Sofa frame capable of adjusting angle of backrest and sofa thereof

Abstract

The utility model relates to a sofa frame capable of adjusting the angle of a backrest and a sofa thereof. The sofa frame comprises a seat frame, a backrest frame, rotating pieces arranged on the two sides of the seat frame, a sliding guide assembly and a locking assembly, wherein the sliding guide assembly and the locking assembly are arranged below the seat frame; the upper part and the lower part of the other end of the rotating sheet are respectively hinged with the armrest side plates and the seat frame; the sliding guide assembly comprises a fixing assembly, a sliding block and a connecting assembly. The two sides of the seat frame are hinged to the upper portions of the two sides of the connecting assembly. The backrest frame and the rotating piece can rotate around the second hinged end of the armrest side plate under the action of external force so as to adjust the toppling angle of the backrest frame, drive the seat frame to rotate around the first hinged end of the rotating piece, drive the seat frame to rotate around the third hinged end of the connecting assembly and drive the sliding block to slide on the fixing assembly. And the locking assembly can act on the connecting assembly to keep the seat frame and the backrest frame in a locking state. The sofa frame drives the backrest to fall down by virtue of the backward leaning force of a human body, and is simple in structure and convenient to lie down.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to a sofa frame and sofa with adjustable backrest angle. Background Technology

[0002] With rapid societal development and rising living standards, many different types of furniture have emerged on the market. Furniture can include comfortable and flexible functional home furnishings such as retractable beds, sofas, or chairs. Existing sofas typically have adjustable backrests, allowing them to adapt to different sitting and reclining postures for greater user comfort.

[0003] Chinese utility model patent application CN207693289U discloses a sofa frame backrest angle adjustment mechanism, including a base; side plates on both sides of the base; backrest assemblies connected to both side plates; a telescopic motor and a connecting pipe connected to the telescopic motor; the two ends of the connecting pipe are respectively connected to the backrest assemblies on both sides of the base; the backrest assembly includes a swing rod connected to the connecting pipe, a first back rod hinged to the swing rod, a second back rod hinged to the swing rod, and a backrest support plate hinged to the first back rod; the backrest support plate is hinged to the side plates; the second back rod is hinged to the side plates; and a telescopic rod connected to the telescopic motor and a fixed pipe connected to the telescopic rod; the two ends of the fixed pipe are respectively connected to the side plates on both sides of the base. This utility model controls the backrest angle by using a telescopic motor, which is more convenient for users than manual adjustment.

[0004] The above solution controls the backrest angle with a motor and uses many rods for transmission, resulting in a complex structure and high manufacturing cost. Summary of the Invention

[0005] To address the aforementioned issues, the present invention aims to provide a sofa frame with an adjustable backrest angle. This sofa frame uses the force of the human body leaning backward to drive the backrest down. It has a simple structure, is easy to recline, and is equipped with a gas spring for cushioning and locking, thereby making the sofa frame more stable when adjusting the backrest angle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An adjustable backrest angle sofa frame includes a seat frame and a backrest frame, characterized in that: it further includes rotating pieces disposed on both sides of the seat frame, a sliding guide assembly disposed below the seat frame, and a locking assembly; one end of the rotating piece is fixedly connected to the backrest frame, and the upper and lower parts of the other end are respectively hinged to the armrest side panels and the seat frame; the sliding guide assembly includes a fixing assembly fixed to the armrest side panels on both sides, a slider slidably disposed on the fixing assembly, and a connecting assembly connecting the sliders on both sides, and the two sides of the seat frame are hinged to the upper parts of the two sides of the connecting assembly;

[0008] The backrest frame and rotating plate can rotate around the second hinge end with the armrest side plate under the action of external force to adjust the tilt angle of the backrest frame, drive the seat frame to rotate around the first hinge end with the rotating plate, drive the seat frame to rotate around the third hinge end with the connecting component, and drive the slider to slide on the fixed component.

[0009] The locking component acts on the connecting component to lock the slider onto the fixing component, keeping the seat frame and backrest frame in a locked state.

[0010] Preferably, a fan-shaped plate is fixedly provided on the inner wall of the handrail side plate, and a fan-shaped groove is formed on the fan-shaped plate. A connecting post is provided on the upper part of the bottom surface of the fan-shaped groove. The rotating plate is U-shaped, and a connecting hole is provided on the upper part of the near end of the rotating plate to engage with the connecting post so that part of the rotating plate can rotate in the fan-shaped groove.

[0011] Preferably, a fan-shaped cover is fitted on the outer side of the fan-shaped plate, and a first fixing hole is provided on the handrail side plate, the fan-shaped plate, the connecting column and the fan-shaped cover respectively.

[0012] Preferably, the distal end of the rotating piece is bent so that the upper part of the distal end of the rotating piece is offset toward the seat frame side, and the outer wall of the rotating piece is recessed on the inner wall to form a convex wall, the convex wall extends to both sides in a U-shape, and the edge of the convex wall forms a reinforcing rib.

[0013] Preferably, the fixing component has a sliding cavity, and the slider includes a mounting block adapted to slide and locked in the sliding cavity, and a connecting block extending out of the sliding cavity and fixed to the connecting component; the connecting component includes a connecting tube fixedly connected to the sliders on both sides, and a connecting plate disposed at both ends of the connecting tube and extending upward, and the two sides of the seat frame are hinged to the upper part of the connecting plate; the fixing component is inclined downward from the outside to the inside, and includes a fixing seat and a pad installed between the fixing seat and the side plate, the fixing seat has a through sliding hole, and the pad fits against the inner wall of the fixing seat so that the sliding cavity is formed in the sliding hole, the fixing seat and the armrest side plate are respectively provided with a plurality of second fixing holes, and the pad is provided with a third fixing hole corresponding to the second fixing holes.

[0014] Preferably, the outer edge of the sliding hole is flanged to make the sliding cavity stepped; grooves are formed on the upper and lower end faces of the mounting block.

[0015] Preferably, a protruding ring is formed on the inner wall of the fixing base on the inner side of the second fixing hole, and the protruding ring is fitted into the third fixing hole; the pad is also provided with a plurality of fourth fixing holes, and the fixing base is provided with a fifth fixing hole corresponding to the fourth fixing hole, and a stop post is provided on the outer side of the fifth fixing hole on the outer wall of the fixing base.

[0016] Preferably, the connecting block and the connecting pipe are provided with a plurality of sixth fixing holes, the lower two sides of the connecting plate are provided with flaps, the connecting plate is mounted on the connecting block, and the end of the connecting pipe is clamped between the two flaps and welded to the connecting plate; the upper part of the connecting plate is provided with a first connecting hole, the seat frame is provided with a second connecting hole corresponding to the first connecting hole, the second connecting hole is provided with an assembly post, and a connecting pin is inserted into the first connecting hole and the assembly post so that the seat frame can rotate relative to the connecting plate.

[0017] Preferably, the locking assembly includes a crossbeam fixed between the side panels of the two handrails, and a gas spring whose fixed end is connected to and installed below the crossbeam via a first U-shaped piece, and whose output end is connected to and installed below the connecting pipe via a second U-shaped piece.

[0018] A sofa, characterized in that it includes a sofa frame capable of adjusting the backrest angle as described in any one of the above-mentioned examples.

[0019] This utility model adopts the above-mentioned technical solution and has the following beneficial effects: The solution fixes the backrest frame and the rotating plate, and hinges the rotating plate, seat frame, and armrest side panels respectively. Simultaneously, to improve stability, a sliding guide assembly is provided, making the seat frame more stable during rotation. Specifically, when the human body leans back against the backrest, it drives the rotating plate to rotate relative to the armrest side panel along the second hinge end, while simultaneously pulling the seat frame to rotate along the first and third hinge ends. The connecting tube installed at the lower front side of the seat frame slides on the fixed seat via sliders at both ends. The gas spring between the crossbeam and the connecting tube acts on the connecting tube to provide cushioning and locking, allowing the backrest to be locked at a certain angle. The overall driving method is simple, the structure is simple, the cost is low, reclining is easy, and it is easy for users to operate. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a sofa with an adjustable backrest angle.

[0021] Figure 2 This is a 3D structural diagram of a sofa frame in a seated position.

[0022] Figure 3 This is a 3D structural diagram of the sofa frame when the user is lying down.

[0023] Figure 4 This is a schematic diagram showing the arrangement of the gas spring on the sofa frame.

[0024] Figure 5 This is a schematic diagram of the connection structure of the various components inside the sofa frame.

[0025] Figure 6 This is a schematic diagram of the assembly of the rotating plate.

[0026] Figure 7 This is a schematic diagram of the installation of the rotating plate and the sector plate.

[0027] Figure 8 This is a schematic diagram of the three-dimensional structure of the rotating plate.

[0028] Figure 9 This is a schematic diagram of the installation of the sliding guide assembly in the sofa.

[0029] Figure 10 This is a schematic diagram of the installation of the sliding guide assembly from another perspective.

[0030] Figure 11 This is a three-dimensional structural diagram of the mounting base.

[0031] Figure 12 A three-dimensional structural diagram of the mounting base from another perspective.

[0032] Figure 13 A schematic diagram of the three-dimensional structure of the pad.

[0033] Figure 14 A schematic diagram of the three-dimensional structure of the slider.

[0034] Figure 15 This is a schematic diagram of the assembly of the connecting plate and the seat frame. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Example 1:

[0040] like Figures 2-15 The sofa frame shown includes a seat frame 1 and a backrest frame, and also includes rotating pieces 2 disposed on both sides of the seat frame 1, a sliding guide assembly and a locking assembly disposed below the seat frame 1; one end of the rotating piece 2 is fixedly connected to the backrest frame, and the upper and lower parts of its other end are respectively hinged to the armrest side plate 3 and the seat frame 1; the sliding guide assembly includes a fixing assembly fixed on the two armrest side plates 3, a slider 4 slidably disposed on the fixing assembly, and a connecting assembly connecting the two sliders 4; the two sides of the seat frame 1 are hinged to the upper parts of the two sides of the connecting assembly.

[0041] The backrest frame and rotating plate 2 can rotate around the second hinge end 6 with the armrest side plate 3 under the action of external force to adjust the tilt angle of the backrest frame, drive the seat frame 1 to rotate around the first hinge end 5 with the rotating plate 2, drive the seat frame 1 to rotate around the third hinge end 50 with the connecting component, and drive the slider 4 to slide on the fixed component.

[0042] The locking component acts on the connecting component to lock the slider 4 onto the fixing component, keeping the seat frame 1 and the backrest frame in a locked state.

[0043] In the above technical solution, the sofa frame includes a backrest frame, a seat frame, and a rotating piece rotatably connected between the backrest frame and the seat frame. The lower front side of the seat frame can slide on a fixed component via a connecting assembly. Specifically, the backrest frame is fixed to the rotating piece, and the rotating piece is hinged to the seat frame and armrest side panels respectively. To improve stability, a sliding guide assembly is provided, making the seat frame more stable during rotation. In use, the user leans back against the backrest, causing the rotating piece to rotate relative to the armrest side panel along the second hinge end. Simultaneously, the seat frame is pulled to rotate along the first and third hinge ends. The connecting tube installed on the lower front side of the seat frame slides on the fixed base via sliders at both ends. The locking assembly acts on the connecting tube to provide cushioning and locking, allowing the backrest to be locked at a certain angle. The overall driving method is simple, the structure is simple, the cost is low, reclining is easy, and it is easy for the user to operate.

[0044] Furthermore, a sector-shaped plate 7 is fixedly provided on the inner wall of the handrail side panel 3, and a sector-shaped groove 8 is formed on the sector-shaped plate 7. A connecting post 9 is provided on the upper part of the bottom surface of the sector-shaped groove 8. The rotating piece 2 is U-shaped, and a connecting hole 10 is provided on the upper part of the proximal end of the rotating piece 2 to engage with the connecting post 9 so that part of the rotating piece 2 can rotate within the sector-shaped groove 8. In this technical solution, the setting of the sector-shaped plate allows the rotating piece to rotate within a certain angle range of the sector-shaped plate, thus playing a limiting role.

[0045] Furthermore, a fan-shaped cover 11 is fitted onto the outer side of the fan-shaped plate 7, and first fixing holes 12 are correspondingly provided on the handrail side plate 3, the fan-shaped plate 7, the connecting column 9, and the fan-shaped cover 11. In this technical solution, the fan-shaped cover prevents the rotating plate from wobbling and dislodging.

[0046] Furthermore, the distal end of the rotating piece 2 is bent to offset the upper part of the distal end of the rotating piece 2 towards the seat frame 1. The outer wall of the rotating piece 2 is recessed into the inner wall to form a convex wall 13. The convex wall 13 extends to both sides in a U-shape, and the edge of the convex wall 13 forms a reinforcing rib 14. In this technical solution, the bending of the distal end of the rotating piece facilitates connection with the backrest frame, while the formation of the convex wall and the reinforcing rib makes the structure of the rotating piece more stable.

[0047] Furthermore, a sliding cavity 15 is formed on the fixing component, and the slider 4 includes a mounting block 16 adapted to slide and locked in the sliding cavity 15, and a connecting block 17 extending out of the sliding cavity 15 and fixed to the connecting component; the connecting component includes a connecting pipe 18 fixedly connected to the sliders 4 on both sides, and a connecting plate 19 disposed at both ends of the connecting pipe 18 and extending upward, and the two sides of the seat frame 1 are hinged to the upper part of the connecting plate 19; the fixing component is inclined downward from the outside to the inside, and includes a fixing seat 20 and a pad 21 padded between the fixing seat 20 and the side plate, the fixing seat 20 is provided with a sliding hole 22, and the pad 21 fits against the inner wall of the fixing seat 20 so that the sliding cavity 15 is formed in the sliding hole 22, the fixing seat 20 and the armrest side plate 3 are provided with a plurality of second fixing holes 23, and the pad 21 is provided with a third fixing hole 24 corresponding to the second fixing hole 23.

[0048] In the above technical solution, the connecting tube and the slider are fixedly connected. The mounting block on the slider is fitted into the sliding cavity of the fixing component and slides. The structure is stable, making it difficult for the connecting tube to detach, thus making the movement and rotation of the seat frame more stable. Specifically, when adjusting the position of the seat frame, the human body applies force to the seat frame, and the seat frame slides inward through the cooperation of the connecting tube and the fixing component. At the same time, the seat frame rotates around the upper part of the connecting plate, thereby adjusting the angle of the seat frame. The fixing component tilts downward from the outside to the inside, that is, the seat frame slides downward and inward and rotates at a certain angle. The pad is fixed on the inner wall of the fixing seat to close one side of the sliding hole, which facilitates the movement of the mounting block in the sliding cavity and avoids contact and wear with the side plate. At the same time, the pad can achieve a tight fit between the fixing seat and the side plate, making the overall structure more stable.

[0049] Furthermore, the outer edge of the sliding hole 22 is provided with a flange 25 to make the sliding cavity 15 stepped; grooves 26 are formed on the upper and lower end faces of the mounting block 16. In this technical solution, the flange on the outer edge of the sliding hole can effectively prevent the mounting block from detaching, and the anti-detachment effect is good. The grooves formed on the upper and lower end faces of the mounting block can reduce the friction between the upper and lower end faces of the mounting block and the inner walls of the upper and lower ends of the sliding cavity, making its sliding smoother and more stable.

[0050] Furthermore, a protruding ring 27 is formed on the inner wall of the fixing base 20 on the inner side of the second fixing hole 23, and the protruding ring 27 is adapted to be fitted into the third fixing hole 24; the pad 21 is also provided with a plurality of fourth fixing holes 28, and the fixing base 20 is provided with a fifth fixing hole 29 corresponding to the fourth fixing holes 28, and a stop post 30 is provided on the outer side of the fifth fixing hole 29 on the outer wall of the fixing base 20. In this technical solution, the protruding ring of the fixing base is fitted into the second fixing hole of the pad, which can effectively prevent radial movement between the two and further improve the structural stability between them. The fourth fixing hole and the fifth fixing hole are respectively inserted into the connecting piece for fixed connection, which further improves the stability of the two and makes the fixing base less likely to detach; the stop post facilitates the insertion and connection of the connecting piece.

[0051] Furthermore, the connecting block 17 and the connecting pipe 18 are respectively provided with a plurality of sixth fixing holes 31. The lower two sides of the connecting plate 19 are provided with flaps 32. The connecting plate 19 is mounted on the connecting block 17, and the end of the connecting pipe 18 is fitted between the flaps 32 on both sides and welded to the connecting plate 19. The upper part of the connecting plate 19 is provided with a first assembly hole 38, and the seat frame 1 is provided with a second assembly hole corresponding to the first assembly hole 38. An assembly post 33 is provided on the second assembly hole. Connecting pins are inserted into the first assembly hole 38 and the assembly post 33 to allow the seat frame 1 to rotate relative to the connecting plate 19. In this technical solution, the connecting pipe is fixedly connected to the connecting block on the slider, and the connecting pipe and the slider are linked. At the same time, the end of the connecting pipe is fixedly connected to the connecting plate. The flaps formed at the lower part of the connecting plate fit against the end of the connecting pipe and are welded to it, increasing the welding area between the connecting pipe and the connecting plate and improving structural stability. The upper part of the connecting plate is hinged to the seat frame, allowing the seat frame to move inward while simultaneously rotating at a small angle.

[0052] Furthermore, the locking assembly includes a crossbeam 34 fixed between the two side armrest plates 3, and a gas spring 36 whose fixed end is connected to and installed below the crossbeam 34 via a first U-shaped piece 35. The output end of the gas spring 36 is connected to and installed below the connecting pipe 18 via a second U-shaped piece 37. In this technical solution, one end of the gas spring is installed on the crossbeam, and the other end is the output end that acts on the connecting pipe, playing a role in buffering and locking the connecting pipe. Moreover, both ends of the gas spring are hinged to the two U-shaped pieces on both sides. Example 2:

[0053] like Figure 1 The sofa shown includes a sofa frame with an adjustable backrest angle, as described in Embodiment 1.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A sofa frame capable of adjusting the angle of the backrest, comprising a seat frame (1) and a backrest frame, characterized in that: Further comprising rotating pieces (2) arranged on both sides of the seat frame (1), a sliding guide assembly arranged below the seat frame (1), and a locking assembly; one end of the rotating piece (2) is fixedly connected with the backrest frame, and the other end is hingedly connected with the armrest side plate (3) and the seat frame (1); the sliding guide assembly comprises a fixed assembly fixed on both sides of the armrest side plate (3), a sliding block (4) slidably arranged on the fixed assembly, and a connecting assembly connected between the two sliding blocks (4), and the two sides of the seat frame (1) are hingedly connected with the upper parts of the two sides of the connecting assembly; the backrest frame and the rotating piece (2) can rotate around the second hinged end (6) of the armrest side plate (3) under the action of an external force to adjust the inclination angle of the backrest frame, drive the seat frame (1) to rotate around the first hinged end (5) of the rotating piece (2), and drive the seat frame (1) to rotate around the third hinged end (50) of the connecting assembly, and drive the sliding block (4) to slide on the fixed assembly; the locking assembly can act on the connecting assembly to lock the sliding block (4) on the fixed assembly, so that the seat frame (1) and the backrest frame are kept in a locked state.

2. The sofa frame capable of adjusting the angle of the backrest according to claim 1, characterized in that: A fan-shaped plate (7) is fixedly arranged on the inner wall of the armrest side plate (3), a fan-shaped groove (8) is formed in the fan-shaped plate (7), and a connecting column (9) is arranged on the upper part of the bottom surface of the fan-shaped groove (8); the rotating piece (2) is U-shaped, a connecting hole (10) is arranged on the upper part of the proximal end of the rotating piece (2) to be connected with the connecting column (9), so that part of the rotating piece (2) can rotate in the fan-shaped groove (8).

3. The sofa frame capable of adjusting the angle of the backrest according to claim 2, characterized in that: A fan-shaped cover (11) is arranged on the outer side of the fan-shaped plate (7), and first fixing holes (12) are arranged on the armrest side plate (3), the fan-shaped plate (7), the connecting column (9) and the fan-shaped cover (11) correspondingly.

4. The sofa frame capable of adjusting the angle of the backrest according to claim 2, characterized in that: The distal end of the rotating piece (2) is bent to offset the upper part of the distal end of the rotating piece (2) to the side of the seat frame (1), the outer wall of the rotating piece (2) is recessed to form a convex wall (13) on the inner wall, the convex wall (13) extends to both sides in a U shape, and the edge of the convex wall (13) forms a reinforcing rib (14).

5. The sofa frame capable of adjusting the angle of the backrest according to claim 1, wherein: A sliding cavity (15) is formed in the fixed assembly, the sliding block (4) comprises a mounting block (16) adapted to slide and fitted in the sliding cavity (15), and a connecting block (17) extending out of the sliding cavity (15) and fixed with the connecting assembly; the connecting assembly comprises a connecting pipe (18) fixedly connected with the two sliding blocks (4), and connecting plates (19) arranged at both ends of the connecting pipe (18) and extending upward, and the two sides of the seat frame (1) are hingedly connected with the upper parts of the connecting plates (19); the fixed assembly is inclined downward from outside to inside, and comprises a fixed seat (20) and a pad plate (21) padded between the fixed seat (20) and the side plate, a sliding hole (22) is arranged through the fixed seat (20), and the pad plate (21) is attached to the inner wall of the fixed seat (20) to form the sliding cavity (15) in the sliding hole (22), a plurality of second fixing holes (23) are arranged on the fixed seat (20) and the armrest side plate (3) correspondingly, and a third fixing hole (24) corresponding to the second fixing hole (23) is arranged on the pad plate (21).

6. The sofa frame capable of adjusting the angle of the backrest according to claim 5, characterized in that: The outer side edge of the sliding hole (22) is provided with a turnup (25) to make the sliding cavity (15) stepped; the upper and lower end faces of the mounting block (16) are formed with grooves (26).

7. The sofa frame capable of adjusting the angle of the backrest according to claim 5, characterized in that: The inner wall of the fixing seat (20) is formed with a convex ring (27) inside the second fixing hole (23), which is adapted to be clamped in the third fixing hole (24); the spacer plate (21) is further provided with a plurality of fourth fixing holes (28), and the fixing seat (20) is provided with fifth fixing holes (29) corresponding to the fourth fixing holes (28), and the outer side of the fifth fixing holes (29) is provided with a blocking column (30) on the outer wall of the fixing seat (20).

8. The sofa frame capable of adjusting the angle of the backrest according to claim 7, characterized in that: The connecting block (17) and the connecting pipe (18) are correspondingly provided with a plurality of sixth fixing holes (31), the lower part of the connecting plate (19) is provided with turnups (32) on both sides, the connecting plate (19) is arranged on the connecting block (17), the end of the connecting pipe (18) is clamped between the two turnups (32) and is welded and fixed with the connecting plate (19); the upper part of the connecting plate (19) is provided with a first assembly hole (38), the seat frame (1) is provided with a second assembly hole corresponding to the first assembly hole (38), the second assembly hole is provided with an assembly column (33), and a connecting pin is penetrated through the first assembly hole (38) and the assembly column (33) to enable the seat frame (1) to rotate relative to the connecting plate (19).

9. The sofa frame capable of adjusting the angle of the backrest according to claim 5, characterized in that: The locking assembly includes a cross beam (34) fixed between the two side armrest side plates (3), and a gas rod (36) fixed at the end and connected to the cross beam (34) below through a first U-shaped piece (35), and the output end of the gas rod (36) is connected and installed below the connecting pipe (18) through a second U-shaped piece (37).

10. A sofa characterized in that: The sofa frame capable of adjusting the angle of the backrest comprises the sofa frame capable of adjusting the angle of the backrest according to any one of claims 1-9.

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