Seat unit and seat

Abstract

A seat unit and a seat. The seat unit comprises: a pair of mechanical extension apparatuses (100) arranged as mirror images of the other, said apparatuses moving in unison; the mechanical extension apparatuses (100) each comprise a seat assembly (2), a leg assembly (1), and a backrest assembly (3); the seat assembly (2) comprises a seat mount (21) and a seat frame (22) which can slide relative to each other in the front and rear directions of the seat assembly; the leg assembly (1) is pivotally connected to the seat mount (21); the backrest assembly (3) is configured to be simultaneously pivotally connected to the seat mount (21) and the seat frame (22), and when the seat mount (21) slides relative to the seat frame (22), the pivot point between the backrest assembly (3) and the seat mount (21) is able to move along with the seat mount (21); and a first damping member (4), said first damping member (4) preventing the seat mount (21) from sliding towards the front of the seat assembly (2) relative to the seat frame (22) when the seat unit is switched from a sitting orientation to a lying down orientation; and when the seat unit is switched from the lying down orientation to the sitting orientation, the first damping member (4) drives the seat mount (21) to slide towards the rear of the seat assembly (2) relative to the seat frame (22).

Description

Seat unit and seat Technical Field

[0001] The present application relates to the technical field of seats, and in particular to a seat unit and a seat. Background Art

[0002] Most existing functional sofas, functional chairs and other seating units can be adjusted in posture to meet the user's relaxation needs in multiple scenarios. Generally, a seating unit includes three major structures: a leg part and a backrest that are adjustably mounted on the seat part. By adjusting these three major structures, the seating unit can be in a sitting posture, a TV posture and a lying posture, wherein the sitting posture is a folded state, and the lying posture is an extended state, and the TV posture is between the folded state and the extended state. Conventionally, when the seating unit is adjusted from a folded state to an extended state, the legs are required to be adjusted first, and then the backrest is adjusted; when the seating unit is adjusted from an extended state to a folded state, the backrest is required to be adjusted first, and then the legs are adjusted. That is, the three major structures of the seating unit need to meet the above-mentioned order requirements during the posture adjustment process, and disorder will affect the user experience. Moreover, when the seat unit switches between the TV position and the lying position, the backrest tilts backward. When a conventional seat bracket is adjusted in this step, the backrest moves backward a large distance. Therefore, when the seat unit is placed with the backrest facing the wall, a large adjustment space needs to be left between the wall and the backrest of the seat unit, which is inconvenient to use.

[0003] Summary of the Invention

[0004] In a first aspect, the present application provides a chair unit comprising: a pair of mirror-imaged mechanical extension devices, which are linked together, the mechanical extension device comprising a seat assembly for attaching a seat portion, a leg assembly adjustably mounted to the front end of the seat assembly and a backrest assembly adjustably mounted to the rear end of the seat assembly, the seat assembly comprising a seat frame and a seat frame which can slide relative to each other in the front and rear directions of the seat assembly, the seat frame being fixed relative to the ground, the leg assembly being pivotally connected to the seat frame, the backrest assembly being configured to be pivotally connected to the seat frame and the seat frame at the same time, and when the seat frame slides relative to the seat frame, the pivot point between the backrest assembly and the seat frame can Following the movement of the seat frame; a driving unit for driving the mechanical extension device so that the seat unit switches in sequence between a sitting posture, a TV posture and a lying posture, and the seat frame slides relative to the seat frame; and a first damping member, arranged between the seat frame and the seat frame, or between the backrest assembly and the seat frame, wherein, when the seat unit switches from the sitting posture to the lying posture, the first damping member prevents the seat frame from sliding toward the front of the seat assembly relative to the seat frame; when the seat unit switches from the lying posture to the sitting posture, the first damping member drives the seat frame to slide toward the rear of the seat assembly relative to the seat frame.

[0005] The first damping member here makes the seat frame have a large resistance to sliding toward the front of the seat assembly relative to the seat frame under the action of the driving unit, while the resistance to sliding toward the rear of the seat assembly is small, so as to cooperate with the adjustment of the leg assembly to ensure the adjustment sequence of the leg and backrest of the seat unit.

[0006] According to one embodiment, the chair further includes a second damping member disposed between the leg assembly and the seat assembly; when the chair unit switches from the sitting position to the reclining position, the second damping member drives the leg assembly to extend toward the front of the seat assembly; and when the chair unit switches from the reclining position to the TV position, the second damping member prevents the leg assembly from retracting toward the rear of the seat assembly. In some embodiments, the second damping member is disposed between the leg assembly and the seat frame.

[0007] The second damping member here makes it easier for the leg assembly to extend forward when the seat unit switches from the sitting position to the lying position, and the seat unit will encounter a certain resistance when switching from the lying position to the TV position. Combined with the first damping member, the various parts of the seat unit can maintain a stable posture adjustment sequence.

[0008] According to one embodiment, the first damping element is a tension spring or a rubber tube.

[0009] In another embodiment, a chair unit includes: a pair of mirror-image mechanical extension devices, which are linked together, the mechanical extension device including a seat assembly for attaching a seat portion, a leg assembly adjustably mounted to the front end of the seat assembly and a backrest assembly adjustably mounted to the rear end of the seat assembly, the seat assembly including a seat frame and a seat frame that can slide relatively in the front and rear directions of the seat assembly, the seat frame is fixed relative to the ground, the leg assembly is pivotally connected to the seat frame, the backrest assembly is configured to be pivotally connected to the seat frame and the seat frame at the same time, and when the seat frame slides relative to the seat frame, the backrest assembly and the seat frame are pivotally connected. The pivot point can follow the movement of the seat frame; a driving unit for driving the mechanical extension device so that the seat unit switches in sequence between a sitting posture, a TV posture and a lying posture, and the seat frame slides relative to the seat frame; and a second damping member, the second damping member is arranged between the leg assembly and the seat assembly; when the seat unit switches from the sitting posture to the lying posture, the second damping member drives the leg assembly to extend toward the front of the seat assembly; when the seat unit switches from the lying posture to the TV posture, the second damping member prevents the leg assembly from retracting toward the rear of the seat assembly.

[0010] Such a setting can make it easier for the leg assembly of the seat unit to extend forward when switching from a sitting position to a lying position, and the retraction action of the leg assembly of the seat unit will be subject to a certain resistance when switching from a lying position to a TV position, thereby ensuring that the posture movement sequence of the legs of the seat unit is stable during the posture switching process.

[0011] According to one embodiment, it also includes a fixed beam and a driving beam, wherein: the driving beam is used to link the leg components of a pair of the mechanical stretching devices, and the fixed beam is arranged between the seat frames of a pair of the mechanical stretching devices; the driving unit is a telescopic member, the telescopic end of the telescopic member is pivotally connected to the driving beam, and the fixed end of the telescopic member is pivotally connected to the fixed beam.

[0012] According to one embodiment, the backrest assembly includes an active rod and a driven rod pivotally connected, wherein: the active rod is pivotally connected to the seat frame; the driven rod is pivotally connected to the seat frame; and the backrest plate is attached to the active rod.

[0013] According to one embodiment, the backrest assembly includes an active rod, a first driven rod, a second driven rod and a backrest mounting rod, wherein: the lower end of the first driven rod and the lower end of the second driven rod are respectively pivotally connected to the seat frame, and the upper end of the first driven rod and the upper end of the second driven rod are respectively pivotally connected to the backrest mounting rod; the lower end of the active rod is pivotally connected to the seat frame, and the upper end of the active rod is pivotally connected to the first driven rod, the second driven rod or the backrest mounting rod; the backrest plate is attached to the backrest mounting rod; when the seat frame slides relative to the seat frame, the pivot point between the lower end of the active rod and the seat frame can follow the movement of the seat frame.

[0014] With such arrangement, when the seat frame slides relative to the seat frame, that is, when the seat unit switches between the TV posture and the lying posture, the backrest board installed on the backrest mounting rod can adjust the inclination angle of the backrest of the seat unit in such a way that its lower end follows the forward and backward movement of the seat frame while its upper end basically does not move in the forward and backward directions (the upper end of the backrest board moves in the upward and downward directions), thereby reducing the feeling of rubbing the back of the user when using the backrest during this process.

[0015] According to one embodiment, the backrest mounting rod includes a follower portion and an attachment portion that are bent and connected, the first follower rod and the second follower rod are pivotally connected to the follower portion, and the backrest plate is attached to the attachment portion.

[0016] According to one embodiment, a first damping surface is provided on a side of the first driven rod close to the second driven rod, and a second damping surface is provided on a side of the second driven rod close to the first driven rod, and the first damping surface is in frictional contact with the second damping surface.

[0017] Such an arrangement can improve the structural stability of the planar four-bar structure, and specifically can improve the posture stability of the backrest mounting rod during the adjustment process and the repeatability of the posture during multiple adjustments.

[0018] According to one embodiment, the seat unit further includes a third stopper that extends at least partially between the first follower rod and the second follower rod. When the seat unit is in the sitting position and the TV position, the first follower rod abuts the third stopper. When the seat unit is in the lying position, the second follower rod abuts the third stopper. The third stopper is used to assist in limiting the position of the backrest assembly.

[0019] According to one embodiment, a first slide rail member is provided on the seat frame, and a second slide rail member adapted to the first slide rail member is provided on the seat frame; the first slide rail member is slidably connected to the second slide rail member.

[0020] According to one embodiment, the first sliding rail member includes a first base plate, first outer plates are provided on both sides of the first base plate, the free ends of the first outer plates are bent inward to provide a first inner plate, and the first base plate is provided on the seat frame; the second sliding rail member includes a second base plate, second inner plates are provided on both sides of the second base plate, the free ends of the second inner plates are bent outward to provide a second outer plate, and the second base plate is provided on the seat frame; the second base plate and the second inner plate provided on the second base plate are both located between the two first inner plates, and the second outer plate is located between the first outer plate and the first inner plate corresponding to it; a rolling member is provided on the second outer plate, and the rolling member is in rolling or sliding contact with the first base plate and / or the first outer plate.

[0021] According to one embodiment, the rolling member includes a support member provided on the second outer plate, and a rolling body is provided at the lower end of the support member for rolling or sliding contact with the first bottom plate and / or the first outer plate.

[0022] According to one embodiment, the seat frame includes a supporting plate, and side plates are bent on both sides of the supporting plate. The second sliding rail member is arranged on the supporting plate and is located between the two side plates; the first sliding rail member at least partially extends between the two side plates.

[0023] According to one embodiment, the second damping member is any one of a tension spring, a torsion spring or a rubber tube.

[0024] According to one embodiment, a first support and a second support are provided on the seat frame, wherein the first support is provided on a side close to the leg assembly, and the second support is provided on a side close to the backrest assembly.

[0025] According to one embodiment, it also includes a first frame beam and a second frame beam, wherein: the first end of the first frame beam and the first end of the second frame beam are both connected to the seat frame of one of the mechanical stretching devices; the second end of the first frame beam and the second end of the second frame beam are both connected to the seat frame of the other mechanical stretching device; the first frame beam is arranged on the side close to the leg assembly, and the second frame beam is arranged on the side close to the backrest assembly.

[0026] According to one embodiment, a plurality of hooks are respectively integrally stamped on the first frame beam and the second frame beam; the seat unit further includes a serpentine spring, one end of the serpentine spring is hooked on the hook of the first frame beam, and the other end of the serpentine spring is hooked on the corresponding hook on the second frame beam.

[0027] According to one embodiment, the leg assembly includes a driving link, a follower link, a first extension link, a second extension link and a footrest, wherein: the first end of the driving link and the follower link are both pivotally connected to the seat frame, the second end of the driving link is pivotally connected to the first end of the first extension link, and the follower link is pivotally connected to the first end of the second extension link; the second end of the first extension link and the second end of the second extension link are respectively pivotally connected to the footrest; the driving link and the second extension link are pivotally connected, and the pivot point of the two is between the two ends of the second extension link; the two ends of the driving beam are respectively connected to the corresponding driving links.

[0028] According to one embodiment, the leg assembly also includes a first limit member, which is arranged on the second extension link, defining the pivot point between the second extension link and the driving link as a first pivot point, and the first limit member is located between the first end of the second extension link and the first pivot point.

[0029] According to one embodiment, the pivot point between the follower link and the seat frame is defined as a second pivot point, and the second pivot point is located between the two end points of the follower link. One end of the follower link is pivotally connected to the second extension link, the other end of the follower link is pivotally connected to the front end of the transition link, and the front end of the second damping member is connected to the rear end of the transition link. This arrangement ensures that the second damping member always extends generally in the fore-and-aft direction during the seat unit posture adjustment process, facilitating assembly and preventing bending of the second damping member due to rotation of the follower link after direct assembly with the follower link, thereby reducing the lifespan of the second damping member.

[0030] According to one embodiment, the pivot point between the driving link and the seat frame is defined as a third pivot point, and the second pivot point is disposed close to one side of the backrest assembly.

[0031] According to one embodiment, a motor bracket is provided on the drive beam, and the telescopic end of the telescopic member is pivotally connected to the motor bracket. The pivot point between the telescopic end of the telescopic member and the motor bracket is defined as a fourth pivot point. When the seat unit is in the TV posture and the lying posture, the fourth pivot point is located behind the drive beam; when the seat unit is in the sitting posture, the fourth pivot point is located below the drive beam. This arrangement allows the connection point between the telescopic member and the leg assembly to be moved forward, which can better support the leg assembly and reduce the risk of the leg assembly falling when the seat unit is in the TV posture and the lying posture.

[0032] According to one embodiment, a second limiter is provided on the seat frame; when the seat unit switches from the TV posture to the sitting posture, the leg assembly is retracted toward the rear of the seat assembly and abuts against the second limiter to maintain the sitting posture; when the seat unit switches from the sitting posture to the TV posture, the leg assembly is extended toward the front of the seat assembly and disengaged from the second limiter.

[0033] According to one embodiment, when the seat frame slides forward relative to the seat frame, at least a portion of the backrest assembly can follow the seat frame's forward movement, with the highest point of the backrest assembly tending to move downward and forward. This allows the seat unit to have a low space requirement behind the backrest during installation, meaning that the seat unit occupies little space behind the backrest during posture adjustment.

[0034] In a second aspect, the present application provides a chair comprising the aforementioned chair unit, wherein the posture adjustment process is sequentially stable and the comfort level is high.

[0035] In a third aspect, the present application provides a chair frame, comprising a driving member and two mirror-imaged and linked mechanical extension devices, wherein the mechanical extension device comprises: a seat assembly, comprising a seat frame and a seat frame, the seat frame being arranged on the seat frame and being slidable relative to the seat frame; a leg assembly, being adjustably pivotally connected to the seat frame; a backrest assembly, being configured to be pivotally connected to the seat frame and the seat frame at the same time, and when the seat frame slides relative to the seat frame, the pivot point between the backrest assembly and the seat frame can follow the movement of the seat frame, and the highest point of the backrest assembly can have a movement tendency to follow the movement of the seat frame in the horizontal direction; when the seat frame slides forward relative to the seat frame, the highest point of the backrest assembly has a movement tendency to approach the ground in the longitudinal direction; when the seat frame slides backward relative to the seat frame, the highest point of the backrest assembly has a movement tendency to move away from the ground in the longitudinal direction; the driving member comprises: a first driving unit, arranged on the seat frame, for driving the leg assembly to adjust the posture; a second driving unit, arranged on the seat frame, for driving the seat frame to slide relative to the seat frame.

[0036] This movement tendency exhibited by the highest point of the backrest assembly causes the seat unit formed by the seat frame to exhibit a significant tendency for the lower end of the backrest, which is primarily composed of the backrest assembly, to move forward and tilt backward in the forward and rearward directions during posture adjustment, specifically when switching from a TV posture to a reclining posture. This reduces the space requirement behind the backrest during installation, meaning that the seat unit occupies less space behind the backrest during posture adjustment. In actual use, when the backrest is placed toward a wall, the seat unit can be placed closer to the wall without affecting its posture adjustment, saving space.

[0037] According to one embodiment, when the seat frame slides forward relative to the seat frame, the forward movement tendency of the pivot point between the backrest assembly and the seat frame is greater than the forward movement tendency of the highest point of the backrest assembly.

[0038] According to one embodiment, the backrest assembly includes an active rod, a first driven rod, a second driven rod and a backrest mounting rod, wherein: the lower end of the first driven rod and the lower end of the second driven rod are respectively pivotally connected to the seat frame, and the upper end of the first driven rod and the upper end of the second driven rod are respectively pivotally connected to the backrest mounting rod; the lower end of the active rod is pivotally connected to the seat frame, and the upper end of the active rod is pivotally connected to the first driven rod, the second driven rod or the backrest mounting rod; the backrest plate is attached to the backrest mounting rod; when the seat frame slides relative to the seat frame, the pivot point between the lower end of the active rod and the seat frame can follow the movement of the seat frame.

[0039] According to one embodiment, the backrest mounting rod includes a follower portion and an attachment portion that are bent and connected, the first follower rod and the second follower rod are pivotally connected to the follower portion, and the backrest plate is attached to the attachment portion.

[0040] According to one embodiment, the active rod includes a front end rod and a rear end rod connected to each other, wherein: the front end rod is connected to the seat frame, and the rear end rod is connected to the first driven rod; the extension direction of the front end rod and the extension direction of the rear end rod are set at an angle so that the active rod is V-shaped with the opening facing upward.

[0041] According to one embodiment, the front end rod includes a first connecting portion and a first extension portion that are bent; the rear end rod includes a second connecting portion and a second extension portion that are bent; the first extension portion is connected to the second extension portion, the first connecting portion is connected to the seat frame, and the second connecting portion is connected to the first driven rod; the first connecting portion is arranged closer to the seat frame than the first extension portion; the second connecting portion is arranged closer to the first driven rod than the second extension portion.

[0042] According to one embodiment, the front end rod and the rear end rod are integrally formed.

[0043] According to one embodiment, the seat bracket further includes a limit member, which at least partially extends between the first follower rod and the second follower rod; when the seat unit is in the sitting posture and the TV posture, the first follower rod abuts against the limit member; when the seat unit is in the lying posture, the second follower rod abuts against the limit member.

[0044] In a fourth aspect, the present application provides a seat unit comprising the above-mentioned seat bracket, which requires little space behind the backrest during the backrest tilt adjustment process, thereby facilitating the arrangement and use of the seat unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG1 is a front view structural diagram of a seat unit provided in a first embodiment of the present application in a sitting position;

[0046] FIG2 is a schematic diagram of the three-dimensional structure of the seat unit provided in the first embodiment of the present application in a sitting position;

[0047] FIG3 is a front view structural diagram of the seat unit provided in the first embodiment of the present application in a TV posture;

[0048] FIG4 is a schematic diagram of the three-dimensional structure of the seat unit provided in the first embodiment of the present application in a TV posture;

[0049] FIG5 is a front view structural diagram of the seat unit provided in the first embodiment of the present application in a lying position;

[0050] FIG6 is a schematic diagram of the three-dimensional structure of the seat unit provided in the first embodiment of the present application in a lying position;

[0051] FIG7 is a first three-dimensional structural diagram of the mechanical extension device provided in Example 1 of the present application when the seat unit is in a lying position;

[0052] FIG8 is a second three-dimensional structural diagram of the mechanical extension device provided in the first embodiment of the present application when the seat unit is in a lying position;

[0053] FIG9 is a schematic three-dimensional structural diagram of the mechanical extension device provided in Example 1 of the present application when the seat unit is in a sitting position;

[0054] FIG10 is a schematic diagram of the assembly structure of the seat frame and the seat frame provided in Example 1 of the present application;

[0055] FIG11 is a schematic diagram of the exploded structure of the first slide rail member and the second slide rail member provided in Example 1 of the present application;

[0056] FIG12 is a schematic diagram of the three-dimensional structure of the seat support provided in the second embodiment of the present application when in a sitting position;

[0057] FIG13 is a schematic diagram of the three-dimensional structure of the seat support provided in the second embodiment of the present application when it is in the TV posture;

[0058] FIG14 is a schematic diagram of the three-dimensional structure of the seat support provided in the second embodiment of the present application when it is in a lying position;

[0059] FIG15 is a schematic diagram of a first three-dimensional structure of a mechanical stretching device provided in Example 2 of the present application;

[0060] FIG16 is a schematic diagram of a second three-dimensional structure of the mechanical stretching device provided in Example 2 of the present application;

[0061] FIG17 is a schematic diagram of a three-dimensional structure of the second driving unit driving the seat frame to slide relative to the seat frame provided in the second embodiment of the present application;

[0062] FIG18 is a schematic diagram of the three-dimensional structure of the active rod provided in Example 2 of the present application.

[0063] Icons: 100-mechanical extension device, 200-driving unit, 1-leg assembly, 11-follow-up link, 12-driving link, 13-first extension link, 14-second extension link, 15-first limit member, 16-footrest, 17-transition link, 2-seat assembly, 201, first driving unit, 202, second driving unit, 21-seat frame, 210-support plate, 211-side plate, 212-second limit member, 22-seat frame, 221-first support, 222-second support, 23-first slide rail member, 230-first bottom plate, 231-first outer plate, 232-first inner plate, 233-rounded surface, 24-second slide rail member, 240-second bottom plate, 241-second inner plate, 242-second outer plate, 25-rolling member, 250-support member, 251- Rolling body, 26-first seat plate, 27-second seat plate, 271-third limiter, 281-first frame beam, 282-second frame beam, 283-hook, 29, seat plate, 291, limiter, 3-backrest assembly, 31-active rod, 311-front end rod, 3111-first connecting portion, 3112-first extension portion, 312-rear end rod, 3121, second first connecting portion, 3122, second extension portion, 32-first driven rod, 33-second driven rod, 34-backrest mounting rod, 341-follower portion, 342-attachment portion, 4-first damping member, 5-second damping member, 6-backrest plate, 7-drive beam, 71-motor bracket, 8-fixed beam, 9, first fork frame, 10, second fork frame, a-first pivot point, b-second pivot point, c-third pivot point, d-fourth pivot point. DETAILED DESCRIPTION

[0064] Example 1:

[0065] Please refer to Figures 1 to 6. A seat unit includes a pair of mirror-imaged mechanical extension devices 100, a drive unit 200 and a first damping member 4. The two mechanical extension devices 100 are linked. The pair of mechanical extension devices here constitute the main structure of the seat unit, and the seat unit is composed of a seat part (not shown in the figure), a footrest board (not shown in the figure) and a backrest board 6. The first damping member 4 cooperates with the drive unit 200 to realize the sequential adjustment of the mechanical extension device 100 to ensure that the seat unit avoids disorder during the posture adjustment process.

[0066] Specifically, two mechanical extension devices 100 are linked. As shown in Figures 7 and 8 , each mechanical extension device 100 includes a seat assembly 2 for attaching a seat portion, a leg assembly 1 adjustably mounted to the front end of the seat assembly 2, and a backrest assembly 3 adjustably mounted to the rear end of the seat assembly 2. A footrest plate is attached to the leg assembly 1, and a backrest plate 6 is attached to the backrest assembly 3. Optionally, the same footrest plate is attached to both leg assemblies 1 of the two mechanical extension devices 100, and the same backrest plate 6 is attached to both backrest assemblies 3 of the two mechanical extension devices 100.

[0067] In this embodiment, the seat assembly 2 includes a seat frame 21 and a seat frame 22 that are slidable relative to each other in the front-to-rear direction of the seat assembly 2. The seat frame 22 is fixed relative to the ground. The leg assembly 1 is pivotally connected to the seat frame 21. The backrest assembly 3 is configured to be pivotally connected to both the seat frame 21 and the seat frame 22. When the seat frame 21 slides relative to the seat frame 22, the pivot point between the backrest assembly 3 and the seat frame 21 can follow the movement of the seat frame 21. In this embodiment, the drive unit 200 is used to drive the mechanical extension device 100 to sequentially switch the seat unit between a sitting position, a TV position, and a reclining position, and the seat frame 21 slides relative to the seat frame 22. Specifically, the seat frame 21 slides relative to the seat frame 22 when the seat unit switches from a sitting position to a reclining position, or vice versa.

[0068] As shown in Figures 4, 6, and 7, the first damping member 4 is disposed between the seat frame 21 and the seat frame 22. When the seat unit switches from a sitting position to a reclining position, the first damping member 4 prevents the seat frame 21 from sliding forward relative to the seat frame 22 toward the front of the seat assembly 2. When the seat unit switches from a reclining position to a sitting position, the first damping member 4 drives the seat frame 21 to slide backward relative to the seat frame 22 toward the rear of the seat assembly 2. This arrangement ensures that, under the action of the drive unit 200, the seat frame 21 experiences greater resistance to sliding forward relative to the seat frame 22 toward the front of the seat assembly 2, while experiencing less resistance to sliding backward relative to the seat assembly 2. This ensures that the leg and backrest portions of the seat unit are adjusted in the order in which they are adjusted in conjunction with the leg assembly 1.

[0069] In this embodiment, the first damping member 4 causes the seat frame 21 to have a tendency to slide rearward of the seat assembly 2 relative to the seat frame 22 .

[0070] Optionally, the first damping member 4 is a tension spring or a rubber tube. In some embodiments, the first damping member 4 is a tension spring. As shown in Figure 7, a first seat plate 26 is provided on the seat frame 21, and a second seat plate 27 is provided on the seat frame 22. The front end of the tension spring is hooked to the first seat plate 26, and the rear end of the tension spring is hooked to the second seat plate 27. When the seat unit is in a sitting posture and a TV posture, there is no relative sliding between the seat frame 21 and the seat frame 22. At this time, the first damping member 4, that is, the tension spring, is in a first stretched state. When the seat unit switches from a TV posture to a lying posture, the first damping member 4, that is, the tension spring, is further stretched so that it is in a second stretched state.

[0071] In another embodiment, the first damping member 4 may also be disposed between the backrest assembly 3 and the seat frame 22. In this embodiment, the pivot point between the backrest assembly 3 and the seat frame 21 can move along with the seat frame 21. That is, in the front-rear direction of the seat assembly 2, at least a portion of the backrest assembly 3 can move forward as the seat frame 21 slides toward the front of the seat assembly 2, or move backward as the seat frame 21 slides toward the rear of the seat assembly 2. This allows the first damping member 4 to act on the seat frame 21 through the backrest assembly 3, causing it to have a tendency to slide backward relative to the seat frame 22.

[0072] In this embodiment, when the seat frame 21 slides forward relative to the seat frame 22, at least a portion of the backrest assembly 3 can follow the forward movement of the seat frame 21, with the highest point of the backrest assembly 3 exhibiting a downward and forward movement tendency. It should be noted that this downward and forward movement tendency of the highest point of the backrest assembly 3 does not preclude a temporary or slight rearward movement of the backboard 6 or the highest point of the backrest assembly 3 during this process. In other words, the downward and forward movement tendency of the highest point of the backrest assembly 3 herein represents the overall tendency exhibited during the forward sliding movement of the seat frame 21 relative to the seat frame 22. This movement tendency exhibited by the highest point of the backboard 6 or the backrest assembly 3 causes the backrest portion, formed by the backrest assembly 3 attached to the backboard 6, to exhibit a significant forward movement and rearward tilt in the forward and rearward directions during posture adjustment of the seat unit, specifically, when switching from a TV posture to a reclining posture. This reduces the space requirement behind the backrest portion during installation of the seat unit, meaning that the seat unit occupies less space behind the backrest portion during posture adjustment. During actual use, when the backrest is placed towards the wall, the seat unit can be placed closer to the wall without affecting its posture adjustment, saving space.

[0073] Specifically, as shown in Figures 3 to 8, the backrest assembly 3 includes an active rod 31, a first driven rod 32, a second driven rod 33, and a backrest mounting rod 34. The lower ends of the first driven rod 32 and the second driven rod 33 are respectively pivotally connected to the seat frame 22, while the upper ends of the first driven rod 32 and the upper ends of the second driven rod 33 are respectively pivotally connected to the backrest mounting rod 34. The lower end of the active rod 31 is pivotally connected to the seat frame 21, while the upper end of the active rod 31 is pivotally connected to either the first driven rod 32, the second driven rod 33, or the backrest mounting rod 34. The backrest plate 6 is attached to the backrest mounting rod 34. In this embodiment, the lower ends of the first driven rod 32 and the lower ends of the second driven rod 33 are respectively pivotally connected to the second seat plate 27. The first driven rod 32, the second seat plate 27, the second driven rod 33, and the backrest mounting rod 34 constitute a planar four-bar linkage. In some embodiments, the upper end of the active rod 31 is pivotally connected to the first driven rod 32, and the first driven rod 32 is arranged on a side close to the leg assembly 1. When the seat frame 21 slides relative to the seat frame 22, the pivot point between the lower end of the active rod 31 and the seat frame 21 can follow the movement of the seat frame 21. With this arrangement, when the seat frame 21 slides relative to the seat frame 22, that is, when the seat unit switches between the TV posture and the lying posture, the backrest board 6 mounted on the backrest mounting rod 34 can adjust the inclination angle of the backrest of the seat unit in a manner such that its lower end follows the seat frame 21 to move forward and backward while its upper end basically does not move in the forward and backward directions (the upper end of the backrest board 6 moves in the upward and downward directions), thereby reducing the back-rubbing feeling of the user when using the backrest during this process.

[0074] The first follower rod 32, the second seat plate 27, the second follower rod 33 and the backrest mounting rod 34 here constitute a planar four-bar mechanism structure that is stable and firm. It is convenient to adjust the inclination angle of the backrest board 6 or the backrest of the seat unit or the inclination adjustment speed of the backrest by adjusting the length of each side of the planar four-bar mechanism to match the forward and backward movement speed of the seat part, thereby achieving the purpose of better reducing or even eliminating the back-rubbing feeling.

[0075] In this embodiment, a third stopper 271 is provided on the seat frame 22 or the second seat plate 27. The third stopper 271 extends at least partially between the first follower rod 32 and the second follower rod 33. When the seat unit is in the sitting position or the TV position, the first follower rod 32 abuts against the third stopper 271; when the seat unit is in the reclining position, the second follower rod 33 abuts against the third stopper 271. The third stopper 271 serves to assist in limiting the position of the backrest assembly 3.

[0076] In some embodiments, as shown in FIG7 , a first damping surface is provided on the side of the first follower rod 32 proximate to the second follower rod 33, and a second damping surface is provided on the side of the second follower rod 33 proximate to the first follower rod 32. The first damping surface and the second damping surface are in frictional contact. During adjustment of the backrest assembly 3, the first damping surface and the second damping surface slide relative to each other. This arrangement can improve the structural stability of the planar four-bar structure. Specifically, it can improve the posture stability of the backrest mounting rod 34 during adjustment and the repeatability of the posture over multiple adjustments.

[0077] As shown in FIG. 8 , the backrest mounting rod 34 includes a bent follower portion 341 and an attachment portion 342 . The first follower rod 32 and the second follower rod 33 are pivotally connected to the follower portion 341 , respectively. The backrest board 6 is attached to the attachment portion 342 .

[0078] In this embodiment, the attachment portion 342 is located outside the follower portion 341 and is used to avoid the active rod 31.

[0079] In this embodiment, the active rod 31 includes a front end rod 311 and a rear end rod 312 connected to each other, wherein the front end rod 311 is connected to the seat frame 21, and the rear end rod 312 is connected to the first driven rod 32. The extension direction of the front end rod 311 and the extension direction of the rear end rod 312 are set at an angle so that the active rod 31 is V-shaped with the opening facing upward.

[0080] In some embodiments, the front rod 311 includes a bent first connecting portion 3111 and a first extending portion 3112. The first extending portion 3112 is connected to the rear rod 312, and the first connecting portion 3111 is connected to the seat frame 21. Specifically, the first extending portion 3112 is positioned closer to the inside of the seat frame 21 than the first connecting portion 3111, thereby reducing the contact area between the front rod 311 and the seat frame 21 and reducing the possibility of interference between the front rod 311 and the seat frame 21.

[0081] In some embodiments, the front rod 311 and the rear rod 312 are integrally formed.

[0082] In another embodiment, the backrest assembly 3 includes a pivotally connected active rod 31 and a driven rod, wherein: the active rod 31 is pivotally connected to the seat frame 21; the driven rod is pivotally connected to the seat frame 22; and the backrest board 6 is attached to the active rod 31. In this embodiment, there is only one active rod 31 and one driven rod. The upper end of the active rod 31 is pivotally connected to the upper end of the driven rod, the lower end of the active rod 31 is pivotally connected to the seat frame 21, and the lower end of the driven rod is connected to the seat frame 22. The lower end of the active rod 31 moves forward and backward with the seat frame 21. During this process, the forward and backward movement of the lower end of the active rod 31 is faster than the forward and backward movement of the upper end of the active rod 31. Therefore, the backrest board 6 mounted on the active rod 31 can follow the active rod 31 to achieve rearward adjustment of the reclining angle.

[0083] In this embodiment, as shown in Figures 1 to 9, the seat unit also includes a second damping member 5, which is arranged between the leg assembly 1 and the seat assembly 2; when the seat unit switches from a sitting position to a lying position, the second damping member 5 drives the leg assembly 1 to extend toward the front of the seat assembly 2; when the seat unit switches from a lying position to a TV position, the second damping member 5 prevents the leg assembly 1 from retracting toward the rear of the seat assembly 2. The second damping member 5 here makes it easier for the leg assembly 1 to extend forward when the seat unit switches from a sitting position to a lying position, while the seat unit will encounter a certain resistance when switching from a lying position to a TV position. In conjunction with the first damping member 4, the various parts of the seat unit can maintain a stable posture adjustment sequence, that is, when the seat unit is adjusted from a folded state to an extended state, the leg assembly 1 or the leg is first adjusted to the TV position as shown in Figures 3 and 4, and then the backrest assembly 3 or the backrest begins to adjust to the lying position as shown in Figures 5 and 6; when the seat unit is adjusted from an extended state to a folded state, the backrest assembly 3 or the backrest is first adjusted to the TV position as shown in Figures 3 and 4, and then the leg assembly 1 or the leg is adjusted to the sitting position as shown in Figures 1 and 2. In some embodiments, the second damping member 5 is arranged between the leg assembly 1 and the seat frame 21. In other embodiments, optionally, the second damping member 5 is arranged between the leg assembly 1 and the seat frame 22.

[0084] In this embodiment, the seat unit further includes a drive beam 7, which is used to link the leg assemblies 1 of a pair of mechanical extension devices 100. Specifically, as shown in Figures 7 and 8, the leg assembly 1 includes a drive link 12, a follower link 11, a first extension link 13, a second extension link 14, and a footrest 16. The first end of the drive link 12 and the follower link 11 are both pivotally connected to the seat frame 21, the second end of the drive link 12 is pivotally connected to the first end of the first extension link 13, and the follower link 11 is pivotally connected to the first end of the second extension link 14. The second end of the first extension link 13 and the second end of the second extension link 14 are each pivotally connected to the footrest 16. The drive link 12 and the second extension link 14 are pivotally connected, with their pivot point located between the two ends of the second extension link 14. The drive beam 7 has two ends connected to the corresponding drive link 12. In this embodiment, the drive link 12 links the two leg assemblies 1 of the two mirror-imaged mechanical extension devices 100. It should be noted that in this embodiment, any component of the leg assembly 1 directly connected to the drive beam 7 can be referred to as the "drive link 12." The connection structure shown in the figures is exemplary only, and in some embodiments, the principle is to be able to drive the leg assembly 1 to extend and retract forward without interfering with other structural components. In other words, in other embodiments, if necessary, the drive beam 7 can also be assembled to the follower link 11, first extension link 13, or second extension link 14 in this embodiment.

[0085] In this embodiment, the leg assembly 1 can be any existing leg assembly 1 including the driving link 12 , the follower link 11 , the first extension link 13 , the second extension link 14 and the footrest 16 in this embodiment.

[0086] In this embodiment, the leg assembly 1 further includes a first stopper 15, which is disposed on the second extension link 14. The pivot point between the second extension link 14 and the drive link 12 is defined as a first pivot point a. The first stopper 15 is located between the first end of the second extension link 14 and the first pivot point a. During use, when the seat unit is in a sitting position, a TV position, and a reclining position, the drive link 12 abuts against the first stopper 15 to maintain the stability of the seat unit in these three positions. The first stopper 15 is cylindrical in shape, and its coordination with the drive link 12 and the follower link 11 is conventional and will not be further described here.

[0087] Optionally, the second damping member 5 is any one of a tension spring, a torsion spring or a rubber tube. In some embodiments, the second damping member 5 is a tension spring. In some embodiments, as shown in Figure 7, in some embodiments, the second damping member 5 acts on the follower link 11.

[0088] Specifically, the pivot point between the follower link 11 and the seat frame 21 is defined as the second pivot point b, located between the two end points of the follower link 11. One end of the follower link 11 is pivotally connected to the second extension link 14, and the other end of the follower link 11 is pivotally connected to the front end of the transition link 17. The front end of the second damping member 5 is hooked to the rear end of the transition link 17. This arrangement ensures that the second damping member 5 always extends generally in the fore-and-aft direction during seat unit posture adjustment, facilitating assembly and preventing bending of the second damping member 5 due to rotation of the follower link 11 after direct assembly with the follower link 11, which could affect the life of the second damping member 5.

[0089] In this embodiment, in the TV posture, the end portion of the follower link 11 close to the backrest assembly 3 is bent toward the inner side of the seat frame 21 to prevent the second damping member 5 from interfering with the seat frame 21 .

[0090] In other embodiments, optionally, an end of the follower link 11 away from the second extension link 14 is provided with a hanging shaft extending toward the inner side of the seat frame 21, and the second damping member 5, ie, the tension spring, is hooked to the hanging shaft.

[0091] In another embodiment, a torsion spring is disposed on the outer sleeve of the pivot shaft between the follower link 11 and the seat frame 21, with one end of the torsion spring abutting the follower link 11 and the other end abutting the seat frame 21. It should be noted that when the leg assembly 1 is retracted backward, the torsion spring stores energy to provide a resisting force to the leg assembly 1, and when the leg assembly 1 is extended forward, the torsion spring releases energy to provide a driving force to the leg assembly 1.

[0092] In this embodiment, as shown in FIG9 , a second stopper 212 is provided on the seat frame 21. When the seat unit switches from a TV posture to a sitting posture, the leg assembly 1 retracts toward the rear of the seat assembly 2 and abuts against the second stopper 212 to maintain the sitting posture. When the seat unit switches from a sitting posture to a TV posture, the leg assembly 1 extends toward the front of the seat assembly 2 and disengages from the second stopper 212. Optionally, the second stopper 212 is a cylindrical protrusion extending toward the inside of the seat frame 21. The first stopper 15 and the second stopper 212 work together to ensure the structural stability of the seat unit when in the sitting posture.

[0093] In this embodiment, the pivot point between the driving link 12 and the seat frame 21 is defined as the third pivot point c, and the second pivot point b is disposed close to one side of the backrest assembly 3. That is, the second pivot point b is located behind the third pivot point c.

[0094] In this embodiment, as shown in Figures 2, 4, and 6, the seat unit further includes a fixed beam 8, wherein the fixed beam 8 is disposed between the seat frame 22 of a pair of mechanical extension devices 100; the drive unit 200 is a telescopic member, the telescopic end of the telescopic member being pivotally connected to the drive beam 7, and the fixed end of the telescopic member being pivotally connected to the fixed beam 8. In some embodiments, the telescopic member is a linear electric actuator.

[0095] In some embodiments, as shown in FIG6 , a motor bracket 71 is provided on the drive beam 7, and the telescopic end of the telescopic member is pivotally connected to the motor bracket 71. The pivot point between the telescopic end of the telescopic member and the motor bracket 71 is defined as a fourth pivot point d. When the seat unit is in the TV posture or the reclining posture, the fourth pivot point d is located behind the drive beam 7; when the seat unit is in the sitting posture, the fourth pivot point d is located below the drive beam 7. This arrangement moves the connection point between the telescopic member and the leg assembly 1 forward, providing more favorable support for the leg assembly 1 and reducing the risk of the leg assembly 1 falling when the seat unit is in the TV posture or the reclining posture.

[0096] In this embodiment, a first slide rail member 23 is provided on the seat frame 22 , and a second slide rail member 24 adapted to the first slide rail member 23 is provided on the seat frame 21 ; the first slide rail member 23 and the second slide rail member 24 are slidably connected.

[0097] In some embodiments, as shown in Figures 10 and 11, the first slide member 23 includes a first bottom plate 230, and first outer plates 231 are provided on both sides of the first bottom plate 230. The free end of the first outer plate 231 is bent inwardly to form a first inner plate 232, and the first bottom plate 230 is provided on the seat frame 22; the second slide member 24 includes a second bottom plate 240, and second inner plates 241 are provided on both sides of the second bottom plate 240. The free end of the second inner plate 241 is bent outwardly. A second outer plate 242 is provided, and a second base plate 240 is provided on the seat frame 21. The second base plate 240 and the second inner plate 241 provided on the second base plate 240 are both located between the two first inner plates 232, and the second outer plate 242 is located between its corresponding first outer plate 231 and first inner plate 232. A rolling member 25 is provided on the second outer plate 242, and the rolling member 25 rolls or slides against the first base plate 230 and / or the first outer plate 231. Here, the first base plate 230, the first outer plate 231, and the first inner plate 232 are integrally formed, and the second base plate 240, the second inner plate 241, and the second outer plate 242 are integrally formed. A rounded surface 233 is provided on the inner side of the transition between the first base plate 230 and the first outer plate 231, and the rolling member 25 rolls against the rounded surface 233.

[0098] In this embodiment, the rolling member 25 includes a support member 250 mounted on the second outer plate 242. A rolling element 251 is disposed at the lower end of the support member 250, configured to engage in rolling or sliding contact with the first base plate 230 and / or the first outer plate 231. The rolling element 251 is spherical and rotatably mounted to the lower end of the support member 250. During use, the rolling element 251 rolls along the radiused surface 233 along the extension direction of the first base plate 230, thereby enabling relative movement of the seat frame 21 and the seat frame 22 in the fore-and-aft directions.

[0099] As shown in Figure 10, the seat frame 21 includes a supporting plate 210, and the supporting plate 210 is bent on both sides with side plates 211. The second slide member 24 is arranged on the supporting plate 210 and is located between the two side plates 211; the first slide member 23 at least partially extends between the two side plates 211. In this embodiment, the structures of the two side plates 211 can be the same or different, and no specific restrictions are made here. The structural design that the first slide member 23 at least partially extends between the two side plates 211 enables the side plates 211 to block the gap between the first slide member 23 and the second slide member 24, which is highly safe.

[0100] In this embodiment, the first seat plate 26 is disposed on the inner side plate 211 of the seat frame 21 .

[0101] In this embodiment, the seat frame 22 is provided with a first support 221 and a second support 222. The first support 221 is provided on the side close to the leg assembly 1, and the second support 222 is provided on the side close to the backrest assembly 3. The first support 221 and the second support 222 are used to cooperate with the supporting legs (not shown) to support and fix the seat frame 22 to the ground.

[0102] As shown in Figures 2, 4, and 6, in this embodiment, the seat unit further includes a first frame beam 281 and a second frame beam 282. The first end of the first frame beam 281 and the first end of the second frame beam 282 are both connected to the seat frame 21 of one mechanical extension device 100; the second end of the first frame beam 281 and the second end of the second frame beam 282 are both connected to the seat frame 21 of the other mechanical extension device 100. The first frame beam 281 is positioned proximate to the leg assembly 1, while the second frame beam 282 is positioned proximate to the backrest assembly 3. In some embodiments, the first frame beam 281 and the second frame beam 282 are each integrally stamped with a plurality of hooks 283. The seat unit further includes a serpentine spring (not shown), one end of which is hooked to the hook 283 of the first frame beam 281, and the other end of which is hooked to a corresponding hook 283 on the second frame beam 282. These serpentine springs, serving as the seat cover, provide excellent shock absorption and effectively enhance the comfort of the seat unit. In this embodiment, the structure of the serpentine spring, the seat frame 21, the first frame beam 281 and the second frame beam 282 can refer to a sofa seat frame 21 disclosed in the Chinese patent publication number CN212117668U, wherein the seat frame 21 corresponds to the longitudinal beam in the prior art, the first frame beam 281 and the second frame beam 282 correspond to the horizontal beam in the prior art, and the serpentine spring corresponds to the supporting elastic member in the prior art. Its specific structure and working principle will not be repeated here.

[0103] This embodiment also provides a seat, comprising the aforementioned seat unit, wherein the seat posture adjustment process is sequentially stable and highly comfortable.

[0104] Example 2:

[0105] 12 to 18 , a chair support includes a drive member 200 and two mirror-imaged and linked mechanical extension devices 100. The mechanical extension device 100 is connected to a seat assembly 2 of a seat portion, a leg assembly 1 attached to a footrest, and a backrest assembly 3 attached to a backrest board 6. The seat assembly 2 includes a seat frame 22 and a seat frame 21. The seat frame 21 is disposed on the seat frame 22 and can slide relative to the seat frame 22. The leg assembly 1 is adjustably pivotally connected to the seat frame 21. The backrest assembly 3 is configured to simultaneously engage with the seat frame 21. It is pivotally connected to the seat frame 22, and when the seat frame 21 slides relative to the seat frame 22, the pivot point between the backrest assembly 3 and the seat frame 21 can move with the seat frame 21, and the highest point of the backrest assembly 3 can have a movement tendency in the horizontal direction to move with the seat frame 21; when the seat frame 21 slides forward relative to the seat frame 22, the highest point of the backrest assembly 3 has a movement tendency close to the ground in the longitudinal direction; when the seat frame 21 slides backward relative to the seat frame 22, the highest point of the backrest assembly 3 has a movement tendency away from the ground in the longitudinal direction.

[0106] It should be noted that the tendency of the highest point of the backrest assembly 3 to move longitudinally toward the ground (downward) and horizontally forward as the seat frame 21 slides forward relative to the seat frame 22 does not preclude a temporary or slight rearward movement of the highest point of the backrest board 6 or the backrest assembly 3 during this process. In other words, the downward and forward movement of the highest point of the backrest assembly 3 herein represents the overall trend exhibited during the forward sliding process of the seat frame 21 relative to the seat frame 22. This movement tendency exhibited by the highest point of the backrest board 6 or the backrest assembly 3 causes the backrest portion of the seat unit formed by the seat frame, comprising the backrest assembly 3 attached to the backrest board 6, to exhibit a significant tendency to move forward at its lower end and tilt backward in the fore-and-aft directions during posture adjustment, specifically, when switching from a TV posture to a reclining posture. This reduces the space requirement behind the backrest portion of the seat unit during installation, meaning that the seat unit occupies less space behind the backrest portion during posture adjustment. During actual use, when the backrest is placed towards the wall, the seat unit can be placed closer to the wall without affecting its posture adjustment, saving space.

[0107] In some embodiments, the drive member 200 includes a first drive unit 201 and a second drive unit 202. The first drive unit 201 is disposed on the seat frame 21 and is used to drive the leg assembly 1 for posture adjustment. The second drive unit 202 is disposed on the seat frame 22 and is used to drive the seat frame 21 to slide relative to the seat frame 22. Both the first drive unit 201 and the second drive unit 202 can be linear actuators. The first drive unit 201 and the second drive unit 202 operate independently to drive the seat frame for posture adjustment. Specifically, as shown in Figures 12 to 14, the first drive unit 201 drives the leg assembly 1 to extend forward, causing the seat frame to switch from a sitting posture as shown in Figure 12 to a TV posture as shown in Figure 13. In some embodiments, the second drive unit 202 drives the seat frame 21 to slide forward relative to the seat frame 22, causing the seat frame to switch from a TV posture as shown in Figure 13 to a reclining posture as shown in Figure 14.

[0108] In this embodiment, as shown in Figures 12 to 17, two mirror-imaged mechanical extension devices 100 are linked. Specifically, the seat frame further includes a driving beam 7, a fixed beam 8, a first frame beam 281, and a second frame beam 282. The first ends of the first frame beam 281 and the second frame beam 282 are connected to the seat frame 21 of one mechanical extension device 100, and the second ends of the first frame beam 281 and the second frame beam 282 are connected to the seat frame 21 of the other mechanical extension device 100, so as to connect the seat frames 21 of the two mirror-imaged mechanical extension devices 100 into a whole, thereby realizing The two are linked; one end of the drive beam 7 is connected to the leg assembly 1 of one mechanical extender 100, and the other end of the drive beam 7 is connected to the leg assembly 1 of the other mechanical extender 100, thereby linking the leg assemblies 1 of the two mirror-imaged mechanical extenders 100; the first end of the fixed beam 8 is connected to the seat frame 22 of one mechanical extender 100, and the other end is connected to the seat frame 22 of the other mechanical extender 100, thereby fixedly connecting the seat frames 22 of the two mirror-imaged mechanical extenders 100 and improving the structural stability of the seat frame. In some embodiments, the first frame beam 281 is disposed near the leg assembly 1, and the second frame beam 282 is disposed near the backrest assembly 3.

[0109] In this embodiment, the first driving unit 201 is installed between the second frame beam 282 and the driving beam 7 , and the second driving unit 202 is installed between the second frame beam 282 and the fixed beam 8 .

[0110] In some embodiments, a first fork bracket 9 is provided on the second frame beam 282, and a second fork bracket 10 is provided on the fixed beam 8. The fixed portion of the second drive unit 202 is pivotally connected to the second fork bracket 10, and the pivot axis between the two is the first axis. The telescopic portion of the second drive unit 202 is connected to the first fork bracket 9, and the connection point between the two is the first connection point. The minimum distance between the first connection point and the first axis is less than the minimum distance between the second frame beam 282 and the fixed beam 8. This configuration can reduce the driving length or assembly length of the second drive unit 202 between the second frame beam 282 and the fixed beam 8, thereby improving the structural rigidity of the second drive unit 202 and enhancing the safety of the seat frame.

[0111] In order to reduce the rubbing feeling of the seat bracket, in this embodiment, when the seat frame 21 slides forward relative to the seat frame 22, the forward movement trend of the pivot point between the backrest assembly 3 and the seat frame 21 is greater than the forward movement trend of the highest point of the backrest assembly 3.

[0112] Specifically, as shown in Figures 14 and 15, the backrest assembly 3 includes an active rod 31, a first driven rod 32, a second driven rod 33 and a backrest mounting rod 34, wherein: the lower end of the first driven rod 32 and the lower end of the second driven rod 33 are pivotally connected to the seat frame 22, respectively, and the upper end of the first driven rod 32 and the upper end of the second driven rod 33 are pivotally connected to the backrest mounting rod 34, respectively; the lower end of the active rod 31 is pivotally connected to the seat frame 21, and the upper end of the active rod 31 is pivotally connected to either the first driven rod 32, the second driven rod 33 or the backrest mounting rod 34; the backrest board 6 is attached to the backrest mounting rod 34; when the seat frame 21 slides relative to the seat frame 22, the pivot point between the lower end of the active rod 31 and the seat frame 21 can move with the seat frame 21.

[0113] Specifically, to facilitate assembly of the first and second follower rods 32, 33 with the seat frame 22, in some embodiments, a seat plate 29 is provided on the seat frame 22, to which the first and second follower rods 32, 33 are pivotally connected. In this embodiment, since the fixed beam 8 and the seat frame 22 are fixedly connected, the seat plate 29 can also be positioned near the fixed beam 8 on the seat frame 22. The seat plate 29 can be connected to the seat frame 22 or the fixed beam 8 by bolts or welding. In the case of welding, the seat plate 29 can be considered part of the seat frame 22, or the fixed beam 8.

[0114] The lower ends of the first follower rod 32 and the second follower rod 33 are pivotally connected to the seat plate 29, respectively. The first follower rod 32, the seat plate 29, the second follower rod 33, and the backrest mounting rod 34 form a planar four-bar linkage. In some embodiments, the upper end of the active rod 31 is pivotally connected to the first follower rod 32, which is positioned near the leg assembly 1. When the seat frame 21 slides relative to the seat frame 22, the pivot point between the lower end of the active rod 31 and the seat frame 21 can follow the movement of the seat frame 21. With this arrangement, when the seat frame 21 slides relative to the seat frame 22, that is, when the seat unit switches between a TV position and a reclining position, the backrest plate 6 mounted on the backrest mounting rod 34 can adjust the seat unit's backrest angle by allowing its lower end to follow the seat frame 21 in forward and backward movement, while its upper end remains substantially stationary in the forward and backward directions (the upper end of the backrest plate 6 primarily moves in the upward and downward directions). This reduces the sensation of back rubbing when the user uses the backrest during this process.

[0115] As shown in Figure 16, in this embodiment, the backrest mounting rod 34 includes a bent follower portion 341 and an attachment portion 342. The first follower rod 32 and the second follower rod 33 are respectively pivotally connected to the follower portion 341, and the backrest plate 6 is attached to the attachment portion 342. In this embodiment, the attachment portion 342 is located outside the follower portion 341. In some embodiments, the active rod 31 includes a front rod 311 and a rear rod 312 that are connected to each other. The front rod 311 is connected to the seat frame 21, and the rear rod 312 is connected to the first follower rod 32. The extension direction of the front rod 311 and the extension direction of the rear rod 312 are arranged at an angle, so that the active rod 31 is V-shaped, with the opening facing upward.

[0116] In some embodiments, the front rod 311 includes a bent first connecting portion 3111 and a first extending portion 3112; the rear rod 312 includes a bent second connecting portion 3121 and a second extending portion 3122. The first extending portion 3112 is connected to the second extending portion 3122. The first connecting portion 3111 is connected to the seat frame 21, and the second connecting portion 3121 is connected to the first driven rod 32. The first connecting portion 3111 is located closer to the seat frame 21 than the first extending portion 3112; the second connecting portion 3121 is located closer to the first driven rod 32 than the second extending portion 3122. This reduces the contact area between the front rod 311 and the seat frame 21, thereby reducing the possibility of interference between the front rod 311 and the seat frame 21. Simultaneously, the contact area between the rear rod 312 and the first driven rod 32 is reduced, thereby reducing the possibility of interference between the rear rod 312 and the first driven rod 32.

[0117] In this embodiment, in some implementations, the front rod 311 and the rear rod 312 are integrally formed.

[0118] In this embodiment, a limit member 291 is provided on the seat frame 22 or seat plate 29. The limit member 291 extends at least partially between the first follower rod 32 and the second follower rod 33. When the seat unit is in the sitting position or TV position, the first follower rod 32 abuts against the limit member 291; when the seat unit is in the reclining position, the second follower rod 33 abuts against the limit member 291. The limit member 291 here serves to assist in limiting the position of the backrest assembly 3.

[0119] This embodiment also provides a seat unit including the aforementioned seat bracket, which requires less space behind the backrest during backrest tilt adjustment, facilitating arrangement and use of the seat unit.

Claims

1. A seat unit, comprising: A pair of mirror-image mechanical extension devices (100) are linked together, the mechanical extension device (100) comprising a seat assembly (2) for attaching a seat part, a leg assembly (1) adjustably mounted to the front end of the seat assembly (2) and a backrest assembly (3) adjustably mounted to the rear end of the seat assembly (2), the seat assembly (2) comprising a seat frame (21) and a seat frame (22) which can slide relative to each other in the front and rear directions of the seat assembly (2), the seat frame (22) being fixed relative to the ground, the leg assembly (1) being pivotally connected to the seat frame (21), the backrest assembly (3) being configured to be pivotally connected to the seat frame (21) and the seat frame (22) at the same time, and when the seat frame (21) slides relative to the seat frame (22), the pivot point between the backrest assembly (3) and the seat frame (21) can move with the seat frame (21); A driving unit (200) for driving the mechanical extension device (100) so that the seat unit switches in sequence between a sitting posture, a TV posture and a lying posture, and the seat frame (21) slides relative to the seat frame (22); as well as The first damping member (4) is arranged between the seat frame (21) and the seat frame (22), or between the backrest assembly (3) and the seat frame (22), wherein: When the seat unit switches from the sitting posture to the lying posture, the first damping member (4) prevents the seat frame (21) from sliding relative to the seat frame (22) toward the front of the seat assembly (2); When the seat unit switches from the lying posture to the sitting posture, the first damping member (4) drives the seat frame (21) to slide toward the rear of the seat assembly (2) relative to the seat frame (22).

2. The seating unit of claim 1, wherein: It also comprises a second damping member (5), wherein the second damping member (5) is arranged between the leg assembly (1) and the seat assembly (2); When the seat unit switches from the sitting posture to the lying posture, the second damping member (5) drives the leg assembly (1) to extend toward the front of the seat assembly (2); When the chair unit switches from the lying posture to the TV posture, the second damping member (5) prevents the leg assembly (1) from being retracted toward the rear of the seat assembly (2).

3. The seating unit of claim 2, wherein: The second damping member (5) is arranged between the leg assembly (1) and the seat frame (21).

4. The seating unit of claim 1, wherein: The first damping member (4) is a tension spring or a rubber tube.

5. A seat unit comprising: A pair of mirror-image mechanical extension devices (100) are linked together, the mechanical extension device (100) comprising a seat assembly (2) for attaching a seat part, a leg assembly (1) adjustably mounted to the front end of the seat assembly (2) and a backrest assembly (3) adjustably mounted to the rear end of the seat assembly (2), the seat assembly (2) comprising a seat frame (21) and a seat frame (22) which can slide relative to each other in the front and rear directions of the seat assembly (2), the seat frame (22) being fixed relative to the ground, the leg assembly (1) being pivotally connected to the seat frame (21), the backrest assembly (3) being configured to be pivotally connected to the seat frame (21) and the seat frame (22) at the same time, and when the seat frame (21) slides relative to the seat frame (22), the pivot point between the backrest assembly (3) and the seat frame (21) can move with the seat frame (21); A driving unit (200) for driving the mechanical extension device (100) so that the seat unit switches in sequence between a sitting posture, a TV posture and a lying posture, and the seat frame (21) slides relative to the seat frame (22); as well as A second damping member (5), the second damping member (5) being arranged between the leg assembly (1) and the seat frame (21); When the seat unit switches from the sitting posture to the lying posture, the second damping member (5) drives the leg assembly (1) to extend toward the front of the seat assembly (2); When the chair unit switches from the lying posture to the TV posture, the second damping member (5) prevents the leg assembly (1) from being retracted toward the rear of the seat assembly (2).

6. A seating unit according to any one of claims 2, 3 or 5, wherein: It also includes a fixed beam (8) and a driving beam (7), wherein: The driving beam (7) is used to link the leg components (1) of a pair of the mechanical extension devices (100), and the fixed beam (8) is arranged between the seat frames (22) of the pair of the mechanical extension devices (100); The driving unit (200) is a telescopic member, the telescopic end of the telescopic member is pivotally connected to the driving beam (7), and the fixed end of the telescopic member is pivotally connected to the fixed beam (8).

7. The seating unit according to any one of claims 1 to 5, wherein: The backrest assembly (3) comprises an active rod (31) and a driven rod which are pivotally connected, wherein: the active rod (31) is pivotally connected to the seat frame (21); The driven rod is pivotally connected to the seat frame (22); the backrest plate (6) is attached to the active rod (31).

8. The seating unit according to any one of claims 1 to 5, wherein: The backrest assembly (3) comprises an active rod (31), a first driven rod (32), a second driven rod (33) and a backrest mounting rod (34), wherein: The lower end of the first driven rod (32) and the lower end of the second driven rod (33) are respectively pivotally connected to the seat frame (22), and the upper end of the first driven rod (32) and the upper end of the second driven rod (33) are respectively pivotally connected to the backrest mounting rod (34); The lower end of the active rod (31) is pivotally connected to the seat frame (21), and the upper end of the active rod (31) is pivotally connected to any one of the first driven rod (32), the second driven rod (33) or the backrest mounting rod (34); A backrest plate (6) is attached to the backrest mounting rod (34); When the seat frame (21) slides relative to the seat frame (22), the pivot point between the lower end of the active rod (31) and the seat frame (21) can move along with the seat frame (21).

9. The seating unit of claim 8, wherein: The backrest mounting rod (34) comprises a bent follower portion (341) and an attachment portion (342); the first follower rod (32) and the second follower rod (33) are respectively pivotally connected to the follower portion (341); and the backrest plate (6) is attached to the attachment portion (342).

10. The seating unit of claim 8, wherein: A first damping surface is provided on a side of the first driven rod (32) close to the second driven rod (33), and a second damping surface is provided on a side of the second driven rod (33) close to the first driven rod (32), and the first damping surface is in frictional contact with the second damping surface.

11. A seating unit according to claim 9 or 10, wherein: The seat unit further comprises a third limiting member (271), wherein the third limiting member (271) at least partially extends between the first driven rod (32) and the second driven rod (33); When the seat unit is in the sitting posture and the TV posture, the first driven rod (32) abuts against the third limiting member (271); When the seat unit is in the lying position, the second follower rod (33) abuts against the third limiting member (271).

12. The seating unit according to any one of claims 1 to 5, wherein: The seat frame (22) is provided with a first slide rail member (23), and the seat frame (21) is provided with a second slide rail member (24) adapted to the first slide rail member (23); The first slide rail member (23) is slidably connected to the second slide rail member (24).

13. The seating unit of claim 12, wherein: The first slide rail member (23) comprises a first bottom plate (230), first outer plates (231) are arranged on both sides of the first bottom plate (230), a first inner plate (232) is arranged at a free end of the first outer plate (231) bent inwardly, and the first bottom plate (230) is arranged on the seat frame (22); The second slide rail member (24) comprises a second bottom plate (240), second inner plates (241) are arranged on both sides of the second bottom plate (240), a second outer plate (242) is arranged at a free end of the second inner plate (241) bent outward, and the second bottom plate (240) is arranged on the seat frame (21); The second bottom plate (240) and the second inner plate (241) arranged on the second bottom plate (240) are both located between the two first inner plates (232), and the second outer plate (242) is located between the first outer plate (231) and the first inner plate (232) corresponding thereto; A rolling member (25) is provided on the second outer plate (242), and the rolling member (25) is in rolling contact or sliding contact with the first bottom plate (230) and / or the first outer plate (231).

14. The seating unit of claim 13, wherein: The rolling member (25) comprises a support member (250) arranged on the second outer plate (242), and a rolling body (251) is arranged at the lower end of the support member (250) for rolling or sliding contact with the first bottom plate (230) and / or the first outer plate (231).

15. A seating unit according to claim 13 or 14, wherein: The seat frame (21) comprises a supporting plate (210), and side plates (211) are bent on both sides of the supporting plate (210); the second slide rail member (24) is arranged on the supporting plate (210) and is located between the two side plates (211); The first slide rail member (23) at least partially extends between the two side plates (211).

16. The seating unit of claim 5, wherein: The second damping member (5) is any one of a tension spring, a torsion spring or a rubber tube.

17. A seating unit according to any one of claims 1 to 5, wherein: The seat frame (22) is provided with a first support (221) and a second support (222), wherein the first support (221) is provided on a side close to the leg assembly (1), and the second support (222) is provided on a side close to the backrest assembly (3).

18. A seating unit according to any one of claims 1 to 5, wherein: It also includes a first frame beam (281) and a second frame beam (282), wherein: The first end of the first frame beam (281) and the first end of the second frame beam (282) are both connected to the seat frame (21) of one of the mechanical extension devices (100); The second end of the first frame beam (281) and the second end of the second frame beam (282) are both connected to the seat frame (21) of another mechanical extension device (100); The first frame beam (281) is arranged on a side close to the leg assembly (1), and the second frame beam (282) is arranged on a side close to the backrest assembly (3).

19. The seating unit of claim 18, wherein: A plurality of hooks (283) are respectively and integrally stamped and formed on the first frame beam (281) and the second frame beam (282); The seat unit also includes a serpentine spring, one end of which is hooked on the hook (283) of the first frame beam (281), and the other end of which is hooked on the corresponding hook (283) on the second frame beam (282).

20. The seating unit of claim 6, wherein: The leg assembly (1) comprises a driving connecting rod (12), a follower connecting rod (11), a first extending connecting rod (13), a second extending connecting rod (14) and a footrest (16), wherein: The first end of the driving link (12) and the follower link (11) are both pivotally connected to the seat frame (21), the second end of the driving link (12) is pivotally connected to the first end of the first extension link (13), and the follower link (11) is pivotally connected to the first end of the second extension link (14); The second end of the first extension link (13) and the second end of the second extension link (14) are respectively pivotally connected to the footrest (16); The driving link (12) is pivotally connected to the second extension link (14), and the pivot point of the two is located between the two ends of the second extension link (14); Both ends of the driving beam (7) are respectively connected to the corresponding driving connecting rods (12).

21. The seating unit of claim 20, wherein: The leg assembly (1) further comprises a first stopper (15), wherein the first stopper (15) is arranged on the second extension link (14), and the pivot point between the second extension link (14) and the driving link (12) is defined as a first pivot point (a), and the first stopper (15) is located between the first end of the second extension link (14) and the first pivot point (a).

22. The seating unit of claim 20, wherein: The pivot point between the follower link (11) and the seat frame (21) is defined as a second pivot point (b), and the second pivot point (b) is located between the two end points of the follower link (11), wherein one end of the follower link (11) is pivotally connected to the second extension link (14), and the other end of the follower link (11) is pivotally connected to the front end of the transition link (17), and the front end of the second damping member (5) is connected to the rear end of the transition link (17).

23. The seating unit of claim 22, wherein: The pivot point between the driving connecting rod (12) and the seat frame (21) is defined as a third pivot point (c), and the second pivot point (b) is arranged close to one side of the backrest assembly (3).

24. The seating unit of claim 20, wherein: A motor bracket (71) is provided on the driving beam (7), and the telescopic end of the telescopic member is pivotally connected to the motor bracket (71); The pivot point between the telescopic end of the telescopic member and the motor bracket (71) is defined as a fourth pivot point (d), and when the seat unit is in the TV posture and the lying posture, the fourth pivot point (d) is located behind the driving beam (7); When the seat unit is in the sitting posture, the fourth pivot point (d) is located below the driving beam (7).

25. A seating unit according to any one of claims 1 to 5, wherein: The seat frame (21) is provided with a second limiting member (212); When the chair unit switches from the TV posture to the sitting posture, the leg assembly (1) is folded toward the rear of the seat assembly (2) and abuts against the second limiting member (212) to maintain the sitting posture; When the chair unit switches from the sitting posture to the TV posture, the leg assembly (1) extends toward the front of the seat assembly (2) and disengages from the second limiting member (212).

26. A seating unit according to any one of claims 1 to 5, wherein: When the seat frame (21) slides forward relative to the seat frame (22), at least part of the structure of the backrest assembly (3) can move forward following the seat frame (21), and the highest point of the backrest assembly (3) has a downward and forward movement tendency.

27. A seat comprising the seat unit according to any one of claims 1-26.

28. A seat support, comprising a drive member (200) and two mirror-image-arranged and linked mechanical extension devices (100), wherein: The mechanical stretching device (100) comprises: A seat assembly (2) comprises a seat frame (22) and a seat bracket (21), wherein the seat bracket (21) is arranged on the seat frame (22) and can slide relative to the seat frame (22); A leg assembly (1) adjustably pivotally connected to the seat frame (21); The backrest assembly (3) is configured to be pivotally connected to the seat frame (21) and the seat frame (22) at the same time, and when the seat frame (21) slides relative to the seat frame (22), the pivot point between the backrest assembly (3) and the seat frame (21) can follow the movement of the seat frame (21), and the highest point of the backrest assembly (3) can have a movement tendency to follow the movement of the seat frame (21) in the horizontal direction; when the seat frame (21) slides forward relative to the seat frame (22), the highest point of the backrest assembly (3) has a movement tendency to approach the ground in the longitudinal direction; when the seat frame (21) slides backward relative to the seat frame (22), the highest point of the backrest assembly (3) has a movement tendency to move away from the ground in the longitudinal direction; The driving member (200) comprises: A first driving unit (201), arranged on the seat frame (21), and used for driving the leg assembly (1) to adjust the posture; The second driving unit (202) is arranged on the seat frame (22) and is used to drive the seat frame (21) to slide relative to the seat frame (22).

29. A seat support according to claim 28, wherein: When the seat frame (21) slides forward relative to the seat frame (22), the forward movement tendency of the pivot point between the backrest assembly (3) and the seat frame (21) is greater than the forward movement tendency of the highest point of the backrest assembly (3).

30. A seat support according to claim 28 or 29, wherein: The backrest assembly (3) comprises an active rod (31), a first driven rod (32), a second driven rod (33) and a backrest mounting rod (34), wherein: The lower end of the first driven rod (32) and the lower end of the second driven rod (33) are respectively pivotally connected to the seat frame (22), and the upper end of the first driven rod (32) and the upper end of the second driven rod (33) are respectively pivotally connected to the backrest mounting rod (34); The lower end of the active rod (31) is pivotally connected to the seat frame (21), and the upper end of the active rod (31) is pivotally connected to any one of the first driven rod (32), the second driven rod (33) or the backrest mounting rod (34); A backrest plate (6) is attached to the backrest mounting rod (34); When the seat frame (21) slides relative to the seat frame (22), the pivot point between the lower end of the active rod (31) and the seat frame (21) can move along with the seat frame (21).

31. The seat support according to claim 30, wherein: The backrest mounting rod (34) comprises a bent follower portion (341) and an attachment portion (342); the first follower rod (32) and the second follower rod (33) are respectively pivotally connected to the follower portion (341); and the backrest plate (6) is attached to the attachment portion (342).

32. The seat support according to claim 30, wherein: The active rod (31) comprises a front rod (311) and a rear rod (312) connected to each other, wherein: the front rod (311) is connected to the seat frame (21), and the rear rod (312) is connected to the first driven rod (32); The extension direction of the front rod (311) and the extension direction of the rear rod (312) are arranged at an angle, so that the active rod (31) is V-shaped with the opening facing upward.

33. A seat support according to claim 32, wherein: The front end rod (311) comprises a first connecting portion (3111) and a first extending portion (3112) which are bent; the rear end rod (312) comprises a second connecting portion (3121) and a second extending portion (3122) which are bent; The first extension portion (3112) is connected to the second extension portion (3122), the first connection portion (3111) is connected to the seat frame (21), and the second connection portion (3121) is connected to the first driven rod (32); the first connection portion (3111) is arranged closer to the seat frame (21) than the first extension portion (3112); and the second connection portion (3121) is arranged closer to the first driven rod (32) than the second extension portion (3122).

34. The seat support according to claim 32, wherein: The front end rod (311) and the rear end rod (312) are integrally formed.

35. The seat support according to claim 30, wherein: The seat support further comprises a limiting member (291), wherein the limiting member (291) at least partially extends between the first driven rod (32) and the second driven rod (33); When the seat unit is in a sitting posture or a TV posture, the first driven rod (32) abuts against the limiting member (291); When the seat unit is in a lying position, the second driven rod (33) abuts against the limiting member (291).

36. A seating unit comprising a seat support as claimed in any one of claims 28 to 35.

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