backrest 550 also follows the user's back and / or waist, providing sufficient support and further enhancing the user's comfort when using the seat.

[0626] In some embodiments, as shown in Figures 51, 52, and 54, the second slider 530 is provided with a backrest connecting portion 531, and the second slider 530 is hinged to the fourth backrest 550 through the backrest connecting portion 531. Optionally, a connecting shaft passes through the backrest connecting portion 531 of the second slider 530, and the fourth backrest 550 is directly or indirectly (i.e., through other intermediate members) connected to the connecting shaft to achieve hinged connection with the second slider 530.

[0627] The fourth backrest 550 is hinged to the second sliding member 530, allowing the fourth backrest 550 to rotate relative to the second sliding member 530. When the user leans against the fourth backrest 550 and reclines, the hinged connection allows the fourth backrest 550 to rotate relative to the second backrest support 520 within a certain range. Therefore, the fourth backrest 550 will rotate relative to the second backrest support 520 under the force of the human body, and adapt to changes in the user's posture, conforming to the user's body curves (back curve and / or waist curve), thus adapting to different sitting postures.

[0628] In some embodiments, as shown in FIG51, the seat further includes:

[0629] The rotating member 590 and the second sliding member 530 are spaced apart along the longitudinal direction of the seat. One end of the rotating member 590 is rotatably connected to the second backrest bracket 520, and the other end is drive-connected to the fourth backrest 550.

[0630] The rotating component 590 is mounted on the second backrest support 520 and can rotate on the second backrest support 520. Specifically, the rotating component 590 can adopt a structure such as a rotating rod or a rotating frame to rotatably connect with the second backrest support 520, thus achieving a rotatable setting on the second backrest support 520. On the second backrest support 520, the rotating component 590 can be set at the lower part of the second backrest support 520 to correspond to the lower half of the fourth backrest 550 (which can also be regarded as the part of the fourth backrest 550 used to support the human waist). The fourth backrest 550 and the rotating component 590 are connected by a transmission connection. Through the rotating component 590, the fourth backrest 550 can rotate relative to the second backrest support 520, and the rotating component 590 supports the rotation of the fourth backrest 550 on the second backrest support 520.

[0631] The power source for the rotation of rotating component 590 may be as follows:

[0632] When the user leans against the fourth backrest 550, the force applied to the fourth backrest 550 increases when the user leans back. The force on the fourth backrest 550 acts simultaneously on the rotating member 590 and the second backrest support 520, causing the second backrest support 520 to rotate backward and the rotating member 590 to rotate on the second backrest support 520, thereby supporting the fourth backrest 550 to rotate relative to the second backrest support 520.

[0633] That is, when the second backrest support 520 rotates relative to the fourth base 510, the fourth backrest 550 rotates on the second backrest support 520 via the rotating member 590.

[0634] In this embodiment, when a user sits in the chair and leans back against the fourth backrest 550, the fourth backrest 550 and the second backrest support 520 rotate relative to the fourth base 510. At the same time, the rotating component 590 rotates on the second backrest support 520 (for example, downward) to drive the fourth backrest 550 to move (for example, downward) to adjust the position and / or angle of the fourth backrest 550, so that the fourth backrest 550 follows the user's body part (such as the waist) to provide support, adapts to the user's posture changes, and improves the user's comfort when using the chair.

[0635] In some embodiments, as shown in Figures 52 and 56, the seat further includes:

[0636] The transmission structure 560 is connected to the second sliding member 530, and the transmission structure 560 is also connected to the fourth base 510 or the second seat cushion 570 of the seat.

[0637] When the second backrest support 520 rotates, the transmission structure 560 drives the second sliding member 530 to slide on the second backrest support 520.

[0638] The function of the transmission structure 560 is to drive the second sliding member 530 on the second backrest support 520 to slide when the second backrest support 520 rotates.

[0639] The transmission structure 560 can be connected to the fourth base 510 or to the second seat cushion 570 of the seat. The transmission principle of the transmission structure 560 is as follows: when the second backrest support 520 rotates, the relative angle / position between the second backrest support 520 and its second sliding member 530 and the fourth base 510 and the second seat cushion 570 of the seat changes. Therefore, the transmission structure 560 between the fourth base 510 or the second seat cushion 570 and the second sliding member 530 synchronously pulls the second sliding member 530, causing the second sliding member 530 to slide on the second backrest support 520. The transmission connection involved can include hinges, rotational connections, sliding connections, etc., and this embodiment does not limit this. As an optional implementation, the fourth base 510 or the second seat cushion 570 of the seat is provided with a mounting frame 580 (or referred to as a cushion frame, base frame, linkage frame, etc.), and the transmission structure 560 is connected to the mounting frame 580 to connect with the fourth base 510 or the second seat cushion 570 of the seat.

[0640] In this embodiment, when the second backrest support 520 rotates, the transmission structure 560 transmits power to the second sliding member 530, causing the second sliding member 530 to slide on the second backrest support 520.

[0641] The transmission structure 560 can take various structural forms, such as:

[0642] In some embodiments, as shown in FIG52, the transmission structure 560 includes a linkage structure 561, one end of which is hinged to the second sliding member 530, and the other end of which is throttle connected to the fourth base 510 or the second cushion 570 of the seat.

[0643] The transmission structure 560 adopts a linkage structure 561. In the linkage structure 561, there can be one or more linkages, and the number of linkages is not limited. As an example, as shown in Figure 52, there are two linkages, namely a first linkage 5611 and a second linkage 5612. The first linkage 5611 and the second linkage 5612 are directly or indirectly connected by a hinge. The end of the first linkage 5611 away from the second linkage 5612 is hinged to the second sliding member 530, and the end of the second linkage 5612 away from the first linkage 5611 is connected (e.g., hinged) to the fourth base 510 or the second seat cushion 570 of the seat. Furthermore, in conjunction with the rotating member 590 provided in the aforementioned embodiment, the first linkage 5611 and the second linkage 5612 are respectively hinged to the rotating member 590, thereby forming a hinged connection between the two.

[0644] When the second backrest support 520 rotates backward, the relative angle / position between it and the fourth base 510 and the second seat cushion 570 changes, causing the linkage structure 561 to move synchronously to transmit force to the second slider 530, thereby pulling the second slider 530 to slide downward relative to the second backrest support 520; while when the second backrest support 520 rotates forward, the linkage structure 561 returns to its original position synchronously, driving the second slider 530 to slide upward on the second backrest support 520.

[0645] And / or, in some embodiments, as shown in FIG56, the transmission structure 560 includes a connecting rope 562, one end of which is connected to the second sliding member 530, and the other end of which is connected to the fourth base 510 or the second cushion 570 of the seat.

[0646] The transmission structure 560 uses a connecting rope 562, which can be arranged along the second backrest support 520. The second backrest support 520 is provided with a guide structure, which has a guide channel. The connecting rope 562 passes through the guide channel of the guide structure, and the two ends of the connecting rope 562 are respectively connected to the second sliding member 530 and the fourth base 510 or the second seat cushion 570 of the seat.

[0647] When the second backrest support 520 rotates backward, the relative angle / position between it and the fourth base 510 or the second seat cushion 570 of the seat changes, and the connecting rope 562 gradually pulls the second slider 530 to slide downward relative to the second backrest support 520 from the initial position; while when the second backrest support 520 rotates forward, the second slider 530 slides upward relative to the second backrest support 520 to return to the initial position.

[0648] In some embodiments, as shown in FIG51, the second backrest support 520 includes a first backrest support portion 521 and a first base connection portion 522. The first backrest support portion 521 is used to support the fourth backrest 550, and the first base connection portion 522 is rotatably connected to the fourth base 510.

[0649] The second sliding member 530 is slidably disposed on the first backrest support 521.

[0650] The second backrest bracket 520 is composed of a first backrest support portion 521 and a first base connecting portion 522. The first backrest support portion 521 and the first base connecting portion 522 can be arranged at an angle, which can be a right angle or an obtuse angle. Furthermore, the first backrest support portion 521 and the first base connecting portion 522 can be integrally formed or detachably connected. The second backrest bracket 520 supports the fourth backrest 550 through its first backrest support portion 521 and is rotatably connected to the fourth base 510 through the first base connecting portion 522. As shown in Figure 53, the rotatable connection between the second backrest bracket 520 and the fourth base 510 can be configured such that the first base connecting portion 522 of the second backrest bracket 520 passes through the fourth base 510 via a hinge shaft Jz, thereby achieving a rotatable connection with the fourth base 510. Furthermore, the first base connecting part 522 of the second backrest bracket 520 may be fixedly connected to a rotating frame Xj, and the rotating frame Xj may be sleeved on the hinge shaft Jz to form a rotatable connection with the fourth base 510. Of course, this is only an example and is not restrictive.

[0651] Based on the setting position of the second headrest 540, when the second slider 530 is installed on the second backrest bracket 520, it is correspondingly slidably set on the first backrest support 521.

[0652] In related technologies, the armrests are fixed to the seat cushion. When a user sits on the seat and leans back or reclines, their center of gravity and arms will move backward as the angle of leaning back or reclining increases. This can easily cause at least part of the arm (such as the elbow) to detach from the armrest and dangle in the air, resulting in insufficient support for the arm and poor comfort for the user when using the seat.

[0653] Referring to Figures 57 to 67, which are schematic diagrams of the structure of a seat and its components in one embodiment of this application:

[0654] This application also proposes a seat, as shown in Figure 57, the seat comprising:

[0655] Fifth base 610;

[0656] The third seat cushion 620 is located on the fifth base 610;

[0657] The second armrest 630 is located on the side of the third seat cushion 620;

[0658] The third backrest support 640 is rotatably connected to the fifth base 610;

[0659] The linkage mechanism 650 is connected to the second armrest 630 and is also linked to the third backrest support 640 so that the second armrest 630 can be moved by the linkage mechanism 650 when the third backrest support 640 rotates.

[0660] In this embodiment, the fifth base 610 (also referred to as the chassis) serves as the foundation of the entire seat structure, bearing the weight of the human body and various pressures that may be generated during use, and possessing sufficient strength and stability. Furthermore, the fifth base 610 is a key component connecting the main body of the seat (such as the third seat cushion 620), and it combines various components together through specific connection methods (such as fixed connection, rotatable connection, etc.) to form a complete seat structure.

[0661] When a person sits in the chair, they sit on the third seat cushion 620, which provides support for the buttocks and thighs. The arms can rest naturally on the second armrest 630, which provides support for the arms. The third seat cushion 620 typically includes a bottom structure, a filling layer, and an outer covering layer. The bottom structure, usually made of metal or plastic, supports and secures the filling layer. The filling layer, located between the bottom structure and the outer covering layer, primarily provides support and cushioning; common filling materials include sponge, foam, and latex. The outer covering layer, typically made of fabric, leather, or artificial leather, wraps around the filling layer and bottom structure. The third seat cushion 620 may be adjustable; for example, it can be movable on the fifth base 610, allowing adjustment of its height, tilt angle, or depth to suit different sitting postures and meet the needs of various usage scenarios. Furthermore, the third seat cushion 620 can adopt a zoned design, providing different levels of support for different body parts, which helps to improve comfort. In addition, the second armrest 630 can have angle and position adjustment functions. For example, the user can adjust the outward tilt angle of the second armrest 630 by pulling it outward or inward to adjust its inward tilt angle. It can also be unlocked by pressing a button, allowing the second armrest 630 to be moved up and down to adjust its height, adapting to the user's arm position and meeting the needs of different usage scenarios. The seat typically uses two second armrests 630, with the two armrests 630 respectively located on opposite sides of the third seat cushion 620. The second armrests 630 can be located on the third seat cushion 620 or on the fifth base 610; this embodiment does not limit the location of the second armrests 630.

[0662] The third backrest support 640 can be located on the rear side of the fifth base 610 to provide support for the back and / or waist of the user in conjunction with the backrest. The third backrest support 640 can have various shapes, such as arc, S-shape, L-shape, etc., depending on actual structural requirements. To ensure sufficient support strength, the third backrest support 640 can be made of materials such as metal (e.g., steel, aluminum alloy), plastic, etc. The third backrest support 640 can be an integral part of the backrest, such as being integrated into the backrest, or as shown in Figure 57, the third backrest support 640 is connected to the backrest to support it. For example, using the front-back and side-to-side directions of the seat as a reference, the backrest is located in front of the third backrest support 640 and connected to it. As shown in Figure 57, the third backrest support 640 may include a base connecting part and a backrest support part. The backrest support part and the base connecting part are arranged at an angle, which can be a right angle or an obtuse angle. The backrest support part is used to support the backrest, and the base connecting part is rotatably connected to the fifth base 610. The rotatable connection between the third backrest support 640 and the fifth base 610 can be configured such that the base connecting part of the third backrest support 640 passes through the fifth base 610 via a hinge shaft Jz, thus achieving a rotatable connection with the fifth base 610. Further, the base connecting part of the third backrest support 640 may be detachably connected to a rotating frame, which is sleeved on the hinge shaft Jz to form a rotatable connection with the fifth base 610. Of course, this is merely an example and not a limitation. When the user sits in the chair, their back and / or lumbar region can lean back against the backrest 600. The third backrest support 640 provides support for the back and / or lumbar region. Furthermore, when switching from a seated position to a reclining / lying position, the third backrest support 640 can rotate relative to the fifth base 610 to adapt to the user's sitting posture. In this embodiment, depending on the function of the third backrest support 640, it can also be called a chair back support, a linkage support, etc., and the naming is not limited.

[0663] The linkage mechanism 650 functions to link the third backrest support 640 (which can also be considered as the backrest) with the second armrest 630. Specifically, the linkage mechanism 650 is linked to the third backrest support 640. When the third backrest support 640 rotates, the linkage mechanism 650 synchronously drives the second armrest 630 to move, causing the second armrest 630 and the third backrest support 640 to move accordingly. The movement of the second armrest 630 can be a back-and-forth movement relative to the fifth base 610, including but not limited to this.

[0664] For example, when the third backrest support 640 is subjected to a rearward external force (such as the rearward pressure exerted on the third backrest support 640 by the user leaning back / reclining, or an electric driving force), the third backrest support 640 rotates rearward, and the linkage mechanism 650 correspondingly drives the second armrest 630 to move rearward. For instance, when the user leans back / reclins, the third backrest support 640 rotates rearward and the linkage mechanism 650 simultaneously drives the second armrest 630 to move rearward, so as to automatically adjust the position to adapt to the user's sitting posture and / or position. When the third backrest support 640 is subjected to a forward external force, the third backrest support 640 rotates forward, and the linkage mechanism 650 correspondingly drives the second armrest 630 to move forward. For instance, when the user changes from leaning back / reclining to sitting upright, the third backrest support 640 rotates forward and the linkage mechanism 650 simultaneously drives the second armrest 630 to move forward, so as to automatically adjust the position to adapt to the user's sitting posture and / or position.

[0665] The linkage mechanism 650 is set on the fifth base 610, and its structural configuration can take many forms.

[0666] For example, the linkage mechanism 650 consists of the following parts:

[0667] The detection structure monitors the rotation status of the third backrest bracket 640, such as angle sensors, encoders, etc.

[0668] The drive structure provides driving power, such as a motor, based on the detection data from the detection structure.

[0669] A transmission structure, such as a gear rack, chain, or belt, transmits power from the drive structure to the second handrail 630 to enable the second handrail 630 to move.

[0670] The above are merely illustrative examples and are not restrictive. In addition, the structure of the linkage mechanism 650 may also be other, as will be described in subsequent embodiments.

[0671] In this embodiment, the seat uses a linkage mechanism 650 to enable the third backrest support 640 and the second armrest 630 to move together. When the user sits in the seat, leaning back or reclining will cause the backrest and the third backrest support 640 to rotate relative to the fifth base 610. At this time, the linkage mechanism 650 will correspondingly drive the second armrest 630 to move to follow the user's arm, always providing sufficient support for the user's arm, which helps to improve the user's comfort when using the seat.

[0672] In some embodiments, as shown in Figures 57 to 59, the linkage mechanism 650 includes:

[0673] The frame 651 is movably connected to the fifth base 610. The frame 651 is connected to the third backrest support 640 through a transmission, and can move with the third backrest support 640 when the third backrest support 640 rotates.

[0674] The second handrail 630 is installed on the frame 651.

[0675] The linkage mechanism 650 adopts a frame 651 structure. The frame 651 can be a one-piece frame 651 or a frame 651 assembled from multiple different parts or components. This embodiment does not limit this.

[0676] The frame 651 and the fifth base 610 are movably connected. The movable connection can include a rotational connection, a sliding connection, or a linkage structure. Because the frame 651 and the fifth base 610 are movably connected, the frame 651 can move relative to the fifth base 610, and the movement can include moving, rotating, etc.

[0677] The transmission connection between the frame 651 and the third backrest support 640 can be either a direct connection between them to establish a transmission relationship, or a connection between the frame 651 and the third backrest support 640 via an intermediate connector. The intermediate connector can be a support component that provides support to the third backrest support 640. Whether the frame 651 and the third backrest support 640 are directly connected or connected via an intermediate connector, the connection method can be a movable connection, including rotational connections, sliding connections, or connections via a linkage structure. Because the frame 651 and the third backrest support 640 are transmissionally connected, when the third backrest support 640 is subjected to external force and rotates, the third backrest support 640 can drive the frame 651 to move, thus transmitting power to the frame 651 and causing the frame 651 to drive the second armrest 630 in conjunction.

[0678] Depending on its functional role, the frame 651 can also be called a linkage frame, base frame, or cushion frame, etc. For example, since the frame 651 has a linkage function, it can be called a linkage frame; or, since the frame 651 is set on the fifth base 610, it can be classified as part of the structural design of the fifth base 610, and therefore can be called a base frame. Or, since the frame 651 serves as a component of the third cushion 620, by covering the cushion shell onto the frame 651 to form the third cushion 620, it can be used to support the third cushion 620, and therefore can be classified as part of the structural design of the third cushion 620, and therefore can be called a cushion frame.

[0679] As shown in Figure 57, the frame 651 has a front end and a rear end that are spaced apart along the front-back direction of the seat or along the front-back direction of the fifth base 610. The front end of the frame 651 can be movably connected to the fifth base 610, and the rear end of the frame 651 can be drivenly connected to the third backrest support 640, so that the frame 651 can move relative to the fifth base 610 along the front-back direction of the fifth base 610 under the drive of the third backrest support 640.

[0680] Since the third backrest support 640 and the fifth base 610 are rotatably connected, and by movably connecting the front end of the frame 651 to the fifth base 610 and drivingly connecting the rear end of the frame 651 to the third backrest support 640, a linkage mechanism is formed among the third backrest support 640, the fifth base 610, and the frame 651, resulting in a relatively definite kinematic relationship. Therefore, due to the existence of this linkage mechanism, the frame 651 has a defined movement trajectory and corresponding movement actions. That is, when the third backrest support 640 rotates, it synchronously drives the frame 651 to move along the defined movement trajectory and perform the corresponding movement actions.

[0681] The second armrest 630 is mounted on the frame 651 and is linked to the third backrest support 640 via the frame 651. The three components have a coordinated action mechanism. When the third backrest support 640 is rotated by an external force, the third backrest support 640 can drive the frame 651 to move, thereby transmitting power to the frame 651, which in turn causes the frame 651 to drive the second armrest 630 in conjunction.

[0682] When the user reclines / lies back and the third backrest support 640 rotates backward (e.g., counterclockwise), the transmission frame 651 of the third backrest support 640 moves backward, and the second armrest 630 on the frame 651 moves backward accordingly. This adjusts the position of the second armrest 630 as the user reclines / lies back, making it adaptable to the user's arm position. Conversely, when the user switches from reclining / lying back to sitting upright and the third backrest support 640 rotates forward (e.g., clockwise), the transmission frame 651 of the third backrest support 640 moves forward, and the second armrest 630 on the frame 651 moves forward accordingly. This adjusts the position of the second armrest 630 as the user switches from reclining / lying back to sitting upright, making it adaptable to the user's arm position.

[0683] In some embodiments, the second handrail 630 is slidably disposed on the frame 651;

[0684] The linkage mechanism 650 also includes:

[0685] The second linkage component is connected to the second armrest 630. The second linkage component is used to drive the second armrest 630 to slide on the frame 651 when the third backrest support 640 rotates.

[0686] The function of the second linkage component is to transmit power to the second armrest 630 when the third backrest support 640 rotates, causing the second armrest 630 to slide on the frame 651. That is, in addition to being mounted on the frame 651, the second armrest 630 is also connected to the third backrest support 640 via the second linkage component. Specifically, when the t...

Claims

1. A seat, comprising: First base; The first linkage bracket is rotatably connected to the first base; The first backrest is located on one side of the first linkage bracket and connected to the first linkage bracket; The first headrest is located on the top side of the first backrest; The first seat cushion is disposed on the first base; The first armrest is located on the side of the first seat cushion; When the first linkage bracket rotates relative to the first base, the first linkage bracket drives at least one of the first backrest, the first headrest, the first seat cushion, and the first armrest to move together.

2. The seat according to claim 1, wherein, The seat also includes: At least two connecting components are spaced apart on one side of the first linkage bracket along the longitudinal direction of the first linkage bracket and are connected to the first backrest via a transmission. The at least two connecting components are movably connected to the first linkage bracket, and are configured such that when the first linkage bracket rotates relative to the first base, the first backrest can move relative to the first linkage bracket.

3. The seat according to claim 2, wherein, The at least two connecting components include: The first connecting component is slidably connected to the first linkage bracket and is also drive-connected to the first backrest.

4. The seat according to claim 3, wherein, The first connection component includes: The first transmission component is slidably disposed on the first linkage bracket and is transmissionally connected to the first backrest.

5. The seat according to claim 4, wherein, The first linkage bracket is provided with a first sliding cavity extending in its longitudinal direction, and the first transmission component is inserted into the first sliding cavity and slides in cooperation with the first sliding cavity.

6. The seat according to claim 5, wherein, At least one of the first linkage bracket and the first transmission component is provided with a first sliding structure, which is configured to support the first transmission component to slide along the first sliding cavity.

7. The seat according to claim 5, wherein, A first guide post is provided on one of the outer wall of the first transmission component and the inner wall of the first sliding cavity, and a first guide groove is provided on the other. The first guide post is inserted into the first guide groove and slides in cooperation with the first guide groove to guide the first transmission component to slide along the first sliding cavity.

8. The seat according to claim 4, wherein, The first connection component further includes: The second transmission component is movably connected to the first transmission component, and the first transmission component is connected to the first backrest via the second transmission component.

9. The seat according to claim 8, wherein, The second transmission component includes: The first connecting member is rotatably connected to the first transmission component; At least two sets of second connectors are respectively disposed on opposite sides of the first connector; Each set of second connectors includes at least one second connector, each second connector is movably connected to the first connector, and the first connector is movably connected to the first backrest through at least two sets of second connectors.

10. The seat according to claim 9, wherein, One of the first backrest and the second connecting member is provided with a first receiving cavity, and the other is provided with a first mating member. The first mating member is received in the first receiving cavity so that the second connecting member is movably connected to the first backrest.

11. The seat according to claim 3, wherein, The at least two connecting components also include: The second connecting component is rotatably connected to the first linkage bracket and is also drive-connected to the first backrest.

12. The seat according to claim 11, wherein, The second connection component includes: The third transmission component is rotatably connected to the first linkage bracket and is also transmissionally connected to the first backrest.

13. The seat according to claim 12, wherein, The second connection component also includes: The fourth transmission component is movably connected to the third transmission component, and the third transmission component is connected to the first backrest via the fourth transmission component.

14. The seat according to claim 13, wherein, The fourth transmission component includes: The third connecting member is rotatably connected to the third transmission component; At least two sets of fourth connectors are respectively disposed on opposite sides of the third connector; Each set of fourth connectors includes at least one fourth connector, each fourth connector is movably connected to the third connector, and the third connector is movably connected to the first backrest through at least two sets of fourth connectors.

15. The seat according to claim 14, wherein, One of the first backrest and the fourth connecting member is provided with a second receiving cavity, and the other is provided with a second mating member. The second mating member is received in the second receiving cavity so that the fourth connecting member is movably connected to the first backrest.

16. The seat according to claim 11, wherein, The seat also includes: The first linkage component has one end connected to the first connecting component in a transmission manner, and the other end hinged to the second connecting component.

17. The seat according to claim 11, wherein, The seat also includes: The second linkage component has one end hinged to the second connecting component or the first backrest, and the other end configured to be connected to the first base or the first seat cushion.

18. The seat according to claim 3, wherein, The first connecting component is also drively connected to the first headrest and is configured to move the first headrest when the first linkage bracket rotates relative to the first base.

19. The seat according to claim 18, wherein, The first connection component includes: The first transmission component is slidably disposed on the first linkage bracket and is transmissionally connected to the first backrest; The first headrest is disposed on the first transmission component. When the first linkage bracket rotates, the first transmission component slides on the first linkage bracket to drive the first headrest to move.

20. The seat according to claim 1, wherein, The seat also includes: The first linkage frame is movably connected to the first base, and the first seat cushion is connected to the first linkage frame. The first linkage frame is also connected to the first linkage bracket for transmission, so that when the first linkage bracket rotates relative to the first base, it is driven to move relative to the first base, thereby driving the first cushion to move.

21. The seat according to claim 20, wherein, The first linkage frame has a first connecting end and a second connecting end. The first connecting end is movably connected to the first base, and the second connecting end is drively connected to the first linkage bracket.

22. The seat according to claim 21, wherein, The first connecting end is slidably connected to the first base.

23. The seat according to claim 22, wherein, One of the first connecting end and the first base is provided with a first guide groove, and the other is provided with a first sliding member. The first sliding member can slide in the first guide groove, so that the first linkage frame moves relative to the first base.

24. The seat according to claim 23, wherein, The first guide groove includes a first groove segment and a second groove segment that are connected. The first groove segment is inclined upward toward the rear side of the seat, and the second groove segment is inclined upward toward the front side of the seat.

25. The seat according to claim 21, wherein, The first linkage bracket is hinged to the second connecting end.

26. The seat according to claim 20, wherein, The first handrail is slidably mounted on the first linkage frame.

27. The seat according to claim 26, wherein, The seat also includes: A first linkage component is connected to the first handrail, and the first linkage component is used to drive the first handrail to slide on the first linkage frame when the first linkage bracket rotates.

28. The seat of claim 27, wherein, The first linkage component includes: A first linkage assembly is disposed on the first linkage frame or the first seat cushion. One end of the first linkage assembly is hinged to the first base, and the other end of the first linkage assembly is hinged to the first armrest.

29. The seat of claim 28, wherein, The first linkage assembly includes a first link, a second link, and a third link. The second link is rotatably mounted on the first linkage frame or the first seat cushion and is located between the first link and the third link. One end of the first connecting rod is hinged to the first base, the other end of the first connecting rod is hinged to one end of the second connecting rod, the other end of the second connecting rod is hinged to one end of the third connecting rod, and the other end of the third connecting rod is hinged to the first handrail.

30. The seat of claim 1, wherein, The first base is provided with a first mounting bracket; The first armrest is slidably disposed on the first base, the first seat cushion, or the first mounting bracket. The seat also includes: A first linkage component is connected to the first armrest, and the first linkage component is used to drive the first armrest to slide on the first base, the first seat cushion, or the first mounting bracket when the first linkage bracket rotates.

31. The seat of claim 27 or 30, wherein, The first linkage component includes: A first thread reel assembly, comprising a first thread reel, a second thread reel, and a first pull line, wherein the first thread reel is rotatably mounted on the first base, and the first pull line is wound around the first thread reel and the second thread reel; The first reel is connected to the first linkage bracket via a transmission, and the first handrail is fixedly connected to the first pull line and can move under the drive of the first pull line.

32. The seat of claim 26 or 30, wherein, The seat also includes: A first sliding support component is connected to the first handrail to support the sliding of the first handrail.

33. A seat back, comprising a backrest body and a support member; The backrest body is provided with a plurality of openings, which are located on the side of the backrest body along its lateral direction, and each of the openings extends from the edge of its side side toward the other side. The backrest body is also provided with two sets of support positions, which are spaced apart along the horizontal or vertical direction of the backrest body. Each set of support positions includes at least one support position, and the support member is connected to the two sets of support positions.

34. The backrest of claim 33, wherein, The plurality of openings are divided into two groups, and the two groups of openings are arranged opposite each other along the lateral direction of the backrest body. Each set of openings includes at least one opening.

35. The backrest of claim 33, wherein, The backrest body includes: Multiple support ribs are provided, which are spaced apart along the longitudinal direction of the backrest body, and the gap between any two adjacent support ribs forms the opening; The two sets of support positions are disposed on at least a portion of the plurality of support ribs.

36. The backrest of claim 33, wherein, The support member includes a first support member having two support portions disposed opposite to each other, one of the two support portions being connected to one set of support positions and the other being connected to another set of support positions.

37. The backrest of claim 36, wherein, The support portion is movably connected to the support position.

38. The backrest of claim 37, wherein, The support member further includes at least two sets of second support members, which are respectively disposed on the two support portions; Each set of second support members includes at least one second support member, each second support member is movably connected to the support portion, and each support portion is movably connected to a set of second support members thereon and a set of support positions therecorresponding to them.

39. The backrest according to claim 38, wherein, A third receiving cavity is provided at the support position, and a ball connector is provided on the second support member. The ball connector is received in the third receiving cavity so that the second support member and the support position can be movably connected.

40. A seat, comprising a seat body and a seat back as claimed in any one of claims 33 to 39, wherein the seat back is connected to the seat body.

41. A seat back assembly, comprising: Second backrest; The first backrest support is located on one side of the second backrest and is used to connect the second base of the seat. A fifth transmission component, one end of which is configured to connect to the second backrest and the other end of which is configured to connect to the first backrest support; The fifth transmission component is slidably connected to the second backrest or the first backrest bracket, so that when the second backrest is subjected to an external force, the second backrest can move relative to the first backrest bracket.

42. The backrest assembly of claim 41, wherein, The fifth transmission component includes: The third connecting end is slidably connected to the first backrest bracket; The fourth connection end is connected to the second backrest via a transmission connection.

43. The backrest assembly of claim 42, wherein, The third connecting end includes a second sliding structure, and the first backrest bracket is provided with a third sliding structure adapted to the second sliding structure. The third connecting end is slidably connected to the first backrest bracket through the cooperation of the second sliding structure and the third sliding structure.

44. The backrest assembly of claim 43, wherein, One of the second sliding structure and the third sliding structure is fitted onto the other; and / or, The third sliding structure includes a cavity constructed in the first backrest support, and the second sliding structure includes a sliding body that cooperates with the cavity, the sliding body being slidable relative to the cavity.

45. The backrest assembly of claim 41, wherein, The fifth transmission component includes: The third connection end is connected to the first backrest bracket; The fourth connecting end is slidably connected to the second backrest.

46. The backrest assembly of claim 45, wherein, The fourth connecting end is provided with a fourth sliding structure, and the second backrest is provided with a fifth sliding structure adapted to the fourth sliding structure. The fourth connecting end is slidably connected to the second backrest through the cooperation of the fourth sliding structure and the fifth sliding structure.

47. The backrest assembly of claim 42, wherein, The backrest assembly further includes a sixth transmission component disposed between the fifth transmission component and the second backrest, the sixth transmission component comprising: The fifth connecting end is connected to the second backrest via a transmission connection; The sixth connecting end is hinged to the fourth connecting end.

48. The backrest assembly of claim 47, wherein, The sixth transmission component includes: The fifth connector has a fifth connecting end located at one end of the fifth connector facing the second backrest, and the fifth transmission component is connected to the second backrest via the fifth connector.

49. The backrest assembly of claim 48, wherein, The sixth transmission component also includes: The sixth connector is movably connected at one end to the fifth connector and movably connected at the other end to the second backrest.

50. The backrest assembly of claim 49, wherein, The sixth connector and the second backrest are provided with a seventh connector, and the other is provided with a first receiving groove adapted to the seventh connector. The sixth connector is movably connected to the second backrest through the cooperation of the seventh connector and the first receiving groove.

51. The backrest assembly of claim 50, wherein, The seventh connector includes: Ball connector; or Flexible connector.

52. A seat, comprising a second base of the seat and a backrest assembly as claimed in any one of claims 41 to 51, wherein a first backrest support of the backrest assembly is connected to the second base.

53. A seat back assembly, comprising: Third backrest; The second linkage bracket is located on one side of the third backrest and is rotatably connected to the third base of the seat; A first support member, one end of which is movably connected to the third backrest, and the other end of which is rotatably connected to the second linkage bracket; The second support member has one end rotatably connected to the first support member or rotatably connected to the third backrest, and the other end of the second support member is connected to the third base.

54. The backrest assembly according to claim 53, wherein, One end of the first support member is rotatably connected to the third backrest.

55. The backrest assembly according to claim 54, wherein, The first support member is a connecting rod, one end of which is rotatably connected to the third backrest, and the other end of which is rotatably connected to the second linkage bracket.

56. The backrest assembly according to claim 54, wherein, The first support member includes a first driving member, which includes an output end and a connecting end. One of the output end and the connecting end is rotatably connected to the third backrest, and the other of the output end and the connecting end is rotatably connected to the second linkage bracket. The first driving member is used to drive at least a portion of the third backrest to approach or move away from the second linkage bracket.

57. The backrest assembly according to claim 56, wherein, The first support member further includes a mounting base connected to the connecting end of the first drive member, wherein: The mounting base is rotatably connected to the second linkage bracket; and / or The second support member is rotatably connected to the mounting base.

58. The backrest assembly according to claim 54, wherein, The third backrest and / or the second linkage bracket are provided with a first mating structure, and the first support member is provided with a second mating structure adapted to the first mating structure, wherein: the first mating structure is rotatably connected to the second mating structure; and / or One of the first mating structure and the second mating structure is a second receiving groove, and the other is a receiving element that can rotate within the second receiving groove.

59. The backrest assembly according to claim 53, wherein, The backrest assembly further includes an adapter having a first connecting portion configured to connect to the third backrest and a second connecting portion configured to connect to the first support member, wherein: The first connecting part is movably connected to the third backrest; or The second connecting part is movably connected to the first supporting member.

60. The backrest assembly according to claim 53, wherein, The backrest assembly further includes a first elastic element for connecting the first support member and the third backrest.

61. The backrest assembly according to claim 53, wherein, The backrest assembly further includes a connecting member for connecting the first support member and the second linkage bracket, wherein: One end of the connecting member is rotatably connected to the first supporting member, and the other end is pulsatorically connected to the second linkage bracket.

62. The backrest assembly according to any one of claims 54 to 59, wherein, One end of the second support member is fixedly connected to the third base, and the other end is rotatably connected to the third backrest.

63. A seat, comprising a seat body, a third base mounted on the seat body, and a backrest assembly as described in any one of claims 53 to 62 mounted on the seat body.

64. A seat, comprising: Fourth base; The second backrest bracket is rotatably connected to the fourth base and configured to connect to the fourth backrest. The second sliding member is slidably disposed on the second backrest bracket; The second headrest is disposed on the second sliding member; When the second backrest support rotates, the second slider slides on the second backrest support to drive the second headrest to move.

65. The seat according to claim 64, wherein, The second backrest support is provided with a second sliding cavity extending in its longitudinal direction, and the second sliding member is inserted into the second sliding cavity and slides in cooperation with the second sliding cavity.

66. The seat according to claim 65, wherein, At least one of the second backrest support and the second sliding member is provided with a sixth sliding structure, which is configured to support the second sliding member to slide along the second sliding cavity.

67. The seat according to claim 65, wherein, A second guide post is provided on one of the outer wall of the second sliding member and the inner wall of the second sliding cavity, and a second guide groove is provided on the other. The second guide post is inserted into the second guide groove and slides in cooperation with the second guide groove to guide the second sliding member to slide along the second sliding cavity.

68. The seat according to claim 64, wherein, The second sliding member is sleeved on the second backrest bracket and forms a sliding engagement with the second backrest bracket.

69. The seat according to claim 64, wherein, The second backrest support is provided with an arc-shaped slide rail, and the second sliding member slides in cooperation with the arc-shaped slide rail, which can drive the second headrest to move along the arc trajectory.

70. The seat according to any one of claims 64 to 69, wherein, The second headrest is rotatable.

71. The seat according to claim 70, wherein, Also includes: The second drive unit is connected to the second headrest; When the second backrest support rotates, the second drive unit drives the second headrest to rotate.

72. The seat according to any one of claims 64 to 69, wherein, Also includes: The fourth backrest is connected to the second sliding member; When the second backrest bracket rotates, the fourth backrest rotates with the second backrest bracket and causes the second sliding member to slide on the second backrest bracket.

73. The seat according to claim 72, wherein, The second sliding member is provided with a backrest connecting part, and the second sliding member is hinged to the fourth backrest through the backrest connecting part.

74. The seat according to claim 72, wherein, Also includes: A rotating component is spaced apart from the second sliding component along the longitudinal direction of the seat. One end of the rotating component is rotatably connected to the second backrest bracket, and the other end is drive-connected to the fourth backrest.

75. The seat according to any one of claims 64 to 69, wherein, Also includes: The transmission structure is connected to the second sliding member, and the transmission structure is also connected to the fourth base or The second seat cushion drive connection; When the second backrest bracket rotates, the transmission structure drives the second sliding member to slide on the second backrest bracket.

76. The seat according to claim 75, wherein, The transmission structure includes a linkage structure, one end of which is hinged to the second sliding member, and the other end of which is drively connected to the second cushion of the fourth base or seat; and / or The transmission structure includes a connecting rope, one end of which is connected to the second sliding member, and the other end of which is connected to the second cushion of the fourth base or seat.

77. The seat according to any one of claims 64 to 69, wherein, The second backrest bracket includes a first backrest support and a first base connection. The first backrest support is used to support the fourth backrest, and the first base connection is rotatably connected to the fourth base. The second sliding member is slidably disposed on the first backrest support portion.

78. A seat, comprising: The fifth base; The third cushion is provided on the fifth base; The second armrest is located on the side of the third seat cushion; The third backrest support is rotatably connected to the fifth base; A linkage mechanism is connected to the second armrest and is also linked to the third backrest support, so that the linkage mechanism drives the second armrest to move when the third backrest support rotates.

79. The seat according to claim 78, wherein, The linkage mechanism includes: The frame is movably connected to the fifth base, and the frame is drivenly connected to the third backrest bracket, and can move with the third backrest bracket when the third backrest bracket rotates. The second handrail is installed on the frame.

80. The seat according to claim 79, wherein, The second handrail is slidably disposed on the frame; The linkage mechanism also includes: The second linkage component is connected to the second armrest, and the second linkage component is used to drive the second armrest to slide on the frame when the third backrest support rotates.

81. The seat according to claim 80, wherein, The second linkage component includes: A second linkage assembly is disposed on the frame or the third seat cushion. One end of the second linkage assembly is hinged to the fifth base, and the other end of the second linkage assembly is hinged to the second armrest.

82. The seat according to claim 81, wherein, The second linkage assembly includes a fourth link, a fifth link, and a sixth link, wherein the fifth link is rotatably mounted on the frame or the third seat cushion and is located between the fourth link and the sixth link; One end of the fourth link is hinged to the fifth base, the other end of the fourth link is hinged to one end of the fifth link, the other end of the fifth link is hinged to one end of the sixth link, and the other end of the sixth link is hinged to the second handrail.

83. The seat according to claim 82, wherein, The fourth link and the fifth link are arranged at an angle. The fourth link includes a base connecting arm and a connecting rod connecting arm. The end of the base connecting arm away from the connecting rod connecting arm is hinged to the fifth base. The end of the connecting rod connecting arm away from the base connecting arm is hinged to the fifth link. The width of the connecting arm is greater than the width of the base connecting arm; and / or, the fourth connecting rod has reinforcing ribs protruding from its two opposite surfaces in the thickness direction, the reinforcing ribs being disposed on the base connecting arm and extending at least partially to the connecting arm.

84. The seat according to claim 83, wherein, The fourth link is elastically deformable; and / or, The sixth link is elastically deformable.

85. The seat according to claim 78, wherein, Also includes: The second mounting bracket is connected to the fifth base; The second armrest is slidably disposed on the fifth base, the third seat cushion, or the second mounting bracket; The linkage mechanism includes: The second linkage component is connected to the second armrest, and the second linkage component is used to drive the second armrest to slide on the fifth base, the third seat cushion, or the second mounting bracket when the third backrest support rotates.

86. The seat according to claim 80 or 85, wherein, The second linkage component includes: The second thread reel assembly includes a third thread reel, a fourth thread reel, and a second pull line. The third thread reel is rotatably mounted on the fifth base, and the second pull line is wound around the third thread reel and the fourth thread reel. The third pulley is connected to the third backrest bracket via a transmission, and the second armrest is fixedly connected to the second pull line and can move under the drive of the second pull line.

87. The seat according to claim 86, wherein, The third backrest bracket is connected to a hinge shaft, and the third backrest bracket is connected to the fifth base through the hinge shaft so as to be rotatably connected to the fifth base; The second linkage component also includes: A transmission assembly is disposed between the hinge shaft and the third thread pulley. The transmission assembly is connected to both the hinge shaft and the third thread pulley, and is used to drive the third thread pulley to rotate when the third backrest support rotates.

88. The seat according to claim 80 or 85, wherein, Also includes: The second sliding support component is connected to the second handrail to support the sliding of the second handrail.

89. The seat according to claim 80 or 85, wherein, The linkage mechanism also includes: A linkage component is disposed between the second linkage assembly and the second handrail; The second linkage component is connected to the second handrail by connecting to the linkage member, the linkage member is used to drive the second handrail to move, and the second handrail can slide relative to the linkage member; A second elastic element is provided between the linkage and the second handrail. The second elastic element acts on the second handrail and is configured to apply an elastic force to the second handrail to reset it relative to the linkage.

90. A seat, comprising: The sixth base; The second linkage frame is movably connected to the sixth base, and the second linkage frame is fixedly connected to the fourth seat cushion of the seat. The fourth backrest bracket is rotatably connected to the sixth base, and the fourth backrest bracket is also drive-connected to the second linkage frame. The fourth backrest bracket is configured as the fifth backrest for mounting the seat. When the fourth backrest bracket rotates relative to the sixth base, the fourth backrest bracket drives the second linkage frame and the fourth seat cushion to move relative to the sixth base.

91. The seat according to claim 90, wherein, The second linkage frame includes: The seventh connecting end is movably connected to the sixth base; The eighth connection end is connected to the fourth backrest bracket via a transmission connection.

92. The seat according to claim 91, wherein, The seventh connecting end is slidably connected to the sixth base.

93. The seat according to claim 92, wherein, One of the seventh connecting end and the sixth base is provided with a second guide groove, and the other is provided with a third sliding member. The third sliding member can slide in the second guide groove, so that the second linkage frame and the fourth seat cushion move relative to the sixth base.

94. The seat according to claim 93, wherein, The second guide groove includes a third groove segment and a fourth groove segment that are connected. The third groove segment is inclined upward toward the rear side of the seat, and the fourth groove segment is inclined upward toward the front side of the seat.

95. The seat according to claim 94, wherein, The inclination angle of the third groove segment relative to the vertical plane of the sixth base is greater than the inclination angle of the fourth groove segment relative to the vertical plane of the sixth base.

96. The seat according to claim 92, wherein, One of the seventh connecting end and the sixth base is provided with a third guide groove, and the other is provided with a fourth sliding member. The third guide groove extends along the front-rear direction of the sixth base, and the fourth sliding member can slide in the third guide groove, so that the second linkage frame and the fourth seat cushion move back and forth relative to the sixth base.

97. The seat according to claim 91, wherein, The seat further includes a seventh transmission component, one end of which is connected to the sixth base, and the other end of which is connected to the seventh connecting end, wherein: The seventh connecting end and the sixth base are rotatably connected to the seventh transmission component.

98. The seat according to claim 97, wherein, The seventh transmission component is inclined toward the front side of the seat along the front-rear direction of the seat.

99. The seat according to claim 91, wherein, The fourth backrest bracket is slidably connected to the eighth connecting end.

100. The seat according to claim 99, wherein, The eighth connecting end and the fourth backrest bracket are provided with a fourth guide groove on one side and a fifth sliding member adapted to the fourth guide groove on the other side. The fifth sliding member can slide in the fourth guide groove, so that the second linkage frame drives the fourth seat cushion to move relative to the sixth base.

101. The seat according to claim 100, wherein, The fourth guide groove extends along the longitudinal direction of the sixth base, causing the second linkage frame to drive the fourth seat cushion to move longitudinally relative to the sixth base.

102. The seat according to any one of claims 99 to 101, wherein, The sixth base has a blocking structure on the side facing the second linkage frame, which is used to limit the rotation angle of the second linkage frame relative to the sixth base.

103. The seat according to any one of claims 91 to 98, wherein, The seat also includes an eighth transmission component, one end of which is tractively connected to the fourth backrest support, and the other end is rotatably connected to the sixth base. The eighth transmission component is used to rotatably connect to the eighth connecting end.

104. A backrest support assembly for a seat, the backrest support assembly comprising: The fifth backrest support includes a second backrest support and a second base connection. The second backrest support is used to support the sixth backrest of the seat, and the second base connection can be rotatably connected to the seventh base of the seat. The limiting member includes a first part and a second part that is telescopic relative to the first part, one of the first part and the second part being configured to connect one of the fifth backrest support and the seventh base of the seat, and the other of the first part and the second part slidingly engaging with the other of the fifth backrest support and the seventh base of the seat. A reset element is provided on the seventh base of the seat, which can apply a force to the fifth backrest support to reset it.

105. The backrest support assembly according to claim 104, wherein, When the second part slides in conjunction with the fifth backrest bracket, the fifth backrest bracket is provided with a groove that slides in conjunction with the second part; or, When the second part slides into contact with the seventh base of the seat, the seventh base of the seat is provided with a groove that slides into contact with the second part.

106. The backrest support assembly according to claim 105, wherein, The second part is constructed with a sliding part, which is disposed in the groove and can slide along the groove.

107. The backrest support assembly according to claim 104, wherein, The limiting component is a gas spring, the first part is the cylinder of the gas spring, and the second part is the piston rod of the gas spring.

108. The backrest support assembly according to claim 107, wherein, The piston rod of the gas spring extends and retracts from one end of the cylinder, the other end of the cylinder is configured to be hinged to the seventh base of the seat, and the extended end of the piston rod of the gas spring is slidably engaged with the fifth backrest support. or, The piston rod of the gas spring extends and retracts from one end of the cylinder, the other end of the cylinder is configured to be hinged to the fifth backrest support, and the extended end of the piston rod of the gas spring slides into the seventh base of the seat.

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