Three position frame structure for electric seat

Abstract

The present application relates to the technical field of smart home, and especially relates to a three-posture frame structure for an electric seat, which comprises a base, a hip support assembly, a leg telescopic frame connected to the front end of the hip support assembly, a back support frame connected to the rear end of the hip support assembly, a connecting rod support assembly connected between the base and the hip support assembly, and a driving device for sequentially transforming or reversely sequentially transforming the three-posture frame structure between a sitting posture, a TV posture and a lying posture, wherein the transformation between the sitting posture and the TV posture is realized through shape change of the leg telescopic frame, the transformation between the TV posture and the lying posture is realized through shape change of the connecting rod support assembly, movement of the hip support assembly, movement of the leg telescopic frame in the maximum extension state, and shape change and movement of the back support frame. Through the design of the posture transformation mechanism, the present application can solve the problems of difficult assembly and poor stability of the corresponding structure, and improve the comfort and practicability of the electric seat in posture transformation.

Description

Technical Field

[0001] This invention relates to the field of smart home technology, and in particular to a three-position frame structure for electric seats. Background Technology

[0002] Existing technologies offer a variety of electric seats, and as living standards improve, people's expectations for the comfort of electric seats are gradually increasing. Among known designs, electric seats with multiple posture options and relatively rich functionality provide users with a superior experience in various usage scenarios.

[0003] In related technologies, such as Chinese invention patent with publication number CN111955974A, published on November 20, 2020, a zero-wall-gap linkage mechanism with an electric seat driver is disclosed. It includes a base, a pair of seat mounting plates, and a plurality of first links and a plurality of second links. Each of the plurality of first links and the plurality of second links is pivotally connected between the base and the seat mounting plates to movably connect the base and the seat mounting plates to each other, thereby controlling the movement of the seat unit between closed, TV, reclined and fully reclined positions.

[0004] However, the above linkage mechanism adopts a multi-structure linkage method and is achieved through a relatively complex rod connection method during the process of different posture transformations. This structural form makes product assembly difficult on the one hand, and is prone to structural shaking and jamming during use on the other hand. Summary of the Invention

[0005] This invention provides a three-position frame structure for electric seats, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A three-position frame structure for an electric seat includes: a base; a hip support assembly disposed above the base, wherein a leg extension frame is connected to the front end of the hip support assembly and a back support frame is connected to the rear end of the hip support assembly; a linkage support assembly connected between the base and the hip support assembly; and a drive device for driving the three-position frame structure to sequentially change between sitting, TV, and reclining positions or in reverse sequentially. The transition between the sitting posture and the TV posture is achieved by changing the shape of the leg extension frame; The transition between the TV posture and the lying posture is achieved synchronously through the shape change of the linkage support assembly, the movement of the hip support assembly, the movement of the leg extension frame in its maximum extended state, and the shape change and movement of the back support frame.

[0007] Furthermore, the linkage support assembly includes two sets of four-bar linkage structures symmetrically arranged on the left and right sides of the hip support assembly; The four-bar linkage includes a first link, a second link, a third link, and a fourth link that are rotatably connected end to end. The first link is fixedly connected to the base, the third link is fixedly connected to the hip support assembly, and the fourth link is located on the side of the leg telescopic frame. The shape change of the link support assembly is achieved through the movement of the third link and the rotation of the second and fourth links relative to the first link.

[0008] Furthermore, the linkage support assembly also includes at least one spring installed inside the annulus enclosed by the four-bar linkage structure, the spring providing tension to resist the expansion of the annulus's internal area.

[0009] Furthermore, the driving device is a linear driving device that outputs driving force to the leg telescopic frame. When extended, it drives the three-position frame structure to change sequentially between the sitting, TV, and lying positions. When shortened, it drives the three-position frame structure to change sequentially in the opposite direction.

[0010] Furthermore, the tension of the spring satisfies: Under set load conditions, during the transition from the lying position to the TV position, the pulling force is applied to the leg extension frame through the third link and the hip support assembly, so that the leg extension frame remains in its maximum extended state.

[0011] Furthermore, one end of the spring is connected to the first connecting rod, and the other end is connected to the third or fourth connecting rod, with the connection position located on the side near the rotational connection point of the third and fourth connecting rods.

[0012] Furthermore, the back support frame includes two sets of two-bar structures symmetrically arranged on the left and right sides of the hip support assembly, and each set of two-bar assemblies is correspondingly connected to a set of four-bar structures; The two-bar linkage includes a fifth link and a sixth link that are rotatably connected; the third link includes a first extension that is rotatably connected to the fifth link, and the second link includes a second extension that is rotatably connected to the sixth link; The four-bar linkage structure drives the fifth and sixth links to synchronously change shape and move through the first and second extension sections.

[0013] Furthermore, the leg telescopic frame includes two sets of telescopic support frames symmetrically arranged on the left and right sides of the hip support assembly; The telescopic support frame includes a first support rod, a second support rod, a third support rod, a fourth support rod, a first mounting base, and a second mounting base; The first support rod and the second support rod are connected in an X-shaped cross rotation, forming four branches around the rotation connection point; Two branches on one side form a four-bar linkage structure that is rotatably connected to the third support rod and the first mounting base in sequence; two branches on the other side form a four-bar linkage structure that is rotatably connected to the fourth support rod and the second mounting base in sequence. The first mounting base is fixedly connected to the support plate that supports the legs, and the second mounting base is fixedly connected to the hip support assembly.

[0014] Furthermore, the hip support assembly includes a frame and several serpentine springs; The frame includes two parallel side bars and two parallel cross bars perpendicular to the side bars; The side bar is fixedly connected to the leg telescopic frame and the connecting rod support assembly; The crossbar is fixedly connected to the end of the serpentine spring.

[0015] Furthermore, the drive device includes an electric push rod and a connecting rod; One end of the electric push rod is rotatably connected to the base, and the other end is rotatably connected to the connecting rod. The length direction of the connecting rod is perpendicular to the power output direction of the electric push rod. The two ends of the connecting rod are respectively fixedly connected to the two sets of telescopic support frames.

[0016] The technical solution of this invention can achieve the following technical effects: This invention, through the design of a posture transformation mechanism, can solve the drawbacks of difficult assembly and poor stability of the current corresponding structure, and also improves the comfort and practicality of the electric seat during posture transformation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of one side of the three-attitude frame structure, and the other side is a mirror image showing only the part excluding the drive device; Figure 2 This is a schematic diagram showing the transformation of a local part of the three-pose frame structure between the seated and TV poses. Figure 3 This is a schematic diagram showing the transformation of a local part of the three-pose frame structure between the TV pose and the lying pose. Figure 4 This is a schematic diagram of the assembly of the linkage support assembly; Figure 5 A schematic diagram showing the connection between the leg extension frame and back support frame and the hip support assembly and base. Figure 6 for Figure 5 Test chart; Figure 7 A schematic diagram showing the connection between the back support frame and the linkage support assembly; Figure 8 This is a schematic diagram of the assembly of the back support frame and the linkage support assembly. Figure 9 for Figure 8 A magnified view of a section at point A in the middle; Figure 10 for Figure 8 A magnified view of a section at point B in the middle; Figure 11 This is a structural diagram of the leg extension frame; Figure 12 This is a schematic diagram of one side of the three-attitude frame structure, and the other side is a mirror image showing part excluding the drive device, including the support plate; Figure 13 This is a schematic diagram showing the leg extension frame and back support frame in a retracted state relative to the hip support component and the base. Figure 14 This is an exploded view of one side of the three-pose frame structure. Figure 15 This is a schematic diagram of one side of the hip support component; the other side is a mirror image of the portion shown. Figure 16 This is a schematic diagram of the drive unit's installation. Figure label: 10. Base; 20. Hip support assembly; 21. Snake spring; 22. Side bar; 23. Crossbar; 30. Leg extension frame; 31. First support rod; 31a. First branch; 31b. Second branch; 32. Second support rod; 32a. Third branch; 32b. Fourth branch; 33. Third support rod; 34. Fourth support rod; 35. First mounting base; 36. Second mounting base; 37. Support plate; 40. Back support frame; 41. Fifth link; 41a. First connection point; 42. Sixth link; 42a. Second connection point; 50. Linkage support assembly; 51. First link; 52. Second link; 52a. Second extension; 53. Third link; 53a. First extension; 54. Fourth link; 55. Spring; 60. Drive unit; 61. Electric push rod; 62. Connecting rod. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] like Figures 1-16 As shown, the three-position frame structure for an electric seat includes: a base 10; a hip support assembly 20 disposed above the base 10, with a leg extension frame 30 connected to the front end of the hip support assembly 20 and a back support frame 40 connected to the rear end of the hip support assembly 20; a linkage support assembly 50 connected between the base 10 and the hip support assembly 20; and a drive device 60 that drives the three-position frame structure to sequentially change between sitting, TV, and reclining positions or vice versa.

[0021] In an embodiment of the present invention, see Figure 2 The transition between sitting and TV-like postures is achieved through the shape change of the leg extension frame 30. Figure 2 The solid lines in the figure illustrate the shape change of the leg telescopic frame 30 between its retracted and extended states. In this embodiment of the invention, the shape change refers to the overall shape of the leg telescopic frame 30 as a whole, primarily caused by the change in the relative positional relationship between the rigid components of the leg telescopic frame 30 under the drive of the drive device 60. Of course, when the leg telescopic frame 30 uses elastic elements such as springs, the shape change of the elastic elements themselves is also included. During this process, the other parts shown by the dashed lines in the figure remain unchanged. And, see also Figure 3 The transition between the TV posture and the lying posture is achieved simultaneously through the shape change of the linkage support component 50, the movement of the hip support component 20, the movement of the leg extension frame 30 in its maximum extended state, and the shape change and movement of the back support frame 40. Figure 3The solid lines in the figure illustrate the shape changes of the linkage support assembly 50 between different support states, as well as the simultaneous shape changes and movements of the back support frame 40. In embodiments of the present invention, the shape changes here refer to the linkage support assembly 50 and the back support frame 40 as a whole. Specifically, they refer to the changes in the overall shape of the linkage support assembly 50 and the back support frame 40, and the movement of the back support frame 40, caused by the change in the relative positional relationship between the rigid components of the linkage support assembly 50 and the back support frame 40 under the drive of the drive device 60. Of course, when elastic elements such as springs are used, the shape changes of the elastic elements themselves are also included. During this process, the hip support assembly 20 and the leg extension frame 30, shown by dashed lines in the figure, only move relative to the base 10 and do not undergo shape changes.

[0022] In the above embodiments of the present invention, the transformation between sitting and TV postures, and between TV postures and lying postures, are divided into two independent stages, with the former being the first stage and the latter the second stage. For example, the leg extension frame 30 only undergoes shape changes in the first stage, and reaches its maximum extension state in the second stage, thus generating movement. This method allows for relative independence, reducing the number of complex rods and connection points required by traditional multi-structure linkages, thereby significantly reducing product assembly difficulty and improving production efficiency. The linkage support assembly 50 only undergoes shape changes in the second stage; the hip support assembly 20 only generates movement in the second stage; and the back support frame 40 only undergoes shape changes and movement in the second stage. In the second stage, the changes in each structure occur synchronously. Because some structures only move without shape changes, the swaying and jamming problems caused by loose or asynchronous rod connections can be effectively avoided, making posture transitions smoother and more stable.

[0023] As a preferred embodiment of the above, such as Figure 4 As shown, the linkage support assembly 50 includes two sets of four-bar linkage structures symmetrically arranged on the left and right sides of the hip support assembly 20; The four-bar linkage includes a first link 51, a second link 52, a third link 53, and a fourth link 54 that are rotatably connected end to end. The first link 51 is fixedly connected to the base 10, and the third link 53 is fixedly connected to the hip support assembly 20. The fourth link 54 is located on the side where the leg telescopic frame 30 is located. The shape change of the link support assembly 50 is achieved by the movement of the third link 53 and the rotation of the second link 52 and the fourth link 54 relative to the first link 51.

[0024] In this preferred embodiment, the third link 53 can be used as the active structure for deformation generation, while the second link 52 and the fourth link 54 can be used as passive structures for deformation generation. In this way, the deformation of the link support assembly 50 can be achieved by the drive device 60 directly or indirectly driving the third link 53 to move. The four-link structure is simple and easy to process and assemble. During the overall assembly of the three-position frame structure, the link support assembly 50 can be pre-assembled to obtain a pre-assembled structure.

[0025] Without considering the advantages of the pre-assembled structure described above, in embodiments of the present invention, a partial structure of the hip support assembly 20 may be used as the third link 53, and / or a partial structure of the base 10 may be used as the first link 51. This approach offers advantages in material cost, and both the pre-assembled and pre-assembled methods are within the scope of protection of the present invention.

[0026] As a preferred embodiment of the above, such as Figures 5-7 As shown, the linkage support assembly 50 also includes at least one spring 55 installed inside the annulus enclosed by the four-bar linkage structure. The spring 55 provides tension to resist the expansion of the annulus's internal area. In embodiments of the invention, the spring 55 makes the process of the four-bar linkage structure decreasing in area smoother.

[0027] As a preferred embodiment of the above, from the perspective of power optimization, the drive device 60 is a linear drive device that outputs driving force to the leg telescopic frame 30. When extended, it drives the three-position frame structure to sequentially change between sitting, TV, and lying positions; when shortened, it drives the three-position frame structure to sequentially change in the opposite direction. In this way, the action switching process of the three-position frame structure can be realized by a single power source. Specifically, it can include: providing telescopic power to the leg telescopic frame 30, and providing motion power to the leg telescopic frame 30 in its maximum extended state. Through the connection relationship between the leg telescopic frame 30 and the hip support component 20, and the connection relationship between the hip support component 20 and the third link 53, it indirectly provides the link support component 50 with the force to achieve shape change.

[0028] Based on the implementation of the drive device 60 applying force to the leg telescopic frame 30, in an embodiment of the present invention, as a further preferred embodiment, the tension of the spring 55 satisfies: Under the set load conditions, during the transition from the lying position to the TV position, the pulling force is applied to the leg extension frame 30 through the third link 53 and the hip support component 20, so that the leg extension frame 30 is kept in the maximum extension state.

[0029] In an embodiment of the present invention, the load condition specifically refers to the user being in a relaxed lying position with the back, buttocks and legs applying natural pressure to the three-position frame structure, and the user's weight range being within the product's load-bearing range.

[0030] In the above embodiments, spring 55 is given the function of further optimizing the user experience. Specifically, when spring 55 only needs to improve the smoothness of movement, the requirement for tension is relatively low. However, in this preferred embodiment, a higher requirement for tension is proposed, thereby aiming to solve the following problems: See also Figures 5-7 Since the drive device 60 directly applies force to the leg extension frame 30, when changing from a lying position to a TV position, if the spring 55 is not provided, or the tension of the spring 55 is insufficient, based on the set load conditions, the user's gravity will exert force, causing the hip support component 20 and the back support frame 40 to maintain their original angle posture, while the leg extension frame 30 will fall first under the action of the drive device 60. In the prior art, in the lying position, the angle between the back support frame 40 and the hip support component 20 is larger than in the TV position, and the leg extension frame 30 will also be raised further upwards compared to the TV position, so that the height of the highest point of the leg extension frame 30 relative to the horizontal plane is greater than the height of the highest point of the back support frame 40 relative to the horizontal plane. In the embodiment of the present invention, when the above usage requirements are met, the user's lower legs will fall first along with the leg extension frame 30, which often affects the comfort of use in the lying position. In the absence of spring 55 or with insufficient tension, to avoid the above situation, the user needs to manually control the center of gravity to ensure that the legs remain in the same position as the lying position when changing from the lying position to the TV position.

[0031] In this application, by setting a spring 55 and limiting its tension, the above-mentioned action process can be optimized without the user actively changing their center of gravity. In the embodiment of the present invention, the tension is applied to the leg extension frame 30 through the third link 53 and the hip support component 20, so that the leg extension frame 30 maintains its maximum extension state. The reason is that during the change from the lying position to the TV position, the leg extension frame 30 is subjected to the combined action of the tension of the linear drive device when it shortens, in addition to gravity, and the pressure from the hip support component 20. The pressure of the hip support component 20 ultimately comes from the tension of the spring 55. When the tension is sufficient, the movement of the hip support component 20 can completely adapt to the retraction of the linear drive device, without relying on the shape change of the leg extension frame 30. The leg extension frame 30 maintains its maximum extension state under the resultant force of all forces and moves synchronously with the hip support component 20.

[0032] As a preferred embodiment of the above, one end of the spring 55 is connected to the first link 51, and the other end is connected to the third link 53 or the fourth link 54, with the connection position located on the side near the rotational connection point of the third link 53 and the fourth link 54.

[0033] See Figure 7 The figure illustrates a specific arrangement of springs 55. In the embodiment shown, two springs 55 are used. The first end of the bottom of the left spring 55 is connected to the first connecting rod 51, with the connection position near the middle of the first connecting rod 51. The second end is connected to the fourth connecting rod 54, with the connection position near the side where the rotational connection point with the third connecting rod 53 is located. The first end of the bottom of the right spring 55 is connected to the first connecting rod 51, with the connection position near the end of the first connecting rod 51 located on the side where the second connecting rod 52 is located. The second end is connected to the third connecting rod 53, with the connection position near the end of the third connecting rod 53 located on the side where the fourth connecting rod 54 is located. Through this preferred arrangement, the tension of the spring 55 can obtain a larger torque, making the process of reducing the inner area of ​​the ring smoother.

[0034] As a preferred embodiment of the above, such as Figures 8-10 As shown, the back support frame 40 includes two sets of two-bar structures symmetrically arranged on the left and right sides of the hip support assembly 20, and each set of two-bar assemblies is connected to a set of four-bar structures. The two-bar linkage includes a fifth link 41 and a sixth link 42 that are rotatably connected; the third link 53 includes a first extension 53a that is rotatably connected to the fifth link 41, and the second link 52 includes a second extension 52a that is rotatably connected to the sixth link 42. The four-bar linkage structure drives the fifth link 41 and the sixth link 42 to synchronously change shape and move through the first extension section 53a and the second extension section 52a.

[0035] In an embodiment of the present invention, based on the above connection relationship, the third link 53 can drive the first connection point 41a with the fifth link 41 to move during the movement, and the second link 52 can drive the second connection point 42a with the sixth link 42 to move during the rotation. With the movement of the first connection point 41a and the second connection point 42a and the change in their relative position relationship, the fifth link 41 and the sixth link 42 move synchronously and produce an angle change.

[0036] Based on the above principles of motion, the shape of each link can be adaptively designed. (See also...) Figure 9 In the embodiment shown in the figure, the first connection point 41a in the use state is located above the second connection point 42a, and the fifth link 41 is located above the sixth link 42. Therefore, the fifth link 41 is connected to the structure that supports the back, and the fifth link 41 is designed as an L-shape. The two ends of one side of the L-shaped structure are connected to the third link 53 and the sixth link 42 respectively, and the other side of the L-shaped structure is connected to the structure that supports the back. By controlling the included angle between the two sides of the L-shaped structure, the included angle between the human back and the legs can be adjusted.

[0037] As a preferred embodiment of the above, see Figure 11 and 12 The leg telescopic frame 30 includes two sets of telescopic support frames symmetrically arranged on the left and right sides of the hip support assembly 20; the telescopic support frame includes a first support rod 31, a second support rod 32, a third support rod 33, a fourth support rod 34, a first mounting base 35, and a second mounting base 36.

[0038] The first support rod 31 and the second support rod 32 are connected in an X-shaped cross rotation, forming four branches around the rotation connection point; specifically as follows: Figure 11 The first support rod 31 has a first branch 31a and a second branch 31b, and the second support rod 32 has a third branch 32a and a fourth branch 32b. Two branches on one side form a four-bar linkage structure that is rotatably connected to the third support rod 33 and the first mounting base 35 in sequence, and two branches on the other side form a four-bar linkage structure that is rotatably connected to the fourth support rod 34 and the second mounting base 36 in sequence. That is, the first branch 31a, the third branch 32a, the third support rod 33 and the first mounting base 35 are rotatably connected in sequence to form a quadrilateral structure, and the second branch 31b, the fourth branch 32b, the second mounting base 36 and the fourth support rod 34 are rotatably connected in sequence to form a quadrilateral structure. The first mounting base 35 is fixedly connected to the support plate 37 that supports the legs, and the second mounting base 36 is fixedly connected to the hip support assembly 20.

[0039] In the above embodiments of the present invention, the deformation of the telescopic support frame is specifically a synchronous change process of two quadrilateral structures, see below. Figure 11 When the included angle α at the top of the X-shaped cross structure in the diagram increases, the area enclosed by the two quadrilateral structures decreases simultaneously, resulting in a greater extension length. Conversely, when the included angle α decreases, the areas of the two quadrilateral structures will sequentially increase and then decrease from their maximum extension state, thus achieving the desired effect. Figure 13 The storage state shown above, based on the above process, can be achieved by reasonably controlling the size and shape of each support rod, so that the leg telescopic frame 30 in the storage state is completely placed between the hip support component 20 and the base 10. This state can also be used as a packaging and transportation state, thereby achieving the best packaging and transportation costs with a smaller volume.

[0040] In an embodiment of the present invention, during the overall assembly of the three-posture frame structure, the leg telescopic frame 30 can be pre-assembled to obtain a pre-assembled structure. Without considering the advantages of the pre-assembled structure, in an embodiment of the present invention, a partial structure of the hip support component 20 can also be used as the second mounting base 36. This method offers advantages in material cost, and both the pre-assembly method and the pre-assembled method are within the scope of protection of the present invention.

[0041] like Figure 14As shown, in a preferred embodiment of the present invention, the base 10, hip support assembly 20, leg telescopic frame 30, back support frame 40, connecting rod support assembly 50 and drive device 60 all adopt independent modular structures, and each modular structure is pre-assembled before the whole assembly is performed.

[0042] As a preferred embodiment of the above, the hip support assembly 20 includes a frame and several serpentine springs 21; the frame includes parallel side rods 22 and two parallel crossbars 23 perpendicular to the side rods 22; the side rods 22 are fixedly connected to the leg telescopic frame 30 and the connecting rod support assembly 50; the crossbars 23 are fixedly connected to the ends of the serpentine springs 21. This structure is simple, easy to manufacture, and facilitates connection with other structures. Figure 14 and 15 As shown, one side of the hip support component 20 is displayed, and the other side is a partial mirror image.

[0043] As a preferred embodiment of the above, the driving device 60 includes an electric push rod 61 and a connecting rod 62; one end of the electric push rod 61 is rotatably connected to the base 10, and the other end is rotatably connected to the connecting rod 62, the length direction of the connecting rod 62 is perpendicular to the power output direction of the electric push rod 61; both ends of the connecting rod 62 are fixedly connected to two sets of telescopic support frames respectively.

[0044] like Figure 1 , 12 Figures 14 and 16 show one side of the base 10, with the other side being a mirror image of the shown portion. They also show one side of the drive unit 60, with the other side being a mirror image of the shown portion excluding the electric actuator 61. Through the connection rod 62, power supply to both sets of telescopic support frames can be simultaneously achieved via one electric actuator 61. Figure 16 The figure shows an embodiment in which the end of the connecting rod 62 is connected to the fourth branch 32b. In other embodiments of the present invention, the end of the connecting rod 62 may also be fixedly connected to other parts of the telescopic support frame. Under the premise of satisfying the operating principle of the present invention, all connection methods are within the protection scope of the present invention.

[0045] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A three-position frame structure for electric seats, comprising: Base; A hip support component is disposed above the base. The front end of the hip support component is connected to a leg telescopic frame, and the rear end of the hip support component is connected to a back support frame. A linkage support assembly is connected between the base and the hip support assembly; a drive device drives the three-posture frame structure to sequentially change between sitting, TV, and lying postures or in reverse sequentially. Its features are: The transition between the sitting posture and the TV posture is achieved by changing the shape of the leg extension frame; The transition between the TV posture and the lying posture is achieved simultaneously through the shape change of the linkage support assembly, the movement of the hip support assembly, the movement of the leg extension frame in its maximum extended state, and the shape change and movement of the back support frame. The linkage support assembly includes two sets of four-bar structures symmetrically arranged on the left and right sides of the hip support assembly; The four-bar linkage includes a first link, a second link, a third link, and a fourth link that are rotatably connected end to end. The first link is fixedly connected to the base, and the third link is fixedly connected to the hip support assembly. The fourth link is located on the side where the leg telescopic frame is located. The shape change of the link support assembly is achieved by the movement of the third link and the rotation of the second and fourth links relative to the first link. The back support frame includes two sets of two-bar structures symmetrically arranged on the left and right sides of the hip support component, and each set of two-bar structures is connected to a set of four-bar structures. The two-bar linkage includes a fifth and a sixth link that are rotatably connected; the third link includes a first extension that is rotatably connected to the fifth link, and the second link includes a second extension that is rotatably connected to the sixth link; the four-bar linkage drives the fifth and sixth links to synchronously change shape and move through the first and second extensions.

2. The three-position frame structure for an electric seat according to claim 1, characterized in that, The linkage support assembly also includes at least one spring installed inside the annulus enclosed by the four-bar linkage structure, the spring providing tension to resist the expansion of the annulus's internal area.

3. The three-position frame structure for an electric seat according to claim 2, characterized in that, The driving device is a linear driving device that outputs driving force to the leg telescopic frame. When extended, it drives the three-position frame structure to change sequentially between the sitting, TV, and lying positions. When shortened, it drives the three-position frame structure to change sequentially in the opposite direction.

4. The three-position frame structure for an electric seat according to claim 3, characterized in that, The tension of the spring satisfies: Under set load conditions, during the transition from the lying position to the TV position, the pulling force is applied to the leg extension frame through the third link and the hip support assembly, so that the leg extension frame remains in its maximum extended state.

5. The three-position frame structure for an electric seat according to claim 4, characterized in that, One end of the spring is connected to the first link, and the other end is connected to the third or fourth link, with the connection position located on the side close to the rotational connection point of the third and fourth links.

6. The three-position frame structure for an electric seat according to claim 1, characterized in that, The leg telescopic frame includes two sets of telescopic support frames symmetrically arranged on the left and right sides of the hip support assembly; The telescopic support frame includes a first support rod, a second support rod, a third support rod, a fourth support rod, a first mounting base, and a second mounting base; The first support rod and the second support rod are connected in an X-shaped cross rotation, forming four branches around the rotation connection point; Two branches on one side form a four-bar linkage structure that is rotatably connected to the third support rod and the first mounting base in sequence; two branches on the other side form a four-bar linkage structure that is rotatably connected to the fourth support rod and the second mounting base in sequence. The first mounting base is fixedly connected to the support plate that supports the legs, and the second mounting base is fixedly connected to the hip support assembly.

7. The three-position frame structure for an electric seat according to claim 6, characterized in that, The hip support assembly includes a frame and several serpentine springs; The frame includes two parallel side bars and two parallel cross bars perpendicular to the side bars; The side bar is fixedly connected to the leg telescopic frame and the connecting rod support assembly; The crossbar is fixedly connected to the end of the serpentine spring.

8. The three-position frame structure for an electric seat according to claim 6, characterized in that, The drive device includes an electric push rod and a connecting rod; One end of the electric push rod is rotatably connected to the base, and the other end is rotatably connected to the connecting rod. The length direction of the connecting rod is perpendicular to the power output direction of the electric push rod. The two ends of the connecting rod are respectively fixedly connected to the two sets of telescopic support frames.

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