Backrest assembly of seat and seat

Abstract

The utility model discloses a backrest assembly of a seat and the seat, the backrest assembly of the seat comprises a backrest support connected with a base of the seat; the backrest main body is arranged on one side of the backrest bracket; the first transmission assembly is arranged between the backrest bracket and the backrest main body, and the first transmission assembly is in transmission connection with the backrest main body; the second transmission assembly is arranged between the backrest support and the backrest body, the second transmission assembly and the first transmission assembly are arranged at intervals in the longitudinal direction of the backrest support, and the second transmission assembly is in transmission connection with the backrest body; wherein the first transmission assembly is slidably connected with the backrest support, and the second transmission assembly is rotatably connected with the backrest support, so that when the backrest assembly is subjected to external force, the backrest main body can move relative to the backrest support. The backrest assembly of the seat can improve the comfort level when a user uses the seat.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a seat backrest assembly and the seat. Background Art

[0002] Chairs are commonly seen in offices, study rooms and other places, and they can meet people's needs for sitting to work, study or rest.

[0003] A seat is usually composed of multiple parts, including a seat cushion, a backrest, armrests and a headrest. The backrest provides support for the human back, maintaining the user's sitting posture and reducing pressure on the cervical spine, back and waist.

[0004] In the related art, when the user adjusts his sitting posture, the backrest of the seat is difficult to adaptively adjust with the adjustment of the user's sitting posture, resulting in poor comfort for the user when using the seat. Utility Model Content

[0005] The main purpose of the utility model is to provide a seat back assembly, aiming to improve the comfort of the user when using the seat.

[0006] To achieve the above-mentioned object, the present invention provides a seat back assembly, which comprises:

[0007] a backrest bracket connected to the base of the seat;

[0008] A backrest body, provided on one side of the backrest bracket;

[0009] A first transmission assembly is provided between the backrest bracket and the backrest body, and the first transmission assembly is in transmission connection with the backrest body;

[0010] a second transmission assembly, provided between the backrest bracket and the backrest body and spaced apart from the first transmission assembly along the longitudinal direction of the backrest bracket, the second transmission assembly being in transmission connection with the backrest body;

[0011] The first transmission assembly is slidably connected to the backrest bracket, and the second transmission assembly is rotatably connected to the backrest bracket, so that when the backrest body is subjected to external force, the backrest body can move relative to the backrest bracket.

[0012] In some embodiments, the first transmission assembly includes:

[0013] The sliding member is slidably arranged on the backrest bracket and is transmission-connected with the backrest body.

[0014] In some embodiments, the backrest bracket is provided with a sliding cavity extending along its longitudinal direction, and the sliding member is inserted into the sliding cavity and slidably cooperates with the sliding cavity.

[0015] In some embodiments, a sliding structure is provided on at least one of the backrest bracket and the sliding member, and the sliding structure is used to support the sliding member to slide along the sliding cavity.

[0016] In some embodiments, the sliding structure includes at least one supporting member, which is rotatably disposed on one of the backrest bracket and the sliding member and forms a rolling contact with the other of the backrest bracket and the sliding member.

[0017] In some embodiments, the first transmission assembly further comprises:

[0018] The first support member is rotatably connected to the sliding member, and the sliding member is transmission-connected to the backrest body through the first support member.

[0019] In some embodiments, the first transmission assembly further comprises:

[0020] at least two groups of second support members, respectively disposed on opposite sides of the first support member;

[0021] Each group of the second support members includes at least one second support member, each of the second support members is movably connected to the first support member, and the first support member is movably connected to the backrest body through at least two groups of second support members.

[0022] In some embodiments, a first accommodating cavity is provided on one of the backrest body and the second support member, and a first matching member is provided on the other, and the first matching member is accommodated in the first accommodating cavity so that the second support member can be movably connected to the backrest body.

[0023] In some embodiments, the second transmission assembly includes:

[0024] The rotating member has one end rotatably connected to the backrest bracket and the other end transmission connected to the backrest body.

[0025] In some embodiments, the second transmission assembly further comprises:

[0026] The third support member is rotatably connected to the rotating member, and the rotating member is transmission-connected to the backrest body through the third support member.

[0027] In some embodiments, the second transmission assembly further comprises:

[0028] at least two groups of fourth support members, respectively disposed on opposite sides of the third support member;

[0029] Wherein, each group of the fourth support members includes at least one fourth support member, each of the fourth support members is movably connected to the third support member, and the third support member is movably connected to the backrest body through at least two groups of fourth support members.

[0030] In some embodiments, a second accommodating cavity is provided on one of the backrest body and the fourth support member, and a second matching member is provided on the other, and the second matching member is accommodated in the second accommodating cavity so that the fourth support member can be movably connected to the backrest body.

[0031] In some embodiments, the backrest assembly further comprises:

[0032] The first linkage member has one end hinged to the first transmission assembly and the other end hinged to the second transmission assembly.

[0033] In some embodiments, the backrest assembly further comprises:

[0034] The second linkage member has one end hinged to the second transmission assembly and the other end hinged to the base of the seat.

[0035] In some embodiments, the backrest body is provided with a plurality of openings, the plurality of openings are located on the side of the backrest body along the transverse direction thereof, and each of the openings extends from an edge of one side toward the other side.

[0036] In some embodiments, the backrest body comprises:

[0037] A plurality of supporting ribs are arranged at intervals along the longitudinal direction of the backrest body, and a gap between any two adjacent supporting ribs forms the opening.

[0038] The present invention further provides a seat, which comprises a base and a backrest assembly of the seat as described above, wherein the backrest bracket is connected to the base.

[0039] The backrest assembly of the chair of the present invention is designed with a sliding connection of the first transmission assembly and a rotating connection of the second transmission assembly, so that the backrest body can move relative to the backrest bracket. When the backrest assembly is subjected to external force (such as the force exerted on the backrest assembly by the human body leaning against the backrest assembly), the backrest body will move relative to the backrest bracket, such as following the user's back and / or waist when leaning back, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a structural diagram of a seat in one embodiment of the present invention;

[0041] Figure 2 This is a structural diagram of a portion of a backrest assembly of a seat in one embodiment of the present invention;

[0042] Figure 3 This is a structural diagram of another part of the backrest assembly of a seat in one embodiment of the present utility model;

[0043] Figure 4 This is a structural diagram of a portion of a backrest assembly of a seat in one embodiment of the present invention;

[0044] Figure 5 This is an exploded view of a portion of a backrest assembly of a seat in one embodiment of the present invention;

[0045] Figure 6 This is a structural diagram of a portion of a backrest assembly of a seat in one embodiment of the present invention;

[0046] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0047] Figure 8 This is a schematic structural diagram of the connection between the first supporting member and the second supporting member in one embodiment of the present utility model;

[0048] Figure 9 This is a structural diagram of the second supporting member in one embodiment of the present utility model;

[0049] Figure 10 Schematic diagram of the structure of the fourth support member in one embodiment of the present invention. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the schemes in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0052] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0053] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0054] As a seat for people to work, study or rest, the technology of chairs is developing in a more humane and intelligent direction, striving to provide users with a comfortable and healthy sitting experience.

[0055] Generally speaking, a seat mainly consists of a base, a seat cushion, a backrest and other structural components. The base (also known 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 has sufficient strength and stability. In addition, the base is a key component that connects the seat body (such as the backrest, seat cushion, etc.). It combines various components together through specific connection methods (such as fixed connection, rotating connection, etc.) to form a complete seat structure. Among them, the seat cushion is provided on the base, and the backrest is provided above the seat cushion and located at the rear side of the seat cushion. When a person sits on the seat, he or she sits on the seat cushion, and the seat cushion provides support for the buttocks and thighs of the person. In addition, the back and / or waist can lean on the backrest, and the backrest provides support for the back and / or waist of the person.

[0056] The present invention provides a seat back assembly 100, referring to Figure 1 , the seat back assembly 100 includes:

[0057] The backrest bracket 110 is connected to the base 200 of the seat;

[0058] The backrest body 120 is provided on one side of the backrest bracket 110;

[0059] The first transmission assembly 130 is provided between the backrest bracket 110 and the backrest body 120 , and the first transmission assembly 130 is in transmission connection with the backrest body 120 ;

[0060] The second transmission assembly 140 is provided between the backrest bracket 110 and the backrest body 120 and is spaced apart from the first transmission assembly 130 along the longitudinal direction of the backrest bracket 110 . The second transmission assembly 140 is in transmission connection with the backrest body 120 .

[0061] The first transmission assembly 130 is slidably connected to the backrest bracket 110 and the second transmission assembly 140 is rotatably connected to the backrest bracket 110 so that when the backrest assembly 100 is subjected to external force, the backrest body 120 can move relative to the backrest bracket 110.

[0062] The backrest bracket 110 can be arranged at the rear side of the base 200 and connected to the base 200 to cooperate with the backrest body 120 to provide support for the back and / or waist of the human body. The connection method between the backrest bracket 110 and the base 200 includes a fixed connection or a rotatable connection, which is not limited here. The outer structure of the backrest bracket 110 is roughly rod-shaped and extends along the longitudinal direction of the seat. Its shape can be various, such as arc, S-shape, L-shape, etc., and can be set according to actual structural requirements. In order to ensure sufficient supporting strength, the backrest bracket 110 can be made of metal (such as steel, aluminum alloy, etc.), plastic and other materials. The backrest bracket 110 is provided with a backrest support portion 111 and a base connecting portion 112. The backrest support portion 111 supports the backrest body 120, and the base connecting portion 112 is rotatably connected to the base 200. The rotational connection structure between the backrest bracket 110 and the base 200 can be configured as follows: the base connection portion 112 of the backrest bracket 110 is inserted through the base 200 via a hinge axis Jz to achieve a rotational connection with the base 200. Furthermore, the base connection portion 112 of the backrest bracket 110 can be fixedly connected to a rotating member 113, which is sleeved on the hinge axis Jz to form a rotatable connection with the base 200. This is for illustrative purposes only and is not intended to be limiting.

[0063] The backrest body 120 serves as the core support structure of the backrest assembly 100 and can be made of nylon, metal, or high-strength plastic to provide the necessary strength and rigidity to support the back and / or waist of the human body. A filling layer can be provided on the backrest body 120 and wrapped with an outer cover. The main function of the filling layer is to provide comfortable support and cushioning, and can be made of sponge, foam plastic, memory foam, etc. The outer cover protects the filling layer and provides aesthetics. It can be made of fabric, leather, artificial leather, etc. and can be selected according to actual needs without limitation.

[0064] The backrest body 120 can be a single-body structure, that is, the number of bodies is one, and the backrest body 120 is arranged corresponding to the human body part. It can provide support only for the back of the human body, or only for the waist of the human body, or it can provide support for both the back and waist of the human body. In addition, the backrest body 120 can also be a multi-body structure, with more than one body. For example, the backrest body 120 is a dual-body structure. Specifically, the backrest body 120 has a first backrest body and a second backrest body. The first backrest body and the second backrest body are arranged in sequence along the longitudinal direction of the seat. The first backrest body can provide support for the back of the human body, and the second backrest body can provide support for the waist of the human body. Alternatively, the first backrest body and the second backrest body can be arranged in sequence along the transverse direction of the seat. This is only exemplary and not restrictive.

[0065] like Figure 1 As shown, in the longitudinal direction of the backrest bracket 110, the first transmission assembly 130 and the second transmission assembly 140 are spaced apart in the upper and lower directions. The first transmission assembly 130 is slidably connected to the backrest bracket 110 and is in transmission connection with the backrest body 120. Therefore, the backrest body 120 can slide relative to the backrest bracket 110 through the first transmission assembly 130. The structural composition of the first transmission assembly 130 can be various, as long as it can support the backrest body 120 to slide relative to the backrest bracket 110. Specific examples are further described in subsequent embodiments. The second transmission assembly 140 is rotatably connected to the backrest bracket 110 and is in transmission connection with the backrest body 120. Therefore, the backrest body 120 can rotate relative to the backrest bracket 110 through the second transmission assembly 140. The structural composition of the second transmission assembly 140 can be various, as long as it can support the backrest body 120 to rotate relative to the backrest bracket 110. Specific examples are further described in subsequent embodiments. Among them, the transmission connection between the first transmission component 130, the second transmission component 140 and the backrest main body 120 can be a fixed connection, a movable connection, etc. This embodiment does not impose any restrictions on this, as long as the power transmission between the first transmission component 130, the second transmission component 140 and the backrest main body 120 can be achieved.

[0066] Among them, the backrest body 120 moves relative to the backrest bracket 110, which can specifically include: the backrest body 120 slides relative to the backrest bracket 110 through the first transmission assembly 130, and at the same time rotates relative to the backrest bracket 110 through the second transmission assembly 140 to change the angle and / or position.

[0067] When the backrest assembly 100 is subjected to an external force, the backrest body 120 moves relative to the backrest bracket 110, which can be:

[0068] When the user applies force to the backrest body 120, but the force is insufficient to allow the backrest bracket 110 to rotate relative to the base 200 or the backrest bracket 110 cannot rotate relative to the base 200, the backrest body 120 can also be moved relative to the backrest bracket 110 (with a relatively small range of movement) to achieve adaptive adjustment;

[0069] Alternatively, it can be:

[0070] The user applies force to the backrest body 120 or the backrest bracket 110, and the backrest bracket 110 can rotate relative to the base 200. The force can allow the backrest bracket 110 to rotate relative to the base 200, and the backrest body 120 is transmitted to make the backrest body 120 move relative to the backrest bracket 110 (the range of movement is relatively large) to achieve adaptive adjustment.

[0071] Specifically, when force is applied to the backrest body 120, the backrest body 120 will adaptively slide on the backrest bracket 110 via the first transmission assembly 130 and adaptively rotate via the second transmission assembly 140. Furthermore, when force is applied to the backrest body 120 or the backrest bracket 110 to cause the backrest bracket 110 to rotate, the first transmission assembly 130 and the second transmission assembly 140 will be driven to move, and the backrest body 120 will also adaptively adjust its angle and / or position.

[0072] In this embodiment, the backrest assembly 100 of the chair is designed with a sliding connection of the first transmission assembly 130 and a rotating connection of the second transmission assembly 140, so that the backrest body 120 can move relative to the backrest bracket 110. When the backrest assembly 100 is subjected to an external force (such as the force exerted on the backrest assembly 100 by the human body leaning back on the backrest assembly 100), the backrest body 120 will move relative to the backrest bracket 110, such as following the user's back and / or waist when leaning back, 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.

[0073] In some embodiments, reference Figure 1 and Figure 2The first transmission assembly 130 includes a sliding member 131 that is slidably disposed on the backrest bracket 110 and is transmission-connected to the backrest body 120. The sliding member 131 is mounted on the backrest bracket 110 and can slide on the backrest bracket 110. Specifically, the sliding member 131 can be in the form of a structure such as a slide rod, a slide cylinder, a slide seat, a slide rack, a slide rail, etc., so as to slide with the backrest bracket 110 and realize a slidable arrangement on the backrest bracket 110. On the backrest bracket 110, the sliding member 131 can be disposed on the upper part of the backrest bracket 110 to correspond to the upper half of the backrest body 120 (which can also be regarded as the part of the backrest body 120 used to support the human back). The backrest body 120 and the sliding member 131 are connected in a transmission connection relationship. Through the provided sliding member 131, the backrest body 120 can slide relative to the backrest bracket 110, and the sliding member 131 supports the sliding of the backrest body 120 on the backrest bracket 110.

[0074] The power source for the sliding of the sliding member 131 may be as follows:

[0075] First, when the user leans on the backrest body 120 and leans back, the force applied to the backrest body 120 increases. The force applied to the backrest body 120 acts synchronously on the sliding member 131 and the backrest bracket 110, so that the backrest bracket 110 rotates backward accordingly, and at the same time, the sliding member 131 slides on the backrest bracket 110, thereby supporting the backrest body 120 to slide relative to the backrest bracket 110.

[0076] Secondly, a linkage structure can be configured around the slider 131, connected between the slider 131 and the seat base or cushion. When the user directly applies force to the backrest bracket 110 or leans back against the backrest body 120, causing the backrest bracket 110 to rotate backward, the linkage structure drives the slider 131 in conjunction. Specifically, the slider 131 can be pulled to slide on the backrest bracket 110, which in turn drives the backrest body 120 to slide relative to the backrest bracket 110.

[0077] Third, the sliding member 131 is also connected to other components of the seat (such as the headrest 300). By applying force to the corresponding components, the sliding member 131 and the backrest bracket 110 are synchronously acted on, so that the backrest bracket 110 rotates backward and at the same time the sliding member 131 slides on the backrest bracket 110, thereby supporting the backrest body 120 to slide relative to the backrest bracket 110.

[0078] That is, when the backrest bracket 110 rotates relative to the base 200, the backrest body 120 slides on the backrest bracket 110 through the sliding member 131, and the sliding member 131 supports the backrest body 120 to slide on the backrest bracket 110; or, the sliding member 131 slides on the backrest bracket 110 to drive the backrest body 120 to slide relative to the backrest bracket 110.

[0079] In this embodiment, when the user sits on the chair and leans back against the backrest body 120 and reclines, the backrest body 120 and the backrest bracket 110 will rotate relative to the base 200. At the same time, the sliding member 131 slides on the backrest bracket 110 (for example, slides downward) to drive the backrest body 120 to move (for example, slides downward) to adjust the position and / or angle of the backrest body 120, so that the backrest body 120 follows the user's part (such as the back) for support, adapts to the user's posture changes, and improves the user's comfort when using the chair.

[0080] In some embodiments, reference Figure 2 and Figure 3 The backrest bracket 110 is provided with a sliding cavity Q extending along its longitudinal direction, and the sliding member 131 is inserted into the sliding cavity Q and slidably cooperates with the sliding cavity Q.

[0081] The sliding cavity Q provided on the backrest bracket 110 is adapted to the sliding member 131, and the sliding member 131 is slidably provided on the backrest bracket 110 by being inserted into the sliding cavity Q. The sliding member 131 may be a sliding rod. Optionally, the sliding cavity Q is located at the upper portion of the backrest bracket 110, and the top end of the backrest bracket 110 is configured with a cavity Qk connected to the sliding cavity Q. The cavity Qk is adapted to the outer contour of the sliding member 131, and the sliding member 131 is inserted into the sliding cavity Q through the cavity Qk. The extension length of the sliding cavity Q is not limited and can be set according to actual conditions.

[0082] When the backrest bracket 110 rotates, the slider 131 slides accordingly along the sliding cavity Q. For example, when a user sits on a chair and leans back against the backrest, the backrest bracket 110 rotates toward the rear of the chair on the base 200. At this time, the slider 131 slides downward along the sliding cavity Q of the backrest bracket 110 (the slider 131 continues to slide into the sliding cavity Q at the cavity opening Qk), driving the backrest body 120 to move downward as a whole or in part to adjust the position and / or angle of the backrest body 120. Alternatively, when the user transitions from leaning back to sitting upright, the backrest bracket 110 rotates toward the front of the chair on the base. At this time, the slider 131 slides upward along the sliding cavity Q of the backrest bracket 110 (the slider 131 slides from the sliding cavity Q toward the outside of the cavity opening Qk), driving the backrest body 120 to move upward as a whole or in part to adjust the position and / or angle of the backrest body 120.

[0083] Among them, the sliding member 131 is inserted into the sliding cavity Q constructed by the backrest bracket 110 to be slidably arranged on the backrest bracket 110, and does not occupy additional thickness space in the front and rear direction of the seat, and does not occupy additional width space in the left and right direction of the seat.

[0084] In some embodiments, a sliding structure is provided on at least one of the backrest bracket 110 and the sliding member 131 , and the sliding structure is used to support the sliding member 131 to slide along the sliding cavity Q.

[0085] The sliding member 131 slides along the sliding cavity Q with the support of a sliding structure. The sliding structure may be provided on the backrest bracket 110 , the sliding structure may be provided on the sliding member 131 , or both the backrest bracket 110 and the sliding member 131 may be provided with sliding structures.

[0086] The sliding structure can adopt a variety of structural forms. For example, the sliding structure can include a sliding groove, in which the sliding member 131 is partially accommodated, and supported by the sliding groove to slide. This is merely exemplary and not restrictive. In specific applications, when either the backrest bracket 110 or the sliding member 131 is provided with a sliding structure, the sliding structure can adopt, but is not limited to, a single structural form.

[0087] With the support of the sliding structure, the sliding member 131 can slide smoothly along the sliding cavity Q, which is beneficial to improving the operating stability of the backrest sliding system.

[0088] In some embodiments, reference Figure 3 The sliding structure includes at least one supporting member 10 , which is rotatably disposed on one of the backrest bracket 110 and the sliding member 131 and forms rolling contact with the other of the backrest bracket 110 and the sliding member 131 .

[0089] The sliding structure utilizes a support member 10, which is rotatably mounted on a target object (backrest bracket 110 or slider 131) and positioned on a wall surface of the target object, thereby contacting the target object. Alternatively, at least one support member 10 is rotatably mounted on the backrest bracket 110 and positioned on the inner wall of the sliding cavity Q, thereby forming rolling contact with the slider 131.

[0090] In which, at least one support member 10 is provided, that is, one support member 10 can be provided, or more than one support member 10 can be provided, such as two or three. When more than one support member 10 is provided, the more than one support member 10 can be arranged at intervals along the circumference, transverse direction, or longitudinal direction of the setting object. Optionally, the support member 10 can include a support wheel, the support wheel is connected to a mounting shaft, the wall surface of the setting object is configured with a mounting groove, the support wheel is at least partially accommodated in the mounting groove and is rotatably mounted on the wall surface of the setting object via the mounting shaft.

[0091] When the slider 131 slides along the sliding cavity Q, the support member 10 in contact with the slider 131 or the backrest bracket 110 rotates accordingly. That is, the support member 10 rolls along the surface of the slider 131 or the backrest bracket 110 to support the slider 131 in sliding along the sliding cavity Q. The support member 10 can greatly reduce the frictional resistance between the backrest bracket 110 and the slider 131, allowing the slider 131 to slide more easily and smoothly.

[0092] Optionally, at least one support member 10 is rotatably mounted on one of the backrest bracket 110 and the slider 131. The other support member 10 is provided with a longitudinally extending slot. The support member 10 is received in the slot and forms rolling contact with the bottom wall of the slot. The slot provides a clear trajectory for the support member 10, ensuring that the support member 10 moves in a predetermined direction and precisely guiding the sliding of the slider 131.

[0093] Optionally, support members 10 are provided on both the backrest bracket 110 and the slider 131. The support member 10 on the backrest bracket 110 is located on the inner wall of the sliding cavity Q and adjacent to the cavity opening Qk, while the support member 10 on the slider 131 is located at the bottom thereof. This structural layout ensures that the forces on the slider 131 are balanced during the sliding process, making it less likely to get stuck and ensuring smooth sliding of the slider 131.

[0094] In some embodiments, reference Figure 1 、 Figure 4 and Figure 5 , the first transmission assembly 130 further includes:

[0095] The first support member 132 is rotatably connected to the sliding member 131 , and the sliding member 131 is transmission-connected to the backrest body 120 via the first support member 132 .

[0096] The first support member 132 is disposed between the sliding member 131 and the backrest body 120. In addition to supporting the backrest body 120, the first support member 132 also establishes a transmission connection between the sliding member 131 and the backrest body 120. Force can be transmitted between the sliding member 131 and the backrest body 120 via the first support member 132. For example, when the sliding member 131 slides on the backrest bracket 110, the backrest body 120 is correspondingly driven to slide relative to the backrest bracket 110 via the first support member 132.

[0097] Among them, the first support member 132 and the sliding member 131 are rotatably connected, and the two form a mutually rotatable connection relationship. In addition, the first support member 132 is connected to the backrest body 120, and the connection form can be directly connected or connected through an intermediate member, and can be connected in a manner such as a rotation connection or a sliding connection. The symmetry of this embodiment is not limited. When the user leans on the backrest body 120, the backrest body 120 is affected by the force applied by the user. When the user's posture changes, the force (such as the magnitude, direction, position, etc. of the force) on the backrest body 120 changes accordingly and is transmitted to the first support member 132, so that the first support member 132 drives the backrest body 120 to rotate relative to the sliding member 131. The backrest body 120 adaptively adjusts its angle and / or position to fit closely with the human body and provide support for it. It has good fit and support, which helps to improve the comfort of the user when using the seat.

[0098] The connection structure between the first support member 132 and the sliding member 131 can be in the following two forms:

[0099] First, the sliding member 131 is constructed with a backrest connecting portion, on which a connecting shaft is passed, and the first support member 132 is connected to the connecting shaft to form a hinged (i.e., rotating connection) relationship with the backrest connecting portion, so that the first support member 132 can rotate relative to the sliding member 131 through the connecting shaft.

[0100] Secondly, the sliding member 131 is configured with a backrest connection portion, which is configured with a sliding hole, through which a sliding shaft is passed. The first support member 132 is connected to the sliding shaft or integrally formed to form a rotational connection and a sliding connection relationship with the backrest connection portion. The first support member 132 can rotate relative to the sliding member 131 via the sliding shaft, and can also slide relative to the sliding member 131. In this way, when the backrest body 120 moves relative to the sliding member 131, the position and / or angle of the backrest body 120 changes in various ways, which can make the backrest body 120 more closely fit the human body and provide sufficient support. The above two structural settings are only exemplary and not restrictive, including but not limited to these.

[0101] Optionally, the first support member 132 has two supporting portions arranged opposite to each other, and the two supporting portions are respectively located on opposite sides of the first support member 132 and are respectively connected to the backrest body 120. The two supporting portions are on opposite sides of the first support member 132, and can be extended in a direction perpendicular to the first support member 132. The first support member 132 is combined with the two supporting portions arranged thereon to form an "H"-shaped component. In addition, the supporting portion can also be non-extended, such as in a square, circular or triangular structural shape. The supporting portion can be directly connected to the backrest body 120, or can be connected to the backrest body 120 through other intermediate components.

[0102] Optionally, the support portion and the backrest body 120 are movably connected. The movably connected forms include rotational connection, sliding connection, elastic connection, etc., which are not limited in this embodiment. Because the support portion and the backrest body 120 are movably connected, the backrest body 120 is allowed to move relative to the first support member 132 to adjust to different user body shapes and / or postures, adapting to the body shape and posture of the human body, and providing support and cushioning.

[0103] In some embodiments, reference Figures 4 to 8 , the first transmission assembly 130 further includes:

[0104] At least two sets of second support members 133 are respectively disposed on opposite sides of the first support member 132;

[0105] Each group of second support members 133 includes at least one second support member 133 , each second support member 133 is movably connected to the first support member 132 , and the first support member 132 is movably connected to the backrest body 120 through at least two groups of second support members 133 .

[0106] Specifically, in addition to the sliding member 131 and the first support member 132, the first transmission assembly 130 further includes at least two sets of second support members 133 disposed on opposite sides of the first support member 132. The second support members 133 are located between the first support member 132 and the backrest body 120 and are movably connected to the first support member 132 and the backrest body 120. The form of the movably connected connection can refer to either of the two forms of the structural arrangement of the connection between the first support member 132 and the sliding member 131 in the aforementioned embodiment, including but not limited to these.

[0107] Among them, such as Figure 8 and Figure 9 As shown, the structural setting of the connection between the second support member 133 and the first support member 132 can be:

[0108] A first slide 1321 is constructed on the first support member 132, and a first slide column 1331 is passed through the first slide 1321. The second support member 133 is connected to the first slide column 1331 or is integrally formed to form a rotational connection and a sliding connection relationship with the first support member 132. Therefore, the second support member 133 can rotate relative to the first support member 132 through the first slide column 1331, and can also slide relative to the first support member 132. In this way, when the backrest body 120 moves relative to the first support member 132, the position and / or angle of the backrest body 120 changes in various ways, which can make the backrest body 120 fit the human body more closely and provide sufficient support.

[0109] One or more second support members 133 may be provided on each of the two opposing sides of the first support member 132, and each second support member 133 is movably connected to the backrest body 120. The movably connected second support members 133 between the first support member 132 and the backrest body 120 allows for more flexible relative movement between the backrest body 120 and the first support member 132, allowing the backrest body 120 to better conform to the curves of the human body and provide more comfortable support.

[0110] In some embodiments, reference Figures 5 to 9 A first accommodating cavity Q1 is provided on one of the backrest body 120 and the second support member 133, and a first matching member J1 is provided on the other. The first matching member J1 is accommodated in the first accommodating cavity Q1 so that the second support member 133 and the backrest body 120 can be movably connected.

[0111] Specifically, the backrest body 120 may be provided with a first accommodating cavity Q1, the second support member 133 may be provided with a first matching member J1, and the second support member 133 may be accommodated in the first accommodating cavity Q1 on the backrest body 120 through the first matching member J1 thereon to form a movable connection with the backrest body 120; or, the second support member 133 may be provided with a first accommodating cavity Q1, the backrest body 120 may be provided with a first matching member J1, and the backrest body 120 may be accommodated in the first accommodating cavity Q1 on the second support member 133 through the first matching member J1 thereon to form a movable connection with the second support member 133.

[0112] The first mating member J1 may be a ball connector, an elastic member (such as a spring), or a flexible silicone member, and this embodiment is not limited thereto. When the first mating member J1 is a ball connector, the ball connector end of the ball connector is received in the first accommodating cavity Q1 and can move and / or rotate within the first accommodating cavity Q1.

[0113] The movable connection between the first mating member J1 and the backrest body 120 allows the backrest body 120 to rotate and / or move in multiple directions relative to the second support member 133, which can overcome the limitations of traditional fixed connections and enable the backrest body 120 to be adaptively adjusted according to the user's posture.

[0114] For example, if the first engaging member J1 is a ball connector, when a user leans against the backrest body 120, the first engaging member J1 can move within the first accommodating cavity Q1. Changes in the user's reclining / leaning posture cause the first engaging member J1 to move and / or rotate within the first accommodating cavity Q1, causing the backrest body 120 to correspondingly adjust its angle and / or position relative to the second support member 133. This allows the backrest body 120 to adapt to the user's body curve when reclining / leaning back, improving support comfort.

[0115] In some embodiments, reference Figure 1 and Figure 2 The second transmission assembly 140 includes a rotating member 141, one end of which is rotatably connected to the backrest bracket 110 and the other end of which is transmission-connected to the backrest body 120. The rotating member 141 is mounted on the backrest bracket 110 and can rotate on the backrest bracket 110. Specifically, the rotating member 141 can adopt a structural form such as a rotating rod, a rotating frame, a connecting rod, etc. to be rotationally connected to the backrest bracket 110 to achieve a rotatable arrangement on the backrest bracket 110. On the backrest bracket 110, the rotating member 141 can be set at the lower part of the backrest bracket 110 to correspond to the lower half of the backrest body 120 (which can also be regarded as the part of the backrest used to support the human waist). The backrest body 120 and the rotating member 141 are connected in a transmission connection relationship. Through the rotating member 141, the backrest body 120 can rotate relative to the backrest bracket 110, and the rotating member 141 supports the rotation of the backrest body 120 on the backrest bracket 110.

[0116] The power source for the rotation of the rotating member 141 may be as follows:

[0117] The user leans against the backrest body 120. When the user leans back, the force applied to the backrest body 120 increases. The force applied to the backrest body 120 acts synchronously on the rotating member 141 and the backrest bracket 110, so that the backrest bracket 110 rotates backward accordingly, and at the same time, the rotating member 141 rotates on the backrest bracket 110, thereby supporting the backrest body 120 to rotate relative to the backrest bracket 110.

[0118] That is, when the backrest bracket 110 rotates relative to the base, the backrest body 120 rotates on the backrest bracket 110 via the rotating member 141 .

[0119] In this embodiment, when the user sits on the chair and leans back against the backrest body 120, the backrest body 120 and the backrest bracket 110 will rotate relative to the base 200. At the same time, the rotating member 141 rotates on the backrest bracket 110 (for example, the end connected to the rotating member 141 and the backrest body 120 rotates downward) to drive the backrest body 120 to move (for example, move toward the base) to adjust the position and / or angle of the backrest body 120, so that the backrest body 120 follows the user's part (such as the back) for support, adapts to the user's posture changes, and improves the user's comfort when using the chair.

[0120] In some embodiments, reference Figures 4 to 7 , the second transmission assembly 140 further includes:

[0121] The third support member 142 is rotatably connected to the rotating member 141 , and the rotating member 141 is transmission-connected to the backrest body 120 via the third support member 142 .

[0122] The third support member 142 is disposed between the rotating member 141 and the backrest body 120. In addition to supporting the backrest body 120, the third support member 142 also establishes a transmission connection between the rotating member 141 and the backrest body 120. Force can be transmitted between the rotating member 141 and the backrest body 120 via the third support member 142. For example, when the rotating member 141 rotates on the backrest bracket 110, the backrest body 120 is correspondingly driven to rotate relative to the backrest bracket 110 via the third support member 142.

[0123] The third support member 142 is rotatably connected to the rotating member 141, and the two are connected in a mutually rotatable relationship. In addition, the third support member 142 is connected to the backrest body 120, and the connection form can be directly connected or connected through an intermediate member. The connection method can be a rotation connection, a sliding connection, etc., which is not limited in this embodiment. When the user leans on the backrest body 120, the backrest body 120 is affected by the force applied by the user. When the user's posture changes, the force (such as the magnitude, direction, position, etc.) of the backrest body 120 changes accordingly and is transmitted to the third support member 142, so that the third support member 142 drives the backrest body 120 to rotate relative to the rotating member 141. The backrest body 120 adaptively adjusts its angle and / or position to fit closely with the human body and provide support for it. The good fit and support help improve the comfort of the user when using the seat.

[0124] The structural arrangement of the connection between the third support member 142 and the rotating member 141 can be in the following two forms:

[0125] First, the rotating member 141 is constructed with a backrest connecting portion, on which a connecting shaft is passed, and the third support member 142 is connected to the connecting shaft to form a hinged (i.e., rotating connection) relationship with the backrest connecting portion, so that the third support member 142 can rotate relative to the rotating member 141 through the connecting shaft.

[0126] Secondly, the rotating member 141 is configured with a backrest connection portion, which is configured with a sliding hole, through which a sliding shaft is passed. The third support member 142 is connected to the sliding shaft to form a hinged (i.e., rotating connection) and a sliding connection relationship with the backrest connection portion. The third support member 142 can rotate relative to the rotating member 141 via the sliding shaft, and can also slide relative to the rotating member 141. In this way, when the backrest body 120 moves relative to the third support member 142, the position and / or angle of the backrest body 120 changes in various ways, which can make the backrest body 120 more closely fit the human body and provide sufficient support. The above two structural arrangements are merely exemplary and not restrictive, and include but are not limited to these.

[0127] Here, taking the first support member 132 as a reference object, the third support member 142 may also be provided with a corresponding support portion. The specific structural arrangement refers to the above embodiment and will not be elaborated herein.

[0128] In some embodiments, reference Figure 4 , the second transmission assembly 140 further includes:

[0129] At least two sets of fourth support members 143 are respectively disposed on opposite sides of the third support member 142;

[0130] Each group of fourth support members 143 includes at least one fourth support member 143 , each fourth support member 143 is movably connected to the third support member 142 , and the third support member 142 is movably connected to the backrest body 120 through at least two groups of fourth support members 143 .

[0131] Specifically, in addition to the rotating member 141 and the third support member 142, the second transmission assembly 140 further includes at least two sets of fourth support members 143 disposed on opposite sides of the third support member 142. The fourth support members 143 are located between the third support member 142 and the backrest body 120 and are movably connected to the third support member 142 and the backrest body 120. The form of the movably connected connection can refer to either of the two forms of the structural arrangement of the connection between the third support member 142 and the rotating member 141 in the aforementioned embodiment, including but not limited to these.

[0132] The structural setting of the connection between the fourth support member 143 and the third support member 142 can be:

[0133] A second slide is constructed on the third support member 142, and a second slide column is passed through the second slide. The fourth support member 143 is connected to the second slide column or is integrally formed with the third support member 142 to form a rotational connection and a sliding connection relationship with the third support member 142. Therefore, the fourth support member 143 can rotate relative to the third support member 142 through the second slide column, and can also slide relative to the third support member 142. In this way, when the backrest body 120 moves relative to the third support member 142, the position and / or angle of the backrest body 120 changes in various ways, which can make the backrest body 120 fit the human body more closely and provide sufficient support.

[0134] One or more fourth support members 143 may be provided on each of the two opposing sides of the third support member 142, and each fourth support member 143 is movably connected to the backrest body 120. The movably connected fourth support members 143 between the third support member 142 and the backrest body 120 allows for more flexible relative movement between the backrest body 120 and the third support member 142, allowing the backrest body 120 to better conform to the curves of the human body and provide more comfortable support.

[0135] In some embodiments, reference Figure 6 、 Figure 7 and Figure 10 A second accommodating cavity Q2 is provided on one of the backrest body 120 and the fourth support member 143, and a second matching member J2 is provided on the other. The second matching member J2 is accommodated in the second accommodating cavity Q2 so that the fourth support member 143 and the backrest body 120 can be movably connected.

[0136] Specifically, the backrest body 120 may be provided with a second accommodating cavity Q2, the fourth support member 143 may be provided with a second fitting member J2, and the fourth support member 143 may be accommodated in the second accommodating cavity Q2 on the backrest body 120 through the second fitting member J2 thereon to form a movable connection with the backrest body 120; or, the fourth support member 143 may be provided with a second accommodating cavity Q2, the backrest body 120 may be provided with a second fitting member J2, and the backrest body 120 may be accommodated in the second accommodating cavity Q2 on the fourth support member 143 through the second fitting member J2 thereon to form a movable connection with the fourth support member 143.

[0137] The second mating member J2 may be a ball connector, an elastic member (e.g., a spring), or a flexible silicone rubber, etc., and this embodiment is not limited thereto. When the second mating member J2 is a ball connector, the ball connector end of the ball connector is received in the second accommodating cavity Q2 and can move and / or rotate within the second accommodating cavity Q2.

[0138] The movable connection between the second mating part J2 and the backrest body 120 allows the backrest body 120 to rotate and / or move in multiple directions relative to the fourth support part 143, which can overcome the limitations of traditional fixed connections and enable the backrest body 120 to be adaptively adjusted according to the user's posture.

[0139] For example, if the second engaging member J2 is a ball connector, when the user leans against the backrest body 120, the second engaging member J2 can move within the second accommodating cavity Q2. Changes in the user's reclining / leaning posture cause the second engaging member J2 to move and / or rotate within the second accommodating cavity Q2, causing the backrest body 120 to correspondingly adjust its angle and / or position relative to the fourth support member 143. This allows the backrest body 120 to adapt to the user's body curve when reclining / leaning, improving support comfort.

[0140] In some embodiments, reference Figure 2 The backrest assembly 100 further includes a first linkage member 151, one end of which is hinged to the first transmission assembly 130 and the other end of which is hinged to the second transmission assembly 140. In this embodiment, the first linkage member 151 forms a stable linkage relationship between the first transmission assembly 130 and the second transmission assembly 140, that is, the second transmission assembly 140, the first linkage member 151 and the first transmission assembly 130 have a mutually coordinated action mechanism. For example, when the backrest bracket 110 rotates relative to the base or the backrest body 120 moves relative to the backrest bracket 110 to drive the second transmission assembly 140 to move, the second transmission assembly 140 drives the first transmission assembly 130 to move through the first linkage member 151.

[0141] In combination with the above embodiment, based on the structural composition adopted by the first transmission assembly 130 and the second transmission assembly 140, optionally, one end of the first linkage member 151 is hinged to the sliding member 131, and the other end of the first linkage member 151 is hinged to the rotating member 141. The first linkage member 151 can be a first linkage rod 151. Taking this as an example, when the user leans back against the backrest body 120, the backrest bracket 110 rotates toward the rear of the seat, the rotating member 141 rotates accordingly and drives the first linkage rod 151 to move, and the sliding member 131 is pulled downward from the initial position through the first linkage rod 151; when the user switches from reclining to sitting upright, the backrest bracket 110 rotates toward the front of the seat, the rotating member 141 rotates accordingly and drives the first linkage rod 151 to move, and the sliding member 131 is driven upward and reset to the initial position through the first linkage rod 151.

[0142] In some embodiments, reference Figure 1 and Figure 2The backrest assembly 100 further includes a second linkage member 152, one end of which is hingedly connected to the second transmission assembly 140 and the other end of which is hingedly connected to the seat base 200. In this embodiment, since the second transmission assembly 140 is movably connected to the backrest body 120 and the backrest bracket 110, the backrest body 120, the second transmission assembly 140, and the backrest bracket 110 form a free mechanism. By further providing the second linkage member 152 as a support base for the second transmission assembly 140 or the backrest body 120, when the backrest body 120 and / or the backrest bracket 110 are not subjected to external forces, the second transmission assembly 140 or the backrest body 120 can maintain a stable state relative to the base 200, thereby ensuring that the backrest body 120, the second transmission assembly 140, the backrest bracket 110, and the second linkage member 152 form a stable linkage mechanism. Furthermore, the second linkage member 152 also forms a linkage relationship with the second transmission assembly 140, and the second linkage member 152 and the second transmission assembly 140 have a mutually coordinated action mechanism. When the backrest bracket 110 rotates relative to the base 200 or the backrest body 120 moves relative to the backrest bracket 110, driving the second transmission assembly 140 to move, the second transmission assembly 140 can move relative to the base 200 through the second linkage 152. During this process, the second linkage 152 moves accordingly and plays a role in supporting the second transmission assembly 140 and then supporting the backrest body 120.

[0143] In combination with the above embodiment, based on the structural composition of the second transmission assembly 140, optionally, one end of the second linkage member 152 is hinged to the rotating member 141, and the other end of the second linkage member 152 is hinged to the base 200. The second linkage member 152 can be a second linkage rod 152.

[0144] In some embodiments, reference Figure 6 and Figure 7 , the backrest body 120 is provided with a plurality of openings K, and the plurality of openings K are located on the side of the backrest body 120 along its transverse direction, and each opening K extends from the edge of the side where it is located toward the direction of the other side. Specifically, in the transverse direction of the backrest body 120 (which can also be regarded as the left-right direction of the backrest body 120), the opening K is located on the side of the backrest body 120 and extends toward the direction of the other opposite side. Optionally, the opening K is a strip-shaped opening. There are multiple openings K, that is, two or more openings K can be provided, and the specific number can be set according to actual needs, and the extension lengths of each opening K can be the same or different, and this embodiment does not impose any restrictions on this. As an example, the left side of the backrest body 120 has at least one first opening, and the first opening extends toward the right side; and / or, the right side of the backrest body 120 has at least one second opening, and the second opening extends toward the left side.

[0145] The plurality of openings K are divided into two groups. The two groups of openings K are arranged opposite to each other along the transverse direction of the backrest body 120 . Each group of openings K includes at least one opening K.

[0146] For ease of understanding, the two groups of openings K can be divided into a group of first openings and a group of second openings. In the horizontal direction of the backrest body 120, a group of first openings is located on the left side of the backrest body 120, and a group of second openings is located on the right side of the backrest body 120. The first openings and the second openings are arranged opposite to each other.

[0147] A group of first openings may include one first opening or multiple (two or more) first openings. When there are multiple first openings, the multiple first openings are sequentially spaced apart along the longitudinal direction of the backrest body 120. For example, seven first openings are sequentially spaced apart along the longitudinal direction of the backrest body 120 on the left side of the backrest body 120.

[0148] A group of second openings may include one second opening or multiple (two or more) second openings. When there are multiple second openings, the multiple second openings are sequentially spaced apart along the longitudinal direction of the backrest body 120. For example, seven second openings are sequentially spaced apart along the longitudinal direction of the backrest body 120 on the right side of the backrest body 120.

[0149] Optionally, the number of the first openings and the second openings are the same and their positions correspond to each other.

[0150] Due to the existence of the opening K, when the user leans on the backrest body 120, the backrest body 120 can adaptively deform according to the user's body curve to fit the user's body parts and provide sufficient support, adapting to different users' body shapes or sitting posture changes, etc.

[0151] In some embodiments, reference Figure 6 and Figure 7 The backrest body 120 includes: a plurality of support ribs 121, the plurality of support ribs 121 are arranged at intervals along the longitudinal direction of the backrest body 120, and the gap between any two adjacent support ribs 121 forms an opening K.

[0152] The support ribs 121 are generally strip-shaped or plate-shaped and can be used as a separate component or designed as an integrated part with other structures. There are multiple (two or more) support ribs 121, and the multiple support ribs 121 are arranged in sequence and spaced apart in the longitudinal direction of the backrest body 120. The number of support ribs 121 can be set according to actual needs, such as eight, and this embodiment does not limit this. In addition, in the transverse direction of the backrest body 120, the support ribs 121 can be set on one side, for example, multiple support ribs 121 are set on the left side or right side of the backrest body 120; or, the support ribs 121 can also be set on both sides, for example, multiple support ribs 121 are set on the left side and right side of the backrest body 120. Since the shapes and sizes (such as length, width, etc.) of the support ribs 121 are different, they can better fit the user's body parts and provide personalized support for users of different body types.

[0153] Because the support ribs 121 are spaced apart, the gap between any two adjacent support ribs 121 can be formed into an opening K. The size of the opening K can be determined by setting the spacing between the support ribs 121. The support ribs 121 can be connected, i.e., structurally connected, or not. When the support ribs 121 are not connected, they can be structurally connected by connecting to the transmission assembly (the first transmission assembly 130 and / or the second transmission assembly 140). This embodiment does not impose any restrictions on this.

[0154] As an example, any two adjacent support ribs 121 are connected by a connecting portion 122. Specifically, a connecting portion 122 is constructed between two adjacent support ribs 121, and the connecting portion 122 can be integrally formed with the support rib 121 so that a connection is formed between the two adjacent support ribs 121. The connected support ribs 121 form an integral backrest body 120 frame, thereby improving the structural strength and support of the backrest body 120. Moreover, the connection between the support ribs 121 through the connecting portion 122 enables the pressure to be more evenly distributed throughout the entire backrest body 120. Between two adjacent support ribs 121, the connecting portion 122 can be one or multiple (two or more), and the multiple connecting portions 122 are spaced apart along the transverse direction of the backrest body 120. This is not limited in this embodiment.

[0155] When the user leans on the backrest body 120, if the leaning posture changes, due to the rib structure design with intervals adopted by the backrest body 120, the backrest body 120 will adaptively deform with good deformation effect, providing the user with better flexible support effect.

[0156] The present invention also provides a chair comprising a base 200 and a backrest assembly 100 as described in the aforementioned embodiments. A backrest bracket 110 is connected to the base 200. The backrest bracket 110 and the base 200 may be connected in a fixed or rotatable manner. The specific structure of the backrest assembly 100 of the chair is similar to that of the aforementioned embodiments. Since the present chair utilizes all the technical solutions of all the aforementioned embodiments, it possesses at least all the technical effects provided by the technical solutions of the aforementioned embodiments, and therefore will not be further elaborated here.

[0157] The above description is only part or preferred embodiments of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A seat back assembly, characterized in that: include: a backrest bracket connected to the base of the seat; A backrest body, provided on one side of the backrest bracket; A first transmission assembly is provided between the backrest bracket and the backrest body, and the first transmission assembly is in transmission connection with the backrest body; a second transmission assembly, provided between the backrest bracket and the backrest body and spaced apart from the first transmission assembly along the longitudinal direction of the backrest bracket, the second transmission assembly being in transmission connection with the backrest body; The first transmission assembly is slidably connected to the backrest bracket, and the second transmission assembly is rotatably connected to the backrest bracket, so that when the backrest assembly is subjected to external force, the backrest body can move relative to the backrest bracket.

2. The seat back assembly according to claim 1, characterized in that: The first transmission assembly includes: The sliding member is slidably arranged on the backrest bracket and is transmission-connected with the backrest body.

3. The seat back assembly according to claim 2, characterized in that: The backrest bracket is provided with a sliding cavity extending along the longitudinal direction thereof, and the sliding member is inserted into the sliding cavity and slidably matched with the sliding cavity.

4. The seat back assembly according to claim 3, characterized in that: A sliding structure is provided on at least one of the backrest bracket and the sliding member, and the sliding structure is used to support the sliding member to slide along the sliding cavity.

5. The seat back assembly according to claim 4, characterized in that: The sliding structure includes at least one supporting member that is rotatably disposed on one of the backrest bracket and the sliding member and forms rolling contact with the other of the backrest bracket and the sliding member.

6. The seat back assembly according to any one of claims 2 to 5, characterized in that: The first transmission assembly further includes: The first support member is rotatably connected to the sliding member, and the sliding member is transmission-connected to the backrest body through the first support member.

7. The seat back assembly according to claim 6, characterized in that: The first transmission assembly further includes: at least two groups of second support members, respectively disposed on opposite sides of the first support member; Each group of the second support members includes at least one second support member, each of the second support members is movably connected to the first support member, and the first support member is movably connected to the backrest body through at least two groups of second support members.

8. The seat back assembly according to claim 7, characterized in that: One of the backrest body and the second support member is provided with a first accommodating cavity, and the other is provided with a first matching member. The first matching member is accommodated in the first accommodating cavity so that the second support member is movably connected to the backrest body.

9. The seat back assembly according to claim 1, wherein: The second transmission assembly includes: The rotating member has one end rotatably connected to the backrest bracket and the other end transmission connected to the backrest body.

10. The seat back assembly according to claim 9, characterized in that: The second transmission assembly further includes: The third support member is rotatably connected to the rotating member, and the rotating member is transmission-connected to the backrest body through the third support member.

11. The seat back assembly according to claim 10, characterized in that: The second transmission assembly further includes: at least two groups of fourth support members, respectively disposed on opposite sides of the third support member; Wherein, each group of the fourth support members includes at least one fourth support member, each of the fourth support members is movably connected to the third support member, and the third support member is movably connected to the backrest body through at least two groups of fourth support members.

12. The seat back assembly according to claim 11, wherein: A second accommodating cavity is provided on one of the backrest body and the fourth support member, and a second matching member is provided on the other. The second matching member is accommodated in the second accommodating cavity so that the fourth support member is movably connected to the backrest body.

13. The seat back assembly according to claim 1, wherein: Also includes: The first linkage member has one end hinged to the first transmission assembly and the other end hinged to the second transmission assembly.

14. The seat back assembly according to claim 1, wherein: Also includes: The second linkage member has one end hinged to the second transmission assembly and the other end hinged to the base of the seat.

15. The seat back assembly according to claim 1, wherein: The backrest body is provided with a plurality of openings, and the plurality of openings are located on the side of the backrest body along the transverse direction thereof, and each of the openings extends from the edge of one side thereof toward the other side.

16. The seat back assembly according to claim 15, characterized in that: The backrest body comprises: A plurality of supporting ribs are arranged at intervals along the longitudinal direction of the backrest body, and a gap between any two adjacent supporting ribs forms the opening.

17. A seat, characterized in that: The invention comprises a base and a backrest assembly of a chair according to any one of claims 1 to 16, wherein the backrest bracket is connected to the base.

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