Electrically driven rail transit linkage seat

Abstract

An electric rail transit linkage seat comprises a base, a seat cushion and a backrest installed on the base, a seat cushion framework arranged at the bottom of the seat cushion, a backrest framework arranged on the backrest, a backrest adjusting mechanism arranged on the base and capable of independently controlling the angle adjustment of the backrest, and a seat cushion adjusting mechanism arranged on the base and capable of realizing the synchronous adjustment of the seat cushion and the backrest in cooperation with the backrest adjusting mechanism. Compared with the prior art, when the angle of the seat cushion is adjusted, the seat cushion adjusting mechanism and the backrest adjusting mechanism are linked, the synchronous adjustment of the seat cushion and the backrest is realized, the rotation center of the seat cushion and the backrest is ensured to be close to the rotation center of the human body, the contact surface of the back and the backrest is more fitted when the angle of the backrest is changed, the supporting area is improved, the feeling of pulling or extruding is reduced, and the riding experience of passengers is improved.

Description

Technical Field

[0001] This invention relates to the field of seating technology, and more specifically to an electric rail transit linkage seat. Background Technology

[0002] Today, with the development of science and technology, rail transit has become an integral part of people's daily lives due to its convenience and speed. The user experience of high-speed trains and bullet trains largely depends on the comfort of the seats. Seat comfort directly determines passenger comfort. In my country, almost all train seats have adjustable backrests, which greatly alleviates fatigue in the upper body. However, the fixed seat cushion design prevents the lower body from relaxing, leading to discomfort during long journeys.

[0003] To address the aforementioned issues, Chinese Patent Application No. 202010771939.3 discloses a novel chair with a linked backrest and seat frame. This novel chair includes a fixed frame, a rotating frame, a seat frame, a backrest frame, a gas spring, and an armrest frame. The fixed frame is located at the bottom of the rotating frame, and the rotating frame is rotatably connected to the fixed frame. The seat frame is mounted on the rotating frame and slidably connected to it. The backrest frame is hinged to the seat frame. One end of the gas spring is hinged to the bottom of the backrest frame, and the other end is fixedly mounted on the rotating frame. A backrest cover is provided on the outside of the backrest frame. The armrest frame is fixedly mounted on the rotating frame and sleeved on the outside of the backrest cover. The backrest frame and the armrest frame are slidably connected. Chinese Patent Application No. 202320523747.X discloses a seat back and seat cushion linkage mechanism. In the disclosed linkage mechanism, the bottom of the backrest frame and the seat cushion frame are rotatably connected together to form a seat frame; both sides of the seat frame are provided with armrests, the bottom of which is mounted on a base frame, and the base frame is provided with a gas spring mounting seat; the inner side of the armrests is provided with a first groove, a second groove, and a third groove; a shaft is passed through the backrest frame, and both ends of the shaft are provided with sliding rollers, which are rolled in the first groove; the side beams of the seat cushion frame are provided with sliding rollers, which are rolled in the second and third grooves, respectively.

[0004] The aforementioned prior art uses a gas spring to move the seat frame, and leaning back causes the backrest to rotate backward, thus linking the backrest and the seat frame. All of these linkage methods rely on human power, and the seat frame can only move horizontally. When the seat frame moves forward and the backrest tilts backward, the rotation center of the seat backrest does not coincide with the rotation center of the human body. This causes the originally close contact surface to become loose when the backrest angle changes, resulting in a pulling or squeezing sensation during adjustment. This reduces the user's comfort after prolonged use. Summary of the Invention

[0005] The present invention aims to overcome the defects in the prior art and provide an electric rail transit linkage seat that can realize synchronous rotation and adjustment of the seat cushion and backrest, thereby improving human comfort.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: an electric rail transit linkage seat, comprising a base and a seat cushion and a backrest mounted on the base, wherein a seat cushion frame is provided at the bottom of the seat cushion and a backrest frame is provided on the backrest, the base is provided with a backrest adjustment mechanism that can independently control the backrest angle adjustment, and the base is also provided with a seat cushion adjustment mechanism that cooperates with the backrest adjustment mechanism to realize synchronous adjustment of the seat cushion and the backrest; the backrest adjustment mechanism includes a backrest gas spring hinged to the backrest frame and the seat cushion frame, the seat cushion adjustment mechanism includes a seat cushion motor for adjusting the seat cushion, and the base is provided with a first slide rail and a second slide rail connected to the seat cushion frame at an angle, the seat cushion frame sliding along the first slide rail and the second slide rail.

[0007] As a preferred embodiment of the present invention, the seat cushion frame is provided with a seat cushion groove, and the backrest frame is provided with a slide bar that is slidably connected to the seat cushion groove.

[0008] As a preferred embodiment of the present invention, a base groove is formed on the base, the base groove has an arc-shaped structure, and the end of the backrest frame is provided with a roller connected to the base groove.

[0009] In a preferred embodiment of the present invention, the two ends of the backrest gas spring are respectively connected to the end of the seat cushion frame and the end of the backrest frame, and the roller and the backrest gas spring are connected to the same end of the backrest frame.

[0010] In a preferred embodiment of the present invention, the seat cushion motor is hinged to the base, the output end of the seat cushion motor is hinged to the end of the seat cushion frame, and the seat cushion motor and the backrest gas spring are connected to the same end of the seat cushion frame.

[0011] As a preferred embodiment of the present invention, the first slide rail and the second slide rail are tilted in the same direction, and the tilt angle of the first slide rail is smaller than the tilt angle of the second slide rail.

[0012] As a preferred embodiment of the present invention, the two ends of the seat cushion frame are respectively provided with a first slider and a second slider, the first slider being slidably connected to a first slide rail, and the second slider being slidably connected to a second slide rail.

[0013] As a preferred embodiment of the present invention, the end of the seat cushion is further provided with a leg rest for supporting the legs, the leg rest is provided with a leg rest frame, and the base is provided with a drive mechanism for controlling the leg rest to flip and extend.

[0014] As a preferred embodiment of the present invention, the driving mechanism includes a leg support motor and a flipping gas spring connected to the leg support frame. The leg support motor is hinged to the base, and the output end of the leg support motor is connected to a lead screw. The end of the lead screw is hinged to the leg support frame, and the two ends of the flipping gas spring are respectively hinged to the leg support frame and the base.

[0015] In a preferred embodiment of the present invention, the leg support frame includes a first connecting plate and a second connecting plate that are slidably connected. The leg support is disposed on the first connecting plate, and the second connecting plate is hinged to the seat cushion. A telescopic gas spring for controlling the movement of the first connecting plate is provided between the first connecting plate and the second connecting plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The backrest adjustment mechanism allows for independent adjustment of the backrest tilt angle to meet the human body's leaning needs. In addition, the seat cushion adjustment mechanism allows for automatic adjustment of the seat cushion angle, eliminating the need for manual adjustment. When adjusting the seat cushion angle, the seat cushion adjustment mechanism is linked with the backrest adjustment mechanism to achieve synchronous adjustment of the seat cushion and backrest, ensuring that the rotation center of the seat cushion and backrest is close to the rotation center of the human body. Furthermore, when changing the backrest angle, the backrest and backrest contact surfaces fit more closely, increasing the support area and reducing pulling or squeezing sensations, thus improving the passenger's riding experience.

[0018] 2. Furthermore, by setting a leg rest at the end of the seat cushion and setting a drive mechanism on the base to drive the leg rest to flip and extend, the leg rest can be adjusted, thereby providing support for the legs and improving passenger comfort. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the seat cushion adjustment mechanism of the present invention;

[0021] Figure 3 This is a schematic diagram of the backrest adjustment mechanism of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the seat cushion and backrest after adjustment according to the present invention;

[0023] Figure 5 This is a schematic diagram of the leg support structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the drive mechanism;

[0025] Figure 7 This is a structural diagram of the leg support frame.

[0026] Reference numerals: Base 1, Base slide 101, Seat cushion 2, Seat cushion frame 201, Seat cushion slide 2011, First slider 2012, Second slider 2013, Connector 2014, Backrest 3, Backrest frame 301, Slide bar 3011, Roller 3012, Leg rest 4, Leg rest frame 401, First connecting plate 4011, Linear slider 4012, Second connecting plate 4013, Linear slide rail 4014, Tilting gas spring connecting plate 4015, Leg rest motor connecting plate 4016, Backrest adjustment mechanism 5, Backrest gas spring 501, Seat cushion adjustment mechanism 6, Seat cushion motor 601, First slide rail 602, Second slide rail 603, Drive mechanism 7, Leg rest motor 701, Lead screw 7011, Tilting gas spring 702, First Tilting gas spring 702, Gas spring connector 7022, Second Tilting gas spring 7023, Telescopic gas spring 703. Detailed Implementation

[0027] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] Example 1

[0029] like Figures 1-4 As shown, an electric rail transit linkage seat includes a base 1 and a seat cushion 2 and a backrest 3 mounted on the base 1. The seat cushion 2 has a seat cushion frame 201 at its bottom, and the backrest 3 has a backrest frame 301. The base 1 has a backrest adjustment mechanism 5 that can independently control the angle adjustment of the backrest 3. The base 1 also has a seat cushion adjustment mechanism 6 that cooperates with the backrest adjustment mechanism 5 to realize the synchronous adjustment of the seat cushion 2 and the backrest 3. The backrest adjustment mechanism 5 includes a backrest gas spring 501 hinged to the backrest frame 301 and the seat cushion frame 201. The seat cushion adjustment mechanism 6 includes a seat cushion motor 601 for adjusting the seat cushion 2. The base 1 is inclinedly provided with a first slide rail 602 and a second slide rail 603 connected to the seat cushion frame 201. The seat cushion frame 201 slides along the first slide rail 602 and the second slide rail 603.

[0030] Furthermore, both the seat cushion 2 and the backrest 3 are movably mounted on the base 1. The seat cushion frame 201 supports the seat cushion 2 and, under the action of the seat cushion adjustment mechanism 6, drives the seat cushion 2 to adjust. The backrest adjustment mechanism 5 can achieve independent adjustment of the backrest 3. At the same time, the backrest adjustment mechanism 5 can cooperate with the seat cushion adjustment mechanism 6 to achieve linkage adjustment of the seat cushion 2 and the backrest 3, ensuring that the rotation center of the seat cushion 2 and the backrest 3 is close to the rotation center of the human body. When changing the angle of the backrest 3, the contact surface between the back and the backrest 3 is more closely fitted, the support area is increased, and the pulling or squeezing sensation is reduced, thus improving the passenger's riding experience.

[0031] The seat cushion frame 201 is provided with a seat cushion groove 2011, and the backrest frame 301 is provided with a slide bar 3011 that is slidably connected in the seat cushion groove 2011. Furthermore, the seat cushion groove 2011 has an arc-shaped structure, and the slide bar 3011 is slidably connected in the seat cushion groove 2011. When the angle of the backrest 3 is adjusted, the slide bar 3011 slides in the seat cushion groove 2011. At the same time, the sliding distance of the slide bar 3011 can be limited by the seat cushion groove 2011, thereby limiting the adjustment angle of the backrest 3.

[0032] A base groove 101 is formed on the base 1. The base groove 101 has an arc-shaped structure. The end of the backrest frame 301 is provided with a roller 3012 connected to the base groove 101. Furthermore, the base groove 101 is arranged along the length direction of the base 1, and the height of the end of the base groove 101 near the backrest 3 is higher than the height of the end away from the backrest 3. The roller 3012 is rotatably connected to the end of the backrest frame 301 and slidably connected to the base groove 101. When the angle of the backrest 3 changes, the roller 3012 moves in the base groove 101.

[0033] The backrest gas spring 501 is connected at both ends to the ends of the seat cushion frame 201 and the backrest frame 301, respectively. The roller 3012 is connected to the backrest gas spring 501 at the same end of the backrest frame 301. Furthermore, the end of the backrest gas spring 501 is hinged to the end of the backrest frame 301. This hinge point is located at the same end of the backrest frame 301 as the roller 3012. The output end of the backrest gas spring 501 is hinged to the end of the seat cushion frame 201. When the backrest 3 is flipped backward, the backrest gas spring 501 is in a compressed state. At the same time, when the seat cushion adjustment mechanism 6 adjusts the angle of the seat cushion 2, the output end of the backrest gas spring 501 is hinged to the seat cushion frame 201, thereby driving the backrest 3 to adjust, realizing the linkage between the seat cushion 2 and the backrest 3.

[0034] The seat cushion motor 601 is hinged to the base 1, and the output end of the seat cushion motor 601 is hinged to the end of the seat cushion frame 201. The seat cushion motor 601 and the backrest gas spring 501 are connected to the same end of the seat cushion frame 201. Furthermore, the middle part of the seat cushion motor 601 is hinged to the base 1, and the output end of the seat cushion motor 601 is connected to a lead screw, which is hinged to the end of the seat cushion frame 201. At the same time, this hinge point is located on the same end as the hinge point between the backrest gas spring 501 and the seat cushion frame 201. By driving the lead screw to extend and retract through the seat cushion motor 601, the angle of the seat cushion 2 can be adjusted.

[0035] The first slide rail 602 and the second slide rail 603 have the same tilt direction, and the tilt angle of the first slide rail 602 is smaller than that of the second slide rail 603. Furthermore, the first slide rail 602 is located near the front end of the seat cushion 2, and the second slide rail 603 is located near the rear end of the seat cushion 2. The front ends of both the first slide rail 602 and the second slide rail 603 are tilted downwards, and the tilt angle of the first slide rail 602 is smaller than that of the second slide rail 603. This allows the front end of the seat cushion 2 to remain stationary while the rear end of the seat cushion 2 sinks significantly, thus changing the angle of the seat cushion 2 without encroaching on the upper space.

[0036] The seat cushion frame 201 has a first slider 2012 and a second slider 2013 at its two ends. The first slider 2012 is slidably connected to the first slide rail 602, and the second slider 2013 is slidably connected to the second slide rail 603. Furthermore, the first slider 2012 and the second slider 2013 are respectively connected to the front end and the rear end of the seat cushion frame 201, and a connector 2014 is hinged to the front end of the seat cushion frame 201. The first slider 2012 is fixedly mounted on the connector 2014. The first slider 2012 slides in the first slide rail 602, and the second slider 2013 slides in the second slide rail 603. Thus, when adjusting the seat cushion 2, the front end of the seat cushion 2 does not lift up, while the rear end of the seat cushion 2 sinks to a greater extent.

[0037] It should also be noted that the seat is equipped with buttons for controlling the operation of the backrest adjustment mechanism 5 and the seat cushion adjustment mechanism 6.

[0038] When the passenger only needs to adjust the backrest 3 angle, the backrest gas spring 501 can be unlocked by controlling the button. At the same time, applying pressure to the backrest 3 will cause the backrest 3 to rotate along the seat cushion slide 2011. Since the center of the seat cushion slide 2011 is close to the center point of human body rotation, the backrest angle can be changed with zero misalignment. When the passenger adjusts the backrest 3 angle to a suitable position, the backrest gas spring 501 can be locked by releasing the button to fix the position of the backrest 3. To reset, simply press the button again to unlock the backrest gas spring 501.

[0039] When a passenger needs to adjust the angle of the seat cushion 2 to achieve a reclining position, the seat cushion motor 601 can be activated to extend the lead screw, causing the seat cushion 2 to move along the first slide rail 602 and the second slide rail 603. Since both the first slide rail 602 and the second slide rail 603 are inclined downwards, and the inclination angle of the first slide rail 602 is smaller than that of the second slide rail 603, the front end of the seat cushion 2 can remain upright while the rear end of the seat cushion 2 sinks significantly. This allows the angle of the seat cushion 2 to be changed without encroaching on the upper space. At the same time, the backrest gas spring 501 unlocks, and the rotation of the seat cushion 2 causes the seat cushion frame 201 to drive the rollers 3012 on the backrest frame 301 to move along the base slide groove 101, thus realizing the linkage between the seat cushion 2 and the backrest 3. When the seat cushion motor 601 retracts the lead screw, the seat can be reset.

[0040] Example 2

[0041] like Figures 5-7 As shown, in this embodiment, the end of the seat cushion 2 is also provided with a leg support 4 for supporting the legs. The leg support 4 is provided with a leg support frame 401, and the base 1 is provided with a drive mechanism 7 for controlling the leg support 4 to flip and extend.

[0042] Furthermore, the drive mechanism 7 includes a leg support motor 701 and a flipping gas spring 702 connected to the leg support frame 401. The leg support motor 701 is hinged to the base 1, and a lead screw 7011 is connected to the output end of the leg support motor 701. The end of the lead screw 7011 is hinged to the leg support frame 401. The two ends of the flipping gas spring 702 are respectively hinged to the leg support frame 401 and the base 1. Specifically, the middle part of the leg support motor 701 is hinged to the base 1, and the end of the lead screw 7011 is hinged to the leg support frame 401. The leg support motor 701 controls the lead screw 7011 to extend, thereby flipping the leg support 4 outward. In addition, the flipping gas spring 702 includes a first flipping gas spring 7021 and a second flipping gas spring. 7023, a gas spring connector 7022 is connected between the first flip gas spring 7021 and the second flip gas spring 7023. The output end of the first flip gas spring 7021 is hinged to the leg support frame 401. The bottom of the first flip gas spring 7021 is fixedly mounted on the gas spring connector 7022. The output end of the second flip gas spring 7023 is fixedly connected to the gas spring connector 7022. The bottom of the second flip gas spring 7023 is hinged to the base 1. The connection between the first flip gas spring 7021 and the gas spring connector 7022 and the connection between the second flip gas spring 7023 and the gas spring connector 7022 are located at opposite ends of the gas spring connector 7022.

[0043] The leg support frame 401 includes a first connecting plate 4011 and a second connecting plate 4013 that are slidably connected. The leg support 4 is disposed on the first connecting plate 4011, and the second connecting plate 4013 is hinged to the seat cushion 2. A telescopic gas spring 703 for controlling the movement of the first connecting plate 4011 is provided between the first connecting plate 4011 and the second connecting plate 4013. Furthermore, the first connecting plate 4011 and the second connecting plate 4013 are arranged in parallel. The second connecting plate 4013 is hinged to the seat cushion frame 201 of the seat cushion 2. A linear slider 4012 is provided at the bottom of the first connecting plate 4011, and a linear slide rail 4014 that cooperates with the linear slider 4012 is provided on the upper side of the second connecting plate 4013. The telescopic gas spring 703 controls the first connecting plate 4011 to slide on the second connecting plate 4013, thereby realizing the extension of the leg support 4.

[0044] The first connecting plate 4011 is provided with a flip gas spring connecting plate 4015 and a leg support motor connecting plate 4016. The output end of the first flip gas spring 7021 is hinged to the flip gas spring connecting plate 4015, and the lead screw 7011 of the leg support motor 701 is hinged to the leg support motor connecting plate 4016.

[0045] In addition, buttons for controlling the operation of the drive mechanism 7 are also provided on the seat.

[0046] When a passenger needs to extend the leg rest 4 to support their legs, pressing a button activates the leg rest motor 701 to extend the lead screw 7011, applying a thrust to the lower end of the leg rest frame 401. Simultaneously, the upper end of the leg rest frame 401 compresses the flip-over gas spring 702, changing the angle of the leg rest 4. When the angle limit is reached, the leg rest motor 701 continues to control the lead screw 7011 to extend, thereby driving the first connecting plate 4011 to compress the telescopic gas spring 703. This causes the first connecting plate 4011 to extend along the linear slide rail 4014, lengthening the leg rest 4 and increasing its support performance. At this time, the flip-over gas spring 702 is in an energy storage state. When the leg rest motor 701 returns to its original position, the leg rest 4 retracts the first connecting plate 4011 under the elastic force of the telescopic gas spring 703, and then flips the leg rest inward under the action of the flip-over gas spring 702, effectively preventing the leg rest 4 from scraping against the floor.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention; therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0048] Although this article makes extensive use of the reference numerals in the figures: base 1, base slide 101, seat cushion 2, seat cushion frame 201, seat cushion slide 2011, first slider 2012, second slider 2013, connector 2014, backrest 3, backrest frame 301, slide bar 3011, roller 3012, leg rest 4, leg rest frame 401, first connecting plate 4011, linear slider 4012, second connecting plate 4013, linear slide rail 4014, flip gas spring connector The terms used include plate 4015, leg support motor connecting plate 4016, backrest adjustment mechanism 5, backrest gas spring 501, seat cushion adjustment mechanism 6, seat cushion motor 601, first slide rail 602, second slide rail 603, drive mechanism 7, leg support motor 701, lead screw 7011, flip gas spring 702, first flip gas spring 702, gas spring connector 7022, second flip gas spring 7023, telescopic gas spring 703, etc., but the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would be contrary to the spirit of the invention.

Claims

1. An electrically driven rail transit linkage seat, comprising a base (1) and a seat cushion (2) and a backrest (3) mounted on the base (1), the bottom of the seat cushion (2) is provided with a seat cushion framework (201), and the backrest (3) is provided with a backrest framework (301), characterized in that, The backrest adjusting mechanism (5) is arranged on the base (1) and can independently control the angle adjustment of the backrest (3). The base (1) is further provided with a seat cushion adjusting mechanism (6) cooperating with the backrest adjusting mechanism (5) to realize the synchronous adjustment of the seat cushion (2) and the backrest (3). The backrest adjusting mechanism (5) comprises a backrest gas spring (501) hinged to the backrest framework (301) and the seat cushion framework (201). The seat cushion adjusting mechanism (6) comprises a seat cushion motor (601) for adjusting the seat cushion (2). The base (1) is obliquely provided with a first sliding rail (602) and a second sliding rail (603) connected with the seat cushion framework (201). The seat cushion framework (201) slides along the first sliding rail (602) and the second sliding rail (603). The base (1) is formed with a base sliding groove (101) in an arc shape. The end of the backrest framework (301) is provided with a roller (3012) connected in the base sliding groove (101). The two ends of the backrest gas spring (501) are connected to the end of the seat cushion framework (201) and the end of the backrest framework (301) respectively. The roller (3012) and the backrest gas spring (501) are connected to the same end of the backrest framework (301). The seat cushion motor (601) is hinged to the base (1). The output end of the seat cushion motor (601) is hinged to the end of the seat cushion framework (201). The seat cushion motor (601) and the backrest gas spring (501) are connected to the same end of the seat cushion framework (201). The first sliding rail (602) and the second sliding rail (603) have the same oblique direction. The oblique angle of the first sliding rail (602) is smaller than that of the second sliding rail (603).

2. The electrically powered rail transit linked seat of claim 1, wherein, The seat cushion framework (201) is provided with a seat cushion sliding groove (2011). The backrest framework (301) is provided with a sliding bar (3011) slidingly connected in the seat cushion sliding groove (2011).

3. The electrically powered rail transit linked seat of claim 1, wherein, The two ends of the seat cushion framework (201) are respectively provided with a first sliding block (2012) and a second sliding block (2013). The first sliding block (2012) is slidingly connected to the first sliding rail (602). The second sliding block (2013) is slidingly connected to the second sliding rail (603).

4. The electrically powered rail transit linked seat of claim 1, wherein, The end of the seat cushion (2) is further provided with a leg support (4) for supporting the leg. The leg support (4) is provided with a leg support framework (401). The base (1) is provided with a driving mechanism (7) for controlling the leg support (4) to turn over and extend.

5. The motorized track-bound transit linked seat according to claim 4, characterized in that, The driving mechanism (7) comprises a leg support motor (701) and a turnover gas spring (702) connected with the leg support framework (401). The leg support motor (701) is hinged to the base (1). The output end of the leg support motor (701) is connected with a lead screw (7011). The end of the lead screw (7011) is hinged to the leg support framework (401). The two ends of the turnover gas spring (702) are respectively hinged to the leg support framework (401) and the base (1).

6. The motorized track-bound transit linked seat according to claim 4, characterized in that, The leg support framework (401) comprises a slidingly connected first connecting plate (4011) and a second connecting plate (4013), the leg support (4) is arranged on the first connecting plate (4011), the second connecting plate (4013) is hinged on the seat cushion (2), and a telescopic gas spring (703) for controlling movement of the first connecting plate (4011) is arranged between the first connecting plate (4011) and the second connecting plate (4013).

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