A seating device and its linkage device

Abstract

The present application discloses a seating furniture and its linkage device, which is applicable to seating furniture with a rocking function. The linkage device includes a seat frame, and further includes: a rocking assembly rotatably connected to the seat frame; a linkage mechanism including a connecting rod assembly and an extension assembly connected to the connecting rod assembly, the connecting rod assembly being connected to the rocking assembly; a backrest assembly connected to the connecting rod assembly; a driving mechanism connected to the rocking assembly and the extension assembly for driving the extension assembly to move between a sitting position and a lying position; wherein, when the driving mechanism drives the extension assembly to move from the sitting position to the lying position to a set stroke, the connecting rod assembly restricts the rocking assembly from rotating relative to the seat frame. The seating furniture and its linkage device of the present application have a simple structure, and not only have the rocking function in the sitting position, but also can maintain the stability in the lying position.

Description

Technical Field

[0001] This application relates to the technical field of household articles, and particularly relates to a seat and its linkage device. Background Art

[0002] With the development of society, people's pursuit of the quality of life has been continuously improved. For the selection of furniture, consumers are no longer limited to a single function. Instead, they hope to maximize the utilization rate of furniture, and the requirements for the functionality and comfort of sofas and seats are also increasing day by day.

[0003] Currently in the market, there are sofas with adjustable position postures and sofas with a rocking function. Generally, the adjustable postures include a normal sitting posture, a leisure posture in an extended position, and a lying posture in a reclined position. If a sofa with an adjustable position posture is added with a rocking function, during actual use, when the sofa is in the lying posture, the overall center of gravity of the sofa will move forward. Therefore, when rocking back and forth in this state, it will cause the center of gravity of the entire sofa to be unstable, posing a safety hazard in the lying and resting state. Summary of the Invention

[0004] To solve the above technical problems, this application provides a seat and its linkage device, which has a simple structure, has both a rocking function in the sitting posture and can maintain the stability in the lying posture, improving the comfort of the user while ensuring safety.

[0005] In a first aspect, this application provides a linkage device applicable to a seat with a rocking function. The linkage device includes a seat frame, and further includes:

[0006] A rocking assembly rotatably connected to the seat frame;

[0007] A linkage mechanism including a connecting rod assembly and an extension assembly connected to the connecting rod assembly, the connecting rod assembly being connected to the rocking assembly;

[0008] A backrest assembly connected to the connecting rod assembly;

[0009] A driving mechanism connected to the rocking assembly and the extension assembly for driving the extension assembly to move between a sitting posture and a lying posture;

[0010] Wherein, when the driving mechanism drives the extension assembly to move from the sitting posture to the lying posture to a set stroke, the connecting rod assembly restricts the rocking assembly from rotating relative to the seat frame.

[0011] By adopting the above technical solution, the linkage device has only two usage postures, namely sitting posture and lying posture. Compared with traditional seating furniture, it has a simpler structure, fewer components, lower production costs and higher production efficiency. The linkage device can not only achieve the function of switching between sitting and lying postures, but also the swing component can achieve the rocking function of a rocking chair, with better functionality. When the extension component is in the lying posture state, the link component automatically restricts the rotation of the swing component according to the stroke position, making the lying posture state more stable and safer.

[0012] In combination with the first aspect, a further solution is that the movement of the extension component from the sitting posture to the lying posture is the total stroke, and the set stroke is between one-half and three-quarters of the total stroke.

[0013] By adopting the above technical solution, when the extension component moves to the position of one-half to three-quarters of the stroke, the swing component cannot swing, which can make the body more stable in the semi-reclined state when the occupant lifts their feet off the ground and leans back, and the occupant has a higher sense of security.

[0014] In combination with the first aspect, a further solution is that a first limiting mechanism is provided between the link component and the swing component. When the extension component moves to the set stroke, the link component and the swing component are connected through the limiting mechanism to restrict the rotation of the swing component relative to the seat frame.

[0015] By adopting the above technical solution, when the extension component moves to the set stroke, the link component and the swing component are locked through the limiting mechanism to restrict the swing of the swing component. The separately provided limiting mechanism can ensure the reliability of the function, and at the same time, the installation position can be flexibly adjusted according to products of different specifications, the design and assembly are more flexible, and it is also convenient for after-sales maintenance.

[0016] In combination with the first aspect, a further solution is that the limiting mechanism includes a link limiting member connected to the link component and a swing limiting member connected to the swing component. When the extension component moves to the set stroke, the link limiting member and the swing limiting member are connected to restrict the rotation of the swing component relative to the seat frame.

[0017] By adopting the above technical solution, the swing component is provided with a swing limiting member, and the link component is provided with a link limiting member, realizing the engagement and disengagement of different strokes of the extension component through a simple structure, with a simple and reliable structure.

[0018] In combination with the first aspect, a further solution is that a second limiting mechanism is provided between the backrest component and the link component. When the extension component moves between the sitting posture and the lying posture, the second limiting mechanism defines the rotation range of the backrest component.

[0019] By adopting the above technical solution, when the stretching component moves between the sitting position and the lying position, the backrest component rotates together. The second limiting mechanism can limit the rotation range of the backrest component, making the support of the backrest component to the human back more reliable, reducing the stress on the link component, and improving the service life of the overall device.

[0020] In combination with the first aspect, a further solution is that the link component includes a link frame, a sliding rod, a limiting rod, a first link, a second link, a third link, and a pull rod. One end of the limiting rod is pivotally connected to the swing component, and the other end is slidably connected to the sliding rod. The sliding rod is pivotally connected to the swing component; the first link is pivotally connected between the swing component and the link frame, and the pull rod is pivotally connected between the backrest component and the stretching component; one end of the second link is pivotally connected to the swing component, and the other end is pivotally connected to the third link. The second link is pivotally connected to the link frame between the two pivot axes, and the end of the third link away from the second link is pivotally connected to the pull rod.

[0021] By adopting the above technical solution, the link component is connected to the swing component. Through the innovative design of the link component, the link component can swing together with the swing component, can also move between the sitting position and the lying position, can realize the swinging experience in the sitting position before locking between the link component and the swing component, and can also limit the movement of the swing component in the lying position to achieve stable lying rest.

[0022] In combination with the first aspect, a further solution is that the backrest component includes a backrest frame and a backrest link pivotally connected to the backrest frame. The backrest frame is hinged to the link frame. The end of the backrest link away from the backrest frame is hinged to the limiting rod and is slidably connected to the sliding rod. The pull rod is pivotally connected to the backrest component at the pivot axis where the backrest frame and the backrest link are pivotally connected.

[0023] By adopting the above technical solution, the backrest component can move in coordination with the link component under the drive of the link frame, the pull rod, and the limiting rod and the limitation of the sliding rod, realizing the angular change of the backrest frame in different postures.

[0024] In combination with the first aspect, a further solution is that the stretching assembly includes a first stretching rod, a second stretching rod pivotally connected to the first stretching rod, a third stretching rod, a fourth stretching rod pivotally connected to the third stretching rod, and a footrest. One end of the first stretching rod away from the second stretching rod is hinged to the link frame, one end of the second stretching rod away from the first stretching rod is hinged to the footrest, one end of the third stretching rod away from the fourth stretching rod is hinged to the link frame, one end of the fourth stretching rod away from the third stretching rod is hinged to the footrest, the second stretching rod and the third stretching rod are pivotally connected, the driving mechanism is connected to the third stretching rod, and the pull rod is hinged to the first stretching rod.

[0025] By adopting the above technical solution, the driving mechanism drives the third stretching rod to rotate. The third stretching rod drives the fourth stretching rod and the second stretching rod to rotate. The fourth stretching rod and the second stretching rod drive the footrest to rotate. The second stretching rod drives the first stretching rod to rotate. The first stretching rod drives the pull rod to move. The pull rod drives the backrest assembly and the third link to rotate. The third link drives the second link to rotate to drive the link frame to move closer to or away from the swing assembly. Through the above structural design, the synchronous movement of the stretching assembly, the backrest assembly and the link frame can be realized, so as to realize the conversion of different postures and at the same time realize the zero-gravity experience.

[0026] In combination with the first aspect, a further solution is that the swing assembly includes a swing rod, a first rocker and a second rocker rotatably connected between the swing rod and the seat frame. The limiting rod is pivotally connected to the swing rod. The limiting rod is provided with a limiting groove / limiting post. The first rocker is provided with a limiting post / limiting groove. When the stretching assembly moves to the set stroke, the limiting groove is engaged with the limiting post.

[0027] By adopting the above technical solution, the swing rod can swing relative to the seat frame through the first rocker and the second rocker. When the stretching assembly moves to the set stroke, the limiting groove is engaged with the limiting post to limit the relative movement between the limiting rod and the first rocker, so as to limit the rotation of the swing rod relative to the seat frame. The structure is simple and reliable.

[0028] In the second aspect, the present application provides a seat including the linkage device described in the first aspect.

[0029] In combination with the second aspect, a further solution is that the link frame is connected with a seat cushion, and the backrest frame is connected with a backrest. In the lying posture state, the included angle between the seat cushion plane and the horizontal plane is 17°-50°, and the included angle between the backrest and the seat cushion is 120°-150°.

[0030] By adopting the above technical solutions, the seating device can achieve a rocking function and two usage states of sitting and lying postures. During the conversion process between the two postures, the backrest frame, the extension component, and the connecting rod frame are linked. In the lying posture state, the angle between the seat cushion plane connected to the connecting rod frame and the horizontal plane can be 17° - 50°, preferably 18.5°, and the angle between the backrest connected to the backrest frame and the seat cushion is 120° - 150°, preferably 140°. At this time, it is the most comfortable posture, realizing the zero-gravity experience of the occupant.

[0031] In summary, the present application has at least one of the following beneficial technical effects:

[0032] 1. The linkage device of the present application has a simpler structure, uses fewer components, has a lower production cost, and a higher production efficiency. The design and assembly are more flexible, and it is also convenient for after-sales maintenance.

[0033] 2. For the linkage device of the present application, the linkage device can not only achieve the conversion function between sitting and lying postures, but also the rocking component can achieve the rocking function of the rocking chair, with better functionality. When the extension component is in the lying posture state, the connecting rod component automatically limits the rotation of the rocking component according to the stroke position, making the lying posture state more stable and safer.

[0034] 3. The seating device of the present application can not only achieve the rocking function but also has two usage states of sitting and lying postures, and is more stable in the lying posture state, realizing the zero-gravity experience of the occupant. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a three-dimensional structural schematic diagram of the linkage device of the present application in the sitting posture state;

[0036] Figure 2 is a front view of the linkage device of the present application in the sitting posture state;

[0037] Figure 3 is a rear view of the linkage device of the present application in the sitting posture state;

[0038] Figure 4 is a three-dimensional structural schematic diagram of the linkage device of the present application during the opening process;

[0039] Figure 5 is a front view of the linkage device of the present application during the opening process;

[0040] Figure 6 is a rear view of the linkage device of the present application during the opening process;

[0041] Figure 7 is Figure 6 the enlarged schematic diagram at A in

[0042] Figure 8 is a three-dimensional structural schematic diagram of the linkage device of the present application in the lying posture state;

[0043] Figure 9 is the front view of the linkage device of the present application in the lying position;

[0044] Figure 10 is the rear view of the linkage device of the present application in the lying position;

[0045] Figure 11 is Figure 10 the enlarged schematic view of position B in

[0046] Reference numerals:

[0047] 1, seat frame; 11, turntable; 12, base; 13, chassis; 2, swing assembly; 21, swing rod; 22, first rocker; 221, rocker limit post; 23, second rocker; 24, support rod; 3, backrest assembly; 31, backrest frame; 311, backrest frame limit part; 32, backrest connecting rod; 4, connecting rod assembly; 41, connecting rod frame; 411, rod frame limit post; 412, backrest frame limit post; 42, limit rod; 421, limit groove; 43, pull rod; 44, third connecting rod; 45, second connecting rod; 46, slide rod; 47, first connecting rod; 5, extension assembly; 51, first extension rod; 52, second extension rod; 53, third extension rod; 54, fourth extension rod; 55, footrest; 6, drive mechanism; 61, drive end; 62, push end; 63, push rod. Detailed implementation manners

[0048] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0049] It should be noted that: like reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0051] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0052] The following will describe in detail some embodiments of the present invention with reference to the drawings. Without conflict, the features in the following embodiments can be combined with each other.

[0053] Embodiment 1

[0054] Please refer to Figures 1 - 3 , which is a schematic structural diagram of the sitting posture state of an embodiment of the linkage device of the present application. The linkage device in this embodiment includes a seat frame 1, a linkage mechanism connected to the seat frame 1, and a swing assembly 2 rotatably connected to the seat frame 1. The linkage mechanism includes a link assembly 4 and an extension assembly 5 connected to the swing assembly 2. The link assembly 4 is connected with a backrest assembly 3. A driving mechanism 6 is connected between the swing assembly 2 and the extension assembly 5, and the driving mechanism 6 drives the extension assembly 5 to move between a sitting posture and a lying posture.

[0055] The seat frame 1 includes a base 12 for contacting the ground. The base 12 is connected with a turntable 11, and the turntable 11 is connected with a chassis 13. The chassis 13 can rotate 360° relative to the base 12 through the turntable 11. The swing assembly 2 includes a swing rod 21. The swing rod 21 is connected with the chassis 13 through a first rocker 22 and a second rocker 23 to form a four-bar mechanism, so that the swing rod 21 can swing relative to the chassis 13. The swing rod 21 is also fixedly connected with a support rod 24. The driving mechanism 6 includes a driving end 61 and a pushing end 62. The driving end 61 is hinged with the support rod 24, and the pushing end 62 is hinged with a push rod 63. The driving mechanism 6 in this embodiment is an electric push rod 63. The driving end 61 is a motor, and the pushing end 62 is a push rod 63. In practical applications, a pneumatic or hydraulic driving mechanism can be adopted according to needs.

[0056] Please refer to Figures 1 - 3 , the link assembly 4 includes a link frame 41, a slide rod 46, a limit rod 42, a first link 47, a second link 45, a third link 44 and a pull rod 43. One end of the limit rod 42 is pivotally connected to the swing assembly 2, and the other end is slidably connected to the slide rod 46. The slide rod 46 is pivotally connected to the swing assembly 2. The first link 47 is pivotally connected between the swing assembly 2 and the link frame 41. The pull rod 43 is pivotally connected between the backrest assembly 3 and the extension assembly 5. One end of the second link 45 is pivotally connected to the swing assembly 2, and the other end is pivotally connected to the third link 44. Between the two pivot axes of the second link 45, it is pivotally connected to the link frame 41. The end of the third link 44 away from the second link 45 is pivotally connected to the pull rod 43.

[0057] The backrest assembly 3 includes a backrest frame 31 and a backrest link 32 pivotally connected to the backrest frame 31. The backrest frame 31 is hinged to the link frame 41. One end of the backrest link 32 away from the backrest frame 31 is hinged to the limit rod 42 and is slidably connected to the slide rod 46. The pull rod 43 is pivotally connected to the backrest assembly 3 at the pivot axis where the backrest frame 31 and the backrest link 32 are pivotally connected.

[0058] The extension assembly 5 includes a first extension rod 51, a second extension rod 52 pivotally connected to the first extension rod 51, a third extension rod 53, a fourth extension rod 54 pivotally connected to the third extension rod 53, and a footrest 55. One end of the first extension rod 51 away from the second extension rod 52 is hinged to the link frame 41. One end of the second extension rod 52 away from the first extension rod 51 is hinged to the footrest 55. One end of the third extension rod 53 away from the fourth extension rod 54 is hinged to the link frame 41. One end of the fourth extension rod 54 away from the third extension rod 53 is hinged to the footrest 55. Between the two pivot axes of the second extension rod 52 and between the two pivot axes of the third extension rod 53 are pivotally connected. The push rod 63 is fixedly connected to the third extension rod 53. The drive mechanism 6 is connected to the third extension rod 53 through the push rod 63. The push rod 63 is a hollow tube with a rectangular cross-section. The pull rod 43 is hinged to the first extension rod 51.

[0059] Please refer to Figure 1 As shown in the figure, a rod frame limit post 411 is fixed on the link frame 41. In the sitting position, the rod frame limit post 411 abuts against the second link 45 to limit the second link 45 from continuing to rotate towards the rod frame limit post 411, thereby assisting the drive mechanism 6 to achieve stable and reasonable force in the sitting position. It also helps to achieve a reasonable movement trajectory between the link frame 41 and the swing rod 21 when converting from the sitting position to the lying position. The link frame 41 can move closer to or away from the swing rod 21 to reach the optimal posture for zero-gravity experience.

[0060] Please refer to Figure 2 As shown in the figure, a limit mechanism is provided between the backrest assembly 3 and the link assembly 4. When the extension assembly 5 moves between the sitting position and the lying position, the limit mechanism limits the rotation range of the backrest assembly 3. In this embodiment, it is achieved in the following way: a backrest frame limit post 412 is fixed on the link frame 41, and a backrest frame limit part 311 is provided on the backrest frame 31. The backrest frame limit part 311 is a groove with a set curve. During the conversion from the sitting position to the lying position, the groove abuts against and slides with the backrest frame limit post 412. In the sitting position, the groove abuts against the backrest frame limit post 412 to limit the forward rotation of the backrest frame 31. In the lying position, the groove abuts against the backrest frame limit post 412 to limit the backward rotation of the backrest frame 31.

[0061] In the sitting position, the extension assembly 5 retracts towards the seat frame 1, and the drive mechanism 6, the rod frame limit post 411, and the backrest limit post 412 restrict the movement of the linkage mechanism. The state of the footrest 55 is approximately vertically downward. At this time, the legs of the rider can hang naturally.

[0062] Please refer to Figures 4 - 7 , which is a schematic diagram of the intermediate state structure of an embodiment of the linkage device of this application.

[0063] Please refer to Figures 4 - 6 , the drive mechanism 6 pushes the push rod 63 to move away from the drive end 61. The push rod 63 drives the third extension rod 53 to rotate. The third extension rod 53 drives the fourth extension rod 54 and the second extension rod 52 to rotate. The second extension rod 52 drives the first extension rod 51 to rotate. The first extension rod 51 drives the pull rod 43 to move. The pull rod 43 drives the backrest assembly 3 and the third link 44 to rotate. The third link 44 drives the second link 45 to rotate to drive the link frame 41 to move away from the swing assembly 2. The footrest 55 rotates under the push of the second extension rod 52 and the fourth extension rod 54 to form an angle with the ground, and the angle continuously decreases as it rotates. While the link frame 41 moves away from the swing assembly 2, it moves towards the direction of the footrest 55, and the backrest frame 31 rotates backward, thereby realizing the linkage of the entire device and converting from the sitting position to the lying position in the most comfortable way.

[0064] Please refer to Figure 6 , the sliding rod 46 is provided with a chute, and the pivot shafts of the limit rod 42 and the backrest link 32 are slidably arranged in the chute. The limit rod 42 slides relative to the sliding rod 46 while rotating with the backrest link 32.

[0065] Please refer to Figure 6 and Figure 7 , a limit mechanism is provided between the link assembly 4 and the swing assembly 2. When the extension assembly 5 moves to the set stroke, the link assembly 4 and the swing assembly 2 are connected through the limit mechanism to restrict the relative rotation of the swing assembly 2 with respect to the seat frame 1. The method adopted in this embodiment is as follows: The first rocker 22 is provided with a rocker limit post 221, and the limit rod 42 is provided with a limit groove 421. When the extension assembly 5 moves from the sitting position to the lying position, it is the total stroke. When the extension assembly 5 moves to the set position between one-half and three-quarters of the total stroke, the rocker limit post 221 slides into the limit groove 421. The first rocker 22 and the limit rod 42 are connected through the rocker limit post 221 and the limit groove 421, and the swing rod 21 and the first rocker 22 cannot rotate relative to each other, thereby restricting the relative rotation of the swing assembly 2 with respect to the seat frame 1 and ensuring the stability and safety of the lying position state. In specific applications, a limit groove can be provided on the first rocker 22 and a limit post can be provided on the limit rod 42, or the same function can be achieved through other combined structures, such as a link mechanism, a gear mechanism, or a ratchet and pawl mechanism, etc.

[0066] Please refer toFigures 8 - 11 This is a schematic structural view of the lying position state of an embodiment of the linkage device of the present application. The drive mechanism 6 continues to drive the extension assembly 5 to move away from the seat frame 1. The extension assembly 5 is fully extended, and the support surface of the footrest 55 is approximately parallel to the ground. The backrest frame 31 rotates backward to the maximum angle. The backrest connecting rod 32, the first connecting rod 47, and the second connecting rod 45 rotate to be approximately vertical. In this state, the connecting rod frame 41 is the farthest from the swing rod 21, that is, the seat is lifted.

[0067] Please refer to Figure 11 , in this state, the rocker limit post 221 completely slides into the limit groove 421, and the swing assembly 2 cannot rotate relative to the seat frame 1.

[0068] When converting from the lying position to the sitting position, the drive mechanism 6 drives the push rod 63 to move toward the drive end 61, and the push rod 63 drives the extension assembly 5 to move toward the drive end 61 to the sitting position state.

[0069] Embodiment 2

[0070] This embodiment provides a seating furniture, specifically a seat or a sofa, including the linkage device in Embodiment 1. The connecting rod frame 41 of the linkage device is fixedly connected to the seat cushion of the seating furniture, the backrest is fixedly connected to the backrest frame 31, the footrest 55 is connected with a footrest board, the base 12 is in contact with the ground, and the seating furniture can rotate relative to the base 12 through the turntable 11.

[0071] The seating furniture of this embodiment can realize the swing function and two usage states of the sitting position and the lying position. During the conversion process between the two postures, the backrest, the seat cushion, and the footrest board are linked. In the lying position state, the included angle between the support plane of the seat cushion and the horizontal plane is 17° - 50°, preferably 18.5°, and the included angle between the backrest and the seat cushion is 120° - 150°, preferably 140°. At this time, it is the most comfortable posture, realizing the zero-gravity experience of the occupant.

[0072] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes, modifications, substitutions, and variations, and all these changes, modifications, substitutions, and variations fall within the scope of the present invention claimed.

Claims

1. A linkage device, applicable to a seat with a rocking function, the linkage device comprising a seat frame (1), characterized in that, Further comprising: A swing assembly (2), rotatably connected to the seat frame (1); A linkage mechanism, including a link assembly (4) and an extension assembly (5) connected to the link assembly (4), the link assembly (4) being connected to the swing assembly (2); A backrest assembly (3), connected to the link assembly (4); A drive mechanism (6), connected to the swing assembly (2) and the extension assembly (5), for driving the extension assembly (5) to move between a sitting position and a lying position; Wherein, when the drive mechanism (6) drives the extension assembly (5) to move from the sitting position to the lying position to a set stroke, the link assembly (4) restricts the swing assembly (2) from rotating relative to the seat frame (1); The link assembly (4) includes a link frame (41), a slide rod (46), a limiting rod (42), a first link (47), a second link (45), a third link (44) and a pull rod (43). One end of the limiting rod (42) is pivotally connected to the swing assembly (2), and the other end is slidably connected to the slide rod (46), and the slide rod (46) is pivotally connected to the swing assembly (2); the first link (47) is pivotally connected between the swing assembly (2) and the link frame (41), and the pull rod (43) is pivotally connected between the backrest assembly (3) and the extension assembly (5); one end of the second link (45) is pivotally connected to the swing assembly (2), and the other end is pivotally connected to the third link (44). The second link (45) is pivotally connected to the link frame (41) between the two pivot axes, and the end of the third link (44) away from the second link (45) is pivotally connected to the pull rod (43); The seat frame (1) includes a base (12) for contacting the ground, and the base (12) is connected with a turntable (11).

2. The linkage device according to claim 1, characterized in that, The movement of the extension assembly (5) from the sitting position to the lying position is the total stroke, and the set stroke is between one-half and three-quarters of the total stroke.

3. The linkage device according to claim 1, wherein A first limiting mechanism is provided between the link assembly (4) and the swing assembly (2). When the extension assembly (5) moves to the set stroke, the link assembly (4) and the swing assembly (2) are connected through the limiting mechanism to restrict the swing assembly (2) from rotating relative to the seat frame (1).

4. The linkage device according to claim 3, characterized in that, The limiting mechanism includes a link limiting member connected to the link assembly (4) and a swing limiting member connected to the swing assembly (2). When the extension assembly (5) moves to the set stroke, the link limiting member and the swing limiting member are connected to restrict the swing assembly (2) from rotating relative to the seat frame (1).

5. The linkage device according to claim 1, characterized in that A second limiting mechanism is provided between the backrest assembly (3) and the link assembly (4). When the extension assembly (5) moves between the sitting position and the lying position, the second limiting mechanism defines the rotation range of the backrest assembly (3).

6. The linkage device according to claim 1, wherein, The backrest assembly (3) includes a backrest frame (31) and a backrest link (32) pivotally connected to the backrest frame (31). The backrest frame (31) is hinged to the link frame (41). One end of the backrest link (32) away from the backrest frame (31) is hinged to the limit rod (42) and is slidably connected to the slide rod (46). The pull rod (43) is pivotally connected to the backrest assembly (3) at the pivot axis where the backrest frame (31) is pivotally connected to the backrest link (32).

7. The linkage device according to claim 1, characterized in that, The extension assembly (5) includes a first extension rod (51), a second extension rod (52) pivotally connected to the first extension rod (51), a third extension rod (53), a fourth extension rod (54) pivotally connected to the third extension rod (53), and a footrest (55). One end of the first extension rod (51) away from the second extension rod (52) is hinged to the link frame (41). One end of the second extension rod (52) away from the first extension rod (51) is hinged to the footrest (55). One end of the third extension rod (53) away from the fourth extension rod (54) is hinged to the link frame (41). One end of the fourth extension rod (54) away from the third extension rod (53) is hinged to the footrest (55). The second extension rod (52) and the third extension rod (53) are pivotally connected. The drive mechanism (6) is connected to the third extension rod (53). The pull rod (43) is hinged to the first extension rod (51).

8. A seat, comprising the linkage device according to any one of claims 1-7.

9. The seat according to claim 8, characterized in that, The link frame (41) is connected with a seat cushion. The backrest assembly (3) includes a backrest frame (31) and a backrest link (32) pivotally connected to the backrest frame (31). The backrest frame (31) is connected with a backrest. In the lying state, the included angle between the seat cushion plane and the horizontal plane is 17°-50°, and the included angle between the backrest and the seat cushion is 120°-150°.

Images