Seat frame and seat

Abstract

The invention discloses a seat frame and a seat, and relates to the technical field of seats, the seat frame comprises a base, a seat frame mechanism, a swing assembly, a leg telescoping mechanism, a first locking structure and a second locking structure; the seat frame mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod; the swing assembly comprises a first swing rod and a second swing rod. The rotation of the first swing rod is limited through the second locking structure, and the angle of the leg support is adjusted on the premise of keeping the angle of the cushion unchanged through the rotation of the third connecting rod and the fourth connecting rod, so that the conversion of the seat frame between the TV posture state and the sitting posture state is realized; rotation of a third connecting rod is limited through a first locking structure, and through rotation of a first swing rod and a second swing rod, the angle of a seat cushion is adjusted on the premise that the angle of a leg support is kept unchanged, and then conversion of the seat frame between a TV posture state and a lying posture state is achieved; therefore, the sitting frame can be switched among the sitting posture state, the TV posture state and the lying posture state.

Description

Technical Field

[0001] This invention belongs to the technical field of seating, and specifically relates to a seat frame and seating. Background Technology

[0002] When the seat is in the TV position, the seat cushion maintains the angle of a normal sitting posture, and the backrest remains at the same angle or is slightly reclined. Simultaneously, the leg rest extends and lifts, supporting the user's lower limbs while ensuring the ankles hang naturally. This TV position effectively reduces pressure on the lumbar intervertebral discs, decreases the risk of lower limb venous congestion compared to the traditional sitting posture, and improves the biomechanical balance of the spine in the sagittal plane, thus reducing the incidence of lower back pain.

[0003] Many related technologies for seating suffer from limited functionality, only allowing for two basic postures: sitting and reclining. When transitioning from a sitting to a reclining position, the leg rest height adjustment mechanism and the seat cushion angle adjustment mechanism form a rigid linkage, lacking independent control. This design limitation prevents the seating system from achieving a TV-like posture, restricting the user's diverse needs for rest postures. Summary of the Invention

[0004] The purpose of this invention is to provide a seat that can switch between a sitting position, a TV position, and a reclining position.

[0005] The present invention also provides a seating device.

[0006] The technical solution adopted to solve the above-mentioned technical problems is as follows: A seat frame provided in a first aspect embodiment of the present invention includes: Base; The seat frame mechanism includes a first link, a second link, a third link, and a fourth link; one end of the third link is rotatably connected to the first link, and the other end is rotatably connected to the second link; one end of the fourth link is rotatably connected to the first link, and the other end is rotatably connected to the second link; the first link is located above the second link, and the first link is used to mount the seat cushion; The swing assembly includes a first swing rod and a second swing rod. One end of the first swing rod is rotatably connected to the second connecting rod, and the other end is rotatably connected to the base. One end of the second swing rod is rotatably connected to the second connecting rod, and the other end is rotatably connected to the base. Leg extension mechanism; A rotating rod is rotatably connected to the third link and the leg extension mechanism; the third link and the rotating rod rotate synchronously to enable the leg extension mechanism to perform extension and retraction movements. A first locking structure, one end of which is rotatably connected to the third link and the other end of which is rotatably connected to the second link; The second locking structure has one end rotatably connected to the first swing rod and the other end rotatably connected to the second connecting rod; The seat frame has a sitting position, a TV position, and a reclining position. During the switching between the sitting position and the TV position, the third link and the fourth link rotate synchronously, and the second locking structure restricts the rotation of the first swing rod relative to the second link. During the switching between the TV position and the reclining position, the first swing rod rotates relative to the second link, and the first locking structure restricts the rotation of the third link relative to the second link.

[0007] A second aspect of the present invention provides a seating arrangement comprising the seat frame described in any of the embodiments of the first aspect.

[0008] The present invention has at least the following beneficial effects: The seat frame mechanism is used to install the seat cushion, and the leg extension mechanism is used to install the leg rest. A second locking structure restricts the rotation of the first swing rod, and the rotation of the third and fourth links allows the angle of the leg rest to be adjusted while maintaining the seat cushion angle, thus enabling the seat frame to switch between a TV posture and a sitting posture. A first locking structure restricts the rotation of the third link, and the rotation of the first and second swing rods allows the angle of the seat cushion to be adjusted while maintaining the leg rest angle, thus enabling the seat frame to switch between a TV posture and a reclining posture. Therefore, the seat frame can switch between sitting, TV, and reclining postures. Attached Figure Description

[0009] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the seat frame provided in the embodiment of the present invention in a seated position; Figure 2 This is a schematic diagram of the seat frame in the TV posture state provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the seat frame provided in the embodiment of the present invention in a reclining position; Figure 4 This is a schematic diagram of the seat frame in the TV posture state provided in an embodiment of the present invention; Figure 5 yes Figure 4 Enlarged view of the structure at point A in the middle; Figure 6 yes Figure 4 Enlarged view of the structure at point B; Figure 7 This is a schematic diagram of the structure of the first support rod of the seat frame provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the seat frame mechanism of the seat frame provided in an embodiment of the present invention; Figure 9 This is a schematic diagram showing the cooperation relationship between the base, the first swing rod, the second swing rod, and the second connecting rod of the seat frame provided in the embodiment of the present invention; Figure 10 This is a schematic diagram showing the cooperation relationship between the base, the first swing rod, the second swing rod, and the seat frame mechanism of the seat frame provided in the embodiment of the present invention.

[0010] The following labels are shown in the attached diagram: 100. Base; 200. Seat frame mechanism; 210. First connecting rod; 211. Second limiting rod; 212. Third limiting rod; 213. Reinforcing rib; 220. Second connecting rod; 221. Lateral section; 222. Inclined section; 223. Fifth limiting rod; 224. Fixed rod; 230. Third connecting rod; 231. Fourth limiting rod; 240. Fourth connecting rod; 250. First hinge point; 260. Second hinge point; 270. First connection point; 280. Second connection point; 290. Seat cushion mounting component; 291. First mounting plate; 292. Second mounting plate; 310. First swing arm; 311. First limit arm; 320. Second swing arm; 400. Leg extension mechanism; 410. Rotating rod; 510. First locking structure; 511. First locking segment; 512. First mating segment; 5121. First mating part; 513. Third intersection; 514. First elastic element; 520. Second locking structure; 521. Second locking segment; 522. Second mating segment; 5221. Second mating part; 5222. Abutment surface; 523. Fourth intersection; 524. Second elastic element; 530. First rod; 540. Second rod; 550. First intersection; 560. Second intersection; 600. Drive component; 610. Connecting component; 700. Back support assembly; 710. Back mounting component; 720. First support rod; 721. Clearance part; 7211. Clearance hole; 723. Rotation point; 730. Second support rod; 800. Linkage component; 810. First linkage rod; 820. Second linkage rod; 821. Rotating shaft; 822. First support rod; 823. Second support rod; 830. Third linkage rod; 900. Anti-tilt component; 910. Abutment rod; 920. Connecting rod; 930. Pulley; X, the first connection; Y, the second connection; c. First direction; d. Second direction; e. Third direction; f. Fourth direction. Detailed Implementation

[0011] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0012] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0013] In the description of this invention, the use of terms such as "a number" means one or more, with "more than" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while terms like "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the number of indicated technical features, or the sequential relationship between indicated technical features.

[0014] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0015] Reference Figures 1 to 7 Several embodiments of the seat frame and seating of the present invention are given below.

[0016] like Figures 1 to 4 As shown, the seat frame of the first aspect embodiment of the present invention includes a base 100, a seat frame mechanism 200, a swing assembly, a leg extension mechanism 400, a rotating rod 410, a first locking structure 510, and a second locking structure 520. The seat frame mechanism 200 is used to mount the seat cushion, and the leg extension mechanism 400 is used to mount the leg rest.

[0017] The seat frame can be adjusted to three positions: sitting, TV position, and reclining. It can transition from a sitting to a TV position and then back to a reclining position. Conversely, it can also transition from a reclining to a TV position and then back to a sitting position. When the seat frame is in the reclining position, it achieves zero gravity, simulating the posture of an astronaut in weightlessness in space, allowing the user's spine and muscles to relax naturally and effectively reducing body stress. When transitioning between the sitting and TV positions, the seat cushion angle remains constant, while the leg extension mechanism 400 moves to adjust the leg rest angle. When transitioning between the TV and reclining positions, the leg rest angle remains constant, while the base assembly moves to adjust the seat cushion angle.

[0018] like Figures 1 to 4 As shown, the seat frame mechanism 200 includes a first link 210, a second link 220, a third link 230, and a fourth link 240; one end of the third link 230 is rotatably connected to the first link 210, and the other end is rotatably connected to the second link 220; one end of the fourth link 240 is rotatably connected to the first link 210, and the other end is rotatably connected to the second link 220; the first link 210 is located above the second link 220, and the first link 210 is used to mount the seat cushion; the leg extension mechanism 400 is rotatably connected to the third link 230.

[0019] The seat frame mechanism 200 forms a linkage structure through a first link 210, a second link 220, a third link 230, and a fourth link 240. The third link 230 and the fourth link 240 rotate synchronously to drive the leg extension mechanism 400 to rotate, allowing the leg extension mechanism 400 to extend or fold. The first link 210 is used to install the seat cushion. The lengths of the third link 230 and the fourth link 240 are approximately the same. That is, the distance between the junction of the third link 230 and the first link 210 and the junction of the third link 230 and the second link 220 is approximately equal to the distance between the junction of the fourth link 240 and the first link 210 and the junction of the fourth link 240 and the second link 220. This ensures that the angle of the first link 210 remains basically unchanged during the rotation of the third link 230 and the fourth link 240 relative to the second link 220, thereby achieving the adjustment of the leg support angle while keeping the seat cushion angle constant. To ensure a good user experience, the first link 210 is tilted upwards along the direction from the rear to the front of the seat frame.

[0020] The leg extension mechanism 400 is a linkage mechanism used to mount the leg rest. The leg extension mechanism 400 adjusts the angle and height of the leg rest through its extension and retraction movement, thereby switching the seat frame between a sitting position and a TV position. The third link 230 is rotatably connected to the second link 220, and the rotating rod 410 is rotatably connected to the third link 230 and the leg extension mechanism 400. Simultaneously, the leg extension mechanism 400 is also rotatably connected to the second link 220. Therefore, the leg extension mechanism 400 and the third link 230 form a unified moving unit. When the third link 230 rotates, the leg extension mechanism 400 can extend in front of the first link 210 or retract below the first link 210; when the rotation of the third link 230 is restricted, the leg extension mechanism 400 remains in its current position, i.e., the leg rest remains at its current angle and height.

[0021] The leg extension mechanism 400 is positioned in front of the seat frame mechanism 200. When the seat frame is placed against the wall, the wall is located on the side of the seat frame mechanism 200 away from the leg extension mechanism 400, that is, the wall is located behind the seat frame. During the process of the seat frame switching from the sitting posture to the TV posture, as the third link 230 and the fourth link 240 rotate, the seat cushion moves forward, so that there is enough space between the seat frame and the wall, which facilitates the subsequent adjustment of the seat cushion angle and helps to achieve zero wall contact with the seat frame.

[0022] like Figures 1 to 4 As shown, the swing assembly includes a first swing rod 310 and a second swing rod 320. One end of the first swing rod 310 is rotatably connected to the second connecting rod 220, and the other end is rotatably connected to the base 100. One end of the second swing rod 320 is rotatably connected to the second connecting rod 220, and the other end is rotatably connected to the base 100.

[0023] The seat frame mechanism 200 is located on the swing assembly. The base 100, the first swing rod 310, the second swing rod 320 and the second connecting rod 220 are connected to form a linkage structure. The synchronous rotation of the first swing rod 310 and the second swing rod 320 causes the angle of the second connecting rod 220 to change, which in turn changes the angle of the seat cushion on the first connecting rod 210, so that the seat frame can switch between the TV posture state and the reclining posture state.

[0024] The first swing rod 310 is located on the side of the second swing rod 320 near the leg extension mechanism 400. The length of the first swing rod 310 is greater than the length of the second swing rod 320. As the first swing rod 310 and the second swing rod 320 rotate forward synchronously, the end of the seat frame mechanism 200 connected to the leg extension mechanism 400 moves upward to change the angle of the seat cushion. At the same time, the position of the leg rest is raised, which is conducive to achieving zero gravity.

[0025] like Figures 1 to 2As shown, during the process of switching the seat frame from a sitting position to a TV position, the rotation of the first swing rod 310 is restricted, and the third link 230 rotates forward, which drives the leg extension mechanism 400 to rotate; during the process of switching the seat frame from a TV position to a reclining position, the rotation of the third link 230 is restricted, and the first swing rod 310 rotates forward, which drives the seat cushion to change its angle; that is to say, when the seat frame switches from a sitting position to a TV position and from a TV position to a reclining position, the seat frame extends in the same direction, which facilitates the control of the seat frame extension through a single drive component 600. Figures 2 to 3 As shown, the process of switching the seat from a reclining position to a TV position is the reverse of the process of switching the seat from a TV position to a reclining position, and the process of switching the seat from a TV position to a sitting position is the reverse of the process of switching the seat from a sitting position to a TV position. These will not be elaborated on further here.

[0026] like Figures 4 to 6 As shown, one end of the first locking structure 510 is rotatably connected to the third link 230, and the other end is rotatably connected to the second link 220; one end of the second locking structure 520 is rotatably connected to the first swing rod 310, and the other end is rotatably connected to the second link 220; during the switching between the seat frame in a sitting position and a TV position, the second link 220 and the third link 230 rotate synchronously to drive the leg extension mechanism 400 to extend and retract; the second locking structure 520 restricts the rotation of the first swing rod 310 relative to the second link 220; during the switching between the seat frame in a TV position and a reclining position, the first swing rod 310 and the second swing rod 320 can rotate synchronously relative to the second link 220 to change the angle of the seat cushion; at this time, the first locking structure 510 restricts the rotation of the third link 230 relative to the second link 220.

[0027] The first locking structure 510 restricts the rotation of the third link 230, and the second locking structure 520 restricts the rotation of the first swing arm 310. When the seat frame switches between a sitting position and a TV position, the third link 230 can rotate relative to the second link 220, and the second locking structure 520 restricts the rotation of the first swing arm 310. At this time, the rotation of the first swing arm 310 is restricted, and the third link 230 and the fourth link 240 rotate synchronously, which facilitates adjusting the angle of the leg rest while keeping the seat angle unchanged. When the seat frame switches between a TV position and a reclining position, the first locking structure 510 restricts the rotation of the third link 230, and the first swing arm 310 can rotate relative to the second link 220. At this time, the rotation of the third link 230 is restricted, and the first swing arm 310 and the second swing arm 320 can rotate synchronously relative to the base 100, which facilitates adjusting the angle of the seat cushion while keeping the leg rest angle unchanged. When adjusting the leg rest angle, the seat cushion angle can be kept constant, which is beneficial for the seat frame to correctly switch to sitting, TV, or reclining positions.

[0028] The seat frame of the present invention includes a seat frame mechanism 200 for mounting the seat cushion and a leg extension mechanism 400 for mounting the leg rest. A second locking structure 520 restricts the rotation of the first swing rod 310, and the rotation of the third link 230 and the fourth link 240 allows for adjustment of the leg rest angle while maintaining a constant seat cushion angle, thereby enabling the seat frame to switch between a TV posture and a sitting posture. Similarly, the first locking structure 510 restricts the rotation of the third link 230, and the rotation of the first swing rod 310 and the second swing rod 320 allows for adjustment of the seat cushion angle while maintaining a constant leg rest angle, thereby enabling the seat frame to switch between a TV posture and a reclining posture. Therefore, the seat frame can switch between a sitting posture, a TV posture, and a reclining posture.

[0029] like Figure 4 As shown, in some embodiments, the seat frame further includes a drive component 600, which is disposed on the base 100 and rotatably connected to the seat frame mechanism 200; the drive component 600 is used to drive the third link 230 and the leg extension mechanism 400 to rotate, and also to drive the first swing rod 310 and the second swing rod 320 to rotate.

[0030] With the second locking structure 520 restricting the rotation of the first swing rod 310, the third link 230 and the fourth link 240 can rotate freely. The drive component 600 drives the third link 230 and the fourth link 240 to rotate through length changes, thereby driving the leg extension mechanism 400 to extend, so as to adjust the angle of the leg rest while keeping the angle of the seat cushion constant. With the first locking structure 510 restricting the rotation of the third link 230, the length change of the drive component 600 can no longer drive the leg extension mechanism 400 to rotate. However, at this time, the first swing rod 310 and the second swing rod 320 can rotate relative to the base 100. The drive component 600 drives the first swing rod 310 and the second swing rod 320 to rotate through length changes, so as to adjust the angle of the seat cushion while keeping the angle of the leg rest constant. Therefore, the seat frame of this application uses a single drive component 600 to both drive the leg extension mechanism 400 to rotate and drive the seat cushion to change angle.

[0031] The drive component 600 is a component capable of outputting linear motion; specifically, the drive component 600 can be a push rod motor. The seat frame also includes a connecting component 610, which is fixedly connected to the third link 230, and the end of the drive component 600 is rotatably connected to the connecting component 610. Changes in the length of the drive component 600 can drive the connecting component 610 to move.

[0032] In some embodiments, when the seat frame switches from a sitting position to a TV position, the first locking structure 510 strikes the second locking structure 520, and the second locking structure 520 restricts the rotation of the first swing rod 310 relative to the second link 220; when the seat frame switches from a reclining position to a TV position, the second locking structure 520 strikes the first locking structure 510, and the first locking structure 510 restricts the rotation of the third link 230 relative to the second link 220.

[0033] When the seat frame rotates to the TV position, the first locking structure 510 impacts the second locking structure 520, causing the second locking structure 520 to abut against the first locking structure 510. That is, the first locking structure 510 restricts the rotation of the second locking structure 520, and the second locking structure 520 restricts the rotation of the first swing rod 310 relative to the second link 220. When the seat frame switches from the reclining position to the TV position, the second locking structure 520 impacts the first locking structure 510, causing the second locking structure 520 to abut against the first locking structure 510. That is, the second locking structure 520 restricts the rotation of the first locking structure 510, and the first locking structure 510 restricts the rotation of the third link 230 relative to the second link 220, so that the leg extension mechanism remains in the extended state.

[0034] like Figures 4 to 6As shown, in some embodiments, both the first locking structure 510 and the second locking structure 520 include a first rod 530 and a second rod 540 hinged together. The end of the first rod 530 away from the second rod 540 is rotatably connected to the third link 230 or the first swing rod 310, forming a first intersection point 550. The end of the second rod 540 away from the first rod 530 is rotatably connected to the second link 220, forming a second intersection point 560. When both the first rod 530 and the second rod 540 are arranged along the direction from the first intersection point 550 to the second intersection point 560, the rotation of the third link 230 or the first swing rod 310 is restricted.

[0035] In the first locking structure 510, the first rod 530 is rotatably connected to the third link 230, and the first rod 530, the second rod 540, the third link 230, and the second link 220 form a linkage structure; the first rod 530 is rotatably connected to the third link 230 to form a first intersection point 550, and the second rod 540 is rotatably connected to the second link 220 to form a second intersection point 560, and the first rod 530 and the second rod 540 are hinged; the first rod 530 is rotatably connected along the path from the first intersection point 550 to the second intersection point 560. When the direction of the first link 530 is set at 60°, and the second link 540 is set along the direction from the first intersection point 550 to the second intersection point 560, that is, when the first link 530 and the second link 540 are connected to form a straight line, the first link 530 and the second link 540 form a rod-shaped whole to support the third link 230 and the second link 220. At this time, the first link 530, the second link 540, the third link 230 and the second link 220 form a stable triangle, thereby restricting the rotation of the third link 230. When the first link 530 and the second link 540 cannot form a straight line, the first link 530 and the second link 540 are intersecting, and the first link 530 can rotate relative to the second link 540, so that the third link 230 can rotate relative to the second link 220, thereby realizing the extension or folding of the leg extension mechanism 400.

[0036] In the second locking structure 520, the first rod 530 is rotatably connected to the first swing rod 310, and the first rod 530, the second rod 540, the first swing rod 310, and the second swing rod 320 form a connecting rod structure; the first rod 530 is rotatably connected to the first swing rod 310 and forms a first intersection point 550, the second rod 540 is rotatably connected to the second connecting rod 220 and forms a second intersection point 560, and the first rod 530 and the second rod 540 are hinged; the first rod 530 extends along the path from the first intersection point 550 to the second intersection point... When the first rod 530 is oriented at 560 and the second rod 540 is oriented along the direction from the first intersection point 550 to the second intersection point 560, i.e., the first rod 530 and the second rod 540 are on the same straight line, the first rod 530 and the second rod 540 form a rod-shaped whole to support the first swing rod 310 and the second connecting rod 220. At this time, the first rod 530, the second rod 540, the first swing rod 310 and the second swing rod 320 form a stable triangle, thereby restricting the rotation of the first swing rod 310. When the first rod 530 and the second rod 540 cannot form a straight line, the first rod 530 and the second rod 540 are intersecting, and the first rod 530 can rotate relative to the second rod 540, so that the first swing rod 310 can rotate relative to the second connecting rod 220 to change the angle of the seat cushion.

[0037] During the transition from a seated position to a TV position, initially, the second locking structure 520 restricts the rotation of the first swing rod 310, and the first locking structure 510 no longer restricts the rotation of the third link 230. When the third link 230 rotates, the leg extension mechanism 400 extends, and the first rod 530 and the second rod 540 of the first locking structure 510 rotate relative to each other. When both the first rod 530 and the second rod 540 of the first locking structure 510 are positioned along the direction from the first intersection point 550 to the second intersection point 560, the angle between the third link 230 and the second link 220 is at its maximum, and the third link 230 cannot continue to rotate. At this point, the first locking structure 510 restricts the rotation of the third link 230, and the leg extension mechanism 400 fully extends, thus transitioning the seat from a seated position to a TV position. The rotation of the first swing rod 310 changes the angle of the seat cushion, and the relative rotation of the first rod 530 and the second rod 540 of the second locking structure 520 transitions the seat from a TV position to a reclining position. Therefore, the seat frame can switch between sitting, TV-like, and reclining positions.

[0038] During the transition from a reclining to a TV-like position, initially, the first locking structure 510 restricts the rotation of the third link 230, while the second locking structure 520 no longer restricts the rotation of the first swing rod 310. The first swing rod 310 rotates, causing the seat cushion to rotate and change its angle. When the first rod 530 and the second rod 540 of the second locking structure 520 are both positioned along the direction from the first intersection point 550 to the second intersection point 560, the angle between the first swing rod 310 and the second link 220 is at its maximum, and the first swing rod 310 can no longer rotate. At this point, the second locking structure 520 restricts the rotation of the first swing rod 310, and the angle of the seat cushion rotates to its minimum, thus transitioning the seat from a reclining to a TV-like position. The rotation of the third link 230 causes the leg extension mechanism 400 to rotate and fold, and the first rod 530 and the second rod 540 of the first locking structure 510 rotate relative to each other, thus transitioning the seat from a TV-like position to a sitting position. Therefore, the seat can transition from a reclining position to a TV-like position and then to a sitting position.

[0039] In some embodiments, the line connecting the first intersection point 550 and the second intersection point 560 of the first locking structure 510 is the first connecting line X; when the first rod 530 and the second rod 540 of the first locking structure 510 are both arranged along the direction from the first intersection point 550 to the second intersection point 560, the first rod 530 and the second rod 540 of the first locking structure 510 both coincide with the first connecting line X, or the first rod 530 and the second rod 540 of the first locking structure 510 both intersect with the first connecting line X, and the included angle between the first rod 530 and the first connecting line X is less than or equal to a first set angle, and the included angle between the second rod 540 and the second connecting line Y is less than or equal to the first set angle.

[0040] When the first rod 530 and the second rod 540 of the first locking structure 510 both coincide with the first connecting line X, the first rod 530 and the second rod 540 form a straight line, and the first rod 530 and the second rod 540, together with the second connecting rod 220 and the third connecting rod 230, form a triangular structure. This improves the load-bearing capacity of the seat frame mechanism 200 while restricting the rotation of the third connecting rod 230. When the angle between the first rod 530 and the first connecting line X is less than or equal to a first set angle, and the angle between the second rod 540 and the second connecting line Y is less than or equal to the first set angle, the angles between the first rod 530 and the first connecting line X and the angle between the second rod 540 and the first connecting line X are small. The first rod 530 and the second rod 540, together with the second connecting rod 220 and the third connecting rod 230, form an approximately triangular structure. In this case, the first locking structure 510 can also restrict the rotation of the third connecting rod 230.

[0041] In some embodiments, the line connecting the first intersection point 550 and the second intersection point 560 of the second locking structure 520 is the second connecting line Y; when the first rod 530 and the second rod 540 are both arranged along the direction from the first intersection point 550 to the second intersection point 560, the first rod 530 and the second rod 540 of the second locking structure 520 both coincide with the second connecting line Y, or the first rod 530 and the second rod 540 of the second locking structure 520 both intersect with the second connecting line Y, and the included angle between the first rod 530 and the second connecting line Y is less than or equal to the first set angle, and the included angle between the second rod 540 and the second connecting line Y is less than or equal to the first set angle.

[0042] When the first rod 530 and the second rod 540 of the second locking structure 520 both coincide with the second connecting line Y, the first rod 530 and the second rod 540 form a straight line. The first rod 530 and the second rod 540, together with the second connecting rod 220 and the first swing rod 310, form a triangular structure, which improves the load-bearing capacity of the seat frame while restricting the rotation of the first swing rod 310. When the angle between the first rod 530 and the second connecting line Y of the second locking structure 520 is less than or equal to a first set angle, and the angle between the second rod 540 and the second connecting line Y is also less than or equal to the first set angle, the angles between the first rod 530 and the second connecting line Y, and the angle between the second rod 540 and the second connecting line Y, are relatively small. The first rod 530 and the second rod 540, together with the second connecting rod 220 and the first swing rod 310, form an approximately triangular structure. In this case, the second locking structure 520 can restrict the rotation of the first swing rod 310. The first set angle can be 2°, 3°, or 4°.

[0043] like Figures 4 to 6 As shown, in some embodiments, the first locking structure 510 is provided with a first mating part 5121, and the second locking structure 520 is provided with a second mating part 5221; during the process of the seat frame switching to the TV posture state, the first mating part 5121 impacts the second mating part 5221 or the second mating part 5221 impacts the first mating part 5121.

[0044] Understandably, during the process of switching the seat frame from a sitting position to a TV position, the first lever 530 and the second lever 540 of the first locking structure 510 rotate to be aligned along the direction from the first intersection point 550 to the second intersection point 560. At this time, the first lever 530 and the second lever 540 are connected in a straight line, and the first mating part 5121 impacts the second mating part 5221, causing the second locking structure 520 to rotate, so that the first lever 530 and the second lever 540 of the second locking structure 520 are no longer aligned along the direction from the first intersection point 550 to the second intersection point 560; that is, during the process of switching the seat frame from a sitting position to a TV position... During the process of switching from a reclining position to a TV position, the second engaging part 5221 is located on the movement path of the first engaging part 5121. When the first rod 530 and the second rod 540 of the first locking structure 510 are connected to form a straight line, the second engaging part 5221 moves under the push of the first engaging part 5121, causing the first rod 530 and the second rod 540 of the second locking structure 520 to no longer be connected to form a straight line. That is, the angle between the first rod 530 and the second rod 540 of the second locking structure 520 and the second connecting line Y is less than or equal to the first set angle, so as to allow relative rotation of the first rod 530 and the second rod 540 of the second locking structure 520. Similarly, during the process of switching the seat from a reclining position to a TV position, the first engaging part 5121 is located on the movement path of the second engaging part 5221, so that the second engaging part 5221 impacts the first engaging part 5121, causing the first rod 530 and the second rod 540 of the first locking structure 510 to no longer be connected to form a straight line, so as to allow relative rotation of the first rod 530 and the second rod 540 of the first locking structure 510.

[0045] It should be noted that when the first mating part 5121 impacts the second mating part 5221, the second mating part 5221 undergoes a small displacement, preventing the first rod 530 and the second rod 540 of the second locking structure 520 from connecting to form a straight line; that is, the first rod 530 and the second rod 540 only need to have a small included angle. Similarly, when the second mating part 5221 impacts the first mating part 5121, only a small displacement movement of the first mating part 5121 is required.

[0046] like Figures 8 to 9As shown, in some embodiments, the line connecting the first intersection point 550 and the second intersection point 560 of the second locking structure 520 is the second connecting line Y; before the first mating part 5121 impacts the second mating part 5221, the first rod 530 and the second rod 540 of the second locking structure 520 both coincide with the second connecting line Y, and the first rod 530 and the second rod 540 form a straight line, that is, the angle between the first rod 530 and the second connecting line Y of the second locking structure 520 is 0°, and the angle between the second rod 540 and the second connecting line Y of the second locking structure 520 is 0°; at this time, the first rod 530 and the second rod 540, as well as the second connecting rod 220 and the first swing rod 310 form a triangular structure, which improves the load-bearing capacity of the seat frame while limiting the first... The first locking structure 520 rotates the first swing rod 310; or, before the first mating part 5121 strikes the second mating part 5221, the first rod 530 of the second locking structure 520 intersects the second connecting line Y, and the angle between the first rod 530 and the second connecting line Y is less than or equal to the first set angle, the angle between the second rod 540 and the second connecting line Y is less than or equal to the first set angle, the angle between the first rod 530 and the second connecting line Y and the angle between the second rod 540 and the second connecting line Y are small, the first rod 530 and the second rod 540, the second connecting rod 220 and the first swing rod 310 form an approximately triangular structure, at this time, the second locking structure 520 can restrict the rotation of the first swing rod 310. After the first mating part 5121 impacts the second mating part 5221, the first rod 530 and the second rod 540 of the second locking structure 520 both intersect with the second connecting line Y. The angle between the first rod 530 and the second connecting line Y of the second locking structure 520 is greater than the first set angle and less than or equal to the second set angle. The angle between the second rod 540 and the second connecting line Y of the second locking structure 520 is greater than the first set angle and less than or equal to the second set angle. The angles between the first rod 530 and the second connecting line Y and the angle between the second rod 540 and the second connecting line Y of the second locking structure 520 are slightly larger, which facilitates driving the first swing rod 310 to rotate to switch the state of the seat frame.

[0047] In some embodiments, after the first mating part 5121 impacts the second mating part 5221, the angle between the first rod 530 of the second locking structure 520 and the second connecting line Y is greater than or equal to a third set angle, and the angle between the second rod 540 of the second locking structure 520 and the second connecting line Y is greater than or equal to the third set angle. The first mating part 5121 impacts the second mating part 5221, that is, the first mating part 5121 applies a certain impact force to the second mating part 5221, causing the first rod 530 and the second rod 540 of the second locking structure 520 to rotate. This makes the angle between the first rod 530 and the second connecting line Y of the second locking structure 520 greater than or equal to a third preset angle, and the angle between the second rod 540 and the second connecting line Y of the second locking structure 520 greater than or equal to the third preset angle. Through the impact action, the angles between the first rod 530 and the second connecting line Y and the second rod 540 and the second connecting line Y are increased, facilitating the rotation of the first rod 530 and the second rod 540 of the second locking structure 520 under the action of the driving component 600, so as to switch the seat frame state. The second preset angle can be 9°, 10° or 11°, and the third preset angle can be 14°, 15° or 16°.

[0048] like Figures 4 to 6 As shown, in some embodiments, the second locking structure 520 further includes a second elastic member 524, which cooperates with the first rod 530 and the second connecting rod 220 of the second locking structure 520 respectively; before the first mating part 5121 impacts the second mating part 5221, the second elastic member 524 provides an elastic force to the second locking structure 520, so that the angle between the first rod 530 and the second connecting line of the second locking structure 520 is less than or equal to a first set angle, and the angle between the second rod 540 and the second connecting line of the second locking structure 520 is less than or equal to the first set angle.

[0049] The elastic force of the second elastic element 524 causes the first rod 530 and the second rod 540 of the second locking structure 520 to be set along the direction from the first intersection point 550 to the second intersection point 560, so that the angle between the first rod 530 and the second connecting line of the second locking structure 520 is kept less than or equal to the first set angle, and the angle between the second rod 540 and the second connecting line of the second locking structure 520 is kept less than or equal to the first set angle, and the relative positions of the first rod 530 and the second rod 540 of the second locking structure 520 remain unchanged; using the elastic force of the second elastic element 524, the first rod 530 is set along the extension direction of the second rod 540, thereby making the first rod 530 and the second rod 540 connect to form a straight line; at this time, it is necessary to To overcome the elastic force of the second elastic element 524, the first rod 530 and the second rod 540 of the second locking structure 520 are no longer set along the second connecting line Y. The second elastic element 524 is a spring, and the second elastic element 524 and the second rod 540 are set side by side. When the first rod 530 and the second rod 540 of the second locking structure 520 are set along the second connecting line Y, the second elastic element 524 is stretched. The elastic force of the second elastic element 524 pulls the first rod 530, so that the first rod 530 and the second rod 540 are kept in the state set along the direction from the first intersection point 550 to the second intersection point 560, thereby keeping the relative position of the first rod 530 and the second rod 540 of the first locking structure 510 unchanged.

[0050] In some embodiments, during the impact of the first mating part 5121 on the second mating part 5221, the first rod 530 of the second locking structure 520 rotates along the first direction c, and simultaneously, the second rod 540 of the second locking structure 520 rotates to increase the angle between the first rod 530 and the second rod 540 of the second locking structure 520, facilitating subsequent switching of the seat frame state; the second elastic member 524 provides an elastic force to the second locking structure 520, so that the first rod 530 of the second locking structure 520 tends to rotate along the second direction d; the first direction c and the second direction d are opposite; that is, the impact of the first mating part 5121 on the second mating part 5221 causes the second locking structure 520 to rotate along the second direction d. The first rod 530 of the second locking structure 520 rotates along the first direction c. At this time, the first rod 530 of the second locking structure 520 needs to overcome the elastic force of the second elastic member 524 in order to rotate along the first direction c. That is, the first mating part 5121 impacts the second mating part 5221, so that the first rod 530 and the second rod 540 of the second locking structure 520 rotate relative to the second connecting rod 220. The second elastic member 524 respectively engages with the first rod 530 and the second connecting rod 220 of the second locking structure 520, so that when the first rod 530 and the second rod 540 of the second locking structure 520 rotate under the action of the first mating part 5121, they need to overcome the elastic force of the second elastic member 524. Figure 9As shown, the first direction c is clockwise, and the second direction d is counterclockwise.

[0051] In some embodiments, the second link 220 is provided with a fixing rod 224. One end of the second elastic member 524 is connected to the fixing rod 224, and the other end is connected to the first rod 530 of the second locking structure 520. The fixing rod 224 can fix the second elastic member 524. The fixing rod 224 is used to abut against the second rod 540 of the second locking structure 520. Through the abutment of the fixing rod 224 and the second rod 540 of the second locking structure 520, the rotation of the second rod 540 of the second locking structure 520 can be restricted, thereby limiting the rotation range of the second locking structure 520. That is, on the one hand, the fixing rod 224 can fix the second elastic member 524, and on the other hand, the fixing rod 224 can limit the rotation range of the second locking structure 520.

[0052] In some embodiments, the line connecting the first intersection point 550 and the second intersection point 560 of the first locking structure 510 is the first connecting line X; before the second mating part 5221 impacts the first mating part 5121, the first rod 530 and the second rod 540 of the first locking structure 510 both coincide with the first connecting line X, that is, the angle between the first rod 530 and the first connecting line X of the first locking structure 510 is 0°, and the angle between the second rod 540 and the first connecting line X is 0°. At this time, the first rod 530 and the second rod 540 form a straight line, and the first rod 530, the second rod 540, the second connecting rod 220, and the third connecting rod 230 form a triangular structure, which improves the load-bearing capacity of the seat frame mechanism 200 while restricting the rotation of the third connecting rod 230; or Before the second mating part 5221 impacts the first mating part 5121, the first rod 530 and the second rod 540 of the first locking structure 510 both intersect with the first connecting line X, and the angle between the first rod 530 and the first connecting line X is less than or equal to a first preset angle, and the angle between the second rod 540 and the first connecting line X is also less than or equal to the first preset angle. The angles between the first rod 530 and the first connecting line X, and between the second rod 540 and the first connecting line X, are relatively small. The first rod 530, the second rod 540, the second connecting rod 220, and the third connecting rod 230 form an approximately triangular structure, allowing the first locking structure 510 to restrict the rotation of the third connecting rod 230. After the second mating part 5221 impacts the first mating part 5121, the second mating part 5221 pushes the first locking structure 510 to rotate. After the second mating part 5221 impacts the first mating part 5121, the angle between the first rod 530 of the first locking structure 510 and the first connecting line X is greater than the first set angle and less than or equal to the second set angle. The angle between the second rod 540 of the first locking structure 510 and the first connecting line X is greater than the first set angle and less than or equal to the second set angle. The angles between the first rod 530 and the first connecting line X and the second rod 540 and the first connecting line X are slightly larger, which facilitates driving the third connecting rod 230 to rotate to switch the state of the seat frame.

[0053] In some embodiments, after the second mating part 5221 impacts the first mating part 5121, the angle between the first rod 530 of the first locking structure 510 and the first connecting line X is greater than or equal to a third preset angle, and the angle between the second rod 540 of the first locking structure 510 and the first connecting line X is greater than or equal to a third preset angle. The second mating part 5221 impacts the first mating part 5121, that is, the second mating part 5221 applies a certain impact force to the first mating part 5121, causing the first rod 530 and the second rod 540 of the first locking structure 510 to rotate, so that the angle between the first rod 530 and the first connecting line X of the first locking structure 510 is greater than or equal to a third preset angle, and the angle between the second rod 540 and the first connecting line X of the first locking structure 510 is greater than or equal to the third preset angle. Through the impact action, the angles between the first rod 530 and the first connecting line X and the second rod 540 of the first locking structure 510 are increased, which facilitates the rotation of the first rod 530 and the second rod 540 of the first locking structure 510 under the action of the driving component 600, so as to switch the seat frame state. The second preset angle can be 9°, 10° or 11°, and the third preset angle can be 14°, 15° or 16°.

[0054] like Figures 4 to 6 As shown, in some embodiments, the first locking structure 510 further includes a first elastic member 514, which engages with the second rod 540 and the third connecting rod 230 of the first locking structure 510 respectively; before the second engaging part 5221 impacts the first engaging part 5121, the first elastic member 514 provides an elastic force to the first locking structure 510, such that the angle between the first rod 530 of the first locking structure 510 and the first connecting line X is less than or equal to a first set angle, and the angle between the second rod 540 of the first locking structure 510 and the first connecting line X is less than or equal to the first set angle.

[0055] The elastic force of the first elastic element 514 causes the first rod 530 and the second rod 540 of the first locking structure 510 to be set along the direction from the first intersection point 550 to the second intersection point 560, so that the angle between the first rod 530 and the first connecting line X of the first locking structure 510 is kept less than or equal to the first set angle, and the angle between the second rod 540 and the first connecting line X of the first locking structure 510 is kept less than or equal to the first set angle, and the relative positions of the first rod 530 and the second rod 540 of the first locking structure 510 remain unchanged; using the elastic force of the first elastic element 514, the first rod 530 is set along the extension direction of the second rod 540, thereby making the first rod 530 and the second rod 540 connect to form a straight line; at this time, The elastic force of the first elastic element 514 needs to be overcome so that the first rod 530 and the second rod 540 of the first locking structure 510 are no longer set along the first connecting line X. The first elastic element 514 is a spring, and the first elastic element 514 and the second rod 540 are set side by side. When the first rod 530 and the second rod 540 of the first locking structure 510 are set along the first connecting line X, the first elastic element 514 is stretched. The elastic force of the first elastic element 514 pulls the first rod 530, so that the first rod 530 and the second rod 540 are kept in the state set along the direction from the first intersection point 550 to the second intersection point 560, thereby keeping the relative position of the first rod 530 and the second rod 540 of the first locking structure 510 unchanged.

[0056] In some embodiments, during the impact of the second mating part 5221 on the first mating part 5121, the first rod 530 of the first locking structure 510 rotates along the third direction e, and simultaneously, the second rod 540 of the first locking structure 510 rotates to increase the angle between the first rod 530 and the second rod 540 of the first locking structure 510, facilitating subsequent switching of the seat frame state; the first elastic member 514 provides an elastic force to the first locking structure 510, so that the first rod 530 of the first locking structure 510 tends to rotate along the fourth direction f; the third direction e and the fourth direction f are opposite; that is, the impact of the second mating part 5221 on the first mating part 5121 causes the first locking structure 510 to rotate along the fourth direction f. The first rod 530 of the first locking structure 510 rotates along the third direction e. At this time, the first rod 530 of the first locking structure 510 needs to overcome the elastic force of the first elastic member 514 in order to rotate along the third direction e. That is, the second mating part 5221 impacts the first mating part 5121 so that the first rod 530 and the second rod 540 of the first locking structure 510 rotate relative to the second connecting rod 220. The first elastic member 514 respectively engages with the first rod 530 and the second connecting rod 220 of the first locking structure 510 so that when the first rod 530 and the second rod 540 of the first locking structure 510 rotate under the action of the second mating part 5221, they need to overcome the elastic force of the first elastic member 514. Figure 8As shown, the third direction e is counterclockwise, and the fourth direction f is clockwise.

[0057] like Figures 8 to 9 As shown, in some embodiments, in the TV position of the seat frame, the first mating part 5121 and the second mating part 5221 abut against each other, that is, the second locking structure 520 can provide a certain support for the first locking structure 510, improving the stability of the seat frame in the TV position; in the sitting position, the first mating part 5121 and the second mating part 5221 disengage, and the first rod 530 and the second rod 540 of the first locking structure 510 can rotate relative to each other, reducing the influence of the second mating part 5221 on the first locking structure 510, so that the seat frame can switch from the sitting position to the TV position; in the reclining position of the seat frame, the first mating part 5121 and the second mating part 5221 disengage, and the first rod 530 and the second rod 540 of the second locking structure 520 can rotate relative to each other, reducing the influence of the first mating part 5121 on the second locking structure 520, so that the seat frame can switch from the reclining position to the TV position.

[0058] like Figures 3 to 6 As shown, in some embodiments, the third link 230 is rotatably connected to the second link 220, forming a first hinge point 250, and the first swing rod 310 is rotatably connected to the second link 220, forming a second hinge point 260. The second hinge point 260 is located on the side of the first hinge point 250 away from the leg extension mechanism 400, so that the seat frame mechanism 200 can be set as close as possible to the front of the seat frame, which facilitates the installation of the backrest at the rear of the seat frame. During the process of the seat frame switching from the TV posture state to the reclining posture state, the third link 230 rotates forward, driving the seat frame mechanism 200 to move forward, so that the seat frame mechanism 200 moves forward, leaving enough space between the seat frame and the wall, which facilitates the subsequent adjustment of the seat cushion angle and helps to achieve zero wall contact with the seat frame.

[0059] The second intersection point 560 of the first locking structure 510 is located between the first hinge point 250 and the second hinge point 260, which facilitates the function of the first mating part 5121 and the second mating part 5221.

[0060] like Figures 4 to 6As shown, in some embodiments, the first mating part 5121 is disposed on the second rod 540 of the first locking structure 510, and the second mating part 5221 is disposed on the first rod 530 of the second locking structure 520. When the first rod 530 and the second rod 540 of the first locking structure 510 are connected to form a straight line, the first rod 530 of the first locking structure 510 is located on the side of the second rod 540 away from the second locking structure 520; when the first rod 530 and the second rod 540 of the second locking structure 520 are connected to form a straight line, the second rod 540 of the second locking structure 520 is located on the side of the first rod 530 away from the first locking structure 510. Therefore, by disposing the first mating part 5121 on the second rod 540 of the first locking structure 510 and the second mating part 5221 on the first rod 530 of the second locking structure 520, the distance between the first mating part 5121 and the second mating part 5221 can be reduced.

[0061] like Figures 4 to 6 As shown, in some embodiments, the first swing arm 310 is located at the end of the second link 220 near the third link 230; the second rod 540 of the first locking structure 510 includes a first locking section 511 and a first mating section 512 connected together, the first locking section 511 being rotatably connected to the first rod 530 and the second link 220 of the first locking structure 510; the first mating section 512 is located on the side of the first locking section 511 away from the first rod 530, and the first mating section 512 is provided with a first mating part 5121; the first rod 530 of the second locking structure 520 includes a second locking section 521 and a second mating section 522 connected together, the second locking section 521 being rotatably connected to the second rod 540 and the second link 220 of the second locking structure 520; the second mating section 522 is located on the side of the second locking section 521 away from the first rod 530, and the second mating section 522 is provided with a second mating part 5221.

[0062] The first swing arm 310 is located at the end of the second link 220 near the third link 230, which can reduce the distance between the first locking structure 510 and the second locking structure 520. Under the premise of realizing the interaction between the first mating part 5121 and the second mating part 5221, the length of the first mating part 5121 and the second mating part 5221 can be reduced, and the difficulty of the first mating part 5121 and the second mating part 5221 in mate can be reduced.

[0063] It is understandable that, such as Figures 1 to 2 As shown, during the process of the seat frame switching from a sitting position to a TV position, the third link 230 rotates, and the first locking structure 510 rotates accordingly; as Figure 5As shown, in the first locking structure 510, with the second intersection point 560 as the rotation center, the second rod 540 rotates clockwise, and with the first intersection point 550 as the rotation center, the first locking segment 511 and the first mating segment 512 rotate counterclockwise. When the first rod 530 and the second rod 540 of the first locking structure 510 are connected to form a straight line, the first rod 530 and the second rod 540 cannot continue to rotate. At the same time, the first mating part 5121 pushes the second mating part 5221 to rotate, that is, pushes the second locking segment 521 to rotate clockwise, so that the first rod 530 and the second rod 540 of the second locking structure 520 no longer form a straight line, thereby allowing the first rod 530 of the second locking structure 520 to rotate relative to the second rod 540. The first swing rod 310 and the second swing rod 320 can rotate freely, so that the seat can smoothly switch between the TV posture state and the reclining posture state.

[0064] like Figures 2 to 3 As shown, during the process of switching the seat from a reclining position to a TV position, the first swing arm 310 rotates, and the second locking structure 520 rotates accordingly; as Figure 5 As shown, in the second locking structure 520, with the second intersection point 560 as the rotation center, the second rod 540 rotates clockwise, and with the first intersection point 550 as the rotation center, the second locking segment 521 and the second mating segment 522 rotate counterclockwise. When the first rod 530 and the second rod 540 are connected to form a straight line, the first rod 530 and the second rod 540 cannot continue to rotate. At the same time, the second mating part 5221 pushes the first mating part 5121 to rotate, that is, pushes the first locking segment 511 to rotate clockwise, so that the first rod 530 and the second rod 540 of the first locking structure 510 no longer form a straight line, thereby allowing the first rod 530 of the first locking structure 510 to rotate relative to the second rod 540.

[0065] In summary, such as Figure 1 and Figure 2As shown, the first locking segment 511 rotates clockwise, causing the first rod 530 and the second rod 540 of the first locking structure 510 to no longer be aligned along the first connecting line X, allowing the first rod 530 to rotate relative to the second rod 540; the second locking segment 521 rotates clockwise, causing the first rod 530 and the second rod 540 of the second locking structure 520 to no longer be aligned along the second connecting line Y, allowing the first rod 530 to rotate relative to the second rod 540; when the first mating part 5121 strikes the second mating part 5221, the first mating segment 512 rotates clockwise. When the second mating section 522 rotates counterclockwise, the second mating section 522 and the second locking section 521 rotate clockwise, thereby causing the first rod 530 and the second rod 540 of the second locking structure 520 to no longer be set along the second connecting line Y; when the second mating part 5221 strikes the first mating part 5121, the second mating section 522 rotates counterclockwise, causing the first mating section 512 and the first locking section 511 to rotate clockwise, thereby causing the first rod 530 and the second rod 540 of the first locking structure 510 to no longer be set along the first connecting line X.

[0066] like Figure 4 As shown, in some embodiments, the first swing arm 310 is provided with a first limiting rod 311, which abuts against the second connecting rod 220 to limit the rotation of the first swing arm 310. The first limiting rod 311 is disposed on the first swing arm 310. During the rotation of the first swing arm 310, the angle between the first swing arm 310 and the second connecting rod 220 changes. By abutting against the second connecting rod 220, the continued rotation of the first swing arm 310 can be limited, preventing the first swing arm 310 from rotating to a position overlapping with the second connecting rod 220.

[0067] like Figure 10 As shown, in some embodiments, the third link 230 is provided with a fourth limiting rod 231, which abuts against the first rod 530 of the first locking structure 510 to restrict the rotation of the first rod 530. The fourth limiting rod 231 is disposed on the third link 230. During the rotation of the first rod 530 relative to the second rod 540, the angle between the first rod 530 and the second link 220 changes. By abutting against the first rod 530 with the fourth limiting rod 231, the continued rotation of the first rod 530 can be restricted, thereby limiting the rotation range of the first rod 530. Specifically, the fourth limiting rod 231 is disposed on one side of the line connecting the first intersection point 550 and the second intersection point 560 of the first locking structure 510, that is, on one side of the first connecting line X. When both the first rod 530 and the second rod 540 of the first locking structure 510 are disposed along the first connecting line X, the fourth limiting rod 231 restricts the continued rotation of the first rod 530.

[0068] like Figure 4 As shown, in some embodiments, the second link 220 is provided with a fifth limiting rod 223, which is used to abut against the fourth link 240 to limit the rotation of the fourth link 240. The fifth limiting rod 223 is provided on the second link 220. During the rotation of the fourth link 240, the angle between the fourth link 240 and the second link 220 changes. By abutting against the fourth link 240 with the fifth limiting rod 223, the fourth link 240 can be restricted from continuing to rotate, preventing the fourth link 240 from rotating to a position overlapping with the second link 220.

[0069] like Figures 4 to 6 As shown, in some embodiments, one of the first mating portion 5121 and the second mating portion 5221 is a mating groove, and the other is a mating protrusion. The mating groove and the mating protrusion make the interaction between the first mating portion 5121 and the second mating portion 5221 more stable and prevent slippage between them. The mating protrusion is cylindrical for easy material selection and processing. The mating groove has an arc-shaped abutment surface 5222 to fit the mating protrusion. Some parts of the second mating segment 522 facing away from the abutment surface 5222 are arc-shaped to avoid the first locking structure 510.

[0070] like Figures 4 to 6As shown, in some embodiments, the first rod 530 and the second rod 540 of the first locking structure 510 intersect at a third intersection point 513, and the first rod 530 and the second rod 540 of the second locking structure 520 intersect at a fourth intersection point 523. The distances between the first intersection point 550 and the second intersection point 560 of the first locking structure 510 and the third intersection point 513 are both less than or equal to one-quarter of the length of the third link 230, and greater than or equal to one-half of the length of the third link 230. In the first locking structure 510, the distances between the first intersection point 550 and the third intersection point 513, and the distances between the second intersection point 560 and the third intersection point 513, are less than or equal to one-quarter of the length of the third link 230, and greater than or equal to one-half of the length of the third link 230. By limiting the distances between the first intersection point 550 and the second intersection point 560 and the third intersection point 513, the stability of the first locking structure 510 can be guaranteed, while interference between the first locking structure 510 and other components can be avoided. If the distance between the first intersection point 550, the second intersection point 560, and the third intersection point 513 is too short, the stability of the first locking structure 510 may be poor; if the distance between the first intersection point 550, the second intersection point 560, and the third intersection point 513 is too long, the rotation of the first locking structure 510 may interfere with the first link 210 or the third link 230. For example, the distance between the first intersection point 550, the second intersection point 560, and the third intersection point 513 of the first locking structure 510 is equal to one-third of the length of the third link 230.

[0071] like Figures 4 to 6As shown, in some embodiments, the distances between the first intersection point 550 and the second intersection point 560 of the second locking structure 520 and the third intersection point 513 are all less than or equal to one-quarter of the length of the first swing rod 310, and greater than or equal to one-half of the length of the first swing rod 310. In the second locking structure 520, the distances between the first intersection point 550 and the third intersection point 513, and the distances between the second intersection point 560 and the third intersection point 513, are less than or equal to one-quarter of the length of the first swing rod 310, and greater than or equal to one-half of the length of the first swing rod 310. By limiting the distances between the first intersection point 550 and the second intersection point 560 and the third intersection point 513, the stability of the second locking structure 520 can be ensured, while interference between the second locking structure 520 and other components can be avoided. If the distance between the first intersection point 550, the second intersection point 560, and the third intersection point 513 is too short, the stability of the second locking structure 520 may be poor; if the distance between the first intersection point 550, the second intersection point 560, and the third intersection point 513 is too long, the rotation of the second locking structure 520 may interfere with the second link 220 or the first swing rod 310. For example, the distance between the first intersection point 550, the second intersection point 560, and the third intersection point 513 of the second locking structure 520 is equal to one-third of the length of the first swing rod 310.

[0072] like Figure 4 and Figure 6 As shown, in some embodiments, the seat frame further includes a back support assembly 700 and a linkage component 800. The back support assembly 700 is rotatably connected to the seat frame mechanism 200. One end of the linkage component 800 is rotatably connected to the second swing rod 320, and the other end is rotatably connected to the back support assembly 700. The back support assembly 700 is used to mount the backrest. The linkage component 800 and the back support assembly 700 rotate synchronously to adjust the angle of the backrest. By driving the back support assembly 700 to rotate synchronously through the linkage component 800, the backrest mounted on the back support assembly 700 rotates synchronously, thereby achieving a change in the angle of the backrest.

[0073] like Figure 4 and Figure 6As shown, in some embodiments, the back support assembly 700 includes a back mounting component 710, a first support rod 720, and a second support rod 730. The back mounting component 710 is used to mount the backrest. One end of the first support rod 720 is rotatably connected to the seat frame mechanism 200, and the other end is rotatably connected to the back mounting component 710. One end of the second support rod 730 is rotatably connected to the seat frame mechanism 200, and the other end is rotatably connected to the back mounting component 710. The first support rod 720 is rotatably connected to a linkage component 800, and a clearance hole 7211 is provided on the first support rod 720. The linkage component 800 is provided with a rotating shaft 821, which passes through the clearance hole 7211 and is rotatably connected to the seat frame mechanism 200.

[0074] The backrest mounting component 710, the first support rod 720, the second support rod 730, and the second connecting rod 220 form a linkage structure. Rotation of the seat frame mechanism 200 drives the linkage component 800 and the first support rod 720 to rotate synchronously, thereby changing the angle of the backrest. The linkage component 800 is rotatably connected to the seat frame mechanism 200 via a rotating shaft 821. Therefore, the linkage component 800 and the backrest support assembly 700 form a unified moving unit. The first swing rod 310 and the linkage component 800 rotate synchronously to drive the second support rod 730 to rotate, thus achieving a change in the backrest angle. Because the backrest's length in the direction from the front to the rear of the seat frame is relatively small, and the backrest is generally set against a wall, the length of the backrest support assembly 700 in the direction from the front to the rear of the seat frame is limited, making interference between the linkage component 800 and the first support rod 720 more likely. The linkage component 800 is rotatably connected to the seat frame mechanism 200 via a rotating shaft 821, and the rotating shaft 821 passes through the clearance hole 7211. Under the premise that both the linkage component 800 and the first support rod 720 are rotatably connected to the first connecting rod 210, the first support rod 720 and the linkage component 800 can be staggered to avoid interference between them.

[0075] like Figure 4 and Figure 6As shown, in some embodiments, the first support rod 720 is rotatably connected to the seat frame mechanism 200 and forms a rotation point 723; the clearance hole 7211 is arc-shaped, and the extension trajectory of the clearance hole 7211 lies on a circle with the rotation point 723 as the center and the distance between the rotation shaft 821 and the rotation point 723 as the radius. That is, the clearance hole 7211 is set along the movement path of the rotation shaft 821 on the first support rod 720, which can reduce the area of ​​the clearance hole 7211 while avoiding the rotation shaft 821, thereby ensuring the supporting force of the first support rod 720. During the rotation of the first support rod 720, the rotation shaft 821 slides in the clearance hole 7211, avoiding interference between the linkage component 800 and the first support rod 720; in addition, the clearance hole 7211 plays a certain guiding role for the rotation shaft 821 as it moves within the clearance hole 7211. The first support rod 720 is provided with a clearance part 721, which extends along the width direction of the first support rod 720. A clearance hole 7211 is provided on the clearance part 721. The clearance part 721 can widen the local width of the first support rod 720 in the width direction. Under the premise of ensuring that there is no interference between the first support rod 720 and the linkage component 800, the material used of the first support rod 720 can be reduced.

[0076] In some embodiments, the first link 210 is provided with a second limiting rod 211 and a third limiting rod 212 spaced apart, and the second support rod 730 moves between the second limiting rod 211 and the third limiting rod 212; the second limiting rod 211 and the third limiting rod 212 respectively abut against the second support rod 730 to limit the range of motion of the second support rod 730; by using the spaced second limiting rod 211 and the third limiting rod 212, the rotation angle of the second support rod 730 can be limited, the movement stroke of the second support rod 730 can be effectively controlled, which is beneficial to changing the angle of the backrest.

[0077] like Figure 7 As shown, in some embodiments, the linkage component 800 includes a first linkage rod 810, a second linkage rod 820, and a third linkage rod 830. One end of the first linkage rod 810 is rotatably connected to the first support rod 720, and the other end is rotatably connected to the second linkage rod 820. The second linkage rod 820 is rotatably connected to the seat frame mechanism 200 via a rotating shaft 821. The end of the second linkage rod 820 away from the first linkage rod 810 is rotatably connected to the third linkage rod 830. The end of the third linkage rod 830 away from the second linkage rod 820 is rotatably connected to the second swing rod 320. The rotation of the second swing rod 320 drives the rotation of the first linkage rod 810, the second linkage rod 820, and the third linkage rod 830, thereby driving the first support rod 720 and the second support rod 730 to rotate synchronously, so as to realize the angle change of the backrest.

[0078] like Figure 4 and Figure 6 As shown, in some embodiments, the second linkage 820 includes a first support rod 822 and a second support rod 823 connected together. The first support rod 822 and the second support rod 823 are bent, and a rotating shaft 821 is connected to the intersection of the first support rod 822 and the second support rod 823. The end of the first support rod 822 away from the rotating shaft 821 is rotatably connected to a third linkage 830, and the second support rod 823 is rotatably connected to the first linkage 810. It can be understood that the second swing rod 320 rotates forward and drives the second linkage 820 to rotate relative to the first connecting rod 210 through the third linkage 830. The second linkage 820 drives the first support rod 720 to rotate through the first linkage 810, thereby changing the angle of the backrest. The bent arrangement of the first support rod 822 and the second support rod 823 allows the rotation of the second linkage 820 to drive the first support rod 720 to rotate within a large angle range, which is beneficial for changing the angle of the backrest.

[0079] like Figure 4 and Figure 6 As shown, in some embodiments, the second link 220 includes a connected transverse section 221 and an inclined section 222, with the end of the inclined section 222 away from the transverse section 221 inclined towards the backrest mounting component 710; the second swing arm 320 is rotatably connected to the inclined section 222, and the fourth link 240 is rotatably connected to the transverse section 221. This arrangement allows the rotation of the first swing arm 310 and the second swing arm 320 to drive the transverse section 221 to rotate within a large angle range, thereby causing the seat cushion to undergo a large angle change.

[0080] like Figure 3 As shown, in some embodiments, the fourth link 240 is rotatably connected to the second link 220 and forms the first connection point 270. The second swing rod 320 is rotatably connected to the second link 220 and forms the second connection point 280. The first connection point 270 is located on the side of the second connection point 280 near the leg extension mechanism 400, so that the seat frame mechanism 200 can be set as close as possible to the front of the seat frame to reserve enough space for the linkage component 800 to move. During the process of the seat frame switching from the TV posture state to the reclining posture state, the third link 230 rotates forward, driving the seat frame mechanism 200 to move forward, so that the seat frame mechanism 200 moves forward. This setting allows enough space to be reserved between the seat frame and the wall, which is convenient for adjusting the backrest angle and helps to achieve zero wall contact with the seat frame.

[0081] like Figure 3As shown, in some embodiments, the seat frame also includes an anti-tilt component 900. One end of the anti-tilt component 900 is rotatably connected to the first swing rod 310, and the other end is slidably provided with a pulley 930. The first swing rod 310 rotates, causing the anti-tilt component 900 to rotate. The pulley 930 abuts against the ground. The anti-tilt component 900 can support the seat frame to ensure the stability of the seat frame in a reclining position. The pulley 930 can reduce the friction between the anti-tilt component 900 and the ground. The anti-tilt component 900 includes an abutment rod 910 and a connecting rod 920; one end of the connecting rod 920 is rotatably connected to the first swing rod 310, and the other end is rotatably connected to the abutment rod 910; one end of the abutment rod 910 is rotatably connected to the base 100, and the other end is rotatably connected to the pulley 930; the abutment rod 910 is curved; the first swing rod 310 rotates, and drives the abutment rod 910 to rotate forward through the connecting rod 920, so that the pulley 930 abuts against the ground.

[0082] In some embodiments, the first connecting rod 210 is a plate, and a reinforcing rib 213 is provided on one side of the first connecting rod 210. The reinforcing rib 213 can improve the structural strength of the first connecting rod 210, thereby improving the support force of the seat frame. The seat frame mechanism 200 also includes a seat cushion mounting member 290, which is connected to the first connecting rod 210 and the reinforcing rib 213. The seat cushion mounting member 290 is used to install the seat cushion, so that the seat cushion is fixed on the seat frame mechanism 200. The reinforcing rib 213 can further support the seat cushion mounting member 290 to ensure the stability of the seat cushion.

[0083] In some embodiments, the seat cushion mounting member 290 includes a first mounting plate 291 and a second mounting plate 292 connected to each other. The first mounting plate 291 is fixed to the first connecting rod 210, so that the seat cushion mounting member 290 is fixed to the first connecting rod 210. The first mounting plate 291 and the second mounting plate 292 are bent to improve the structural strength of the seat cushion mounting member 290.

[0084] A seating arrangement is provided in a second aspect embodiment of the present invention, such as... Figures 1 to 3 As shown, it includes a seat frame as described in any embodiment of the first aspect above.

[0085] In actual implementation, the seat frame can be converted from a sitting position to a TV position. The driving component 600 drives the third link 230 and the leg extension mechanism 400 to rotate, so that the leg extension mechanism 400 extends in front of the first link 210. During this process, the first rod 530 and the second rod 540 of the second locking structure 520 are connected to form a straight line to keep the angle of the seat cushion unchanged. When the leg extension mechanism 400 is fully extended to achieve the TV position of the seat frame, the first mating part 5121 pushes the second mating part 5221 to rotate, so that the first rod 530 and the second rod 540 of the second locking structure 520 are no longer set along the second line Y. The first swing rod 310 and the second swing rod 320 can rotate freely to change the angle of the seat cushion and the backrest, so that the seat frame can be converted from the TV position to a reclining position.

[0086] In addition, the seating also includes a seat cushion, a leg rest, and a backrest. The seat cushion is located on the first link 210, the leg rest is located on the leg extension mechanism 400, and the backrest is located on the back support assembly 700.

[0087] It is understood that if the seat frame has the beneficial effects of the above embodiments, then the seat will have the beneficial effects of the above embodiments accordingly. The specific implementation method can be referred to the above embodiments, and this application will not repeat it.

[0088] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A seating frame, characterized in that, include: Base (100); The seat frame mechanism (200) includes a first link (210), a second link (220), a third link (230), and a fourth link (240); one end of the third link (230) is rotatably connected to the first link (210), and the other end is rotatably connected to the second link (220); one end of the fourth link (240) is rotatably connected to the first link (210), and the other end is rotatably connected to the second link (220); the first link (210) is located above the second link (220), and the first link (210) is used to mount the seat cushion; The swing assembly includes a first swing rod (310) and a second swing rod (320). One end of the first swing rod (310) is rotatably connected to the second connecting rod (220), and the other end is rotatably connected to the base (100). One end of the second swing rod (320) is rotatably connected to the second connecting rod (220), and the other end is rotatably connected to the base (100). Leg extension mechanism (400); A rotating rod (410) is rotatably connected to the third link (230) and the leg extension mechanism (400); the third link (230) and the rotating rod (410) rotate synchronously so that the leg extension mechanism (400) can perform extension and retraction movements; A first locking structure (510) is rotatably connected at one end to the third link (230) and at the other end to the second link (220). The second locking structure (520) has one end rotatably connected to the first swing rod (310) and the other end rotatably connected to the second connecting rod (220). The seat frame has a sitting position, a TV position, and a reclining position. During the switching between the sitting position and the TV position, the third link (230) and the fourth link (240) rotate synchronously, and the second locking structure (520) restricts the first swing rod (310) from rotating relative to the second link (220). During the switching between the TV position and the reclining position, the first swing rod (310) rotates relative to the second link (220), and the first locking structure (510) restricts the third link (230) from rotating relative to the second link (220).

2. The seat frame according to claim 1, characterized in that, When the seat frame switches from a sitting position to a TV position, the first locking structure (510) strikes the second locking structure (520) and restricts the first swing rod (310) from rotating relative to the second link (220) through the second locking structure (520); when the seat frame switches from a reclining position to a TV position, the second locking structure (520) strikes the first locking structure (510) and restricts the third link (230) from rotating relative to the second link (220) through the first locking structure (510).

3. The seat frame according to claim 1, characterized in that, Both the first locking structure (510) and the second locking structure (520) include a first rod (530) and a second rod (540) hinged together. The end of the first rod (530) away from the second rod (540) is rotatably connected to the third link (230) or the first swing rod (310) and forms a first intersection (550). The end of the second rod (540) away from the first rod (530) is rotatably connected to the second link (220) and forms a second intersection (560). When both the first rod (530) and the second rod (540) are arranged along the direction from the first intersection (550) to the second intersection (560), the rotation of the third link (230) or the first swing rod (310) is restricted.

4. The seat frame according to claim 3, characterized in that, The line connecting the first intersection point (550) and the second intersection point (560) of the first locking structure (510) is the first connecting line; when the first rod (530) and the second rod (540) of the first locking structure (510) are both arranged along the direction from the first intersection point (550) to the second intersection point (560), the angle between the first rod (530) of the first locking structure (510) and the first connecting line is less than or equal to the first set angle, and the angle between the second rod (540) of the first locking structure (510) and the first connecting line is less than or equal to the first set angle.

5. The seat frame according to claim 3, characterized in that, The line connecting the first intersection (550) and the second intersection (560) of the second locking structure (520) is the second connecting line; when the first rod (530) and the second rod (540) of the second locking structure (520) are both set along the direction from the first intersection (550) to the second intersection (560), the included angle between the first rod (530) of the second locking structure (520) and the second connecting line is less than or equal to the first set angle, and the included angle between the second rod (540) of the second locking structure (520) and the second connecting line is less than or equal to the first set angle.

6. The seat frame according to claim 3, characterized in that, The first locking structure (510) is provided with a first mating part (5121), and the second locking structure (520) is provided with a second mating part (5221). During the process of the seat frame switching to the TV posture state, the first mating part (5121) impacts the second mating part (5221) or the second mating part (5221) impacts the first mating part (5121).

7. The seat frame according to claim 6, characterized in that, The line connecting the first intersection (550) and the second intersection (560) of the second locking structure (520) is the second connecting line; before the first mating part (5121) strikes the second mating part (5221), the angle between the first rod (530) of the second locking structure (520) and the second connecting line is less than or equal to the first set angle, and the angle between the second rod (540) of the second locking structure (520) and the second connecting line is less than or equal to the first set angle; after the first mating part (5121) strikes the second mating part (5221), the angle between the first rod (530) of the second locking structure (520) and the second connecting line is greater than the first set angle and less than or equal to the second set angle, and the angle between the second rod (540) of the second locking structure (520) and the second connecting line is greater than the first set angle and less than or equal to the second set angle.

8. The seat frame according to claim 7, characterized in that, After the first mating part (5121) strikes the second mating part (5221), the angle between the first rod (530) of the second locking structure (520) and the second connecting line is greater than or equal to a third set angle, and the angle between the second rod (540) of the second locking structure (520) and the second connecting line is greater than or equal to a third set angle.

9. The seat frame according to claim 7, characterized in that, The second locking structure (520) further includes a second elastic element (524), which engages with the first rod (530) and the second connecting rod (220) of the second locking structure (520) respectively. Before the first engaging part (5121) impacts the second engaging part (5221), the second elastic element (524) provides an elastic force to the second locking structure (520) so that the angle between the first rod (530) and the second connecting line of the second locking structure (520) is less than or equal to a first set angle, and the angle between the second rod (540) and the second connecting line of the second locking structure (520) is less than or equal to the first set angle.

10. The seat frame according to claim 9, characterized in that, During the process of the first mating part (5121) striking the second mating part (5221), the first rod (530) of the second locking structure (520) rotates along the first direction; the second elastic member (524) provides an elastic force to the second locking structure (520) so that the first rod (530) of the second locking structure (520) has a tendency to rotate along the second direction; The first direction and the second direction are opposite.

11. The seat frame according to claim 9, characterized in that, The second link (220) is provided with a fixing rod (224). One end of the second elastic member (524) is connected to the fixing rod (224), and the other end is connected to the first rod (530) of the second locking structure (520). The fixing rod (224) is used to abut against the second rod (540) of the second locking structure (520) to restrict the rotation of the second rod (540) of the second locking structure (520).

12. The seat frame according to claim 6, characterized in that, The line connecting the first intersection (550) and the second intersection (560) of the first locking structure (510) is the first connecting line; before the second mating part (5221) strikes the first mating part (5121), the angle between the first rod (530) of the first locking structure (510) and the first connecting line is less than or equal to a first set angle, and the angle between the second rod (540) and the first connecting line is less than or equal to the first set angle; after the second mating part (5221) strikes the first mating part (5121), the angle between the first rod (530) of the first locking structure (510) and the first connecting line is greater than the first set angle and less than or equal to a second set angle, and the angle between the second rod (540) of the first locking structure (510) and the first connecting line is greater than the first set angle and less than or equal to the second set angle.

13. The seat frame according to claim 12, characterized in that, After the second mating part (5221) strikes the first mating part (5121), the angle between the first rod (530) of the first locking structure (510) and the first connecting line is greater than or equal to a third set angle, and the angle between the second rod (540) of the first locking structure (510) and the first connecting line is greater than or equal to a third set angle.

14. The seat frame according to claim 12, characterized in that, The first locking structure (510) further includes a first elastic element (514), which cooperates with the second rod (540) and the third connecting rod (230) of the first locking structure (510) respectively; the first elastic element (514) provides an elastic force to the second rod (540) of the first locking structure (510) so that the angle between the second rod (540) of the first locking structure (510) and the first connecting line is less than or equal to a first set angle.

15. The seat frame according to claim 14, characterized in that, During the process of the second mating part (5221) striking the first mating part (5121), the first rod (530) of the first locking structure (510) rotates along a third direction; the first elastic member (514) provides an elastic force to the first locking structure (510) so that the first rod (530) of the first locking structure (510) has a tendency to rotate along a fourth direction; the third direction is opposite to the fourth direction.

16. The seat frame according to claim 6, characterized in that, In the TV posture state of the seat frame, the first mating part (5121) and the second mating part (5221) abut against each other; in the sitting and reclining posture states of the seat frame, the first mating part (5121) and the second mating part (5221) disengage.

17. The seat frame according to claim 6, characterized in that, The third link (230) is rotatably connected to the second link (220) to form a first hinge point (250), and the first swing rod (310) is rotatably connected to the second link (220) to form a second hinge point (260); the second hinge point (260) is located on the side of the first hinge point (250) away from the leg extension mechanism (400); the second intersection point (560) of the first locking structure (510) is located between the first hinge point (250) and the second hinge point (260); the first mating part (5121) is disposed on the second rod (540) of the first locking structure (510), and the second mating part (5221) is disposed on the first rod (530) of the second locking structure (520).

18. The seat frame according to claim 3, characterized in that, The first swing arm (310) is located at the end of the second link (220) near the third link (230); the second rod (540) of the first locking structure (510) includes a first locking section (511) and a first mating section (512) connected to each other, the first locking section (511) being rotatably connected to the first rod (530) and the second link (220) of the first locking structure (510); the first mating section (512) is located on the side of the first locking section (511) away from the first rod (530), the first mating section (512) being ... 512) The first mating part (5121) is provided; the first rod (530) of the second locking structure (520) includes a second locking section (521) and a second mating section (522) connected to each other. The second locking section (521) is rotatably connected to the second rod (540) and the second connecting rod (220) of the second locking structure (520). The second mating section (522) is located on the side of the second locking section (521) away from the first rod (530). The second mating section (522) is provided with the second mating part (5221).

19. The seat frame according to any one of claims 1 to 18, characterized in that, The first swing arm (310) is provided with a first limiting rod (311), which is used to abut against the second connecting rod (220) to limit the rotation of the first swing arm (310).

20. The seat frame according to any one of claims 1 to 18, characterized in that, The third link (230) is provided with a fourth limiting rod (231), which is used to abut against the first rod (530) of the first locking structure (510) to restrict the rotation of the first rod (530).

21. The seat frame according to any one of claims 1 to 18, characterized in that, The second link (220) is provided with a fifth limiting rod (223), which is used to abut against the fourth link (240) to limit the rotation of the fourth link (240).

22. The seat frame according to claim 6, characterized in that, One of the first mating part (5121) and the second mating part (5221) is a mating groove, and the other is a mating protrusion.

23. The seat frame according to claim 3, characterized in that, The first rod (530) and the second rod (540) of the first locking structure (510) intersect at the third intersection point (513), and the first rod (530) and the second rod (540) of the second locking structure (520) intersect at the fourth intersection point (523). The distances between the first intersection (550) and the second intersection (560) of the first locking structure (510) and the third intersection (513) are both greater than or equal to one-quarter of the length of the third link (230) and less than or equal to one-half the length of the third link (230); and / or, The distances between the first intersection (550) and the second intersection (560) of the second locking structure (520) and the third intersection (513) are all greater than or equal to one-quarter of the length of the first swing rod (310) and less than or equal to one-half the length of the first swing rod (310).

24. The seat frame according to any one of claims 1 to 18, characterized in that, The seat frame also includes a drive component (600), which is disposed on the base (100) and rotatably connected to the seat frame mechanism (200); the drive component (600) is used to drive the third link (230) and the leg extension mechanism (400) to rotate, and also to drive the first swing rod (310) and the second swing rod (320) to rotate.

25. The seat frame according to any one of claims 1 to 18, characterized in that, The seat frame also includes a back support assembly (700) and a linkage component (800). The back support assembly (700) is rotatably connected to the seat frame mechanism (200). One end of the linkage component (800) is rotatably connected to the second swing rod (320), and the other end is rotatably connected to the back support assembly (700). The back support assembly (700) is used to install the backrest. The linkage component (800) and the back support assembly (700) rotate synchronously to adjust the angle of the backrest.

26. The seat frame according to any one of claims 1 to 18, characterized in that, The seat frame also includes an anti-tilt component (900), one end of which is rotatably connected to the first swing rod (310), and the other end is slidably provided with a pulley (930).

27. The seat frame according to claim 26, characterized in that, The anti-tilt component includes an abutment rod (910) and a connecting rod (920); one end of the connecting rod (920) is rotatably connected to the first swing rod (310), and the other end is rotatably connected to the abutment rod (910); one end of the abutment rod (910) is rotatably connected to the base (100), and the other end is rotatably connected to the pulley (930).

28. The seat frame according to any one of claims 1 to 18, characterized in that, The seat frame also includes a back support assembly (700) and a linkage component (800), wherein the back support assembly (700) is rotatably connected to the seat frame mechanism (200); the back support assembly (700) is used to install the backrest; The linkage component (800) is rotatably connected to the seat frame mechanism (200); one end of the linkage component (800) is rotatably connected to the second swing rod (320), and the other end is rotatably connected to the back support assembly (700); the linkage component (800) and the back support assembly (700) rotate synchronously to adjust the angle of the backrest.

29. The seat frame according to claim 28, characterized in that, The back support assembly (700) includes a back mounting component (710), a first support rod (720), and a second support rod (730). The back mounting component (710) is used to mount the backrest. One end of the first support rod (720) is rotatably connected to the seat frame mechanism (200), and the other end is rotatably connected to the back mounting component (710). One end of the second support rod (730) is rotatably connected to the seat frame mechanism (200), and the other end is rotatably connected to the back mounting component (710). The first support rod (720) is rotatably connected to the linkage component (800), and the first support rod (720) is provided with a clearance hole (7211). The linkage component (800) is provided with a rotating shaft (821), and the rotating shaft (821) passes through the clearance hole (7211) and is rotatably connected to the seat frame mechanism (200).

30. The seat frame according to claim 29, characterized in that, The first support rod (720) is rotatably connected to the seat frame mechanism (200) and forms a rotation point (723); the clearance hole (7211) is arc-shaped, and the extension trajectory of the clearance hole (7211) is located on a circle with the rotation point (723) as the center and the distance between the rotation axis (821) and the rotation point (723) as the radius.

31. The seat frame according to claim 29, characterized in that, The first connecting rod (210) is provided with a second limiting rod (211) and a third limiting rod (212) at intervals. The second support rod (730) moves between the second limiting rod (211) and the third limiting rod (212). The second limiting rod (211) and the third limiting rod (212) respectively abut against the second support rod (730) to limit the range of motion of the second support rod (730).

32. The seat frame according to claim 29, characterized in that, The linkage component (800) includes a first linkage rod (810), a second linkage rod (820), and a third linkage rod (830). One end of the first linkage rod (810) is rotatably connected to the first support rod (720), and the other end is rotatably connected to the second linkage rod (820). The second linkage rod (820) is rotatably connected to the seat frame mechanism (200) via the rotating shaft (821). The end of the second linkage rod (820) away from the first linkage rod (810) is rotatably connected to the third linkage rod (830). The end of the third linkage rod (830) away from the second linkage rod (820) is rotatably connected to the second swing rod (320).

33. The seat frame according to claim 32, characterized in that, The second linkage (820) includes a first support rod (822) and a second support rod (823) connected together. The first support rod (822) and the second support rod (823) are bent. The rotating shaft (821) is connected at the intersection of the first support rod (822) and the second support rod (823). The end of the first support rod (822) away from the rotating shaft (821) is rotatably connected to the third linkage (830), and the second support rod (823) is rotatably connected to the first linkage (810).

34. The seat frame according to claim 29, characterized in that, The second link (220) includes a transverse section (221) and an inclined section (222) connected to each other. The end of the inclined section (222) away from the transverse section (221) is inclined toward the back mounting component (710). The second swing rod (320) is rotatably connected to the inclined section (222), and the fourth link (240) is rotatably connected to the transverse section (221).

35. The seat frame according to any one of claims 1 to 18, characterized in that, The fourth link (240) is rotatably connected to the second link (220) to form a first connection point (270), and the second swing arm (320) is rotatably connected to the second link (220) to form a second connection point (280). The first connection point (270) is located on the side of the second connection point (280) close to the leg extension mechanism (400).

36. The seat frame according to any one of claims 1 to 18, characterized in that, The first connecting rod (210) is a plate, and a reinforcing rib (213) is provided on one side of the first connecting rod (210); the seat frame mechanism (200) also includes a seat cushion mounting component (290), which is connected to the first connecting rod (210) and the reinforcing rib (213) and is used to install the seat cushion.

37. A seating arrangement, characterized in that, Includes the seat frame as described in any one of claims 1 to 36.

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