Zero-gravity sofa iron frame with adjustable rear center of gravity stability

Abstract

The utility model relates to sofa iron stand technical field discloses a kind of zero-gravity sofa iron stands of adjusting rear gravity center stability, comprising: four-pronged chair seat, the lower end inner side surface of four-pronged chair seat is symmetrically welded with counterweight reinforcing rib, the upper end middle part of four-pronged chair seat is provided with seat frame pivot, the upper end outer wall of seat frame pivot is equipped with the H-shaped structure of front drive motor support, the outer wall of both sides of front drive motor support is equipped with single-sided riveting assembly by bolt mounting, the upper end of single-sided riveting assembly is connected with seat frame welding assembly by bolt.The linkage structure of the single-sided riveting assembly and seat frame welding assembly, backrest welding assembly of symmetrical arrangement is provided to the zero-gravity sofa iron stand of adjusting rear gravity center stability, drive in combination with front drive motor and backrest traction motor, realize the synchronous zero-gravity adjustment of backrest and leg, adopt multiple connecting rod cross arm structure and gravity optimization layout, so that sofa is always stable in base area in unfolded state gravity center, effectively prevent overturning.

Description

Technical Field

[0001] This utility model relates to the field of sofa frame technology, specifically a zero-gravity sofa frame with a stable center of gravity after adjustment. Background Technology

[0002] The sofa frame is the core support structure of a sofa, mainly made of high-strength cold-rolled steel or wrought iron. It features load-bearing capacity, deformation resistance, and corrosion resistance, and is primarily used in functional sofas and office sofas. A zero-gravity sofa frame, on the other hand, is a sofa support structure that achieves a weightless experience through mechanical design, primarily intended to provide a comfortable sitting or reclining experience.

[0003] A search revealed a zero-gravity, zero-wall-support sofa frame structure with publication number CN222149508U. This structure includes a fixed frame, a movable frame slidably disposed within the fixed frame, and a backrest assembly connected between the fixed frame and the movable frame. This structure addresses the issue of asynchronous movement between the front and back of conventional sofa frames during use. However, the support structure of this practical sofa frame is relatively simple, and the extension mechanism, after extension, is prone to shifting the center of gravity to one side due to its excessive protrusion. This can easily lead to instability and tipping of the sofa frame when sitting or lying down, and its stability after extension is poor. Therefore, we propose a zero-gravity sofa frame with a stable center of gravity after adjustment. Summary of the Invention

[0004] The purpose of this invention is to provide a zero-gravity sofa frame with a stable center of gravity after adjustment, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a zero-gravity sofa frame with a stable center of gravity after adjustment, comprising: The four-claw chair seat has symmetrically welded counterweight reinforcing ribs on its lower inner surface. A seat frame pivot is inserted through the upper center of the four-claw chair seat. An H-shaped front drive motor bracket is fitted onto the upper outer wall of the seat frame pivot. Single-sided riveting assemblies are bolted to the outer walls of both sides of the front drive motor bracket. A seat frame welding assembly is bolted to the upper end of the single-sided riveting assembly. A backrest welding assembly is riveted to the rear outer wall of the seat frame welding assembly. A backrest traction motor is riveted to the lower end of the backrest welding assembly, and the telescopic end of the backrest traction motor is connected to the inner side of the seat frame welding assembly. A front drive motor is riveted to the upper rear surface of the front drive motor bracket. A connecting square tube is riveted to the inner surface of the telescopic part of the single-sided riveting assembly, and the telescopic end of the front drive motor is riveted to the lower middle surface of the connecting square tube.

[0006] Furthermore, the front drive motor bracket is rotatably connected to the four-claw chair seat via a seat frame, and the single-sided riveting assembly is symmetrically arranged about the central axis of the front drive motor bracket.

[0007] Furthermore, a seat frame connecting plate with a central groove is provided at the connection between the single-sided riveting assembly and the seat frame welding assembly. An L-shaped connecting block is riveted to the lower surface of the seat frame connecting plate near the backrest welding assembly. A bracket connecting plate is riveted to the lower end of the L-shaped connecting block, and the lower outer wall of the bracket connecting plate is fixed to the upper surfaces of both sides of the front drive motor bracket by bolts. A first rotating arm is riveted to the upper surface of the bracket connecting plate near the L-shaped connecting block. A side connecting rod is riveted to the inner surface of the middle part of the first rotating arm, and the other end of the side connecting rod is riveted to the outer wall of the bracket connecting plate at the end away from the L-shaped connecting block. A lower connecting rod is riveted to the inner wall of the bracket connecting plate at the end near the side connecting rod. The lower inner side of the lower connecting rod... A bracket connecting rod is riveted to the surface, and the lower end of the bracket connecting rod is connected to the outer wall of the front drive motor bracket away from the backrest welding assembly by a rivet. A triangular plate is riveted to the inner surface of the upper end of the lower connecting rod by a first rotating arm, and the inner wall of the upper end of the triangular plate is connected to the outer surface of the middle part of the seat frame connecting plate by a rivet. An upper connecting rod is riveted to the inner surface of the middle part of the seat frame connecting plate, and the outer wall of the lower end of the upper connecting rod is connected to the inner side of the lower connecting rod and the triangular plate by a rivet. A first cross arm is also riveted to the connection between the triangular plate and the upper and lower connecting rods. A second cross arm is also riveted to the inner wall of the middle part of the seat frame connecting plate, and the end of the first cross arm away from the triangular plate is riveted to the inner surface of the middle part of the second cross arm.

[0008] Furthermore, a third cross arm is riveted to the inner wall of the end of the seat frame connecting plate away from the L-shaped connecting block, a fourth cross arm is riveted to the inner wall of the end of the second cross arm away from the seat frame connecting plate, and the middle parts of the third cross arm and the fourth cross arm are riveted together by rivets. A fifth cross arm is riveted to the other end of the fourth cross arm, a sixth cross arm is riveted to the other end of the third cross arm, and the middle parts of the fifth cross arm and the sixth cross arm are riveted together by rivets. A footrest plate is riveted to the other end of the sixth cross arm, an L-shaped seventh cross arm is connected to the other end of the fifth cross arm, a traction block is riveted to the bend of the seventh cross arm, and the other end of the traction block is riveted to the outer wall of the middle part of the footrest plate. A foot support plate is riveted to the inner wall of the end of the seventh cross arm away from the fifth cross arm, and the end of the foot support plate near the seventh cross arm is also riveted to the inner wall of the end of the footrest plate away from the sixth cross arm by rivets.

[0009] Furthermore, the L-shaped connecting block is rotatably connected to the seat frame connecting plate and the bracket connecting plate, the side connecting rod is rotatably connected to the bracket connecting plate and the first rotating arm, the lower connecting rod and the triangular plate are rotatably connected to the bracket connecting plate, the upper connecting rod and the triangular plate are rotatably connected to the seat frame connecting plate, the second cross arm is rotatably connected to the first cross arm and the seat frame connecting plate, the fourth cross arm is rotatably connected to the third cross arm and the fifth cross arm, the fifth cross arm is rotatably connected to the sixth cross arm and the seventh cross arm, the traction block is rotatably connected to the seventh cross arm and the foot corner plate, the sixth cross arm is rotatably connected to the foot corner plate, and the seventh cross arm is rotatably connected to the foot corner plate and the support plate.

[0010] Furthermore, a U-shaped seat frame U-tube is provided at the connection between the seat frame welding assembly and the single-sided riveting assembly. Seat frame connecting bases are symmetrically fixed to the outer walls of both sides of the seat frame U-tube by bolts. A backrest connecting tube with wings is welded at the connection between the seat frame U-tube and the backrest welding assembly. A seat frame motor base for connecting the backrest traction motor is welded to the inner wall of one side of the seat frame U-tube.

[0011] Furthermore, a backrest corner plate is provided at the connection between the backrest welding assembly and the backrest connecting pipe. A backrest frame is welded to the inner surface of the lower end of the backrest corner plate. A backrest motor seat is provided at the mounting point of the backrest frame and the backrest traction motor. The backrest traction motor is rotatably connected to the backrest welding assembly through the backrest motor seat and the seat frame motor seat. The backrest welding assembly is rotatably connected to the seat frame welding assembly through the telescopic end of the backrest traction motor.

[0012] Furthermore, a connecting square tube is riveted to the inner wall of the connection between the upper connecting rod and the triangular plate, and the connecting square tube is rotatably connected to the upper connecting rod through the telescopic end of the front drive motor. The upper connecting rod drives the single-sided riveting assembly through the telescopic end of the front drive motor to achieve the flip adjustment function.

[0013] Compared with the prior art, the beneficial effects of this utility model are: the zero-gravity sofa frame with stable center of gravity after adjustment is equipped with a linkage structure of symmetrically arranged single-sided riveting components, seat frame welding components, and backrest welding components. Combined with the front drive motor and backrest traction motor, synchronous zero-gravity adjustment of the backrest and legs is achieved. The multi-link cross arm structure and optimized center of gravity layout ensure that the center of gravity of the sofa is always stable in the base area when it is unfolded, effectively preventing tipping. Attached Figure Description

[0014] Figure 1 This is a side-view perspective diagram of the combined unfolded state of this utility model. Figure 2 This is a side-view perspective three-dimensional structural diagram of the single-sided riveting assembly of this utility model in its retracted state; Figure 3 This is a front-view three-dimensional structural diagram of the single-sided riveting assembly of this utility model in its retracted state; Figure 4 This is a side-view three-dimensional structural diagram of the single-sided riveting assembly of this utility model in its unfolded state.

[0015] In the diagram: 1. Four-claw seat; 2. Counterweight reinforcing rib; 3. Seat frame pivot; 4. Front drive motor bracket; 5. Single-sided riveting assembly; 501. Seat frame connecting plate; 502. L-shaped connecting block; 503. Bracket connecting plate; 504. First swing arm; 505. Side connecting rod; 506. Lower connecting rod; 507. Bracket connecting rod; 508. Triangular plate; 509. Upper connecting rod; 510. First cross arm; 511. Second cross arm; 512. Third cross arm; 513. Fourth cross arm; 514. Fifth cross arm; 515. Sixth cross arm; 516. Seventh cross arm; 517. Traction block; 518. Footrest plate; 519. Foot plate; 6. Seat frame welding assembly; 601. Seat frame U-shaped tube; 602. Seat frame connecting base; 603. Backrest connecting tube; 604. Seat frame motor mount; 7. Backrest welding assembly; 701. Backrest corner plate; 702. Backrest frame; 703. Backrest motor mount; 8. Backrest traction motor; 9. Front drive motor; 10. Connecting square tube. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides an improved zero-gravity sofa frame with a stable center of gravity after adjustment. Please refer to [link / reference]. Figures 1-2The sofa includes: a four-pronged seat 1, with symmetrically welded counterweight reinforcing ribs 2 on the inner surface of its lower end. The four-pronged seat 1 and the counterweight reinforcing ribs 2 are used to adjust the center of gravity of the sofa frame during functional adjustments, ensuring the stability of the support structure and preventing the sofa frame from easily tipping over. The four-pronged seat 1 and the counterweight reinforcing ribs 2 are plated with champagne gold paint. A seat frame pivot 3 is inserted through the upper center of the four-pronged seat 1, and an H-shaped front drive motor bracket 4 is fitted onto the upper outer wall of the seat frame pivot 3. The front drive motor bracket 4 has two sides... A single-sided riveting assembly 5 is bolted to the outer wall. The upper end of the single-sided riveting assembly 5 is bolted to a seat frame welding assembly 6. A U-shaped seat frame U-tube 601 is provided at the connection between the seat frame welding assembly 6 and the single-sided riveting assembly 5. A seat frame motor seat 604 for connecting the backrest traction motor 8 is welded to one inner wall of the seat frame U-tube 601. Seat frame connecting bases 602 are symmetrically fixed to both outer walls of the seat frame U-tube 601 with bolts. A backrest welding assembly 7 is riveted to the rear outer wall of the seat frame welding assembly 6. A winged backrest connecting tube 603 is welded to the connection between the seat frame U-shaped tube 601 and the backrest welding assembly 7. A backrest corner plate 701 is provided at the connection between the backrest welding assembly 7 and the backrest connecting tube 603. A backrest frame 702 is welded to the inner surface of the lower end of the backrest corner plate 701. A backrest motor mount 703 is provided at the mounting point of the backrest frame 702 and the backrest traction motor 8. The backrest traction motor 8 is riveted to the lower end of the backrest welding assembly 7, and the telescopic end of the backrest traction motor 8 is connected to the inner side of the seat frame welding assembly 6. Furthermore, the backrest traction motor 8 is rotatably connected to the backrest welding assembly 7 via the backrest motor base 703 and the seat frame motor base 604, and the backrest welding assembly 7 is rotatably connected to the seat frame welding assembly 6 via the telescopic end of the backrest traction motor 8. The backrest welding assembly 7 achieves rotational adjustment through the telescopic operation of the backrest traction motor 8 inside the seat frame welding assembly 6, realizing the zero-gravity function at the back of the sofa frame. When the backrest welding assembly 7 is flipped, the center of gravity moves towards the seat frame welding assembly 6, so that the center of gravity remains stable when the sofa frame is extended.

[0018] Please see Figures 1-2 and Figure 4A zero-gravity sofa frame with a stable center of gravity after adjustment includes: a seat frame connecting plate 501 with a central groove at the connection between the single-sided riveting assembly 5 and the seat frame welding assembly 6; an L-shaped connecting block 502 riveted to the lower surface of the seat frame connecting plate 501 near the backrest welding assembly 7; a bracket connecting plate 503 riveted to the lower end of the L-shaped connecting block 502; the lower outer wall of the bracket connecting plate 503 is fixed to the upper surfaces of both sides of the front drive motor bracket 4 by bolts; a first rotating arm 504 riveted to the upper surface of the bracket connecting plate 503 near the L-shaped connecting block 502; a side connecting rod 505 riveted to the inner surface of the middle part of the first rotating arm 504; and the other end of the side connecting rod 505 is riveted to the bracket connecting plate 503 away from the backrest welding assembly 7. One end of the outer wall of the L-shaped connecting block 502, a lower connecting rod 506 is riveted to the inner wall of the bracket connecting plate 503 near the side connecting rod 505, a bracket connecting rod 507 is riveted to the inner surface of the lower end of the lower connecting rod 506, and the lower end of the bracket connecting rod 507 is connected to the outer wall of the front drive motor bracket 4 away from the backrest welding assembly 7 by a rivet, a triangular plate 508 is riveted to the inner surface of the upper end of the lower connecting rod 506 by a first rotating arm 504, and the inner wall of the upper end of the triangular plate 508 is connected to the outer surface of the middle part of the seat frame connecting plate 501 by a rivet, an upper connecting rod 509 is riveted to the inner surface of the middle part of the seat frame connecting plate 501, and the outer wall of the lower end of the upper connecting rod 509 is connected to the inner surface of the lower connecting rod 506 and the triangular plate 508 by a rivet. On the side, a first cross arm 510 is riveted to the connection between the triangular plate 508 and the upper connecting rod 509 and the lower connecting rod 506. A second cross arm 511 is riveted to the inner wall of the middle part of the seat frame connecting plate 501, and the end of the first cross arm 510 away from the triangular plate 508 is riveted to the inner surface of the middle part of the second cross arm 511. A third cross arm 512 is riveted to the inner wall of the end of the seat frame connecting plate 501 away from the L-shaped connecting block 502. A fourth cross arm 513 is riveted to the inner wall of the end of the second cross arm 511 away from the seat frame connecting plate 501. The middle parts of the third cross arm 512 and the fourth cross arm 513 are riveted together by rivets. The other end of the fourth cross arm 513 is riveted to a fifth cross arm 514. The other end of arm 512 is riveted to a sixth cross arm 515, and the middle of the fifth cross arm 514 and the sixth cross arm 515 are riveted together by rivets. The other end of the sixth cross arm 515 is riveted to a foot plate 518. The other end of the fifth cross arm 514 is connected to an L-shaped seventh cross arm 516. A traction block 517 is riveted to the bend of the seventh cross arm 516, and the other end of the traction block 517 is riveted to the outer wall of the middle part of the foot plate 518. A foot support plate 519 is riveted to the inner wall of the end of the seventh cross arm 516 away from the fifth cross arm 514, and the end of the foot support plate 519 near the seventh cross arm 516 is also riveted to the inner wall of the end of the foot plate 518 away from the sixth cross arm 515 by rivets.The following connections are established: between the L-shaped connecting block 502 and the seat frame connecting plate 501 and the bracket connecting plate 503; between the side connecting rod 505 and the bracket connecting plate 503 and the first rotating arm 504; between the lower connecting rod 506 and the triangular plate 508 and the bracket connecting plate 503; between the upper connecting rod 509 and the triangular plate 508 and the seat frame connecting plate 501; between the second cross arm 511 and the first cross arm 510 and the seat frame connecting plate 501; between the fourth cross arm 513 and the third cross arm 512 and the fifth cross arm 514; between the fifth cross arm 514 and the sixth cross arm 515 and the seventh cross arm 516; and between the traction block 517 and the seventh cross arm 516. The sixth cross arm 515 and the footrest 518, the seventh cross arm 516 and the footrest 518, and the support plate 519 are all rotatably connected. The single-sided riveting assembly 5 achieves zero-gravity functionality by flipping the footrest 518 and the support plate 519, in conjunction with the flipping and tilting of the backrest welding assembly 7. After adjustment, the main counterweight components of the single-sided riveting assembly 5 and the backrest welding assembly 7 remain close to the front drive motor bracket 4 and the seat frame welding assembly 6, keeping the center of gravity stably at the lower end of the sofa frame. This ensures the adjusted sofa frame maintains good stability and prevents it from tipping over when sitting or lying down.

[0019] Please see Figure 1 and Figures 3-4 A zero-gravity sofa frame with a stable center of gravity after adjustment includes: a connecting square tube 10 riveted to the inner wall of the connection between the upper connecting rod 509 and the triangular plate 508, and the connecting square tube 10 is rotatably connected to the upper connecting rod 509 through the telescopic end of the front drive motor 9, and the upper connecting rod 509 drives the single-sided riveting assembly 5 to achieve a flip adjustment function through the telescopic end of the front drive motor 9; the front drive motor 9 is riveted to the upper surface of the rear end of the front drive motor bracket 4; the connecting square tube 10 is riveted to the inner surface of the telescopic part of the single-sided riveting assembly 5; and the telescopic end of the front drive motor 9 is riveted to the lower surface of the middle part of the connecting square tube 10. The connecting square tube 10 is used to rotate and drive the single-sided riveting assembly 5 to achieve flip extension and retraction when the telescopic end of the front drive motor 9 is extended or retracted, thereby realizing the zero-gravity mode of the sofa frame legs.

[0020] Working Principle: For this type of zero-gravity sofa frame with a stable center of gravity after adjustment, the four-claw seat 1 provides basic stability through the symmetrically welded counterweight reinforcing ribs 2 at its bottom. The front drive motor bracket 4 is rotatably connected to the four-claw seat 1 via the seat frame pivot 3. After the front drive motor 9 starts, its telescopic end pushes the connecting square tube 10, thereby driving the upper connecting rod 509 and the triangular plate 508 in the single-sided riveting assembly 5 to move. The single-sided riveting assembly 5 contains the seat frame connecting plate 501, L-shaped connecting block 502, bracket connecting plate 503, first rotating arm 504, side connecting rod 505, lower connecting rod 506, bracket connecting rod 507, first cross arm 510, second cross arm 511, third cross arm 512, fourth cross arm 513, fifth cross arm 514, sixth cross arm 515, seventh cross arm 516, traction block 517, foot corner plate 518, and support. The linkage of the footplate 519 ultimately achieves the smooth unfolding and lifting of the leg support section. At the same time, the seat frame welding assembly 6 is connected to the backrest welding assembly 7 through its seat frame U-shaped tube 601, seat frame connecting base 602, and backrest connecting tube 603. The backrest traction motor 8 is hinged to the seat frame welding assembly 6 and the backrest welding assembly 7 through the seat frame motor base 604 and the backrest motor base 703, respectively. When it extends or retracts, it drives the backrest welding assembly 7 (including the backrest corner plate 701 and the backrest frame 702) to flip backward relative to the seat frame welding assembly 6. During the entire adjustment process, the coordinated movement of each component allows the sofa to enter a zero-gravity posture. Furthermore, due to the counterweight design and linkage structure, the overall center of gravity after adjustment remains stable in the area between the four-claw seat 1 and the front drive motor bracket 4, improving and ensuring safety and comfort during use. The structure is stable, and the adjustment is smooth and reliable.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A zero-gravity sofa frame with a stable center of gravity after adjustment, characterized in that, include: A four-claw chair seat (1) has symmetrically welded counterweight reinforcing ribs (2) on the inner surface of its lower end. A seat frame pivot (3) is inserted through the middle of the upper end of the four-claw chair seat (1). An H-shaped front drive motor bracket (4) is fitted on the outer wall of the upper end of the seat frame pivot (3). Single-sided riveting assemblies (5) are bolted to the outer walls of both sides of the front drive motor bracket (4). A seat frame welding assembly (6) is bolted to the upper end of the single-sided riveting assembly (5). The rear outer wall of the seat frame is riveted with a backrest welding assembly (7), the lower end of the backrest welding assembly (7) is riveted with a backrest traction motor (8), and the telescopic end of the backrest traction motor (8) is connected to the inner side of the seat frame welding assembly (6). The rear upper surface of the front drive motor bracket (4) is riveted with a front drive motor (9), the inner surface of the telescopic part of the single-sided riveting assembly (5) is riveted with a connecting square tube (10), and the telescopic end of the front drive motor (9) is riveted to the lower surface of the middle part of the connecting square tube (10).

2. The zero-gravity sofa frame with a stable center of gravity after adjustment according to claim 1, characterized in that: The front drive motor bracket (4) is rotatably connected to the four-claw seat (1) through the seat frame, and the single-sided riveting assembly (5) is symmetrically arranged about the central axis of the front drive motor bracket (4).

3. A zero-gravity sofa frame with a stable center of gravity after adjustment, as described in claim 1, is characterized in that: A seat frame connecting plate (501) with a central groove is provided at the connection between the single-sided riveting assembly (5) and the seat frame welding assembly (6). An L-shaped connecting block (502) is riveted to the lower surface of the seat frame connecting plate (501) near the backrest welding assembly (7). A bracket connecting plate (503) is riveted to the lower end of the L-shaped connecting block (502). The lower outer wall of the bracket connecting plate (503) is fixed to the upper surfaces of both sides of the front drive motor bracket (4) by bolts. 3) A first rotating arm (504) is riveted to the upper surface of one end near the L-shaped connecting block (502). A side connecting rod (505) is riveted to the inner surface of the middle part of the first rotating arm (504), and the other end of the side connecting rod (505) is riveted to the outer wall of the bracket connecting plate (503) away from the L-shaped connecting block (502). A lower connecting rod (506) is riveted to the inner wall of the bracket connecting plate (503) near the side connecting rod (505). A bracket is riveted to the inner surface of the lower end of the lower connecting rod (506). The connecting rod (507) is connected to the outer wall of the front drive motor bracket (4) away from the backrest welding assembly (7) by a rivet at the lower end of the connecting rod (507). The inner surface of the upper end of the lower connecting rod (506) is riveted to a triangular plate (508) by a first rotating arm (504). The inner surface of the upper end of the triangular plate (508) is connected to the outer surface of the middle part of the seat frame connecting plate (501) by a rivet. The inner surface of the middle part of the seat frame connecting plate (501) is riveted to an upper connecting rod (509). Furthermore, the lower outer wall of the upper connecting rod (509) is connected to the inner side of the lower connecting rod (506) and the triangular plate (508) by rivets. A first cross arm (510) is also riveted to the connection between the triangular plate (508) and the upper connecting rod (509) and the lower connecting rod (506). A second cross arm (511) is also riveted to the inner wall of the middle part of the seat frame connecting plate (501). The end of the first cross arm (510) away from the triangular plate (508) is riveted to the inner surface of the middle part of the second cross arm (511).

4. A zero-gravity sofa frame with a stable center of gravity after adjustment, as described in claim 3, is characterized in that: A third cross arm (512) is riveted to the inner wall of the end of the seat frame connecting plate (501) away from the L-shaped connecting block (502). A fourth cross arm (513) is riveted to the inner wall of the end of the second cross arm (511) away from the seat frame connecting plate (501). The middle parts of the third cross arm (512) and the fourth cross arm (513) are riveted together by rivets. A fifth cross arm (514) is riveted to the other end of the fourth cross arm (513). A sixth cross arm (515) is riveted to the other end of the third cross arm (512). The middle parts of the fifth cross arm (514) and the sixth cross arm (515) are riveted together by rivets. The other end of the cross arm (515) is riveted to a foot corner plate (518). The other end of the fifth cross arm (514) is connected to an L-shaped seventh cross arm (516). A traction block (517) is riveted to the bend of the seventh cross arm (516), and the other end of the traction block (517) is riveted to the middle outer wall of the foot corner plate (518). A foot plate (519) is riveted to the inner wall of the end of the seventh cross arm (516) away from the fifth cross arm (514), and the end of the foot plate (519) near the seventh cross arm (516) is also riveted to the inner wall of the end of the foot corner plate (518) away from the sixth cross arm (515) by rivets.

5. A zero-gravity sofa frame with a stable center of gravity after adjustment, as described in claim 4, is characterized in that: Between the L-shaped connecting block (502) and the seat frame connecting plate (501) and the bracket connecting plate (503); between the side connecting rod (505) and the bracket connecting plate (503) and the first rotating arm (504); between the lower connecting rod (506) and the triangular plate (508) and the bracket connecting plate (503); between the upper connecting rod (509) and the triangular plate (508) and the seat frame connecting plate (501); and between the second cross arm (511) and the first cross arm (510) and the seat frame connecting plate (501). Between the fourth cross arm (513) and the third cross arm (512), the fifth cross arm (514), the fifth cross arm (514) and the sixth cross arm (515) and the seventh cross arm (516), the traction block (517) and the seventh cross arm (516) and the foot plate (518), the sixth cross arm (515) and the foot plate (518), and the seventh cross arm (516) and the foot plate (518) and the foot plate (519), all form a rotating connection.

6. A zero-gravity sofa frame with a stable center of gravity after adjustment, as described in claim 1, is characterized in that: A U-shaped seat frame U-tube (601) is provided at the connection between the seat frame welding assembly (6) and the single-sided riveting assembly (5). The outer walls of the seat frame U-tube (601) are symmetrically fixed with seat frame connecting bases (602) by bolts. A backrest connecting tube (603) with wings is welded at the connection between the seat frame U-tube (601) and the backrest welding assembly (7). A seat frame motor base (604) for connecting the backrest traction motor (8) is welded to one inner wall of the seat frame U-tube (601).

7. A zero-gravity sofa frame with a stable center of gravity after adjustment, as described in claim 6, is characterized in that: A backrest corner plate (701) is provided at the connection between the backrest welding assembly (7) and the backrest connecting pipe (603). A backrest frame (702) is welded to the inner surface of the lower end of the backrest corner plate (701). A backrest motor seat (703) is provided at the mounting point of the backrest frame (702) and the backrest traction motor (8). The backrest traction motor (8) is rotatably connected to the backrest welding assembly (7) through the backrest motor seat (703) and the seat frame motor seat (604). The backrest welding assembly (7) is rotatably connected to the seat frame welding assembly (6) through the telescopic end of the backrest traction motor (8).

8. A zero-gravity sofa frame with a stable center of gravity after adjustment, as described in claim 3, is characterized in that: The inner wall of the connection between the upper connecting rod (509) and the triangular plate (508) is also riveted with a connecting square tube (10), and the connecting square tube (10) is connected to the upper connecting rod (509) through the telescopic end of the front drive motor (9), and the upper connecting rod (509) drives the single-sided riveting assembly (5) to achieve the flip adjustment function through the telescopic end of the front drive motor (9).

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