Electric adjustable seat frame body structure

Abstract

The invention belongs to the technical field of intelligent furniture, and particularly relates to an electric adjustable seat frame body structure. The seat frame body comprises an armrest plate frame, a backup plate frame, parallelogram frame bodies and a leg supporting plate arranged on the parallelogram frame body at the forefront, and further comprises a rear rotating piece unit which is hinged to an upper transverse plate of the armrest plate frame and is provided with the backup plate frame, the rear rotating piece unit is hinged to the upper transverse plate and fixedly connected with the parallelogram frame body, the middle driving frame body unit is hinged to the upper transverse plate and fixedly connected with the rearmost parallelogram frame body, the front rotating piece is hinged to the upper transverse plate and fixedly connected with the rearmost parallelogram frame body, and the hinged linkage pieces are arranged on the rear rotating piece unit and the middle driving frame body unit.

Description

Technical Field

[0001] This application belongs to the technical field of intelligent furniture, and particularly relates to an electrically adjustable seat frame structure. Background Art

[0002] Common existing seats mainly consist of a frame and a soft package in terms of their structural composition. Among them, the former can be further divided into a seat board, a backrest board, and an armrest board.

[0003] Among them, the above-mentioned seat board can be either a plate structure or a frame structure. When it is the latter, the seat board soft package can provide the corresponding plate support function, and the same applies to the above-mentioned backrest board and armrest board.

[0004] On the other hand, for a seat with a relatively comfortable use experience, its frame structure also includes a leg rest board. Moreover, this leg rest board generally has a telescopic function. When it is in the idle state, it retracts under the seat board for later use. Correspondingly, when it is in the use state, it extends to the outside of the seat board. At this time, the user generally lies in a reclined position. Therefore, the extension action of the leg rest board and the tilting and reclining action of the backrest board are generally linked.

[0005] The power source for achieving the above-mentioned linkage effect is generally a cylinder or an electric cylinder. The specific structure for achieving the above-mentioned linkage effect generally includes multiple articulated structures to ensure that the leg rest board can rotate and extend outwards at the same time, and finally be in an inclined state consistent with the reclined backrest board. When the leg rest board is in the retracted idle state, it is generally in a vertical state, thereby covering the originally exposed space between the two armrest boards and under the backrest board, improving the overall appearance of the seat.

[0006] For example, the Chinese utility model patent with the authorization announcement number CN211354648U and the authorization announcement date of August 28, 2020, discloses a mechanical stretching device for a movable sofa, and its structural composition mainly includes: a footrest assembly board, a second leg connecting rod, an assembly side plate, a rotating part, an anti-torsion mounting part, a protection part, a backrest mounting board, a rear support connecting rod, a bottom connecting rod, and a side connecting rod part, etc.

[0007] The advantages of the mechanical stretching device in this utility model patent are mainly: optimizing the part shape of the mechanical stretching device of the movable sofa, reducing the step height of the parts, reducing the number of steps of the parts, and making the part connection method and the limiting method more reasonable.

[0008] However, during the actual use process of this mechanical stretching device, there are at least the following impractical problems, and the specific manifestations are mainly: the structure is too complex, with 77 characteristic marks, so the failure rate is significantly increased, and the use and maintenance costs are relatively high. Summary of the Invention

[0009] This application provides an electrically adjustable seat frame structure. The technical problem to be solved is: how to effectively implement the leg rest board-backrest linkage function of the seat frame in a simpler, more efficient and lower-cost manner.

[0010] The technical solution adopted by this application to solve the above problems is: an electrically adjustable seat frame structure, including an armrest board frame, a backrest board frame, a parallelogram frame body, and a leg rest board arranged on the frontmost parallelogram frame body, and further including a rear rotation piece unit of the backrest board frame hinged to the upper cross board of the armrest board frame, a middle drive frame body unit hinged to the upper cross board and fixedly connected to the middle part of the rearmost parallelogram frame body, a front rotation piece hinged to the upper cross board and fixedly connected to the rearmost parallelogram frame body, and a hinged linkage piece arranged on the rear rotation piece unit and the middle drive frame body unit.

[0011] A further preferred technical solution lies in: the rear rotation piece unit includes a parallelogram component piece with two ends respectively hinged to the upper cross board and the hinged linkage piece, and a backrest board frame mounting piece arranged on the parallelogram component piece.

[0012] A further preferred technical solution lies in: the middle drive frame body unit includes an extension piece with one end arranged on the rearmost parallelogram frame body, and a driven piece with two ends respectively hinged to the upper cross board and the extension piece and provided with the hinged linkage piece.

[0013] A further preferred technical solution lies in: the front rotation piece and the extension piece are respectively fixedly connected to two adjacent plate bodies on the rearmost parallelogram frame body.

[0014] A further preferred technical solution lies in: the middle drive frame body unit further includes a cylinder mounting hole arranged on the driven piece.

[0015] A further preferred technical solution lies in: it further includes two downward protruding plate units arranged on the upper cross board and used for increasing the horizontal distance between the leg rest board and the armrest board frame, and the vertical distance between the leg rest board and the upper cross board. One of the downward protruding plate units is used for hinging the rear rotation piece unit, and the other downward protruding plate unit is used for hinging the middle drive frame body unit and the front rotation piece.

[0016] A further preferred technical solution lies in: the downward protruding plate unit includes a vertical plate fixedly connected to the upper cross board, and two mounting holes arranged on the vertical plate.

[0017] A further preferred technical solution lies in: on one of the mounting holes on the rear vertical plate, an elastic damping rope connecting the hinged linkage piece is provided.

[0018] A further preferred technical solution lies in that: the articulated linkage piece is further provided with a press-deformation convex section with a circular arc-shaped cross section for increasing its own structural strength.

[0019] A further preferred technical solution lies in that: a threaded section is provided on the inner ring surface of the press-deformation convex section, and a threaded post for connecting the elastic damping rope and adjusting the initial elastic strength of the elastic damping rope is provided on the threaded section.

[0020] The beneficial effects of the present application include at least the following three points.

[0021] First, on the premise of effectively realizing the linkage between the backrest plate and the leg rest plate, the seat frame has the outstanding characteristics of simple structure, low production and use costs, and low failure rate.

[0022] Second, the above-mentioned linkage function of the seat frame can be either electrically adjustable or adjusted after the backrest plate is manually pressed down, thereby improving its practicality.

[0023] Third, the elastic tensioning effect provided by the elastic damping rope is applicable to both the above-mentioned electrically adjustable method and the manually pressing method, and the elastic tensioning strength itself can also be adjusted as needed. Description of the Drawings

[0024] Figure 1 It is a schematic position diagram of the rear rotating piece unit, the middle driving frame unit and the front rotating piece in the present application.

[0025] Figure 2 It is a schematic structural diagram of the present application.

[0026] Figure 3 It is a schematic position and shape diagram of the dual-purpose connecting rod and the driving connecting rod in the present application.

[0027] Figure 4 It is a schematic diagram of the retracted and idle state of the leg rest plate in the present application, at this time the backrest plate is in a relatively vertical state.

[0028] Figure 5 It is a schematic diagram of the extended and in-use state of the leg rest plate in the present application, at this time the backrest plate is in a relatively reclined state.

[0029] Figure 6 It is a schematic structural diagram of the rear rotating piece unit, the middle driving frame unit and the front rotating piece in the present application.

[0030] Figure 7 It is a schematic cross-sectional shape diagram of the press-deformation convex section in the present application.

[0031] Figure 8 It is a schematic position diagram of the socket ring in the present application.

[0032] Figure 9 This is a schematic diagram of the installation method of the elastic damping rope in this application.

[0033] Figure 10 This is a schematic diagram of a shape of the leg rest bottom plate and the footrest soft package in this application.

[0034] In the figure, the meanings of the respective marks are as follows.

[0035] Armrest plate frame 21, backrest frame 22, parallelogram frame body 23, leg rest plate 24, cylinder 25, upper cross plate 21-1, leg rest bottom plate 26, footrest soft package 27; Rear rotating piece unit 1, middle driving frame body unit 2, front rotating piece 3, articulated linkage piece 4, press-deformed protruding section 4-1, downward protruding plate unit 5, elastic damping rope 6, threaded post 7, socket ring 8, dual-purpose connecting rod 9, driving connecting rod 10, mounting connecting rod 11; Parallelogram component piece 101, backrest frame mounting piece 102; Extension piece 201, driven piece 202, cylinder mounting hole 203; Vertical plate 501, mounting hole 502. Specific embodiments

[0036] The following is only a preferred embodiment of this application, and does not limit the scope of this application.

[0037] As Figures 1 - 10 shown, an electrically adjustable seat frame structure includes an armrest plate frame 21, a backrest frame 22, a parallelogram frame body 23, and a leg rest plate 24 provided on the frontmost parallelogram frame body 23, and further includes a rear rotating piece unit 1 hingedly provided on the upper cross plate of the armrest plate frame 21 and provided with the backrest frame 22, a middle driving frame body unit 2 hingedly provided on the upper cross plate and fixedly connected to the rearmost parallelogram frame body 23, a front rotating piece 3 hingedly provided on the upper cross plate and fixedly connected to the rearmost parallelogram frame body 23, and an articulated linkage piece 4 provided on the rear rotating piece unit 1 and the middle driving frame body unit 2.

[0038] In this embodiment, this seat belongs to the type of sofa chair and has the following two usage states: First, corresponding to the "chair" state, at this time the backrest is relatively vertical, and the leg rest plate 24 retracts and is idle. Specifically, reference can be made to the appendix Figure 4 ; Second, corresponding to the "sofa" state, at this time the backrest is relatively laid down, and the leg rest plate 24 extends for use. Specifically, reference can be made to the appendix Figure 5 ;

[0039] Correspondingly, the backrest and the leg rest plate 24 are linked together, and the structure for realizing this linkage effect mainly includes: 1 driving connecting rod 10, 2 rear rotating piece units 1, 2 middle driving frame units 2, 2 front rotating pieces 3, 2 articulated linkage pieces 4, and, for example, 2 - 4 parallelogram frames 23. Therefore, the seat frame has the advantages of simple structure, efficient linkage method, and low production and use costs.

[0040] Among them, the above-mentioned linkage effect can be either electrically adjustable or manually adjustable, as long as the driving connecting rod 10 can be shifted forward and backward and remain fixed after the shift. A cylinder 25, an electric cylinder, and various existing mechanical structures convenient for the above-mentioned manual operation can be installed at the driving connecting rod 10, such as pads with different lengths, widths, and heights.

[0041] On the other hand, the frame structure of this seat mainly includes: 2 armrest plate frames 21, 1 backrest frame 22, 2 leg rest plates 24, 1 dual-purpose connecting rod 9, and 2 - 5 mounting connecting rods 11. For details, please refer to the appendix Figure 2 . Among them, the main material of the frame structure is high-strength steel.

[0042] Specifically, in this embodiment, the "rear" position refers to one side of the backrest frame 22, and the opposite side is the "front". For example, the unfolding and using method of the leg rest plate 24 is to extend forward while rotating, so that the side with the soft package installed on it is switched from the previous substantially vertical state to an inclined upward state, thereby being used to support the legs and feet of the user.

[0043] The structural principle of the above "extending forward while rotating" is generally as follows: The cylinder 25 is installed on the dual-purpose connecting rod 9, and its direct acting part is the driving connecting rod 10. When the cylinder shaft of the cylinder 25 extends, it can drive the middle driving frame unit 2 and the front rotating piece 3 to rotate forward together. Therefore, for the parallelogram frame 23, its overall position moves forward and its lateral dimension becomes larger. Therefore, the leg rest plate 24 on the front upper plate body of the parallelogram frame 23 at the frontmost position can extend forward while flipping upward, and finally make the soft package surface on it inclined upward, ensuring the effective operation of the leg rest function.

[0044] However, compared with the rear rotating piece unit 1, the middle driving frame unit 2, and the front rotating piece 3, a part of the structure of the rear rotating piece unit 1 is located above its own hinge point. Therefore, after the air cylinder 25 is opened, the part of the rear rotating piece unit 1 located below its own hinge point rotates forward together with the middle driving frame unit 2 and the front rotating piece 3, which are consistent. However, the part of the rear rotating piece unit 1 located above its own hinge point rotates backward, which makes the backrest frame 22 fall down and effectively realizes the above-mentioned linkage function.

[0045] Finally, the following 4 points need to be specifically explained.

[0046] First, for the overall structure composed of, for example, 2 - 4 parallelogram frames 23, if one artificially holds the upper rear plate and the lower rear plate on the rearmost parallelogram frame 23 and applies force to make them close together, the forward rotation and extension movement of the leg rest plate 24 can be achieved. This is the reason why both the middle driving frame unit 2 and the front rotating piece 3 need to have fixed hinge points, and neither can be missing.

[0047] Second, the parallelogram style of the parallelogram frame 23 means that the shape formed by its 4 hinge points is a parallelogram, rather than the contour shape of the actual plate body forming the frame being a quadrilateral. Specifically, for each of the above-mentioned plate bodies, it can have a certain bending form on the premise of satisfying the above-mentioned hinge point position relationship.

[0048] Third, the upper rear plate and the lower rear plate of the previous parallelogram frame 23 can be the same plate as the lower front plate and the upper front plate of the next parallelogram frame 23 respectively. Correspondingly, there is no visible dividing line between the middle driving frame unit 2 and the front rotating piece 3 and the rearmost parallelogram frame 23, and they can also be integrally formed.

[0049] Fourth, if the number of the parallelogram frames 23 is too large, the leg rest plate 24 cannot provide relatively large support strength. If the number is too small, the forward extension distance and the upward rotation angle of the leg rest plate 24 may not be sufficient, making it difficult to provide a relatively comfortable leg rest function. Therefore, the number and size of the parallelogram frames 23 can and need to be set according to the actual use environment of the seat, and even the matching setting of the number and size.

[0050] The rear rotating piece unit 1 includes a parallelogram component piece 101 with two ends respectively hinged to the upper cross plate and the articulated linkage piece 4, and a backrest frame mounting piece 102 arranged on the parallelogram component piece 101.

[0051] In this embodiment, the general shape of the rear rotating piece unit 1 is "Y-shaped", that is, the general shape of the parallelogram forming piece 101 is "V-shaped", and the general shape of the backrest frame mounting piece 102 is "linear".

[0052] At the three end positions of the rear rotating piece unit 1 are respectively used for: hinging the upper cross plate 21-1, hinging the articulated linkage piece 4, and screwing the backrest frame 22. When the driving link 10 moves forward, the parallelogram forming piece 101 rotates generally forward, and the backrest frame mounting piece 102 rotates backward, thereby making the forward extension action of the leg rest plate 24 and the backward folding action of the backrest frame 22 linked.

[0053] The middle driving frame unit 2 includes an extension piece 201 with one end arranged on the parallelogram frame 23 at the rearmost side, and a driven piece 202 with both ends respectively hinged to the upper cross plate and the extension piece 201 and provided with the articulated linkage piece 4.

[0054] In this embodiment, the extension piece 201 is fixedly connected or integrally formed with the rear upper plate body of the parallelogram frame 23 at the rearmost side. The driven piece 202 is provided with three hinge points, and its specific shape is not fixed. For example, it can be: a straight plate, a circular arc plate, and a two-section folding plate.

[0055] The front rotating piece 3 and the extension piece 201 are respectively fixedly connected to two adjacent plate bodies on the parallelogram frame 23 at the rearmost side.

[0056] In this embodiment, the front rotating piece 3 is fixedly connected or integrally formed with the rear lower plate body of the parallelogram frame 23 at the rearmost side.

[0057] So far, for the above overall structure composed of, for example, 2-4 parallelogram frames 23, the rear upper plate body and the rear lower plate body of the parallelogram frame 23 at the rearmost side have been "held". These two plate bodies are the above-mentioned "two adjacent plate bodies".

[0058] When the included angle between these two plate bodies becomes smaller, the leg rest plate 24 can be extended and opened outward. For details, please refer to the appendix Figure 5 Conversely, when the included angle between these two plate bodies becomes larger, the leg rest plate 24 can be retracted and folded inward. For details, please refer to the appendix Figure 4

[0059] The middle driving frame unit 2 further includes a cylinder mounting hole 203 provided on the driven piece 202.

[0060] ​In this embodiment, the mounting end of the cylinder 25 is hinged to the dual-purpose link 9, and its telescopic end is hinged to the driving link 10. The two ends of the driving link 10 are respectively screwed to the cylinder mounting holes 203 on the two middle driving frame units 2 on the left and right, that is, the cylinder mounting hole 203 is the hinge mounting hole position for the cylinder 25.

[0061] Thus, one cylinder 25 can indirectly drive two leg support plates 24, ensuring that the entire leg support structure can obtain a stable opening and closing effect of synchronous movement and synchronous rotation at both ends in the horizontal direction.

[0062] Correspondingly, the complete leg support structure includes one leg support bottom plate 26, one footrest soft package 27, and two leg support plates 24. The length and width dimensions of the leg support bottom plate 26 are much larger than those of the leg support plate 24. The two ends of the former are respectively screwed to the two leg support plates 24. The leg support plate 24 is essentially the mounting plate of the entire leg support structure, and the leg support plate 24 is integrally formed with the front upper plate body of the frontmost parallelogram frame 23.

[0063] The seat frame structure further includes two downward protruding plate units 5 provided on the upper cross plate, which are used to increase the horizontal distance between the leg support plate 24 and the armrest plate frame 21, and the vertical distance between the leg support plate 24 and the upper cross plate. One of the downward protruding plate units 5 is used to hinge the rear rotating piece unit 1, and the other downward protruding plate unit 5 is used to hinge the middle driving frame unit 2 and the front rotating piece 3.

[0064] In this embodiment, the seat frame structure altogether includes four downward protruding plate units 5, and the length, width, and thickness dimensions of these four are all the same.

[0065] The functions of the downward protruding plate unit 5 include at least the following two.

[0066] First, make the relative position of the leg support plate 24 on the leg support bottom plate 26 as horizontally inward and vertically centered as possible, ensuring that the two leg support plates 24 can fully and stably support and mount the leg support bottom plate 26.

[0067] Second, the downward protruding plate unit 5 is welded to the upper horizontal plate 21-1. The thickness of the downward protruding plate unit 5 is the same as that of the rear rotating piece unit 1, the middle driving frame unit 2, the front rotating piece 3, and the plates forming the parallelogram frame 23, for example, 0.4 cm. However, as one of the main parts of the seat frame, the thickness of the armrest plate frame 21 is much greater than the above thickness, for example, 2 cm. Thus, the thickness dimensions of all the hinge points on the seat frame are unified, that is, there is no hinge position on the upper horizontal plate 21-1, and the same specification of bearings is used for all the hinge points, which will greatly improve the production efficiency of this seat.

[0068] The downward protruding plate unit 5 includes a vertical plate 501 fixedly arranged on the upper horizontal plate, and two mounting holes 502 arranged on the vertical plate 501.

[0069] In this embodiment, the shape of the vertical plate 501 is rectangular. Its upper half is generally used for welding the upper horizontal plate 21-1. The height of the mounting holes 502 is lower than that of the upper horizontal plate 21-1, and the two mounting holes 502 are arranged one in front and the other behind.

[0070] On one of the mounting holes 502 on the rear vertical plate 501, an elastic damping rope 6 connecting the articulated linkage piece 4 is provided.

[0071] In this embodiment, the two mounting holes 502 on the front vertical plate 501 are respectively used for hinging the front rotating piece 3 and the driven piece 202, so there is no space left.

[0072] One end of the elastic damping rope 6 hooks on an empty mounting hole 502 on the rear vertical plate 501, and the other end is connected to the articulated linkage piece 4, which can make the whole linkage operation have sufficient and appropriate damping. That is, during the whole process of the leg rest plate 24 extending outwards, the articulated linkage piece 4 is always away from the rear vertical plate 501, and the elastic damping rope 6 is gradually tensioned.

[0073] Among them, the elastic damping rope 6 can be an elastic rubber rope or a tension spring. Its damping effect is effective for the electrically adjustable mode, but its function and importance are particularly obvious for the manually adjustable mode, and it can allow the above support blocks not to be used.

[0074] When the elastic damping rope 6 is used in the above manually adjustable mode, when the user of the seat actively presses down the backrest plate, the above-mentioned linkage effect can be artificially triggered, so that the leg rest plate 24 also rotates outwards.

[0075] At this time, if the "sofa" state of the seat needs to be maintained, the user's back cannot leave the backrest plate.

[0076] The articulated linkage piece 4 is further provided with a compression deformation convex section 4-1 having a circular arc cross-sectional shape and used to increase its own structural strength.

[0077] In this embodiment, the direct effect of the compression deformation convex section 4-1 is to upgrade the articulated linkage piece 4 from its original "two-dimensional form" to a "three-dimensional form", and its ultimate effect is to enhance its own structural strength.

[0078] A threaded section is provided on the inner ring surface of the compression deformation convex section 4-1, and a threaded post 7 for connecting the elastic damping rope 6 and used to adjust the initial elastic strength of the elastic damping rope 6 is provided on the threaded section.

[0079] In this embodiment, the cross-sectional shape of the compression deformation convex section 4-1 is an open ring, so a threaded section can be provided thereon. The threaded post 7 is fixedly connected to the elastic damping rope 6 and is threadedly connected to the above-mentioned threaded section in an adjustable manner. Furthermore, the initial elasticity of the elastic damping rope 6 can be adjusted, and the overall damping strength can be adjusted, so that the force required to press down and lay down the backrest can be adjusted, which can greatly improve the comprehensiveness and comfort of the seat.

[0080] On the other hand, another upgraded usage method of the threaded post 7 is as follows: The number of them is 2. Plug rods and slots are respectively provided on the opposite end faces of the two. A socket ring 8 is sleeved on the plug rod. The elastic damping rope 6 is fixedly connected to the socket ring 8. The two threaded posts 7 clamp the socket ring 8 before and after adjustment, which makes the adjustment operation of the initial elastic strength of the elastic damping rope 6 not cause it to twist and extends its effective service life. For details, please refer to the appendix Figure 8 、 9 。

[0081] Finally, the "dual-purpose" of the dual-purpose connecting rod 9 means that its functions at least include the following two: connecting and fixing two armrest frame 21s on the left and right; hingedly installing the cylinder 25.

[0082] The lengths of the dual-purpose connecting rod 9 and the installation connecting rod 11 are equal and greater than the length of the driving connecting rod 10. For details, please refer to the appendix Figure 3 。

[0083] The embodiments of the present application have been described in detail above with reference to the drawings. However, the present application is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art in the technical field, various modifications can be made without departing from the purpose of the present application. These are all non-creative modifications and are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An electrically adjustable seat frame structure, comprising an armrest board frame (21), a backrest board frame (22), a parallelogram frame (23), and a leg rest board (24) provided on the parallelogram frame (23) at the forefront, characterized in that: It further includes a rear rotating piece unit (1) which is hingedly arranged on the upper cross plate of the armrest plate frame (21) and is provided with the backrest frame (22), a middle driving frame body unit (2) which is hingedly arranged on the upper cross plate and is fixedly connected to the middle part of the rearmost parallelogram frame body (23), a front rotating piece (3) which is hingedly arranged on the upper cross plate and is fixedly connected to the rearmost parallelogram frame body (23), and a hinged linkage piece (4) arranged on the rear rotating piece unit (1) and the middle driving frame body unit (2).

2. The electric adjustable seat frame structure according to claim 1, characterized in that: The rear rotating piece unit (1) includes a parallelogram component piece (101) with two ends respectively hinged to the upper cross plate and the hinged linkage piece (4), and a backrest frame mounting piece (102) arranged on the parallelogram component piece (101).

3. An electrically adjustable seat frame structure according to claim 1, characterized in that: The middle driving frame body unit (2) includes an extension piece (201) with one end arranged on the rearmost parallelogram frame body (23), and a driven piece (202) with two ends respectively hinged to the upper cross plate and the extension piece (201) and provided with the hinged linkage piece (4).

4. An electrically adjustable seat frame structure according to claim 3, characterized in that: The front rotating piece (3) and the extension piece (201) are respectively fixedly connected to two adjacent plate bodies on the rearmost parallelogram frame body (23).

5. The electric adjustable seat frame structure according to claim 3, characterized in that: The middle driving frame body unit (2) further includes a cylinder mounting hole (203) arranged on the driven piece (202).

6. The electric adjustable seat frame structure according to claim 1, characterized in that: It further includes two downward protruding plate units (5) arranged on the upper cross plate and used for increasing the lateral distance between the leg rest plate (24) and the armrest plate frame (21) and the vertical distance between the leg rest plate (24) and the upper cross plate. One of the downward protruding plate units (5) is used for hinging the rear rotating piece unit (1), and the other downward protruding plate unit (5) is used for hinging the middle driving frame body unit (2) and the front rotating piece (3).

7. The electric adjustable seat frame structure according to claim 6, characterized in that: The downward protruding plate unit (5) includes a vertical plate (501) fixedly arranged on the upper cross plate, and two mounting holes (502) arranged on the vertical plate (501).

8. The electric adjustable seat frame structure according to claim 7, characterized in that: On one of the mounting holes (502) on the rear vertical plate (501), there is an elastic damping rope (6) connecting the hinged linkage piece (4).

9. The electric adjustable seat frame structure according to claim 8, characterized in that: The hinged linkage piece (4) is further provided with a compression deformation protruding section (4-1) with a circular arc cross-section and used for increasing its own structural strength.

10. The electric adjustable seat frame structure according to claim 9, characterized in that: The inner ring surface of the compression deformation protruding section (4-1) is provided with a threaded section, and on the threaded section, there is a threaded post (7) connecting the elastic damping rope (6) and used for adjusting the initial elastic strength of the elastic damping rope (6).

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