Three-posture frame structure and sofa structure

Abstract

The invention relates to the technical field of furniture, in particular to a three-posture frame structure and a sofa structure.The frame comprises a seat frame, a first telescopic unit, a second telescopic unit, a third telescopic unit and a fourth telescopic unit, the leg placing plate is fixed at the end part of the first telescopic unit; one end of the driving mechanism is rotationally connected to the bottom side of the seat frame, and the other end is rotationally connected with the first telescopic unit; the backrest frame is rotationally connected to the seat frame and located on the side away from the leg placing plate; the second telescopic unit is rotationally connected with the backrest frame and used for driving the angle of the backrest frame to change; wherein the second telescopic unit is rotationally connected with the first telescopic unit, the driving mechanism is in a sitting posture when retracting to an initial state, and when the driving mechanism extends, the first telescopic unit extends out of the seat frame to form a TV posture, and then the first telescopic unit drives the second telescopic unit to change the angle of the backrest frame to form a lying posture. Through the arrangement, the stability of the sofa is improved, and meanwhile, the comfort of three-posture adjustment is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture, and in particular to a three-posture frame structure and a sofa structure. Background Art

[0002] An electric sofa is a functional modern piece of furniture, which usually provides a variety of adjustable postures through the combination with a motor, such as a sitting posture suitable for reading or working, a TV posture suitable for watching TV or leisure and entertainment, and a lying posture suitable for relaxation or rest.

[0003] There are many three-posture sofa structures in the prior art, most of which achieve the adjustment of the angles between the leg board, seat board and backboard through the movement of an electric push rod. For example, the Chinese utility model patent with authorization announcement number CN215959113U disclosed a telescopic iron frame for an electric sofa on March 8, 2022. A telescopic mechanism is arranged on both sides of the telescopic iron frame, so that the driver can drive the second connecting rod assembly to drive the legrest mounting plate to unfold, and lift the front of the sofa seat mounting plate through the first connecting rod assembly, which can facilitate the adjustment of the sofa between sitting, TV and lying postures.

[0004] However, the inventors have found that the existing three-posture sofas, on the one hand, have a relatively complex structure, resulting in high production and maintenance costs; on the other hand, the seat cushions of the existing three-posture sofas mostly move together with the legrests, which not only affects the stability of the sofa structure, but also may cause the buttocks to tilt downward or slide when the footrest and the seat cushion are tilted at the same time, thereby affecting comfort. Summary of the invention

[0005] In view of at least one of the above technical problems, the present invention provides a three-posture frame structure and a sofa structure, which adopts structural improvements to improve the structural stability of the three-posture sofa and reduce the cost.

[0006] According to a first aspect of the present invention, there is provided a three-posture frame structure, a seat frame and: A first telescopic unit, connected to the bottom of the seat frame and capable of extending or retracting toward the front end of the seat frame; A leg rest fixed to the end of the first telescopic unit; A driving mechanism, one end of which is rotatably connected to the bottom side of the seat frame, and the other end of which is rotatably connected to the first telescopic unit; A backrest frame is rotatably connected to the seat frame and is located at a side away from the legrest; A second telescopic unit is rotatably connected to the backrest frame to drive the change of the angle of the backrest frame; Among them, the second telescopic unit is rotatably connected with the first telescopic unit, and when the driving mechanism is contracted to an initial state, it is a sitting position. When the driving mechanism is extended, the first telescopic unit is first extended out of the seat frame to form a TV position, and then the first telescopic unit drives the second telescopic unit to change the angle of the backrest frame to form a lying position.

[0007] In some embodiments of the present invention, the seat frame includes armrest frames arranged on both sides and a seat frame connected to the inner sides of the two armrest frames.

[0008] In some embodiments of the present invention, the armrest frame includes an armrest frame and two legs connected to the armrest frame, and the two legs are arranged in parallel and are integrally formed with the armrest frame.

[0009] In some embodiments of the present invention, the first telescopic unit includes: A first connecting rod, one end of which is rotatably connected to the legrest; A second connecting rod, one end of which is rotatably connected to the bottom of the seat frame, and the other end of which is pivotally connected to the other end of the first connecting rod to form a V-shaped telescopic structure; The third connecting rod has one end rotatably connected to the leg rest, and the middle part is rotatably connected to the middle part of the second connecting rod, so that the first connecting rod, the second connecting rod and the third connecting rod form a quadrilateral structure, and the other end of the third connecting rod is protruding outside the second connecting rod.

[0010] In some embodiments of the present invention, the first telescopic unit further comprises a T-shaped push rod, the T-shaped push rod comprises a cross rod and a vertical rod connected to the cross rod, one end of the cross rod is rotatably connected to the bottom of the seat frame, and the distal end of the vertical rod is rotatably connected to one end of the third connecting rod protruding from the second connecting rod; The driving mechanism is an electric push rod, and the driving end of the electric push rod is rotatably connected to the middle part of the vertical rod of the T-shaped push rod.

[0011] In some embodiments of the present invention, the first telescopic units are symmetrically arranged on both sides of the seat frame in the width direction, a support rod is connected between the two T-shaped push rods, the support rod is fixed on the two vertical rods, and the electric push rod is rotatably connected to the middle part of the support rod.

[0012] In some embodiments of the present invention, the second telescopic unit includes: A support plate, the support plate being fixed on the seat frame; A three-end connecting member, wherein a first end of the three-end connecting member is rotatably connected to the support plate, and a second end of the three-end connecting member is fixedly connected to a side wall of the backrest frame; A swing rod assembly has one end connected to the third end of the three-end connector and the other end rotatably connected to the other end of the crossbar of the T-shaped push rod, so that the angle of the backrest frame can be changed by rotating the T-shaped push rod.

[0013] In some embodiments of the present invention, the swing rod assembly includes a swing rod and a push-pull rod; One end of the swing rod is rotatably connected to the three-end connecting member, and the other end is rotatably connected to the push-pull rod, and the other end of the push-pull rod is rotatably connected to the cross bar; Among them, the support plate is provided with a guide rail, the swing rod and the push-pull rod are rotatably connected in the guide rail, the guide rail includes an arc segment and a straight segment, and the swing rod is configured to rotate only in the arc segment when the three-posture frame structure is driven to the TV posture.

[0014] In some embodiments of the present invention, the guide rail is a guide groove provided on the support plate, a roller is rotatably connected in the guide groove, and the swing rod and the push-pull rod are both rotatably connected to the roller.

[0015] According to a second aspect of the present invention, there is further provided a sofa structure, comprising the three-posture frame structure as described in any one of the first aspects.

[0016] The beneficial effects of the present invention are as follows: in the three-posture frame structure of the present invention, the seat frame is fixed, and the first telescopic unit and the second telescopic unit respectively drive the movement of each legrest and the backrest frame under the drive of the driving mechanism. Compared with the prior art, the structural stability of the three-posture sofa is improved, and through the linkage of the first telescopic unit and the second telescopic unit, the TV posture is adjusted first, and then the lying posture is adjusted. Compared with the prior art, the structure is simpler and can improve the user comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the TV posture in the three-posture frame structure in an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a sitting posture in a three-posture frame structure in an embodiment of the present invention; Figure 3 It is a structural schematic diagram of a lying posture in a three-posture frame structure in an embodiment of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of a three-posture frame structure in an embodiment of the present invention; Figure 5 Schematic diagram of the three-position frame structure in the embodiment of the present invention (handrail frame omitted); Figure 6 Schematic diagram of the three-position structure of the first telescopic unit in an embodiment of the present invention; Figure 7 A three-dimensional structural diagram of another perspective of the three-posture frame structure in an embodiment of the present invention (handrail frame omitted) Figure 8 In the embodiment of the present invention Figure 7 A local enlarged structural diagram of the part; Fig. 9 Schematic diagram of the connection structure of the support plate, the three-end connecting member and the swing rod in the embodiment of the present invention; Fig.10 Schematic diagram of the three-position structure of the second telescopic unit in an embodiment of the present invention.

[0019] Explanation of the accompanying drawings: 1. seat frame; 11. armrest frame; 11a. armrest frame; 11b. leg; 12. seat frame; 2. first telescopic unit; 21. first connecting rod; 22. second connecting rod; 23. third connecting rod; 24. T-type push rod; 24a. cross rod; 24b. vertical rod; 25. support rod; 3. legrest; 4. driving mechanism; 5. backrest frame; 6. second telescopic unit; 61. support plate; 611. guide rail; 611a. arc segment; 611b. straight segment; 612. connecting ear; 62. three-end connecting piece; 63. rocker assembly; 63a. swing rod; 63b. push-pull rod; 63c. roller. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] like Figures 1 to 10 The three-position frame structure shown in FIG. 1 includes a seat frame 1 and a first telescopic unit 2, a leg rest 3, a driving mechanism 4, a backrest frame 5 and a second telescopic unit 6 arranged on the seat frame 1. Figure 1 As shown in the figure, it is a TV posture in the three-posture frame in the embodiment of the present invention. In the embodiment of the present invention, the first telescopic unit 2 is connected to the bottom of the seat frame 1 and can be extended or retracted toward the front end of the seat frame 1; the front end of the seat frame 1 here refers to the direction in which the user's calves are raised after sitting on the sofa; the legrest board 3 is fixed to the end of the first telescopic unit 2, and the end here refers to Figure 1 One end of the driving mechanism 4 is rotatably connected to the bottom side of the seat frame 1, and the other end is rotatably connected to the first telescopic unit 2; Figure 2 As shown in, it is a sitting posture in the three-posture frame in the embodiment of the present invention. In the embodiment of the present invention, the driving mechanism 4 performs telescopic movement in a linear direction, and specifically can be various structural forms such as an electric push rod and a gas spring. The backrest frame 5 is rotatably connected to the seat frame 1, and is located on the side away from the legrest 3; the rotational connection here refers to the rotational connection between the bottom of the backrest frame 5 and the rear of the seat frame 1 to enable the user to switch between a sitting posture and a lying posture; the second telescopic unit 6 is rotatably connected to the backrest frame 5 to drive the change of the angle of the backrest frame 5; it should be pointed out here that the first telescopic unit 2 and the second telescopic unit 6 have various structural forms in the prior art, which can be realized by connecting multiple connecting rods. In the following embodiments of the present invention, one of the specific structures will be described in detail; In the embodiment of the present invention, the second telescopic unit 6 is rotatably connected to the first telescopic unit 2. When the driving mechanism 4 is retracted to the initial state, the user is in a sitting position. When the driving mechanism 4 is extended, the first telescopic unit 2 is first extended out of the seat frame 1 to form a TV position, and then the first telescopic unit 2 drives the second telescopic unit 6 to change the angle of the backrest frame 5 to form a lying position. That is, in the embodiment of the present invention, when the driving mechanism 4 is extended, the angle of the legrest 3 in the TV position is first adjusted. When the user lies on the backrest, the calf can be adjusted to a comfortable angle, and the angle of the buttocks and back does not need to be changed during the adjustment process; when the user needs to lie down, the driving mechanism 4 is continued to be controlled to extend to realize the reclining of the backrest frame 5, thereby adjusting the angle of the backrest. Through the above arrangement, the adjustment posture is more varied and more adaptable to users of different body shapes.

[0024] In the above embodiment, the seat frame 1 in the three-posture frame structure is fixed, and the first telescopic unit 2 and the second telescopic unit 6 respectively drive the movement of each legrest 3 and the backrest frame 5 under the drive mechanism 4. Compared with the prior art, the structural stability of the three-posture sofa is improved, and through the linkage of the first telescopic unit 2 and the second telescopic unit 6, the TV posture is adjusted first, and then the lying posture is adjusted. Compared with the prior art, the structure is simpler and can improve the user comfort.

[0025] Based on the above embodiments, Figure 4 As shown in , in some embodiments of the present invention, the seat frame 1 includes armrest frames 11 arranged on both sides and a seat frame 12 connected to the inner sides of the two armrest frames 11. When the connection is performed, the seat frame 12 is connected to the two armrest frames 11 on both sides respectively, and the specific connection method can be achieved by screw connection or the like. The setting of this structure is convenient for processing and installation, and is also convenient for disassembly and maintenance.

[0026] In order to further improve the convenience of processing and production, please continue to refer to Figure 4 In the embodiment of the present invention, the armrest frame 11 includes an armrest frame 11a and two legs 11b connected to the armrest frame 11a. The two legs 11b are arranged in parallel and are integrally formed with the armrest frame 11a. By arranging the legs 11b on the armrest frame 11, after the armrest frame 11 is connected to the seat frame 12, the seat frame 1 is already formed, thereby improving the efficiency of installation. In the embodiment of the present invention, it can be as follows Figure 4 As shown in the figure, the armrest frame 11 is set as a door-type frame and a connecting rod is connected in the middle. When connecting with the seat frame 12, it is connected at the connecting rod. Through the setting of this structural form, the structure is simple and the structural stability of the armrest frame 11 can be ensured.

[0027] In some embodiments of the present invention, please refer to Figure 5 and Figure 6 The first telescopic unit 2 includes: a first connecting rod 21, a second connecting rod 22 and a third connecting rod, wherein Figure 5As shown in , one end of the first connecting rod 21 is rotatably connected to the legrest 3; when making the specific connection, it can be directly connected to the legrest 3 or a profile such as angle steel can be set on the legrest 3 for connection; one end of the second connecting rod 22 is rotatably connected to the bottom of the seat frame 1, and the other end is pivotally connected to the other end of the first connecting rod 21 to form a V-shaped telescopic structure; when the V-shaped telescopic structure is extended or retracted, the angles of the first connecting rod 21 and the second connecting rod 22 change, thereby achieving a change in the angle and position of the legrest 3; one end of the third connecting rod 23 is rotatably connected to the legrest 3, and the middle part is rotatably connected to the middle part of the second connecting rod 22, so that the first connecting rod 21, the second connecting rod 22 and the third connecting rod 23 form a quadrilateral structure, and the other end of the third connecting rod 23 is protruded from the outside of the second connecting rod 22. By such a configuration, when the part of the third connecting rod 23 protruding from the outside of the second connecting rod 22 is pushed, the angle of the quadrilateral changes, so that the legrest 3 changes from a vertical state to a vertical state as shown in the figure. Figure 6 When the legrest board 3 is pushed further, the legrest board 3 is located at the upper part of the seat frame 12, so that the lying position structure of the legs can be formed.

[0028] Alternatively, if Figure 5 and Figure 6 As shown in , the first telescopic unit 2 also includes a T-shaped push rod 24, which includes a crossbar 24a and a vertical rod 24b connected to the crossbar 24a, one end of the crossbar 24a is rotatably connected to the bottom of the seat frame 1, and the distal end of the vertical rod 24b is rotatably connected to one end of the third connecting rod 23 protruding from the second connecting rod 22; in the embodiment of the present invention, the length of the vertical rod 24b of the T-shaped push rod 24 is greater than the length of the crossbar 24a, and the rotation connection point of the crossbar 24a and the seat frame 1 is close to the rotation connection point of the third connecting rod 23. Through this structural form, not only does the T-shaped push rod 24 constitute a lever structure, but also the T-shaped push rod 24 pushes the legrest 3 from a vertical state upward in a tilted manner during the rotation process, which is conducive to the smooth transmission of force and reduces the concentration of stress. In the embodiment of the present invention, the driving mechanism 4 is an electric push rod, and the driving end of the electric push rod is rotatably connected to the middle part of the vertical rod 24b of the T-shaped push rod 24. The electric push rod is a prior art and will not be described here.

[0029] Optionally, in order to further improve the stability of the force applied by the driving mechanism 4, in an embodiment of the present invention, Figure 5 As shown in the figure, the first telescopic unit 2 is symmetrically arranged on both sides of the seat frame 1 in the width direction, a support rod 25 is connected between the two T-shaped push rods 24, the support rod 25 is fixed on the two vertical rods 24b, and the electric push rod is rotatably connected to the middle of the support rod 25. In this way, when the electric push rod applies force, the force is first transmitted to the support rod 25, and then the support rod 25 synchronously promotes the rotation of the two T-shaped push rods 24, so that the legrest 3 can be turned in a parallel state without twisting.

[0030] In some embodiments of the present invention, the specific structure of the second telescopic unit 6 is as follows: Figure 7 and Figure 8 As shown in FIG. 1 , the second telescopic unit 6 includes a support plate 61, a three-end connecting member 62 and a swing rod assembly 63. Figure 8 As shown in the figure, the support plate 61 is fixed on the seat frame 1; when making the specific connection, a hole can be opened on the support plate 61, and it can be fixed to the seat frame 12 by screwing. In the embodiment of the present invention, the support plate 61 is vertically arranged; the first end of the three-end connecting member 62 is rotatably connected to the support plate 61, and the second end of the three-end connecting member 62 is fixedly connected to the side wall of the backrest frame 5; in the embodiment of the present invention, the three-end connecting member 62 is an inverted T-shaped structure, and the middle vertical section is fixedly connected to the backrest frame 5. The angle of the backrest frame 5 is adjustable through the rotation connection of the first end with the support plate 61, and the angle change is driven by the rocker assembly 63; one end of the rocker assembly 63 is connected to the third end of the three-end connecting member 62, and the other end is rotatably connected to the other end of the cross bar 24a of the T-type push rod 24, so as to realize the change of the angle of the backrest frame 5 through the rotation of the T-type push rod 24.

[0031] Please continue to refer to Figure 8 and Fig. 9 In the embodiment of the present invention, the swing rod assembly 63 includes a swing rod 63a and a push-pull rod 63b; one end of the swing rod 63a is rotatably connected to the three-end connector 62, and the other end is rotatably connected to the push-pull rod 63b, and the other end of the push-pull rod 63b is rotatably connected to the crossbar 24a; wherein the support plate 61 has a guide rail 611, the swing rod 63a and the push-pull rod 63b are rotatably connected in the guide rail 611, the guide rail 611 includes an arc segment 611a and a straight segment 611b, and the swing rod 63a is configured to rotate only in the arc segment 611a when the three-posture frame structure is driven to the TV posture. Fig. 9 As shown in the figure, by setting the arc segment 611a and the straight segment 611b of the guide rail 611, the swing rod 63a can swing and rotate in the arc segment 611a with the connection point of the three-end connecting piece 62 as the center, so that the backrest frame 5 is not affected during the TV posture adjustment process; when the TV posture adjustment is completed and the lying posture adjustment continues, the push-pull rod 63b pulls the swing rod 63a into the straight segment 611b, and the straight segment 611b is tilted upward, so that the swing rod 63a can pull the three-end connecting piece 62 to change the angle, thereby driving the backrest frame 5 to change the angle.

[0032] In some embodiments of the present invention, Fig. 9As shown in the figure, the guide rail 611 is a guide groove arranged on the support plate 61, and a roller 63c is rotatably connected in the guide groove, and the swing rod 63a and the push-pull rod 63b are both rotatably connected to the roller 63c. By setting the roller 63c, the resistance of the swing rod 63a when moving in the guide rail 611 can be reduced, and the processing and manufacturing are convenient, and the production cost is reduced. In addition, in the embodiment of the present invention, as shown in FIG. Fig. 9 As shown, the support plate 61 also has a connecting ear 612 bent inwardly. Figure 4 As shown in , the connecting ear 612 can fix the seat frame 12 on the one hand, and on the other hand, the connecting ear 612 also has a limiting function, which can abut against the side wall of the three-end connecting piece 62 to prevent the backrest frame 5 from tilting forward excessively.

[0033] In an embodiment of the present invention, a sofa structure is also provided, including the above-mentioned three-posture frame structure. When processing, it is only necessary to fix the seat cushion, backrest, armrests and electric control switches on the frame. The structure is simple and easy to install, and suitable for promotion and use. Technicians in this industry should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A three-posture frame structure, characterized in that: It includes a seat frame and the following items arranged on the seat frame: A first telescopic unit, connected to the bottom of the seat frame and capable of extending or retracting toward the front end of the seat frame; A leg rest fixed to the end of the first telescopic unit; A driving mechanism, one end of which is rotatably connected to the bottom side of the seat frame, and the other end of which is rotatably connected to the first telescopic unit; A backrest frame is rotatably connected to the seat frame and is located at a side away from the legrest; A second telescopic unit is rotatably connected to the backrest frame to drive the change of the angle of the backrest frame; Among them, the second telescopic unit is rotatably connected with the first telescopic unit, and when the driving mechanism is contracted to an initial state, it is a sitting position. When the driving mechanism is extended, the first telescopic unit is first extended out of the seat frame to form a TV position, and then the first telescopic unit drives the second telescopic unit to change the angle of the backrest frame to form a lying position.

2. The three-posture frame structure according to claim 1, characterized in that: The seat frame comprises armrest frames arranged on both sides and a seat frame connected to the inner sides of the two armrest frames.

3. The three-posture frame structure according to claim 2, characterized in that: The armrest frame comprises an armrest frame and two legs connected to the armrest frame, wherein the two legs are arranged in parallel and are integrally formed with the armrest frame.

4. The three-posture frame structure according to claim 1, characterized in that: The first telescopic unit comprises: A first connecting rod, one end of which is rotatably connected to the legrest; A second connecting rod, one end of which is rotatably connected to the bottom of the seat frame, and the other end of which is pivotally connected to the other end of the first connecting rod to form a V-shaped telescopic structure; The third connecting rod has one end rotatably connected to the leg rest, and the middle part is rotatably connected to the middle part of the second connecting rod, so that the first connecting rod, the second connecting rod and the third connecting rod form a quadrilateral structure, and the other end of the third connecting rod is protruding outside the second connecting rod.

5. The three-posture frame structure according to claim 4, characterized in that: The first telescopic unit further comprises a T-shaped push rod, the T-shaped push rod comprises a cross rod and a vertical rod connected to the cross rod, one end of the cross rod is rotatably connected to the bottom of the seat frame, and the distal end of the vertical rod is rotatably connected to one end of the third connecting rod protruding from the second connecting rod; The driving mechanism is an electric push rod, and the driving end of the electric push rod is rotatably connected to the middle part of the vertical rod of the T-shaped push rod.

6. The three-posture frame structure according to claim 5, characterized in that: The first telescopic units are symmetrically arranged on both sides of the seat frame in the width direction, a support rod is connected between the two T-shaped push rods, the support rod is fixed on the two vertical rods, and the electric push rod is rotatably connected to the middle part of the support rod.

7. The three-posture frame structure according to claim 5, characterized in that: The second telescopic unit comprises: A support plate, the support plate being fixed on the seat frame; A three-end connecting member, wherein a first end of the three-end connecting member is rotatably connected to the support plate, and a second end of the three-end connecting member is fixedly connected to a side wall of the backrest frame; A swing rod assembly has one end connected to the third end of the three-end connector and the other end rotatably connected to the other end of the crossbar of the T-shaped push rod, so that the angle of the backrest frame can be changed by rotating the T-shaped push rod.

8. The three-posture frame structure according to claim 7, characterized in that: The swing rod assembly includes a swing rod and a push-pull rod; One end of the swing rod is rotatably connected to the three-end connecting member, and the other end is rotatably connected to the push-pull rod, and the other end of the push-pull rod is rotatably connected to the cross bar; Among them, the support plate is provided with a guide rail, the swing rod and the push-pull rod are rotatably connected in the guide rail, the guide rail includes an arc segment and a straight segment, and the swing rod is configured to rotate only in the arc segment when the three-posture frame structure is driven to the TV posture.

9. The three-posture frame structure according to claim 8, characterized in that: The guide rail is a guide groove arranged on the support plate, a roller is rotatably connected in the guide groove, and the swing rod and the push-pull rod are both rotatably connected to the roller.

10. A sofa structure, characterized in that: It comprises a three-posture frame structure as claimed in any one of claims 1 to 9.

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