Backrest assembly and seat

Abstract

The utility model discloses a backrest assembly and seat, backrest assembly includes back pole, and the lower extreme of back pole is suitable for and base rotary connection, backrest structure is located back pole's front side, is equipped with first sliding slot on back pole, and first sliding slot extends along up and down direction, and backrest structure is equipped with first connecting shaft, and first connecting shaft rotatably is located in first sliding slot and can slide along the length direction of first sliding slot, connecting rod structure, and connecting rod structure is rotatably connected with back pole, backrest structure and base, is used for driving backrest structure to slide down along back pole when the upper end of back pole rotates downward and rearward. According to the backrest assembly of the utility model, can make backrest structure when user adjusts the posture self -adaptation adjustment position, can adapt the change of human body posture, better carries out self -adaptation support to user.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, and in particular to a backrest assembly and a seat. Background Technology

[0002] In the field of seat design and manufacturing, the lumbar and back support systems are core elements affecting user comfort and are widely used in various seat products such as office chairs, gaming chairs, and child seats. As people's demands for seat experience continue to rise, existing seat backs are no longer sufficient to meet user needs. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a backrest assembly that allows the backrest structure to adaptively adjust its position when the user adjusts their posture, thus adapting to changes in human posture and providing better adaptive support for the user.

[0004] This utility model also proposes a seat, which includes the aforementioned backrest assembly.

[0005] A backrest assembly according to an embodiment of the present invention is used for a seat, the seat including a base, the backrest assembly including: a backrest rod, the lower end of the backrest rod being adapted to be rotatably connected to the base; a backrest structure, the backrest structure being disposed on the front side of the backrest rod, the backrest rod having a first sliding groove extending in a vertical direction, the backrest structure having a first connecting shaft rotatably disposed within the first sliding groove and slidable along the length direction of the first sliding groove; and a connecting rod structure, the connecting rod structure being rotatably connected to the backrest rod, the backrest structure and the base, for driving the backrest structure to slide downward along the backrest rod when the upper end of the backrest rod rotates downward and backward.

[0006] According to the backrest assembly of this utility model embodiment, by rotatably connecting the lower end of the backrest rod to the base, the rotation angle of the backrest rod relative to the base can be adjusted to meet the needs of users in different postures. In addition, a backrest structure is provided on the front side of the backrest rod. The backrest structure is slidable along the length direction of the first slide groove via a first connecting shaft. A connecting rod structure is rotatably connected to the backrest structure, the backrest rod, and the base. The connecting rod structure can drive the backrest structure to slide downward along the first slide groove when the upper end of the backrest rod rotates downward and backward, and drive the backrest structure to slide upward along the first slide groove when the upper end of the backrest rod rotates upward and forward. This allows the backrest structure to adaptively adjust its position when the user adjusts their posture, adapting to changes in human posture and providing better adaptive support for the user.

[0007] In some embodiments of this utility model, the linkage structure includes: a first connector, one end of which is rotatably connected to the backrest; a second connector, one end of which is rotatably connected to the other end of the first connector, the other end of which is rotatably connected to the backrest, the first connector being rotatably connected to the base, and the rotation axes of the first connector and the base being spaced apart from the two ends of the length direction of the first connector.

[0008] In some embodiments of this utility model, the linkage structure further includes: a third connecting member, wherein the first connecting member is rotatably connected to the base via the third connecting member, one end of the third connecting member is rotatably connected to the first connecting member and is spaced apart from both ends of the first connecting member in the length direction, and the other end of the third connecting member is rotatably connected to the base.

[0009] In some embodiments of this utility model, the rotation axis of the third connector and the base is located above the rotation axis of the back rod and the base.

[0010] In some embodiments of this utility model, the back rod is provided with a second sliding groove, the second sliding groove extends in the vertical direction, the second connector is provided with a second connecting shaft, the second connecting shaft is rotatably disposed in the second sliding groove and can slide along the length direction of the second sliding groove.

[0011] In some embodiments of this utility model, the backrest structure includes a lumbar support assembly and a backrest assembly. The backrest assembly is located above the lumbar support assembly and is connected to it. Both the lumbar support assembly and the backrest assembly are slidably disposed on the front side of the backrest along the vertical direction of the backrest. The connecting rod structure is rotatably connected to the lumbar support assembly.

[0012] In some embodiments of this utility model, the lumbar support assembly includes: a lumbar support fixing structure, which is slidably disposed on the front side of the backrest along the vertical direction of the backrest; and a lumbar support body, which is movably disposed on the lumbar support fixing structure and is rotatably connected to the backrest assembly.

[0013] In some embodiments of this utility model, the backrest assembly includes: a bracket, which is slidably disposed on the front side of the backrest along the vertical direction of the backrest; and a backrest body, the upper end of which is rotatably connected to the bracket, and the lower end of which is rotatably connected to the lumbar support assembly.

[0014] In some embodiments of this utility model, the back bar is provided with a clearance opening, the clearance opening is spaced apart from both ends of the back bar in the left and right directions, and at least a portion of the connecting rod structure is located within the clearance opening.

[0015] The seat according to an embodiment of the present utility model includes: a base; the aforementioned backrest assembly, wherein the lower end of the backrest rod is rotatably connected to the base, and the connecting rod structure is rotatably connected to the base.

[0016] According to the embodiment of this utility model, the seat, by setting the aforementioned backrest assembly, allows the lower end of the backrest rod to be rotatably connected to the base. This allows adjustment of the rotation angle of the backrest rod relative to the base to meet the user's different posture needs. Furthermore, a backrest structure is provided on the front side of the backrest rod. This backrest structure is slidable along the length of the first slide groove via a first connecting shaft. A connecting rod structure is rotatably connected to the backrest structure, the backrest rod, and the base. The connecting rod structure can drive the backrest structure to slide downwards along the first slide groove when the upper end of the backrest rod rotates downwards and backwards, and can drive the backrest structure to slide upwards along the first slide groove when the upper end of the backrest rod rotates upwards and forwards. This allows the backrest structure to adaptively adjust its position when the user adjusts their posture, adapting to changes in human posture and providing better adaptive support for the user.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a perspective view of the backrest assembly according to an embodiment of the present utility model; Figure 2 This is a perspective view of the backrest assembly without the backrest bar according to an embodiment of the present utility model; Figure 3 This is a cross-sectional view of the backrest assembly according to an embodiment of the present utility model.

[0019] Figure label: 100. Backrest assembly; 1. Back bar; 11. First slide groove; 12. Second slide groove; 13. Clearance opening; 14. First section; 15. Second section; 2. Backrest structure; 21. Backrest assembly; 211. Bracket; 212. First connecting shaft; 213. Backrest body; 22. Lumbar support assembly; 221. Lumbar support fixing structure; 222. Second connecting shaft; 223. Lumbar support body; 3. Linkage structure; 31. First connecting member; 32. Second connecting member. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The following is for reference. Figures 1-3 Description of a backrest assembly 100 according to an embodiment of the present utility model.

[0023] The backrest assembly 100 is used for the seat, which includes a base. The lower end of the backrest assembly 100 can be connected to the rear end of the base. A seat structure can be provided on the upper part of the base. The seat structure is used to support the user's buttocks, and the backrest assembly 100 is used to support the user's back and waist.

[0024] like Figure 1 and Figure 3 As shown, the backrest assembly 100 according to an embodiment of the present utility model includes a backrest rod 1, a backrest structure 2, and a connecting rod structure 3.

[0025] Specifically, the lower end of the backrest 1 is adapted to be rotatably connected to the base, thereby allowing the upper end of the backrest 1 to rotate backward and downward relative to the base. The backrest structure 2 is located on the front side of the backrest 1. The backrest 1 has a first sliding groove 11 extending vertically. The backrest structure 2 has a first connecting shaft 212, which is rotatably disposed within the first sliding groove 11 and slides along the length of the first sliding groove 11. The backrest 1 supports the backrest structure 2, which supports the user's back and waist. The rotation of the backrest 1 relative to the base allows for adjustment of the user's posture. The backrest structure 2 can slide along the length of the first sliding groove 11 via the first connecting shaft 212, allowing for adjustment of its position on the backrest 1 to meet different user needs.

[0026] In addition, the linkage structure 3 is rotatably connected to the backrest 1, the backrest structure 2, and the base, and is used to drive the backrest structure 2 to slide downward along the backrest 1 when the upper end of the backrest 1 rotates downward and backward. The linkage structure 3 realizes the linkage between the movement of the backrest 1 and the movement of the backrest structure 2. When the backrest 1 rotates backward, it causes the backrest structure 2 to move downward along the backrest 1. The position of the backrest structure 2 can be adjusted according to the user's posture to achieve better support for the user and avoid misalignment between the support position and the body's required support position.

[0027] Of course, when the upper end of the backrest 1 rotates forward and upward, the linkage structure 3 drives the backrest structure 2 to slide upward along the backrest 1. The position of the backrest structure 2 can be adjusted according to the user's posture to provide better support for the user and avoid misalignment between the support position and the human body's required support position.

[0028] This allows the backrest structure 2 to adjust its position in real time according to the rotation angle of the backrest 1 relative to the base, so that it can adapt to changes in the user's posture and provide better adaptive support when the user adjusts their posture.

[0029] According to the backrest assembly 100 of this utility model embodiment, by rotatably connecting the lower end of the backrest 1 to the base, the rotation angle of the backrest 1 relative to the base can be adjusted to meet the needs of different user postures. In addition, a backrest structure 2 is provided on the front side of the backrest 1. The backrest structure 2 is slidable along the length direction of the first slide groove 11 via the first connecting shaft 212. The connecting rod structure 3 is rotatably connected to the backrest structure 2, the backrest 1, and the base. When the upper end of the backrest 1 rotates downward and backward, the connecting rod structure 3 can drive the backrest structure 2 to slide downward along the first slide groove 11. When the upper end of the backrest 1 rotates upward and forward, the connecting rod structure 3 can drive the backrest structure 2 to slide upward along the first slide groove 11. This allows the backrest structure 2 to adaptively adjust its position when the user adjusts their posture, adapting to changes in human posture and providing better adaptive support for the user.

[0030] In some embodiments of this utility model, such as Figure 1and Figure 2 As shown, the linkage structure 3 includes a first connector 31 and a second connector 32. One end of the first connector 31 is rotatably connected to the backrest 1. The rotation axis of the first connector 31 and the backrest 1 is located behind the rotation axis of the backrest 1 and the base. One end of the second connector 32 is rotatably connected to the other end of the first connector 31. The other end of the second connector 32 is rotatably connected to the backrest structure 2. The first connector 31 is rotatably connected to the base, and the rotation axis of the first connector 31 and the base are spaced apart from the two ends of the first connector 31 in the length direction.

[0031] When the upper end of the backrest 1 rotates backward and downward, the end of the first connector 31 connected to the backrest 1 rotates backward and downward. The first connector 31 can be equivalent to a lever structure, with the fulcrum located at the connection between the first connector 31 and the base. The other end of the first connector 31 rotates forward and downward accordingly. The first connector 31 drives the second connector 32 to move downward, thereby driving the backrest structure 2 to slide downward along the backrest 1.

[0032] When the upper end of the backrest 1 rotates forward and upward, the end of the first connector 31 connected to the backrest 1 rotates forward and upward. The first connector 31 can be equivalent to a lever structure, with the fulcrum located at the connection between the first connector 31 and the base. The other end of the first connector 31 rotates backward and upward accordingly. The first connector 31 drives the second connector 32 to move upward, thereby driving the backrest structure 2 to slide upward along the backrest 1.

[0033] Thus, the backrest structure 2 can slide downward along the backrest 1 when the backrest 1 rotates backward and slide upward along the backrest 1 when the backrest 1 rotates forward through a simple linkage structure 3. This allows the backrest structure 2 to adaptively adjust its position when the user adjusts their posture, adapting to changes in human posture and providing better adaptive support for the user.

[0034] In some embodiments of this utility model, the linkage structure 3 further includes a third connecting member ( Figure 1 (Not shown), the first connecting member 31 is rotatably connected to the base via a third connecting member. One end of the third connecting member is rotatably connected to the first connecting member 31 and is spaced apart from both ends of the first connecting member 31 along its length. The other end of the third connecting member is rotatably connected to the base. It can be understood that the back rod 1, the base, the third connecting member, and the first connecting member 31 form a four-bar linkage.

[0035] This allows the rotation axis of the backrest 1 relative to the base to be separated from the rotation axis of the first connecting member 31 that is rotatably connected to the base, and also allows the rotation axis of the first connecting member 31 relative to the base to be located behind the rotation axis of the backrest 1 relative to the base. When the backrest 1 rotates backward relative to the base, the first connecting member 31 moves downward as a whole, thereby driving the backrest structure 2 to slide downward along the backrest 1; when the backrest 1 rotates forward relative to the base, the first connecting member 31 moves upward as a whole, thereby driving the backrest structure 2 to slide upward along the backrest 1. This allows the backrest structure 2 to adaptively adjust its position when the user adjusts their posture, adapting to changes in human posture and providing better adaptive support for the user.

[0036] In some embodiments of this utility model, such as Figure 1 As shown, the rotation axis of the third connector and the base is located above the rotation axis of the back rod 1 and the base. The back rod 1 includes a first segment 14 and a second segment 15, which are at an angle to each other. For example, the first segment 14 and the second segment 15 can be set vertically. One end of the first segment 14 is rotatably connected to the base, and one end of the second segment 15 is connected to the other end of the first segment 14. The backrest structure 2 is located on the second segment 15. The second segment 15 can extend in the vertical direction and can also tilt forward in the vertical direction. The third connector is located above the first segment 14. The first connector 31 is rotatably connected to the end of the first segment 14 near the second segment 15. The first segment 14, the first connector 31, the third connector, and the base form a four-bar linkage.

[0037] In this application, the third connector is located above the first segment 14, which facilitates the first connector 31 to be rotatably connected to the base through the third connector. When the backrest 1 rotates, the backrest structure 2 is driven to slide up and down along the backrest 1 through the linkage structure 3. This allows the backrest structure 2 to adaptively adjust its position when the user adjusts their posture, adapting to changes in human posture and providing better adaptive support for the user.

[0038] In some embodiments of this utility model, such as Figures 1-3As shown, the backrest structure 2 includes a lumbar support assembly 22 and a backrest assembly 21. The backrest assembly 21 is located above the lumbar support assembly 22 and is connected to it. Both the lumbar support assembly 22 and the backrest assembly 21 are slidably disposed on the front side of the backrest 1 along the vertical direction. The connecting rod structure 3 is rotatably connected to the lumbar support assembly 22. The lumbar support assembly 22 can be used to support the user's waist, and the backrest assembly 21 can be used to support the user's back, thereby providing better support for the user and improving user comfort. In addition, the lumbar support assembly 22 and the backrest assembly 21 are connected to each other, enabling linkage between the lumbar support assembly 22 and the backrest assembly 21. When the backrest 1 rotates backward, the lumbar support assembly 22 and the backrest assembly 21 slide downward along the backrest 1 simultaneously. When the backrest 1 rotates forward, the lumbar support assembly 22 and the backrest assembly 21 slide upward simultaneously. This allows the backrest structure 2 to adaptively adjust its position when the user adjusts their posture, adapting to changes in human posture and providing better adaptive support for the user.

[0039] In some embodiments of this utility model, such as Figure 3 As shown, the backrest 1 is provided with a second sliding groove 12, which extends vertically. The second connecting member 32 is provided with a second connecting shaft 222, which is rotatably disposed within the second sliding groove 12 and can slide along the length of the second sliding groove 12. The second connecting member 32 can slide along the length of the second sliding groove 12 via the second connecting shaft 222, allowing adjustment of the position of the second connecting member 32 on the backrest 1 to meet different user needs.

[0040] In this embodiment, the first connecting shaft 212 is connected to the backrest assembly 21, and the second connecting member 32 is connected to the lumbar support assembly 22. This allows the backrest assembly 21 and the lumbar support assembly 22 to slide independently, avoiding interference between them during the sliding process. Furthermore, the first slide groove 11 can be configured to match only the backrest assembly 21, and the second slide groove 12 can be configured to match only the lumbar support assembly 22, reducing the design difficulty of the first slide groove 11 and the second slide groove 12.

[0041] Optionally, when the back rod 1 is vertically arranged, the first slide groove 11 and the second slide groove 12 can be located in the same vertical plane. Of course, the first slide groove 11 and the second slide groove 12 can be located in different vertical planes.

[0042] In some embodiments of this utility model, such as Figure 1 and Figure 3As shown, the first slide groove 11 and the second slide groove 12 extend along the thickness direction of the back rod 1 but do not penetrate the back rod 1. The front sides of the first slide groove 11 and the second slide groove 12 are open. The first connecting shaft 212 is located in the first slide groove 11, and the second connecting shaft 222 is located in the second slide groove 12. The two end faces of the first connecting shaft 212 in the left and right directions are slidably connected to the two inner walls of the first slide groove 11 in the left and right directions. At the same time, the surface of the first connecting shaft 212 facing the bottom wall of the first slide groove 11 can be slidably connected to the bottom wall of the first slide groove 11. The two end faces of the second connecting shaft 222 in the left and right directions are slidably connected to the two inner walls of the second slide groove 12 in the left and right directions. At the same time, the surface of the second connecting shaft 222 facing the bottom wall of the second slide groove 12 can be slidably connected to the bottom wall of the second slide groove 12.

[0043] In some embodiments of this utility model, such as Figures 1-3 As shown, the lumbar support assembly 22 includes a lumbar support fixing structure 221 and a lumbar support body 223. The lumbar support fixing structure 221 is slidably disposed on the front side of the backrest 1 along the vertical direction. The lumbar support body 223 is movably disposed on the lumbar support fixing structure 221 and is rotatably connected to the backrest assembly 21. The lumbar support fixing structure 221 is used to support and fix the lumbar support body 223 and drive the lumbar support body 223 to slide along the vertical direction of the backrest 1. The lumbar support body 223 is used to support the user's waist. The lumbar support body 223 is movably disposed on the lumbar support fixing structure 221, and the angle of the lumbar support can be adjusted so that it can fit the user's waist well when the user's posture changes, thereby improving the support effect on the user's waist.

[0044] For example, the lumbar support body 223 can rotate relative to the lumbar support fixing structure 221, and the lumbar support body 223 and the lumbar support fixing structure 221 can be connected by a ball joint. Of course, this utility model is not limited to this. The lumbar support body 223 and the lumbar support fixing structure 221 can also be connected by an intermediate connector. The intermediate connector and the lumbar support fixing structure 221 are rotatably connected, and the lumbar support body 223 and the intermediate connector are rotatably connected. Moreover, the rotation axis between the intermediate connector and the lumbar support fixing structure 221 can be set perpendicular to the rotation axis between the intermediate connector and the lumbar support body 223, thereby also realizing the 10-degree angle adjustment of the lumbar support body 223 relative to the lumbar support fixing structure 221.

[0045] The linkage structure 3 is rotatably connected to the lumbar support fixing structure 221, which facilitates the linkage structure 3 to drive the lumbar support fixing structure 221 to slide up and down along the backrest 1. This facilitates the lumbar support body 223 and the backrest assembly 21 to slide up and down along the backrest 1, allowing the backrest structure 2 to adaptively adjust its position when the user adjusts their posture. This adapts to changes in human posture and provides better adaptive support for the user.

[0046] Optionally, the lumbar support body 223 is U-shaped. When the backrest 1 is set vertically, the lumbar support body 223 can be a U-shaped protrusion on the projection plane perpendicular to the vertical direction.

[0047] In some embodiments of this utility model, such as Figures 1-3 As shown, the backrest assembly 21 includes a bracket 211 and a backrest body 213. The bracket 211 is slidably disposed on the front side of the backrest 1 along the vertical direction of the backrest 1. The upper end of the backrest body 213 is rotatably connected to the bracket 211, and the lower end of the backrest body 213 is rotatably connected to the lumbar support assembly 22, specifically to the upper end of the lumbar support body 223 of the lumbar support assembly 22. On the one hand, when the backrest assembly 21 and the lumbar support assembly 22 slide up and down along the backrest 1, movement interference may occur between the backrest body 213 and the lumbar support assembly 22, leading to a jamming situation. On the other hand, when the lumbar support body 223 of the lumbar support assembly 22 is in motion, the backrest body 213 can rotate synchronously to adapt to changes in the user's posture and provide better support for the user.

[0048] It can be understood that the rotation axis of the lumbar support body 223 in the backrest body 213 and the lumbar support assembly 22 extends in the left and right direction, and the rotation axis of the bracket 211 and the backrest body 213 also extends in the left and right direction.

[0049] Optionally, the bracket 211 includes a third segment and a fourth segment. The lower ends of the third segment and the fourth segment are connected, and the upper ends of the third segment and the fourth segment are connected to the backrest body 213. The distance between the third segment and the fourth segment gradually increases from bottom to top. A stable triangular structure can be formed between the bracket 211 and the backrest body 213, thereby ensuring the stability of the backrest assembly 21 structure.

[0050] It should be noted that the up-down, left-right, and front-back directions in this application are based on the front-back, up-down, and left-right directions of the seat. That is, when the user is sitting in the seat, the front side of the user is the front side of the seat, the back side of the user is the back side of the seat, the left side of the user is the left side of the seat, and the right side of the user is the right side of the seat.

[0051] Optionally, such as Figure 1 and Figure 3 As shown, the backrest body 213 is arranged in a ring. When the backrest rod 1 is set vertically, the backrest body 213 can be an arc protruding towards the rear on the projection plane perpendicular to the up and down direction. This can better adapt to the shape of the user's back, improve the support effect on the user's back, and improve the user's comfort.

[0052] In some embodiments of this utility model, such as Figure 1 and Figure 3As shown, the backrest 1 is provided with a clearance opening 13, which extends through the backrest 1 along its thickness direction. The clearance opening 13 is spaced apart from both ends of the backrest 1 in the left-right direction, and at least a portion of the connecting rod structure 3 is located within the clearance opening 13. This facilitates the rotatable connection between the connecting rod structure 3 and the backrest 1, the base, and the backrest structure 2, while also making the backrest assembly 100 more compact.

[0053] The following describes a seat according to an embodiment of the present invention.

[0054] The seat according to an embodiment of the present utility model includes a base and the aforementioned backrest assembly 100, wherein the lower end of the backrest 1 is rotatably connected to the base, and the connecting rod structure 3 is rotatably connected to the base.

[0055] The linkage structure 3 enables the linkage between the movement of the backrest 1 and the movement of the backrest structure 2. When the backrest 1 rotates backward, the backrest structure 2 moves downward along the backrest 1. The position of the backrest structure 2 can be adjusted according to the user's posture to provide better support for the user and avoid misalignment between the support position and the position required by the human body.

[0056] Of course, when the upper end of the backrest 1 rotates forward and upward, the linkage structure 3 drives the backrest structure 2 to slide upward along the backrest 1. The position of the backrest structure 2 can be adjusted according to the user's posture to provide better support for the user and avoid misalignment between the support position and the human body's required support position.

[0057] This allows the backrest structure 2 to adjust its position in real time according to the rotation angle of the backrest 1 relative to the base, so that it can adapt to changes in the user's posture and provide better adaptive support when the user adjusts their posture.

[0058] According to the embodiment of this utility model, the seat, by setting the aforementioned backrest assembly 100, allows the lower end of the backrest 1 to be rotatably connected to the base. By adjusting the rotation angle of the backrest 1 relative to the base, the needs of the user for different postures can be met. In addition, a backrest structure 2 is provided on the front side of the backrest 1. The backrest structure 2 is slidable along the length direction of the first slide groove 11 via the first connecting shaft 212. The connecting rod structure 3 is rotatably connected to the backrest structure 2, the backrest 1, and the base. When the upper end of the backrest 1 rotates downward and backward, the connecting rod structure 3 can drive the backrest structure 2 to slide downward along the first slide groove 11. When the upper end of the backrest 1 rotates upward and forward, the connecting rod structure 3 can drive the backrest structure 2 to slide upward along the first slide groove 11. This allows the backrest structure 2 to adaptively adjust its position when the user adjusts their posture, adapting to changes in human posture and providing better adaptive support for the user.

[0059] In some embodiments of this utility model, a seat is provided on the base, at least a portion of which is movably disposed on the base. The seat is used to support the user's buttocks and is tractively connected to the backrest 1. The seat is configured to move upward and backward when the backrest 1 rotates backward. This allows the seat to be adjusted synchronously when the user leans back, meeting the user's posture change requirements, ensuring effective support for the user, and improving user comfort.

[0060] In some embodiments of this utility model, a support member is provided below the base, the base can rotate relative to the support member, and the height of the base can be adjusted relative to the support member in the vertical direction. Rollers can be provided below the support member to facilitate the movement of the seat.

[0061] In some embodiments of this utility model, the seat may also include armrests, which may be provided on the seat and move synchronously with the seat. Of course, the armrests may also be provided on the base. The armrests are connected to the seat or to the backrest assembly 100, and move synchronously when the backrest 1 rotates or the seat moves.

[0062] The backrest assembly 100 and other components and operations of the seat according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A backrest assembly, characterized in that, For use in a seat, the seat including a base, the backrest assembly including: Back rod (1), the lower end of which is adapted to be rotatably connected to the base; Backrest structure (2), the backrest structure (2) is provided on the front side of the backrest (1), the backrest (1) is provided with a first sliding groove (11), the first sliding groove (11) extends in the vertical direction, the backrest structure (2) is provided with a first connecting shaft (212), the first connecting shaft (212) is rotatably provided in the first sliding groove (11) and can slide along the length direction of the first sliding groove (11); The linkage structure (3) is rotatably connected to the back rod (1), the backrest structure (2) and the base, and is used to drive the backrest structure (2) to slide downward along the back rod (1) when the upper end of the back rod (1) rotates downward and backward.

2. The backrest assembly according to claim 1, characterized in that, The linkage structure (3) includes: The first connector (31) is rotatably connected to the back rod (1) at one end; The second connector (32) has one end rotatably connected to the other end of the first connector (31), and the other end of the second connector (32) is rotatably connected to the backrest structure (2). The first connector (31) is rotatably connected to the base, and the rotation axes of the first connector (31) and the base are spaced apart from the two ends of the first connector (31) in the length direction.

3. The backrest assembly according to claim 2, characterized in that, The linkage structure (3) also includes: The third connector is connected to the base through the first connector (31). One end of the third connector is connected to the first connector (31) and is spaced apart from both ends of the first connector (31) in the length direction. The other end of the third connector is connected to the base.

4. The backrest assembly according to claim 3, characterized in that, The rotation axis of the third connector and the base is located above the rotation axis of the back rod (1) and the base.

5. The backrest assembly according to claim 2, characterized in that, The back rod (1) is provided with a second sliding groove (12), which extends in the vertical direction. The second connector (32) is provided with a second connecting shaft (222), which is rotatably disposed in the second sliding groove (12) and can slide along the length direction of the second sliding groove (12).

6. The backrest assembly according to any one of claims 1-5, characterized in that, The backrest structure (2) includes a lumbar support assembly (22) and a backrest assembly (21). The backrest assembly (21) is located above the lumbar support assembly (22) and is connected to each other. The lumbar support assembly (22) and the backrest assembly (21) are slidably disposed on the front side of the backrest (1) along the up and down direction of the backrest (1). The connecting rod structure (3) is rotatably connected to the lumbar support assembly (22).

7. The backrest assembly according to claim 6, characterized in that, The lumbar support assembly (22) includes: A lumbar support fixing structure (221) is slidably disposed on the front side of the back bar (1) along the up and down direction of the back bar (1); The lumbar support body (223) is movably mounted on the lumbar support fixing structure (221) and is rotatably connected to the backrest assembly (21).

8. The backrest assembly according to claim 7, characterized in that, The backrest assembly (21) includes: A bracket (211) is slidably disposed on the front side of the back rod (1) along the vertical direction of the back rod (1); The backrest body (213) is rotatably connected to the bracket (211) at its upper end and rotatably connected to the lumbar support assembly (22) at its lower end.

9. The backrest assembly according to any one of claims 1-5, characterized in that, The back bar (1) is provided with a clearance opening (13), which is spaced apart from both ends of the back bar (1) in the left and right directions, and at least part of the connecting rod structure (3) is located in the clearance opening (13).

10. A type of seat, characterized in that, include: Base; According to any one of claims 1-9, the lower end of the backrest (1) is rotatably connected to the base, and the connecting rod structure (3) is rotatably connected to the base.

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