Stretching mechanism and sofa

Abstract

The stretching mechanism comprises a seat frame assembly, a foot support assembly, a backrest assembly and a stretching assembly, the stretching assembly comprises a connecting rod part, a driving part and a control device, the connecting rod part is provided with a first limiting part, the control device comprises a pressing part and an elastic part, and the pressing part is provided with a second limiting part. When the seat is in a sitting posture, the first limiting part and the second limiting part are matched to limit the connecting rod part, and the foot support assembly and the backrest assembly are kept in the sitting posture state; the first limiting component and the second limiting component can be separated by pressing the pressing part, the driving component drives the connecting rod component to move, the connecting rod component drives the backrest assembly and the foot support assembly to move, and posture switching is completed. The seat is driven by the driving part to be switched from the sitting posture to the lying posture, force application is uniform and stable, external force does not need to be applied to the backrest assembly by a human body, and simplicity, convenience and labor saving are achieved.

Description

Technical Field

[0001] This application relates to the technical field of household products, and particularly relates to a stretching mechanism and a sofa. Background Art

[0002] A recliner is a type of chair that can be used for lying or sitting. Some recliners in the related art rely on the squeezing force on the backrest when a person leans backward to change the angle of the chair. There are also some recliners that are manually controlled and use the pulling force of a spring and the pushing force of the human body in a sitting position to unfold and retract. Such a design requires a relatively large force exerted by the human body to achieve the posture conversion, and it cannot be easily and conveniently switched during use. Summary of the Utility Model

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application proposes a stretching mechanism that is labor-saving, has a stable movement, and is simple and convenient for posture switching.

[0004] This application also proposes a sofa using the above-mentioned stretching mechanism.

[0005] The stretching mechanism described in the embodiments of this application includes:

[0006] A seat frame assembly;

[0007] A footrest assembly, which is rotatably installed on the seat frame assembly;

[0008] A backrest assembly, which is rotatably installed on the seat frame assembly;

[0009] A stretching assembly, which includes a link member, a driving member, and a control device. The link member is used to link the backrest assembly and the footrest assembly, and the driving member is used to drive the link member to move relative to the seat frame assembly to drive the backrest assembly and the footrest assembly to move;

[0010] Wherein, the link member is provided with a first limiting member, the control device includes a pressing portion rotatably installed on the seat frame assembly and an elastic member for connecting the pressing portion and the driving member, and the pressing portion is provided with a second limiting member that cooperates with the first limiting member.

[0011] An extension mechanism according to an embodiment of the first aspect of the present application has at least the following beneficial effects: An extension mechanism of the present application includes a seat frame assembly, a footrest assembly, a backrest assembly, and an extension assembly. The extension assembly includes a linkage member, a driving member, and a control device. The linkage member is used to link the backrest assembly and the footrest assembly. The linkage member is provided with a first limiting member. The control device includes a pressing portion and an elastic member. The pressing portion is provided with a second limiting member. When the seat is in a sitting position, the first limiting member and the second limiting member cooperate to limit the linkage member, and the driving member cannot drive the linkage member to move. The footrest assembly and the backrest assembly are maintained in the sitting position. When the seat needs to be switched from the sitting position to the lying position, by pressing the pressing portion, the first limiting member and the second limiting member can be separated, and the driving member drives the linkage member to move. The linkage member drives the backrest assembly and the footrest assembly to move to complete the posture switch. By driving the seat to switch from the sitting position to the lying position through the driving member, the force is uniform and stable, and there is no need for the human body to apply an external force to the backrest assembly, which is simple, convenient, and labor-saving. When the seat needs to be switched from the lying position to the sitting position, the human body sits up and the human feet are retracted downward to drive the footrest assembly to move. The footrest assembly drives the linkage member to reset to the position where the first limiting member and the second limiting member cooperate to complete the locking of the linkage member, so that the footrest assembly and the backrest assembly are restored and maintained in the sitting position. Since the human body sits up and leaves the backrest assembly, no pressure is applied to the backrest assembly. At this time, only a small force is required to drive the footrest assembly, the linkage member, and the backrest assembly to move and reset, and the posture switch is simple and convenient, and the operation is labor-saving.

[0012] According to some embodiments of the present application, the pressing portion includes a pressing piece, a connecting strip, and a connecting shaft. The connecting strip is rotatably installed on the seat frame assembly. The elastic member is arranged between the connecting shaft and the driving member. The seat frame assembly is provided with a limiting groove, and the connecting shaft is movably installed in the limiting groove.

[0013] According to some embodiments of the present application, the first limiting member is a clamping groove provided on the linkage member, and the second limiting member is a shaft body provided on the seat frame assembly.

[0014] According to some embodiments of the present application, the linkage member includes a first link, a second link, and a third link. The driving member is connected to the second link. The first limiting member is arranged on the first link. One end of the first link is rotatably connected to the backrest assembly, and the other end of the first link is rotatably connected to the second link. One end of the second link is rotatably installed on the seat frame assembly, and the other end of the second link is rotatably connected to the third link. One end of the third link is rotatably connected to the second link, and the other end of the third link is rotatably connected to the footrest assembly.

[0015] According to some embodiments of the present application, a first limiting member is provided on the seat frame assembly, and the first limiting member is used to limit the movement of the second connecting rod.

[0016] According to some embodiments of the present application, the footrest assembly includes a footrest support portion and a footrest swing member. The footrest swing member is used to connect the footrest support portion and the seat frame assembly, and the connecting rod member is rotatably connected to the footrest swing member.

[0017] According to some embodiments of the present application, the footrest swing member includes a first connecting member, a second connecting member, a first footrest swing rod, and a second footrest swing rod. The first connecting member and the second connecting member are rotatably mounted on the seat frame assembly. Two ends of the first footrest swing rod are respectively rotatably connected to the first connecting member and the footrest support portion, and two ends of the second footrest swing rod are respectively rotatably connected to the second connecting member and the footrest support portion.

[0018] According to some embodiments of the present application, the elastic member is provided as a spring, and two ends of the spring are respectively connected to the pressing portion and the driving member.

[0019] According to some embodiments of the present application, the seat frame assembly includes a fixed frame, a frame body, and a connecting frame. Support feet are provided at the bottom of the fixed frame. The footrest assembly is rotatably mounted on the frame body, and the backrest assembly is rotatably mounted on the frame body. The fixed frame and the frame body are connected and fixed through the connecting frame.

[0020] The sofa according to the second aspect embodiment of the present application includes an extension mechanism as described in the first aspect embodiment above.

[0021] The sofa according to the second aspect embodiment of the present application has at least the following beneficial effects: The sofa of the present application includes a stretching mechanism, which includes a seat frame assembly, a footrest assembly, a backrest assembly, and a stretching assembly. The stretching assembly includes a link member, a driving member, and a control device. The link member is used to link the backrest assembly and the footrest assembly. The link member is provided with a first limiting member. The control device includes a pressing portion and an elastic member. The pressing portion is provided with a second limiting member. When the seat is in the sitting position, the first limiting member and the second limiting member cooperate to limit the link member, and the driving member cannot drive the link member to move. The footrest assembly and the backrest assembly are maintained in the sitting position. When the seat needs to be switched from the sitting position to the lying position, by pressing the pressing portion, the first limiting member and the second limiting member can be separated, and the driving member drives the link member to move. The link member drives the backrest assembly and the footrest assembly to move, completing the posture switch. By driving the seat to switch from the sitting position to the lying position by the driving member, the force is uniform and stable, and there is no need for the human body to apply an external force to the backrest assembly, which is simple, convenient, and labor-saving. When the seat needs to be switched from the lying position to the sitting position, the human body sits up and the human feet are retracted downward to drive the footrest assembly to move. The footrest assembly drives the link member to reset to the position where the first limiting member and the second limiting member cooperate, completing the locking of the link member, and the footrest assembly and the backrest assembly are restored and maintained in the sitting position. Since the human body sits up and leaves the backrest assembly, no pressure is applied to the backrest assembly. At this time, only a small force is required to drive the footrest assembly, the link member, and the backrest assembly to move and reset, and the posture switch is simple, convenient, and labor-saving in operation.

[0022] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 is a schematic structural diagram of a stretching mechanism according to an embodiment of the present application in the sitting position;

[0025] Figure 2 is Figure 1 an enlarged structural diagram of the portion A shown;

[0026] Figure 3 is a schematic structural diagram of a stretching mechanism according to an embodiment of the present application in the lying position;

[0027] Figure 4 is Figure 3 an enlarged structural diagram of the portion B shown.

[0028] Reference Signs:

[0029] Backrest assembly 100;

[0030] Seat frame assembly 200, fixing frame 210, support feet 211, connecting frame 220, frame body 230, first limiting member 240;

[0031] Footrest assembly 300, footrest support part 310, first connecting member 311, second connecting member 321, first footrest swing rod 312, second footrest swing rod 322;

[0032] Link member 400, first link 410, second link 420, third link 430, first limiting member 411, second limiting member 412;

[0033] Drive member 500;

[0034] Elastic member 600;

[0035] Pressing piece 710, connecting bar 720, connecting shaft 730. Detailed implementation manners

[0036] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, in which 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 by referring to the drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application.

[0037] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, inside, outside, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0038] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or the sequence of the indicated technical features.

[0039] In the description of the present application, unless otherwise clearly defined, terms such as setting, installing, connecting, assembling, fitting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0040] The following refers toFigures 1 to 4 Describe an extension mechanism according to an embodiment of the present application.

[0041] An extension mechanism according to an embodiment of the present application, with reference to Figures 1 to 4 , includes a seat frame assembly 200, a footrest assembly 300, a backrest assembly 100 and an extension assembly. The footrest assembly 300 is rotatably mounted on the seat frame assembly 200, the backrest assembly 100 is rotatably mounted on the seat frame assembly 200. The extension assembly includes a link member 400, a driving member 500 and a control device. The link member 400 is used to link the backrest assembly 100 and the footrest assembly 300. The driving member 500 drives the link member 400 to move relative to the seat frame assembly 200. Under the action of the driving member 500, the link member 400 drives the backrest assembly 100 and the footrest assembly 300 to move, realizing the adjustment of the posture. The control device includes a pressing part and an elastic member 600. The pressing part is rotatably mounted on the seat frame assembly 200. The elastic member 600 is used to connect the pressing part and the driving member 500. The link member 400 is provided with a first limiting member 411, and the pressing part is provided with a second limiting member 412. The first limiting member 411 is used to cooperate with the second limiting member 412 to realize the limiting of the link member 400. Specifically, when the seat is in the sitting posture, the first limiting member 411 cooperates with the second limiting member 412 to limit the link member 400, and the driving member 500 cannot drive the link member 400 to move. The footrest assembly 300 and the backrest assembly 100 are maintained in the sitting posture. When the seat needs to be switched from the sitting posture to the lying posture, by pressing the pressing part, the first limiting member 411 and the second limiting member 412 can be separated. The driving member 500 drives the link member 400 to move. The link member 400 drives the backrest assembly 100 and the footrest assembly 300 to move, completing the switching of the posture. By driving the seat to switch from the sitting posture to the lying posture through the driving member 500, the force is uniform and stable, and there is no need for the human body to apply an external force to the backrest assembly 100, which is simple, convenient and labor-saving. An elastic member 600 is provided between the pressing part and the driving member 500. After the pressing is completed, the pressing part rebounds and resets under the action of the elastic member 600. When the seat needs to be switched from the lying posture to the sitting posture, when the human body sits up and the human feet are retracted downward, it drives the footrest assembly 300 to move. The footrest assembly 300 drives the link member 400 and the backrest assembly 100 to move. The link member 400 moves back to the position where it cooperates with the second limiting member 412, and cooperates with the pressing part that rebounds and resets to complete the locking of the link member 400, so that the footrest assembly 300 and the backrest assembly 100 are restored and maintained in the sitting posture, waiting for the next posture conversion. Since the human body sits up and leaves the backrest assembly 100, no pressure is applied to the backrest assembly 100. At this time, only a small force is required to drive the footrest assembly 300, the link member 400 and the backrest assembly 100 to move back, and the posture switching is simple and convenient, and the operation is labor-saving.

[0042] It should be noted that in some embodiments, the driving component 500 is set as a cylinder. When the seat is in the sitting position, at this time, the first limiting component 411 and the second limiting component 412 cooperate to limit the connecting rod component 400, the cylinder is in a compressed state, and the driving component 500 cannot drive the connecting rod component 400 to move, and the footrest assembly 300 and the backrest assembly 100 are maintained in the sitting position. When the seat is switched from the sitting position to the lying position, the first limiting component 411 is separated from the second limiting component 412, the connecting rod component 400 is not restricted, and the cylinder in the compressed state has a driving force to extend outwards. The cylinder extends outwards to drive the connecting rod component 400 to move, and the connecting rod component 400 drives the backrest assembly 100 and the footrest assembly 300 to move, completing the posture switch. By driving the seat to switch from the sitting position to the lying position by the cylinder, the force is uniform and stable, and there is no need for the human body to apply an external force to the backrest assembly 100, which is simple, convenient and labor-saving. It can be understood that in some other embodiments, the driving component 500 is set as an electric cylinder, and the electric cylinder realizes extension and contraction by receiving signals, and can also drive the connecting rod component 400 to move uniformly and stably, completing the smooth switch of the posture.

[0043] According to some embodiments of the present application, the pressing part includes a pressing piece 710, a connecting strip 720 and a connecting shaft 730. The connecting strip 720 is rotatably installed on the seat frame assembly 200. The elastic component 600 is arranged between the connecting shaft 730 and the driving component 500. The seat frame assembly 200 is provided with a limiting groove, and the connecting shaft 730 is movably installed in the limiting groove. The pressing part is suitable for being pressed by hand. Specifically, the pressing part includes a pressing piece 710 and a connecting strip 720. The connecting strip 720 is rotatably installed on the seat frame assembly 200. The pressing piece 710 is arranged at the end of the connecting strip 720. The seat frame assembly 200 is provided with a limiting groove, and the connecting shaft 730 is movably installed in the limiting groove. When the seat needs to be switched from the sitting position to the lying position, by pressing the pressing piece 710 by hand, the pressing piece 710 drives the connecting strip 720 to move relative to the seat frame assembly 200. The movement of the connecting strip 720 separates the first limiting component 411 from the second limiting component 412, and the connecting rod component 400 is no longer locked. The driving component 500 can drive the connecting rod component 400 to move, and the connecting rod component 400 drives the backrest assembly 100 and the footrest assembly 300 to move, completing the posture switch. The seat frame assembly 200 is provided with a limiting groove, and an elastic component 600 is arranged between the pressing part and the driving component 500. The elastic component 600 can drive the pressing part to rebound after pressing. The limiting groove limits the downward pressure and rebound of the connecting shaft 730, and controls the stroke of the pressing part.

[0044] According to some embodiments of the present application, the first limiting member 411 is a clamping groove provided on the link member 400, and the second limiting member 412 is a shaft body provided on the seat frame assembly 200. The link member 400 is provided with the first limiting member 411, and the pressing portion is provided with the second limiting member 412. The first limiting member 411 is set as a clamping groove, and the second limiting member 412 is set as a shaft body adapted to the clamping groove. When the seat is in the sitting position, the shaft body on the seat frame assembly 200 is placed in the clamping groove to limit the link member 400, and the driving member 500 cannot drive the link member 400 to move, and the footrest assembly 300 and the backrest assembly 100 are maintained in the sitting position. When the seat needs to be switched from the sitting position to the lying position, a person presses the pressing piece 710, and the pressing piece 710 drives the connecting strip 720 to move relative to the seat frame assembly 200. The connecting strip 720 drives the link member 400 to move away from the shaft body. The link member 400 is no longer locked by the shaft body, and the driving member 500 can drive the link member 400 to move. The link member 400 drives the backrest assembly 100 and the footrest assembly 300 to move to complete the posture switching.

[0045] According to some embodiments of the present application, the link member 400 includes a first link 410, a second link 420, and a third link 430. The first limiting member 411 is provided on the first link 410. One end of the first link 410 is rotatably connected to the backrest assembly 100, and the other end of the first link 410 is rotatably connected to the second link 420. One end of the second link 420 is rotatably installed on the seat frame assembly 200, and the other end of the second link 420 is rotatably connected to the third link 430. One end of the third link 430 is rotatably connected to the second link 420, and the other end of the third link 430 is rotatably connected to the footrest assembly 300. The driving member 500 drives the link member 400 to move relative to the seat frame assembly 200. The link member 400 drives the backrest assembly 100 and the footrest assembly 300 to move under the action of the driving member 500 to realize the adjustment of the posture. When the seat is switched from the sitting position to the lying position, the first limiting member 411 and the second limiting member 412 are separated, and the driving member 500 drives the second link 420 to move. The second link 420 drives the first link 410 and the third link 430 to move. The first link 410 drives the backrest assembly 100 to move, and the third link 430 drives the footrest assembly 300 to move to complete the posture switching.

[0046] According to some embodiments of the present application, a first limiting member 240 is provided on the seat frame assembly 200, and the first limiting member 240 is used to limit the movement of the second connecting rod 420. The first limiting member 240 is provided on the seat frame assembly 200. One end of the second connecting rod 420 is rotatably installed on the seat frame assembly 200. When the seat is switched from the sitting position to the lying position, the driving member 500 drives the second connecting rod 420 to move. The setting of the first limiting member 240 can limit the movement of the second connecting rod 420 and control the movement stroke of the second connecting rod 420.

[0047] According to some embodiments of the present application, the footrest assembly 300 includes a footrest support portion 310 and a footrest swing member. The footrest swing member is used to connect the footrest support portion 310 and the seat frame assembly 200, and the link member 400 is rotatably connected to the footrest swing member. The footrest assembly 300 is rotatably installed on the seat frame assembly 200. Specifically, the footrest assembly 300 includes a footrest support portion 310 and a footrest swing member. The link member 400 drives the footrest swing member to move, and the footrest swing member drives the footrest support portion 310 to move, so as to push out and flip the footrest support portion 310 retracted at the bottom of the seat frame assembly 200 to be flush with the seat frame assembly 200 to support the human foot.

[0048] According to some embodiments of the present application, the footrest swing member includes a first connecting member 311, a second connecting member 321, a first footrest swing rod 312, and a second footrest swing rod 322. The first connecting member 311 and the second connecting member 321 are rotatably installed on the seat frame assembly 200. Two ends of the first footrest swing rod 312 are respectively rotatably connected to the first connecting member 311 and the footrest support portion 310, and two ends of the second footrest swing rod 322 are respectively rotatably connected to the second connecting member 321 and the footrest support portion 310. The driving member 500 drives the link member 400 to move. The footrest swing member is rotatably connected to the link member 400. The first connecting member 311 and the second connecting member 321 are rotatably installed on the seat frame assembly 200. The rotation of the first connecting member 311 and the second connecting member 321 drives the first footrest swing rod 312 and the second footrest swing rod 322 to extend outwards, and the footrest support portion 310 is flipped upwards under the action of the first footrest swing rod 312 and the second footrest swing rod 322 to support the human foot.

[0049] According to some embodiments of the present application, the elastic member 600 is provided as a spring, and both ends of the spring are respectively connected to the pressing portion and the driving member 500. The elastic member 600 is used to connect the pressing portion and the driving member 500. The elastic member 600 is provided as a spring. When switching from a sitting position to a lying position, after the human hand presses down on the pressing portion, the spring can drive the pressing portion to rebound after pressing, so that the pressing portion returns to the initial position; when switching from a lying position to a sitting position, the link member 400 moves under the drive of the footrest assembly 300, and the link member 400 moves to cooperate with the pressing portion, thereby completing the limitation of the link member 400.

[0050] According to some embodiments of the present application, the seat frame assembly 200 includes a fixed frame 210, a frame body 230, and a connecting frame 220. A support foot 211 is provided at the bottom of the fixed frame 210. The footrest assembly 300 is rotatably installed on the frame body 230, and the backrest assembly 100 is rotatably installed on the frame body 230. The fixed frame 210 and the frame body 230 are connected and fixed through the connecting frame 220. A plurality of support feet 211 are provided at the bottom of the fixed frame 210 for supporting the frame body 230. The footrest assembly 300 and the backrest assembly 100 are rotatably installed on the frame body 230, and the fixed frame 210 and the frame body 230 are connected and fixed through the connecting frame 220. The connecting frame 220 can support the frame body 230, so that the footrest assembly 300 and the backrest assembly 100 have sufficient rotation space for posture switching.

[0051] The sofa according to the embodiment of the present application includes a stretching mechanism of the above embodiment, including a seat frame assembly 200, a footrest assembly 300, a backrest assembly 100 and a stretching assembly. The stretching assembly includes a connecting rod member 400, a driving member 500 and a control device. The connecting rod member 400 is used to link the backrest assembly 100 and the footrest assembly 300. The connecting rod member 400 is provided with a first limiting member 411. The control device includes a pressing portion and an elastic member 600. The pressing portion is provided with a second limiting member 412. When the seat is in the sitting position, the first limiting member 411 cooperates with the second limiting member 412 to limit the connecting rod member 400, and the driving member 500 cannot drive the connecting rod member 400 to move. The footrest assembly 300 and the backrest assembly 100 are maintained in the sitting position. When the seat needs to be switched from the sitting position to the lying position, by pressing the pressing portion, the first limiting member 411 and the second limiting member 412 can be separated. The driving member 500 drives the connecting rod member 400 to move. The connecting rod member 400 drives the backrest assembly 100 and the footrest assembly 300 to move to complete the posture switching. By driving the seat to switch from the sitting position to the lying position by the driving member 500, the force is uniform and stable, and there is no need for the human body to apply an external force to the backrest assembly 100, which is simple, convenient and labor-saving. When the seat needs to be switched from the lying position to the sitting position, the human body sits up and the human feet are retracted downward to drive the footrest assembly 300 to move. The footrest assembly 300 drives the connecting rod member 400 to reset to the position where the first limiting member 411 cooperates with the second limiting member 412, completing the locking of the connecting rod member 400, and making the footrest assembly 300 and the backrest assembly 100 return to and maintain the sitting position. Since the human body sits up and leaves the backrest assembly 100, no pressure is applied to the backrest assembly 100. At this time, only a small force is required to drive the footrest assembly 300, the connecting rod member 400 and the backrest assembly 100 to move and reset, and the posture switching is simple and convenient, and the operation is labor-saving.

[0052] The above has described the embodiments of the present application in detail with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present application.

Claims

1. A stretching mechanism, characterized in that: include: Seat frame assembly; A footrest assembly, the footrest assembly being rotatably mounted on the seat frame assembly; A backrest assembly, the backrest assembly being rotatably mounted on the seat frame assembly; An extension assembly, the extension assembly comprising a connecting rod component, a driving component and a control device, the connecting rod component is used to link the backrest component and the footrest component, and the driving component is used to drive the connecting rod component to move relative to the seat frame component to drive the backrest component and the footrest component to move; Wherein, the connecting rod component is provided with a first limiting component, the control device includes a pressing part rotatably mounted on the seat frame assembly and an elastic component for connecting the pressing part and the driving component, and the pressing part is provided with a second limiting component cooperating with the first limiting component.

2. A stretching mechanism according to claim 1, characterized in that: The pressing part includes a pressing plate, a connecting strip and a connecting shaft. The connecting strip can be rotatably mounted on the seat frame assembly. The elastic component is arranged between the connecting shaft and the driving component. The seat frame assembly is provided with a limiting groove, and the connecting shaft can be movably mounted in the limiting groove.

3. The stretching mechanism according to claim 1, characterized in that: The first limiting component is a clamping groove arranged on the connecting rod component, and the second limiting component is a shaft body arranged on the seat frame assembly.

4. The stretching mechanism according to claim 1, characterized in that: The connecting rod component includes a first connecting rod, a second connecting rod and a third connecting rod, the driving component is connected to the second connecting rod, the first limiting component is arranged on the first connecting rod, one end of the first connecting rod is rotatably connected to the backrest assembly, the other end of the first connecting rod is rotatably connected to the second connecting rod, one end of the second connecting rod is rotatably mounted on the seat frame assembly, the other end of the second connecting rod is rotatably connected to the third connecting rod, one end of the third connecting rod is rotatably connected to the second connecting rod, and the other end of the third connecting rod is rotatably connected to the foot rest assembly.

5. A stretching mechanism according to claim 4, characterized in that: The seat frame assembly is provided with a first limiting member, and the first limiting member is used to limit the movement of the second connecting rod.

6. The stretching mechanism according to claim 1, characterized in that: The footrest assembly includes a footrest supporting portion and a footrest swinging component, the footrest swinging component is used to connect the footrest supporting portion and the seat frame assembly, and the connecting rod component is rotatably connected to the footrest swinging component.

7. A stretching mechanism according to claim 6, characterized in that: The footrest swing component includes a first connecting member, a second connecting member, a first footrest swing rod and a second footrest swing rod. The first connecting member and the second connecting member can be rotatably mounted on the seat frame assembly. The two ends of the first footrest swing rod are respectively rotatably connected to the first connecting member and the footrest supporting part, and the two ends of the second footrest swing rod are respectively rotatably connected to the second connecting member and the footrest supporting part.

8. The stretching mechanism according to claim 1, characterized in that: The elastic component is configured as a spring, and two ends of the spring are respectively connected to the pressing portion and the driving component.

9. The stretching mechanism according to claim 1, characterized in that: The seat frame assembly includes a fixing frame, a frame body and a connecting frame. A supporting foot is provided at the bottom of the fixing frame. The footrest assembly can be rotatably mounted on the frame body. The backrest assembly can be rotatably mounted on the frame body. The fixing frame and the frame body are connected and fixed by the connecting frame.

10. A sofa, characterized in that It comprises an extension mechanism as described in any one of claims 1 to 9.

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