Seat device capable of segmentally adjusting angle of backrest

Abstract

The seat device comprises a support, a cushion frame swinging relative to the support, a linear driver and a main movement frame, the middle of the main movement frame is rotationally connected to the output end of the linear driver, and a first driving arm is rotationally connected between the rear side of the main movement frame and the support; the backrest assembly is rotationally arranged on the rear side of the cushion frame, and a second driving arm is rotationally connected between the backrest assembly and the first driving arm; the leg support assembly is rotationally connected to the front side of the seat cushion frame; the first swing guide mechanism is used for driving the main moving frame to swing relative to the cushion frame and is provided with a first extension section; the second swing guide mechanism is used for driving the leg support assembly to rotate and is provided with a second extension section. Only one linear driver is adopted, the leg support assembly can be driven to be completely opened at first, then the backrest assembly is continuously driven to conduct back-leaning angle adjustment, the backrest assembly can be controlled to restore the angle position, and the leg support assembly can be stored.

Description

Technical Field

[0001] This invention relates to a seat device with segmented adjustable backrest angle. Background Technology

[0002] As people's demands for seating comfort continue to increase, modern seats are typically equipped with adjustable components such as leg rests and backrests. In recent years, zero-gravity seats have become increasingly popular. These seats simulate a relaxed posture in a weightless state by unfolding the leg rest and reclining the backrest to a specific angle, thus significantly improving the user's comfort experience. In existing technologies, to achieve zero-gravity mode, seats generally have two independent actuators: the first actuator is used to drive the unfolding and retraction of the leg rest, and the second actuator is used to adjust the reclining angle of the backrest. While this dual-actuator solution can control the movements of the leg rest and backrest separately, it also brings significant drawbacks. First, the use of two actuators increases manufacturing costs. Second, each actuator requires independent installation space and a corresponding linkage mechanism, resulting in a complex internal structure and a large space occupation. Especially in scenarios where space under the seat is limited, this layout often severely restricts the design of other components (such as brackets, slide rails, or electronic components), affecting the optimization and compactness of the overall structure.

[0003] To simplify design and reduce costs, the industry has attempted to use a single actuator combined with a standard linkage structure to link the leg rest and backrest. However, in this approach, the leg rest and backrest are directly coupled, causing them to expand or retract synchronously at nearly the same angular velocity. Specifically, during operation, the leg rest cannot remain fixed in a fully expanded state, while the backrest adjusts independently; conversely, changes in the backrest angle also force the leg rest to move. This clearly cannot meet the functional requirements of a zero-gravity seat, as zero-gravity mode typically requires the leg rest to fully expand and lock first, followed by the backrest gradually reclining to the predetermined angle.

[0004] Therefore, existing technologies suffer from problems such as high cost, bulky structure, low space utilization, and limited adjustment modes. There is an urgent need for a seat device that can simplify the drive structure, save space and cost, and enable the leg rest to be positioned after unfolding and the backrest angle to be gradually adjusted. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a seat device for segmented adjustment of the backrest angle, which uses only a linear actuator to drive the leg support assembly to fully open first, and then continue to drive the backrest assembly to adjust the reclining angle. It can also control the backrest assembly to return to its original angle position and to retract the leg support assembly.

[0006] According to an embodiment of the present invention, a seat device for segmented adjustment of backrest angle includes: a bracket, wherein a seat cushion frame capable of swinging up and down relative to the bracket is rotatably connected to the bracket; a linear actuator, the main body of which is rotatably connected to the seat cushion frame; a main motion frame, the middle portion of which is rotatably connected to the output end of the linear actuator, and a first drive arm rotatably connected between the rear side of the main motion frame and the bracket; a backrest assembly, rotatably disposed on the rear side of the seat cushion frame, and a second drive arm rotatably connected between the backrest assembly and the first drive arm; a leg rest assembly, rotatably connected to the front side of the seat cushion frame; and a first swing guide mechanism, disposed between the main motion frame and the front side of the seat cushion frame, for driving the main motion frame to swing relative to the seat cushion frame, the first swing guide mechanism having a first storage position, a first transition position, and a first unfolded position. The first unfolded position has a first extension section; a second swing guide mechanism is disposed between the leg support assembly and the front side of the main motion frame, for driving the leg support assembly to rotate. The second swing guide mechanism has a second storage position, a second transition position, and a second unfolded position. The second unfolded position has a second extension section. During the process of the second swing guide mechanism switching from the second storage position to the second unfolded position, the first drive arm and the second drive arm form an obtuse angle, causing the backrest assembly to rotate slightly. When the first swing guide mechanism moves along the first extension section, the second swing guide mechanism moves along the second extension section, keeping the leg support assembly unfolded. At this time, the rear side of the main motion frame sequentially drives the first drive arm and the second drive arm to move, increasing the angle of the backrest assembly swinging backward.

[0007] A seat device for segmented backrest angle adjustment according to an embodiment of the present invention has at least the following beneficial effects: When switching to zero-gravity mode, the output of the linear actuator pushes the main motion frame forward. The first swing guide mechanism drives the main motion frame to swing downward relative to the seat cushion frame, thereby triggering the leg support assembly to unfold via the second swing guide mechanism. Then, the linear actuator continues to push the main motion frame forward. The first swing guide mechanism moves along the first extension section, and the second swing guide mechanism moves along the second extension section, keeping the leg support assembly unfolded. At this time, the main motion frame sequentially drives the first drive arm and the second drive arm to adjust the reclining angle of the backrest assembly. This seat device uses only one linear actuator, which can drive the leg support assembly to fully open first, and then continue to drive the backrest assembly to adjust the reclining angle. It can also control the backrest assembly to return to its original position and to retract the leg support assembly.

[0008] In some embodiments of the present invention, the first swing guide mechanism includes a first guide post fixedly disposed on the seat cushion frame and a first guide groove disposed on the main motion frame and through which the first guide post moves. The first guide groove includes a first oblique strip hole, a second oblique strip hole and a first straight strip hole connected in sequence. The first straight strip hole constitutes the first extension section. The length direction of the main motion frame extends approximately along the front-rear direction. The first oblique strip hole is inclined upward toward the rear side of the main motion frame. The second oblique strip hole is inclined downward toward the rear side of the main motion frame. The first straight strip hole is parallel to the length direction of the main motion frame. The first guide post slides backward along the first guide groove to make the front side of the main motion frame swing downward and then upward, thereby driving the leg support assembly to extend to the front of the seat cushion frame through the second swing guide mechanism.

[0009] In some embodiments of the present invention, the leg support assembly includes a first strip plate, a second strip plate, a third strip plate, a fourth strip plate, and a footrest plate. One end of the first strip plate is rotatably connected to the seat cushion frame, and the other end of the first strip plate is rotatably connected to one end of the second strip plate. One end of the third strip plate is rotatably connected to the seat cushion frame, and the other end of the third strip plate is rotatably connected to one end of the fourth strip plate. The other ends of the second strip plate and the fourth strip plate are respectively rotatably connected to the footrest plate. The first strip plate and the fourth strip plate... The first and fourth strip plates are rotatably connected at their intersections, forming a parallelogram mechanism between the first, second, and fourth strip plates and the footrest plate. The second swing guide mechanism includes a second guide post fixed to the main motion frame and a second guide groove on the first strip plate. The second guide post slides within the second guide groove to drive the first strip plate to rotate relative to the seat frame.

[0010] In some embodiments of the present invention, the second guide groove includes a first waist-shaped hole, a ramp elongated hole and a second waist-shaped hole sequentially connected along the length direction of the first strip plate, the second waist-shaped hole forming the second extension section, the first waist-shaped hole and the second waist-shaped hole being parallel to each other and extending along the length direction of the first strip plate, and when the second guide post moves from the first waist-shaped hole to the second waist-shaped hole, it drives the first strip plate to flip from below the seat frame to extend in front of the seat frame.

[0011] In some embodiments of the present invention, the seat frame includes a rectangular frame, the linear actuator includes a linear guide rail and a slider reciprocatingly sliding on the linear guide rail, one end of the linear guide rail is pivotally connected to the middle position of the width direction of the rear side of the rectangular frame, and the other end of the linear guide rail points to the middle position of the width direction of the front side of the rectangular frame, the main motion frame includes two parallel straight tubes and a mounting bracket connected between the adjacent ends of the two straight tubes, the mounting bracket is rotatably connected to the slider via a pivot orthogonal to the linear guide rail, and the leg support assembly includes two leg support units respectively movably connected to the front side of the two straight tubes, the two leg support units, the two straight tubes, and the mounting bracket are all arranged symmetrically about the linear guide rail axis.

[0012] In some embodiments of the present invention, a connecting arm is further included. The seat frame is rotatably connected to the support via a first pivot. The first drive arm is rotatably connected to the support via a second pivot. One end of the connecting arm is rotatably connected to the support via a third pivot. The other end of the connecting arm is rotatably connected to the seat frame via a fourth pivot. The support, the seat frame, the connecting arm, and the first drive arm form a planar four-bar linkage.

[0013] In some embodiments of the present invention, the first drive arm is provided with an angle positioning component, and the bracket is provided with an angle positioning groove with a U-shaped opening that cooperates with the angle positioning component. After the angle positioning component enters the angle positioning groove, the backrest assembly is stabilized at the angle position corresponding to the zero gravity mode.

[0014] In some embodiments of the present invention, after the angle positioning member enters the angle positioning groove, the first pivot, the third pivot and the second pivot are located on the same straight line. When the linear actuator drives the main motion frame to move backward, it drives the first drive arm to rotate around the second pivot, causing the angle positioning member to leave the angle positioning groove. When the backrest assembly has a tendency to swing forward relative to the seat frame, the second drive arm drives the angle positioning member to abut against the inner wall of the angle positioning groove.

[0015] In some embodiments of the present invention, the first drive arm, the second drive arm and the connecting arm are all sheet metal parts. The first drive arm, the second drive arm and the connecting arm are respectively arranged on both sides of the width direction of the seat frame. The angle positioning member is a positioning straight tube vertically connected between the two first drive arms. The bracket is provided with an angle positioning groove at both ends of the positioning straight tube.

[0016] In some embodiments of the present invention, the U-shaped opening of the angle positioning groove is arranged downward, the inner peripheral wall of the angle positioning groove is attached to the outer peripheral wall of the positioning straight tube, and the front edge of the angle positioning groove is provided with a chamfered portion to guide the positioning straight tube into or out of the angle positioning groove.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the leg support assembly in the storage configuration of an embodiment of the segmented adjustable backrest angle seat device of the present invention. Figure 2 for Figure 1 A schematic diagram of the leg support assembly during its unfolding process in the embodiment; Figure 3 for Figure 1 A schematic diagram of the leg support assembly in the embodiment when it is fully extended; Figure 4 for Figure 3 A schematic diagram of the backrest assembly in zero-gravity mode according to the embodiment; Figure 5 for Figure 2 A schematic diagram of the structure of the seat cushion frame, leg support assembly, first swing guide mechanism and second swing guide mechanism; Figure 6 This is a schematic diagram illustrating the angle change process of the first drive arm, the second drive arm, and the backrest assembly.

[0019] Figure label: 100 bracket; 101 angle positioning groove; 200 seat cushion frame; 201 first pivot; 300 linear actuator; 310 linear guide; 320 slider; 400 main motion frame; 410 straight tube; 420 mounting bracket; 500 backrest assembly; 600 leg support assembly; 610 first strip plate; 620 second strip plate; 630 third strip plate; 640 fourth strip plate; 650 footrest; 710 first swing guide mechanism; 7 first guide column. 11; First guide groove 712; First oblique bar hole 713; Second oblique bar hole 714; First straight bar hole 715; Second swing guide mechanism 720; Second guide post 721; Second guide groove 722; First waist-shaped hole 723; Sloping long hole 724; Second waist-shaped hole 725; First drive arm 810; Second pivot 811; Angle positioning component 812; Second drive arm 820; Connecting arm 830; Third pivot 831; Fourth pivot 832. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer", indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] See Figures 1 to 6An embodiment of the present invention provides a seat device for segmented adjustment of backrest angle, comprising: a bracket 100, wherein a seat cushion frame 200 capable of swinging up and down relative to the bracket 100 is rotatably connected to the bracket 100; a linear actuator 300, the main body of which is rotatably connected to the seat cushion frame 200; and a main motion frame 400, the middle part of which is rotatably connected to the output end of the linear actuator 300, and a first drive arm 810 rotatably connected between the rear side of the main motion frame 400 and the bracket 100. A backrest assembly 500 is rotatably disposed on the rear side of the seat cushion frame 200, and a second drive arm 820 is rotatably connected between the backrest assembly 500 and the first drive arm 810; a leg support assembly 600 is rotatably connected to the front side of the seat cushion frame 200; a first swing guide mechanism 710 is disposed between the main motion frame 400 and the front side of the seat cushion frame 200, for driving the main motion frame 400 to swing relative to the seat cushion frame 200, and the first swing guide mechanism 710 has a first storage position and a first... The backrest assembly 500 has a transition position and a first unfolded position, the first unfolded position having a first extension section; a second swing guide mechanism 720, disposed between the leg support assembly 600 and the front side of the main motion frame 400, for driving the leg support assembly 600 to rotate, the second swing guide mechanism 720 having a second storage position, a second transition position and a second unfolded position, the second unfolded position having a second extension section; wherein, during the process of the second swing guide mechanism 720 switching from the second storage position to the second unfolded position, the first drive arm 810 and the second drive arm 820 form an obtuse angle, causing the backrest assembly 500 to rotate slightly; when the first swing guide mechanism 710 moves along the first extension section, the second swing guide mechanism 720 moves along the second extension section, keeping the leg support assembly 600 unfolded, at this time the rear side of the main motion frame 400 sequentially drives the first drive arm 810 and the second drive arm 820 to move, thereby increasing the angle of the backrest assembly 500 swinging backward.

[0025] When switching to zero gravity mode, see Figure 1 and Figure 2 The output of the linear actuator 300 pushes the main motion frame 400 forward, and the first swing guide mechanism 710 drives the main motion frame 400 to swing downward relative to the seat cushion frame 200 so as to link the leg support assembly 600 to unfold via the second swing guide mechanism 720. See [link / reference] Figure 3 Then, the linear drive 300 continues to push the main motion frame 400 forward, the first swing guide mechanism 710 moves along the first extension, and the second swing guide mechanism 720 moves along the second extension, thereby keeping the leg support assembly 600 extended. See [link to relevant documentation]. Figure 4 and Figure 6At this time, the main motion frame 400 sequentially drives the first drive arm 810 and the second drive arm 820 to adjust the reclining angle of the backrest assembly 500. This seat device uses only one linear actuator 300, which can drive the leg support assembly 600 to fully open first, and then continue to drive the backrest assembly 500 to adjust the reclining angle. It can also control the backrest assembly 500 to return to its original position and to store the leg support assembly 600.

[0026] Specifically, when the first swing guide mechanism 710 is in the first retracted position, the second swing guide mechanism 720 is in the second retracted position, meaning the front of the main motion frame 400 and the leg support assembly 600 are both retracted below the seat cushion frame 200; when the first swing guide mechanism 710 is in the first extended position, the second swing guide mechanism 720 is in the second extended position, meaning the front of the main motion frame 400 and the leg support assembly 600 reach their maximum extension beyond the front of the seat cushion frame 200; when the first swing guide mechanism 710 is in the first transition position between the first retracted position and the first extended position, the second swing guide mechanism 720 is in the second transition position between the second retracted position and the second extended position. It should be noted that: see [link to relevant documentation]. Figure 6 The line connecting the first drive arm 810 and the second drive arm 820 is shown as the dashed line abc. In the initial state of the leg support assembly 600 being folded and stored, the first drive arm 810 and the second drive arm 820 intersect to form an obtuse angle with the opening facing upward. When the leg support assembly 600 is unfolded to the point where the first swing guide mechanism 710 has just reached the first unfolded position, the first drive arm 810 and the second drive arm 820 intersect to form an obtuse angle with the opening facing downward.

[0027] Therefore, see Figure 2 and Figure 6 When the linear actuator 300 pushes the main motion frame 400 forward, the first swing guide mechanism 710 drives the front side of the main motion frame 400 to swing downward. Simultaneously, the front side of the main motion frame 400 swings downward, and the leg support assembly 600 is linked to the second swing guide mechanism 720 to flip forward relative to the seat cushion frame 200 and unfold. During this process, the angle between the first drive arm 810 and the second drive arm 820 changes from an upward-opening obtuse angle to a downward-opening obtuse angle. That is, the rear side of the main motion frame 400 drives the first drive arm 810 to rotate slightly counterclockwise relative to the support 100, and the first drive arm 810 drives the second drive arm 820 to rotate slightly clockwise relative to the backrest assembly 500. (See also...) Figure 3 and Figure 6 The backrest assembly 500 first swings slightly forward and then slightly backward relative to the seat cushion frame 200, so that when the leg support assembly 600 is just fully extended from the seat cushion frame 200, the angular position of the backrest assembly 500 relative to the seat cushion frame 200 remains basically unchanged. Then, see... Figure 4 and Figure 6The linear actuator 300 continues to push the main motion frame 400 forward. The first swing guide mechanism 710 moves along the first extension section, and the second swing guide mechanism 720 moves along the second extension section. The leg support assembly 600 remains extended. The main motion frame 400 drives the first drive arm 810 to continue to rotate counterclockwise. The angle between the second drive arm 820 and the first drive arm 810 with the opening facing downward gradually decreases to an acute angle. The backrest assembly 500 gradually swings backward relative to the seat cushion frame 200, thereby realizing the function of the backrest assembly 500 gradually tilting backward after the leg support assembly 600 extends.

[0028] See Figure 5 In some embodiments of the present invention, the first swing guide mechanism 710 includes a first guide post 711 fixedly disposed on the seat cushion frame 200 and a first guide groove 712 disposed on the main motion frame 400 and through which the first guide post 711 movably passes. The first guide groove 712 includes a first oblique bar hole 713, a second oblique bar hole 714 and a first straight bar hole 715 connected in sequence. The first straight bar hole 715 constitutes the first extension section. The length direction of the main motion frame 400 extends approximately along the front-rear direction. The first oblique bar hole 713 is inclined upward toward the rear side of the main motion frame 400. The second oblique bar hole 714 is inclined downward toward the rear side of the main motion frame 400. The first straight bar hole 715 is parallel to the length direction of the main motion frame 400. The first guide post 711 slides backward along the first guide groove 712 to make the front side of the main motion frame 400 swing downward and then swing upward, thereby driving the leg support assembly 600 to extend to the front of the seat cushion frame 200 through the second swing guide mechanism 720. Understandably, when the linear actuator 300 drives the main motion frame 400 to move forward, the first guide post 711 moves along the first inclined bar hole 713 to the second inclined bar hole 714, thereby causing the front side of the main motion frame 400 to swing downward. The movement of the main motion frame 400 drives the leg support assembly 600 to generate a downward flipping movement. When the first guide post 711 moves along the second inclined bar hole 714 to the front end of the first straight bar hole 715, the movement of the main motion frame 400 drives the leg support assembly 600 to generate an upward and forward flipping movement, thereby causing the leg support assembly 600 to extend to the front of the seat cushion frame 200. When the first guide post 711 moves backward along the first straight bar hole 715, the leg support assembly 600 remains extended. The rear side of the main motion frame 400 drives the first drive arm 810 and the second drive arm 820 to move, causing the backrest assembly 500 to swing backward for adjustment. The first swing guide mechanism 710 described above has a very simple structure, low cost, high certainty of relative motion between components, and smooth and reliable transmission.

[0029] See Figure 5In some embodiments of the present invention, the leg support assembly 600 includes a first strip plate 610, a second strip plate 620, a third strip plate 630, a fourth strip plate 640, and a footrest plate 650. One end of the first strip plate 610 is rotatably connected to the seat cushion frame 200, and the other end of the first strip plate 610 is rotatably connected to one end of the second strip plate 620. One end of the third strip plate 630 is rotatably connected to the seat cushion frame 200, and the other end of the third strip plate 630 is rotatably connected to one end of the fourth strip plate 640. The other ends of the second strip plate 620 and the fourth strip plate 640 are respectively rotatably connected to the footrest plate 650. The first strip plate 610 and the fourth strip plate 640... The first strip plate 610 and the fourth strip plate 640 are rotatably connected at their intersections, so that the first strip plate 610, the second strip plate 620, the fourth strip plate 640 and the footrest plate 650 form a parallelogram mechanism, and the first strip plate 610, the third strip plate 630, the fourth strip plate 640 and the seat cushion frame 200 form a parallelogram mechanism. The second swing guide mechanism 720 includes a second guide post 721 fixedly disposed on the main motion frame 400 and a second guide groove 722 disposed on the first strip plate 610. The second guide post 721 slides in the second guide groove 722 to drive the first strip plate 610 to rotate relative to the seat cushion frame 200. Understandably, when the main motion frame 400 moves forward and swings up and down relative to the seat frame 200, the first guide post 711 slides in the first guide groove 712, and the second guide post 721 slides in the second guide groove 722, thereby driving the first strip plate 610 to rotate clockwise and extend relative to the seat frame 200. During this process, the second strip plate 620, the third strip plate 630, the fourth strip plate 640, and the footrest plate 650 also rotate together to extend in front of the seat frame 200. The support plate 650 is nearly flush with the upper surface of the seat cushion frame 200. The first strip plate 610, the second strip plate 620, the fourth strip plate 640 and the footrest plate 650 form a parallelogram mechanism. The first strip plate 610, the third strip plate 630, the fourth strip plate 640 and the seat cushion frame 200 form another parallelogram mechanism. The first strip plate 610 and the fourth strip plate 640 are the common parts of the two parallelogram mechanisms, forming two intersecting parallelogram mechanisms.

[0030] See Figure 5In some embodiments of the present invention, the second guide groove 722 includes a first waist-shaped hole 723, a ramp elongated hole 724 and a second waist-shaped hole 725 sequentially connected along the length direction of the first strip plate 610. The second waist-shaped hole 725 constitutes the second extension section. The first waist-shaped hole 723 and the second waist-shaped hole 725 are parallel to each other and extend along the length direction of the first strip plate 610. When the second guide post 721 moves from the first waist-shaped hole 723 to the second waist-shaped hole 725, it drives the first strip plate 610 to flip from below the seat cushion frame 200 to extend in front of the seat cushion frame 200. It should be noted that initially, the leg support assembly 600 is completely retracted under the seat cushion frame 200. At this time, the first guide post 711 is located at the front end of the first inclined strip hole 713, and the second guide post 721 is located in the middle of the first waist-shaped hole 723. When the linear actuator 300 drives the main motion frame 400 forward to move the first guide post 711 along the first inclined strip hole 713 to the second inclined strip hole 714, the main motion frame 400 drives the second guide post 721 to move to the front end of the first waist-shaped hole 723, while simultaneously actuating the first strip plate 610 relative to the seat cushion frame 200. 0. Rotate clockwise to vertical downwards, then the linear actuator 300 continues to drive the main motion frame 400 forward so that the first guide post 711 moves along the second inclined strip hole 714 to the first straight strip hole 715. At this time, the main motion frame 400 drives the second guide post 721 to move towards the rear end of the first waist-shaped hole 723 or the front end of the inclined long hole 724. At the same time, it moves the first strip plate 610 to rotate clockwise relative to the seat frame 200 to extend forward. When the second guide post 721 moves to the second waist-shaped hole 725, the first strip plate 610 is at its maximum unfolding angle. Similarly, when the linear actuator 300 drives the main motion frame 400 to move backward, the first guide post 711 passes through the first straight bar hole 715, the second inclined bar hole 714, and the first inclined bar hole 713 in sequence, while the second guide post 721 passes through the second waist-shaped hole 725, the inclined elongated hole 724, and the first waist-shaped hole 723 in sequence. The main motion frame 400 and the leg support assembly 600 both return to their original positions and are stored under the seat cushion frame 200. The second swing guide mechanism 720 has a very simple structure, low cost, high certainty of relative motion between components, and smooth and reliable transmission. Moreover, the second swing guide mechanism 720, in conjunction with the first swing guide mechanism 710, cleverly achieves the function of switching the leg support assembly 600 from the stored state to the unfolded state and from the unfolded state to the stored state.

[0031] See Figure 4 and Figure 5In some embodiments of the present invention, the seat cushion frame 200 includes a rectangular frame, the linear actuator 300 includes a linear guide rail 310 and a slider 320 reciprocatingly slidably disposed on the linear guide rail 310, one end of the linear guide rail 310 is pivotally connected to the middle position of the width direction of the rear side of the rectangular frame, and the other end of the linear guide rail 310 points to the middle position of the width direction of the front side of the rectangular frame, the main motion frame 400 includes two parallel straight tubes 410 and a mounting bracket 420 connected between the close ends of the two straight tubes 410, the mounting bracket 420 is rotatably connected to the slider 320 through a pivot orthogonal to the linear guide rail 310, and the leg support assembly 600 includes two leg support units respectively movably connected to the front side of the two straight tubes 410, the two leg support units, the two straight tubes 410, and the mounting bracket 420 are all arranged symmetrically about the linear guide rail 310. Understandably, when the slider 320 moves forward along the linear guide rail 310, it drives the main motion frame 400 to move forward relative to the seat cushion frame 200. Under the guidance of the first guide post 711 and the first guide groove 712, the main motion frame 400 rotates around the pivot relative to the slider 320, causing the front of the main motion frame 400 to swing downwards and then upwards. The linear guide rail 310 extends along the middle of the width of the rectangular frame. The two leg support units, the two straight tubes 410, and the mounting bracket 420 are all arranged symmetrically about the linear guide rail 310, which helps improve the support stability of the bracket 100 on the seat cushion frame 200 and improves the reliability of the reciprocating motion of the main motion frame 400.

[0032] See Figures 1 to 4In some embodiments of the present invention, a connecting arm 830 is further included. The seat cushion frame 200 is rotatably connected to the support 100 via a first pivot 201. The first drive arm 810 is rotatably connected to the support 100 via a second pivot 811. One end of the connecting arm 830 is rotatably connected to the support 100 via a third pivot 831. The other end of the connecting arm 830 is rotatably connected to the seat cushion frame 200 via a fourth pivot 832. The support 100, the seat cushion frame 200, the connecting arm 830, and the first drive arm 810 form a planar four-bar linkage. Understandably, when the main motion frame 400 moves forward and swings up and down relative to the seat cushion frame 200, the main motion frame 400 drives the first drive arm 810 to rotate around the second pivot 811. The first drive arm 810, through the connecting arm 830, drives the seat cushion frame 200 to rotate around the first pivot 201. During this process, the first drive arm 810 and the connecting arm 830 produce a relatively large amplitude of planar oscillation, while the seat cushion frame 200 swings relatively small relative to the frame. The first drive arm 810 acts as the active member, driving the backrest assembly 500 to rotate backward relative to the seat cushion frame 200 through the second drive arm 820. The planar four-bar linkage formed by the bracket 100, seat cushion frame 200, connecting arm 830, and first drive arm 810 facilitates the smooth backward or forward rotation of the backrest assembly 500 relative to the seat cushion frame 200, thereby achieving backrest angle adjustment and providing good load-bearing capacity.

[0033] See Figure 4 In some embodiments of the present invention, the first drive arm 810 is provided with an angle positioning member 812, and the bracket 100 is provided with an angle positioning groove 101 with a U-shaped opening that cooperates with the angle positioning member 812. After the angle positioning member 812 enters the angle positioning groove 101, the backrest assembly 500 is stabilized at the angle position corresponding to the zero-gravity mode. It can be imagined that when the backrest assembly 500 is located at the angle position corresponding to the zero-gravity mode, the weight of the human body exerts a large pressure on the backrest assembly 500. At this time, it is necessary to maintain the stability of the angle of the backrest assembly 500 and prevent the planar four-bar linkage composed of the bracket 100, seat cushion frame 200, connecting arm 830 and first drive arm 810 from displacing when the backrest assembly 500 is under pressure. When the backrest assembly 500 is under force and has a tendency to rotate backward, the angle positioning member 812 abuts against the groove wall of the angle positioning groove 101 to prevent the backrest assembly 500 from continuing to rotate backward.

[0034] See Figure 4In some embodiments of the present invention, in order to further fix the backrest assembly 500 in the angular position corresponding to the zero gravity mode, after the angle positioning member 812 enters the angle positioning groove 101, the first pivot 201, the third pivot 831 and the second pivot 811 are on the same straight line. When the linear actuator 300 drives the main motion frame 400 to move backward, it drives the first drive arm 810 to rotate around the second pivot 811, causing the angle positioning member 812 to leave the angle positioning groove 101. When the backrest assembly 500 has a tendency to swing forward relative to the seat cushion frame 200, the second drive arm 820 drives the angle positioning member 812 to abut against the inner wall of the angle positioning groove 101. It should be noted that when the first pivot 201, the third pivot 831, and the second pivot 811 are on the same straight line, the planar four-bar linkage composed of the bracket 100, the seat frame 200, the connecting arm 830, and the first drive arm 810 is in a dead position. If the backrest assembly 500 swings forward relative to the seat frame 200, the second drive arm 820 will drive the angle positioning member 812 to abut against the inner wall of the angle positioning groove 101. That is, the backrest assembly 500, as the active member, cannot swing forward relative to the seat frame 200. It can only be rotated by the first drive arm 810 around the second pivot 811 so that the angle positioning member 812 leaves the angle positioning groove 101, thereby further improving reliability and stability.

[0035] See Figures 1 to 4 In some embodiments of the present invention, in order to reduce material costs while ensuring mechanical strength, the first drive arm 810, the second drive arm 820 and the connecting arm 830 are all sheet metal parts. The first drive arm 810, the second drive arm 820 and the connecting arm 830 are respectively arranged on both sides of the width direction of the seat frame 200. The angle positioning member 812 is a positioning straight tube vertically connected between the two first drive arms 810. The bracket 100 is provided with an angle positioning groove 101 at both ends of the positioning straight tube.

[0036] In some embodiments of the present invention, in order to facilitate the first drive arm 810 to smoothly drive the angle positioning member 812 into or out of the angle positioning groove 101, the U-shaped opening of the angle positioning groove 101 is set downward, the inner peripheral wall of the angle positioning groove 101 is attached to the outer peripheral wall of the positioning straight tube, and the front edge of the angle positioning groove 101 is provided with a chamfered portion to guide the positioning straight tube into or out of the angle positioning groove 101.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A seat device for segmented adjustment of backrest angle, characterized in that, include: A support (100) is rotatably connected to a cushion frame (200) that can swing up and down relative to it. A linear actuator (300), the main body of which is rotatably connected to the seat frame (200). The main motion frame (400) is rotatably connected to the output end of the linear actuator (300) at its middle part, and a first drive arm (810) is rotatably connected between the rear side of the main motion frame (400) and the bracket (100). A backrest assembly (500) is rotatably disposed on the rear side of the seat cushion frame (200), and a second drive arm (820) is rotatably connected between the backrest assembly (500) and the first drive arm (810). The leg support assembly (600) is rotatably connected to the front side of the seat cushion frame (200); A first swing guide mechanism (710) is disposed between the front side of the main motion frame (400) and the seat cushion frame (200) for driving the main motion frame (400) to swing relative to the seat cushion frame (200). The first swing guide mechanism (710) has a first storage position, a first transition position and a first unfold position. The first unfold position has a first extension section. The second swing guide mechanism (720) is located between the front side of the leg support assembly (600) and the main motion frame (400) and is used to drive the leg support assembly (600) to rotate. The second swing guide mechanism (720) has a second storage position, a second transition position and a second unfolded position. The second unfolded position has a second extension section. During the process of the second swing guide mechanism (720) switching from the second storage position to the second unfolded position, the first drive arm (810) and the second drive arm (820) form an obtuse angle, causing the backrest assembly (500) to rotate slightly. When the first swing guide mechanism (710) moves along the first extension, the second swing guide mechanism (720) moves along the second extension, keeping the leg support assembly (600) unfolded. At this time, the rear side of the main motion frame (400) sequentially drives the first drive arm (810) and the second drive arm (820) to move, thereby increasing the angle at which the backrest assembly (500) swings backward.

2. The seat device for segmented backrest angle adjustment according to claim 1, characterized in that: The first swing guide mechanism (710) includes a first guide post (711) fixedly mounted on the seat frame (200) and a first guide groove (712) mounted on the main motion frame (400) for the first guide post (711) to pass through. The first guide groove (712) includes a first oblique bar hole (713), a second oblique bar hole (714), and a first straight bar hole (715) connected in sequence. The first straight bar hole (715) constitutes the first extension section. The length direction of the main motion frame (400) extends approximately along the front-rear direction. The first oblique bar hole (713)... 3) The second inclined strip hole (714) is inclined downward toward the rear side of the main motion frame (400), the first straight strip hole (715) is parallel to the length direction of the main motion frame (400), and the first guide post (711) slides backward along the first guide groove (712) to make the front side of the main motion frame (400) swing downward and then swing upward, thereby driving the leg support assembly (600) to extend to the front of the seat cushion frame (200) through the second swing guide mechanism (720).

3. The seat device for segmented backrest angle adjustment according to claim 2, characterized in that: The leg support assembly (600) includes a first strip plate (610), a second strip plate (620), a third strip plate (630), a fourth strip plate (640), and a footrest plate (650). One end of the first strip plate (610) is rotatably connected to the seat cushion frame (200), and the other end of the first strip plate (610) is rotatably connected to one end of the second strip plate (620). One end of the third strip plate (630) is rotatably connected to the seat cushion frame (200), and the other end of the third strip plate (630) is rotatably connected to one end of the fourth strip plate (640). The other ends of the second strip plate (620) and the fourth strip plate (640) are respectively rotatably connected to the footrest plate (650). The first strip plate (610) and the fourth strip plate (640) are arranged crosswise. The first strip plate (610) and the fourth strip plate (640) are rotatably connected at their intersections, so that the first strip plate (610), the second strip plate (620), the fourth strip plate (640) and the footrest plate (650) form a parallelogram mechanism. The first strip plate (610), the third strip plate (630), the fourth strip plate (640) and the seat cushion frame (200) also form a parallelogram mechanism. The second swing guide mechanism (720) includes a second guide post (721) fixedly disposed on the main motion frame (400) and a second guide groove (722) disposed on the first strip plate (610). The second guide post (721) slides in the second guide groove (722) to drive the first strip plate (610) to rotate relative to the seat cushion frame (200).

4. A seat device for segmented backrest angle adjustment according to claim 3, characterized in that: The second guide groove (722) includes a first waist-shaped hole (723), a ramp elongated hole (724), and a second waist-shaped hole (725) sequentially connected along the length direction of the first strip plate (610). The second waist-shaped hole (725) constitutes the second extension section. The first waist-shaped hole (723) and the second waist-shaped hole (725) are parallel to each other and extend along the length direction of the first strip plate (610). When the second guide post (721) moves from the first waist-shaped hole (723) to the second waist-shaped hole (725), it drives the first strip plate (610) to flip from below the cushion frame (200) to extend in front of the cushion frame (200).

5. A seat device for segmented backrest angle adjustment according to claim 1, characterized in that: The seat frame (200) includes a rectangular frame. The linear actuator (300) includes a linear guide rail (310) and a slider (320) reciprocatingly sliding on the linear guide rail (310). One end of the linear guide rail (310) is pivotally connected to the middle position of the width direction on the rear side of the rectangular frame, and the other end of the linear guide rail (310) points to the middle position of the width direction on the front side of the rectangular frame. The main motion frame (400) includes two parallel straight tubes (410) and a connecting... A mounting bracket (420) is located between the two adjacent ends of the two straight tubes (410). The mounting bracket (420) is rotatably connected to the slider (320) via a pivot orthogonal to the linear guide (310). The leg support assembly (600) includes two leg support units that are movably connected to the front sides of the two straight tubes (410). The two leg support units, the two straight tubes (410), and the mounting bracket (420) are all arranged symmetrically about the linear guide (310).

6. A seat device for segmented backrest angle adjustment according to claim 1, characterized in that: It also includes a connecting arm (830), the seat cushion frame (200) is rotatably connected to the support (100) via a first pivot (201), the first drive arm (810) is rotatably connected to the support (100) via a second pivot (811), one end of the connecting arm (830) is rotatably connected to the support (100) via a third pivot (831), and the other end of the connecting arm (830) is rotatably connected to the seat cushion frame (200) via a fourth pivot (832). The support (100), the seat cushion frame (200), the connecting arm (830) and the first drive arm (810) form a planar four-bar linkage.

7. A seat device for segmented backrest angle adjustment according to claim 6, characterized in that: The first drive arm (810) is provided with an angle positioning component (812), and the bracket (100) is provided with an angle positioning groove (101) with a U-shaped opening that cooperates with the angle positioning component (812). After the angle positioning component (812) enters the angle positioning groove (101), the backrest assembly (500) is stabilized at the angle position corresponding to the zero gravity mode.

8. A seat device for segmented adjustment of backrest angle according to claim 7, characterized in that: After the angle positioning member (812) enters the angle positioning groove (101), the first pivot (201), the third pivot (831) and the second pivot (811) are on the same straight line. When the linear actuator (300) drives the main motion frame (400) to move backward, it drives the first drive arm (810) to rotate around the second pivot (811) so that the angle positioning member (812) leaves the angle positioning groove (101). When the backrest assembly (500) has a tendency to swing forward relative to the seat cushion frame (200), the second drive arm (820) drives the angle positioning member (812) to abut against the inner wall of the angle positioning groove (101).

9. A seat device for segmented backrest angle adjustment according to claim 8, characterized in that: The first drive arm (810), the second drive arm (820) and the connecting arm (830) are all sheet metal parts. The first drive arm (810), the second drive arm (820) and the connecting arm (830) are respectively arranged on both sides of the width direction of the seat frame (200). The angle positioning component (812) is a positioning straight tube vertically connected between the two first drive arms (810). The bracket (100) is provided with an angle positioning groove (101) at both ends of the positioning straight tube.

10. A seat device for segmented adjustment of backrest angle according to claim 9, characterized in that: The U-shaped opening of the angle positioning groove (101) is set downward, the inner peripheral wall of the angle positioning groove (101) is attached to the outer peripheral wall of the positioning straight tube, and the front edge of the angle positioning groove (101) is provided with a chamfered part to guide the positioning straight tube into or out of the angle positioning groove (101).

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