A sitting / reclining switching mechanism and a seat

Abstract

This invention discloses a sitting / lying-down state switching mechanism and a seat. The mechanism includes a seat and a seat support, with the seat support as the main support. The seat moves relative to the seat support through a first transmission member and a second transmission member, enabling the mechanism to switch between a sitting state and a lying-down state. The seat includes a back assembly, a connecting member, a driving member, and the aforementioned mechanism. The back assembly and the seat are linked together under the drive of the driving member. In the sitting state, the seat is located above the seat support, and the back assembly is vertical. In the lying-down state, the seat descends to the front of the seat support, and the back assembly tilts backward, allowing the user's legs to extend horizontally to the ground, using the ground as a footrest. The feet rest directly on the ground, and the entire ground serves as the user's footrest, resulting in better comfort and more freedom of foot posture.

Description

Technical Field

[0001] This invention relates to the field of seating technology, and in particular to a sitting / reclining switching mechanism and a seat. Background Technology

[0002] A lounge chair is a chair designed for relaxation and enjoyment, featuring thick, soft upholstery for comfort. A massage chair also has thick, soft upholstery and offers a massage function to improve blood circulation. However, both types of chairs share a common drawback: inconvenience in getting in and out. Specifically, lounge chairs and massage chairs usually come with footrests. These footrests take up a lot of space when open, have complex mechanisms, and are costly to maintain. They are also inconvenient to fold or unfold. For example, when getting up, the footrest needs to be retracted; otherwise, it obstructs movement. Furthermore, while footrests improve comfort while reclining, they also increase costs.

[0003] The seat height of a lounge chair is approximately 420-450mm from the ground. If the lounge chair does not have a footrest, the high seat height means that when the chair is in a reclining position, the buttocks are also high off the ground, requiring the thighs and calves to be bent. This puts a heavy burden on blood return and hinders circulation, which can cause discomfort in the legs and feet.

[0004] For existing office chairs, some have footrests and some don't. Office chairs are typically supported by a gas spring, with the gas spring height at its lowest setting between 390-410mm (increasing by 80mm when raised). For office chairs without footrests, even with the backrest reclined, the height from the ground remains relatively high, meaning the legs are dangling, which is uncomfortable. For office chairs with footrests, the footrest can be extended for resting when the backrest is reclined, but getting up is still inconvenient, as opening and closing the footrest is difficult. Especially when the footrest is open and the chair is rotating, even more space is required, which is not conducive to space utilization in the office. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a sitting / lying state switching mechanism, which uses a seat support as the main support, and uses a first transmission member and a second transmission member to move the sitting part relative to the seat support member, so that the mechanism can switch between a sitting state and a lying state.

[0006] Furthermore, a chair is provided in which the backrest assembly and the seat are linked by a drive unit. In the seated state, the seat is located above the seat support and the backrest assembly is vertical. In the reclining state, the seat is lowered to the front of the seat support and the backrest assembly is tilted back, allowing the user's legs to be stretched flat to the ground, using the ground as a footrest. The feet are placed directly on the ground, and the entire ground serves as the user's footrest, resulting in better comfort and more freedom of foot posture.

[0007] The technical solution of this invention is implemented as follows:

[0008] A sitting / reclining switching mechanism includes a seat and a seat support. A transmission assembly is provided between the seat and the seat support to allow the seat to selectively move relative to the seat support in the front-back and vertical directions. The transmission assembly includes a first transmission member and a second transmission member. The two ends of the first transmission member are hinged to the seat and the seat support, respectively, and the two ends of the second transmission member are hinged to the seat and the seat support, respectively. The first transmission member, the second transmission member, the seat, and the seat support together form a four-bar linkage. This sitting / reclining switching mechanism has a sitting state and a reclining state. In the sitting state, the first transmission member... The moving part and the second transmission part are basically upright, and the seat is located above the seat support. At this time, the height of the seat is the sitting height. When switching from the sitting state to the reclining state, the first transmission rod and the second transmission rod rotate relative to the seat support. The upper ends of the first transmission rod and the second transmission rod gradually tilt forward and drive the seat to move forward and downward. When in the reclining state, the seat is located in front of the seat support. At this time, the height of the seat is the reclining height. The sitting height is greater than the reclining height, and the reclining height is configured such that at this height, the user can stretch out or even straighten their legs and place their feet on the ground.

[0009] This seat-to-reclining mechanism allows for movement of the seat relative to the seat support. When switching from a seated to a reclining position, the seat moves forward and downward to the front of the seat support, significantly reducing the height of the seat itself. In the reclining position, the user can use the floor as a footrest, allowing them to stretch or straighten their legs and place them on the ground. This eliminates the need for a footrest, reducing costs, weight, and space requirements.

[0010] Preferably, both the first and second transmission components are U-shaped. The first transmission component includes a first crossbar arranged horizontally, two first connecting arms located at the left and right ends of the first crossbar, and two downwardly extending first connecting ears. The two first connecting arms are hinged to the left and right sides of the seat, and the two first connecting ears are hinged to the left and right sides of the seat support. The second transmission component includes a second crossbar arranged horizontally, two second connecting arms located at the left and right ends of the second crossbar, and two downwardly extending second connecting ears. The two second connecting arms are hinged to the left and right sides of the seat, and the two second connecting ears are hinged to the sides of the seat support. Since both the first and second transmission components are U-shaped, compared to connecting the seat and seat support with a single connecting rod on the left and right sides, this integrated transmission component makes overall assembly simpler and more convenient.

[0011] Preferably, the first connecting arm is L-shaped and configured such that, in a reclining position, the first connecting arm is generally horizontal yet still able to lift the seat upwards. The shape of the first connecting arm is designed to prevent the front end of the seat from tilting downwards.

[0012] Preferably, the seat support is provided with a first limiting plate and a second limiting plate. The first limiting plate is located below and in front of the first connecting ear, and the second limiting plate is located below and in front of the second connecting ear. In the lying position, the first connecting ear abuts against the first limiting plate, and the second connecting ear abuts against the second limiting plate. The first and second limiting plates can provide limiting and support for the first and second transmission components in the lying position, maintaining the stability of the structure.

[0013] Preferably, the first transmission member is located in front of the second transmission member.

[0014] Preferably, the lower end of the first transmission member is hinged to the seat support member, the lower end of the second transmission member is hinged to the seat support member, and the hinge point between the first transmission member and the seat support member is located in front of and below the hinge point between the second transmission member and the seat support member.

[0015] A seat, comprising:

[0016] As described above, in the sitting / lying state switching mechanism, the sitting part is configured to support the human buttocks, and when switching states, the sitting part is linked with a backrest assembly.

[0017] The back assembly is rotatably connected to the seat and is connected to the first transmission component via a connector.

[0018] The connector has two ends that are hinged to the back assembly and the first transmission component, respectively.

[0019] A drive unit is mounted on the seat and drives the first and second transmission components to move.

[0020] In the seated position, the back assembly is roughly vertical; when switching from the seated position to the reclining position, the drive unit drives the back assembly, the connector, the first transmission unit, the second transmission unit, and the seat to move. While the seat moves forward and downward, the back assembly moves forward and downward and rotates backward relative to the seat; in the reclining position, the back assembly is in a backward tilted posture.

[0021] Preferably, the back assembly includes a back drive component and a back frame, the back frame being configured to support the back of the human body, the back drive component being fixedly connected to the back frame; the back drive component is rotatably connected to the seat and is connected to the first drive component via a connector.

[0022] Preferably, the back drive component is U-shaped, including a third crossbar arranged in the left-right direction and a third connecting arm located at the left and right ends of the third crossbar. The left and right ends of the seat are provided with windows for the third connecting arm to pass through, and the third connecting arm passes through the windows from top to bottom and is hinged to the connecting component.

[0023] Preferably, a drive rod is provided between the two third connecting arms in a left-right direction, and the drive member is hinged to the drive rod.

[0024] Preferably, the seat support is connected to a support assembly for supporting the seat, the support assembly including a support leg and a support column, and the seat support is connected to the support column.

[0025] Preferably, the support column is a gas spring, which is inserted into and installed on the seat support. The lifting and lowering of the support column causes the seat support, seat and back assembly to move synchronously, and can adjust the sitting height and lying height.

[0026] Preferably, with the support column retracted to its shortest length, the lying height is 250-280mm, and the sitting height is 420-450mm; the adjustment range of the support column is 100-150mm. This height allows the user to place both feet on the ground without needing to rest their feet, thus stretching their legs; the support column provides adjustable lying and sitting heights to accommodate people of different heights.

[0027] Preferably, the driving component is a spring or an electric push rod.

[0028] Preferably, the system also includes an armrest assembly, which includes an armrest, the rear end of which is hinged to the backrest assembly, and the rear part of the armrest is connected to the seat via a sliding guide mechanism. The armrest can change its tilt angle to increase comfort when switching between reclining and sitting positions.

[0029] Preferably, the slide guide mechanism includes a slide and a guide pin, with the guide pin disposed on one of the armrest and the seat, and the slide disposed on the other of the armrest and the seat.

[0030] The design starting point, concept, and beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0031] 1. This invention is versatile. By eliminating the footrest, it reduces space occupation while simultaneously providing both office and leisure functions. It further lowers the seat height from the ground while ensuring the stability of the overall structure. The minimum seat height from the ground is 260-270mm. Although the footrest component has been eliminated, its function has not been reduced or lost but rather enhanced, resulting in greater leg freedom and comfort in a semi-reclining position.

[0032] 2. In practical applications, the support column also adopts a common gas spring; the base position is further lowered, the upper end of the base is connected to the top of the support column, and the lower end of the base extends downward to the lower end of the support column, so that the lower rotation point of the first and second support arms is as low as possible. When the two fall down, the seat bracket can also be lowered to the lowest position, so that the user can stretch out his legs and put his feet on the ground.

[0033] 3. The seat and reclining switching mechanism and the seat are capable of reclining and sitting postures; the seat bracket, the first support arm, the second support arm and the base form a four-bar linkage mechanism to ensure that the seat bracket can operate smoothly when switching between reclining and sitting postures.

[0034] 4. In the seated position, i.e. the office position, the first and second arms of the four-link chassis are basically in a vertical position. Therefore, when transitioning to a reclining position, the first and second arms have a large range of motion, which allows for greater flexibility in adjusting the seat height and moving the chair forward.

[0035] 5. The key point of this invention is that it solves the problem of seat height, which was a huge challenge in the past and was not as simple as just lowering the gas spring to the lowest position. Through the design of the base, the first and second arms of the four-bar linkage are in an upright position when in a normal office sitting posture. When the posture is changed to a reclining position, the first and second arms fall forward and drive the seat support forward, thereby reducing the height of the seat support.

[0036] Furthermore, the hinge points of the two arms that make up the four-bar linkage can be moved down to the lower end of the base. Even when the gas spring is lowered to its lowest position, the seat bracket will still maintain the same height as before when only the gas spring is used for support in the sitting position. When the sitting position is changed to the reclining position, the seat bracket will move further forward and downward. In other words, when the gas spring is at its lowest height, the height of the seat bracket will be further reduced, making it closer to the ground.

[0037] With a lower seat, the center of gravity is also lower, and the feet rest directly on the ground, making the entire ground the user's footrest, which is more comfortable and allows for more freedom of foot posture. Attached Figure Description

[0038] Figure 1 This is a three-dimensional structural diagram of the seat in the seated state in Embodiment 1 of the present invention. Figure 1 ;

[0039] Figure 2 This is a three-dimensional structural diagram of the seat in the seated state in Embodiment 1 of the present invention. Figure 2 ;

[0040] Figure 3 This is a side view of the seat in the seated state in Embodiment 1 of the present invention;

[0041] Figure 4 This is a three-dimensional structural diagram of the seat in the reclining state in Embodiment 1 of the present invention. Figure 1 ;

[0042] Figure 5 This is a three-dimensional structural diagram of the seat in the reclining state in Embodiment 1 of the present invention. Figure 2 ;

[0043] Figure 6 This is a side view of the seat in a reclining state in Embodiment 1 of the present invention;

[0044] Figure 7 This is a three-dimensional structural diagram of the first transmission component in Embodiment 1 of the present invention;

[0045] Figure 8 This is a three-dimensional structural diagram of the second transmission component in Embodiment 1 of the present invention;

[0046] Figure 9 This is a three-dimensional structural diagram of the seat in Embodiment 1 of the present invention;

[0047] Figure 10 This is a three-dimensional structural diagram of the back transmission component in Embodiment 1 of the present invention;

[0048] Figure 11 This is a schematic diagram illustrating the principle of seat state switching in this invention;

[0049] Figure 12 This is a three-dimensional structural diagram of the seat in the seated state in Embodiment 2 of the present invention;

[0050] Figure 13 This is a three-dimensional structural diagram of the seat in the reclining state in Embodiment 2 of the present invention;

[0051] Figure 14 This is a three-dimensional structural diagram of the first transmission component in Embodiment 2 of the present invention.

[0052] The reference numerals in the attached drawings are as follows: seat 1; support 101; seat support 2; first transmission component 3; first crossbar 31; first connecting arm 32; first connecting ear 33; second transmission component 4; second crossbar 41; second connecting arm 42; second connecting ear 43; back assembly 5; back transmission component 51; third crossbar 511; third connecting arm 512; back frame 52; connector 6; drive component 7; drive rod 8; window 9; pin 10; first limiting piece 11; second limiting piece 12; support foot 13; support column 14; armrest 15; slide groove 16; guide pin 17; fixed shaft 18; shaft seat 19; connecting seat 20. Detailed Implementation

[0053] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0054] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0055] In the description of this invention, the term "at least one" means one or more, unless otherwise expressly defined. The terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] The specific embodiments of the present invention are as follows:

[0057] Example 1: As Figure 1 , 11As shown, the present invention provides a sitting / reclining state switching mechanism, including a seat 1 and a seat support 2. A transmission assembly is provided between the seat 1 and the seat support 2 to allow the seat 1 to selectively move relative to the seat support 2 in the front-back direction and the up-down direction. The transmission assembly includes a first transmission member 3 and a second transmission member 4. The two ends of the first transmission member 3 are respectively hinged to the seat 1 and the seat support 2, and the two ends of the second transmission member 4 are respectively hinged to the seat 1 and the seat support 2. The first transmission member 3, the second transmission member 4, the seat 1, and the seat support 2 together constitute a four-bar linkage mechanism. This sitting / reclining state switching mechanism has a sitting state and a reclining state. In the sitting position, the first transmission component 3 and the second transmission component 4 are basically upright, and the seat part 1 is located above the seat support component 2. At this time, the height of the seat part 1 is the sitting height. When switching from the sitting position to the reclining position, the first transmission rod and the second transmission rod rotate relative to the seat support component 2. The upper ends of the first transmission rod and the second transmission rod gradually tilt forward, driving the seat part 1 to move forward and downward. In the reclining position, the seat part 1 is located in front of the seat support component 2. At this time, the height of the seat part 1 is the reclining height. The sitting height is greater than the reclining height, and the reclining height is configured such that at this height, the user can stretch out or even straighten their legs and place their feet on the ground.

[0058] like Figure 1-7 As shown, a seat is further provided, comprising:

[0059] As described above, in the sitting / lying state switching mechanism, the sitting part 1 is configured to support the human buttocks, and when switching states, the sitting part 1 is linked with a backrest assembly 5.

[0060] The back assembly 5 is rotatably connected to the seat 1 and is connected to the first transmission member 3 via a connector 6.

[0061] Connector 6, with its two ends hinged to the back assembly 5 and the first transmission component 3, respectively;

[0062] The drive component 7 is mounted on the seat 1 and drives the first transmission component 3 and the second transmission component 4 to move.

[0063] In the seated position, the back assembly 5 is roughly vertical; when switching from the seated position to the reclining position, the drive unit 7 drives the back assembly 5, the connector 6, the first transmission unit 3, the second rotating unit, and the seat 1 to move. While the seat 1 moves forward and downward, the back assembly 5 moves forward and downward and rotates backward relative to the seat 1; in the reclining position, the back assembly 5 is in a backward tilted posture.

[0064] Specifically, such as Figure 1 , 4As shown in Figures 7-10, the seat 1 is a horizontally arranged frame structure. In this embodiment, the drive component 7 is an electric push rod, which is installed below the seat 1 in the front-to-back direction. The back assembly 5 includes a back drive component 51 and a back frame 52. The back frame 52 is configured to support the back of the human body. The back drive component 51 and the back frame 52 are fixedly connected by two screws on each side. The back drive component 51 is rotatably connected to the seat. The back drive component 51 is U-shaped and includes a third crossbar 511 arranged in the left-to-right direction and a third connecting arm 512 located at the left and right ends of the third crossbar 511. A drive rod 8 is provided between the three connecting arms 512, arranged in the left-right direction. The drive member 7 is hinged to the drive rod 8, and drives the drive rod 8 to move when the drive member 7 extends or retracts. The back transmission member 51 is connected to the first transmission member 3 through the connector 6. The left and right ends of the seat 1 are provided with windows 9 for the third connecting arm 512 to pass through. The third connecting arm 512 passes through the windows 9 from top to bottom and is hinged to the connector 6. In the seated state, the back frame 52 is roughly vertical, and the back transmission member 51 is also roughly vertical. In the reclining state, the back frame 52 tilts backward, and the back transmission member 51 is roughly horizontal.

[0065] Both the first transmission component 3 and the second transmission component 4 are U-shaped. The first transmission component 3 includes a first crossbar 31 arranged in a left-right direction, two first connecting arms 32 located at the left and right ends of the first crossbar 31, and two downwardly extending first connecting ears 33. The two first connecting arms 32 are hinged to the left and right sides of the seat 1, and the two first connecting ears 33 are hinged to the left and right sides of the seat support 2. Similarly, the second transmission component 4 includes a second crossbar 41 arranged in a left-right direction, two second connecting arms 42 located at the left and right ends of the second crossbar 41, and two downwardly extending second connecting ears 43. The two second connecting arms 42 are hinged to the left and right sides of the seat, and the two second connecting ears 43 are hinged to the sides of the seat support 2. The first connecting ears 33 are hinged to the second connecting ears 43. The ear 43 is connected to the seat support 2 via pin 10. The first connecting arm 32 is L-shaped, and the second connecting arm 42 is roughly straight. The lower end of the first connecting arm 32 is rotatably connected to the lower front part of the seat support 2, and the lower end of the second connecting arm 42 is rotatably connected to the upper rear part of the seat support 2. Both the left and right ends of the seat are provided with upwardly extending supports 101, and the window 9 is opened on the supports 101. The first connecting arm 32 is rotatably connected to the side of the seat support 2, and the upper end of the first connecting arm 32 is rotatably connected to the connecting member 6. The upper end of the second connecting arm 42 is rotatably connected to the lower part of the support 101. The shape of the first connecting arm 32 is configured such that in the lying position, the first connecting arm 32 is roughly horizontal and can still lift the seat 1 upward.

[0066] In the four-bar linkage consisting of the first transmission member 3, the second transmission member 4, the seat 1, and the seat support member 2, the seat support member 2 is the fixed rod. The first transmission member 3 is located in front of the second transmission member 4. The two act as swing arms and, when rotating relative to the seat support member 2, drive the seat 1 to move relative to the seat support member 2. The movement of the seat 1 is different from the rotation of the swing arms such as the first transmission member 3 and the second transmission member 4. The seat 1 can perform planar displacement in the front-back and up-down directions as a whole, so as to further reduce the height of the seat 1 through this mechanism.

[0067] In addition, to increase structural stability and provide sufficient structural support for the seat in a reclining state, the seat support 2 is provided with a first limiting piece 11 and a second limiting piece 12. The first limiting piece 11 and the second limiting piece 12 are provided on both the left and right sides of the seat support 2, and the first limiting piece 11 and the second limiting piece 12 protrude outward from the seat support 2. The first limiting piece 11 is located in front of and below the first connecting ear 33, and the second limiting piece 12 is located in front of and below the second connecting ear 43. In the reclining state, the first connecting ear 33 abuts against the first limiting piece 11, and the second connecting ear 43 abuts against the second limiting piece 12.

[0068] Furthermore, the seat support 2 is connected to a support assembly for supporting the seat. The support assembly includes a support foot 13 and a support column 14, and the seat support 2 is connected to the support column 14. The support column 14 is a gas spring, which is inserted into and installed on the seat support 2. The lifting and lowering of the support column 14 causes the seat support 2, the seat 1, and the backrest assembly 5 to move synchronously, and can adjust the sitting height and reclining height. When the support column 14 is shortened to its shortest position, the reclining height is 250-280mm, the sitting height is 420-450mm, and the adjustment range of the support column 14 is 100-150mm. In this embodiment, the reclining height is 260mm, the sitting height is 430mm, and the adjustment range of the support column 14 is 120mm. The reclining height allows the human body to stretch out or straighten their legs and place their feet on the ground, and the sitting height allows the human body to sit normally. The adjustment of the support column 14 makes the seat suitable for people of different heights.

[0069] Furthermore, to facilitate support for the arms and elbows, the seat also includes an armrest assembly 15. The armrest assembly 15 includes an armrest 15, the rear end of which is hinged to the backrest transmission component 51. The rear part of the armrest 15 is connected to the support 101 via a guide mechanism of a slide groove 16. Specifically, the guide mechanism of the slide groove 16 includes a slide groove 16 and a guide pin 17. The guide pin 17 is disposed on one of the armrest 15 and the support 101, and the slide groove 16 is disposed on the other. In this embodiment, the guide pin 17 is disposed on the upper end of the support 101, and the slide groove 16 is formed on the armrest 15 and is inclined forward and upward. The linked design of the armrest 15 ensures that when the backrest is tilted down, the angle at which the armrest 15 tilts backward is more suitable for the human body's support needs, neither too much nor too little, conforming to ergonomics.

[0070] Example 2: The difference between this example and Example 1 lies only in the structure of the driving component 7 and the first transmission component 3, as well as the connection point of the driving component 7. Specifically:

[0071] like Figure 12-14 As shown, the driving element 7 is a spring, and there are two driving elements 7. The two driving elements 7 are arranged on the left and right below the seat 1. One end of the driving element 7 hooks a fixed shaft 18. The fixed shaft 18 is installed below the seat 1 through two shaft seats 19. The two shaft seats 19 are fixed on the seat 1 on the left and right and protrude downward from the seat 1. The other end of the driving element 7 hooks a driving rod 8. In this embodiment, the driving rod 8 is installed on the first transmission element 3. The first transmission element 3 also includes two connecting seats 20 located between the two first connecting arms 32. The two connecting seats 20 extend upward and forward in the seated state. The driving rod 8 is installed on the two connecting seats 20.

[0072] When the driving component 7 is a spring, the driving force provided by the driving component 7 is passive and uncontrollable, and the driving component 7 only provides driving force when switching from a reclining state to a sitting state. When switching from a sitting state to a reclining state, the user needs to lean back to achieve the state switch. During this process, the driving component 7 will be stretched to generate a greater rebound force, which will become the driving force when switching from a reclining state to a sitting state. In the sitting state, the driving component 7 is already in a stretched state, thereby keeping it in the sitting state and preventing accidental state switching that would affect the user experience. Furthermore, the first transmission component 3 or the second transmission component 4 can be locked by a locking mechanism to lock the state.

Claims

1. A seat, characterized in that include: A sitting / reclining switching mechanism includes a seat and a seat support. A transmission assembly is provided between the seat and the seat support to allow the seat to selectively move relative to the seat support in the forward / backward and vertical directions. The transmission assembly includes a first transmission member and a second transmission member. The two ends of the first transmission member are hinged to the seat and the seat support, respectively. The two ends of the second transmission member are also hinged to the seat and the seat support, respectively. The first transmission member, the second transmission member, the seat, and the seat support together form a four-bar linkage. This sitting / reclining switching mechanism has a sitting state and a reclining state. In the sitting state, the first and second transmission members are basically upright, and the seat is located above the seat support. At this time, the height of the seat is the sitting height. When switching from the sitting state to the reclining state, the first and second transmission members rotate relative to the seat support. The upper ends of the first and second transmission members gradually tilt forward, driving the seat to move forward and downward. In the reclining state, the seat is located in front of the seat support. At this time, the height of the seat is... The height is the reclining height; the sitting height is greater than the reclining height, and the reclining height is configured such that the user can stretch or even straighten their legs and place their feet on the ground at this height; both the first and second transmission components are U-shaped. The first transmission component includes a first horizontal bar arranged along the left and right sides, two first connecting arms located at the left and right ends of the first horizontal bar, and two first connecting ears extending downwards. The two first connecting arms are hinged to the left and right sides of the sitting part, and the two first connecting ears are hinged to the left and right sides of the seat support component; the second transmission component includes a second horizontal bar arranged along the left and right sides, two second connecting arms located at the left and right ends of the second horizontal bar, and two second connecting ears extending downwards. The two second connecting arms are hinged to the left and right sides of the sitting part, and the two second connecting ears are hinged to the sides of the seat support component; the first connecting arms are L-shaped and configured such that in the reclining state, the first connecting arms are approximately horizontal and can still lift the sitting part upwards; the sitting part is configured to support the human buttocks, and when switching states, the sitting part and a backrest assembly are linked; The back assembly is rotatably connected to the seat and is connected to the first transmission component via a connector. The connector has two ends that are hinged to the back assembly and the first transmission component, respectively. A drive unit is mounted on the seat and drives the first and second transmission components to move. The back assembly includes a back drive component and a back frame. The back frame is configured to support the back of the user. The back drive component is fixedly connected to the back frame. The back drive component is rotatably connected to the seat and is connected to the first drive component via a connector. The back drive component is U-shaped and includes a third crossbar arranged in the left-right direction and third connecting arms located at the left and right ends of the third crossbar. Windows are provided at the left and right ends of the seat for the third connecting arms to pass through. The third connecting arms pass through the windows from top to bottom and are hinged to the connector. The first connecting arm is rotatably connected to the side of the seat support component and its upper end is rotatably connected to the connector. A drive rod is provided between the two third connecting arms in the left-right direction. The drive component is hinged to the drive rod and drives the drive rod to move when the drive component extends or retracts. In the seated position, the back assembly is roughly vertical; when switching from the seated position to the reclining position, the drive unit drives the back assembly, the connector, the first transmission unit, the second transmission unit, and the seat to move. While the seat moves forward and downward, the back assembly moves forward and downward and rotates backward relative to the seat; in the reclining position, the back assembly is in a backward tilted posture.

2. The seat according to claim 1, characterized in that: The seat support is provided with a first limiting piece and a second limiting piece. The first limiting piece is located in front of and below the first connecting ear, and the second limiting piece is located in front of and below the second connecting ear. In the lying position, the first connecting ear abuts against the first limiting piece, and the second connecting ear abuts against the second limiting piece.

3. The seat according to claim 1, characterized in that: The first transmission component is located in front of the second transmission component.

4. The seat according to claim 1, characterized in that: The lower end of the first transmission member is hinged to the seat support member, and the lower end of the second transmission member is hinged to the seat support member. The hinge point between the first transmission member and the seat support member is located in front of and below the hinge point between the second transmission member and the seat support member.

5. The seat according to claim 1, characterized in that: A drive rod is provided between the two third connecting arms, arranged in the left-right direction, and the drive member is hinged to the drive rod.

6. The seat according to claim 1, characterized in that: The seat support is connected to a support assembly for supporting the seat. The support assembly includes support legs and a support column, and the seat support is connected to the support column.

7. The seat according to claim 6, characterized in that: The support column is a gas spring, which is inserted into and installed on the seat support. The lifting and lowering of the support column causes the seat support, the seat part and the backrest assembly to move synchronously, and can adjust the sitting height and the reclining height.

8. The seat according to claim 7, characterized in that: With the support column retracted to its shortest length, the lying height is 250-280mm, and the sitting height is 420-450mm; the adjustment range of the support column is 100-150mm.

9. The seat according to claim 1, characterized in that: The driving component is a spring or an electric push rod.

10. The seat according to claim 1, characterized in that: It also includes an armrest assembly, which includes an armrest, the rear end of which is hinged to the backrest assembly, and the rear part of the armrest is connected to the seat via a sliding guide mechanism.

11. The seat according to claim 10, characterized in that: The slide guide mechanism includes a slide and a guide pin. The guide pin is disposed on one of the armrest and the seat, and the slide is disposed on the other of the armrest and the seat.

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