Seat

Abstract

The utility model discloses a seat, which belongs to the field of sitting and lying furniture and comprises a base and a seat cushion shell with an initial position relative to the base. The connecting rod mechanism is arranged between the seat cushion shell and the base, and the seat cushion shell swings around a set axis relative to the base through the connecting rod mechanism; the elastic supporting piece is arranged between the seat cushion shell and the base through a connecting rod mechanism and enables the seat cushion shell to have the tendency of swinging towards the initial position to apply pressure to the seat cushion shell. The chair back is arranged on the base in a sliding manner along a set direction; the linkage assembly is arranged among the chair back, the base and the connecting rod mechanism; the linkage assembly is configured to be driven by the connecting rod mechanism to act and drive the chair back to move forwards in the process that the seat cushion shell swings away from the initial position. When a user sits, the position of the chair back can be automatically adjusted to make contact with the back of the user to form effective supporting, and the supporting force of the chair back on the back of the user can be adjusted in a self-adaptive mode according to the weight of the user.

Description

Technical Field

[0001] The utility model relates to the technical field of sitting and lying furniture, and particularly relates to a seat. Background Art

[0002] The backrest of a seat can be leaned on by a user. The backrest has the functions of improving comfort and assisting in adjusting the seat. Especially for a study chair for children, applying an appropriate supporting force to the back of the child through the backrest can play a role in correcting the sitting posture of the child. To adapt to users of different ages, body shapes, and weights, in related technologies, the backrest is generally designed to be able to adjust its front and rear positions relative to the seat frame manually or electrically, so that the backrest is in an appropriate position required by the user. However, the manual adjustment scheme often requires a locking mechanism, and the manual adjustment operation is relatively cumbersome. In most cases, it is difficult for children to complete the manual operation by themselves; although the electric adjustment scheme is relatively simple to operate (generally, operation buttons or touch screens are set), its structural design is complex and the cost is high. Content of the Utility Model

[0003] The purpose of the utility model is to provide a seat, which can automatically adjust the position of the backrest to contact with the user's back to form an effective support when the user sits down, and can adaptively adjust the supporting force of the backrest on the user's back according to the user's own weight.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A seat, comprising:

[0006] A seat frame, which includes a base and a seat cushion shell having an initial position relative to the base;

[0007] A link mechanism, which is arranged between the seat cushion shell and the base, and the seat cushion shell is swingably arranged relative to the base around a set axis through the link mechanism;

[0008] An elastic support member, which is arranged between the seat cushion shell and the base through the link mechanism and presses on the seat cushion shell so that the seat cushion shell has a tendency to swing towards the initial position;

[0009] A backrest, which is slidably arranged on the base along a set direction; and,

[0010] A linkage component, which is arranged between the backrest, the base and the link mechanism;

[0011] Wherein, the set direction is the front and rear direction of the seat, the set axis is in the same direction as the left and right direction of the seat, and the linkage component is configured to be able to be driven by the link mechanism and drive the backrest to move forward during the swinging process of the seat cushion shell away from the initial position.

[0012] Preferably, the linkage assembly includes a connecting member fixedly connected to the bottom of the backrest, and a limiting structure is provided between the base and the connecting member for restricting the sliding direction of the connecting member relative to the base.

[0013] Preferably, the base is a housing forming a cavity, and the limiting structure includes an opening provided on the rear side wall of the base. The connecting member has a sliding section, and the opening is adapted to the outer contour of the sliding section. The connecting member extends out of the cavity through the opening and slides along a set direction under the restriction of the opening; and / or, the limiting structure includes a limiting chute and a slider slidably disposed in the limiting chute. A connecting frame is provided in the cavity, the limiting chute is formed on the connecting frame and extends along a set direction, and the slider is fixedly disposed on the part of the connecting member located in the cavity.

[0014] Preferably, the seat cushion shell extends into the cavity, and there is a clearance fit between the outer surfaces on both sides of the seat cushion shell and the inner walls on both sides of the cavity, and there is a distance for the seat cushion shell to swing between the outer surface at the rear side of the seat cushion shell and the rear side wall of the cavity.

[0015] Preferably, the linkage assembly further includes a driving member and a transmission member connected to the driving member. The driving member is connected to the link mechanism, the transmission member is connected to the connecting member, and the driving member is configured to be able to swing under the drive of the link mechanism, and the transmission member is configured to be able to act under the drive of the driving member to drive the connecting member to slide.

[0016] Preferably, the transmission member includes a round shaft configured to be able to swing under the drive of the driving member. The connecting member is provided with a guiding groove, and the length direction of the guiding groove intersects with the set direction. The round shaft extends into the guiding groove and the two are slidably matched.

[0017] Preferably, the transmission member further includes a connecting shaft, a swing arm and a transmission block. Both the swing arm and the transmission block are fixedly disposed on the connecting shaft. The connecting shaft is rotatably disposed on the base. The driving member includes a driving block fixedly disposed on the link mechanism, and the round shaft is fixedly disposed on the swing arm; the driving block is formed with a driving tooth, the transmission block is formed with a transmission tooth, and the driving block and the transmission block are meshed and transmitted through the driving tooth and the transmission tooth.

[0018] Preferably, the linkage mechanism includes a first linkage assembly and a second linkage assembly. The first linkage assembly includes a first rotating shaft rotatably disposed on the base and a first swing rod fixedly disposed on the first rotating shaft. One end of the first swing rod away from the first rotating shaft is movably hinged to the seat shell; the second linkage assembly includes a second rotating shaft rotatably disposed on the base and a second swing rod fixedly disposed on the second rotating shaft. One end of the second swing rod away from the second rotating shaft is movably hinged to the seat shell; the driving block is fixedly disposed on the first rotating shaft.

[0019] Preferably, the elastic support member is a pneumatic rod. One end of the pneumatic rod is movably hinged to the second rotating shaft, and the other end of the pneumatic rod is movably hinged to the connecting shaft.

[0020] Preferably, the backrest includes a backrest bracket and a support structure disposed on the backrest bracket. The backrest bracket is slidably disposed on the base along a set direction; the support structure is configured to be able to adjust its position relative to the backrest bracket in the height direction of the seat. The support structure includes a support headrest and / or a support backrest and / or a support lumbar support.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] The seat frame is separately designed into two parts, namely a base and a seat shell. The two are swing-connected through a linkage mechanism. When a user sits on the seat shell and presses down the seat shell, the seat shell can be driven to swing relative to the base. During the above swinging process, the linkage mechanism can drive the linkage assembly to act, and then drive the backrest slidably disposed on the base to move forward through the linkage assembly. The backrest moves forward until it contacts the user's back and forms an effective support for the user's back. That is to say, applying the present application can automatically adjust the position of the backrest when the user sits down to contact the user's back to form an effective support. At the same time, the elastic support member supports the seat shell. When the user sits down and presses on the seat shell, the elastic support member can adjust the force acting on the seat shell according to the user's weight, and then can adjust the support strength of the backrest for the user's back through the linkage assembly. That is to say, applying the present application can also adaptively adjust the support strength of the backrest for the user's back according to the user's own weight. In addition, after the user leaves, the elastic support member can press on the seat shell to make the seat shell return to the initial position, and synchronously drive the linkage mechanism and the linkage assembly to reset to the initial state. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a seat provided by an embodiment of the present application;

[0024] Figure 2 It is a schematic diagram of the seat provided by the embodiment excluding the seat cushion and the armrests;

[0025] Figure 3 ForFigure 2 Exploded view of the seat in

[0026] Figure 4 For Figure 3 Further exploded view of the seat in

[0027] Figure 5 Schematic connection diagram of the linkage mechanism, linkage component and elastic support

[0028] Figure 6 Cross-sectional view of the seat frame, linkage mechanism, support and linkage component in the seat provided by the embodiment (the seat cushion shell is in the initial position);

[0029] Figure 7 Cross-sectional view of the seat frame, linkage mechanism, support and linkage component in the seat provided by the embodiment (the seat cushion shell leaves the initial position).

[0030] Wherein, 1, base; 10, cavity; 11, connecting frame; 110, limit sliding groove; 12, opening; 2, seat cushion shell; 20, spacing; 3, linkage mechanism; 30, first rotating shaft; 31, first swing rod; 32, second rotating shaft; 33, second swing rod; 4, elastic support; 5, backrest; 50, backrest bracket; 51, support backrest; 52, support lumbar support; 6, linkage component; 60, connecting member; 600, sliding section; 601, slider; 602, guiding groove; 61, driving member; 62, transmission member; 620, connecting shaft; 621, swing arm; 622, transmission block; 623, round shaft; 7, support leg; 8, seat cushion; 9, armrest. Detailed implementation manners

[0031] Next, in combination with the accompanying drawings and specific implementation manners, the present utility model will be further described. It should be noted that, on the premise of no conflict, the following described embodiments or technical features can be arbitrarily combined to form new embodiments. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application.

[0032] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically and precisely defined.

[0033] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "connected", "communicated", "connected" should be understood in a broad sense. For example, it can be a fixed connection, or it can be connected through an intermediate medium, or it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0034] This embodiment provides a seat, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 shown in, the seat includes a seat frame, a link mechanism 3, an elastic support member 4, a backrest 5 and a linkage assembly 6. The seat frame includes a base 1 and a seat cushion shell 2 having an initial position relative to the base 1. Among them, the base 1 is installed on the support leg 7 of the seat, the link mechanism 3 is arranged between the seat cushion shell 2 and the base 1, the seat cushion shell 2 is swingably arranged relative to the base 1 around a set axis through the link mechanism 3, and the seat cushion 8 of the seat is arranged on the seat cushion shell 2. That is, the seat cushion shell 2 can swing relative to the base 1 under the action of an external force. Through the limitation of the link mechanism 3, the swinging action of the seat cushion shell 2 is carried out around the set axis, and the set axis is in the same direction as the left-right direction of the seat. The elastic support member 4 is arranged between the seat cushion shell 2 and the base 1 through the link mechanism 3, and the elastic support member 4 presses on the seat cushion shell 2 with a tendency to make the seat cushion shell 2 swing towards the initial position. That is, the elastic support member 4 applies a force to the seat cushion shell 2 and the base 1 through the link mechanism 3. When there is no external force, the seat cushion shell 2 is in the initial position relative to the base 1 under the support of the elastic support member 4; when the user sits down, the seat cushion shell 2 bears the weight of the user and swings relative to the base 1 against the support force of the elastic support member 4 until the support force applied by the elastic support member 4 to the seat cushion shell 2 through the link mechanism 3 reaches a balance with the pressure applied by the user to the seat cushion shell 2 again.

[0035] In this embodiment, the backrest 5 is slidably arranged on the base 1 in a set direction, and the set direction is the front-back direction of the seat, that is, the backrest 5 can adjust its position relative to the base 1 in the front-back direction of the seat. The linkage assembly 6 in this embodiment is arranged between the backrest 5, the base 1 and the linkage mechanism 3, and the linkage assembly 6 is configured to be driven by the linkage mechanism 3 to act and drive the backrest 5 to move forward during the swinging process of the seat shell 2 away from the initial position.

[0036] The seat provided in this embodiment divides the seat frame into two parts, namely the base 1 and the seat shell 2. The two are swing-connected through the linkage mechanism 3. When the user sits on the seat shell 2 and presses down the seat shell 2, the seat shell 2 can be driven to swing relative to the base 1. During the above swinging process, the linkage mechanism 3 can drive the linkage assembly 6 to act, and then drive the backrest 5 slidably arranged on the base 1 to move forward through the linkage assembly 6. The backrest 5 moves forward until it contacts the user's back and forms an effective support for the user's back. That is, applying this application can automatically adjust the position of the backrest 5 to contact the user's back and form an effective support when the user sits down. At the same time, the elastic support member 4 supports the seat shell 2. When the user sits down and presses on the seat shell 2, the elastic support member 4 can adjust the force acting on the seat shell 2 according to the user's weight, and then can adjust the support force of the backrest 5 on the user's back through the linkage assembly 6. That is, applying this application can also adaptively adjust the support force of the backrest 5 on the user's back according to the user's own weight. In addition, after the user leaves, the elastic support member 4 can press on the seat shell 2 to make the seat shell 2 return to the initial position, and synchronously drive the linkage mechanism 3 and the linkage assembly 6 to reset to the initial state. In this way, each component in the seat can repeat the above actions when the next user sits down, achieving the effect of adaptive back chasing.

[0037] It should be noted that the front-back direction and the left-right direction of the seat in this embodiment are both referenced from the perspective of the user sitting on the seat. Specifically, the visual direction of the user sitting on the seat is the front of the seat, and the back of the user is the back of the seat; the left and right sides of the user are the left and right sides of the seat respectively.

[0038] The linkage assembly 6 in this embodiment includes a connecting member 60. The connecting member 60 is fixedly connected to the bottom of the backrest 5. A limiting structure is provided between the base 1 and the connecting member 60 to limit the sliding direction of the connecting member 60 relative to the base 1. By limiting the sliding of the connecting member 60 and the backrest 5 fixedly connected to the connecting member 60 in the set direction, it can ensure that the backrest 5 always maintains a set angle with the user's back. Specifically in this embodiment, as Figure 4As shown in the figure, the base 1 is a housing formed with a cavity 10. There are two sets of limiting structures. One set of limiting structures includes an opening 12 provided on the rear sidewall of the base 1. The connecting member 60 has a sliding section 600. The opening 12 is adapted to the outer contour of the sliding section 600. The connecting member 60 extends out of the cavity 10 through the opening 12 and slides along a set direction under the limitation of the opening 12. The other set of limiting structures includes a limiting chute 110 and a slider 601 slidably disposed in the limiting chute 110. A connecting frame 11 is provided in the cavity 10. The limiting chute 110 is formed on the connecting frame 11 and extends along a set direction. The slider 601 is fixedly provided on the part of the connecting member 60 located in the cavity 10.

[0039] It is easy to understand that in an alternative embodiment, the limiting structure may also only include the opening 12 provided on the rear sidewall of the base 1, or the limiting structure may also only include the limiting chute 110 and the slider 601.

[0040] Furthermore, in combination with Figure 3 As shown in the figure, in this embodiment, the seat cushion shell 2 extends into the cavity 10. And there is a clearance fit between the outer surfaces on both sides of the seat cushion shell 2 and the inner walls on both sides of the cavity 10. There is a spacing 20 for the seat cushion shell 2 to swing between the outer surface at the rear side of the seat cushion shell 2 and the rear sidewall of the cavity 10. Designing the base 1 as a housing with a cavity 10 allows the linkage assembly 6 and the link mechanism 3 to be disposed in the cavity 10, which can reduce the exposure of components and increase the overall aesthetics. At the same time, the seat cushion shell 2 is also designed to partially extend into the cavity 10, and the swing stroke of the seat cushion shell 2 is limited by the cooperation between the sidewall of the seat cushion shell 2 and the sidewall of the cavity 10, which can improve the stability of the swing of the seat cushion shell 2 and prevent the seat cushion shell 2 from shaking relative to the base 1 in the left-right direction of the seat.

[0041] As described above, the linkage assembly 6 in this embodiment includes a connecting member 60. Further, the linkage assembly 6 in this embodiment further includes a driving member 61 and a transmission member 62 connected to the driving member 61. Among them, the driving member 61 is connected to the link mechanism 3, the transmission member 62 is connected to the connecting member 60, and the driving member 61 is configured to be able to swing under the drive of the link mechanism 3, and the transmission member 62 is configured to be able to act under the drive of the driving member 61 to drive the connecting member 60 to slide. In this way, when the user sits down, the seat cushion shell 2 is pressed to drive the link mechanism 3 to swing. The driving member 61 is driven by the link mechanism 3 to swing along with the link mechanism 3. The driving member 61 can drive the transmission member 62 to act during the swinging process, and the transmission member 62 can drive the connecting member 60 to move forward during the action process.

[0042] As Figure 3As shown in the figure, the transmission member 62 in this embodiment includes a circular shaft 623. The circular shaft 623 is configured to be able to swing under the drive of the driving member 61. The connecting member 60 is provided with a guiding groove 602. The length direction of the guiding groove 602 intersects with the set direction. The circular shaft 623 extends into the guiding groove 602 and the two are in sliding fit. That is, under the limiting action of the aforementioned limiting structure, the connecting member 60 can only slide relative to the base 1 along the set direction. The acting force exerted on the inner wall of the guiding groove 602 during the swinging of the circular shaft 623 drives the connecting member 60 to move. Further, as Figure 5 As shown in the figure, the transmission member 62 further includes a connecting shaft 620, a swing arm 621, and a transmission block 622. Both the swing arm 621 and the transmission block 622 are fixedly arranged on the connecting shaft 620. The connecting shaft 620 is rotatably arranged on the base 1. The driving member 61 includes a driving block fixedly arranged on the link mechanism 3. The circular shaft 623 is fixedly arranged on the swing arm 621. The driving block is formed with a driving tooth, and the transmission block 622 is formed with a transmission tooth. The driving block and the transmission block 622 are in meshing transmission through the driving tooth and the transmission tooth. That is, the driving block is fixedly arranged on the link mechanism 3. When the link mechanism 3 swings following the seat cushion shell 2, it can drive the driving block to swing. The driving block can drive the transmission block 622 to swing through meshing transmission, and then drive the connecting shaft 620 fixed to the driving block to rotate. When the connecting shaft 620 rotates, it can drive the swing arm 621 fixedly arranged on the connecting shaft 620 and the circular shaft 623 fixedly arranged on the swing arm 621 to swing.

[0043] As Figure 5 As shown in the figure, the link mechanism 3 in this embodiment includes a first link assembly and a second link assembly. The first link assembly includes a first rotating shaft 30 rotatably arranged on the base 1 and a first swing rod 31 fixedly arranged on the first rotating shaft 30. One end of the first swing rod 31 away from the first rotating shaft 30 is movably hinged to the seat cushion shell 2. The second link assembly includes a second rotating shaft 32 rotatably arranged on the base 1 and a second swing rod 33 fixedly arranged on the second rotating shaft 32. One end of the second swing rod 33 away from the second rotating shaft 32 is movably hinged to the seat cushion shell 2. The driving block is fixedly arranged on the first rotating shaft 30.

[0044] During assembly, the first rotating shaft 30 and the second rotating shaft 32 are arranged in parallel and at intervals. Both ends of the first rotating shaft 30 and the second rotating shaft 32 are movably hinged to the side wall of the base 1. One end of the first swing rod 31 is fixedly arranged on the first rotating shaft 30, and the other end of the first swing rod 31 is movably hinged to the seat shell 2. Similarly, one end of the second swing rod 33 is fixedly arranged on the second rotating shaft 32, and the other end of the second swing rod 33 is movably hinged to the seat shell 2. Preferably, in this embodiment, two first swing rods 31 are fixedly arranged at both ends of the first rotating shaft 30, and two second swing rods 33 are fixedly arranged at both ends of the second rotating shaft 32. That is, two first swing rods 31 and two second swing rods 33 are provided, which can improve the stability of the linkage mechanism 3 during operation. In this embodiment, cross arms for fixed connection are also arranged between the two first swing rods 31 and between the two second swing rods 33, which can further improve the stability of the linkage mechanism 3 and ensure that the seat shell 2 does not sway left and right during the swinging process.

[0045] The seat shell 2 is swingably arranged on the base 1 through the linkage mechanism 3 designed above, and then a support force is provided to the seat shell 2 by the elastic support member 4, so that the seat shell 2 can remain in the initial position relative to the base 1 without external force. Specifically, in this embodiment, the elastic support member 4 is a pneumatic rod. One end of the pneumatic rod is movably hinged to the second rotating shaft 32, and the other end of the pneumatic rod is movably hinged to the connecting shaft 620.

[0046] It should be noted that the pneumatic rod can apply a certain force to the second rotating shaft 32 in the linkage mechanism 3 at the initial state through its output end, and this force can be partially transmitted to the seat shell 2 through the linkage mechanism 3 to apply a support force to the seat shell 2. The force applied by the pneumatic rod to the linkage mechanism 3 through its output end at the initial state can be preset. The seat provided in this embodiment is designed as follows: the support force indirectly applied to the seat shell 2 by the pneumatic rod at the initial state is designed to be about 160 N. That is, a user with a weight not exceeding 16 kg will not cause the seat shell 2 to swing relative to the base 1 after sitting on this seat. After a user with a weight exceeding 16 kg sits down, the pneumatic rod can be indirectly acted on through the seat shell 2 and the linkage mechanism 3, so that the pneumatic rod contracts, and the output end of the pneumatic rod outputs a greater force until it adapts to the weight of the user. It is easy to understand that the magnitude of the force applied by the pneumatic rod to the linkage mechanism 3 through its output end at the initial state can be designed as other values. Specifically, it can be designed according to the weight of the target user group.

[0047] Such as Figure 1As shown in the figure, the backrest 5 in this embodiment includes a backrest bracket 50 and a support structure disposed on the backrest bracket 50. The backrest bracket 50 is slidably disposed on the base 1 along a set direction. That is, the aforesaid connection member 60 is fixedly connected to the backrest 5 means that the connection member 60 is fixedly connected to the backrest bracket 50 in the backrest 5. The said support structure specifically includes a support backrest 51 and a support lumbar support 52. The support backrest 51 can support the user's back, and the support lumbar support 52 can support the user's waist, improving the use comfort. It is easy to understand that in other alternative embodiments, the support structure may include a support headrest (for supporting the user's headrest part), one or more of the support backrest 51 and the support lumbar support 52. Further, the support structure in this embodiment is configured to be able to adjust its position relative to the backrest bracket 50 along the height direction of the seat. It is easy to understand that the height adjustment scheme of components such as the support headrest, the support backrest 51 and the support lumbar support 52 relative to the backrest bracket 50 can refer to such height adjustment schemes in the prior art, and will not be elaborated here.

[0048] Combined Figure 6 and Figure 7 The adaptive backtracking process of the seat after the user sits down is described as follows with reference to the figure shown: When a user whose weight exceeds the set weight (as aforesaid, the set weight of the seat provided in this embodiment is 16 kg) sits down, the force exerted by the user on the pneumatic rod through the seat cushion shell 2 and the linkage mechanism 3 exceeds the force exerted by the pneumatic rod on the linkage mechanism 3 in the initial state. Thereby, the seat cushion shell 2 can be pressed down so that the seat cushion shell 2 swings relative to the base 1, and the linkage mechanism 3 follows to swing, and then the pneumatic rod is compressed, so that the force exerted by the output end of the pneumatic rod on the linkage mechanism 3 increases to match the user's weight.

[0049] At the same time, during the swinging process of the linkage mechanism 3, the driving block fixed on the first rotating shaft 30 will be driven to swing. During the swinging process, the driving block drives the transmission block 622 to swing through meshing transmission, and then the connecting shaft 620 fixed to the transmission block 622 can be driven to rotate. During the rotation process of the connecting shaft 620, the swing arm 621 fixed thereto and the round shaft 623 fixed to the swing arm 621 can be driven to swing. During the swinging process of the round shaft 623, the connection member 60 can be driven to act through the interaction with the guiding groove 602 on the connection member 60. Since a limiting structure is provided between the connection member 60 and the base 1, the connection member 60 can only slide along the set direction. Thus, the backrest 5 can be driven to move forward relative to the seat frame by the connection member 60 until the backrest 5 contacts the user's back and forms a support for the user's back.

[0050] After the user leaves the seat, under the action of the elastic support member 4, the linkage mechanism 3, the linkage assembly 6 and the seat cushion shell 2 can be driven to return to their original positions.

[0051] In some alternative embodiments, the seat may selectively be provided with armrests 9 on both sides of the seat cushion 8, a footrest in front of the support legs 7, rollers at the bottom of the support legs 7 and other common structures. For the specific settings, reference may be made to the existing solutions for the settings of the armrests 9, the footrest and the rollers, which will not be elaborated herein.

[0052] Finally, it should be noted that the above embodiments are only alternative embodiments of the present utility model, and the scope of protection of the present utility model cannot be limited thereby. Any non-substantive changes and substitutions made by those skilled in the art based on the present utility model fall within the scope of protection required by the present utility model.

Claims

1. A seat, characterized in that, Comprising: A seat frame, which includes a base and a seat cushion shell having an initial position relative to the base; A link mechanism, which is arranged between the seat cushion shell and the base, and the seat cushion shell is swingably arranged relative to the base around a set axis through the link mechanism; An elastic support member, which is arranged between the seat cushion shell and the base through the link mechanism and presses on the seat cushion shell with a tendency for the seat cushion shell to swing towards the initial position; A backrest, which is slidably arranged on the base along a set direction; And, A linkage assembly, which is arranged between the backrest, the base and the link mechanism; Wherein, the set direction is the front - rear direction of the seat, the set axis is in the same direction as the left - right direction of the seat, and the linkage assembly is configured to be driven by the link mechanism to act and drive the backrest to move forward during the swinging process of the seat cushion shell away from the initial position.

2. The seat according to claim 1, wherein The linkage assembly includes a connecting member, the connecting member is fixedly connected to the bottom of the backrest, and a limiting structure for restricting the sliding direction of the connecting member relative to the base is arranged between the base and the connecting member.

3. The seat according to claim 2, characterized in that, The base is a shell formed with a cavity, the limiting structure includes an opening arranged on the rear side wall of the base, the connecting member has a sliding section, the opening is adapted to the outer contour of the sliding section, and the connecting member extends out of the cavity through the opening and slides along the set direction under the limitation of the opening; And / or, the limiting structure includes a limiting chute and a slider slidably arranged in the limiting chute, a connecting frame is arranged in the cavity, the limiting chute is formed on the connecting frame and extends along the set direction, and the slider is fixedly arranged on the part of the connecting member located in the cavity.

4. The seat according to claim 3, wherein, The seat cushion shell extends into the cavity, and there is a clearance fit between the outer surfaces on both sides of the seat cushion shell and the inner walls on both sides of the cavity, and there is a spacing for the seat cushion shell to swing between the outer surface on the rear side of the seat cushion shell and the rear side wall of the cavity.

5. The seat according to claim 2, characterized in that, The linkage assembly further includes a driving member and a transmission member connected to the driving member, the driving member is connected to the link mechanism, the transmission member is connected to the connecting member, and the driving member is configured to be swingable driven by the link mechanism, and the transmission member is configured to be able to act driven by the driving member to drive the connecting member to slide.

6. The seat according to claim 5, characterized in that, The transmission member includes a circular shaft, the circular shaft is configured to be swingable driven by the driving member, the connecting member is provided with a guiding groove, the length direction of the guiding groove intersects with the set direction, and the circular shaft extends into the guiding groove and the two are slidably mated.

7. The seat according to claim 6, characterized in that, The transmission member further includes a connecting shaft, a swing arm and a transmission block, both the swing arm and the transmission block are fixedly arranged on the connecting shaft, the connecting shaft is rotatably arranged on the base, the driving member includes a driving block fixedly arranged on the link mechanism, and the circular shaft is fixedly arranged on the swing arm; The driving block is formed with a driving tooth, the transmission block is formed with a transmission tooth, and the driving block and the transmission block are meshed and transmitted through the driving tooth and the transmission tooth.

8. The seat according to claim 7, characterized in that, The link mechanism includes a first link assembly and a second link assembly. The first link assembly includes a first rotating shaft rotatably arranged on the base and a first swing rod fixedly arranged on the first rotating shaft. One end of the first swing rod away from the first rotating shaft is movably hinged to the seat cushion shell; The second link assembly includes a second rotating shaft rotatably arranged on the base and a second swing rod fixedly arranged on the second rotating shaft. One end of the second swing rod away from the second rotating shaft is movably hinged to the seat cushion shell; The driving block is fixedly arranged on the first rotating shaft.

9. The seat according to claim 8, characterized in that, The elastic support member is a pneumatic rod. One end of the pneumatic rod is movably hinged to the second rotating shaft, and the other end of the pneumatic rod is movably hinged to the connecting shaft.

10. The seat according to any one of claims 1 to 9, characterized in that, The chair back includes a chair back bracket and a support structure arranged on the chair back bracket. The chair back bracket is slidably arranged on the base along a set direction; The support structure is configured to be able to adjust its position relative to the chair back bracket in the height direction of the seat. The support structure includes a support headrest and / or a support backrest and / or a support lumbar support.

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