Seat posture adjusting device and seat

Abstract

The invention discloses a seat posture adjusting device and a seat, and relates to the technical field of seat manufacturing, the seat posture adjusting device comprises a seat assembly, two leg support assemblies and two backrest assemblies, the seat assembly comprises a fixed frame, two movable frames arranged side by side and a sliding rail component, the two movable frames are slidably connected with the fixed frame through the sliding rail component, and the seat posture adjusting device further comprises a driving assembly; the driving assembly comprises a driving electric cylinder and a pushing piece connected with a driving rod of the driving electric cylinder, the two ends of the pushing piece are connected with the two leg supporting assemblies, the driving electric cylinder is rotationally connected with the fixing frame, the assisting assembly is installed on the moving frame, one end of the assisting assembly is connected with the leg supporting assemblies, and the other end of the assisting assembly is connected with the fixing frame. The posture adjusting device can be stretched and adjusted in sequence according to the sitting posture, the TV posture and the lying posture and can be folded and adjusted in sequence according to the lying posture, the TV posture and the sitting posture, the posture conversion action of the posture adjusting device is smooth, safe and reliable, and the experience feeling of a user is improved.

Description

Technical Field

[0001] This application relates to the field of seat manufacturing technology, and in particular to a seat posture adjustment device. Background Technology

[0002] With the improvement of living standards, chairs need to be able to adjust their posture to meet users' relaxation needs in various scenarios. The chair posture adjustment device consists of three main parts: the seat, the adjustable leg rest and the backrest mounted on the seat. By adjusting these three parts, the chair can be positioned in three postures: sitting, TV posture, and reclining posture. The sitting posture is a folded-back position, the reclining posture is an extended position, and the TV posture is between the folded-back and extended positions. When adjusting the posture adjustment device from the folded-back position to the extended position, the leg rest should extend first, followed by the backrest; when adjusting the posture adjustment device from the extended position to the folded-back position, the backrest should retract first, followed by the leg rest. The above sequence must be followed during posture adjustment; otherwise, it will affect the user experience.

[0003] The posture adjustment of seats in related technologies is usually achieved through multiple independent electric push rods or cylinders. Although this method can provide a certain range of adjustment, the adjustment process is not smooth enough and is prone to uncoordinated movements of different parts, which affects the user experience.

[0004] Therefore, providing a posture adjustment device that can adjust the smoothness and coordination of movements is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to help reduce the technical problem of uncoordinated adjustment actions of posture adjustment devices, this application provides a seat posture adjustment device and a seat.

[0006] In a first aspect, this application provides a seat posture adjustment device, which adopts the following technical solution: A seat posture adjustment device includes a seat assembly, two leg support assemblies connected to the front end of the seat assembly, and two backrest assemblies connected to the rear end of the seat assembly. The seat assembly includes a fixed frame, two movable frames arranged side by side, and a slide rail component. The two movable frames are slidably connected to the fixed frame through the slide rail component. The device also includes a drive assembly for driving the two leg support assemblies and the two backrest assemblies to unfold or retract. The drive assembly includes a drive cylinder and a pusher connected to the drive rod of the drive cylinder. Both ends of the pusher are connected to the two leg support assemblies. The drive cylinder is rotatably connected to the fixed frame. The device also includes an assist assembly for assisting the two leg support assemblies to unfold first or the two backrest assemblies to retract first. The assist assembly is mounted on the movable frame, with one end connected to the leg support assembly and the other end connected to the fixed frame.

[0007] By adopting the above technical solution, when the posture adjustment device changes from a sitting to a reclining position, the drive rod of the electric cylinder extends to push the pusher component. The pusher component drives the leg support assembly to extend first with the assistance of the assist component, and then pushes the moving frame to extend the backrest assembly. When the posture adjustment device changes from a reclining to a sitting position, the drive rod of the electric cylinder retracts to push the pusher component. The pusher component drives the leg support assembly to retract first with the assistance of the assist component, and then pushes the moving frame to retract the backrest assembly. This helps the posture adjustment device to extend and adjust in the order of sitting, reclining, and sitting, and retract in the order of reclining, reclining, and sitting. The posture transition of the posture adjustment device is smooth, safe, and reliable, increasing the user experience.

[0008] Optionally, the backrest assembly includes a first backrest link, a second backrest link, a third backrest link, and a backrest fixing plate. The first backrest link and the second backrest link are rotatably connected to the movable frame, and the third backrest link is rotatably mounted on the fixing frame. One end of the second backrest link is rotatably connected to the third backrest link, and the other end is rotatably connected to the backrest fixing plate. The end of the first backrest link away from the movable frame is rotatably connected to the backrest fixing plate. A first limiting member is provided on the backrest fixing plate near the end connected to the first backrest link. When the seat posture is in a reclining position, the first limiting member abuts against the first backrest link. A second limiting member is provided on the backrest fixing plate near the end connected to the second backrest link. When the seat posture is in a sitting or TV position, the second limiting member abuts against the second backrest link.

[0009] By adopting the above technical solution, the first backrest link and the second backrest link are rotatably mounted on the movable frame. When the drive rod of the drive cylinder retracts, the movable frame moves first with the assistance of the assist component, so that the backrest component is retracted first. This helps to achieve smooth retraction from reclining posture, TV posture and sitting posture in sequence. Under the limitation of the first limit member on the first backrest link, the backrest component is stabilized in the reclining posture. Under the limitation of the second limit member on the second backrest link, the backrest component is stabilized in the TV posture or sitting posture.

[0010] Optionally, the second back link includes a transmission part and a support part fixedly connected to the transmission part. The portion where the transmission part and the support part are joined forms a joint. The joint is rotatably connected to the movable frame. One end of the transmission part away from the joint is rotatably connected to the backrest fixing plate. One end of the support part away from the joint is rotatably connected to the third back link.

[0011] By adopting the above technical solution, the second back link is rotatably connected to the moving frame through the joint, the transmission part is connected to the first back link through the backrest fixing plate, and the support part is connected to the fixing frame through the third back link. When the moving frame moves relative to the fixing frame, it helps the backrest assembly to extend or retract in a certain order, so that the backrest installed on the backrest fixing plate is in a reclining or sitting position.

[0012] Optionally, the leg support assembly includes a first leg link, a second leg link, a third leg link, a fourth leg link, and a leg support mounting plate. One end of the first leg link and one end of the second leg link are rotatably connected to the movable frame, the other end of the first leg link is rotatably connected to one end of the fourth leg link, the other end of the second leg link is rotatably connected to one end of the third leg link, the middle portion of the first leg link is rotatably connected to the middle portion of the third leg link, and the other ends of the third leg link and the fourth leg link are rotatably connected to the leg support mounting plate. The two ends of the pusher are fixedly connected to the first leg link in the two leg support assemblies, the middle portion of the second leg link is connected to the assist component, and the third leg link is provided with a third limiting member. The third limiting member is located between the connection point of the second leg link and the third leg link and the rotatable connection point of the middle portion of the first leg link and the middle portion of the third leg link. When the leg support assembly is in the unfolded state, the first leg link abuts against the third limiting member.

[0013] By adopting the above technical solution, the two ends of the pusher are fixedly connected to the first leg link in the two leg support assemblies, and the middle part of the second leg link is connected to the assist component. One end of the first leg link and one end of the second leg link are rotatably connected to the moving frame. When the drive rod of the drive cylinder extends, the pusher pushes the first leg link. At the same time, with the assistance of the assist component, the second leg link helps the leg support assembly to extend first, realizing the adjustment from sitting posture to TV posture. After the leg support assembly extends, the third limiting component limits the first leg link, so that the leg support assembly is stably maintained in the TV posture or lying posture.

[0014] Optionally, the pusher includes a push rod and two mounting lugs disposed at the middle position of the push rod. The mounting lugs are provided with mounting holes, through which a pin passes. The pin is rotatably connected to the drive rod of the drive cylinder.

[0015] By adopting the above technical solution, the pusher is connected to the first leg connecting rod through the push rod, and the pin is inserted through the mounting holes on the two mounting ears to rotate and connect with the drive rod of the drive cylinder. The drive rod pushes the mounting ears to rotate the push rod, and the push rod drives the first leg connecting rod to rotate, which helps to realize the retraction or extension action of the leg support assembly.

[0016] Optionally, the assistive assembly includes a first assistive rod, a second assistive rod, and an elastic element. The first assistive rod is rotatably mounted on the movable frame. One end of the first assistive rod is connected to one end of the elastic element, and the other end of the first assistive rod is rotatably connected to one end of the second assistive rod. The end of the elastic element away from the first assistive rod is connected to the fixed frame, and the end of the second assistive rod away from the first assistive rod is rotatably connected to the middle of the second leg connecting rod.

[0017] By adopting the above technical solution, the first assist rod is rotatably mounted on the movable frame. One end of the first assist rod is connected to one end of the elastic element, and the other end is rotatably connected to one end of the second assist rod. The other end of the second assist rod is rotatably connected to the middle of the second leg link. Under the action of the first and second assist rods, the elastic element of the leg support assembly is in a stretched state when it is in the folded state. When the leg support assembly changes from a sitting position to a TV position, the elastic element in the stretched state increases the extension force of the leg support assembly under the assistance of the rebound force, which helps the leg support assembly to perform the extension action first. When the backrest assembly changes from a reclining position to a sitting position, the elastic element in the stretched state increases the sliding force of the movable frame relative to the fixed frame under the assistance of the rebound force, which makes the backrest assembly perform the folding action first. With the assistance of the assist components, the posture adjustment is coordinated and smooth in sequence. With the action of the drive electric cylinder, it can replace the multi-power drive to adjust the posture. The structure is simple and can effectively reduce the production and manufacturing cost.

[0018] Optionally, the elastic element is a tension spring or a rubber band.

[0019] By adopting the above technical solution, the elastic element is a tension spring or rubber band, which has a simple structure, reliable operation, and can effectively reduce production and manufacturing costs.

[0020] Optionally, the slide rail component includes a first slide rail fixedly connected to the fixed frame and a second slide rail fixedly connected to the movable frame, wherein the first slide rail and the second slide rail are slidably connected by a rolling assembly.

[0021] By adopting the above technical solution, the first slide rail is fixedly installed on the fixed frame, and the second slide rail is fixedly installed on the movable frame. The first slide rail and the second slide rail are slidably connected by a rolling assembly, which helps to improve the reliability of the movable frame sliding on the fixed frame.

[0022] Optionally, the first slide rail includes a base plate, outer side plates extending vertically upward on both sides of the base plate, the free ends of the outer side plates being bent inward to form upper rails, and the upper rails on both sides forming openings to accommodate the second slide rail; the base plate is fixedly connected to the fixing frame; the second slide rail includes a top plate disposed opposite to the base plate, inner side plates extending vertically downward on both sides of the top plate, the free ends of the inner side plates being bent outward to form lower rails, and the lower rails being arranged at intervals relative to the upper rails; the rolling assembly includes a first rolling element, a second rolling element, and a retainer for preventing the first rolling element and the second rolling element from separating, the first rolling element being disposed between the base plate and the top plate, and the second rolling element being disposed between the upper rail and the lower rail.

[0023] By adopting the above technical solution, by setting a first rolling element between the bottom plate and the top plate, and setting a second rolling element between the upper rail and the lower rail, and by installing the first rolling element and the second rolling element in the cage, it is helpful to improve the stability and reliability of the sliding of the first slide rail and the second slide rail.

[0024] Secondly, this application provides a seat, which adopts the following technical solution: A seat includes a seat posture adjustment device as described above, and further includes a backrest plate mounted on the backrest assembly and a leg support plate mounted on the leg support assembly.

[0025] By adopting the above technical solution, the seat posture adjustment device adopts a design that combines drive components and assist components, realizing the linkage adjustment of the seat leg support and backrest in a certain sequence, making the seat posture adjustment action coordinated, smooth, safe and reliable.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The seat posture adjustment device adopts a design that combines drive components and power assist components, which realizes the coordinated adjustment of the seat leg rest and backrest in a certain sequence, making the seat posture adjustment action coordinated, smooth, safe and reliable, and enhancing the user experience; 2. The first backrest link and the second backrest link are rotatably mounted on the movable frame. One end of the assist component is connected to the fixed frame. When the drive rod of the drive cylinder retracts, the movable frame moves first with the assistance of the assist component, so that the backrest component is retracted first, which helps to achieve smooth retraction from reclining posture, TV posture and sitting posture in sequence. 3. With the help of the rebound force, the elastic element of the assist component helps the leg support component to extend first, or helps the backrest component to close first. The posture adjustment device adjusts smoothly and coordinates. With the action of the drive cylinder, it can replace the multi-power drive to adjust the posture. The structure is simple and can effectively reduce the production and manufacturing cost. 4. A first rolling element is installed between the bottom plate and the top plate, and a second rolling element is installed between the upper rail and the lower rail. The first and second rolling elements are installed in the cage, which helps to improve the stability and reliability of the sliding of the first and second slide rails. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a seat posture adjustment device disclosed in this application when it is in a sitting position.

[0028] Figure 2 This is a schematic diagram of the structure of a seat posture adjustment device disclosed in this application when it is in the TV posture.

[0029] Figure 3 This is a schematic diagram of the structure of a seat posture adjustment device disclosed in this application when it is in a reclining position.

[0030] Figure 4 for Figure 3 A magnified view of the area at position I.

[0031] Figure 5 for Figure 3 A magnified view of a portion of position II.

[0032] Figure 6 for Figure 3 A magnified view of a portion of position III.

[0033] Figure 7 For along Figure 2 Sectional view at point AA.

[0034] Figure 8 This is a structural diagram of a seat in a reclining position as disclosed in this application.

[0035] Explanation of reference numerals in the attached figures: 1. Seat assembly; 11. Fixed frame; 12. Moving frame; 13. Slide rail assembly; 131. First slide rail; 1311. Base plate; 1312. Outer side plate; 1313. Upper rail; 1314. Opening; 132. Second slide rail; 1321. Top plate; 1322. Inner side plate; 1323. Lower rail; 133. Rolling assembly; 1331. First rolling element; 1332. Second rolling element; 1333. Cage; 2. Leg support assembly; 21. First leg link; 22. Second leg link; 23. Third leg link; 231. Third limiting element; 24. Fourth leg link; 25. Leg support mounting plate; 3. Backrest assembly; 31, First backrest link; 32, Second backrest link; 321, Transmission part; 322, Support part; 323, Connecting part; 33, Third backrest link; 34, Backrest fixing plate; 341, Mounting part; 342, First limiting member; 343, Second limiting member; 4, Drive assembly; 41, Drive cylinder; 411, Drive rod; 42, Pushing member; 421, Push rod; 4211, Fixing plate; 422, Mounting ear plate; 4221, Mounting hole; 43, Pin; 5, Power assist assembly; 51, First power assist rod; 52, Second power assist rod; 53, Elastic member; 101, Backrest plate; 102, Leg rest plate. Detailed Implementation

[0036] The following combination Figures 1 to 8 This application will be described in further detail.

[0037] This application discloses a seat posture adjustment device.

[0038] A seat posture adjustment device. (See reference) Figures 1 to 3The system includes a seat assembly 1, two leg support assemblies 2, and two backrest assemblies 3. The two leg support assemblies 2 are mounted on the front end of the seat assembly 1, and the two backrest assemblies 3 are mounted on the rear end of the seat assembly 1. The seat assembly 1 includes a fixed frame 11, two movable frames 12, and a slide rail component 13. The two movable frames 12 are arranged side by side and slidably connected to the fixed frame 11 via the slide rail component 13. The system also includes a drive assembly 4, which is used to drive the two leg support assemblies 2 and the two backrest assemblies 3 to unfold or retract. The drive assembly 4 includes a drive cylinder 41 and a pusher 42 connected to the drive rod 411 of the drive cylinder 41. Both ends of the pusher 42 are connected to the two leg support assemblies 2. The drive cylinder 41 is rotatably connected to the fixed frame 11. The system also includes an assist assembly 5, which is used to assist the two leg support assemblies 2 to unfold first or the two backrest assemblies 3 to retract first. The assist assembly 5 is mounted on the movable frames 12, and one end of the assist assembly 5 is connected to the leg support assemblies 12. One end is connected to component 2, and the other end is connected to the fixed frame 11. When the posture adjustment device changes from a sitting position to a reclining position, the drive rod 411 of the drive cylinder 41 extends to push the pusher 42. The pusher 42 drives the leg support assembly 2. With the assistance of the assist component 5, the leg support assembly 2 first extends, and then pushes the moving frame 12 to drive the backrest assembly 3 to extend. When the posture adjustment device changes from a reclining position to a sitting position, the drive rod 411 of the drive cylinder 41 retracts to push the pusher 42. The pusher 42 drives the leg support assembly 2. With the assistance of the assist component 5, the moving frame 12 drives the backrest assembly 3 to first retract, and then pushes the leg support assembly 2 to retract. This helps the posture adjustment device to extend and adjust in the order of sitting, TV, and reclining, or to retract in the order of reclining, TV, and sitting. The posture adjustment device's posture transition is smooth and safe, increasing the user's experience.

[0039] Reference Figure 3 and Figure 4The backrest assembly 3 includes a first backrest link 31, a second backrest link 32, a third backrest link 33, and a backrest fixing plate 34. The first backrest link 31 and the second backrest link 32 are rotatably connected to the movable frame 12, and the third backrest link 33 is rotatably mounted on the fixing frame 11. One end of the second backrest link 32 is rotatably connected to the third backrest link 33, and the other end of the second backrest link 32 is rotatably connected to the backrest fixing plate 34. The end of the first backrest link 31 away from the movable frame 12 is rotatably connected to the backrest fixing plate 34. The middle part of the backrest fixing plate 34 is provided with a mounting part 341 for mounting the seat backrest panel 101. A first limiting member 342 is provided on the backrest fixing plate 34 near the end connected to the first backrest link 31. When the seat is in a reclining position, the first limiting member 342 abuts against the first backrest link 31, and the first limiting member 342 abuts against the first backrest link 31 near the end connected to the second backrest link 32. One end of the seat is provided with a second limiting member 343. When the seat is in a sitting or TV position, the second limiting member 343 abuts against the second backrest link 32. When adjusting from a reclining position to a sitting position, the drive rod 411 of the drive cylinder 41 retracts. With the assistance of the assist component 5, the moving frame 12 moves first, causing the backrest component 3 to fold up first. This helps to achieve a smooth folding up from the reclining position, TV position, and sitting position in sequence. The first backrest link 31, limited by the first limiting member 342, helps to stabilize the backrest component 3 in the reclining position. The second backrest link 32, limited by the second limiting member 343, helps to stabilize the backrest component 3 in the sitting or TV position. It should be noted that the first limiting member 342 and the second limiting member 343 are both in the form of axle pin structure, which are fixed to the backrest fixing plate 34 by welding or screw fastening.

[0040] Reference Figure 4 The second back link 32 includes a transmission part 321 and a support part 322. The support part 322 is fixedly connected to the transmission part 321. In this embodiment, the support part 322 and the transmission part 321 are integrally formed. In other embodiments of this application, the support part 322 and the transmission part 321 are fixed together by welding or bonding. The part where the transmission part 321 and the support part 322 are joined forms a joint part 323. The joint part 323 is rotatably connected to the movable frame 12. The end of the transmission part 321 away from the joint part 323 is rotatably connected to the backrest fixing plate 34. The end of the support part 322 away from the joint part 323 is connected to the third back link. 33 Rotatable connection; the second back connecting rod 32 is rotatably connected to the movable frame 12 through the connecting part 323, the transmission part 321 is connected to the first back connecting rod 31 through the backrest fixing plate 34, and the support part 322 is connected to the fixing frame 11 through the third back connecting rod 33. When the movable frame 12 moves relative to the fixing frame 11, it helps the backrest assembly 3 to extend or retract in a certain order, so that the backrest plate 101 installed on the backrest fixing plate 34 is in a reclining or sitting position. When the backrest assembly 3 is in a sitting or TV position, the transmission part 321 abuts against the second limiting member 343, so that the backrest assembly 3 is stable in the sitting or TV position.

[0041] Reference Figure 3 and Figure 5 The leg support assembly 2 includes a first leg link 21, a second leg link 22, a third leg link 23, a fourth leg link 24, and a leg support mounting plate 25. One end of the first leg link 21 and one end of the second leg link 22 are rotatably connected to the movable frame 12, respectively. The other end of the first leg link 21 is rotatably connected to one end of the fourth leg link 24, and the other end of the second leg link 22 is rotatably connected to one end of the third leg link 23. The middle part of the first leg link 21 is rotatably connected to the middle part of the third leg link 23. The other ends of the third leg link 23 and the other ends of the fourth leg link 24 are rotatably connected to the leg support mounting plate 25, respectively. The two ends of the pusher 42 are fixedly connected to the first leg link 21 in the two leg support assemblies 2, respectively. The middle part of the second leg link 22 is connected to the assist assembly 5. When the drive rod 411 of the drive cylinder 41 extends, The pusher 42 pushes the first leg link 21, while the second leg link 22, with the assistance of the assist component 5, helps the leg support assembly 2 to extend first, realizing the adjustment from sitting posture to TV posture and lying posture. The third leg link 23 is provided with a third limiting member 231 for limiting the first leg link 21. The third limiting member 231 is located between the connection point of the second leg link 22 and the third leg link 23 and the rotation connection point between the middle of the first leg link 21 and the middle of the third leg link 23. After the leg support assembly 2 extends into the TV posture or lying posture, the first leg link 21 abuts against the third limiting member 231, which helps to stabilize the leg support assembly 2 in the TV posture or lying posture. It should be noted that the third limiting member 231 is also a shaft pin structure, which is fixed to the third leg link 23 by welding or screw fastening.

[0042] Reference Figure 5 and Figure 6 The pusher 42 includes a push rod 421. Two mounting ears 422 are provided at the middle of the push rod 421. Mounting ears 422 have mounting holes 4221 through which pins 43 pass. The pins 43 are rotatably connected to the drive rod 411 of the drive cylinder 41. In this embodiment, both ends of the push rod 421 are provided with fixing plates 4211, which are respectively fixedly connected to the two first leg connecting rods 21 by screws. In other embodiments of this application, both ends of the push rod 421 are directly welded to... On the two first leg connecting rods 21, the pusher 42 is connected to the first leg connecting rod 21 via the push rod 421. The pin 43 passes through the mounting holes 4221 on the two mounting ears 422 and is rotatably connected to the drive rod 411 of the drive cylinder 41. This helps to increase the torque between the drive rod 411 and the pusher 42, so that the drive rod 411 pushes the mounting ears 422 to drive the push rod 421 to rotate, and then the push rod 421 drives the first leg connecting rod 21 to rotate, which helps to realize the retraction or extension action of the leg support assembly 2.

[0043] Reference Figure 3 The assistive component 5 includes a first assistive rod 51, a second assistive rod 52, and an elastic element 53. The first assistive rod 51 is rotatably mounted on the movable frame 12. One end of the first assistive rod 51 is connected to one end of the elastic element 53, and the other end of the first assistive rod 51 is rotatably connected to one end of the second assistive rod 52. The other end of the elastic element 53 is connected to the fixed frame 11, and the other end of the second assistive rod 52 is rotatably connected to the middle of the second leg link 22. Under the action of the first assistive rod 51 and the second assistive rod 52, the elastic element 53 is stretched when the leg support component 2 is in the folded state, and is stretched when the leg support component 2 changes from a sitting position to a lying position. The elastic element 53, under the assistance of the rebound force, increases the extension force of the leg support assembly 2, which helps the leg support assembly 2 to extend first. When the backrest assembly 3 changes from a reclining position to a sitting position, the elastic element 53, which is in a stretched state, increases the sliding force of the moving frame 12 relative to the fixed frame 11 under the assistance of the rebound force, which helps the backrest assembly 3 to close first. With the assistance of the assist component 5, the posture adjustment is coordinated and smooth. The assist component 5, in conjunction with the drive cylinder 41, can replace the multi-power drive to adjust the posture. The elastic element 53 is a tension spring or rubber band, which has low manufacturing cost, simple structure, reliable operation, and can effectively reduce production and manufacturing costs.

[0044] Reference Figure 2 and Figure 7The slide rail component 13 includes a first slide rail 131 and a second slide rail 132. The first slide rail 131 is fixedly connected to the fixed frame 11 by fastening screws, and the second slide rail 132 is fixedly connected to the movable frame 12 by fastening screws. The first slide rail 131 and the second slide rail 132 are slidably connected by a rolling assembly 133, which helps to improve the reliability of the movable frame 12 sliding on the fixed frame 11. The first slide rail 131 includes a base plate 1311 and outer side plates 1312 extending vertically upward on both sides of the base plate 1311. The free ends of the outer side plates 1312 are bent inward to form upper rails 1313. The upper rails 1313 on both sides form openings 1314 to accommodate the second slide rail 132. The base plate 1311 is fixedly connected to the fixed frame 11. The second slide rail 132 includes a top rail disposed opposite to the base plate 1311. The top plate 1321 has two vertically downward extending inner side plates 1322 on both sides. The free ends of the inner side plates 1322 are bent outward to form a lower track 1323. The lower track 1323 is arranged at intervals relative to the upper track 1313. The rolling assembly 133 includes a first rolling element 1331, a second rolling element 1332, and a retainer 1333 for preventing the first rolling element 1331 and the second rolling element 1332 from disengaging. The first rolling element 1331 is disposed between the bottom plate 1311 and the top plate 1321, and the second rolling element 1332 is disposed between the upper track 1313 and the lower track 1323. The first rolling element 1331 and the second rolling element 1332 are installed in the retainer 1333, which helps to improve the stability and reliability of the sliding of the first slide rail 131 and the second slide rail 132.

[0045] This application also discloses a seat.

[0046] A type of seat, for reference Figure 8 The seat includes a seat posture adjustment device, a backrest 101 mounted on the backrest assembly 3, and a leg support 102 mounted on the leg support assembly 2. The seat posture adjustment device adopts a design combining a drive assembly 4 and an assist assembly 5, which realizes that the leg support 102 and the backrest 101 of the seat are linked and adjusted in a certain sequence, so that the seat posture adjustment action is coordinated, smooth, safe and reliable.

[0047] The working principle of a seat posture adjustment device is as follows: When the posture adjustment device is in a sitting position, both the leg support assembly 2 and the backrest assembly 3 are in a retracted state. The elastic element 53 of the assist assembly 5 is in a stretched state under the action of the first assist rod 51 and the second assist rod 52. When adjusting from a sitting position to a TV position, the drive cylinder 41 is energized, the drive rod 411 extends, and the drive rod 411 drives the push rod 421 to move and rotate simultaneously. The push rod 421 drives the first leg connecting rod 21 to move. At the same time, the first assist rod 51 and the second assist rod 52 move under the pulling force of the elastic element 53, and the elastic element 53 then retracts. The second assist rod 52 drives the second leg connecting rod 22 to move, the first leg connecting rod 21 drives the fourth leg connecting rod 24, and the second leg connecting rod 22 drives the third leg connecting rod 25. Leg link 23, third leg link 23, and fourth leg link 24 drive the leg support mounting plate 25 to extend. When the leg support mounting plate 25 is fully extended, the third limiting member 231 abuts against the first leg link 21, the drive cylinder 41 is de-energized, the drive rod 411 stops extending, and the posture adjustment device is in the TV position. When adjusting from the TV position to the lying position, the drive cylinder 41 is energized, the drive rod 411 continues to extend, the drive rod 411 drives the push rod 421 to move forward, the push rod 421 drives the first leg link 21 and the moving frame 12 to move forward as well, the moving frame 12 drives the first back link 31 to move forward as well, and the backrest fixing plate 34 extends backward into a lying position under the pull of the first back link 31, the second back link 32, and the third back link 33. When the first limiting member 342 abuts against the elastic member 53, the elastic member 53 is stretched under the pull of the fixed frame 11 and the first assist rod 51. The drive cylinder 41 is de-energized, and the drive rod 411 stops extending, adjusting the posture adjustment device to a reclining position. When the posture adjustment device is adjusted from a reclining position to a sitting position, the drive cylinder 41 is energized, and the drive rod 411 retracts. The drive rod 411 drives the push rod 421 to apply a backward pulling force to the first leg connecting rod 21 and the moving frame 12. Under the combined action of the elastic member 53's rebound force, the moving frame 12 slides backward, and the backrest fixing plate 34 is folded into a TV position under the pull of the first back connecting rod 31, the second back connecting rod 32, and the third back connecting rod 33. The second back connecting rod 32 abuts against the second limiting member 343, keeping the backrest assembly 3 in the folded state. When the TV posture is adjusted, the elastic element 53 retracts, and the drive rod 411 of the drive cylinder 41 continues to retract. The drive rod 411 drives the push rod 421 to rotate, driving the first leg connecting rod 21 to move backward. The first leg connecting rod 21 drives the second leg connecting rod 22, the third leg connecting rod 23, the third leg connecting rod 23, the fourth leg connecting rod 24, and the leg support mounting plate 25 to retract. Finally, the leg support mounting plate 25 is in the retracted position, the posture adjustment device is adjusted to the sitting position, the drive cylinder 41 is de-energized, the drive rod 411 stops retracting, and while the leg support assembly 2 is retracting, the second leg connecting rod 22 drives the second assist rod 52 to move. The second assist rod 52 drives the first assist rod 51 to rotate, thereby tightening the elastic element 53 and putting the elastic element 53 in a stretched state.

[0048] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A seat posture adjustment device, comprising a seat assembly (1), two leg support assemblies (2) connected to the front end of the seat assembly (1), and two backrest assemblies (3) connected to the rear end of the seat assembly (1), wherein the seat assembly (1) includes a fixed frame (11), two movable frames (12) arranged side by side, and a slide rail component (13), wherein the two movable frames (12) are slidably connected to the fixed frame (11) through the slide rail component (13), characterized in that: It also includes a drive assembly (4) for driving the two leg support assemblies (2) and the two backrest assemblies (3) to unfold or retract. The drive assembly (4) includes a drive cylinder (41) and a pusher (42) connected to the drive rod (411) of the drive cylinder (41). Both ends of the pusher (42) are connected to the two leg support assemblies (2). The drive cylinder (41) is rotatably connected to the fixed frame (11). It also includes an assist assembly (5) for assisting the two leg support assemblies (2) to unfold first or the two backrest assemblies (3) to retract first. The assist assembly (5) is mounted on the movable frame (12). One end of the assist assembly (5) is connected to the leg support assembly (2) and the other end is connected to the fixed frame (11).

2. The seat posture adjustment device according to claim 1, characterized in that: The backrest assembly (3) includes a first backrest link (31), a second backrest link (32), a third backrest link (33), and a backrest fixing plate (34). The first backrest link (31) and the second backrest link (32) are rotatably connected to the movable frame (12), and the third backrest link (33) is rotatably mounted on the fixing frame (11). One end of the second backrest link (32) is rotatably connected to the third backrest link (33), and the other end is rotatably connected to the backrest fixing plate (34). The first backrest link (31) is located away from the movable frame (12). One end is rotatably connected to the backrest fixing plate (34). A first limiting member (342) is provided on the backrest fixing plate (34) near the end connected to the first back connecting rod (31). When the seat posture is in a reclining position, the first limiting member (342) abuts against the first back connecting rod (31). A second limiting member (343) is provided on the backrest fixing plate (34) near the end connected to the second back connecting rod (32). When the seat posture is in a sitting or TV position, the second limiting member (343) abuts against the second back connecting rod (32).

3. The seat posture adjustment device according to claim 2, characterized in that: The second back link (32) includes a transmission part (321) and a support part (322) fixedly connected to the transmission part (321). The part where the transmission part (321) and the support part (322) are joined forms a joint part (323). The joint part (323) is rotatably connected to the movable frame (12). One end of the transmission part (321) away from the joint part (323) is rotatably connected to the backrest fixing plate (34). One end of the support part (322) away from the joint part (323) is rotatably connected to the third back link (33).

4. The seat posture adjustment device according to claim 3, characterized in that: The leg support assembly (2) includes a first leg link (21), a second leg link (22), a third leg link (23), a fourth leg link (24), and a leg support mounting plate (25). One end of the first leg link (21) and one end of the second leg link (22) are rotatably connected to the movable frame (12). The other end of the first leg link (21) is rotatably connected to one end of the fourth leg link (24). The other end of the second leg link (22) is rotatably connected to one end of the third leg link (23). The middle part of the first leg link (21) is rotatably connected to the middle part of the third leg link (23). The other end of the third leg link (23) is rotatably connected to the other end of the fourth leg link (24). The ends are rotatably connected to the leg support mounting plate (25); the two ends of the pusher (42) are fixedly connected to the first leg connecting rod (21) in the two leg support assemblies (2), the middle part of the second leg connecting rod (22) is connected to the assist assembly (5), and the third leg connecting rod (23) is provided with a third limiting member (231). The third limiting member (231) is located between the connection point of the second leg connecting rod (22) and the third leg connecting rod (23) and the rotatable connection point between the middle part of the first leg connecting rod (21) and the middle part of the third leg connecting rod (23). When the leg support assembly (2) is in the unfolded state, the first leg connecting rod (21) abuts against the third limiting member (231).

5. A seat posture adjustment device according to claim 4, characterized in that: The pusher (42) includes a push rod (421) and two mounting ears (422) located at the middle of the push rod (421). The mounting ears (422) are provided with mounting holes (4221), through which pins (43) pass. The pins (43) are rotatably connected to the drive rod (411) of the drive cylinder (41).

6. A seat posture adjustment device according to claim 5, characterized in that: The assist component (5) includes a first assist rod (51), a second assist rod (52), and an elastic element (53). The first assist rod (51) is rotatably mounted on the movable frame (12). One end of the first assist rod (51) is connected to one end of the elastic element (53), and the other end of the first assist rod (51) is rotatably connected to one end of the second assist rod (52). The end of the elastic element (53) away from the first assist rod (51) is connected to the fixed frame (11), and the end of the second assist rod (52) away from the first assist rod (51) is rotatably connected to the middle of the second leg connecting rod (22).

7. A seat posture adjustment device according to claim 6, characterized in that: The elastic element (53) is a tension spring or a rubber band.

8. A seat posture adjustment device according to claim 1, characterized in that: The slide rail component (13) includes a first slide rail (131) fixedly connected to the fixed frame (11) and a second slide rail (132) fixedly connected to the movable frame (12). The first slide rail (131) and the second slide rail (132) are slidably connected by a rolling assembly (133).

9. A seat posture adjustment device according to claim 8, characterized in that: The first slide rail (131) includes a base plate (1311), outer side plates (1312) extending vertically upward on both sides of the base plate (1311), the free ends of the outer side plates (1312) being bent inward to form upper rails (1313), the upper rails (1313) on both sides forming openings (1314) to accommodate the second slide rail (132), and the base plate (1311) being fixedly connected to the fixing frame (11); the second slide rail (132) includes a top plate (1321) disposed opposite to the base plate (1311), inner side plates (1322) extending vertically downward on both sides of the top plate (1321), the inner side plates (1322)... The free end of the plate (1322) is bent outward to form a lower track (1323), which is arranged at a distance from the upper track (1313). The rolling assembly (133) includes a first rolling element (1331), a second rolling element (1332), and a retainer (1333) for preventing the first rolling element (1331) and the second rolling element (1332) from separating. The first rolling element (1331) is disposed between the bottom plate (1311) and the top plate (1321), and the second rolling element (1332) is disposed between the upper track (1313) and the lower track (1323).

10. A type of seat, characterized in that: The seat posture adjustment device includes any one of claims 1 to 9, comprising a backrest plate (101) mounted on the backrest assembly (3) and a leg support plate (102) mounted on the leg support assembly (2).

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