Folding seat with adjustable backrest for commercial vehicle

Abstract

The utility model relates to a folding seat with an adjustable backrest for a commercial vehicle. The folding seat comprises a backrest connecting plate, a seat connecting plate, a middle connecting plate, a seat component and a backrest component, a first angle adjusting assembly is arranged at the bottom end of the backrest assembly; a second angle adjusting assembly is arranged at the end, close to the backrest assembly, of the seat assembly. The other end of the backrest connecting plate is connected with the first angle adjusting assembly; one end of the middle connecting plate is arranged on one side of the first angle adjusting assembly, and the other end is connected with the second angle adjusting assembly; one end of the seat connecting plate is arranged on one side of the second angle adjusting assembly, and the other end is connected with the seat assembly. The backrest assembly is adjusted to be horizontal with the seat assembly through the second angle adjusting assembly, so that the passenger can lie down to have a rest conveniently; the backrest assembly is adjusted towards the seat assembly through the first angle adjusting assembly until the backrest assembly is folded on the seat assembly, the space occupied by the backrest assembly in the commercial vehicle is reduced, and the space storage capacity in the commercial vehicle is improved.

Description

Technical Field

[0001] The utility model relates to a seat, in particular to an adjustable and foldable seat for the backrest of a commercial vehicle. Background Art

[0002] Commercial vehicles are commonly used means of transportation for people's daily travel and business trips. At present, most of the vehicle seats in commercial vehicles have an angle function, that is, the backrest assembly is rotated backward by a certain angle to achieve a basic horizontal state between the backrest assembly and the seat assembly to meet the needs of people when lying down and resting. However, when people do not need to use the seat, whether the backrest assembly of the vehicle seat is in a vertical or horizontal state with the seat assembly, the backrest assembly of the vehicle seat always occupies the interior space of the vehicle, greatly affecting the storage function of the vehicle. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to some extent. For this purpose, the utility model provides an adjustable and foldable seat for the backrest of a commercial vehicle.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an adjustable and foldable seat for the backrest of a commercial vehicle, including a backrest connecting plate, a seat connecting plate, an intermediate connecting plate, a seat assembly and a backrest assembly; a first angle adjustment assembly is provided at the bottom end of the backrest assembly; a second angle adjustment assembly is provided at one end of the seat assembly close to the backrest assembly;

[0005] One end of the backrest connecting plate is connected to the backrest assembly, and the other end is connected to the first angle adjustment assembly; one end of the intermediate connecting plate is arranged on one side of the first angle adjustment assembly, and the other end is connected to the second angle adjustment assembly; one end of the seat connecting plate is arranged on one side of the second angle adjustment assembly, and the other end is connected to the seat assembly;

[0006] The intermediate connecting plate drives the backrest assembly to rotate away from the seat assembly under the action of the second angle adjustment assembly to be in a horizontal state with the seat assembly; the backrest connecting plate drives the backrest assembly to rotate towards the seat assembly under the action of the first angle adjustment assembly to be in a state of being folded on the seat assembly;

[0007] Sponge pads are arranged on both the seat assembly and the backrest assembly.

[0008] In a preferred embodiment of the utility model, the first angle adjustment assembly includes a first angle adjustment motor, a first lead screw, and a first angle disk. The first lead screw is arranged at the axis center of the first angle adjustment motor. The first lead screw is provided with a backrest connecting plate and a first angle disk. One end of the intermediate connecting plate is fixedly provided on one side of the first angle disk through a base; the first angle adjustment motor drives the backrest connecting plate to drive the backrest assembly to rotate towards the seat assembly;

[0009] The second angle adjustment component includes a second angle adjustment motor, a second lead screw, and a second angle disk. The second lead screw is disposed on the axis of the second angle adjustment motor. The other end of an intermediate connecting plate and the second angle disk are provided on the second lead screw. One end of a seat connecting plate is fixedly provided on the second angle disk through a base; the second angle adjustment motor drives the intermediate connecting plate to drive the first angle adjustment component and the backrest component to rotate away from the seat component.

[0010] In a preferred embodiment of the present invention, the backrest connecting plate and the intermediate connecting plate are respectively located on both sides of the first angle disk. A first limit post is provided at one end of the backrest connecting plate disposed on the first lead screw, and a first limit groove is provided at one end of the intermediate connecting plate disposed on the first lead screw. The first limit groove is provided on the side close to the seat component, and the first limit post slidably matches along the first limit groove;

[0011] The intermediate connecting plate and the seat connecting plate are respectively located on both sides of the second angle disk. A second limit post is provided at one end of the intermediate connecting plate disposed on the second lead screw, and a second limit groove is provided at one end of the seat connecting plate disposed on the second lead screw. The second limit groove is provided on the side away from the seat component, and the second limit post slidably matches along the second limit groove.

[0012] In a preferred embodiment of the present invention, a first limit post is provided at one end of the backrest connecting plate disposed on the first lead screw, and a first limit groove is provided at one end of the intermediate connecting plate disposed on the first lead screw. The first limit groove is provided on the side close to the seat component, and the first limit post slidably matches along the first limit groove;

[0013] A second limit post is provided at one end of the intermediate connecting plate disposed on the second lead screw, and a second limit groove is provided at one end of the seat connecting plate disposed on the second lead screw. The second limit groove is provided on the side away from the seat component, and the second limit post slidably matches along the second limit groove.

[0014] In a preferred embodiment of the present invention, both the first limit groove and the second limit groove are 1 / 4 circular arc grooves.

[0015] In a preferred embodiment of the present invention, there are two first angle adjustment motors, which are respectively disposed on both sides of the bottom end of the backrest component. The first lead screw passes through the axes of the two first angle adjustment motors, and the backrest connecting plate, the first angle disk, and the intermediate connecting plate are respectively provided at both ends of the first lead screw;

[0016] There are two second angular adjustment motors, which are respectively arranged on both sides of the seat assembly. The second lead screw passes through the axles of the two second angular adjustment motors, and intermediate connecting plates, second angle discs and seat connecting plates are respectively arranged at both ends of the second lead screw.

[0017] In a preferred embodiment of the present invention, the following three states exist between the backrest assembly and the seat assembly:

[0018] One, vertical state: The seat assembly and the backrest assembly are in a natural vertical state;

[0019] Two, horizontal state: After the seat assembly and the backrest assembly are in a natural vertical state, the second angular adjustment motor drives the second lead screw to rotate, so that the intermediate connecting plate rotates away from the seat assembly along the second angle disc. The intermediate connecting plate drives the first angle disc, the backrest connecting plate and the backrest assembly to rotate away from the seat assembly synchronously until the backrest assembly rotates to be horizontal with the seat assembly;

[0020] Three, folding state: After the seat assembly and the backrest assembly are in a natural vertical state, the first angular adjustment motor drives the first lead screw to rotate, so that the backrest connecting plate drives the backrest assembly to rotate towards the seat assembly until the backrest assembly folds above the seat assembly.

[0021] The beneficial effects of the present invention are as follows: The backrest assembly of the present invention is adjusted to be horizontal with the seat assembly through the second angle adjustment assembly, which is convenient for passengers to lie down and rest; when the seat is not needed, the backrest assembly can be adjusted towards the seat assembly through the first angle adjustment assembly until the backrest assembly folds on the seat assembly, reducing the occupation of the space in the business vehicle by the backrest assembly and improving the space storage capacity in the business vehicle, realizing the multifunctionality of the seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present invention Figure 1 ;

[0023] Figure 2 is Figure 1 an enlarged structural diagram of part A in

[0024] Figure 3 is a schematic structural diagram of the sponge pad of the present invention arranged on the seat assembly and the backrest assembly;

[0025] Figure 4 is a schematic structural diagram of the first angle adjustment assembly and the second angle adjustment assembly of the present invention;

[0026] Figure 5 is a schematic structural diagram of the present invention Figure 2 ;

[0027] Figure 6 is Figure 5 The enlarged structural schematic diagram at position B in the figure;

[0028] Figure 7 is the schematic diagram of the backrest assembly and the seat assembly of the present utility model in a vertical state;

[0029] Figure 8 is the schematic diagram of the backrest assembly and the seat assembly of the present utility model in a horizontal state;

[0030] Figure 9 is the schematic diagram of the state where the backrest assembly of the present utility model is folded on the seat assembly.

[0031] In the figure: backrest connecting plate 1; first limiting post 101; seat connecting plate 2; second limiting groove 201; intermediate connecting plate 3; first limiting groove 301; second limiting post 302; seat assembly 4; backrest assembly 5; first angle adjustment assembly 6; first angle adjustment motor 601; first lead screw 602; first angle disc 603; second angle adjustment assembly 7; second angle adjustment motor 701; second lead screw 702; second angle disc 703; sponge pad 8. Specific embodiments

[0032] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0034] As Figures 1 to 9A business vehicle backrest adjustable folding seat is shown, which includes a backrest connecting plate 1, a seat connecting plate 2, an intermediate connecting plate 3, a seat assembly 4 and a backrest assembly 5; a first angle adjustment assembly 6 is provided at the bottom end of the backrest assembly 5; a second angle adjustment assembly 7 is provided at one end of the seat assembly 4 close to the backrest assembly;

[0035] One end of the backrest connecting plate 1 is connected to the backrest assembly 5, and the other end is connected to the first angle adjustment assembly 6; one end of the intermediate connecting plate 3 is arranged on one side of the first angle adjustment assembly 6, and the other end is connected to the second angle adjustment assembly 7; one end of the seat connecting plate 2 is arranged on one side of the second angle adjustment assembly 7, and the other end is connected to the seat assembly 4;

[0036] Under the action of the second angle adjustment assembly 7, the intermediate connecting plate 3 drives the backrest assembly 5 to rotate away from the seat assembly to a horizontal state with the seat assembly 4; under the action of the first angle adjustment assembly 6, the backrest connecting plate 1 drives the backrest assembly 5 to rotate towards the seat assembly 4 to a state of being folded on the seat assembly 4;

[0037] Sponge pads 8 are provided on both the seat assembly 4 and the backrest assembly 5.

[0038] Among the backrest assembly and the seat assembly in this application, there are the following three states:

[0039] I. Vertical state: The backrest assembly 5 and the seat assembly 4 are in a natural vertical state. The seat assembly is convenient for customers to sit, and the backrest assembly 5 provides back support for customers. At this time, the folding seat realizes the normal function of the seat, and passengers can sit normally;

[0040] II. Horizontal state: After the backrest assembly 5 and the seat assembly 4 are in a natural vertical state, the second angle adjustment assembly 7 is started. The second angle adjustment assembly 7 drives the intermediate connecting plate 3, the first angle adjustment assembly 6, the backrest connecting plate 1, and the backrest assembly 5 to rotate away from the seat assembly 4 until the backrest assembly 5 and the seat assembly 4 are in a horizontal state. At this time, the backrest assembly 5 and the seat assembly 4 realize the extension of the seating area, and the support of the backrest assembly 5 for the back is cancelled. The horizontal structure between the backrest assembly 5 and the seat assembly 4 forms a flat support structure similar to a bed, which is convenient for passengers to lie on the seat, improves comfort, and increases the functionality of the seat; when passengers do not need to lie down and rest, the second angle adjustment assembly 7 can be started to realize the intermediate connecting plate 3, the first angle adjustment assembly 6, and the backrest connecting plate 1 driving the backrest assembly 5 to rotate towards the seat assembly 4, and finally the backrest assembly 5 and the seat assembly 4 are in a natural state;

[0041] III. Folded state: After the seat assembly 4 and the backrest assembly 5 are in a natural vertical state, start the first angle adjustment assembly 6. Drive the backrest connection plate 1 and the backrest assembly 5 to move towards the seat assembly 4 through the first angle adjustment assembly 6 until the backrest assembly 5 is folded on the seat assembly 4. At this time, the backrest assembly 5 is folded on the seat assembly 4, reducing the occupancy of the space in the business car when the backrest assembly 5 is in the vertical or horizontal state, facilitating the placement of luggage or items on the backrest assembly 4, increasing the volume inside the vehicle, and improving the versatility of the folding seat.

[0042] As a preferred embodiment, the first angle adjustment assembly 6 includes a first angle adjustment motor 601, a first lead screw 602, and a first angle disc 603. The first lead screw 602 is disposed at the axis of the first angle adjustment motor 601. The first lead screw 602 is provided with a backrest connection plate 1 and a first angle disc 603. One end of an intermediate connection plate 3 is fixedly provided on one side of the first angle disc 603 through a base; the first angle adjustment motor 601 drives the backrest connection plate 1 to drive the backrest assembly 5 to rotate towards the seat assembly 4.

[0043] The second angle adjustment assembly 7 includes a second angle adjustment motor 701, a second lead screw 702, and a second angle disc 703. The second lead screw 702 is disposed on the axis of the second angle adjustment motor 701. The second lead screw 702 is provided with the other end of the intermediate connection plate 3 and the second angle disc 703. One end of a seat connection plate 2 is fixedly provided on the second angle disc 703 through a base; the second angle adjustment motor 701 drives the intermediate connection plate 3 to drive the first angle adjustment assembly 6 and the backrest assembly 5 to rotate away from the seat assembly 4.

[0044] When it is necessary to adjust the backrest assembly 5 and the seat assembly 4 from the natural vertical state to the state where the backrest assembly 5 is adjusted to be horizontal with the seat assembly 4, first start the second angle adjustment motor 701. Then the second angle adjustment motor 701 rotates to drive the second lead screw 702 to rotate. The second lead screw 702 drives the intermediate connection plate 3 and the second angle disc 703 provided on the second lead screw 702 to rotate. Then the second lead screw 702 drives the intermediate connection plate 3, the first angle adjustment assembly 6, the backrest connection plate 1, and further drives the backrest assembly 5 to rotate until the backrest assembly 5 rotates to be horizontal with the seat assembly 4, realizing the adjustment of the backrest assembly 5 and making the whole seat in a horizontal state, facilitating passengers to lie down and rest.

[0045] When it is necessary to adjust the backrest assembly 5 and the seat assembly 4 from the natural vertical state to the state where the backrest assembly 5 is folded on the seat assembly 4, first start the first angle adjustment motor 601. Then, the first angle adjustment motor 601 drives the first lead screw 602 to rotate. The first lead screw 602 drives the backrest connection plate 1, and further drives the backrest assembly 5 to rotate towards the seat assembly 4 until the backrest assembly 5 is completely folded on the seat assembly 1, reducing space occupancy, improving the in-vehicle storage capacity, and enhancing the versatility of the seat.

[0046] As a preferred implementation manner, the backrest connection plate 1 and the intermediate connection plate 3 in the present application are respectively located on both sides of the first angle disc 603. A first limit post 101 is provided at one end of the backrest connection plate 1 arranged on the first lead screw 602, and a first limit groove 301 is provided at one end of the intermediate connection plate 3 arranged on the first lead screw 602. The first limit groove 301 is arranged close to the seat assembly 4 side, and the first limit post 101 slidably matches along the first limit groove 301; since one end of the intermediate connection plate 3 is fixed to one side of the first angle disc 603 through a base, when the first lead screw 602 drives the backrest connection plate 1 and further drives the backrest assembly 5 to rotate towards the seat assembly 4, one end of the intermediate connection plate 3 always remains stationary; that is, during the process of the first angle adjustment motor 601 driving the first lead screw 602 to drive the backrest connection plate 1 to rotate, the first limit post 101 on the backrest connection plate 1 slides along the corresponding first limit groove 301, improving the stability of the backrest connection plate 1 rotating towards the seat assembly 4; and the first limit groove 301 in the present application is a 1 / 4 circular arc groove, and the sliding angle of the first limit post 101 along the first limit groove 301 is 90°, that is, the angle between the starting position and the ending position of the first limit post 101 sliding along the first limit groove 301 and the center of the circle is 90°, realizing that the backrest connection plate 1 drives the backrest assembly 5 to rotate 90°, and finally realizing the complete folding of the backrest assembly 5 on the seat assembly 4;

[0047] The intermediate connecting plate 3 and the seat connecting plate 2 are respectively located on both sides of the second angle disc 703. A second limit post 302 is provided at one end of the intermediate connecting plate 3 arranged on the second lead screw 702, and a second limit groove 201 is provided at one end of the seat connecting plate 2 arranged on the second lead screw 702. The second limit groove 201 is arranged on the side away from the seat assembly 4, and the second limit post 302 is slidably matched along the second limit groove 201; since the seat connecting plate 2 is fixedly arranged on one side of the second angle disc 703 through a base, during the rotation of the intermediate connecting plate 3, the first angle adjustment assembly 6, and the backrest connecting plate 1 driving the backrest assembly 5, the seat connecting plate 2 always remains stationary; when the second angle adjustment motor 701 drives the second lead screw 702 to drive the intermediate connecting plate 3 to rotate, the second limit post 302 arranged on the intermediate connecting plate 3 slides along the second limit groove 201 on the corresponding seat connecting plate, ensuring the stability of the intermediate connecting plate 3 driving the backrest assembly to rotate away from the seat assembly; at the same time, the second limit groove 201 is a 1 / 4 circular arc groove, and the angle of the second limit post 302 sliding along the second limit groove 201 is 90°, that is, the angle between the starting position and the ending position of the second limit post 302 sliding along the second limit groove 201 and the center of the circle is 90°, realizing that the intermediate connecting plate 3 drives the backrest assembly 5 to rotate away from the seat assembly by 90°, and finally realizing that the backrest assembly 5 is horizontal with the seat assembly 4, extending the overall length of the seat and facilitating the passenger to lie down and rest.

[0048] As a preferred implementation manner, there are two first angle adjustment motors 601 in the present application, which are respectively arranged on both sides of the bottom end of the backrest assembly 5. The first lead screw 602 passes through the axes of the two first angle adjustment motors 601. The two ends of the first lead screw 602 are respectively provided with the backrest connecting plate 1, the first angle disc 603 and the intermediate connecting plate 3;

[0049] There are two second angle adjustment motors 701, which are respectively arranged on both sides of the seat assembly 4. The second lead screw 702 passes through the axes of the two second angle adjustment motors 701. The two ends of the second lead screw 702 are respectively provided with the intermediate connecting plate 3, the second angle disc 703 and the seat connecting plate 2. The arrangement of the two first angle adjustment motors 601 and the two second angle adjustment motors 701 is beneficial to improving the driving stability of the first lead screw 602 and the second lead screw 702, and improving the driving stability of the backrest assembly rotating towards or away from the seat assembly.

[0050] In the description of this specification, the descriptions referring to terms such as "one embodiment", "certain embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the said embodiments or examples are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0051] In summary, although the present utility model has been disclosed above with the preferred embodiments, the above preferred embodiments are not intended to limit the present utility model. Those of ordinary skill in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the scope defined by the claims.

Claims

1. A business vehicle backrest adjustable folding seat, characterized in that, It includes a backrest connecting plate (1), a seat connecting plate (2), an intermediate connecting plate (3), a seat assembly (4) and a backrest assembly (5); a first angle adjustment assembly (6) is provided at the bottom end of the backrest assembly (5); a second angle adjustment assembly (7) is provided at one end of the seat assembly (4) close to the backrest assembly; One end of the backrest connecting plate (1) is connected to the backrest assembly (5), and the other end is connected to the first angle adjustment assembly (6); one end of the intermediate connecting plate (3) is arranged on one side of the first angle adjustment assembly (6), and the other end is connected to the second angle adjustment assembly (7); one end of the seat connecting plate (2) is arranged on one side of the second angle adjustment assembly (7), and the other end is connected to the seat assembly (4); Under the action of the second angle adjustment assembly (7), the intermediate connecting plate (3) drives the backrest assembly (5) to rotate away from the seat assembly to a horizontal state with the seat assembly (4); under the action of the first angle adjustment assembly (6), the backrest connecting plate (1) drives the backrest assembly (5) to rotate towards the seat assembly (4) to a state of being folded on the seat assembly (4); Sponge pads (8) are provided on both the seat assembly (4) and the backrest assembly (5).

2. The adjustable and foldable seat back of the commercial vehicle according to claim 1, characterized in that, The first angle adjustment assembly (6) includes a first angle adjustment motor (601), a first lead screw (602), and a first angle disc (603). The first lead screw (602) is arranged at the axis center of the first angle adjustment motor (601). The first lead screw (602) is provided with the backrest connecting plate (1) and the first angle disc (603). One end of the intermediate connecting plate (3) is fixedly provided on one side of the first angle disc (603) through a base; the first angle adjustment motor (601) drives the backrest connecting plate (1) to drive the backrest assembly (5) to rotate towards the seat assembly (4); The second angle adjustment assembly (7) includes a second angle adjustment motor (701), a second lead screw (702) and a second angle disc (703). The second lead screw (702) is arranged at the axis center of the second angle adjustment motor (701). The second lead screw (702) is provided with the other end of the intermediate connecting plate (3) and the second angle disc (703). One end of the seat connecting plate (2) is fixedly arranged on the second angle disc (703) through a base; the second angle adjustment motor (701) drives the intermediate connecting plate (3) to drive the first angle adjustment assembly (6) and the backrest assembly (5) to rotate away from the seat assembly (4).

3. The adjustable and foldable seat back of the commercial vehicle according to claim 2, wherein, The backrest connecting plate (1) and the intermediate connecting plate (3) are respectively located on both sides of the first angle disc (603). A first limit post (101) is provided at one end of the backrest connecting plate (1) arranged on the first lead screw (602). A first limit groove (301) is provided at one end of the intermediate connecting plate (3) arranged on the first lead screw (602). The first limit groove (301) is arranged on the side close to the seat assembly (4), and the first limit post (101) slidably matches along the first limit groove (301); The intermediate connecting plate (3) and the seat connecting plate (2) are respectively located on both sides of the second angle disc (703). One end of the intermediate connecting plate (3) arranged on the second lead screw (702) is provided with a second limit post (302), and one end of the seat connecting plate (2) arranged on the second lead screw (702) is provided with a second limit groove (201). The second limit groove (201) is arranged on the side far from the seat assembly (4), and the second limit post (302) slides along the second limit groove (201) in a matching manner.

4. The adjustable and foldable seat back of a commercial vehicle according to claim 3, wherein, Both the first limit groove (301) and the second limit groove (201) are 1 / 4 circular arc grooves.

5. The business vehicle backrest adjustable folding seat according to claim 2, wherein, There are two first angle adjustment motors (601), which are respectively arranged on both sides of the bottom end of the backrest assembly (5). The first lead screw (602) passes through the axes of the two first angle adjustment motors (601). The two ends of the first lead screw (602) are respectively provided with the backrest connecting plate (1), the first angle disc (603) and the intermediate connecting plate (3); There are two second angle adjustment motors (701), which are respectively arranged on both sides of the seat assembly (4). The second lead screw (702) passes through the axes of the two second angle adjustment motors (701). The two ends of the second lead screw (702) are respectively provided with the intermediate connecting plate (3), the second angle disc (703) and the seat connecting plate (2).

6. The adjustable and foldable seat back of a commercial vehicle according to any one of claims 1-5, characterized in that, The following three states exist between the backrest assembly and the seat assembly: I. Vertical state: The seat assembly (4) and the backrest assembly (5) are in a natural vertical state; II. Horizontal state: After the seat assembly (4) and the backrest assembly (5) are in a natural vertical state, the second angle adjustment motor (701) drives the second lead screw (702) to rotate, so as to realize the rotation of the intermediate connecting plate (3) along the second angle disc (703) to the side far from the seat assembly (4). The intermediate connecting plate (3) drives the first angle disc (603), the backrest connecting plate (1) and the backrest assembly (5) to rotate synchronously to the side far from the seat assembly (4) until the backrest assembly (5) rotates to be horizontal with the seat assembly (4); III. Folding state: After the seat assembly (4) and the backrest assembly (5) are in a natural vertical state, the first angle adjustment motor (601) drives the first lead screw (602) to rotate, so as to realize the rotation of the backrest connecting plate (1) driving the backrest assembly (5) towards the direction close to the seat assembly (4) until the backrest assembly (5) folds above the seat assembly (4).

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