A leg support mechanism and a sofa stretching device provided with the same

Abstract

The present application discloses a leg support mechanism, including a folding part for mounting the leg support mechanism on a seat frame, the folding part including two symmetrically arranged folding components, the folding component including a first folding rod, a second folding rod slidably connected to the first folding rod along the length direction of the first folding rod, and a force transmission component rotatably connected to the seat frame, the first folding rod and the second folding rod abut against each other and are relatively fixed along their thickness direction, the force transmission component is used to convert its rotational force into a driving force to drive the first folding rod and the second folding rod to move relative to each other; a force member for providing the force transmission component with a driving force to drive the force transmission component to rotate relative to the seat frame; a mounting part for mounting a sofa leg cushion, the first folding rod rotatably connected to the mounting part, the second folding rod rotatably connected to the mounting part and slidably connected to the mounting part. By adopting the above technical solution, there is no scissor hand structure on the legs, and there is no risk of pinching fingers.

Description

Technical Field

[0001] The present application relates to the field of functional sofas, and in particular to a leg support mechanism and a sofa extension device provided with the mechanism. Background Art

[0002] Functional sofa refers to multifunctional sofa. The most common one is functional sofa: there are two types, one is manual function extension, manual can also be equipped with shaking and rotating function sofa, and the other is electric function extension, electric can also have these two functions of shaking and rotating.

[0003] The structure of the leg rest of the existing functional iron frame is mostly a polygonal connecting rod mechanism. There are gaps between the parts. The gaps will become larger or smaller during operation. If the user's fingers accidentally enter, there is a risk of pinching.

[0004] Application Contents

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a leg support mechanism to reduce the risk of pinching the user.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] A leg support mechanism, comprising

[0008] A folding portion for mounting the leg support mechanism on the seat frame, the folding portion comprising two symmetrically arranged folding components, the folding components comprising a first folding rod, a second folding rod slidably connected to the first folding rod along the length direction of the first folding rod, and a force transmission component rotatably connected to the seat frame, the first folding rod and the second folding rod abut against each other and are relatively fixed along the thickness direction thereof, and the force transmission component is used to convert its rotational force into a driving force for driving the first folding rod and the second folding rod to move relative to each other;

[0009] A force applying member for providing a driving force to the force transmission component to drive the force transmission component to rotate relative to the seat frame;

[0010] The mounting part is used for mounting the sofa leg cushion, the mounting part is provided with two folding components respectively corresponding to the two folding components, the first folding rod is rotatably connected to the mounting part, and the second folding rod is rotatably connected to the mounting part and is slidably connected to the mounting part.

[0011] By adopting the above technical solution, the force transmission component rotates under the action of the force applying member, and the first folding rod and the second folding rod are driven to rotate by the force transmission component, and during the rotation process, the first folding rod and the second folding rod will only slide relative to each other along their own length direction to drive the installation part to move, thereby realizing the deployment of the leg support mechanism.

[0012] When the leg support mechanism needs to be folded, the force transmission component is driven by the force applying member, and the first folding rod and the second folding rod are driven to rotate by the force transmission component. During the rotation process, the first folding rod and the second folding rod slide relative to each other to drive the installation part to move, thereby realizing the folding of the leg support mechanism. The sofa leg cushion installed on the installation part is turned to the side of the seat frame. In this process, there will be no gap between the first folding rod and the second folding rod, so the user will not put his fingers into the gap, and there will be no problem when the leg support mechanism is folded. The probability of pinching hands due to the above reasons is reduced.

[0013] The present application is further configured as follows: the force transmission assembly includes a first transmission rod rotatably connected to the seat frame and a second transmission rod rotatably connected to the seat frame, the first transmission rod is parallel to the second transmission rod, and both the first transmission rod and the second transmission rod are rotatably connected to the second folding rod.

[0014] By adopting the above technical solution, a parallelogram is formed between the seat frame, the first transmission rod, the second transmission rod and the second folding rod, so that the motion structure is more stable and the second folding rod can stably rotate relative to the seat frame.

[0015] The present application is further configured as follows: it also includes a limiting shaft fixedly mounted on the seat frame, and a limiting groove is provided on the side wall of the first transmission rod facing the second transmission rod; when the leg support mechanism is fully extended, the limiting shaft abuts against the limiting groove.

[0016] By adopting the above technical solution, the cooperation between the limit groove and the limit shaft can play a limiting role, so that when the leg support mechanism is fully unfolded, the limit shaft can abut against the limit groove to prevent the leg support mechanism from continuing to move and destroying its unfolded state.

[0017] The present application is further configured as follows: the force-applying member includes a linkage rod and a drive cylinder for providing driving force to the linkage rod, both ends of the linkage rod are respectively fixedly connected to the second transmission rod, and the driving force provided by the drive cylinder to the linkage rod is perpendicular to the linkage rod.

[0018] By adopting the above technical solution, the second transmission rod plays a good linkage role, ensuring that the two folding components can be unfolded and folded synchronously, and the operation is stable.

[0019] The present application is further configured as follows: at least one first guide column is provided on the second folding rod along its length direction, at least one first guide groove is opened on the first folding rod along its length direction, the first guide groove is opened along the length direction of the first folding rod, one first guide groove corresponds to at least one first guide column, and the first guide column is slidably embedded in the first guide groove.

[0020] By adopting the above technical solution, the cooperation between the guide groove and the first guide column can play a limiting role, ensuring that the first folding rod and the second folding rod can only move relative to each other along their length direction, so that no gap will appear between the two, thereby reducing the probability of pinching the hand by putting the hand into the gap.

[0021] The present application is further configured as follows: a limiting block for limiting the first folding rod is provided at one end of the first guide column away from the second folding rod, and the limiting block abuts against the first folding rod.

[0022] By adopting the above technical solution, the first folding rod and the second folding rod can be better abutted together, and there will be no gap between them, which would cause a person to put his hand into the gap and get his hand pinched.

[0023] The present application is further configured as follows: a gasket is disposed on the outer sleeve of the first guide column, and the gasket is located between the first folding rod and the second folding rod and abuts against the first folding rod and the second folding rod.

[0024] By adopting the above technical solution, the friction between the first folding rod and the second folding rod is reduced, so that the two can slide relative to each other more stably.

[0025] The present application is further configured as follows: an ear piece is fixedly provided on a side wall of the first folding rod along one side of its length direction, the ear piece and the first folding rod are located in the same plane, and a second guide column is provided on the second transmission rod, and the second guide column is slidably connected to the ear piece.

[0026] By adopting the above technical solution, a guiding role is further played, and at the same time, when the second transmission rod rotates, a driving force can be exerted on the first folding rod, rather than simply driving the second folding rod. Therefore, the first folding rod and the second folding rod can move relative to each other more efficiently, so that the leg support mechanism can be extended faster.

[0027] The present application is further configured as follows: a second guide groove is provided on the ear piece, a second guide post is slidably connected to the second guide post, and the second guide groove and the first guide groove are configured at an angle.

[0028] By adopting the above technical solution, the first folding rod is guided and supported at multiple points during its movement relative to the second folding rod, so that its movement is more stable.

[0029] Another object of the present application is to provide a sofa extension device:

[0030] To achieve the above objectives, this application provides the following technical solutions:

[0031] A sofa extension device comprises a base frame, a backrest assembly, a seat frame, a leg support mechanism, a linkage mechanism, and an active part;

[0032] The backrest assembly is rotatably connected to the base frame, and the rotation point of the backrest assembly relative to the seat frame is located at one end of the backrest assembly;

[0033] One end of the seat frame is rotatably connected to the backrest assembly, and the other end is rotatably connected to the leg support mechanism, and the seat frame is rotatably connected to the base frame through a linkage mechanism;

[0034] The active member is used to provide a linear thrust to the seat frame along the length direction of the seat frame. One end of the driving member is connected to the linkage mechanism or the seat frame, and the other end is connected to the base frame.

[0035] The present application has the following advantages: 1. There is no scissor-hand structure on the legs, so there is no risk of pinching fingers; 2. It occupies a small space; 3. The leg support mechanism can be unfolded and folded smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the structure of the embodiment in an unfolded state;

[0037] Figure 2 It is a schematic diagram of the structure of the embodiment in a folded state;

[0038] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0039] Figure 4 is a schematic structural diagram of the leg support mechanism of the embodiment in a folded state;

[0040] Figure 5 An exploded view of the leg support mechanism of the embodiment in a state transformation;

[0041] Figure 6 is a structural schematic diagram of the leg support mechanism in a state transformation of the embodiment;

[0042] Figure 7 It is a partial schematic diagram of the embodiment in which the mid-leg support mechanism is in an unfolded state;

[0043] Figure 8 It is a structural schematic diagram of an embodiment in which the mid-leg support mechanism is in an unfolded state.

[0044] Figure numerals: 1, chassis; 2, backrest support rod; 3, seat frame; 4, leg support mechanism; 5, linkage mechanism; 6, driving mechanism; 7, third connecting rod; 8, first connecting rod; 9, second connecting rod; 10, limiting protrusion; 11, limiting surface; 12, active member; 13, force member; 14, first force transmission rod; 15, second force transmission rod; 16, folding part; 17, mounting part; 18, calf support part; 19, mounting platform; 2 0. First folding rod; 21. Second folding rod; 22. First guide column; 23. First guide groove; 24. Gasket; 25. Ear; 26. Second guide groove; 27. Second guide column; 28. First transmission rod; 29. ​​Second transmission rod; 30. Linkage rod; 31. Drive cylinder; 32. Limiting shaft; 33. Limiting groove; 34. Third guide groove; 35. Third guide column; 36. Force exchange rod; 37. Block; 38. Limiting block. DETAILED DESCRIPTION

[0045] Example:

[0046] like Figure 1 As shown, a sofa extension device comprises a base frame 1, a backrest assembly, a seat frame 3, a leg support mechanism 4, a linkage mechanism 5, and a driving mechanism 6. The middle part of the backrest assembly is rotatably connected to the base frame 1, and the rotation point of the backrest assembly relative to the seat frame 3 is located at one end of the backrest assembly; one end of the seat frame 3 is rotatably connected to the backrest assembly, and the other end is rotatably connected to the leg support mechanism 4, and the seat frame 3 is rotatably connected to the base frame 1 through the linkage mechanism 5.

[0047] When the sofa using the stretching device is in a normal sitting state, the leg support mechanism 4 is folded and retracted under the seat frame 3, the angle formed between the backrest assembly and the ground is 113°, the angle formed between the seat frame 3 and the ground is 9°, and the angle formed between the seat frame 3 and the backrest assembly is 99°, thereby putting the person in a comfortable sitting position.

[0048] If a person needs to support his legs, the driving mechanism 6 gives the leg supporting mechanism 4 a driving force along the length direction of the seat frame 3, so that the leg supporting mechanism 4 extends outward until it is parallel to the seat frame 3 as a whole, thereby supporting the user's legs.

[0049] When a person needs to lie on his back, the driving mechanism 6 gives the seat frame 3 a driving force along its length direction, so that the seat frame 3 rotates relative to the base frame 1 and moves slightly forward until the angle between it and the ground reaches 20°. At this time, due to the force transmission of the linkage mechanism 5, the backrest mechanism rotates relative to the seat frame 3 and the base frame 1, so that the angle between the backrest assembly and the ground reaches 150°. This puts the person in a zero-gravity state of lying back, making the user more comfortable. At this time, the leg support mechanism 4 is raised by at least 15 cm.

[0050] like Figure 2As shown in the figure, specifically, the chassis 1 is a U-shaped frame formed by connecting rods. On both sides of the chassis 1, third connecting rods 7 are provided vertically. The third connecting rods 7 are used to connect the backrest assembly. The backrest assembly includes two backrest support rods 2 symmetrically arranged along the length direction of the seat frame 3. The backrest support rods 2 are Z-shaped, and the lower ends of the backrest support rods 2 are rotatably connected to the seat frame 3. The backrest support rods 2 are rotatably connected to the upper ends of the third connecting rods 7, and the rotation points of the backrest support rods 2 and the third connecting rods 7 are located at the second turning point of the backrest support rods 2 from top to bottom. Thus, the backrest assembly is stably rotatably mounted on the chassis 1 through the third connecting rods 7.

[0051] There are two linkage mechanisms 5, and one linkage mechanism 5 corresponds to one backrest support rod 2. The linkage mechanism 5 includes a first connecting rod 8 and a second connecting rod 9 rotatably connected to the first connecting rod 8. One end of the first connecting rod 8 is rotatably connected to one end of the open end of the chassis 1. The end of the first connecting rod 8 away from the chassis 1 is rotatably connected to the middle of the seat frame 3. The second connecting rod 9 is Z-shaped. The rotation point between the second connecting rod 9 and the first connecting rod 8 is located between the rotation point of the first connecting rod 8 relative to the seat frame 3 and the rotation point of the first connecting rod 8 relative to the chassis 1. The end of the second connecting rod 9 away from the first connecting rod 8 is rotatably connected to the backrest support rod 2, and the connection point of the second connecting rod 9 and the backrest support rod 2 is located between the rotation point of the backrest support rod 2 relative to the chassis 1 and the rotation point of the backrest support rod 2 relative to the third connecting rod 7.

[0052] At this time, applying a force along the length direction of the seat frame 3 can drive the seat frame 3 and the backrest support rods 2 to rotate synchronously, and the seat frame 3 can move slightly forward during the rotation to achieve the displacement for the backrest support rods 2, so that the stretching device can better reach the zero-gravity state.

[0053] As Figure 3 shown, in order to make the stretching device better maintain the zero-gravity state, a limiting protrusion 10 is fixedly installed in the middle of the backrest support rod 2. The upper end of the third connecting rod 7 is inclined to form a limiting surface 11; when the stretching device is in the zero-gravity sitting feeling state, the limiting protrusion 10 abuts against the limiting surface 11 on the third connecting rod 7.

[0054] As Figure 2 shown, the drive mechanism 6 includes an active member 12 for providing a linear thrust along the length direction of the seat frame 3 to the seat frame 3 and a force-applying member 13 for providing a linear thrust along the length direction of the seat frame 3 to the leg support mechanism 4. The seat frame 3 includes a first force-transmitting rod 14 arranged along its width direction. The active member 12 is an electric cylinder. The active member 12 is arranged along the length direction of the seat frame 3, and both ends of the active member 12 are rotatably connected to the first force-transmitting rod 14 and the chassis 1 respectively.

[0055] As Figure 4 shown, the leg support mechanism 4 includes:

[0056] A folding portion 16 for mounting the leg support mechanism 4 on the seat frame 3,

[0057] A mounting portion 17 for mounting a sofa leg cushion, the mounting portion 17 being mounted at one end of the folding portion 16;

[0058] A calf support portion 18 for supporting the leg cushion of the sofa, the calf support portion 18 is rotatably connected to the folding portion 16, and a mounting platform 19 is provided on the calf support portion 18;

[0059] During installation, the sofa leg cushions can be installed on both the installation platform 19 and the installation portion 17. When the folding portion 16 is in the ultimate state of unfolding, the upper end surface of the installation platform 19 and the upper end surface of the installation portion 17 are located in the same plane, and the two cushions are assembled into a complete cushion, which can better support the human legs. When the folding portion 16 is folded, the installation platform 19 is perpendicular to the installation portion 17, and the calf support portion 18 is folded below the folding portion 16.

[0060] like Figure 5 and Figure 6 As shown, the folding portion 16 includes two symmetrically arranged folding components, which include a first folding rod 20, a second folding rod 21 slidably connected to the first folding rod 20 along the length direction of the first folding rod 20, and a force transmission component rotatably connected to the seat frame 3. The first folding rod 20 and the second folding rod 21 abut against each other and are relatively fixed along their thickness direction. Specifically, two first guide posts 22 are provided on the second folding rod 21 along its length direction, and two first guide grooves 23 are provided on the first folding rod 20 along its length direction, and the first guide grooves 23 are provided along the length direction of the first folding rod 20. One first guide groove 23 corresponds to one first guide post 22, and the first guide post 22 is slidably embedded in the first guide groove 23.

[0061] like Figure 5 As shown, a gasket 24 is disposed on the outer sleeve of the first guide column 22, and the gasket 24 is located between the first folding rod 20 and the second folding rod 21 and abuts against the first folding rod 20 and the second folding rod 21. A stopper 38 for limiting the first folding rod 20 is disposed at one end of the first guide column 22 away from the second folding rod 21, and the stopper 38 abuts against the first folding rod 20.

[0062] like Figure 5 and Figure 6 As shown, the first folding rod 20 is fixedly provided with an ear piece 25 on one side wall along the length direction thereof, and a second guide groove 26 is provided on the ear piece 25. The ear piece 25 and the first folding rod 20 are located in the same plane, and a second guide column 27 is provided on the second transmission rod 29, and the second guide column 27 is slidably connected to the second guide groove 26.

[0063] like Figure 5 and Figure 6As shown, the force transmission assembly includes a first transmission rod 28 rotatably connected to the seat frame 3 and a second transmission rod 29 rotatably connected to the seat frame 3, the first transmission rod 28 is parallel to the second transmission rod 29, and the first transmission rod 28 and the second transmission rod 29 are both rotatably connected to the second folding rod 21. The force applying member 13 includes a linkage rod 30 and a driving cylinder 31 for applying a driving force to the linkage rod 30, the two ends of the linkage rod 30 are respectively fixedly connected to the second transmission rod 29, and the driving force applied by the driving cylinder 31 to the linkage rod 30 is perpendicular to the linkage rod 30.

[0064] like Figure 5 As shown, a limiting shaft 32 is provided on the seat frame 3, and a limiting groove 33 is provided on the side wall of the first transmission rod 28 facing the second transmission rod 29; when the leg support mechanism 4 is fully extended, the limiting shaft 32 abuts against the limiting groove 33.

[0065] like Figure 5 and Figure 7 As shown, the mounting portion 17 is provided with two and respectively corresponds to two folding components, the first folding rod 20 is rotatably connected to the mounting portion 17, and the second folding rod 21 is rotatably connected to the mounting portion 17 and slidably connected to the mounting portion 17. Specifically, the mounting portion 17 is provided with a third guide groove 34, and the third folding portion 16 is provided with a third guide column 35, and the third guide column 35 is embedded in the third guide groove 34 and slidably connected to the third guide groove 34.

[0066] like Figure 4 and Figure 5 As shown, a force exchange rod 36 is provided between the calf support portion 18 and the first folding rod 20, and both ends of the force exchange rod 36 are rotatably connected to the calf support portion 18 and the first folding rod 20. A stopper 37 is provided on the calf support portion 18. Figure 4 As shown, when the folding portion 16 is in the extreme folding state, the stopper 37 abuts against the force changing rod 36 , and the limit block 38 abuts against the force changing rod 36 .

[0067] In the folded state, Figure 4 As shown, the folding assembly and the force transmission assembly in the leg support mechanism 4 are both in a folded state, the mounting end surface of the mounting portion 17 is perpendicular to the ground, and the mounting platform 19 of the calf support portion 18 is parallel to the ground, so that it is in a state of occupying a small area.

[0068] When the calf support assembly 4 is transformed from the folded state to the unfolded state, the piston rod of the drive cylinder 31 is extended, giving the linkage rod 30 a driving force along the length direction of the seat frame 3, thereby rotating the first transmission rod 28 and the second transmission rod 29. At this time, the first transmission rod 28 and the second transmission rod 29 directly drive the second folding rod 21 to rotate, the first guide column 22 slides in the first guide groove 23, and the second guide column 27 slides in the second guide groove 26, thereby causing the first folding rod 20 and the second folding rod 21 to slide relative to each other.

[0069] When the first folding rod 20 and the second folding rod 21 slide relative to each other, the difference in motion between the first folding rod 20 and the second folding rod 21 forms a driving force on the mounting platform 17, causing the mounting platform 17 to rotate until the mounting platform 17 rotates to a degree that its upper end surface is parallel to the ground. At the same time, the first folding rod 20 rotates, driving the force exchange rod 36 to rotate, and the force exchange rod 26 drives the calf support part 18 to rotate relative to the mounting part 17. When the mounting platform 17 rotates to a degree that its upper end surface is parallel to the ground, the calf support part 18 rotates 9° relative to the mounting platform 17, so that the mounting platform 19 on the calf support part 18 is located in the same plane as the mounting plane of the mounting part 17. At this time, the calf support assembly 4 is fully unfolded and can well support the human leg. At this time, the limit shaft 3 abuts against the limit groove 33.

[0070] When the calf support assembly 4 is transformed from the unfolded state to the folded state, similarly, the piston rod of the drive cylinder 31 is shortened, giving the linkage rod 30 a driving force along the length direction of the seat frame 3, thereby rotating the first transmission rod 28 and the second transmission rod 29, causing the first folding rod 20 and the second folding rod 21 to slide relative to each other. At this time, the calf support part 18 is retracted, as shown in FIG. Figure 6 This is until the stopper 37 is reset to abut against the force exchange rod 36, and the limit block 38 is reset to a state where the force exchange rod 36 is abutted. At this time, the calf support assembly 4 is folded and restored to the folded state.

[0071] In the above process, there will be no gaps between the folding components of the calf support component 4, thereby reducing the probability of pinching the hand by inserting the hand into the gap, thereby greatly improving safety.

[0072] The principles of this application are as follows:

[0073] It includes three states: sitting state, leisure state and zero gravity state;

[0074] When in a sitting position, the leg support mechanism 4 is folded and retracted under the seat frame 3, the angle formed between the backrest assembly and the ground is 113°, the angle formed between the seat frame 3 and the ground is 9°, and the angle formed between the seat frame 3 and the backrest assembly is 99°, thereby putting the person in a comfortable sitting position.

[0075] In the leisure state, that is, the upper body is half-lying and the lower body is supported, the angle between the backrest assembly and the ground is 113°, the angle between the seat frame 3 and the ground is 9°, and the angle between the seat frame 3 and the backrest assembly is 99°. The leg support mechanism 4 extends outward until it is parallel to the seat frame 3 as a whole, so as to support the user's legs. The user is in a comfortable half-lying state. In this state, the user can read books, watch TV, etc.

[0076] like Figure 1As shown, in the zero gravity state, the angle between the backrest assembly and the ground is 150°, the angle between the seat frame 3 and the ground is 20°, the angle between the seat frame 3 and the backrest assembly is 130°, and the leg support mechanism 4 extends outward until it is parallel to the seat frame 3 as a whole, thereby supporting the user's legs. Thus, the person is in a completely supine position in zero gravity for resting and taking a nap.

[0077] When the extension device switches between the sitting state and the leisure state, the piston rod of the force-applying member 13 is extended, and the force-applying member 13 gives the second force-transmitting rod 15 an outward driving force along the length direction of the seat frame 3, and the first leg rod 16 and the second leg rod 17 rotate, thereby driving the third leg rod 18 and the fourth leg rod 19 to rotate, and the knee support block 20 and the foot support rod 22 are extended outward until they are in a straight line with the seat frame 3. At this time, the leg support mechanism 4 is completely extended outward to support the feet. When the piston rod of the force-applying member 13 is shortened, the movement trajectory is reversed, and the leg support mechanism 4 is completely retracted and folded back to the bottom of the seat frame 3, completing the state conversion.

[0078] When the extension device switches between the zero gravity state and the leisure state, the piston rod of the active member 12 extends, giving the first force transmission rod 14 an outward driving force along the length direction of the seat frame 3, and the seat frame 3 rotates relative to the base frame 1, and at the same time moves relative to the base frame 1 away from the backrest assembly. Driven by the linkage mechanism 5, the backrest assembly rotates relative to the seat frame 3, thereby completing the forward tilting of the seat frame 3 and the backward tilting of the backrest assembly, and the complete state conversion. When the piston rod of the force-applying member 13 shortens, the motion trajectory is reversed, the seat frame 3 is reset, and the backrest assembly tilts forward, thereby returning to the leisure state.

[0079] The above is only the preferred implementation of the present application. The protection scope of the present application is not limited to the above embodiments. All technical solutions under the concept of the present application belong to the protection scope of the present application. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present application should also be regarded as the protection scope of the present application.

Claims

1. A leg support mechanism, characterized in that: include A folding portion (16) for mounting the leg support mechanism (4) on the seat frame (3), the folding portion (16) comprising two symmetrically arranged folding components, the folding components comprising a first folding rod (20), a second folding rod (21) slidably connected to the first folding rod (20) along the length direction of the first folding rod (20), and a force transmission component rotatably connected to the seat frame (3), the first folding rod (20) and the second folding rod (21) abutting against each other and being relatively fixed along their thickness direction, the force transmission component being used to convert its rotational force into a driving force for driving the first folding rod (20) and the second folding rod (21) to move relative to each other; A force applying member (13) for providing a driving force to the force transmission component to drive the force transmission component to rotate relative to the seat frame (3); A mounting portion (17) for mounting a sofa leg cushion, the mounting portion (17) being provided with two folding assemblies corresponding to the two folding assemblies respectively, a first folding rod (20) being rotatably connected to the mounting portion (17), and a second folding rod (21) being rotatably connected to the mounting portion (17) and slidably connected to the mounting portion (17); A calf support portion (18) for supporting a sofa leg cushion, the calf support portion (18) being rotatably connected to the folding portion (16); The force transmission assembly comprises a first transmission rod (28) rotatably connected to the seat frame (3) and a second transmission rod (29) rotatably connected to the seat frame (3); the first transmission rod (28) is parallel to the second transmission rod (29); the first transmission rod (28) and the second transmission rod (29) are both rotatably connected to the second folding rod (21); the first folding rod (20) is fixedly provided with an ear piece (25) on a side wall along one side of the length direction thereof; the ear piece (25) and the first folding rod (20) are located in the same plane; the second transmission rod (29) is provided with a second guide column (27); the second guide column (27) is slidably connected to the ear piece (25); the ear piece (25) is provided with a second guide groove (26); the second guide column (27) is slidably connected to the second guide groove (26); the second guide groove (26) and the first guide groove (23) are arranged at an angle.

2. A leg support mechanism according to claim 1, characterized in that: It also includes a limiting shaft (32) fixedly mounted on the seat frame (3); a limiting groove (33) is provided on a side wall of the first transmission rod (28) facing the second transmission rod (29); when the leg support mechanism (4) is fully extended, the limiting shaft (32) abuts against the limiting groove (33).

3. A leg support mechanism according to claim 1, characterized in that: The force applying member (13) comprises a linkage rod (30) and a driving cylinder (31) for applying a driving force to the linkage rod (30); both ends of the linkage rod (30) are respectively fixedly connected to a second transmission rod (29); and the driving force applied by the driving cylinder (31) to the linkage rod (30) is perpendicular to the linkage rod (30).

4. A leg support mechanism according to claim 1, characterized in that: At least one first guide post (22) is provided on the second folding rod (21) along its length direction, and at least one first guide groove (23) is provided on the first folding rod (20) along its length direction. The first guide groove (23) is provided along the length direction of the first folding rod (20), and one first guide groove (23) corresponds to at least one first guide post (22). The first guide post (22) is slidably embedded in the first guide groove (23).

5. A leg support mechanism according to claim 4, characterized in that: A limiting block (38) for limiting the first folding rod (20) is provided at one end of the first guide column (22) away from the second folding rod (21), and the limiting block (10) abuts against the first folding rod (20).

6. A leg support mechanism according to claim 5, characterized in that: A gasket (24) is disposed on the outer cover of the first guide column (22); the gasket (24) is located between the first folding rod (20) and the second folding rod (21) and abuts against the first folding rod (20) and the second folding rod (21).

7. A sofa stretching device, characterized in that: It comprises a base frame (1), a backrest assembly, a seat frame (3), a leg support mechanism (4), a linkage mechanism (5), and an active component (12); The backrest assembly is rotatably connected to the base frame (1), and the rotation point of the backrest assembly relative to the seat frame (3) is located at one end of the backrest assembly; One end of the seat frame (3) is rotatably connected to the backrest assembly, and the other end is rotatably connected to the leg support mechanism (4), and the seat frame (3) is rotatably connected to the base frame (1) via a linkage mechanism (5); The driving member (12) is used to provide the seat frame (3) with a linear thrust along the length direction of the seat frame (3); one end of the driving member is connected to the linkage mechanism (5) or the seat frame (3), and the other end is connected to the base frame (1); The leg support mechanism (4) is the leg support mechanism (4) according to any one of claims 1 to 6.

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