Zero-gravity posture linkage leg support structure

Abstract

The invention discloses a zero-gravity posture linkage leg support structure, and belongs to the technical field of seat leg supports.The zero-gravity posture linkage leg support structure comprises a seat cushion, a back cushion is arranged on one side of the top of the seat cushion, pushing plates are symmetrically and fixedly installed at the bottom of the back cushion, a first pushing groove is formed in the bottom of each pushing plate in a penetrating mode, and the seat cushion and the pushing plates are rotationally connected through rotating shafts; according to the device, the angle adjuster, the pushing sliding strip, the pushing frame, the pushing top frame and the second rotating top strip are arranged, the first mounting base forms pulling force on the second rotating top strip, the second rotating top strip is driven to rotate around a connecting pin shaft of the first rotating top strip, and then the first rotating top strip is pulled to rotate around the second mounting base; when the first rotating top strip and the second rotating top strip are pulled to gradually tend to be parallel, the foot supporting plate is pushed to extend out of the leg supporting plate, the angle between the back cushion and the seat cushion is adjusted, the angle between the leg supporting plate and the seat cushion is adjusted, and the length of the foot supporting plate extending out of the leg supporting plate is adjusted in a linkage mode, operation steps are simplified, and the adjustment process of the zero-gravity posture is more convenient.

Description

Technical Field

[0001] This invention belongs to the field of seat leg support technology, and in particular relates to a zero-gravity posture linkage leg support structure. Background Technology

[0002] In the seating manufacturing industry, especially in ergonomically designed products such as office chairs, gaming chairs, recliners, and vehicle seats, zero-gravity posture adjustment has become a core design feature for enhancing seating comfort. The leg rest, as a crucial component of the zero-gravity posture adjustment system, directly impacts the ergonomic experience through its coordination with the seat back and cushion. Currently, most zero-gravity leg rests on the market are independently adjustable, requiring multiple control switches to adjust the angles of the backrest and cushion, as well as the leg rest's angle and length. This cumbersome process prevents one-button posture adjustment, forcing users to repeatedly adjust the settings to find a comfortable zero-gravity sitting posture, thus reducing adjustment efficiency.

[0003] Existing zero-gravity posture-linked leg support structures are prone to problems such as trajectory deviation and jamming during the linkage power transmission between the backrest and leg support. They also lack precise limiting and reset structures, resulting in poor synchronization between leg support angle adjustment and length extension. They cannot achieve adaptive length adjustment according to the tilt angle of the backrest, and the leg support fit is insufficient. At the same time, under the pressure of the human body or slight external force, the linkage mechanism is prone to unexpected sliding, causing the angle of the backrest and leg support to deviate, making it impossible to maintain a stable zero-gravity sitting posture for a long time. In order to solve the above problems, there is an urgent need for a zero-gravity posture-linked leg support structure. Summary of the Invention

[0004] The purpose of this invention is to address the problems of trajectory deviation and jamming that easily occur during the linkage power transmission between the backrest and leg rest in existing zero-gravity posture linkage leg rest structures. Furthermore, the lack of precise limiting and resetting structures leads to poor synchronization between leg rest angle adjustment and length extension, an inability to adaptively adjust the length according to the backrest's tilt angle, insufficient leg support fit, and the tendency for the linkage mechanism to slip unexpectedly under human pressure or slight external force, causing angular deviation of the backrest and leg rest, thus failing to maintain a stable zero-gravity sitting posture for extended periods. Therefore, this invention proposes a zero-gravity posture linkage leg rest structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A zero-gravity posture-linked leg support structure includes: a seat cushion, a backrest cushion on one side of the top of the seat cushion, a push plate symmetrically fixedly installed on the bottom of the backrest cushion, and a push groove penetrating the bottom of the push plate, and the seat cushion and the push plate are rotatably connected by a pivot. Angle adjusters are respectively provided on both sides of the seat cushion at positions corresponding to the rotatable connection of the push plate. A telescopic footrest mechanism is rotatably installed on the side of the seat cushion away from the backrest cushion via a pivot. Mounting strips are symmetrically fixedly installed on both sides of the bottom of the seat cushion. A linkage push mechanism is fixedly installed at the center position between the two mounting strips on the bottom of the seat cushion. A support reset mechanism is provided on one side of the telescopic footrest mechanism. A locking mechanism is fixedly installed at the center position on the side of the bottom of the seat cushion away from the telescopic footrest mechanism.

[0007] As a further description of the above technical solution:

[0008] The telescopic footrest mechanism includes a leg support plate, which is rotatably connected to the side of the seat cushion away from the backrest via a pivot. A pusher bracket is symmetrically fixedly installed on the side of the leg support plate near the seat cushion. A pusher groove is provided through the end of the pusher bracket away from the leg support plate. Multiple rectangular sliding grooves are provided at equal intervals at the bottom of the leg support plate. A limiting protrusion is fixedly installed inside the rectangular sliding groove near the opening. A limiting slide bar is slidably installed inside the rectangular sliding groove and is slidably connected to the surface of the limiting protrusion. A footrest plate is fixedly connected to the bottom end of the multiple limiting slide bars. Mounting bases are symmetrically fixedly installed at both ends of the footrest plate near the seat cushion.

[0009] As a further description of the above technical solution:

[0010] The support and reset mechanism includes four mounting side plates, with two mounting side plates forming a group. Each group of mounting side plates is fixedly connected to the bottom of the mounting fixing strip. Guide slide rods are symmetrically fixed between each group of mounting side plates. A movable slider is slidably connected through the surfaces of the two guide slide rods. An auxiliary reset spring is sleeved on the surface of the guide slide rod located on the side of the movable slider. A support top plate is rotatably mounted on the bottom of the movable slider via a pin. A connecting rod is movably mounted between the ends of the two support top plates away from the movable slider. Rotating top bars are fixedly connected to both ends of the connecting rod through the support top plates. A mounting seat is rotatably mounted on the top of the rotating top bar via a pin. The mounting seat is fixedly connected to the bottom of the cushion. Rotating top bar 1 is rotatably connected to rotating top bar 2 via a pin. Rotating top bar 2 is rotatably connected to mounting seat 1 via a pin.

[0011] As a further description of the above technical solution:

[0012] The linkage pushing mechanism includes two fixed slides, which are fixedly connected to the bottom of the seat cushion between two mounting strips. A pushing slide is slidably connected through the bottom of the fixed slide. A pushing frame is fixedly connected to both ends of the pushing slide. The pushing frame at one end of the pushing slide is slidably connected through the pushing top frame. A locking link is fixedly connected between the pushing frames at the ends of the two pushing slides away from the telescopic footrest mechanism. The pushing frames at both ends of the locking link are slidably connected through the pushing groove at the bottom of the pushing plate.

[0013] As a further description of the above technical solution:

[0014] The pusher slide bar has a limiting slide groove on each side. An installation slide rod is fixedly installed inside the pusher slide bar, and a reset top block is slidably connected to the surface of the installation slide rod. The protrusions at both ends of the reset top block are slidably connected to the inside of the limiting slide groove. The protrusions at both ends of the reset top block are fixedly connected to one end of the inner wall of the fixed slide frame through the limiting slide groove. An auxiliary reset spring is sleeved on the surface of the installation slide rod on one side of the reset top block. The fixed slide frame has a limiting slide groove on each side. T-shaped locking blocks are fixedly installed at one end of the limiting slide groove on each side of the pusher slide bar, and the T-shaped locking blocks are slidably connected to the inside of the limiting slide groove.

[0015] As a further description of the above technical solution:

[0016] The locking mechanism includes a fixed base, with guide grooves extending through the bottom of both sides of the fixed base, and a locking connecting rod slidably connected inside the guide grooves. An installation groove extends through the center of the fixed base, and fixed baffles are symmetrically fixedly installed at the center of the inner wall of the installation groove. A second installation rod is fixedly installed between one side of the fixed baffle and the inner wall of the installation groove. A movable push plate is slidably installed through the surfaces of the two second installation rods. An auxiliary return spring is sleeved on the surface of the second installation rod located on the side of the movable push plate away from the fixed baffle. An electric telescopic rod is fixedly installed inside the installation groove on the side of the fixed baffle away from the movable push plate, and the telescopic end of the electric telescopic rod passes between the two fixed baffles and is fixedly connected to one side of the movable push plate.

[0017] As a further description of the above technical solution:

[0018] The bottom of the movable push plate is fixedly connected to a movable push bar. The fixed base has lifting grooves running through both sides of the mounting groove. The two ends of the movable push bar extend through the mounting groove into the lifting groove. The bottom of both sides of the inner wall of the lifting groove is provided with limiting slide grooves three. The protrusions at both ends of the movable push bar are slidably connected to the inside of the limiting slide grooves three. The fixed base has rectangular grooves symmetrically arranged on both sides. Each rectangular groove is fixedly installed with a mounting slide rod three. The surface of the mounting slide rod three is slidably connected to a movable slide plate. A lifting spring is sleeved on the surface of the mounting slide rod three at the bottom of the movable slide plate. The two movable slide plates on the same side are fixedly connected to lifting slide plates, and the lifting slide plates slide close to both sides of the fixed base.

[0019] As a further description of the above technical solution:

[0020] Fixed protrusions are fixedly installed on both sides of the fixed base at the center position between the two rectangular slots. A fixed slide groove is provided through the center position of the lifting slide plate, and the fixed slide groove is slidably connected to the surface of the fixed protrusion. A locking bracket is fixedly connected to the bottom between the two lifting slide plates. Lifting push plates are symmetrically fixedly connected to the top two sides of the locking bracket, and the lifting push plates are slidably connected to the lifting grooves. A lifting push groove is provided through the surface of the lifting push plate, and the protrusions at both ends of the moving push bar are slidably connected to the inside of the lifting push groove. The lifting push groove consists of two horizontal grooves and one inclined groove, and the two horizontal grooves are respectively connected to the two ends of the inclined groove.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. In this invention, by setting an angle adjuster, pusher slides, pusher frame, pusher top frame, and rotating top bar II, when the backrest is adjusted by the angle adjuster to rotate away from the seat cushion, the pusher plate at the bottom of the backrest rotates synchronously around the pivot. The pusher groove at the bottom of the pusher plate forms a horizontal thrust on the pusher frame that is slidably connected to it, causing the two pusher slides to slide synchronously horizontally along the fixed slide. When the pusher slides towards the telescopic footrest mechanism, the pusher frame at its end slides synchronously inside the pusher groove II of the pusher top frame, and forms an upward push force on the pusher top frame, causing the leg rest plate to rotate upward around the pivot connecting it to the seat cushion. This allows for synchronized adjustment of the angle between the leg rest and the seat cushion. As the leg rest rotates upward, the mounting base on its bottom footrest moves accordingly. The mounting base pulls on the rotating top bar, causing the rotating top bar to rotate around the connecting pin to the rotating top bar. This, in turn, pulls the rotating top bar to rotate around the mounting base. As the rotating top bar and the rotating top bar gradually become parallel, the footrest extends out of the leg rest, enabling coordinated adjustment of the angle between the backrest and the seat cushion, the angle between the leg rest and the seat cushion, and the length of the footrest extending out of the leg rest. This simplifies the operation and makes the zero-gravity posture adjustment process more convenient.

[0023] 2. In this invention, by setting up an electric telescopic rod, a locking linkage, a movable push plate, a movable push bar, a locking seat, and a lifting push plate, when it is necessary to adjust the tilt angle between the backrest and the seat cushion, the electric telescopic rod inside the mounting groove of the locking mechanism is activated. Its telescopic end extends outward and forms a horizontal thrust on the movable push plate, pushing the movable push plate to slide along the mounting slide rod two towards the fixed baffle. During this process, the auxiliary return spring three on the surface of the mounting slide rod two is compressed and deformed, and the movable push bar fixed at the bottom of the movable push plate slides horizontally synchronously with it. The protrusions at both ends slide along the slide groove trajectory in the lifting push groove, forming a vertical force on the lifting push plate. The downward thrust drives the lifting push plate to move vertically downward along the lifting groove, causing the locking link to slide along the guide groove until the tilt angle of the backrest and seat is adjusted to the correct position. Then, the electric telescopic rod retracts and, under the rebound action of the auxiliary reset spring three, lifts the moving push bar. At the same time, under the rebound action of the lifting spring, the locking bracket moves upward and locks onto the surface of the locking link, preventing the locking plate from sliding freely inside the guide groove. This completely restricts the linkage between the telescopic footrest mechanism and the support reset mechanism, avoiding the angle deviation of the backrest and leg rest due to unexpected sliding of each mechanism, and ensuring a stable and secure tilt posture in zero-gravity sitting position. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a zero-gravity posture linkage leg support structure proposed in this invention;

[0025] Figure 2 This is a schematic diagram of the unfolded zero-gravity posture linkage leg support structure proposed in this invention;

[0026] Figure 3 This is a schematic diagram of the cushion and push plate of a zero-gravity posture linkage leg support structure proposed in this invention;

[0027] Figure 4 This is a structural schematic diagram of the telescopic footrest mechanism and the support and reset mechanism of a zero-gravity posture linkage leg support structure proposed in this invention.

[0028] Figure 5 This is a cross-sectional schematic diagram of the leg support plate and the rotating top bar II of a zero-gravity attitude linkage leg support structure proposed in this invention.

[0029] Figure 6 This is a cross-sectional schematic diagram of the fixed slide and the pusher slide of a zero-gravity attitude linkage leg support structure proposed in this invention;

[0030] Figure 7 This is a cross-sectional view of the fixing seat and locking seat of a zero-gravity attitude linkage leg support structure proposed in this invention.

[0031] Figure 8 This is a cross-sectional schematic diagram of the electric telescopic rod and the movable push bar of the zero-gravity attitude linkage leg support structure proposed in this invention.

[0032] Figure 9 This is a schematic diagram of the locking seat and lifting push plate of a zero-gravity posture linkage leg support structure proposed in this invention.

[0033] Legend:

[0034] 1. Seat cushion; 101. Mounting fixing strip; 2. Backrest cushion; 201. Push plate; 202. Push groove one; 3. Angle adjuster; 4. Telescopic footrest mechanism; 401. Leg support plate; 402. Push top frame; 403. Push groove two; 404. Rectangular slide; 405. Limiting protrusion; 406. Limiting slide bar; 407. Footrest plate; 408. Mounting base one; 5. Linkage pushing mechanism; 501. Fixed slide; 502. Push slide bar; 503. Limiting slide groove one; 504. Reset top block; 505. Mounting slide bar one; 506. Auxiliary reset spring one; 507. Limiting slide groove two; 508. T-shaped locking block; 509. Push frame; 510. Locking connecting rod; 6. Support reset mechanism; 601. Mounting side plate; 602. Guide slide bar; 603. Moving slide bar 604. Auxiliary return spring II; 605. Support top plate; 606. Connecting rod; 607. Mounting base II; 608. Rotating top bar I; 609. Rotating top bar II; 7. Locking mechanism; 701. Fixed seat; 702. Mounting groove; 703. Fixed baffle; 704. Mounting slide bar II; 705. Moving push plate; 706. Auxiliary return spring III; 707. Electric telescopic rod; 708. Moving push bar; 709. Lifting groove; 710. Limiting slide groove III; 711. Guide slide groove; 712. Rectangular groove; 713. Mounting slide bar III; 714. Moving slide plate; 715. Lifting spring; 716. Lifting slide plate; 717. Fixed protrusion; 718. Fixed slide groove; 719. Locking seat; 720. Lifting push plate; 721. Lifting push slide groove. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In its specific implementation, such as Figures 1-9 The present invention provides a technical solution:

[0037] A zero-gravity posture-linked leg support structure includes: a seat cushion 1; a backrest 2 is provided on one side of the top of the seat cushion 1; push plates 201 are symmetrically fixedly installed on the bottom of the backrest 2, and a push groove 202 is provided through the bottom of the push plate 201; the seat cushion 1 and the push plate 201 are rotatably connected by a pivot; angle adjusters 3 are respectively provided on both sides of the seat cushion 1 at positions corresponding to the rotatable connection with the push plate 201; a telescopic footrest mechanism 4 is rotatably installed on the side of the seat cushion 1 away from the backrest 2 via a pivot; the telescopic footrest mechanism 4 includes a leg support plate 401, and the leg... The leg support plate 401 is rotatably connected to the side of the seat cushion 1 away from the backrest 2 via a pivot. A pusher bracket 402 is symmetrically fixedly installed on the side of the leg support plate 401 closest to the seat cushion 1. A pusher groove 403 is provided through the end of the pusher bracket 402 away from the leg support plate 401. Multiple rectangular sliding grooves 404 are equidistantly provided at the bottom of the leg support plate 401. A limiting protrusion 405 is fixedly installed inside the rectangular sliding groove 404 near the opening. A limiting slide bar 406 is slidably installed inside the rectangular sliding groove 404, and the limiting slide bar 406 extends through... The footrest plate 407 is slidably connected to the surface of the limiting protrusion 405. Multiple limiting slide bars 406 are fixedly connected to their bottom ends. Mounting seats 408 are symmetrically mounted on both ends of the footrest plate 407 near the seat cushion 1. When the leg support plate 401 rotates upwards around the connecting pivot to the seat cushion 1, the footrest plate 407 at its bottom moves accordingly. The mounting seats 408 on the footrest plate 407 exert a pulling force on the rotating top bar 609, causing the rotating top bar 609 to rotate around the connecting pin to the rotating top bar 608, thereby pulling the rotating top bar 609... The top bar 608 rotates around the mounting base 607 fixed to the bottom of the seat cushion 1. As the top bar 608 rotates, it gradually becomes parallel to the rotating top bar 609. The thrust generated by the two is transmitted to the footrest 407, which pushes the limiting slide 406 at the top of the footrest 407 to slide along the rectangular slide groove 404 of the leg support 401. The limiting slide 406 is precisely guided by the limiting protrusion 405 in the rectangular slide groove 404, so that the footrest 407 can be smoothly extended from the bottom of the leg support 401, completing the adaptive extension of the leg support length.

[0038] A mounting strip 101 is symmetrically fixed on both sides of the bottom of the seat cushion 1. A linkage pushing mechanism 5 is fixedly installed at the center position between the two mounting strips 101 at the bottom of the seat cushion 1. The linkage pushing mechanism 5 includes two fixed slides 501. The two fixed slides 501 are fixedly connected to the bottom of the seat cushion 1 between the two mounting strips 101. A pushing slide 502 is slidably connected through the bottom of the fixed slide 501. Pushing frames 509 are fixedly connected to both ends of the pushing slide 502. The pushing frame 509 at one end of the pushing slide 502 is slidably connected through the pushing top frame 402. A locking link 510 is fixedly connected between the pushing frames 509 at the ends of the two pushing slides 502 away from the telescopic footrest mechanism 4. The pusher brackets 509 at both ends of the cushion 201 are slidably connected to the pusher groove 202 at the bottom of the pusher plate 201. When the cushion 2 is rotated around the pivot connecting it to the seat cushion 1, the pusher plate 201, which is symmetrically fixed at the bottom of the cushion 2, rotates synchronously and coaxially with the cushion 2. The pusher groove 202 at the bottom of the pusher plate 201 generates a horizontal push force on the pusher bracket 509 that passes through it. This push force is transmitted to the two pusher slides 502, causing the pusher slides 502 to slide along the fixed slide 501 at the bottom of the seat cushion 1 toward the telescopic footrest mechanism 4. The pusher brackets 509 at their ends are simultaneously inserted into the pusher top frame 402 of the leg support plate 401 and slide along the second pusher groove 403, forming an upward push force on the pusher top frame 402, causing the leg support plate 401 to rotate and tilt upward on one side of the seat cushion 1 synchronously with the tilt of the cushion 2.

[0039] The push slide bar 502 has limiting grooves 503 extending through both sides. An mounting rod 505 is fixedly installed inside the push slide bar 502, and a reset top block 504 is slidably connected to the surface of the mounting rod 505. The protrusions at both ends of the reset top block 504 are slidably connected to the inside of the limiting grooves 503, and the protrusions at both ends of the reset top block 504 are fixedly connected to one end of the inner wall of the fixed slide frame 501 through the limiting grooves 503. An auxiliary reset spring 506 is sleeved on the surface of the mounting rod 505 located on one side of the reset top block 504. Limiting grooves 507 extend through both sides of the fixed slide frame 501. T-shaped supports are fixedly installed at one end of each limiting groove 503 on both sides of the push slide bar 502. The T-shaped locking block 508 is slidably connected inside the limiting slide groove 2 507. The T-shaped locking blocks 508 on both sides of the pusher slide 502 slide along the limiting slide groove 2 507 of the fixed slide frame 501. The reset top block 504 inside the pusher slide 502 slides along the limiting slide groove 1 503 on the surface of the mounting slide rod 1 505 to ensure that the sliding trajectory of the pusher slide 502 does not deviate. At the same time, the auxiliary reset spring 1 506 on the surface of the mounting slide rod 1 505 inside the pusher slide 502 is compressed by the reset top block 504 to form a reset elasticity reserve. When the cushion 2 rotates to reset, the auxiliary reset spring 1 506 applies elastic force to the reset top block 504, and the auxiliary reset top block 504 resets on the surface of the mounting slide rod 1 505.

[0040] A support and reset mechanism 6 is provided on one side of the telescopic footrest mechanism 4. The support and reset mechanism 6 includes four mounting side plates 601, with two mounting side plates 601 forming a group. Each group of mounting side plates 601 is fixedly connected to the bottom of the mounting fixing strip 101. Guide slide rods 602 are symmetrically fixed between each group of mounting side plates 601. A movable slider 603 is slidably connected through the surfaces of the two guide slide rods 602. An auxiliary reset spring 604 is sleeved on the surface of the guide slide rod 602 on the side of the movable slider 603. A support plate 605 is rotatably mounted on the bottom of the movable slider 603 via a pin. A connecting rod 606 is movably mounted between the ends of the two support plates 605 away from the movable slider 603. Both ends of the connecting rod 606 pass through the support plates 605 and are respectively fixedly connected to a rotating top bar 608. A mounting base 607 is rotatably mounted on the top of the rotating top bar 608 via a pin. The mounting base 607 is fixedly connected to the bottom of the cushion 1. A rotating top bar 609 is rotatably connected to the end of the rotating top bar 608 away from the mounting base 607 via a pin. One end of the second strip 609, away from the first rotating top strip 608, is rotatably connected to the first mounting base 408 via a pin. During the linkage process of the foot support plate 407 extending out from the bottom of the leg support plate 401, the rotation of the first rotating top strip 608 is transmitted to the supporting top plate 605 through the connecting rod 606, causing the supporting top plate 605 to rotate around the connecting pin to the movable slider 603, and forming a horizontal thrust on the movable slider 603. This pushes the movable slider 603 to slide along the guide slide rod 602 of the support reset mechanism 6, compressing the auxiliary reset spring 6 on the surface of the guide slide rod 602. 04 Deformation, while the side plate 601 fixes the guide slide rod 602, ensuring the stability of the sliding of the movable slider 603. The support reset mechanism 6 provides linkage power for the extension and retraction of the footrest 407. When the leg rest 401 is reset with the rotation of the backrest 2, the auxiliary reset spring 2 604 rebounds and lifts the movable slider 603, causing the support top plate 605 to pull the connecting rod 606 to rotate the connection position of the rotating top bar 1 608 and the rotating top bar 2 609, pulling the footrest 407 to stick tightly to the bottom of the leg rest 401 and vertically stick to one side of the seat cushion 1.

[0041] A locking mechanism 7 is fixedly installed at the center of the bottom of the seat cushion 1, away from the telescopic footrest mechanism 4. The locking mechanism 7 includes a fixed base 701, with guide grooves 711 extending through the bottom of both sides of the fixed base 701, and a locking connecting rod 510 slidingly connected inside the guide grooves 711. An installation groove 702 extends through the center of the interior of the fixed base 701, and fixed baffles 703 are symmetrically fixedly installed at the center of the inner wall of the installation groove 702. An installation slide rod 704 is fixedly installed between one side of the fixed baffle 703 and the inner wall of the installation groove 702. A movable push plate 705 is slidably installed through the surfaces of the two installation slide rods 704. An auxiliary return spring 706 is sleeved on the surface of the installation slide rod 704 on the side of the movable push plate 705 away from the fixed baffle 703. The installation groove 702 is located on the side of the fixed baffle 703 away from the movable push plate 705. An electric telescopic rod 707 is fixedly installed, and the telescopic end of the electric telescopic rod 707 passes between two fixed baffles 703 and is fixedly connected to one side of the movable push plate 705. When the locking mechanism 7 is activated, the telescopic end of the electric telescopic rod 707 extends outward and forms a horizontal thrust on the movable push plate 705 in the mounting groove 702, pushing the movable push plate 705 to slide along the second mounting slide rod 704 towards the fixed baffle 703. The auxiliary return spring 706 on the surface of the second mounting slide rod 704 is compressed and deformed as the movable push plate 705 slides. When the electric telescopic rod 707 retracts and drives the movable push plate 705 to slide on the surface of the second mounting slide rod 704, the auxiliary return spring 706 rebounds to prevent the movable push plate 705 from tilting or deflecting while sliding along the surface of the second mounting slide rod 704.

[0042] A movable pusher 708 is fixedly connected to the bottom of the movable push plate 705. Lifting grooves 709 are respectively provided through both sides of the mounting groove 702 inside the fixed base 701. The movable pusher 708 extends through the mounting groove 702 to the inside of the lifting groove 709 at both ends. Limiting slide grooves 710 are respectively provided at the bottom of the inner walls of the lifting grooves 709. The protrusions at both ends of the movable pusher 708 are respectively slidably connected to the inside of the limiting slide grooves 710. A locking seat 719 is fixedly connected to the bottom between the two lifting slide plates 716. Lifting push plates 720 are symmetrically fixedly connected to both sides of the top of the locking seat 719. The lifting push plates 720 are slidably connected to the lifting grooves 709. A lifting push groove 721 is provided through the surface of the lifting push plate 720. The protrusions at both ends of the movable pusher 708 are slidably connected to the inside of the lifting push groove 721. The lifting push groove 721 consists of two horizontal sliding sections. The system consists of a groove and an inclined slide. The horizontal slides at both ends are connected to the two ends of the inclined slide. While the moving push plate 705 slides, the moving push bar 708 fixed at the bottom of the moving push plate 705 moves horizontally in sync with it. The protrusions at both ends of the moving push bar 708 slide along the limiting slide bar 710 on the inner wall of the lifting groove 709 to ensure that the moving push bar 708 will not tilt or deflect during the movement. The protrusions at both ends of the moving push bar 708 are embedded in the lifting push slide bar 721 of the lifting push plate 720 and slide along the slide bar trajectory, driving the lifting push plate 720 to move vertically downward along the lifting groove 709, thereby pushing the locking seat 719 downward in sync, so that the locking seat 719 separates from the locking link 510, releasing the locking restriction on the locking link 510. At this time, the locking link 510 can slide freely along the guide slide bar 711 of the fixed seat 701, providing conditions for the angle adjustment of the backrest 2 and the seat cushion 1.

[0043] The fixed base 701 has rectangular slots 712 symmetrically arranged on both sides. Each rectangular slot 712 has a mounting slide rod 713 fixedly installed inside. The surface of the mounting slide rod 713 is slidably connected to a movable slide plate 714. A lifting spring 715 is sleeved on the surface of the mounting slide rod 713 at the bottom of the movable slide plate 714. The two movable slide plates 714 on the same side are fixedly connected to a lifting slide plate 716, and the lifting slide plate 716 slides close to both sides of the fixed base 701. Fixed protrusions 717 are fixedly installed on both sides of the fixed base 701 at the center position between the two rectangular slots 712. A fixed slide groove 718 is provided through the center position of the lifting slide plate 716, and the fixed slide groove 718 is slidably connected to the surface of the fixed protrusions 717. Mounting slide rods 713 are fixedly installed in the rectangular slots 712 on both sides of the fixed base 701 to provide vertical sliding guidance for the moving slide plate 714. The moving slide plate 714 is fixedly connected to the lifting slide plate 716, so that the lifting slide plate 716 can move vertically up and down along the mounting slide rods 713 with the moving slide plate 714. The lifting spring 715 is located at the bottom of the movable slide plate 714, providing elastic support for the upward reset of the lifting slide plate 716. The fixing protrusions 717 on both sides of the fixed seat 701 pass through the fixing grooves 718 of the lifting slide plate 716, forming a secondary guide limit, ensuring that the lifting slide plate 716 always sticks to the side wall of the fixed seat 701 during the vertical lifting process without any left or right deviation. The lifting slide plate 716 is fixedly connected to the locking bracket 719. The double guide structure ensures the accuracy of the lifting trajectory of the locking bracket 719, so that the locking bracket 719 can accurately engage or disengage with the locking linkage 510, improving the operational stability of the locking mechanism 7.

[0044] Working principle:

[0045] When adjusting the seat to a zero-gravity posture, first activate the electric telescopic rod 707 in the bottom locking mechanism 7 of the seat cushion 1. Its telescopic end extends outward and applies a horizontal pushing force to the movable push plate 705 within the mounting groove 702, pushing the movable push plate 705 to slide along the mounting slide rod 704 away from the fixed baffle 703. During this process, the auxiliary return spring 706 on the surface of the mounting slide rod 704 is compressed and deformed, forming a reserve of return spring force to prevent the movable push plate 705 from tilting or deflecting during subsequent rebound. Simultaneously, the movable push plate 705 drives the bottom movable push bar 708 to slide horizontally. The protrusions at both ends of the movable push bar 708 slide precisely along the limiting slide groove 710 on the inner wall of the lifting groove 709. The protrusion is embedded in the lifting push groove 721 on the surface of the lifting push plate 720 and slides along the trajectory of "horizontal groove + inclined groove". The horizontal thrust is converted into a vertical downward thrust on the lifting push plate 720 by the guiding effect of the inclined groove, which drives the lifting push plate 720 to move downward along the lifting groove 709. This pulls the locking seat 719 downward at the same time until the locking seat 719 moves down smoothly and completely separates from the locking link 510, releasing the locking limit on the locking link 510. At this time, the locking link 510 can slide freely along the guide groove 711 of the fixed seat 701, providing conditions for the subsequent movement of the linkage push mechanism 5 and the telescopic foot support mechanism 4, and completing the unlocking preparation for posture adjustment.

[0046] After unlocking, adjust the angle adjusters 3 on both sides of the seat cushion 1 to drive the backrest 2 to rotate away from the seat cushion 1 around its connection axis. The push plate 201, which is symmetrically fixed at the bottom of the backrest 2, rotates synchronously and coaxially with it. The push groove 202 at the bottom of the push plate 201 applies a horizontal pushing force to the push frame 509 passing through the groove towards the telescopic footrest mechanism 4, so that the pushing force is synchronously transmitted to the two push slides 502, driving the push slides 502 to slide along the fixed slide frame 501 at the bottom of the seat cushion 1 towards the telescopic footrest mechanism 4. The reset top block 504 inside the push slide 502 slides along the limiting slide groove 503 on the surface of the mounting slide rod 505 to ensure that the horizontal sliding is without deviation or jamming. The push frame 509 at the end of the push slide 502 is inserted into the push top frame 402 of the leg support plate 401, slides along the push groove 403 and applies a pushing force to the push top frame 402, driving the leg support plate 401 to rotate. The leg support plate 401 rotates upward around the connecting pivot of its connection with the seat cushion 1, so that the angle of the leg support plate 401 and the backrest 2 can be adjusted synchronously, so that the leg support angle and the backrest angle are matched. When the leg support plate 401 rotates upward, the foot support plate 407 at its bottom moves together. The mounting seat 408 on the foot support plate 407 applies a pulling force to the rotating top bar 609, causing the rotating top bar 609 to rotate around the connecting pin of the rotating top bar 608, and then pulling the rotating top bar 608 to rotate around the mounting seat 607 at the bottom of the seat cushion 1. As the rotating top bar 608 and the rotating top bar 609 gradually become parallel, the horizontal thrust formed by the two is transmitted to the foot support plate 407, pushing the limiting slide bar 406 at the top of the foot support plate 407 to slide along the rectangular slide groove 404 of the leg support plate 401 until the foot support plate 407 extends smoothly from the bottom of the leg support plate 401, completing the adaptive extension of the leg support length.

[0047] When the positions of the backrest 2, leg rest 401, and footrest 407 are all adjusted to the suitable angle for a zero-gravity sitting posture, the telescopic end of the electric telescopic rod 707 of the locking mechanism 7 retracts, releasing the horizontal pushing force on the movable push plate 705. At this time, the compressed auxiliary return spring 706 releases its return force, pushing the movable push plate 705 to slide in the opposite direction along the mounting slide rod 704 to its initial position. The movable push bar 708 slides horizontally in the opposite direction synchronously, and the protrusions at both ends slide in the opposite direction along the lifting push groove 721, releasing the downward pushing force on the lifting push plate 720. At the same time, the compressed lifting spring 715 at the bottom of the mounting slide rod 713 releases its return force, pushing the movable slide plate 714 to slide vertically upward along the mounting slide rod 713. The movable lifting slide plate 716 slides upward along the fixed slide groove 718 of the fixed protrusion 717. Simultaneously, the lifting slide plate 716 pulls the locking seat 719 vertically upward until the locking seat 719 is tightly engaged with the outer surface of the locking link 510, thereby fixing and limiting the locking link 510. After the locking link 510 is locked, the push frame 509 and the push slide 502 can no longer slide in the horizontal direction, thus completely restricting the movement of all linkage components of the linkage push mechanism 5, the telescopic footrest mechanism 4, and the support reset mechanism 6. This prevents the mechanisms from sliding unexpectedly due to human body pressure, external forces, etc., and prevents the angle of the backrest 2 and the leg support plate 401 from shifting, ensuring that the tilt posture of the zero-gravity sitting posture is stable and without loosening, and realizing the locking and fixing of the device.

Claims

1. A zero-gravity posture-linked leg support structure, characterized in that, include: A seat cushion (1) is provided with a backrest (2) on one side of the top of the seat cushion (1). A push plate (201) is symmetrically fixedly installed on the bottom of the backrest (2). A push groove (202) is provided through the bottom of the push plate (201). The seat cushion (1) and the push plate (201) are rotatably connected by a rotating shaft. An angle adjuster (3) is provided on both sides of the seat cushion (1) at the positions corresponding to the rotatable connection of the push plate (201). A telescopic footrest mechanism (4) is rotatably installed on the side of the seat cushion (1) away from the backrest (2). A mounting strip (101) is symmetrically fixedly installed on both sides of the bottom of the seat cushion (1). A linkage push mechanism (5) is fixedly installed at the center position between the two mounting strips (101) at the bottom of the seat cushion (1). A support reset mechanism (6) is provided on one side of the telescopic footrest mechanism (4). A locking mechanism (7) is fixedly installed at the center position on the side of the bottom of the seat cushion (1) away from the telescopic footrest mechanism (4).

2. The zero-gravity posture linkage leg support structure according to claim 1, characterized in that, The telescopic footrest mechanism (4) includes a leg support plate (401), and the leg support plate (401) is rotatably connected to the side of the seat cushion (1) away from the backrest (2) via a pivot. A pusher bracket (402) is symmetrically fixedly installed on the side of the leg support plate (401) near the seat cushion (1). A pusher groove (403) is provided through the end of the pusher bracket (402) away from the leg support plate (401). A plurality of rectangular sliding grooves (404) are provided through the bottom of the leg support plate (401) at equal intervals. A limiting protrusion (405) is fixedly installed inside the rectangular slide groove (404) near the opening. A limiting slide strip (406) is slidably installed inside the rectangular slide groove (404), and the limiting slide strip (406) is slidably connected to the surface of the limiting protrusion (405). A footrest plate (407) is fixedly connected to the bottom end of a plurality of limiting slide strips (406). A mounting base (408) is symmetrically fixedly installed at both ends of the footrest plate (407) near the side of the seat cushion (1).

3. The zero-gravity posture linkage leg support structure according to claim 2, characterized in that, The support and reset mechanism (6) includes mounting side plates (601), and the number of mounting side plates (601) is four. Two mounting side plates (601) form a group. Each group of mounting side plates (601) is relatively fixedly connected to the bottom of the mounting fixing strip (101). Guide slide rods (602) are symmetrically fixed between each group of mounting side plates (601). A movable slider (603) is slidably connected through the surfaces of the two guide slide rods (602). An auxiliary reset spring (604) is sleeved on the surface of the guide slide rod (602) on one side of the movable slider (603). A support top plate (605) is rotatably mounted on the bottom of the movable slider (603) through a pin. A connecting rod (606) is movably installed between the end of the supporting top plate (605) away from the movable slider (603). The two ends of the connecting rod (606) pass through the supporting top plate (605) and are respectively fixedly connected to a rotating top bar (608). The top end of the rotating top bar (608) is rotatably mounted with a mounting seat (607) through a pin. The mounting seat (607) is fixedly connected to the bottom of the cushion (1). The end of the rotating top bar (608) away from the mounting seat (607) is rotatably connected to a rotating top bar (609) through a pin. The end of the rotating top bar (609) away from the rotating top bar (608) is rotatably connected to the mounting seat (408) through a pin.

4. The zero-gravity posture linkage leg support structure according to claim 2, characterized in that, The linkage pushing mechanism (5) includes a fixed slide (501), and there are two fixed slides (501). The two fixed slides (501) are fixedly connected to the bottom of the seat cushion (1) between two mounting fixing strips (101). The bottom of the fixed slide (501) is slidably connected to a pushing slide (502). The two ends of the pushing slide (502) are respectively fixedly connected to a pushing frame (509). The pushing frame (509) at one end of the pushing slide (502) is slidably connected to the pushing top frame (402). The pushing frame (509) at the end of the two pushing slides (502) away from the telescopic footrest mechanism (4) is fixedly connected to a locking link (510). The pushing frames (509) at both ends of the locking link (510) are slidably connected to the pushing groove (202) at the bottom of the push plate (201).

5. The zero-gravity posture linkage leg support structure according to claim 4, characterized in that, The pusher slide bar (502) is provided with limiting slide grooves (503) on both sides. The pusher slide bar (502) is fixedly installed with a mounting slide rod (505). A reset top block (504) is slidably connected to the surface of the mounting slide rod (505). The protrusions at both ends of the reset top block (504) are slidably connected to the inside of the limiting slide groove (503). The protrusions at both ends of the reset top block (504) pass through the limiting slide groove (503) and are connected to the fixed slide frame (501). One end of the inner wall is fixedly connected, and an auxiliary reset spring (506) is sleeved on the surface of the mounting slide rod (505) located on one side of the reset top block (504). The fixed slide (501) is provided with limiting slide grooves (507) on both sides respectively. T-shaped blocks (508) are fixedly installed on one end of the pushing slide bar (502) located on one side of the limiting slide groove (503) respectively, and the T-shaped blocks (508) are slidably connected inside the limiting slide groove (507).

6. The zero-gravity posture linkage leg support structure according to claim 5, characterized in that, The locking mechanism (7) includes a fixed base (701), with guide grooves (711) extending through the bottom of both sides of the fixed base (701), and a locking connecting rod (510) slidingly connected inside the guide grooves (711). A mounting groove (702) extends through the center of the fixed base (701), and fixed baffles (703) are symmetrically fixedly installed at the center of the inner wall of the mounting groove (702). A second mounting rod (704) is fixedly installed between one side of the fixed baffle (703) and the inner wall of the mounting groove (702). A movable push plate (705) is slidably mounted on the surface of the two mounting slide rods (704). An auxiliary reset spring (706) is sleeved on the surface of the mounting slide rod (704) on the side of the movable push plate (705) away from the fixed baffle (703). An electric telescopic rod (707) is fixedly mounted inside the mounting groove (702) on the side of the fixed baffle (703) away from the movable push plate (705). The telescopic end of the electric telescopic rod (707) passes between the two fixed baffles (703) and is fixedly connected to one side of the movable push plate (705).

7. The zero-gravity posture linkage leg support structure according to claim 6, characterized in that, The bottom of the movable push plate (705) is fixedly connected to a movable push bar (708). The fixed base (701) has lifting grooves (709) extending through both sides of the mounting groove (702). Both ends of the movable push bar (708) extend through the mounting groove (702) into the lifting groove (709). The bottom of both sides of the inner wall of the lifting groove (709) is provided with limiting slide grooves (710). The protrusions at both ends of the movable push bar (708) are slidably connected to the limiting slide grooves (710). The fixed base ( 701) Rectangular grooves (712) are symmetrically provided on both sides. Each rectangular groove (712) is fixedly installed with a mounting slide rod (713). A movable slide plate (714) is slidably connected through the surface of the mounting slide rod (713). A lifting spring (715) is sleeved on the surface of the mounting slide rod (713) at the bottom of the movable slide plate (714). Two movable slide plates (714) on the same side are fixedly connected with lifting slide plates (716). The lifting slide plates (716) slide close to both sides of the fixed seat (701).

8. The zero-gravity posture linkage leg support structure according to claim 7, characterized in that, Fixed protrusions (717) are fixedly installed on both sides of the fixed base (701) at the center position between the two rectangular grooves (712). A fixed slide groove (718) is provided through the center position of the lifting slide plate (716), and the fixed slide groove (718) is slidably connected to the surface of the fixed protrusion (717). A locking seat (719) is fixedly connected to the bottom between the two lifting slide plates (716). A lifting push plate (720) is symmetrically fixedly connected to both sides of the top of the locking seat (719), and the lifting push plate (720) is slidably connected to the lifting groove (709). A lifting push groove (721) is provided through the surface of the lifting push plate (720), and the protrusions at both ends of the moving push bar (708) are slidably connected to the inside of the lifting push groove (721). The lifting push groove (721) is composed of two horizontal grooves and one inclined groove, and the two horizontal grooves are respectively connected to the two ends of the inclined groove.

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