Leg centering support structure and seat support

Abstract

The application relates to a leg-centralized support structure and a seat support, which comprises a leg assembly and a transmission assembly, the transmission assembly is used for being connected between two side seat assemblies of a seat, the transmission assembly comprises a driving cross rod and a transmission cross rod; the leg assembly comprises a leg transmission rod and a leg driving rod, the leg transmission rod is connected between two end portions of the transmission cross rod, and the leg driving rod is connected between two end portions of the driving cross rod; the middle portion of the driving cross rod is used for being connected with an output end of a driving assembly, and rotates to move forward or backward under the driving of the driving assembly to drive the leg assembly to stretch or retract. The leg-centralized support structure hides the leg assembly in the middle, can avoid the leg assembly from being clamped to foreign matters during stretching or retraction, the overall structure of the seat is stronger, and the safety of the seat is improved, and the appearance of the seat is more beautiful.

Description

Technical Field

[0001] This invention relates to the field of sofa support technology, and in particular to a leg-centered support structure and a seat support. Background Technology

[0002] As people's living standards improve, functional sofas and chairs are becoming increasingly common in daily life. Functional chairs include recliners, armchairs, sofas, sectional seating, theater seats, and seating units with movable seats. Functional chairs with telescopic mechanisms can be adjusted between sitting, relaxing, and reclining positions.

[0003] Existing seating units have the following drawbacks: traditional iron frame legs need to be connected to the sides and side panels to move, and they are not detachable. After being wrapped in the sofa, the movement and structure of the legs can be fully seen from the side. The color of the legs does not match the overall color of the sofa. There is a risk of pinching hands when the legs extend and retract on the side. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, the present invention aims to provide a leg-centered support structure and a seat support. The leg component is detachably mounted on the transmission component, and the leg component moves in a centered position, eliminating the risk of pinching the hand during movement. After installation, the structure of the leg component is not visible from the side of the seat, resulting in a stronger overall seat structure and a more aesthetically pleasing appearance.

[0005] To address the aforementioned problems, in a first aspect, the present invention provides a leg centering support structure, comprising a leg assembly and a transmission assembly, wherein the transmission assembly is used to connect between the two side seat assemblies of a seat, and the transmission assembly includes a drive crossbar and a transmission crossbar.

[0006] The leg assembly includes a leg transmission rod and a leg drive rod. The leg transmission rod is connected between the two ends of the transmission crossbar, and the leg drive rod is connected between the two ends of the drive crossbar. The middle part of the drive crossbar is used to connect to the output end of the drive assembly and rotates forward or backward under the drive of the drive assembly to drive the leg assembly to extend and retract.

[0007] Furthermore, the transmission crossbar is arranged parallel to the drive crossbar and close to the front end of the seat assembly. The transmission crossbar is connected to the leg transmission rod at a first fixed point, and the drive crossbar is connected to the leg drive rod at a second fixed point.

[0008] Furthermore, the leg assembly also includes a first intermediate rod and a second intermediate rod;

[0009] The first intermediate rod is hinged to the leg drive rod. The second intermediate rod is provided with a first hinge point and a second hinge point. The second intermediate rod is hinged to the leg drive rod at the first hinge point. The second intermediate rod is cross-hinged to the middle of the leg drive rod at the second hinge point. The line connecting the first hinge point, the second hinge point, the first fixed point, and the second fixed point forms a quadrilateral.

[0010] Furthermore, the angle between the line connecting the first fixed point and the second fixed point and the horizontal plane is not less than 0°.

[0011] Furthermore, a limiting member is provided on the second intermediate rod, and a first limiting surface that cooperates with the limiting member is provided on the lower edge of the leg transmission rod. When the first limiting surface abuts against the limiting member, the current position of the leg assembly is the limit position of the leg assembly's extension.

[0012] Furthermore, the vertical distance from the plane where the second intermediate rod is located to the inner side of the seat frame of the seat assembly on both sides is not less than 150mm.

[0013] Furthermore, the leg assembly also includes a main footrest, with the ends of the first intermediate rod and the second intermediate rod away from the leg transmission rod and the leg drive rod respectively hinged to the main footrest.

[0014] Furthermore, the leg assembly also includes a secondary footrest and a footrest link. The secondary footrest is hinged to the main footrest, and one end of the footrest link is hinged to the middle of the secondary footrest, while the other end is hinged to the first intermediate rod.

[0015] In a second aspect, the present invention also provides a seat bracket, including a seat assembly and the aforementioned leg-centered support structure. The seat assembly includes a seat frame, a first leg connecting rod, a second leg connecting rod, and a seat linkage assembly. The seat linkage assembly is rotatably connected between the seat frame and the seat armrest, and the seat linkage assembly is used to support and drive the seat frame to move relative to the seat armrest.

[0016] One end of the first connecting leg is hinged to the front end of the seat frame at the first endpoint, and the other end is connected to the transmission crossbar at the second endpoint; one end of the second connecting leg is hinged to the front end of the seat frame at the third endpoint, and the other end is connected to the drive crossbar at the fourth endpoint, and the line connecting the first endpoint, the second endpoint, the fourth endpoint and the third endpoint forms a quadrilateral.

[0017] Furthermore, the seat linkage assembly includes a seat frame linkage assembly, which includes a first connecting frame rod, an intermediate linkage member, and a second connecting frame rod that are hinged sequentially.

[0018] The first connecting rod and the second connecting rod are both hinged to the seat frame, and the first connecting rod, the intermediate linkage, the second connecting rod and the seat frame form a four-bar linkage mechanism.

[0019] Furthermore, the seat assembly also includes a leg linkage, one end of which is hinged to the second leg linkage and the other end of which is hinged to the intermediate linkage member.

[0020] Furthermore, the seat linkage assembly also includes a translation linkage assembly and a side plate mounting component. The translation linkage assembly is rotatably connected between the seat frame linkage assembly and the side plate mounting component, and the side plate mounting component is used to connect with the seat armrest.

[0021] Furthermore, the translation linkage assembly includes a first rocker arm, a first intermediate link, a second intermediate link, and a second rocker arm;

[0022] The first rocker arm and the second rocker arm are both hinged to the side plate mounting member, and the first intermediate connecting rod and the second intermediate connecting rod are hinged between the first rocker arm and the second rocker arm.

[0023] Furthermore, the translation linkage assembly also includes a first connecting rod and a second connecting rod. One end of the first connecting rod is hinged to the first rocker arm, and the other end is hinged to the intermediate linkage member. One end of the second connecting rod is hinged to the first intermediate connecting rod and the second rocker arm, respectively, and the other end is hinged to the intermediate linkage member.

[0024] Due to the above technical solution, the present invention has the following beneficial effects:

[0025] The leg assembly of this invention is connected to the transmission assembly and is located between the two side seat assemblies of the seat in the middle of the seat frame. The leg assembly is away from the side of the seat to avoid interference with the side seat assemblies and to avoid the risk of foreign objects or hands being pinched during the extension and retraction process, thus improving safety.

[0026] The four-bar extension structure of the leg assembly of this invention is located below the transmission assembly. When the seat is subjected to force, the double crossbar structure of the transmission assembly has better stability and support, which can prevent the leg assembly from deforming under force. Moreover, the leg assembly is centrally hidden under the seat bracket, so that the structure and movement of the leg assembly are completely invisible from the side of the seat. The finished seat has a stronger overall structure and a more beautiful appearance.

[0027] The connection between the leg assembly and the crossbar transmission assembly facilitates the installation, positioning, and disassembly of the leg assembly. Disassembling the leg assembly further facilitates the packaging and transportation of the seat frame. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the present invention, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the seat bracket according to an embodiment of the present invention;

[0030] Figure 2 This is a top view of the seat bracket according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the extended posture of the seat bracket according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the seat bracket in an embodiment of the present invention in a reclining position.

[0033] Figure 5 This is a structural schematic diagram of the translation link assembly and side plate mounting component according to an embodiment of the present invention;

[0034] Figure 6 This is a side view of the seat bracket according to an embodiment of the present invention.

[0035] In the attached drawings, the reference numerals are as follows: 1-Leg assembly, 11-Leg transmission rod, 12-Leg drive rod, 13-First intermediate rod, 14-Second intermediate rod, 15-Main footrest, 16-Secondary footrest, 17-Footrest connecting rod, 111-First limiting surface, 121-Second limiting surface, 141-First hinge point, 142-Second hinge point, 143-Limiting member, 2-Transmission assembly, 21-Drive crossbar, 22-Transmission crossbar, 221-First fixing point, 211-Second fixing point, 3-Seat assembly, 31-Seat frame, 32-First connecting leg rod, 33-Second connecting leg rod, 34-Seat linkage assembly, 321-First end point, 322-Second end point, 331-First... Three endpoints, 332-fourth endpoint, 341-seat frame linkage assembly, 3411-first connecting rod, 3412-intermediate linkage component, 3413-second connecting rod, 342-translational linkage assembly, 343-side plate mounting component, 3421-first rocker arm, 3422-first intermediate connecting rod, 3423-second intermediate connecting rod, 3424-second rocker arm, 3425-first connecting rod, 3426-second connecting rod, 35-leg linkage rod, 4-drive assembly, 41-linear push component, 42-rotating shaft, 5-linkage component, 6-drive fixing rod, 7-backrest assembly, 71-backrest mounting component, 72-seat frame connection part, 73-backrest connecting component, 74-backrest limiting component. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the invention. In the description of the invention, it should be understood that the terms "upper," "lower," "front," "rear," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Example

[0040] In this embodiment, the seat can be adjusted between sitting, extended, and reclining positions. The first adjustment stage is from sitting to extended position, and the second adjustment stage is from extended to reclining position. In the first adjustment stage, the seat back angle remains essentially constant, and the leg assembly extends forward to its maximum position. In the second adjustment stage, the leg assembly and seat frame tilt upwards, the seat back rotates backward, and the angle between the backrest and seat frame increases until the final reclining position is achieved. In this embodiment, the area between two opposing seat assemblies, i.e., the opposite sides of the two seat frames, is the "inner" side, and the opposite direction is the "outer" side. The direction in which the leg assembly extends is "forward," and the opposite direction is "backward."

[0041] like Figure 1-6 As shown, this embodiment provides a leg-centered support structure, including a leg assembly 1 and a transmission assembly 2. The transmission assembly 2 is used to connect between the two side seat assemblies 3 of the seat. The transmission assembly 2 includes a drive crossbar 21 and a transmission crossbar 22. The leg assembly 1 includes a leg transmission rod 11 and a leg drive rod 12. The leg transmission rod 11 is connected between the two ends of the transmission crossbar 22, and the leg drive rod 12 is connected between the two ends of the drive crossbar 21. The middle part of the drive crossbar 21 is used to connect to the output end of the drive assembly 4, and rotates forward or backward under the drive of the drive assembly 4 to drive the leg assembly 1 to extend and retract.

[0042] Specifically, in this embodiment, the seat assembly 3 consists of two sets, arranged opposite each other at both ends of the transmission assembly 2. The leg assembly 1 is a single set, positioned in the middle or near the middle of the transmission assembly 2 to centrally support the legs and maintain stable force and support on both sides. The leg assembly 1 is located away from the seat assembly 3 on the side of the seat, avoiding interference with the side seat assembly 3 during extension and retraction. Furthermore, the centrally positioned leg assembly prevents the user from touching the leg assembly located under the seat cushion after the footrest and seat upholstery are installed, thus avoiding the risk of foreign objects or hands being pinched during extension and retraction, and improving safety.

[0043] Specifically, the transmission crossbar 22 is arranged parallel to the drive crossbar 21 and close to the front end of the seat assembly 3. The drive crossbar 21 has a second fixing point 211, and the transmission crossbar 22 has a first fixing point 221. The transmission crossbar 22 is connected to the leg transmission rod 11 at the first fixing point 221, and the drive crossbar 21 is connected to the leg drive rod 12 at the second fixing point 211. Figure 6As shown, the angle between the line connecting the first fixed point 221 and the second fixed point 211 and the horizontal plane is not less than 0°. Preferably, it can be an angle of 15°, 20°, 25°, 28°, 30°, 33°, 35° or somewhere in between. In this embodiment, the angle between the line connecting the first fixed point 221 and the second fixed point 211 and the horizontal plane is 28°. The two fixed points of the transmission assembly 2 and the leg assembly 1 are not on the same horizontal plane, so that when driven, the transmission assembly 2 can smoothly extend and retract the leg assembly 1 diagonally forward without interfering with the seat frame.

[0044] In this embodiment, the drive crossbar 21 is used to rotate forward or backward under the drive of the drive assembly 4, and drives the transmission crossbar 22 to move and the leg assembly 1 to extend or retract through the connection structure between the leg assembly 1 and the transmission crossbar 22. In this embodiment, the transmission assembly 2 is detachably installed with the leg assembly 1 at the first fixed point 221 and the second fixed point 211 by fasteners such as bolts, nuts, screws or rivets. The double crossbar transmission assembly 2, located between the two seat assemblies, has better stability and structural strength. When the seat is under force, the double crossbar transmission assembly located at the front end of the seat frame also has a supporting function, which can prevent the seat cushion from sinking and causing excessive deformation of the leg assembly. The connection between the leg assembly 1 and the crossbar transmission assembly makes it easier to install, position and disassemble the leg assembly. The leg assembly and the transmission assembly can be left unassembled at the factory, and the small seat bracket after disassembling the leg assembly is easier to package and transport.

[0045] Specifically, the leg assembly 1 also includes a first intermediate rod 13 and a second intermediate rod 14. The first intermediate rod 13 is hinged to the leg transmission rod 11. The second intermediate rod 14 is provided with a first hinge point 141 and a second hinge point 142. The second intermediate rod 14 is hinged to the leg drive rod 12 at the first hinge point 141. The second intermediate rod 14 is cross-hinged to the middle of the leg transmission rod 11 at the second hinge point 142. The line connecting the first hinge point 141, the second hinge point 142, the first fixing point 221, and the second fixing point 211 forms a quadrilateral. Specifically, the leg transmission rod 11, leg drive rod 12, first intermediate rod 13, and second intermediate rod 14 of the leg assembly 1 are cross-hinged telescopic linkage structures. The quadrilateral telescopic structure formed by the lines connecting the first hinge point 141, the second hinge point 142, the first fixed point 221, and the second fixed point 211 allows the leg assembly 1 to extend or retract relative to the transmission assembly 2. The telescopic structure is simple and the movement is smooth. The quadrilateral telescopic structure is located below the transmission assembly 2. When the seat is under force, the double crossbar structure of the transmission assembly has better stability and support, and it can also prevent the leg assembly from deforming under force.

[0046] Specifically, a limiting member 143 is provided on the second intermediate rod 14, and a first limiting surface 111 that cooperates with the limiting member 143 is provided on the lower edge of the leg drive rod 11. When the first limiting surface 111 abuts against the limiting member 143, the current position of the leg assembly 1 is the limit position of the leg assembly 1's extension. A second limiting surface 121 is provided on the edge of the leg drive rod 12. When the second limiting surface 121 abuts against the limiting member 143, the current position of the leg assembly 1 is the limit position of the leg assembly 1's retraction. The limiting member 143 cooperates with the first limiting surface 111 or the second limiting surface 121 to limit and prevent the footrest from loosening. On the one hand, it can limit and prevent the leg assembly 1 from over-extending or retracting, making it unable to retract or unfold smoothly; on the other hand, it can prevent the footrest and foot plate from easily loosening if they are not retracted to the predetermined limit position. Specifically, as Figure 2 As shown, the vertical distance H from the plane of the second intermediate rod 14 to the inner side of the seat frame 31 of both side seat assemblies 3 is not less than 150mm. Preferably, it can be 150mm, 170mm, 180mm, 185mm, 190mm, 200mm, or a distance in between. In this embodiment, the vertical distance from the plane of the second intermediate rod to the inner side of one side seat frame 31 is 178mm. The vertical distance from the plane of the second intermediate rod to the inner side of the seat frame 31 on both sides of the seat limits the specific position of the leg assembly 1 in the transmission assembly 2 to the middle or near the middle. When the seat is in use, the pressure direction of the leg assembly is located in the middle of the seat, so the central placement of the leg assembly is beneficial to maintaining the balance of the seat support.

[0047] Specifically, such as Figure 3 As shown, the leg assembly 1 also includes a main footrest 15. The ends of the first intermediate rod 13 and the second intermediate rod 14, away from the leg transmission rod 11 and the leg drive rod 12, are respectively hinged to the main footrest 15. The leg assembly 1 also includes a secondary footrest 16 and a footrest connecting rod 17. The secondary footrest 16 is hinged to the main footrest 15, and one end of the footrest connecting rod 17 is hinged to the middle of the secondary footrest 16, while the other end is hinged to the first intermediate rod 13. In this embodiment, the main footrest 15 is used to connect with the main footrest of the seat, and the secondary footrest 16 is used to connect with the secondary footrest of the seat. In the sitting position, the secondary footrest 16 drives the secondary footrest to fold and retract under the leg assembly. During the first adjustment stage of adjusting the seat from a sitting position to a stretched position, and the second adjustment stage of adjusting to a reclining position, the secondary footrest 16 extends to the front of the main footrest 15.

[0048] This embodiment also provides a seat bracket, including a seat assembly 3 and a leg centering bracket structure. The seat assembly 3 includes a seat frame 31, a first leg connecting rod 32, a second leg connecting rod 33, and a seat linkage assembly 34. The seat linkage assembly 34 is rotatably connected between the seat frame 31 and the seat armrest. The seat linkage assembly 34 is used to support and drive the seat frame 31 to move relative to the seat armrest. One end of the first leg connecting rod 32 is hinged to the front end of the seat frame 31 at the first endpoint 321, and the other end is connected to the transmission crossbar 22 at the second endpoint 322. One end of the second leg connecting rod 33 is hinged to the front end of the seat frame 31 at the third endpoint 331, and the other end is connected to the drive crossbar 21 at the fourth endpoint 332. The line connecting the first endpoint 321, the second endpoint 322, the fourth endpoint 332, and the third endpoint 331 forms a quadrilateral. Specifically, the two ends of the transmission component 2 form two quadrilateral telescopic structures with the seat frame 31, the first leg rod 32 and the second leg rod 33 respectively, which cooperate with the quadrilateral telescopic structure formed by the middle part of the transmission component 2 and the leg component 1 to realize the telescopic movement of the leg component between the sitting and lying positions.

[0049] In this embodiment, the installation height of the first endpoint 321 and the third endpoint 331 is lower than the seat frame mounting surface on the seat frame 31, avoiding interference between the first connecting leg 32 and the second connecting leg 33 and the seat frame mounting surface during rotation. The distance from the first endpoint 321 to the second endpoint 322 and the distance from the third endpoint 331 to the fourth endpoint 332 are both 60mm-80mm, preferably 60mm, 65mm, 70mm, 80mm or somewhere in between. In this embodiment, the distances from the first endpoint 321 to the second endpoint 322 and the third endpoint 331 to the fourth endpoint 332 satisfy the rotation space of the first connecting leg 32 and the second connecting leg 33, while also helping to reduce the space occupied by the support structure in the vertical direction.

[0050] Specifically, such as Figure 4 and 5 As shown, the seat linkage assembly 34 includes a seat frame linkage assembly 341, which includes a first connecting rod 3411, an intermediate linkage member 3412, and a second connecting rod 3413 that are hinged together in sequence. The first connecting rod 3411 and the second connecting rod 3413 are both hinged to the seat frame 31, and the first connecting rod 3411, the intermediate linkage member 3412, the second connecting rod 3413, and the seat frame 31 form a four-bar linkage mechanism.

[0051] Specifically, the seat assembly 3 also includes a leg linkage 35, one end of which is hinged to the second leg linkage 33, and the other end is hinged to the intermediate linkage 3412. The leg linkage 35 is used to connect the leg assembly 1 and the seat linkage assembly 34. In this embodiment, when the leg assembly 1 extends forward, it simultaneously drives the seat frame 31 and the seat linkage assembly 34 to move forward. In the first adjustment stage, the intermediate linkage 3412 remains stationary, and the seat frame 31, through the rotation of the first connecting frame rod 3411 and the second connecting frame rod 3413, translates forward with the extension of the leg assembly 1 until the leg assembly 1 is fully extended.

[0052] Specifically, the seat linkage assembly 34 further includes a translation link assembly 342 and a side plate mounting member 343. The translation link assembly 342 is rotatably connected between the seat frame linkage assembly 341 and the side plate mounting member 343, and the side plate mounting member 343 is used to connect with the seat armrest. The translation link assembly 342 includes a first rocker arm 3421, a first intermediate link 3422, a second intermediate link 3423, and a second rocker arm 3424. The first rocker arm 3421 and the second rocker arm 3424 are both hinged to the side plate mounting member 343, and the first intermediate link 3422 and the second intermediate link 3423 are hinged between the first rocker arm 3421 and the second rocker arm 3424.

[0053] Specifically, the translation linkage assembly 342 further includes a first connecting rod 3425 and a second connecting rod 3426. One end of the first connecting rod 3425 is hinged to the first rocker arm 3421, and the other end is hinged to the intermediate linkage member 3412. One end of the second connecting rod 3426 is hinged to the first intermediate connecting rod 3422 and the second rocker arm 3424, respectively, and the other end is hinged to the intermediate linkage member 3412. In the second adjustment stage, the seat frame linkage assembly 341 tilts forward and translates upward through the movement of the translation linkage assembly 342.

[0054] Specifically, in this embodiment, the seat bracket also includes a backrest assembly 7, which is rotatably connected between the seat frame 31 and the side panel mounting member 343. The backrest assembly 7 is used to connect with the seat back to adjust the seat back angle. The backrest assembly 7 includes a backrest mounting member 71, a seat frame connecting part 72, a backrest connector 73, and a backrest limiting member 74. The middle part of the seat frame connecting part 72 is connected to the seat frame 31, and the two ends of the seat frame connecting part 72 are respectively hinged to the backrest mounting member 71 and the backrest limiting member 74. One end of the backrest connector 73 is hinged to the middle part of the backrest mounting member 71, and the other end is hinged to the backrest limiting member 74. The backrest limiting member 74 is hinged to the rear end of the side panel mounting member 343 through a connecting rod. During the second adjustment stage, the leg assembly and the seat frame as a whole tilt upward. As the seat frame connecting part 72 tilts upward with the seat frame 31, the backrest limiting member 74 and the backrest connector 73 drive the backrest mounting member 71 to rotate backward.

[0055] Specifically, a drive fixing rod 6 is provided at the rear end of the side plate mounting member 343 of the seat linkage assembly 34, and the drive assembly 4 is disposed between the drive crossbar 21 and the drive fixing rod 6. The drive assembly 4 includes a linear pusher 41, and a connecting rod 5 is provided in the middle of the drive crossbar 21. The linear pusher 41 is rotatably connected to the connecting rod 5 through a rotating shaft 42. The linear pusher 41 can be a linear slider or a push rod. In this embodiment, the drive assembly 4 is a push rod motor, and the linear pusher 41 is a linear push rod. The motor end of the drive assembly 4 is connected to the middle of the drive fixing rod 6. The motor of the drive assembly 4 drives the linear pusher 41 to extend and retract, thereby driving the transmission assembly 2, the leg assembly 1, the seat assembly 3, and the backrest assembly 7 to move. In other embodiments, the drive assembly 4 can be a slider motor, and the linear pusher 41 can be a linear slider. Driven by the drive component 4, the seat unit in this embodiment can achieve three positions: sitting, extended, and reclining. In the sitting position, both the leg assembly 1 and the backrest assembly are retracted to their limit positions. In the extended position, the leg assembly 1 extends forward to its limit position, and the angle between the backrest assembly and the seat frame 31 remains the same as in the sitting position. In the reclining position, the leg extension assembly extends to its limit position, and the backrest assembly rotates backward to its limit position.

[0056] This embodiment also provides a seat, including a seat back, a seat armrest and a seat bracket. The seat bracket is fixedly connected to the inner side of the seat armrest via side plate mounting parts 343 on both sides, and the seat back is connected to the backrest assembly 7 of the seat bracket.

[0057] The seat frame with the leg assembly of this embodiment can be applied to seats with floor-standing armrests. Existing sofas with floor-standing armrests are mostly used in home and business settings, requiring high standards for structural stability, appearance, and safety. In this embodiment, the leg assembly is connected to the transmission assembly and positioned in the middle of the seat frame. When the seat is under stress, the double crossbar structure of the transmission assembly provides better stability and support, preventing the seat cushion from sinking and causing deformation of the leg assembly. In this embodiment, the leg assembly structure is difficult to observe and touch from either side of the seat, effectively avoiding the risk of the leg assembly trapping foreign objects or hands during movement. Furthermore, during extension and retraction, the leg assembly is centrally hidden under the seat frame, resulting in a more integrated and aesthetically pleasing finished seat. The connection between the leg assembly and the crossbar transmission assembly facilitates the installation, positioning, and disassembly of the leg assembly, and disassembling the leg assembly makes packaging and transportation of the seat frame easier.

[0058] The foregoing description has fully disclosed the specific embodiments of the present invention. It should be noted that any modifications made to the specific embodiments of the present invention by those skilled in the art do not depart from the scope of the claims. Accordingly, the scope of the claims is not limited to the foregoing specific embodiments.

Claims

1. A leg-centered support structure, characterized in that, It includes a leg assembly (1) and a transmission assembly (2), the transmission assembly (2) being used to connect between the two side seat assemblies (3) of the seat, the transmission assembly (2) including a drive crossbar (21) and a transmission crossbar (22). The leg assembly (1) includes a leg transmission rod (11) and a leg drive rod (12). The leg transmission rod (11) is connected between the two ends of the transmission crossbar (22), and the leg drive rod (12) is connected between the two ends of the drive crossbar (21). The transmission crossbar (22) is arranged parallel to the drive crossbar (21) and close to the front end of the seat assembly (3). The transmission crossbar (22) is connected to the leg transmission rod (11) at the first fixed point (221), and the drive crossbar (21) is connected to the leg drive rod (12) at the second fixed point (211). The leg assembly (1) also includes a first intermediate rod (13) and a second intermediate rod (14). The angle between the line connecting the first fixed point (221) and the second fixed point (211) and the horizontal plane is not less than 0°. The first intermediate rod (13) is hinged to the leg drive rod (11), and the second intermediate rod (14) is provided with a first hinge point (141) and a second hinge point (142). The second intermediate rod (14) is hinged to the leg drive rod (12) at the first hinge point (141), and the second intermediate rod (14) is cross-hinged to the middle of the leg drive rod (11) at the second hinge point (142). The line connecting the first hinge point (141), the second hinge point (142), the first fixed point (221), and the second fixed point (211) forms a quadrilateral. The middle part of the drive crossbar (21) is used to connect to the output end of the drive assembly (4) and rotates forward or backward under the drive of the drive assembly (4) to drive the leg assembly (1) to extend and retract.

2. The leg-centered support structure according to claim 1, characterized in that, The second intermediate rod (14) is provided with a limiting member (143), and the lower edge of the leg transmission rod (11) is provided with a first limiting surface (111) that cooperates with the limiting member (143). When the first limiting surface (111) abuts against the limiting member (143), the current position of the leg assembly (1) is the limit position of the extension of the leg assembly (1).

3. The leg-centered support structure according to claim 1, characterized in that, The vertical distance from the plane where the second intermediate rod (14) is located to the inner side of the seat frame (31) of the seat assembly (3) on both sides is not less than 150mm.

4. The leg-centered support structure according to claim 1, characterized in that, The leg assembly (1) further includes a main footrest (15), wherein the ends of the first intermediate rod (13) and the second intermediate rod (14) away from the leg transmission rod (11) and the leg drive rod (12) are respectively hinged to the main footrest (15).

5. A leg-centered support structure according to claim 4, characterized in that, The leg assembly (1) further includes a secondary footrest (16) and a footrest link (17). The secondary footrest (16) is hinged to the main footrest (15). One end of the footrest link (17) is hinged to the middle of the secondary footrest (16), and the other end is hinged to the first intermediate rod (13).

6. A seat bracket, characterized in that, The seat assembly (3) includes a seat component (3) and a leg centering support structure as described in any one of claims 1-5. The seat component (3) includes a seat frame (31), a first leg link (32), a second leg link (33), and a seat linkage component (34). The seat linkage component (34) is rotatably connected between the seat frame (31) and the seat armrest. The seat linkage component (34) is used to support and drive the seat frame (31) to move relative to the seat armrest. One end of the first connecting rod (32) is hinged to the seat frame (31) at the first endpoint (321), and the other end is connected to the transmission crossbar (22) at the second endpoint (322); one end of the second connecting rod (33) is hinged to the front end of the seat frame (31) at the third endpoint (331), and the other end is connected to the drive crossbar (21) at the fourth endpoint (332). The line connecting the first endpoint (321), the second endpoint (322), the fourth endpoint (332) and the third endpoint (331) forms a quadrilateral.

7. A seat bracket according to claim 6, characterized in that, The seat linkage assembly (34) includes a seat frame linkage assembly (341), which includes a first connecting frame rod (3411), an intermediate linkage member (3412), and a second connecting frame rod (3413) that are hinged in sequence. The first connecting rod (3411) and the second connecting rod (3413) are both hinged to the seat frame (31). The first connecting rod (3411), the intermediate linkage (3412), the second connecting rod (3413) and the seat frame (31) form a four-bar linkage mechanism.

8. A seat bracket according to claim 7, characterized in that, The seat assembly (3) also includes a leg linkage (35), one end of which is hinged to the second leg linkage (33), and the other end is hinged to the intermediate linkage (3412).

9. A seat bracket according to claim 8, characterized in that, The seat linkage assembly (34) further includes a translation linkage assembly (342) and a side plate mounting member (343). The translation linkage assembly (342) is rotatably connected between the seat frame linkage assembly (341) and the side plate mounting member (343). The side plate mounting member (343) is used to connect with the seat armrest.

10. A seat bracket according to claim 9, characterized in that, The translation link assembly (342) includes a first rocker arm (3421), a first intermediate link (3422), a second intermediate link (3423), and a second rocker arm (3424). The first rocker arm (3421) and the second rocker arm (3424) are both hinged to the side plate mounting member (343), and the first intermediate connecting rod (3422) and the second intermediate connecting rod (3423) are hinged between the first rocker arm (3421) and the second rocker arm (3424).

11. A seat bracket according to claim 10, characterized in that, The translation link assembly (342) further includes a first connecting rod (3425) and a second connecting rod (3426); One end of the first connecting rod (3425) is hinged to the first rocker arm (3421), and the other end is hinged to the intermediate linkage (3412). One end of the second connecting rod (3426) is hinged to the first intermediate connecting rod (3422) and the second rocker arm (3424), and the other end is hinged to the intermediate linkage (3412).

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