Chair extension iron frame capable of achieving zero-gravity state

Abstract

Provided is a chair extension iron frame capable of achieving a zero-gravity state, the chair extension iron frame comprising: a support unit (1); a seat frame unit (2); a linkage mechanism (3), which is hinged between the seat frame unit (2) and the support unit (1); a backrest unit (4), which is connected to the seat frame unit (2); a footrest unit (5), which is hinged to the other end of the seat frame unit (2); and a limiting mechanism (6), which comprises a first stop member (61) and a second stop member (62), wherein the angle of the seat frame unit (2) changes by 5° to 20° between a reclined position and a seated position; the angle of the backrest unit (4) changes by 30° to 60° between the reclined position and the seated position, and the height of the footrest unit (5) changes by 200 mm to 450 mm between the reclined position and the seated position.

Description

A zero-gravity seat extension iron frame

[0001] Technical Field

[0002] This application relates to the field of sofa frame technology, and more particularly to a zero-gravity extendable seat frame. Background Technology

[0003] In modern home life, functional sofas, as a type of furniture that combines comfort, practicality, and aesthetics, have gained popularity among consumers. Sofas with rocking chair functions, in particular, offer a variety of sitting and reclining positions, further enhancing the user experience. However, traditional functional sofa frames, especially those designed as regular rocking chairs, rely primarily on motor drives and preset mechanical limit devices to fix and adjust the position when switching between sitting and reclining postures.

[0004] While this design meets users' basic needs for changing sofa positions to some extent, it still has limitations in terms of user experience. Specifically, traditional rocking chairs often lack a smooth transition and natural support when switching positions. Users may experience abrupt resistance or a sudden feeling of falling when transitioning from a sitting to a reclining position. This not only affects the overall comfort but also fails to fully demonstrate the advantages of ergonomic design.

[0005] More importantly, traditional rocking chairs fail to effectively simulate or achieve a so-called "zero-gravity" state when switching modes. Zero gravity refers to a state that simulates the feeling of complete relaxation and the absence of weightlessness in a space environment. This state has significant benefits for relieving physical stress, promoting blood circulation, and improving sleep quality. In high-end seating design, zero-gravity functionality has become one of the important indicators for measuring its comfort and health benefits. Summary of the Invention

[0006] To overcome at least one of the defects described in the prior art, this application provides a zero-gravity seat extension frame. This solves the abruptness of the transition process in traditional rocking chairs and sofas.

[0007] The technical solution adopted in this application to solve its problem is:

[0008] A zero-gravity seat extension frame includes: a support unit; a seat frame unit for attachment to a seat; a linkage mechanism hinged between the seat frame unit and the support unit, allowing the seat frame unit to swing freely above the support unit; a backrest unit connected to the seat frame unit; a footrest unit hinged to the other end of the seat frame unit; and a limiting mechanism including a first stop and a second stop for limiting the maximum extension of the frame in a reclining position. The angle of change of the seat frame unit between the reclining and sitting positions is 5°-20°; the angle of change of the backrest unit between the reclining and sitting positions is 30°-60°; and the height of the footrest unit between the reclining and sitting positions is 200mm-450mm.

[0009] By adopting the above solution, the coordinated action of the backrest unit and the footrest unit can simulate a zero-gravity state like a space capsule, allowing users to feel relaxed all over and without obvious gravitational pressure when lying down. At the same time, the limitation of angle changes ensures that users can feel comfortable and stable when switching states, avoiding the abruptness or discomfort that may occur in traditional designs. The setting of the first and second stops not only limits the maximum extension of the iron frame in the lying position, but also ensures the stability and safety of the entire extension process, thus contributing to the smoothness of state switching.

[0010] In some embodiments, the linkage mechanism includes: a front swing unit, which includes a front swing main rod, a front swing connecting rod, and a front swing stop; one end of the front swing main rod is hinged to the seat frame unit, one end of the front swing connecting rod is hinged to the foot rest unit, and the front swing stop is hinged to the support unit; and a rear swing unit, which includes a rear swing main rod and a rear swing stop; one end of the rear swing main rod is hinged to the seat frame unit, and the other end is hinged to the other end of the front swing main rod; one end of the rear swing stop is hinged to the support unit, and the other end is hinged to the front swing main rod.

[0011] By adopting the above solution, a smooth transition between sitting and reclining positions of the seat frame unit is ensured, thereby achieving synchronous adjustment of the backrest unit and footrest unit, while ensuring the stability and safety of the seat during extension.

[0012] In some embodiments, the front swing link includes: a first link, one end of which is hinged to the footrest unit; a second link, which includes a first connection point, a second connection point, a third connection point, and a fourth connection point from one end to the other, a first stop at the first connection point for abutting against the rear side of the front swing stop in a lying position, the second connection point being hinged to the other end of the first link, and the third connection point being hinged to the front swing main rod; a third link, one end of which is hinged to the fourth connection point, and a second stop at the other end of which abuts against the front side of the rear swing stop in a lying position; and a fourth link, one end of which is hinged to the front swing main rod, and the other end having a fourth link groove in which the second stop slides.

[0013] By adopting the above scheme, precise control and coordinated movement between the front swing link, the front swing main rod, the footrest unit, and the front swing stop are achieved; the third link enhances the stability and safety of the seat during extension through the interaction between its second stop and the rear swing stop; similarly, the fourth link provides a flexible adjustment space for the second stop through its groove design, allowing the seat to transition more smoothly during extension.

[0014] In some embodiments, a sliding mechanism is provided on the rear side of the rear swing main rod, the sliding mechanism is provided with a sliding groove, and the backrest unit is provided with a first connecting part that slides in the sliding groove.

[0015] By adopting the above scheme, the sliding mechanism is allowed to slide to a certain extent on the rear swing main rod, so that the backrest unit can be adjusted accordingly with the movement of the rear swing main rod, while maintaining a stable connection with the rear swing main rod.

[0016] In some embodiments, the foot rest unit includes: a linkage assembly comprising a fifth link, a sixth link, a seventh link, and an eighth link, wherein the rear end of the fifth link is hinged to the seat frame unit, the rear end of the eighth link is hinged to the front end of the fifth link, the rear end of the seventh link is hinged to the seat frame unit, the rear end of the sixth link is hinged to the front end of the seventh link, and the middle portion of the sixth link is hinged to the middle portion of the fifth link; a first foot rest, one end of which is hinged to the front end of the sixth link; a linkage rod, one end of which is hinged to the eighth link, and the other end of which is hinged to the other end of the first foot rest; a second foot rest, the second foot rest being hinged to the front end of the eighth link; and a foot rest connector, the front end of which is hinged to the second foot rest, and the rear end of which is hinged to the eighth link.

[0017] By adopting the above solution, the footrest unit can be adjusted accordingly with the overall movement of the seat, thereby ensuring that the user can feel a smooth transition when switching between sitting and reclining positions, while maintaining good stability and safety during the extension process.

[0018] In some embodiments, the support unit includes: a first leg; a second leg; a first leg crossbar connected between the front end of the first leg and the front end of the second leg; a second leg crossbar connected between the rear end of the first leg and the rear end of the second leg; a first support plate fixed to the first leg for hinged connection with the linkage mechanism; and a second support plate fixed to the second leg for hinged connection with the linkage mechanism.

[0019] By adopting the above scheme, the components together constitute the main structure of the support unit, ensuring effective load-bearing of the seat and user's weight, and maintaining good stability during the extension process. The connection between the first and second leg crossbars enhances the overall structural strength of the support unit, making it more stable and reliable. The design of the first and second support plates takes into account the connection method with the linkage mechanism and the load-bearing requirements, providing additional support and stability for the extension process of the seat.

[0020] In some embodiments, the seat frame unit, footrest unit, backrest unit, limiting mechanism, and linkage mechanism are each provided in two sets. A backrest synchronizing rod is provided between the two sets of backrest units, a footrest synchronizing rod is provided between the two sets of footrest units, a first linkage synchronizing rod is provided between the rear swing main rods of the two sets of limiting mechanisms, and a second linkage synchronizing rod is provided between the front swing stops of the two sets of limiting mechanisms.

[0021] By adopting the above solutions, it is ensured that the two sets of backrest units can maintain synchronous movement when adjusting the backrest angle; that the two sets of footrest units can maintain synchronous movement when unfolding and retracting the footrests; that the two sets of rear swing main rods can maintain synchronous movement when adjusting the seat back swing angle, avoiding the problem of the seat swaying left and right; and that the two sets of front swing stops can maintain synchronous movement when adjusting the seat front swing angle, maintaining the stability of the seat. Overall, this ensures that both sides of the seat can provide balanced support and load-bearing capacity, avoiding the problem of unilateral overload or imbalance.

[0022] In some embodiments, the linkage mechanism is also connected to a drive module to switch the iron frame between the sitting position and the lying position.

[0023] By adopting the above solution, the drive module can more accurately and intelligently enable the zero-gravity seat to extend its frame and switch between sitting and reclining positions.

[0024] In some embodiments, the drive module includes a first drive member and a second drive member, the first drive member being hinged between the backrest synchronizing rod and the first linkage synchronizing rod, and the second drive member being hinged between the footrest synchronizing rod and the first linkage synchronizing rod.

[0025] By adopting the above solution, dual drive can achieve more precise and stable control over the zero-gravity seat extension frame, ensuring the safety and reliability of the user during the adjustment process.

[0026] In some embodiments, the first driving element is a slider motor or a push rod motor, and the second driving element is a slider motor or a push rod motor.

[0027] By adopting the above solution, precise control of the seat can be achieved with a fast response speed.

[0028] In summary, the zero-gravity seat extension frame provided in this application has the following technical advantages:

[0029] 1. Through the coordinated movement of the backrest and footrest units, the zero-gravity seat's extended frame can simulate a zero-gravity state similar to that of a space capsule. This design allows users to feel completely relaxed and without noticeable gravitational pressure when lying down, thus greatly improving user comfort and experience.

[0030] 2. Ensures a smooth transition from sitting to reclining posture. By precisely controlling the angle changes of the backrest and footrest units, the abruptness or discomfort that may occur in traditional designs is avoided. At the same time, the stable support structure ensures the user's safety and stability when switching positions;

[0031] 3. Through the design of the first and second stops, this zero-gravity seat extension frame not only limits the maximum extension of the frame in a reclining position but also ensures stability and safety throughout the extension process. This helps prevent damage or malfunction caused by over-extension or improper use, thereby extending the seat's lifespan. Attached Figure Description

[0032] Figure 1 is a three-dimensional structural diagram of the sitting posture according to an embodiment of this application;

[0033] Figure 2 is a side view of the seated structure according to an embodiment of this application;

[0034] Figure 3 is a three-dimensional structural diagram of the lying posture according to an embodiment of this application;

[0035] Figure 4 is a side view of the lying posture structure according to an embodiment of this application;

[0036] Figure 5 is a schematic diagram of the abutment structure of the limiting mechanism in an embodiment of this application;

[0037] Figure 6 is a schematic diagram of the supine structure in the lying position according to an embodiment of this application.

[0038] The meanings of the reference numerals in the attached drawings are as follows: 1. Support unit; 11. First leg; 12. Second leg; 13. First leg crossbar; 14. Second leg crossbar; 15. First support plate; 16. Second support plate; 2. Seat frame unit; 3. Linkage mechanism; 31. Front swing unit; 311. Front swing main rod; 312. Front swing stop; 32. Rear swing unit; 321. Rear swing main rod; 322. Rear swing stop; 323. Sliding mechanism; 3231. Sliding groove; 33. Front swing connecting rod; 331. First connecting rod; 332. Second connecting rod; 3321. First connection point; 3322. Second connection point; 3323. Third connection point; 3324. Fourth connection point; 333, Third Link; 334, Fourth Link; 3341, Fourth Link Slide; 4, Backrest Unit; 41, First Hinge Point; 42, First Connecting Part; 5, Footrest Unit; 51, Link Assembly; 511, Fifth Link; 512, Sixth Link; 513, Seventh Link; 514, Eighth Link; 52, First Footrest; 53, Linkage Rod; 54, Second Footrest; 55, Footrest Connector; 6, Limiting Mechanism; 61, First Stop; 62, Second Stop; 7, Backrest Synchronizing Rod; 8, Footrest Synchronizing Rod; 9, First Linkage Synchronizing Rod; 10, Second Linkage Synchronizing Rod; 20, Drive Module; 201, First Drive Component; 202, Second Drive Component. Embodiments of the present invention

[0039] In the description of this application, it should be noted that the terms "upper", "lower", "front", "back", "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 used only for the convenience of describing this application 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 limitations on this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0041] Embodiment 1 of this application, as shown in Figures 1-6, discloses a zero-gravity seat extension frame, including a support unit 1, a seat frame unit 2, a backrest unit 4, a linkage mechanism 3, a footrest unit 5, and a limiting mechanism 6. The seat frame unit 2 is attached to the seat, the support unit 1 supports the frame on the ground, the backrest unit 4 is attached to the backrest cushion, and the footrest unit 5 is attached to the foot pad. The linkage mechanism 3 is hinged between the seat frame unit 2 and the support unit 1, allowing the seat frame unit 2 to swing movably above the support unit 1. The backrest unit 4 and the seat frame unit 5 are connected. Specifically, the backrest unit 4 includes a first hinge point 41 hinged to one end of the seat frame unit 2 and a first connecting part 42 movably connected to the linkage mechanism 3. In some embodiments, the first connecting part 42 is provided with a roller structure or roller structure rotatably connected to the backrest unit 4. The footrest unit 5 is hinged to the other end of the seat frame unit 2. The limiting mechanism 6 includes a first stop 61 and a second stop 62, used to limit the maximum extension of the iron frame in the lying position. In some embodiments, the seat frame unit 2 can also be fixedly connected to the linkage mechanism 3. The seat frame unit 2 has an angle of change of 5°-20° between the reclining and sitting positions; the backrest unit 4 has an angle of change of 30°-60° between the reclining and sitting positions; and the footrest unit 5 has a height change of 200mm-450mm between the reclining and sitting positions. In some embodiments, the seat frame unit 2 has an angle of change of 10° between the reclining and sitting positions, the backrest unit 4 has an angle of change of 44° between the reclining and sitting positions, the footrest unit 5 has a height of 562mm in the reclining position, and the footrest unit 5 has a height of 258mm in the sitting position. Therefore, the height change of the footrest unit 5 between the reclining and sitting positions is 304mm. Through the coordinated action of the backrest unit 4 and the footrest unit 5, a zero-gravity state similar to that of a space capsule can be simulated, allowing users to feel relaxed all over and without obvious gravitational pressure when lying down. At the same time, the limitation of angle changes ensures that users can feel comfortable and stable when switching states, avoiding the abruptness or discomfort that may occur in traditional designs. The setting of the first stop 61 and the second stop 62 not only limits the maximum extension of the iron frame in the lying position, but also ensures the stability and safety of the entire extension process, thus contributing to the smoothness of state switching.

[0042] In some embodiments, the linkage mechanism 3 includes a front swing unit 31 and a rear swing unit 32 for controlling the back-and-forth swing of the seat frame unit 2. Specifically, the front swing unit 31 includes a front swing main rod 311, a front swing connecting rod 33, and a front swing stop 312. One end of the front swing main rod 311 is hinged to the seat frame unit 2, one end of the front swing connecting rod 33 is hinged to the footrest unit 5, and the front swing stop 312 is hinged to the support unit 1. The rear swing unit 32 includes a rear swing main rod 311... The rear swing arm 321 and the rear swing stop 322 are connected to each other. One end of the rear swing arm 321 is hinged to the seat frame unit 2 and the other end is hinged to the other end of the front swing arm 311. One end of the rear swing stop 322 is hinged to the support unit 1 and the other end is hinged to the front swing arm 311. This ensures a smooth transition between the seat frame unit 2 and the reclining position, thereby achieving synchronous adjustment of the backrest unit 4 and the footrest unit 5, and ensuring the stability and safety of the seat during the extension process. In some embodiments, the front swing link 33 includes a first link 331, a second link 332, a third link 333, and a fourth link 334. One end of the first link 331 is hinged to the footrest unit 5. The second link 332 includes a first connection point 3321, a second connection point 3322, a third connection point 3323, and a fourth connection point 3324 from one end to the other. The first stop 61 is disposed at the first connection point 3321. In some embodiments, the first stop 61 is a roller structure rotatably connected to the first connection point 3321. The first stop 61 is used to abut against the rear side of the front swing stop 312 in the lying position. The contact point 3322 is hinged to the other end of the first connecting rod 331, the third connecting point 3323 is hinged to the front swing main rod 311, one end of the third connecting rod 333 is hinged to the fourth connecting point 3324, the second stop 62 is provided at the other end of the third connecting rod 333, the second stop 62 is used to abut against the front side of the rear swing stop 322 in the lying position, in some embodiments, the second stop 62 is a roller structure rotatably connected to the third connecting rod 333; one end of the fourth connecting rod 334 is hinged to the front swing main rod 311, and the other end is provided with a fourth connecting rod groove 3341, the second stop 62 is slidably disposed in the fourth connecting rod groove 3341. This configuration enables precise control and coordinated movement between the front swing link 33, the front swing main rod 311, the footrest unit 5, and the front swing stop 312. The third link 333, through the interaction between its second stop 62 and the rear swing stop 322, enhances the stability and safety of the seat during extension. Similarly, the fourth link 334, through its groove design, provides a flexible adjustment space for the second stop 62, allowing the seat to transition more smoothly during extension.

[0043] It should be noted that in other embodiments, the shape and number of the front swing linkage 33 are not specifically limited, as long as a stable linkage effect can be achieved and a zero-gravity effect is satisfied.

[0044] In some embodiments, a sliding mechanism 323 is provided on the rear side of the rear swing main rod 321. The sliding mechanism 323 has a sliding groove 3231, and the pulley structure or roller structure of the first connecting part 42 slides within the sliding groove 3231. This arrangement allows the sliding mechanism 323 to slide to a certain extent on the rear swing main rod 321, enabling the backrest unit 4 to adjust accordingly with the movement of the rear swing main rod 321 while maintaining a stable connection with it. In some embodiments, the sliding mechanism 323 has a fan-shaped structure, and the sliding groove 3231 is also fan-shaped. This allows the first connecting part 42 to rotate around the first hinge point 41, while the rotation range is limited by the range of the sliding groove 3231. In some embodiments, the rear swing main rod 321 and the sliding mechanism 323 are, but not limited to, integrally formed, welded, bonded, or snap-fitted connections. In other embodiments, the sliding mechanism 323 and the first connecting part 42 may also be a groove and a protrusion structure, as long as the curved surface sliding effect can be achieved. This embodiment does not make specific limitations.

[0045] In some embodiments, the foot rest unit 5 includes a linkage assembly 51, a first foot rest 52, a second foot rest 54, a foot rest connector 55, and a linkage rod 53. The linkage assembly 51 includes a fifth link 511, a sixth link 512, a seventh link 513, and an eighth link 514. The rear end of the fifth link 511 is hinged to the seat frame unit 2, the rear end of the eighth link 514 is hinged to the front end of the fifth link 511, the rear end of the seventh link 513 is hinged to the seat frame unit 2, and the rear end of the sixth link 512... The first footrest 52 is hinged to the front end of the seventh link 513, the middle part of the sixth link 512 is hinged to the middle part of the fifth link 511, one end of the first footrest 52 is hinged to the front end of the sixth link 512, one end of the linkage 53 is hinged to the eighth link 514, and the other end is hinged to the other end of the first footrest 52, the second footrest 54 is hinged to the front end of the eighth link 514, the front end of the footrest connector 55 is hinged to the second footrest 54, and the rear end of the footrest connector 55 is hinged to the eighth link 514. In some embodiments, the footrest connector 55 consists of two mutually hinged links; in other embodiments, the specific structure and number of links of the footrest connector 55 are not specified. This configuration allows the footrest unit 5 to adjust accordingly with the overall movement of the seat, ensuring a smooth transition when switching between sitting and reclining positions, while maintaining good stability and safety during extension. In other embodiments, the foot support unit 5 may only include the first foot support 52 and the connecting rod assembly 51. The goal is simply to achieve the extension effect of the iron frame legs.

[0046] In some embodiments, to provide stable support for the iron frame, the support unit 1 includes a first leg 11, a second leg 12, a first leg crossbar 13, a second leg crossbar 14, a first support plate 15, and a second support plate 16. The first leg crossbar 13 is connected between the front end of the first leg 11 and the front end of the second leg 12, and the second leg crossbar 14 is connected between the rear end of the first leg 11 and the rear end of the second leg 12. The first support plate 15 is fixed to the first leg 11 for hinged connection with the linkage mechanism 3, and the second support plate 16 is fixed to the second leg 12 for hinged connection with the linkage mechanism 3. In some embodiments, the first leg 12 is connected to the second leg 12 for hinged connection with the linkage mechanism 3. The first leg 11, second leg 12, first leg crossbar 13, second leg crossbar 14, first support plate 15, and second support plate 16 are connected, but are not limited to, integrally joined, welded, bonded, or screwed together. This embodiment does not impose specific limitations. With this configuration, the components together constitute the main structure of the support unit 1, ensuring effective load-bearing of the seat and user's weight and maintaining good stability during extension. The connection between the first leg crossbar 13 and the second leg crossbar 14 enhances the overall structural strength of the support unit 1, making it more stable and reliable. The design of the first support plate 15 and the second support plate 16 takes into account the connection method with the linkage mechanism 3 and the load-bearing requirements, providing additional support and stability for the seat's extension process. In other embodiments, the structure of the support unit 1 is not specifically limited, as long as it provides stable support.

[0047] To improve the stability of the iron frame extension and retraction, the seat frame unit 2, foot rest unit 5, backrest unit 4, limiting mechanism 6 and linkage mechanism 3 are each provided in two sets. In some embodiments, a backrest synchronization rod 7 is provided between the two sets of backrest units 4, a foot rest synchronization rod 8 is provided between the two sets of foot rest units 5, a first linkage synchronization rod 9 is provided between the rear swing main rods 321 of the two sets of limiting mechanisms 6, and a second linkage synchronization rod 10 is provided between the front swing stops 312 of the two sets of limiting mechanisms 6. To ensure that the two sets of backrest units 4 move synchronously when adjusting the backrest angle; to ensure that the two sets of footrest units 5 move synchronously when unfolding and retracting the footrests; to ensure that the two sets of rear swing main rods 321 move synchronously when adjusting the seat rear swing angle, thus preventing the seat from swaying left and right; and to ensure that the two sets of front swing stops 312 move synchronously when adjusting the seat front swing angle, thus maintaining the stability of the seat. Overall, this ensures that both sides of the seat can provide balanced support and load-bearing capacity, avoiding unilateral overload or imbalance. In other embodiments, the position and number of synchronizing rods are not limited, as long as synchronous driving effect can be achieved.

[0048] In some embodiments, to achieve intelligent switching of the steel frame between two states, the linkage mechanism 3 is also connected to a drive module 20, enabling the steel frame to switch between the sitting and reclining states. The drive module 20 can more accurately and intelligently switch the zero-gravity seat extension steel frame between the sitting and reclining states, making it more intelligent and convenient. In some embodiments, the drive module 20 includes a first drive component 201 and a second drive component 202. The first drive component 201 is hinged between the backrest synchronization rod 7 and the first linkage synchronization rod 9, and the second drive component 202 is hinged between the footrest synchronization rod 8 and the first linkage synchronization rod 9. The dual drive enables more precise and stable control of the zero-gravity seat extension steel frame, ensuring the safety and reliability of the user during the adjustment process.

[0049] In some embodiments, the first driving component 201 is a slider motor or a push rod motor, and the second driving component 202 is a slider motor or a push rod motor. Of course, other motor structures can also be used; this embodiment does not impose specific limitations. In some embodiments, the first driving component 201 is a push rod motor, and the second driving motor is a slider motor, which enables precise control of the seat and provides a fast response speed.

[0050] When the iron frame changes from a sitting position to a reclining position, the first drive component 201 and the second drive component 202 work simultaneously. The push rod motor of the first drive component 201 retracts, pulling the backrest synchronization rod 7 to rotate. At this time, the first connecting part 42 of the backrest unit 4 slides downward along the sliding groove 3231 to make the backrest unit 4 lie flat. The second slider motor of the second drive component 202 provides the footrest synchronization rod 8 to move away from the first linkage synchronization rod 9, thereby raising and extending the footrest unit 5. When the first stop 61 in the linkage mechanism 3 abuts against the rear side of the front swing stop 312, and the second stop 62 abuts against the front side of the rear swing stop 322, the reclining position change is completed. The state transition process can achieve a zero-gravity effect and is stable and safe.

[0051] In summary, the zero-gravity seat extension frame provided in this application has the following technical advantages:

[0052] 1. Through the coordinated action of the backrest unit 4 and the footrest unit 5, the zero-gravity seat's extended frame can simulate a zero-gravity state similar to that of a space capsule. This design allows users to feel completely relaxed and without noticeable gravitational pressure when lying down, thus greatly improving user comfort and experience.

[0053] 2. Ensures a smooth transition from sitting to reclining posture. By precisely controlling the angle changes of the backrest unit 4 and footrest unit 5, the abruptness or discomfort that may occur in traditional designs is avoided. At the same time, the stable support structure ensures the user's safety and stability when switching positions;

[0054] 3. Through the setting of the first stop 61 and the second stop 62, the zero-gravity seat extension frame not only limits the maximum extension of the frame in the reclining position, but also ensures the stability and safety of the entire extension process. This helps prevent damage or malfunction caused by over-extension or improper use, thereby extending the service life of the seat.

Claims

1. A zero-gravity seat extension frame, comprising: Support unit (1); Seat frame unit (2), the seat frame unit (2) being used to attach to the seat; Linkage mechanism (3), which is hinged between the seat frame unit (2) and the support unit (1), so that the seat frame unit (2) can swing movably above the support unit (1); Backrest unit (4), which is connected to the seat frame unit (2); A foot support unit (5) is hinged to the other end of the seat frame unit (2); The limiting mechanism (6) includes a first stop (61) and a second stop (62) for limiting the maximum extension of the iron frame in the lying position; The seat frame unit (2) has an angle of change of 5°-20° between the lying and sitting positions; the backrest unit (4) has an angle of change of 30°-60° between the lying and sitting positions; and the footrest unit (5) has a height change of 200mm-450mm between the lying and sitting positions.

2. The zero-gravity seat extension frame according to claim 1, wherein, The linkage mechanism (3) includes: The front swing unit (31) includes a front swing main rod (311), a front swing connecting rod (33) and a front swing stop (312). One end of the front swing main rod (311) is hinged to the seat frame unit (2), one end of the front swing connecting rod (33) is hinged to the foot rest unit (5), and the front swing stop (312) is hinged to the support unit (1). The rear swing unit (32) includes a rear swing main rod (321) and a rear swing stop (322). One end of the rear swing main rod (321) is hinged to the seat frame unit (2), and the other end is hinged to the other end of the front swing main rod (311). One end of the rear swing stop (322) is hinged to the support unit (1), and the other end is hinged to the front swing main rod (311).

3. A zero-gravity seat extension frame according to claim 2, wherein, The front swing link (33) includes: The first link (331) is hinged at one end to the foot support unit (5); The second link (332) includes a first connection point (3321), a second connection point (3322), a third connection point (3323) and a fourth connection point (3324) from one end to the other. The first stop (61) is located at the first connection point (3321) and is used to abut against the rear side of the front swing stop (312) in the lying position. The second connection point (3322) is hinged to the other end of the first link (331), and the third connection point (3323) is hinged to the front swing main rod (311). The third link (333) is hinged at one end to the fourth connection point (3324), and the second stop (62) is provided at the other end of the third link (333). The second stop (62) is used to abut against the front side of the rear swing stop (322) in the lying position. The fourth link (334) is hinged at one end to the front swing main rod (311) and the other end is provided with a fourth link slide groove (3341). The second stop (62) is slidably disposed in the fourth link slide groove (3341).

4. A zero-gravity seat extension frame according to claim 2, wherein, The rear side of the rear swing main rod (321) is provided with a sliding mechanism (323), the sliding mechanism (323) is provided with a sliding groove (3231), and the backrest unit (4) is provided with a first connecting part (42) that slides in the sliding groove (3231).

5. A zero-gravity seat extension frame according to claim 1, wherein, The foot support unit (5) includes: Linkage assembly (51), the linkage assembly (51) includes a fifth link (511), a sixth link (512), a seventh link (513) and an eighth link (514), the rear end of the fifth link (511) is hinged to the seat frame unit (2), the rear end of the eighth link (514) is hinged to the front end of the fifth link (511), the rear end of the seventh link (513) is hinged to the seat frame unit (2), the rear end of the sixth link (512) is hinged to the front end of the seventh link (513), and the middle part of the sixth link (512) is hinged to the middle part of the fifth link (511); The first foot rest (52) is hinged at one end to the front end of the sixth link (512); Linkage rod (53), one end of which is hinged to the eighth link (514), and the other end is hinged to the other end of the first foot rest (52); The second foot (54) is hinged to the front end of the eighth link (514); The foot support connector (55) is hinged at its front end to the second foot support (54) and at its rear end to the eighth link (514).

6. A zero-gravity seat extension frame according to claim 1, wherein, The support unit (1) includes: First tripod (11); Second tripod (12); The first tripod crossbar (13) is connected between the front end of the first tripod (11) and the front end of the second tripod (12); The second tripod crossbar (14) is connected between the rear end of the first tripod (11) and the rear end of the second tripod (12); The first support plate (15) is fixed on the first leg (11) and is used to hinge with the linkage mechanism (3); The second support plate (16) is fixed on the second leg (12) and is used to hinge with the linkage mechanism (3).

7. A zero-gravity seat extension frame according to any one of claims 1-6, wherein, The seat frame unit (2), footrest unit (5), backrest unit (4), limiting mechanism (6) and linkage mechanism (3) are each provided in two sets. A backrest synchronizing rod (7) is provided between the two sets of backrest units (4), a footrest synchronizing rod (8) is provided between the two sets of footrest units (5), a first linkage synchronizing rod (9) is provided between the rear swing main rods (321) of the two sets of limiting mechanisms (6), and a second linkage synchronizing rod (10) is provided between the front swing stop (312) of the two sets of limiting mechanisms (6).

8. A zero-gravity seat extension frame according to claim 7, wherein, The linkage mechanism (3) is also connected to a drive module (20) to enable the iron frame to switch between the sitting position and the lying position.

9. A zero-gravity seat extension frame according to claim 8, wherein, The drive module (20) includes a first drive member (201) and a second drive member (202). The first drive member (201) is hinged between the backrest synchronizing rod (7) and the first linkage synchronizing rod (9), and the second drive member (202) is hinged between the footrest synchronizing rod (8) and the first linkage synchronizing rod (9).

10. A zero-gravity seat extension frame according to claim 9, wherein, The first driving component (201) is a slider motor or a push rod motor, and the second driving component (202) is a slider motor or a push rod motor.

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