Sofa frame

Abstract

The utility model relates to the technical field of seats, in particular to a sofa frame. The chair comprises a limiting seat, a first telescopic mechanism, a rotating seat, a base arranged on the limiting seat, a cushion plate arranged on the rotating seat, an extension plate hinged to the cushion plate, a backrest device arranged on the base, a first track, a second track, a first sliding block and a second sliding block, wherein the first track and the second track are arranged on the limiting seat, and the first sliding block and the second sliding block are connected with the rotating seat. The third rail is arranged on the limiting seat; the guide block is arranged on the rotating seat; a body of the first telescopic mechanism is rotationally arranged on the limiting base, and the rotating base is connected with the output end of the first telescopic mechanism. According to the utility model, the resistance of the rotating seat in the rotating process can be counteracted through the telescopic acting force of the first telescopic mechanism, so that the rotating seat is more labor-saving in the adjusting process, and the posture conversion is convenient; the extension plate is hinged to the cushion plate, so that the extension plate can adapt to the cushion plates in different postures, the practicability is high, and the utilization rate is high.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a sofa frame. Background Art

[0002] In recent years, comfortable and multifunctional sofas have become the first choice of most consumers. Therefore, functional sofas have become a popular sofa category in the current market. Currently, the functional sofas on the market are mainly manual functional sofas, and their main functions are: lifting and rotating the seat cushion, lying back, shaking and rotating, etc., and all the above postures need to be adjusted manually by manpower to change the posture of the sofa frame, realize the extension and contraction of the sofa frame, and realize the sofa in different forms. The patent application number CN201521016727.5 and the patent application name of a multifunctional sofa discloses a main body, a seat, a rotating assembly and a rotating part, wherein the main body is divided into a main body A and a main body B; the rotating part is installed on the main body A through the rotating assembly; the seat is installed on the main body B and two retractable support rods are arranged between the two, wherein the bottom of the support rod is connected to the main body B by a hinge connection; the main body A is installed with a tray, and the upper surface of the tray is flush with the main body tray mounting surface; the main body B is provided with a storage box; the bottom of the support rod is connected to the main body B by a hinge connection to realize that the support rod can rotate, which is convenient for lifting and lowering the seat body; the upper surface of the tray in the main body A is flush with the tray mounting surface in order to better place the rotating part and make the rotating part and the main body A more compact. The structure of the main body A1 in this patent application is single, and the shape of the main body A1 cannot be adjusted or converted according to the different postures of the sofa frame, and the practicality and comfort are poor. It is very difficult for the rotating part 4 to drive the main body A1 to rotate. Therefore, the defects are very obvious, and a solution is urgently needed. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a sofa frame.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A sofa frame comprises a limiting seat, a first telescopic mechanism, a rotating seat arranged above the limiting seat, a base arranged below the limiting seat, a cushion plate arranged above the rotating seat, an extension plate hinged to the cushion plate, a backrest device arranged on the base, a first track and a second track respectively arranged on the limiting seat, a first slider and a second slider respectively rotatably connected to the rotating seat, a third track arranged on the limiting seat and a guide block arranged on the rotating seat; the guide block is slidably connected to the third track; the first slider and the second slider are slidably connected to the first track and the second track respectively; the body of the first telescopic mechanism is rotatably arranged on a side surface of the limiting seat close to the base, the rotating seat is rotatably connected to the output end of the first telescopic mechanism; the angle between the first track and the second track is less than or equal to 90°.

[0006] Furthermore, a receiving groove is provided through the limit seat; an avoidance groove is provided on the base, the avoidance groove is communicated with the receiving groove, the first telescopic mechanism is accommodated in the avoidance groove, and the rotating seat passes through the receiving groove and is rotatably connected to the output end of the first telescopic mechanism.

[0007] Furthermore, the first track includes a track seat connected to the limit seat and a track body formed by protruding outward from the outer wall of the track seat; the first slider includes a slider body rotatably connected to the rotating seat and a slide groove body formed by recessed inward from the outer wall of the slider body, and the track body is concavely matched with the slide groove body and can be slidably connected with the inner wall of the slide groove body.

[0008] Furthermore, the first rail, the second rail, the first slider and the second slider are all made of aluminum alloy.

[0009] Furthermore, the third track includes a first guide rail and a second guide rail respectively arranged on the limit seat, and the guide block can be slidably connected to the first guide rail and the second guide rail respectively; the first guide rail and the second guide rail are both arranged in an arc shape.

[0010] Furthermore, the third track further includes a first abutment member and a second abutment member respectively arranged at ends of the first guide rail and the second guide rail that are away from each other.

[0011] Furthermore, the sofa frame also includes a connecting member arranged on the first rotating member of the rotating seat and a connecting shaft with one end hinged to the connecting member, and the other end of the connecting shaft passes through the accommodating groove and is rotatably connected to the output end of the first telescopic mechanism.

[0012] Furthermore, the backrest device includes a second telescopic mechanism, a support seat arranged on the base, a mounting seat hinged to the support seat, a backrest assembly hinged to the mounting seat, and a control switch arranged on the mounting seat; the body of the second telescopic mechanism is hinged to the support seat, and the output end of the second telescopic mechanism is hinged to the mounting seat; the control switch is used to turn on or off the telescopic movement of the second telescopic mechanism.

[0013] Furthermore, the mounting seat includes a seat body, a connecting rod connected to the seat body and a limit piece arranged on the seat body, and the backrest device also includes a guide groove arranged on the support seat; the mounting piece is connected to the seat body, and the connecting rod is respectively hinged to the backrest assembly and the output end of the second telescopic mechanism; the seat body is hinged to the support seat; the limit piece can rotate in the guide groove and can respectively interfere with the groove walls on both sides of the guide groove.

[0014] Furthermore, the backrest device also includes a backrest rod connected to the connecting rod.

[0015] Beneficial effects of the utility model: The utility model has high stability and stroke accuracy during use. The telescopic force of the first telescopic mechanism itself can offset the resistance encountered by the rotating seat during the rotation process, so that the rotating seat is more labor-saving during the adjustment process. The posture conversion of the utility model is convenient, and the extension plate is hinged with the seat cushion plate, so that the extension plate can adapt to the seat cushion plate in different postures, which is highly practical and has a high utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model in the first state.

[0017] Figure 2 It is a partial top view of the utility model in the first state.

[0018] Figure 3 It is a partial explosion diagram of the utility model in the first state.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the utility model in the second state.

[0020] Figure 5 It is a partial top view of the utility model in the third state.

[0021] Figure 6 It is a partial bottom view of the utility model.

[0022] Figure 7 It is an exploded view of the backrest device of the utility model.

[0023] Figure 8 It is a schematic diagram of a partial three-dimensional structure of the utility model.

[0024] Description of reference numerals:

[0025] 1. Limiting seat; 2. First telescopic mechanism; 3. Rotating seat; 4. First track; 5. Second track; 6. First slider; 7. Second slider; 8. Third track; 9. Guide block; 10. Accommodating groove; 11. Connecting piece; 12. Connecting shaft; 13. Base; 14. Cushion plate; 15. Extension plate; 16. Backrest device; 17. Support seat; 18. Second telescopic mechanism; 19. Mounting seat; 20. Mounting piece; 21. Mounting hole; 2 2. Backrest assembly; 23. Seat body; 24. Connecting rod; 25. Limiting member; 26. Guide groove; 27. Backrest rod; 31. First rotating member; 32. Second rotating member; 41. Track seat; 42. Track body; 61. Slider body; 62. Slide groove body; 81. First guide rail; 82. Second guide rail; 83. First abutment member; 84. Second abutment member; 91. Guide block body; 92. First guide member; 93. Second guide member. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0027] like Figures 1 to 8 As shown, the utility model provides a sofa frame, which includes a limiting seat 1, a first telescopic mechanism 2, a rotating seat 3 arranged above the limiting seat 1, a base 13 arranged below the limiting seat 1, a cushion plate 14 arranged above the rotating seat 3, an extension plate 15 hinged to the cushion plate 14, a backrest device 16 arranged on the base 13, a first track 4 and a second track 5 respectively arranged on the limiting seat 1, a first slider 6 and a second slider 7 respectively rotatably connected to the rotating seat 3, a third track 8 arranged on the limiting seat 1 and a guide block 9 arranged on the rotating seat 3; the guide block 9 is slidably connected to the third track 8; the first slider 6 and the second slider 7 are slidably connected to the first track 4 and the second track 5 respectively; the body of the first telescopic mechanism 2 is rotatably arranged on a side surface of the limiting seat 1 close to the base 13, and the rotating seat 3 is rotatably connected to the output end of the first telescopic mechanism 2; the angle between the first track 4 and the second track 5 is less than or equal to 90°.

[0028] Specifically, the angular range of the rotating seat 3 that can rotate relative to the limiting seat 1 is 0° to 90°; the third track 8 is used to guide the movement of the guide block 9 and the rotating seat 3 to prevent the first slider 6 and / or the second slider 7 from escaping from the first track 4 and / or the second track 5 during the rotation of the rotating seat 3; the two end points of the first track 4 are point A and point B, respectively, and the two end points of the second track 5 are point C and point D, respectively, the distance between point A and point C is smaller than the distance between point B and point D, and the distance from point C to point D is larger than the distance between the first slider 6 and the second slider 7; the first telescopic mechanism 2 can use a random stop gas spring. Preferably, the first telescopic mechanism 2 can use a balanced gas spring; the piston rod of the first telescopic mechanism 2 is rotatably connected to the rotating seat 3.

[0029] like Figures 1 to 3 As described, when the sofa frame is in the first state, the first slider 6 is located at one end of the first track 4 close to point B, the second slider 7 is located at one end of the second track 5 close to point C, and the total length of the first telescopic mechanism 2 is the longest. At this time, the length direction of the seat cushion 14 is perpendicular to the length direction of the backrest device 16, and the sofa frame can be used as a chaise longue or bed. When the extension plate 15 is parallel to the seat cushion 14, the extension plate 15 is an extension of the seat cushion 14, and both can be used for users to lie down; when the extension plate 15 is rotated relative to the seat cushion 14 to be inclined or vertical, the extension plate 15 can lift or support the legs of the user lying on the sofa frame, so that the user can lie down more comfortably. The rotating seat 3 is rotated and manually driven to rotate leftward. The second slider 7 is driven to slide on the second track 5 toward the direction close to point D and the first slider 6 is driven to slide on the first track 4 toward the direction close to point B. The rotating seat 3 rotates relative to the first slider 6 and the second slider 7 respectively. After the second slider 7 slides past the center point of point C and point D, the rotating seat 3 drives the first slider 6 to slide toward the direction close to point A. When the line connecting the first slider 6 and the second slider 7 is perpendicular to the symmetry axis of the first track 4 and the second track 5, as shown in FIG. Figure 4 As shown, at this time, the sofa frame is in the second state, the seat cushion plate 14 rotates about 45°, the total length of the first telescopic mechanism 2 is the shortest, and the rotating seat 3 continues to rotate to the left. The rotating seat 3 rotates and drives the first slider 6 to slide in the direction close to point A and drives the second slider 7 to slide in the direction close to point D. When the first slider 6 slides over the center point of point A and point B, the rotating seat 3 will drive the second slider 7 to slide in the direction close to point C, until the rotating seat 3 drives the seat cushion plate 14 to rotate until the length direction of the seat cushion plate 14 is parallel to the length direction of the backrest device. At this time, the sofa frame is in the third state, as shown in FIG. Figure 5As shown, the length of the first telescopic mechanism 2 is the longest. When the extension plate 15 is parallel to the cushion plate 14, the extension plate 15 is an extension of the cushion plate 14, and both can be used as a seat for the user; if the extension plate 15 is rotated to be inclined or perpendicular to the cushion plate 14, the extension plate 15 can be used as an armrest. Conversely, by rotating the rotating seat 3 to the right, the sofa frame can be restored from the third state to the first state. During the rotation of the rotating seat 3, the guide block 9 slides in the third track 8. The limiting cooperation between the guide block 9 and the third track 8 can avoid the problem of the first slider 6 or / and the second slider 7 escaping from the first track 4 or / and the second track 5 during the sofa state conversion process, thereby improving the stability of the utility model during use and the stroke accuracy during rotation. In addition, during the rotation process, the rotating seat 3 can also synchronously drive the piston rod of the first telescopic mechanism 2 to retract or extend the cylinder of the first telescopic mechanism 2, thereby shortening or extending the first telescopic mechanism 2, and the balance state of the oil-gas mixture at both ends of the piston in the cylinder of the first telescopic mechanism 2 is broken. Under the pressure of the oil-gas mixture in the cylinder of the first telescopic mechanism 2, the piston rod of the first telescopic mechanism 2 is pushed in the direction of retracting or extending into the cylinder. The telescopic force of the first telescopic mechanism 2 itself can offset the resistance encountered by the rotating seat 3 during the rotation process, thereby making the rotating seat 3 more labor-saving during the adjustment process. The posture conversion of the utility model is convenient, and the extension plate 15 is hinged with the seat cushion plate 14, so that the extension plate 15 can adapt to the seat cushion plate 14 in different postures, which is highly practical and has a high utilization rate.

[0030] Furthermore, a receiving groove 10 is penetrated on the limit seat 1; an avoidance groove (not shown in the figure) is provided on the base 13, the avoidance groove is communicated with the receiving groove 10, the first telescopic mechanism 2 is accommodated in the avoidance groove, and the rotating seat 3 penetrates the receiving groove 10 and is rotatably connected to the output end of the first telescopic mechanism 2, so as to avoid the first telescopic mechanism 2 from conflicting with the base 13 during the rotation or extension process.

[0031] In actual use, the accommodating groove 10 and the avoiding groove can respectively avoid the first telescopic mechanism 2 during the rotation process, thereby preventing the limiting seat 1 and the base 13 from interfering with the movement of the first telescopic mechanism 2 and the rotating seat 3.

[0032] Furthermore, the first track 4 includes a track seat 41 connected to the limit seat 1 and a track body 42 formed by the outer wall of the track seat 41 protruding outward; the first slider 6 includes a slider body 61 rotatably connected to the rotating seat 3 and a slide groove body 62 formed by the outer wall of the slider body 61 concave inward, and the track body 42 is concavely adapted to the slide groove body 62 and can be slidably connected with the inner wall of the slide groove body 62.

[0033] Specifically, the structures of the first rail 4 and the second rail 5 are the same or similar, and the structures of the first slider 6 and the second slider 7 are the same or similar, which will not be repeated here; the first rail 4, the second rail 5, the first slider 6 and the second slider 7 can all be made of aluminum alloy material. The front view of the cross section of the rail body 42 is arc-shaped. In actual use, the rail seat 41 and the limit seat 1 are easy to install, and the slider body 61 and the rotating seat 3 are easy to connect. The arc-shaped rail body 42 makes the slide groove body 62 and the rail body 42 encounter less resistance during the sliding process, thereby improving the smoothness of the rotating seat 3 during rotation. The first rail 4 and the first slider 6 made of aluminum alloy generate less resistance during the sliding process, slide more smoothly and generate less noise.

[0034] Furthermore, the third track 8 includes a first guide rail 81 and a second guide rail 82 respectively arranged on the limit seat 1, and the guide block 9 can be slidably connected to the first guide rail 81 and the second guide rail 82 respectively; the first guide rail 81 and the second guide rail 82 are both arranged to be arc-shaped.

[0035] Specifically, the first track 4 and the first guide rail 81 are symmetrically arranged with the second track 5 and the second guide rail 82 along the symmetry axis of the limit seat 1; the guide block 9 includes a guide block body 91 arranged on the rotating seat 3 and a first guide member 92 and a second guide member 93 respectively arranged at both ends of the guide block body 91, and the first guide member 92 and the second guide member 93 can be slidably connected with the first guide rail 81 and the second guide rail 82 respectively. The two end points of the first guide rail 81 are point E and point F respectively, and the two end points of the second guide rail 82 are point G and point H respectively. In actual use, in the first state, the second guide 93 is located at point G, the second guide 93 is slidably connected to the second guide rail 82, and the first guide 92 is out of the first guide rail 81. When the rotating seat 3 rotates from the first state to the second state, the second guide 93 slides to point H, and the first guide 92 protrudes to point F of the first guide rail 81. Through the restriction of the first guide rail 81 on the first guide 92 and the double restriction of the second guide rail 82 on the second guide 93, the first slider 6 is prevented from continuing to slide in the direction close to point B while the second slider 7 continues to slide in the direction close to point D, thereby solving the problem of the first slider 6 and the second slider 7 derailing from points B and D. In the process of changing from the first state to the second state, the second guide 93 is disengaged from the second guide rail 82, so that the second slider 7 can continue to slide in the direction close to point D, avoiding the problem of the rotating seat 3 being stuck. The third track 8 has a simple structure, is convenient for guiding the rotating seat 3, and has a good guiding effect.

[0036] Furthermore, the guide block body 91, the first guide member 92 and the second guide member 93 can all be made of plastic material, which further reduces the burden of the rotating seat 3 driving the guide block 9 during the rotation process and improves the rotation efficiency.

[0037] Furthermore, the third track 8 further includes a first resisting member 83 and a second resisting member 84 respectively disposed at ends of the first guide rail 81 and the second guide rail 82 that are away from each other.

[0038] In actual use, in the first state, the second guide member 93 can interfere with the second resisting member 84, thereby preventing the second slider 7 from falling out of the second track 5 from point C. In the third state, the first guide member 92 can interfere with the first resisting member 83, thereby preventing the first slider 6 from falling out of the first track 4 from point A. The addition of the first resisting member 83 and the second resisting member 84 further improves the stability of the utility model.

[0039] Furthermore, the rotating seat 3 includes a first rotating member 31 and a second rotating member 32, the two ends of the first rotating member 31 are respectively rotatably connected to the first slider 6 and the second slider 7, and the middle part of the second rotating member 32 is connected to the guide block 9; the first rotating member 31 and the second rotating member 32 are respectively connected to the seat cushion plate 14, and the middle part of the first rotating member 31 is connected to the output end of the first telescopic mechanism 2.

[0040] In actual use, the first rotating member 31 and the second rotating member 32 are vertically arranged to stably support the seat cushion 14 , and the first rotating member 31 and the second rotating member 32 are light in weight, which facilitates the rotation of the rotating seat 3 .

[0041] Furthermore, the sofa frame also includes a connecting member 11 arranged on the first rotating member 31 of the rotating seat 3 and a connecting shaft 12 with one end hinged to the connecting member 11. The other end of the connecting shaft 12 passes through the accommodating groove 10 and is rotatably connected to the output end of the first telescopic mechanism 2.

[0042] In actual use, the piston rod and the connecting member 11 of the first telescopic mechanism 2 are connected by the connecting shaft 12, the piston rod and the connecting member 11 of the first telescopic mechanism 2 are conveniently hinged, and the force adjustment of the first telescopic mechanism 2 during the rotation of the rotating seat 3 is convenient.

[0043] Furthermore, the backrest device 16 includes a second telescopic mechanism 18, a support seat 17 arranged on the base 13, a mounting seat 19 hinged to the support seat 17, a backrest assembly 22 hinged to the mounting seat 19, and a control switch (not shown in the figure) arranged on the mounting seat 19; the main body of the second telescopic mechanism 18 is hinged to the support seat 17, and the output end of the second telescopic mechanism 18 is hinged to the mounting seat 19; the control switch is used to turn on or off the telescopic movement of the second telescopic mechanism 18.

[0044] Specifically, the backrest device 16 further includes a mounting member 20 disposed on the mounting seat 19 and a mounting hole 21 disposed through the mounting member 20, and the control switch is mounted in the mounting hole 21. Figure 1 In the state shown, the total length of the second telescopic mechanism 18 is the longest, and the backrest assembly 22 is in an upright state at this time. When it is necessary to drive the backrest assembly 22 to tilt, the telescopic movement of the second telescopic mechanism 18 is turned on by the control switch, and then the mounting seat 19 is manually driven to rotate relative to the support seat 17, so that the mounting seat 19 and the backrest assembly 22 are synchronously tilted relative to the support seat 17, and the second telescopic mechanism 18 is rotated and compressed relative to the mounting seat 19 and the support seat 17 until the backrest assembly 22 tilts to a suitable angle, and the telescopic movement of the second telescopic mechanism 18 is turned off by the control switch, so that the second telescopic mechanism 18 is supported between the mounting seat 19 and the support seat 17 to maintain the tilt angle of the backrest assembly 22. When the second telescopic mechanism 18 is compressed to the shortest, the tilt angle of the mounting seat 19 is the largest, and the telescopic movement of the second telescopic mechanism 18 can be stopped at any time by the control switch, so that the stepless adjustment of the backrest assembly 22 is realized, and the stability of the utility model is improved. In addition, the backrest assembly 22 can rotate relative to the mounting seat 19, and the tilt angle of the backrest assembly 22 relative to the mounting seat 19 can be further adjusted. The two-stage adjustment increases the adjustable angle of the backrest assembly 22, and the tilt range of the adjusted backrest assembly 22 relative to the support seat 17 is larger, thereby meeting a variety of backrest requirements, and further improving the utilization rate and practicality of the utility model. The support seat 17 is added, and the cushion of the sofa is placed on the cushion plate 14. The height of the support seat 17 can be slightly higher than the height of the cushion of the sofa. The hinge between the support seat 17 and the mounting seat 19 is higher than or parallel to the cushion of the sofa. The mounting seat 19 will not interfere with the cushion of the sofa during the rotation process, which is conducive to the stable and rapid adjustment of the backrest assembly 22. A mounting hole 21 is dug on the mounting member 20 to facilitate the installation of the control switch. The mounting member 20 and the control switch rotate synchronously with the mounting seat 19, so that the control switch and the backrest assembly 22 are tilted synchronously, which is convenient for the user to operate the control switch.

[0045] Furthermore, the mounting seat 19 includes a seat body 23, a connecting rod 24 connected to the seat body 23 and a limit member 25 arranged on the seat body 23, and the backrest device 16 also includes a guide groove 26 arranged on the support seat 17; the mounting member 20 is connected to the seat body 23, and the connecting rod 24 is respectively hinged to the backrest assembly 22 and the output end of the second telescopic mechanism 18; the seat body 23 is hinged to the support seat 17; the limit member 25 can rotate in the guide groove 26 and can respectively contact the groove walls on both sides of the guide groove 26.

[0046] In actual use, the telescopic movement of the second telescopic mechanism 18 is turned on by controlling the switch, and the seat body 23 is manually driven to rotate relative to the support seat 17 to drive the second telescopic mechanism 18 to extend or shorten. The seat body 23 simultaneously drives the limiter 25 to rotate in the guide groove 26 until the limiter 25 contacts the groove wall on one side of the guide groove 26. The limiter 25 cooperates with the guide groove 26 to make the rotation stroke of the seat body 23 more accurate and more stable during rotation.

[0047] Specifically, the limiting member 25 and the mounting member 20 are respectively arranged vertically to the seat body 23, so that an installation gap can be reserved between the limiting member 25 and the seat body 23, which is convenient for the installation of the connecting rod 24. The connecting rod 24 is respectively welded to the limiting member 25 and / or the side of the seat body 23 away from the mounting member 20, thereby improving the firmness of the connection between the connecting rod 24 and the limiting member 25 and / or the seat body 23.

[0048] Furthermore, the backrest device 16 further includes a backrest rod 27 connected to the connecting rod 24 .

[0049] Specifically, the backrest rod 27 is arc-shaped, so that the backrest rod 27 fits the back contour of the human body better. In actual use, the backrest rod 27 is added to provide back support and improve the comfort when leaning back.

[0050] Specifically, the connecting rod 24 and the backrest assembly 22, the extension plate 15 and the seat cushion plate 14 can be connected by existing hinges, and the second telescopic mechanism 18 can adopt a gas spring, which can stop telescoping at any time at any telescopic position, which will not be repeated here.

[0051] All technical features in this embodiment can be freely combined according to actual needs.

[0052] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A sofa frame, characterized in that: The invention comprises a limit seat (1), a first telescopic mechanism (2), a rotating seat (3) arranged above the limit seat (1), a base (13) arranged below the limit seat (1), a cushion plate (14) arranged above the rotating seat (3), an extension plate (15) hinged to the cushion plate (14), a backrest device (16) arranged on the base (13), a first track (4) and a second track (5) respectively arranged on the limit seat (1), a first slider (6) and a second slider (7) respectively rotatably connected to the rotating seat (3), and a support structure (16) arranged on the limit seat (1). The invention relates to a third track (8) on the limiting seat (1) and a guide block (9) arranged on the rotating seat (3); the guide block (9) is slidably connected to the third track (8); the first slider (6) and the second slider (7) are slidably connected to the first track (4) and the second track (5) respectively; the body of the first telescopic mechanism (2) is rotatably arranged on a side surface of the limiting seat (1) close to the base (13), and the rotating seat (3) is rotatably connected to the output end of the first telescopic mechanism (2); the angle between the first track (4) and the second track (5) is less than or equal to 90°.

2. A sofa frame according to claim 1, characterized in that: The limiting seat (1) is provided with a receiving groove (10) extending therethrough; the base (13) is provided with an avoidance groove, the avoidance groove being in communication with the receiving groove (10), the first telescopic mechanism (2) being accommodated in the avoidance groove, and the rotating seat (3) extending therethrough is rotatably connected to the output end of the first telescopic mechanism (2) after passing through the receiving groove (10).

3. A sofa frame according to claim 1, characterized in that: The first track (4) comprises a track seat (41) connected to the limit seat (1) and a track body (42) formed by protruding outward from the outer wall of the track seat (41); the first slider (6) comprises a slider body (61) rotatably connected to the rotating seat (3) and a slide groove body (62) formed by recessing inward from the outer wall of the slider body (61); the track body (42) and the slide groove body (62) are concavely matched and can be slidably connected to the inner wall of the slide groove body (62).

4. The sofa frame according to claim 1, characterized in that: The first rail (4), the second rail (5), the first sliding block (6) and the second sliding block (7) are all made of aluminum alloy material.

5. The sofa frame according to claim 1, characterized in that: The third track (8) comprises a first guide rail (81) and a second guide rail (82) respectively arranged on the limit seat (1); the guide block (9) can be slidably connected to the first guide rail (81) and the second guide rail (82) respectively; the first guide rail (81) and the second guide rail (82) are both arranged in an arc shape.

6. A sofa frame according to claim 5, characterized in that: The third track (8) further comprises a first abutment member (83) and a second abutment member (84) which are respectively arranged at ends of the first guide rail (81) and the second guide rail (82) which are away from each other.

7. The sofa frame according to claim 1, characterized in that: The sofa frame further comprises a connecting member (11) arranged on a first rotating member (31) of the rotating seat (3) and a connecting shaft (12) one end of which is hingedly connected to the connecting member (11); the other end of the connecting shaft (12) passes through the accommodating groove (10) and is rotatably connected to the output end of the first telescopic mechanism (2).

8. A sofa frame according to any one of claims 1 to 7, characterized in that: The backrest device (16) comprises a second telescopic mechanism (18), a support seat (17) arranged on the base (13), a mounting seat (19) hinged to the support seat (17), a backrest component (22) hinged to the mounting seat (19), and a control switch arranged on the mounting seat (19); the body of the second telescopic mechanism (18) is hinged to the support seat (17), and the output end of the second telescopic mechanism (18) is hinged to the mounting seat (19); the control switch is used to turn on or off the telescopic movement of the second telescopic mechanism (18).

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