A transformable seat

Abstract

This invention discloses a deformable seat, including a base, a seat cushion assembly mounted on the base, and a backrest assembly disposed at the rear end of the seat cushion assembly. The front end of the seat cushion assembly is rotatably connected to the base. The backrest assembly has overlapping front and rear backrests. The lower part of the front backrest is connected to the base via a transmission mechanism and can be flipped back and forth. The rear backrest can be flipped backward relative to the front backrest to a horizontal state. The seat can be transformed from a sitting position to a reclining position. In the reclining position, the seat cushion assembly flips forward relative to the base to a horizontal state, the front backrest flips forward under the drive of the transmission mechanism until it is flush with the rear end of the seat cushion assembly, and the rear backrest flips backward to a horizontal state. The advantages of this invention are: it can be independently transformed into a bed, offering the advantages of convenient and quick operation.

Description

Technical Field

[0001] This invention relates to the field of automotive seat technology, and more specifically to a deformable seat. Background Technology

[0002] Currently, due to the increasing demand for long-distance travel and camping, many large SUVs have introduced a double bed mode so that users can lie down and rest during their travels.

[0003] However, in the current automotive industry, reclining and sleeping functions are typically achieved in the following ways: 1. Removing the headrests from the first-row seats, folding down the backrests, and connecting the backrests with the second-row seats to form a bed; 2. Folding the third-row seat backrests forward and then rotating them together with the second-row seats to form a bed; 3. Folding down the backrests of both the second and third-row seats and then connecting them with the trunk floor to form a bed. All of these methods require at least two rows of seats to be used together or simultaneously connected to the trunk floor to form a bed, which is inconvenient for users and has drawbacks such as cumbersome procedures and poor space adaptability. Summary of the Invention

[0004] In view of this, the present invention provides a transformable seat that can be independently transformed into a bed, which has the advantages of convenient and quick operation.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A deformable seat includes a base, a seat cushion assembly disposed on the base, and a backrest assembly disposed at the rear end of the seat cushion assembly. The key features are: the front end of the seat cushion assembly is rotatably connected to the base, the backrest assembly has an overlapping front backrest and a rear backrest, the lower part of the front backrest is connected to the base in a forward and backward flipping manner through a transmission mechanism, and the rear backrest can be flipped backward to a horizontal state relative to the front backrest.

[0007] The seat can be transformed from a sitting position to a reclining position. In the reclining position, the seat cushion assembly flips forward relative to the base to a horizontal position, the front backrest flips forward under the drive of the transmission mechanism to be flush with the rear end of the seat cushion assembly, and the rear backrest flips backward to a horizontal position.

[0008] With the above structure, in the seated position, the front backrest and the backrest are arranged overlapping. When the seat needs to be transformed into a bed, the front end of the seat cushion assembly is rotated 180 degrees forward around the base so that the bottom of the seat cushion assembly is facing upward. Then, under the drive of the transmission mechanism, the overlapping front backrest and the backrest are rotated forward as a whole. The upper end of the front backrest is flush with the rear end of the rotated seat cushion assembly. Then the backrest is rotated backward relative to the front backrest to a horizontal state. At this time, the seat cushion assembly, the front backrest and the backrest are connected to form a bed.

[0009] Preferably, the seat cushion assembly and the base are provided with a front link and a rear link. The upper and lower ends of the front link are rotatably connected to the front end of the seat cushion assembly and the base, respectively. The upper and lower ends of the rear link are rotatably connected to the rear end of the seat cushion assembly and the base, respectively. The seat cushion assembly is provided with a locking assembly at the position corresponding to the rotatable connection of the rear link. The locking assembly is used to switch the seat cushion assembly between being rotatably connected to the rear link and being disconnected. A locking assembly is provided between the front link and the base. The locking assembly is used to switch the front link between being rotatably connected to the base and being fixedly connected.

[0010] A driver is provided between the seat assembly and the front linkage, and the driver is used to drive the seat assembly to rotate relative to the front linkage.

[0011] Preferably, the base is provided with a retaining mechanism, which can keep the rear link locked relative to the base after the upper end of the rear link is disconnected from the seat assembly.

[0012] Preferably, the retaining mechanism includes a first gear and a second gear rotatably mounted on the base. The lower end of the front connecting rod is provided with a first arc-shaped tooth that meshes with the first gear, and the lower end of the rear connecting rod is provided with a second arc-shaped tooth that meshes with the second gear. The lower end of the first gear has a first extension extending downward, and the lower end of the second gear has a second extension extending downward. A synchronizing rod is provided between the lower parts of the first extension and the second extension, and the two ends of the synchronizing rod are rotatably connected to the lower parts of the first extension and the second extension, respectively.

[0013] Preferably, the locking assembly includes a locking bracket fixed to the base, a locking rod located above the locking bracket, and a zipper connecting the locking bracket and the locking rod. The lower end of the front connecting rod is rotatably connected to the locking bracket, and the middle part of the locking rod is hinged to the front connecting rod. One end of the locking bracket is provided with a notch, and one end of the locking rod has a locking part adapted to the notch. The zipper is used to lock the locking part into the notch or to move the locking part upward away from the notch.

[0014] Preferably, there are two sets of both the front and rear connecting rods, with the two sets of front connecting rods respectively located on both sides of the front end of the seat assembly, and the two sets of rear connecting rods respectively located on both sides of the rear end of the seat assembly.

[0015] Preferably, the transmission mechanism includes a first connecting rod and a second connecting rod arranged on the side of the front backrest. The upper end of the first connecting rod is rotatably connected to the lower part of the front backrest, and the lower end is hinged to the base. The upper end of the second connecting rod is hinged to the lower end of the front backrest, and the lower end is hinged to the base. An angle adjustment mechanism is provided between the front backrest and the upper end of the first connecting rod, which is used to drive the front backrest to rotate back and forth around the upper end of the first connecting rod.

[0016] Preferably, the first link and the second link are arranged from front to back, and in the height direction of the front backrest side, the rotation center of the upper end of the first link is located above the rotation center of the upper end of the second link.

[0017] Preferably, a flipping drive mechanism is provided between the front backrest and the rear backrest, which is used to drive the rear backrest to flip backward relative to the front backrest.

[0018] Preferably, the upper end of the front backrest is equipped with a headrest that can be folded forward, and the front backrest is provided with a drive mechanism for driving the headrest to rotate back and forth relative to the upper end of the front backrest.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The deformable seat provided by this invention, when the seat is transformed from a sitting position to a lying position, the front end of the seat cushion assembly rotates 180 degrees forward around the base so that the bottom of the seat cushion assembly faces upward. Then, under the driving action of the transmission mechanism, the overlapping front backrest and rear backrest rotate forward as a whole, and the upper end of the front backrest connects and is flush with the rear end of the rotated seat cushion assembly. Then, the rear backrest rotates backward relative to the front backrest to a horizontal state. At this time, the seat cushion assembly, front backrest and rear backrest are connected to form a bed, which has the advantages of convenient operation, large area and high flatness after forming a bed, and improves the intelligence of the whole vehicle.

[0021] 2. The deformable seat provided by the present invention, by setting a front link, a rear link, a buckle assembly and a locking assembly, forms a deformable four-bar linkage with the front link, base, rear link and seat cushion assembly. This structural design can realize the stable support and forward movement function of the seat cushion assembly when the seat is in a sitting position, and at the same time ensure the stability and feasibility of the seat cushion assembly flipping forward. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the deformable seat in a seated position.

[0023] Figure 2 This is a schematic diagram of the structure of the deformable chair after it has been assembled into a bed.

[0024] Figure 3 This is a schematic diagram illustrating the structure of the forward-folding and tilting drive mechanism E of the backrest assembly 3;

[0025] Figure 4 The right view of the deformable chair in a seated position;

[0026] Figure 5 This is a cross-sectional view of the deformable chair in a seated position.

[0027] Figure 6 This is a right view of the convertible chair after it has been assembled into a bed.

[0028] Figure 7 A structural diagram showing the connection between the seat assembly 2 and the base 1 (synchronization rod F3 is hidden);

[0029] Figure 8 This is a magnified view of a portion of the locking assembly C;

[0030] Figure 9 This is a schematic diagram of the structure of the deformable seat cover in a sitting position after it has been put on.

[0031] Figure 10 This is a schematic diagram of the structure of the deformable seat after it has been fitted with the cover and is now assembled into a bed. Detailed Implementation

[0032] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0033] like Figure 1 As shown, a deformable seat includes a base 1, a seat cushion assembly 2 disposed on the base 1, and a backrest assembly 3 disposed at the rear end of the seat cushion assembly 2, wherein the front end of the seat cushion assembly 2 is rotatably connected to the base 1. Figure 4 As can be seen, the backrest assembly 3 has a front backrest 31 and a rear backrest 32 arranged in an overlapping manner. The lower part of the front backrest 31 is connected to the base 1 by a transmission mechanism A, which can flip back and forth. The rear backrest 32 can flip backward relative to the front backrest 31 to a horizontal state. The seat can be transformed from a sitting position to a reclining position. In the sitting position, the seat cushion assembly 2 is supported on the base 1 at a near-parallel angle, and the backrest assembly 3 is tilted and supported at the rear end of the seat cushion assembly 2; see reference. Figure 2 In the lying position, the seat cushion assembly 2 flips forward relative to the base 1 to a horizontal position. The front backrest 31 flips forward under the drive of the transmission mechanism A to be flush with the rear end of the seat cushion assembly 2. The rear backrest 32 flips backward relative to the front backrest 31 to a horizontal position. At this point, the seat cushion assembly 2, the front backrest 31 and the rear backrest 32 are connected to form a bed.

[0034] Based on the above structural design, and referring to Figure 9 and 10In the seated position, the front backrest 31 and rear backrest 32 overlap. When the user needs to lie down and rest, the front end of the seat cushion assembly 2 rotates 180 degrees forward around the base 1, so that the bottom of the seat cushion assembly 2 faces upward. Then, driven by the transmission mechanism A, the overlapping front backrest 31 and rear backrest 32 rotate forward as a whole, with the upper end of the front backrest 31 flush with the rear end of the rotated seat cushion assembly 2. Then, the rear backrest 32 rotates backward relative to the front backrest 31 to a horizontal position. At this point, the seat cushion assembly 2, front backrest 31, and rear backrest 32 are connected to form a bed. By manually or electrically rotating the seat cushion assembly 2, front backrest 31, and rear backrest 32, the seat can be converted into an independent bed, which has the advantages of convenient operation and high flatness after conversion, improving the overall intelligence of the vehicle. At the same time, the backrest adopts a double-layer structure design. By unfolding the rear backrest 32 backward to a horizontal position, the support area of ​​the bed can be expanded, ensuring sufficient support length, thus accommodating users of different body types.

[0035] The following details an implementation structure for electrically controlling the transformation of a seat into a bed.

[0036] Please refer to Figure 1 and 4 A front connecting rod B1 and a rear connecting rod B2 are provided between the seat cushion assembly 2 and the base 1. The upper and lower ends of the front connecting rod B1 are rotatably connected to the front end of the seat cushion assembly 2 and the base 1, respectively, and the upper and lower ends of the rear connecting rod B2 are rotatably connected to the rear end of the seat cushion assembly 2 and the base 1, respectively. A locking assembly C is provided at the position corresponding to the rotatable connection with the rear connecting rod B2 on the seat cushion assembly 2. The locking assembly C allows the seat cushion assembly 2 to switch between being rotatably connected to the rear connecting rod B2 and being disconnected. A locking assembly D is provided between the front connecting rod B1 and the base 1. The locking assembly D allows the front connecting rod B1 to switch between being rotatably connected to the base 1 and being fixedly connected. An actuator 4 is provided between the seat cushion assembly 2 and the front connecting rod B1. The actuator 4 is used to drive the seat cushion assembly 2 to rotate relative to the front connecting rod B1. In this embodiment, the actuator 4 is an electric angle adjuster. The rotation of the seat cushion assembly 2 relative to the front connecting rod B1 can be driven by controlling the electric angle adjuster with a motor.

[0037] Based on this, when the seat is in a seated position, the locking assembly C keeps the rear end of the seat cushion assembly 2 rotatably connected to the upper end of the rear link B2, and the locking assembly D keeps the lower end of the front link B1 rotatably connected to the base 1. At this time, under the self-locking action of the actuator 4, the front link B1, the base 1, the rear link B2, and the seat cushion assembly 2 form a stable four-bar linkage, and the seat cushion assembly 2 can be stably supported on the base 1. In addition, the seat cushion assembly 2 also has an independent forward movement function. In the seated position, the actuator 4 drives the seat cushion assembly 2 to rotate relative to the front link B1, which drives the four-bar linkage to move, thereby realizing the forward movement adjustment of the seat cushion assembly 2, freeing up space under the backrest assembly 3 for angle adjustment of the backrest, and improving the user's seating comfort. When the seat needs to be transformed into a bed, the locking assembly C disconnects the seat cushion assembly 2 from the rear link B2. Under the drive of the driver 4, the rear end of the seat cushion assembly 2 can move upward away from the upper end of the rear link B2, so that the seat cushion assembly 2 can flip forward and flatten around the front link B1. At the same time, the locking assembly D fixes the lower end of the front link B1 to the base 1, ensuring that the front link B1 is in a stable support state, thereby providing strong support for the flipping of the seat cushion assembly 2 and ensuring the feasibility of forming a bed.

[0038] Further, refer to Figure 7 and 8 A pin d is fixedly provided at the upper end of the rear connecting rod B2, and the pin d extends along the width direction of the seat cushion assembly 2. In this embodiment, the locking assembly C adopts a floor lock structure, which includes a base C3 fixedly disposed at the rear end of the seat cushion assembly 2, a locking hook C1 rotatably disposed on the base C3, and an unlocking component C2 for controlling the rotation of the locking hook C1. In the locked state, the locking hook C1 loops around the pin d, so that the pin d remains rotatably connected to the rear end of the seat cushion assembly 2; when unlocked, the unlocking component C2 pulls the locking hook C1 to rotate, the locking hook C1 releases the pin d, and the rear end of the seat cushion assembly 2 can move upward away from the pin d. Floor locks are a mature technology in the field of automotive seat technology, and will not be described in detail here.

[0039] like Figure 4 As shown, the base 1 is equipped with a retaining mechanism F. When the upper end of the rear link B2 is disconnected from the seat cushion assembly 2, the retaining mechanism F can keep the rear link B2 locked relative to the base 1. With this design, after the locking assembly C is unlocked, when the rear end of the seat cushion assembly 2 flips forward away from the rear link B2, the rear link B2 can be held in the designed position under the action of the retaining mechanism F. When the seat returns to the sitting position, the seat cushion assembly 2 flips from front to back, and the rear end of the seat cushion assembly 2 can return to the position connected to the locking assembly C, so as to ensure that the locking assembly C can accurately lock the pin d.

[0040] Furthermore, combined Figure 4 and Figure 7As shown, the retaining mechanism F includes a first gear F1 and a second gear F2 rotatably mounted on the base 1. The lower end of the front connecting rod B1 is provided with a first arc-shaped tooth a that meshes with the first gear F1, and the lower end of the rear connecting rod B2 is provided with a second arc-shaped tooth b that meshes with the second gear F2. The lower end of the first gear F1 has a downwardly extending first extension F11, and the lower end of the second gear F2 has a downwardly extending second extension F21. A synchronizing rod F3 is provided between the lower parts of the first extension F11 and the second extension F21, and the two ends of the synchronizing rod F3 are rotatably connected to the lower parts of the first extension F11 and the second extension F21, respectively. With this design, when the seat transforms into a bed, the locking assembly D fixes the lower end of the front link B1 to the base 1. Specifically, the first arc-shaped tooth a at the lower end of the front link B1 is fixedly engaged with the first gear F1. Under the synchronous action of the synchronizing rod F3, the second arc-shaped tooth b at the lower end of the rear link B2 is also fixedly engaged with the second gear F2, thus locking the rear link B2 relative to the base 1. On the other hand, when the seat is in a seated position, the locking assembly D keeps the lower end of the front link B1 rotatably connected to the base 1. The driver 4 drives the seat cushion assembly 2 to rotate around the front link B1, which in turn drives the lower end of the front link B1 to rotate. This rotation drives the first gear F1 to rotate around the base 1. Under the synchronous transmission of the synchronizing rod F3, this sequentially drives the second gear F2 and the lower end of the rear link B2 to rotate, thereby achieving the forward movement of the seat cushion assembly 2.

[0041] In the above structural design, the function of the retaining mechanism F is as follows: 1. After the locking component C is unlocked, the seat assembly 2 flips forward. Under the action of the retaining mechanism F, the rear linkage B2 remains stationary, ensuring that when the seat assembly 2 flips back to a horizontal state, the locking component C can accurately engage with the pin d. 2. In the sitting posture mode, when the driver 4 drives the seat assembly 2 to move forward for adjustment, the retaining mechanism F, using the above transmission structure, will not affect the four-bar linkage composed of the front linkage B1, base 1, rear linkage B2, and seat assembly 2, thus ensuring that the seat assembly 2 can achieve the forward and backward adjustment function. 3. Through the meshing self-locking action between gears, in the locked state, the stability of the fixed support of the front linkage B1 and rear linkage B2 can be improved; in the unlocked state, through gear transmission, it has the technical advantages of high transmission efficiency and high motion precision.

[0042] like Figure 4 As shown, in this embodiment, a torsion spring 8 is provided between the lower end of the rear connecting rod B2 and the base 1. The torsion spring 8 can eliminate the gap between the lower end of the rear connecting rod B2 and the base 1, thereby improving the stability of the overall structure.

[0043] Reference Figure 5The locking assembly D includes a locking bracket D11, a locking rod D12 located above the locking bracket D11, and a zipper D13 connecting the locking bracket D11 and the locking rod D12. The locking bracket D11 is fixedly mounted on the base 1. The lower end of the front connecting rod B1 is rotatably connected to the locking bracket D11, and the middle part of the locking rod D12 is hinged to the front connecting rod B1. One end of the locking bracket D11 has a notch e, and one end of the locking rod D12 has a downwardly extending latching part f, which conforms to the notch e. ​​When the locking assembly D is locked, the latching part f of the locking rod D12 latches downward onto the notch e. ​​At this time, the locking bracket D11, the locking rod D12, and the front connecting rod B1 form a stable triangular frame, and the front connecting rod B1 can be fixedly supported on the base 1. When unlocking, the controller can be used to pull the locking lever D12 downward by controlling the pull lock D13. The locking part f can move upward away from the notch e. ​​At this time, the lower end of the front connecting rod B1 can maintain a rotatable connection with the base 1.

[0044] In this embodiment, the front link B1, the rear link B2, the pin d, the locking assembly C, and the retaining mechanism F are each provided in two sets, and they correspond one to one. The two sets of front links B1 are located at the front ends of both sides of the seat assembly 2, and the two sets of rear links B2 are located at the rear ends of both sides of the seat assembly 2. The locking assembly D is located inside one of the front links B1.

[0045] Please refer to Figure 4 The transmission mechanism A includes a first connecting rod A1 and a second connecting rod A2 arranged on the side of the front backrest 31. The upper end of the first connecting rod A1 is rotatably connected to the lower part of the front backrest 31, and the lower end is hinged to the base 1. The upper end of the second connecting rod A2 is hinged to the lower end of the front backrest 31, and the lower end of the second connecting rod A2 is hinged to the base 1. Figure 1 As can be seen, an angle adjustment mechanism 5 is provided between the front backrest 31 and the upper end of the first connecting rod A1. The angle adjustment mechanism 5 can drive the front backrest 31 to rotate back and forth around the upper end of the first connecting rod A1. In the sitting position, the angle adjustment mechanism 5 drives the front backrest 31 to rotate within a small range, which can realize the angle adjustment of the backrest. When the seat is folded into a bed, the angle adjustment mechanism 5 can drive the front backrest 31 to tilt forward and flatten around the upper end of the first connecting rod A1 (see reference). Figure 6 At this point, the support of the two links enables the front backrest 31 to be stably kept in a horizontal state.

[0046] Revisit Figure 4 and 6In this embodiment, the first link A1 and the second link A2 are arranged from front to back. In the height direction of the side of the front backrest 31, the rotation center of the upper end of the first link A1 is located above the rotation center of the upper end of the second link A2. To avoid interference between the movement of the first link A1 and the second link A2, the upper part of the first link A1 has an arc-shaped structure. Considering this, the first link A1, the base 1, the second link A2 and the front backrest 31 form a four-bar linkage. During the process of the angle adjustment mechanism 5 driving the front backrest 31 to flip forward and flatten around the upper end of the first link A1, the upper end of the second link A2 can pull the lower end of the front backrest 31 to move backward. The basis for this design is that the design length of the seat cushion is usually less than the length of the backrest. When the seat cushion assembly 2 is flipped forward, the space between the rear end of the seat cushion assembly 2 and the front backrest 31 is less than the length of the front backrest 31. Therefore, during the forward flipping process of the front backrest 31, the upper end of the second link A2 pulls the lower end of the front backrest 31 to move backward, which can ensure that the flipping of the front backrest 31 is not interfered with, and the front backrest 31 can be connected to the rear end of the seat cushion assembly 2.

[0047] In this embodiment, there are two sets of first link A1 and two sets of second link A2, which correspond one to one. The two sets of first link A1 are located on both sides of the front backrest 31 in the width direction.

[0048] like Figure 2 As shown, a flipping drive mechanism E is provided between the front backrest 31 and the rear backrest 32, which can drive the rear backrest 32 to flip backward relative to the front backrest 31, so that when the seat is transformed into a bed, the rear backrest 32 can automatically flip backward relative to the front backrest 31 to a horizontal state.

[0049] Furthermore, for example Figure 3 As shown, the flipping drive mechanism E includes a drive assembly, a fixed gear E1 fixedly mounted at the rear end of the front backrest 31, and a revolving gear E2 disposed at the rear end of the rear backrest 32. Here, "rear end" refers to the orientation of the front backrest 31 and the rear backrest 32 in their forward-folded-flat state. The revolving gear E2 is engaged with the fixed gear E1. The drive assembly can drive the revolving gear E2 to rotate circumferentially around the fixed gear E1, thereby causing the rear backrest 32 to flip backward around the rear end of the front backrest 31 to a horizontal state. After flipping, the upper side of the rear backrest 32 is flush with the upper side of the front backrest 31, ensuring the flatness of the surfaces of the rear backrest 32 and the front backrest 31 after the rear backrest 32 is unfolded.

[0050] For details, please refer to the following: Figure 3The drive assembly includes a driver E4 and a retainer E3 rotatably connected between the rear ends of the front backrest 31 and the rear backrest 32. The two ends of the retainer E3 are respectively rotatably sleeved on the axis of the planetary gear E2 and the fixed gear E1. The driver E4 is used to drive the retainer E3 to rotate around its rotation center with the front backrest 31, thereby driving the planetary gear E2 to rotate around the fixed gear E1 in a circumferential direction, thereby enabling the rear backrest 32 to flip backward relative to the front backrest 31 to a horizontal state.

[0051] In this embodiment, there are two sets of fixed gears E1, revolving gears E2 and retainers E3, which correspond one to one. In the sitting position, the two sets of fixed gears E1 are fixed on both sides of the lower end of the front backrest 31, and the two sets of revolving gears E2 are rotatably set on both sides of the lower end of the rear backrest 32.

[0052] Please refer to Figure 4 and 6 The upper end of the front backrest 31 is equipped with a headrest 6 that can fold forward. The front backrest 31 is equipped with a drive mechanism H, which can drive the headrest 6 to rotate back and forth relative to the upper end of the front backrest 31. During the transformation of the seat into a bed, the drive mechanism H drives the headrest 6 to fold forward 90 degrees, which can prevent the front backrest 31 from interfering with the seat cushion assembly 2 during the forward flipping process. At the same time, after the front backrest 31 is folded forward and flattened, the headrest 6 can contact the vehicle floor, providing strong support for the front end of the front backrest 31, further improving the reliability and stability of the seat bed structure.

[0053] Combination Figure 9 and 10 As shown, a cover plate 7 is rotatably installed on the upper back side of the front backrest 31. After the front backrest 31 is folded forward and connected to the seat cushion assembly 2, the cover plate 7 can rotate forward to cover the gap between the seat cushion assembly 2 and the front backrest 31, ensuring that the surface of the bed is simple and flat and improving the overall aesthetics of the seat.

[0054] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention. Those skilled in the art, under the guidance of the present invention, can make various similar representations without departing from the spirit and claims of the present invention, and such modifications all fall within the protection scope of the present invention.

Claims

1. A deformable seat, comprising a base (1), a seat cushion assembly (2) disposed on the base (1), and a backrest assembly (3) disposed at the rear end of the seat cushion assembly (2), characterized in that: The front end of the seat cushion assembly (2) is rotatably connected to the base (1). The backrest assembly (3) has a front backrest (31) and a rear backrest (32) arranged in an overlapping manner. The lower part of the front backrest (31) is connected to the base (1) in a flip-back manner through a transmission mechanism (A). The rear backrest (32) can be flipped backward relative to the front backrest (31) to a horizontal state. The seat can be transformed from a sitting position to a lying position. In the lying position, the seat cushion assembly (2) flips forward relative to the base (1) to a horizontal position. The front backrest (31) flips forward under the drive of the transmission mechanism (A) to be flush with the rear end of the seat cushion assembly (2). The rear backrest (32) flips backward to a horizontal position. A front connecting rod (B1) and a rear connecting rod (B2) are provided between the seat cushion assembly (2) and the base (1). The upper and lower ends of the front connecting rod (B1) are rotatably connected to the front end of the seat cushion assembly (2) and the base (1), respectively. The upper and lower ends of the rear connecting rod (B2) are rotatably connected to the rear end of the seat cushion assembly (2) and the base (1), respectively. A locking assembly (C) is provided on the seat cushion assembly (2) at the position corresponding to the rotatable connection of the rear connecting rod (B2). The locking assembly (C) is used to switch the seat cushion assembly (2) between maintaining a rotatable connection with the rear connecting rod (B2) and disengaging from the connection. A locking assembly (D) is provided between the front connecting rod (B1) and the base (1). The locking assembly (D) is used to switch the front connecting rod (B1) between maintaining a rotatable connection with the base (1) and a fixed connection. A driver (4) is provided between the seat assembly (2) and the front link (B1), and the driver (4) is used to drive the seat assembly (2) to rotate relative to the front link (B1).

2. The deformable seat according to claim 1, characterized in that: The base (1) is provided with a retaining mechanism (F). When the upper end of the rear link (B2) is disconnected from the seat assembly (2), the retaining mechanism (F) can keep the rear link (B2) locked relative to the base (1).

3. The deformable seat according to claim 2, characterized in that: The retaining mechanism (F) includes a first gear (F1) and a second gear (F2) rotatably mounted on the base (1). The lower end of the front connecting rod (B1) is provided with a first arc-shaped tooth (a) that meshes with the first gear (F1), and the lower end of the rear connecting rod (B2) is provided with a second arc-shaped tooth (b) that meshes with the second gear (F2). The lower end of the first gear (F1) has a first extension (F11) extending downward, and the lower end of the second gear (F2) has a second extension (F21) extending downward. A synchronizing rod (F3) is provided between the lower parts of the first extension (F11) and the second extension (F21). The two ends of the synchronizing rod (F3) are rotatably connected to the lower parts of the first extension (F11) and the second extension (F21), respectively.

4. The deformable seat according to claim 1, characterized in that: The locking assembly (D) includes a locking bracket (D11) fixed on the base (1), a locking rod (D12) located above the locking bracket (D11), and a zipper (D13) connecting the locking bracket (D11) and the locking rod (D12). The lower end of the front link (B1) is rotatably connected to the locking bracket (D11), and the middle part of the locking rod (D12) is hinged to the front link (B1). One end of the locking bracket (D11) is provided with a notch (e), and one end of the locking rod (D12) has a snap-fit ​​part (f) adapted to the notch (e). The zipper (D13) is used to snap the snap-fit ​​part (f) into the notch (e) or to make the snap-fit ​​part (f) move upward away from the notch (e).

5. The deformable seat according to claim 1, characterized in that: The number of the front link (B1) and the rear link (B2) are both provided in two sets. The two sets of the front link (B1) are respectively arranged on both sides of the front end of the seat cushion assembly (2), and the two sets of the rear link (B2) are respectively arranged on both sides of the rear end of the seat cushion assembly (2).

6. The deformable seat according to claim 1, characterized in that: The transmission mechanism (A) includes a first connecting rod (A1) and a second connecting rod (A2) arranged on the side of the front backrest (31). The upper end of the first connecting rod (A1) is rotatably connected to the lower part of the front backrest (31), and the lower end is hinged to the base (1). The upper end of the second connecting rod (A2) is hinged to the lower end of the front backrest (31), and the lower end is hinged to the base (1). An angle adjustment mechanism (5) is provided between the front backrest (31) and the upper end of the first connecting rod (A1), which is used to drive the front backrest (31) to rotate back and forth around the upper end of the first connecting rod (A1).

7. The deformable seat according to claim 6, characterized in that: The first link (A1) and the second link (A2) are arranged from front to back. In the height direction of the front backrest (31), the rotation center of the upper end of the first link (A1) is located above the rotation center of the upper end of the second link (A2).

8. The deformable seat according to claim 1, characterized in that: A flipping drive mechanism (E) is provided between the front backrest (31) and the rear backrest (32), which is used to drive the rear backrest (32) to flip backward relative to the front backrest (31).

9. The deformable seat according to claim 1, characterized in that: The upper end of the front backrest (31) is equipped with a headrest (6) that can be folded forward. The front backrest (31) is provided with a drive mechanism (H) for driving the headrest (6) to rotate back and forth relative to the upper end of the front backrest (31).

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