CN111602993A - A sofa stretching device that can provide zero gravity sitting feeling - Google Patents

Abstract

The present application discloses a sofa stretching device capable of providing a zero-gravity sitting feeling, comprising a base frame, a backrest assembly, a seat frame, a leg support mechanism, a linkage mechanism, and a driving mechanism; the backrest assembly is rotatably connected to the base frame, and the backrest assembly The rotation point relative to the seat frame is located at one end of the backrest assembly; one end of the seat frame is rotatably connected to the backrest assembly, the other end is rotatably connected to the leg support mechanism, and the seat frame is rotatably connected to the chassis through a linkage mechanism; When in the zero-gravity sitting state, the first driving member is at the maximum stroke, the angle formed between the backrest assembly and the ground is not less than 150°, and the angle formed between the raised seat frame and the ground is not less than 20°. °Through a simple mechanism, the seat frame and the backrest assembly can be rotated at a larger angle relative to the ground, so that when the user sits on the sofa using the extension device, he can be in a state of zero gravity, allowing people to relax further rest.

Description

A sofa stretching device that can provide zero gravity sitting feeling

technical field

The present application relates to the field of furniture, in particular to a sofa stretching device that can provide a zero-gravity sitting feeling.

Background technique

Sofa is currently suitable for people's various life areas, such as office, living room, bedroom, outdoor and so on. With the development of economy, people use more and more kinds of furniture in daily life, and people have higher and higher requirements for the function of furniture. For example, liftable sofas, rotatable sofas, leisure sofa chairs for the elderly, etc., are more and more popular due to the diversified functions of the above-mentioned products, which are easy to use, comfortable and healthy. The above-mentioned different types of sofas can not only achieve the use functions of traditional sofas, but also the above-mentioned sofa types can be flexibly adjusted according to the use requirements of users, so as to better meet the different use requirements of users.

The existing sofa frame cannot be completely in the zero gravity state in the lying position, that is, the seat frame is not tilted high, and the back support bracket is not close enough to the ground, so that people cannot relax further.

Application content

In view of the deficiencies in the prior art, the purpose of the present application is to provide a sofa stretching device that can provide a zero-gravity sitting feeling, and provides a zero-gravity state, thereby improving the comfort of use.

To achieve the above purpose, the application provides the following technical solutions:

A sofa stretching device capable of providing zero-gravity sitting feeling, comprising a base frame, a backrest assembly, a seat frame, a leg support mechanism, a linkage mechanism, and a drive mechanism;

The backrest assembly is rotatably connected to the chassis, and the pivot point of the backrest assembly relative to the seat frame is located at one end of the backrest assembly;

One end of the seat frame is rotatably connected with the backrest assembly, the other end is rotatably connected with the leg support mechanism, and the seat frame is rotatably connected to the chassis through a linkage mechanism;

The driving mechanism includes a first driving member for providing the seat frame with a linear thrust along the length direction of the seat frame, one end of the first driving member is connected to the linkage mechanism or the seat frame, and the other end is connected to the chassis;

When the stretching device is in a zero-gravity sitting state, the first driving member is at the maximum stroke, the angle formed between the backrest assembly and the ground is not less than 150°, and the seat frame is raised and the ground is formed The angle is not less than 20°

By adopting the above technical solution, the seat frame and the backrest assembly can be rotated at a larger angle relative to the ground through a simple mechanism, so that the user can be completely in a zero gravity state when sitting on the sofa using the stretching device. Let people relax further.

A further arrangement of the present application is: the linkage mechanism includes a first connecting rod rotatably connected to the chassis and a second connecting rod rotatably connected to the first connecting rod, and one end of the first connecting rod away from the chassis is rotatably connected to the seat frame, the pivot point between the second connecting rod and the first connecting rod is located between the pivot point of the first connecting rod relative to the seat frame and the pivot point of the first connecting rod relative to the chassis, and the second connecting rod is far from One end of the first connecting rod is rotatably connected to the backrest assembly, and the connecting point of the second connecting rod and the backrest assembly is located between the pivoting point of the backrest assembly relative to the chassis and the pivoting point of the backrest assembly relative to the seat frame.

By adopting the above technical solution, the first connecting rod and the second connecting rod are used for transmission, so that when the seat frame is pushed along its length direction by the first driving member, the seat frame will rotate relative to the chassis so that one end of the seat frame is lifted and slightly moved toward the bottom frame. When the seat frame is moved forward and the seat frame is rotated at the same time, due to the limit and traction of the second connecting rod, the rotation of the backrest assembly relative to the seat frame causes the end of the backrest assembly away from the seat frame to fall backward, and the margin provided by the forward movement of the seat frame, The backrest assembly can be tilted backward to a larger angle, so that the angle formed between the backrest assembly and the ground is not less than 150°, and the angle formed between the raised seat frame and the ground is not less than 20°. The human body can be better in the state of zero gravity.

The present application is further provided as follows: the bottom frame is provided with a third connecting rod along the vertical direction, the backrest assembly includes a backrest support rod rotatably connected to the upper end of the third connecting rod, and the backrest support rod is close to one end of the seat frame The second connecting rod is rotatably connected to the seat frame, and the second connecting rod is rotatably connected to the backrest support rod.

By adopting the above technical solution, the backrest support rod is lifted to the required height through the third connecting rod, so that it has a larger space for tipping and rotation, and ensures that the tipping range of the backrest assembly during rotation is sufficient to achieve zero gravity state.

A further arrangement of the present application is that: the backrest assembly includes two backrest support rods symmetrically arranged along the length direction of the seat frame, and the linkage mechanism is provided with two and one linkage mechanism corresponds to one backrest support rod.

By adopting the above technical solution, both ends of the backrest assembly are stressed, so that the rotation adjustment of the seat frame and the backrest assembly is more stable, and the use comfort is improved.

A further arrangement of the present application is: the driving mechanism includes a second driving member for providing the leg support mechanism with a linear thrust along the length direction of the seat frame, and when the first driving member is at its maximum stroke, the second driving member moves from its smallest After the stroke reaches its maximum stroke, the leg support mechanism is raised at least 15cm.

By adopting the above technical solution, it is ensured that when the person is in a zero-gravity state, the leg support mechanism can support the human body's thigh as much as possible, so that the human body is more stable in a zero-gravity state, instead of the hip and A situation where the force of the thigh is separated occurs.

A further arrangement of the present application is: the seat frame includes a first dowel rod arranged along the width direction thereof, the first driving member is a driving cylinder, the first driving member is arranged along the length direction of the seat frame, and the first The two ends of the driving member are respectively rotatably connected to the first force transmission rod and the bottom frame.

By adopting the above technical solution, the first driving member can better transmit the force to the seat frame, so that the seat frame can stably reach a zero gravity state under the action of the first driving member.

A further arrangement of the present application is: when the second driving member is at its maximum stroke, after the first driving member reaches its maximum stroke from its minimum stroke, the leg support mechanism at least partially bends downward.

By adopting the above technical solution, when the user uses the sofa in a zero gravity state, the leg support mechanism can be partially bent downward, so that the lower leg can be bent relative to the thigh, preventing the leg from being stretched all the time. of cramps or discomfort, improving the comfort of use.

A further arrangement of the present application is as follows: a third transmission rod is fixed between the two second connecting rods, the first driving member is a driving cylinder, the first driving member is arranged along the length direction of the seat frame, and the first driving member is a driving cylinder. Both ends of a driving member are rotatably connected to the third transmission rod and the chassis; the second driving member is arranged along the length of the seat frame, and both ends of the second driving member are rotatably connected to the third transmission rod and the second transmission rod respectively. force rod.

By adopting the above technical solution, when the first driving member is elongated, the position of the third transmission rod will change, so that the leg link assembly is given force through the second driving member, so that the leg link assembly also has a certain degree of force. Movement, and then the leg link assembly is given a driving force through the second driving member itself, so that the leg link assembly achieves a partially bent state. Therefore, when the user uses the sofa in a zero-gravity state, the leg support mechanism can be partially bent downward, so that the calf can be bent relative to the thigh, so as to prevent cramps or discomfort caused by the legs being stretched all the time, and improve the performance of the sofa. the comfort of use.

A further arrangement of the present application is: the leg support mechanism includes two sets of leg link assemblies symmetrically arranged along the length direction of the seat frame, and a second force transmission for connecting the two leg link assemblies to make them move synchronously The second driving member is a driving cylinder, the second driving member is arranged along the length direction of the seat frame, and the two ends of the second driving member are respectively connected to the first power transmission rod and the second power transmission rod in rotation.

By adopting the above technical solution, the second driving member and the first driving member work separately, and the state of the leg support mechanism can be freely adjusted to be deployed to a desired position when the person is in a zero-gravity state. Therefore, the leg support mechanism has a good degree of freedom, which meets the needs of various people.

A further arrangement of the present application is: the leg link assembly includes a first leg rod rotatably connected to the seat frame, a second leg rod parallel to the first leg rod and rotatably connected to the seat frame, and rotatably connected to the first leg A third leg link connected to the second leg link and parallel to the third leg link, a fourth leg link connected to the second leg link and parallel to the third leg link, and a knee support block connected to the third leg link and the fourth leg link at the same time , Rotately connected to the middle rod of the fourth leg rod away from the second leg rod, and rotatably connected to the foot support rod of the knee support block, the middle rod is rotatably connected to the middle of the foot support rod, and the second force transmission The rod includes two power transmission seats and a connecting rod that is fixedly connected to the two force transmission seats, and the two ends of the force transmission base are respectively fixedly connected to the middle part of the first leg rod and the middle part of the second leg rod.

By adopting the above technical solution, the second driving member imparts a driving force along the length direction of the seat frame to the second power transmission rod, thereby driving the first leg rod and the second leg rod to rotate, so that the leg connecting assembly extends outward until It runs parallel to the seat frame and supports the legs well.

The present application has the following advantages: 1. The person is completely in a state of zero gravity, allowing people to further relax and rest; 2. The leg support mechanism can be partially bent downward, so that the lower leg can be bent relative to the thigh, Prevents cramps or discomfort caused by legs being stretched all the time, improving comfort.

Description of drawings

1 is a schematic structural diagram of a sitting posture state of Embodiment 1;

2 is a schematic structural diagram of Embodiment 1 when it is in a leisure state;

3 is a schematic structural diagram of Embodiment 1 in a zero-gravity state;

4 is a schematic structural diagram of Embodiment 1;

Fig. 5 is the enlarged view of A place in Fig. 4;

6 is a schematic structural diagram of Embodiment 2;

7 is a schematic structural diagram of Embodiment 2 when sitting in a posture state;

8 is a schematic structural diagram of Embodiment 2 when it is in a leisure state;

FIG. 9 is a schematic view of the structure of the embodiment 20 in a gravity state.

Reference numerals: 1, chassis; 2, backrest support rod; 3, seat frame; 4, leg support mechanism; 5, linkage mechanism; 6, drive mechanism; 7, third connecting rod; 8, first connecting rod ; 9, the second connecting rod; 10, the limit block; 11, the limit surface; 12, the first drive member; 13, the second drive member; 14, the first dowel rod; 15, the second dowel rod; 16, the first leg bar; 17, the second leg bar; 18, the third leg bar; 19, the fourth leg bar; 20, the knee support block; 21, the middle bar; 22, the foot support bar; 23, the pass force seat; 24, connecting rod; 25, the third dowel rod.

Detailed ways

Example 1:

As shown in FIG. 1 , a sofa stretching device that can provide a zero-gravity sitting feeling includes a base frame 1 , a backrest assembly, a seat frame 3 , a leg support mechanism 4 , a linkage mechanism 5 , and a drive mechanism 6 . The middle part of the backrest assembly is rotatably connected to the base frame 1, and the pivot 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. Both are connected to the base frame 1 through the linkage mechanism 5 in rotation.

In the normal sitting state of the sofa using the stretching device, the leg support mechanism 4 is folded and contracted under the seat frame 3, the angle formed between the backrest assembly and the ground is 113°, and the angle formed between the seat frame 3 and the ground is 9° , the angle formed between the seat frame 3 and the backrest assembly is 99°, so that the person is in a comfortable sitting position.

If the person needs to support the 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 the whole is parallel to the seat frame 3, so as to support the user 's legs.

When the 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 bottom frame 1 and moves slightly forward until the angle formed between it and the ground reaches 20°. At this time, due to the force transmission of the linkage mechanism 5, the backrest mechanism is rotated relative to the seat frame 3 and the bottom frame 1, so that the angle formed between the backrest assembly and the ground reaches 150°. Thereby, the person is placed in a zero-gravity state of lying back, making the user more comfortable. At this time, the leg support mechanism 4 is raised at least 15 cm.

As shown in FIG. 4 , specifically, the bottom frame 1 is a hollow frame formed by connecting rods. Both sides of the bottom frame 1 are provided with third connecting rods 7 along the vertical direction, and the third connecting rods 7 are used for connecting 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 rod 2 is rotatably connected to the upper end of the third connecting rod 7 , and the pivot point of the backrest support rod 2 and the third connecting rod 7 is located at the second turning point of the backrest support rod 2 from top to bottom. Therefore, the backrest assembly is stably installed on the base frame 1 through the third connecting rod 7 .

Two linkage mechanisms 5 are provided, 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 . One end of the first connecting rod 8 away from the base frame 1 is rotatably connected to the middle of the seat frame 3 . The second connecting rod 9 is Z-shaped. The pivot point between the second connecting rod 9 and the first connecting rod 8 is between the pivoting point of the first connecting rod 8 relative to the seat frame 3 and the pivoting point of the first connecting rod 8 relative to the chassis 1 . One 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 between the second connecting rod 9 and the backrest support rod 2 is located at the pivot point of the backrest support rod 2 relative to the chassis 1 and the backrest support rod 2 relative to the rotation point of the third connecting rod 7.

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 rod 2 to rotate synchronously, and the seat frame 3 can move forward slightly during the rotation process, so as to realize the release of the backrest support rod 2 position, so that the stretching device can better reach the zero gravity state.

As shown in FIG. 5 , in order to better keep the stretching device in a zero gravity state, a limiting block 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 a zero gravity sitting state, the limiting block 10 abuts the limiting surface 11 on the third connecting rod 7 .

As shown in FIG. 4 , the driving mechanism 6 includes a first driving member 12 for providing the seat frame 3 with a linear thrust along the length direction of the seat frame 3 and a straight line for providing the leg support mechanism 4 with a straight line along the length direction of the seat frame 3 The second drive 13 for thrust. The seat frame 3 includes a first force transmission rod 14 arranged along its width direction, the first driving member 12 is a driving cylinder, the first driving member 12 is arranged along the length direction of the seat frame 3, and the two ends of the first driving member 12 are respectively connected in rotation on the first dowel rod 14 and the base frame 1 .

As shown in FIG. 4 , the leg support mechanism 4 includes two sets of leg link assemblies symmetrically arranged along the length direction of the seat frame 3 , and a second force transmission rod for connecting the two leg link assemblies to move synchronously. 15. The second driving member 13 is a driving cylinder. The second driving member 13 is disposed along the length direction of the seat frame 3 , and the two ends of the second driving member 13 are rotatably connected to the first transmission rod 14 and the second transmission rod 15 respectively. The first driving member 12 and the second driving member 13 are located on the same vertical plane.

As shown in FIG. 4 , the leg link assembly includes a first leg rod 16 rotatably connected to the seat frame 3 , a second leg rod 17 parallel to the first leg rod 16 and rotatably connected to the seat frame 3 , and rotatably connected to the first leg rod 17 . A leg bar 16 and a third leg bar 18 of the second leg bar 17, a fourth leg bar 19 rotatably connected to the second leg bar 17 and parallel to the third leg bar 18, and simultaneously rotationally connected to the third leg bar 18 and The knee support block 20 of the fourth leg rod 19 , the middle rod 21 rotatably connected to the end of the fourth leg rod 19 away from the second leg rod 17 , and the foot support rod 22 rotatably connected to the knee support block 20 . The middle rod 21 is rotatably connected to the middle of the foot support rod 22 . The second power transmission rod 15 includes two power transmission bases 23 and a connecting rod 24 that is fixedly connected to the two power transmission bases 23. Both ends of the power transmission base 23 are fixedly connected to the middle of the first leg rod 16 and the middle of the second leg rod 17 respectively. .

The second driving member 13 imparts a driving force along the length direction of the seat frame 3 to the second dowel rod 15, thereby driving the first leg rod 16 and the second leg rod 17 to rotate, so that the leg connecting assembly extends outwards until the Parallel to the seat frame 3, it supports the legs very well.

The principles of this application are as follows:

Including three states, sitting state, leisure state and zero gravity state;

As shown in Figure 1, in the sitting position, the leg support mechanism 4 is folded and contracted under the seat frame 3, the angle formed between the backrest assembly and the ground is 113°, and the angle formed between the seat frame 3 and the ground is 9° , the angle formed between the seat frame 3 and the backrest assembly is 99°, so that the person is in a comfortable sitting position.

As shown in Figure 2, in the leisure state, that is, the upper body is half-lying and the lower body is supported, 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 seat The angle formed between the frame 3 and the backrest assembly is 99°. The leg support mechanism 4 extends outward until the entirety is parallel to the seat frame 3 so as to support the user's legs. Makes a person in a comfortable semi-recumbent state. You can read books and watch TV in this state.

As shown in Figure 3, in the zero gravity state, the angle formed between the backrest assembly and the ground is 150°, the angle formed between the seat frame 3 and the ground is 20°, and the angle formed between the seat frame 3 and the backrest assembly is 150°. The angle is 130°, and the leg support mechanism 4 extends outward until the entirety is parallel to the seat frame 3, thereby supporting the user's legs. Thus, the person is placed in a completely supine state of zero gravity for rest.

When the stretching device is switched between the sitting state and the resting state, the piston rod of the second driving member 13 is extended, and the second driving member 13 gives the second power transmission rod 15 an outward driving force along the length direction of the seat frame 3. The first The leg bar 16 and the second leg bar 17 are rotated, thereby driving the third leg bar 18 and the fourth leg bar 19 to rotate, and the knee support block 20 and the foot support bar 22 are spread out so as to be in a straight line with the seat frame 3. At this time, the entire leg support mechanism 4 is extended and opened outwards, so as to realize the support for the feet. When the piston rod of the second driving member 13 is shortened, the motion trajectory is opposite, and the leg support mechanism 4 is completely retracted and folded back under the seat frame 3 to complete the state transition.

When the stretching device is switched between the zero gravity state and the rest state, the piston rod of the first driving member 12 is extended to give the first force transmission rod 14 a driving force outward along the length direction of the seat frame 3, and the seat frame 3 is opposite to the bottom When the frame 1 rotates, it will move to the side away from the backrest assembly relative to the base frame 1. Driven by the linkage mechanism 5, the backrest assembly will rotate relative to the seat frame 3, thereby completing the forward tilt of the seat frame 3 and the backward tilt of the backrest assembly. Complete state transformation. When the piston rod of the second driving member 13 is shortened, the motion trajectory is opposite, the seat frame 3 is reset, and the backrest assembly is tilted forward, thereby returning to the resting state.

Embodiment 2:

The difference between the second embodiment and the first embodiment is that the first connecting rod 8 is not provided. As shown in FIG. 6 , a third transmission rod is fixed between the two second connecting rods 9 , the first driving member 12 is a driving cylinder, the first driving member 12 is arranged along the length direction of the seat frame 3 , and the first driving member Both ends of 12 are respectively connected to the third transmission rod and the bottom frame 1 in rotation. The second driving member 13 is disposed along the length direction of the seat frame 3 , and the two ends of the second driving member 13 are respectively connected to the third transmission rod 25 and the second transmission rod 15 in rotation. The knee support block 20, the middle rod 21 and the foot support rod 22 form a calf support.

When the first driving member 12 causes the position of the third transmission rod to change, the second driving member 13 gives force to the leg link assembly, so that the leg link assembly also has a certain degree of movement, and then passes through the first driving member 13. The two driving members 13 themselves give driving force to the leg link assembly, so that the leg link assembly achieves a partially bent state. Therefore, when the user uses the sofa in a zero gravity state, the calf support part in the leg support mechanism 4 is bent downward, so that the calf can be bent relative to the thigh, preventing cramps or cramps caused by the straight legs. Discomfort, improve the comfort of use.

The principles of this application are as follows:

Including three states, sitting state, leisure state and zero gravity state;

As shown in FIG. 7 , in the sitting position, the leg support mechanism 4 is folded and contracted under the seat frame 3 , the angle formed between the backrest assembly and the ground is 113°, and the angle formed between the seat frame 3 and the ground is 9° , the angle formed between the seat frame 3 and the backrest assembly is 99°, so that the person is in a comfortable sitting position.

As shown in Figure 8, in the leisure state, that is, the upper body is half-lying and the lower body is supported, 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 seat The angle formed between the frame 3 and the backrest assembly is 99°. The leg support mechanism 4 extends outward until the entirety is parallel to the seat frame 3 so as to support the user's legs. Makes a person in a comfortable semi-recumbent state. You can read books and watch TV in this state.

As shown in Figure 9, in the zero gravity state, the angle formed between the backrest assembly and the ground is 150°, the angle formed between the seat frame 3 and the ground is 20°, and the angle formed between the seat frame 3 and the backrest assembly is 20°. The angle is 130°, the leg support mechanism 4 is extended outward, and the calf support is bent downward, thereby supporting the user's legs. Thus, the person is placed in a completely supine state of zero gravity for rest.

When the stretching device is switched between the sitting state and the resting state, the piston rod of the second driving member 13 is extended, and the second driving member 13 gives the second power transmission rod 15 an outward driving force along the length direction of the seat frame 3. The first The leg bar 16 and the second leg bar 17 are rotated, thereby driving the third leg bar 18 and the fourth leg bar 19 to rotate, and the knee support block 20 and the foot support bar 22 are spread out so as to be in a straight line with the seat frame 3. At this time, the entire leg support mechanism 4 is extended and opened outwards, so as to realize the support for the feet. When the piston rod of the second driving member 13 is shortened, the motion trajectory is opposite, and the leg support mechanism 4 is completely retracted and folded back under the seat frame 3 to complete the state transition.

When the stretching device is switched between the zero gravity state and the rest state, the piston rod of the first driving member 12 is extended to give the first force transmission rod 14 a driving force outward along the length direction of the seat frame 3, and the seat frame 3 is opposite to the bottom When the frame 1 rotates, it will move to the side away from the backrest assembly relative to the base frame 1. Driven by the linkage mechanism 5, the backrest assembly will rotate relative to the seat frame 3, thereby completing the forward tilt of the seat frame 3 and the backward tilt of the backrest assembly. And the calf support part will bend down, and the complete state will be transformed. When the piston rod of the second driving member 13 is shortened, the motion trajectory is opposite, the seat frame 3 is reset, and the backrest assembly is tilted forward, thereby returning to the resting state.

The above are only the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments, and all technical solutions that belong to the idea of the present application belong to the protection scope of the present application. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present application should also be regarded as the protection scope of the present application.

Claims (10)

1. A sofa stretching device capable of providing a zero-gravity sitting feeling, 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), a drive Institution (6); The backrest assembly is rotatably connected to the chassis (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 with the backrest assembly, and the other end is rotatably connected with the leg support mechanism (4), and the seat frame (3) is rotatably connected to the chassis (1) through the linkage mechanism (5); The driving mechanism (6) includes a first driving member (12) for providing the seat frame (3) with a linear thrust along the length direction of the seat frame (3), and one end of the first driving member (12) is connected to the linkage mechanism (5) ) or the seat frame (3), and the other end is connected to the chassis (1); When the stretching device is in a zero-gravity sitting state, the first driving member (12) is at the maximum stroke, the angle formed between the backrest assembly and the ground is not less than 150°, and the seat frame (3) is lifted up. The angle formed between the height and the ground is not less than 20°. 2. A sofa stretching device capable of providing a zero-gravity sitting feeling according to claim 1, wherein the linkage mechanism (5) comprises a first connecting rod (8) rotatably connected to the bottom frame (1) and a second connecting rod (9) that is rotatably connected to the first connecting rod (8), the first connecting rod (8) is rotatably connected to the seat frame (3) at one end away from the chassis (1), and the second connecting rod (8) is rotatably connected to the seat frame (3). The pivot point between the rod (9) and the first connecting rod (8) is at the pivoting point of the first connecting rod (8) relative to the seat frame (3) and the pivoting point of the first connecting rod (8) relative to the chassis (1) Between points, the second connecting rod (9) is rotatably connected to the backrest assembly at one end away from the first connecting rod (8), and the connection point between the second connecting rod (9) and the backrest assembly is located at the backrest assembly relative to the chassis Between the pivot point of (1) and the pivot point of the backrest assembly relative to the seat frame (3). 3. A sofa stretching device capable of providing a zero-gravity sitting feeling according to claim 2, wherein a third connecting rod (7) is provided on the bottom frame (1) along the vertical direction, and the The backrest assembly includes a backrest support rod (2) rotatably connected to the upper end of the third connecting rod (7), and one end of the backrest support rod (2) close to the seat frame (3) is rotatably connected to the seat frame (3), the second The connecting rod (9) is rotatably connected to the backrest support rod (2). 4. A sofa stretching device capable of providing a zero-gravity sitting feeling according to claim 3, wherein the backrest assembly comprises two backrest support rods (2) symmetrically arranged along the length direction of the seat frame (3) , the linkage mechanism (5) is provided with two and one linkage mechanism (5) for one backrest support rod (2). 5. A sofa stretching device capable of providing a zero-gravity sitting feeling according to claim 4, wherein the driving mechanism (6) comprises a length along the seat frame (3) for the leg support mechanism (4) The second driving member (13) of the linear thrust in the direction, when the first driving member (12) is at its maximum stroke, after the second driving member (13) reaches its maximum stroke from its minimum stroke, the leg support mechanism (4) ) at least 15cm. 6 . The sofa stretching device capable of providing zero gravity sitting according to claim 5 , wherein the seat frame ( 3 ) comprises a first force transmission rod ( 14 ) arranged along its width direction, so the The first driving member (12) is a driving cylinder, the first driving member (12) is arranged along the length direction of the seat frame (3), and both ends of the first driving member (12) are respectively rotatably connected to the first dowel rod (14) and chassis (1). 7. A sofa stretching device capable of providing a zero-gravity sitting feeling according to claim 5, characterized in that: when the second driving member (13) is at its maximum stroke, the first driving member (12) moves from its smallest After the stroke has reached its maximum stroke, the leg support mechanism (4) is at least partially flexed downward. 8 . The sofa stretching device capable of providing zero-gravity sitting feeling according to claim 7 , wherein a third transmission rod is fixed between the two second connecting rods ( 9 ). A driving member (12) is a driving cylinder, the first driving member (12) is arranged along the length direction of the seat frame (3), and both ends of the first driving member (12) are rotatably connected to the third transmission rod and the base frame respectively (1); the second driving member (13) is arranged along the length direction of the seat frame (3), and the two ends of the second driving member (13) are rotatably connected to the third force transmission rod (25) and the second force transmission rod respectively rod (15). 9 . The sofa stretching device capable of providing a zero-gravity sitting feeling according to claim 5 , wherein the leg support mechanism ( 4 ) comprises two sets of symmetrically arranged along the length direction of the seat frame ( 3 ). 10 . A leg link (24) assembly, a second power transmission rod (15) for connecting the two leg link (24) assemblies to move synchronously, the second driving member (13) is a driving cylinder, so The second driving member (13) is arranged along the length direction of the seat frame (3), and the two ends of the second driving member (13) are respectively rotatably connected to the first power transmission rod (14) and the second power transmission rod (15). 10. The sofa stretching device capable of providing a zero-gravity sitting feeling according to claim 9, wherein the leg link (24) assembly comprises a first leg link rotatably connected to the seat frame (3). (16), a second leg bar (17) parallel to the first leg bar (16) and rotatably connected to the seat frame (3), and a second leg bar (17) rotatably connected to the first leg bar (16) and the second leg bar (17) A third leg bar (18), a fourth leg bar (19) rotatably connected to the second leg bar (17) and parallel to the third leg bar (18), and simultaneously rotationally connected to the third leg bar (18) and the third leg bar (18) The knee support block (20) of the four-leg bar (19), the middle bar (21) rotatably connected to the end of the fourth leg bar (19) away from the second leg bar (17), and the knee support block (20) rotatably connected ) of the foot support rod (22), the middle rod (21) is rotatably connected to the middle of the foot support rod (22), and the second power transmission rod (15) includes two power transmission seats (23) and a fixed The connecting rod (24) connecting the two power transmission seats (23), the two ends of the power transmission seat (23) are respectively fixedly connected to the middle part of the first leg rod (16) and the middle part of the second leg rod (17).

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