A sofa stretching device that can provide a zero-gravity sitting sensation

Abstract

The present application discloses a sofa stretching device capable of providing a zero-gravity sitting feeling, including a chassis, 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 chassis, and the rotation 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 to the backrest assembly, and the other end is rotatably connected to the leg support mechanism. The seat frame is rotatably connected to the chassis through a linkage mechanism; when the stretching device is in the zero-gravity sitting feeling state, the first driving member is at the maximum stroke, the angle formed between the reclined 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 are rotated at a larger angle relative to the ground, so that when a user sits on a sofa using this stretching device, they can be completely in a zero-gravity state, allowing people to further relax and rest.

Description

Technical Field

[0001] The present application relates to the field of furniture, and in particular to a sofa extension device capable of providing a zero-gravity sitting experience. Background Art

[0002] Sofas are currently used in all areas of people's lives, such as offices, living rooms, bedrooms, and outdoors. With the development of the economy, the types of furniture used by people in daily life are becoming more and more diverse, and people's requirements for the functions of furniture are becoming higher and higher. For example, liftable sofas, rotatable sofas, leisure sofa chairs suitable for the elderly, etc., are becoming more and more popular because of their diverse functions, convenience, comfort and health. The above different types of sofas can not only achieve the functions of traditional sofas, but also the above sofa types can be flexibly adjusted according to the user's needs to better meet the different needs of users.

[0003] The existing sofa frame cannot be completely in a zero-gravity state when lying down, that is, the seat frame is not tilted high enough, and the back support frame is not close enough to the ground, so people cannot further relax and rest.

[0004] Application Contents

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a sofa extension device that can provide a zero-gravity sitting experience, provide a zero-gravity state, and thus improve the comfort of use.

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

[0007] A sofa extension device capable of providing a zero-gravity sitting feeling comprises a base frame, a backrest assembly, a seat frame, a leg support mechanism, a linkage mechanism, and a driving mechanism;

[0008] 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;

[0009] 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;

[0010] The driving mechanism includes a first driving member for providing a linear thrust to the seat frame 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 base frame;

[0011] When the extension device is in a zero-gravity sitting state, the first driving member is at its maximum stroke, the angle formed between the backrest assembly lying back and the ground is not less than 150°, and the angle formed between the seat frame raised and the ground is not less than 20°

[0012] By adopting the above technical solution, a simple mechanism is used to achieve a larger-angle rotation of the seat frame and the backrest assembly relative to the ground, so that when the user sits on the sofa using this stretching device, they can be completely in a zero-gravity state, allowing people to further relax and rest.

[0013] A further setting of this application is that: the linkage mechanism includes a first connecting rod rotatably connected to the bottom frame and a second connecting rod rotatably connected to the first connecting rod. One end of the first connecting rod away from the bottom frame is rotatably connected to the seat frame. The rotation point between the second connecting rod and the first connecting rod is located between the rotation point of the first connecting rod relative to the seat frame and the rotation point of the first connecting rod relative to the bottom frame. One end of the second connecting rod away from the first connecting rod is rotatably connected to the backrest assembly, and the connection point of the second connecting rod and the backrest assembly is located between the rotation point of the backrest assembly relative to the bottom frame and the rotation point of the backrest assembly relative to the seat frame.

[0014] By adopting the above technical solution, through the transmission of the first connecting rod and the second connecting rod, when the seat frame is subjected to a thrust along its length direction by the first driving member, the seat frame will rotate relative to the bottom frame to lift one end and move slightly forward. At the same time, when the seat frame rotates, due to the limitation and traction of the second connecting rod, the backrest assembly rotates relative to the seat frame to make the end of the backrest assembly away from the seat frame tilt backward. And due to the margin provided by the forward movement of the seat frame, the backrest assembly can tilt backward to a larger angle, so as to achieve that the angle formed between the reclined backrest assembly and the ground is not less than 150°, and the angle formed between the lifted seat frame and the ground is not less than 20°. This enables the human body to better be in a zero-gravity state.

[0015] A further setting of this application is that: a third connecting rod is provided on the bottom frame in the vertical direction. The backrest assembly includes a backrest support rod rotatably connected to the upper end of the third connecting rod. One end of the backrest support rod close to the seat frame is rotatably connected to the seat frame. The second connecting rod is rotatably connected to the backrest support rod.

[0016] By adopting the above technical solution, the backrest support rod is lifted to the required height by the third connecting rod, so that it has a larger space amplitude for tilting and rotating, ensuring that the tilting amplitude of the backrest assembly during rotation is sufficient to achieve the zero-gravity state.

[0017] A further setting of this application is that: the backrest assembly includes two backrest support rods symmetrically arranged along the length direction of the seat frame, and there are two linkage mechanisms, and one linkage mechanism corresponds to one backrest support rod.

[0018] By adopting the above technical solution, both ends of the backrest assembly are stressed, making the rotational adjustment of the seat frame and the backrest assembly more stable and improving the use comfort.

[0019] A further setting of the present application is that the driving mechanism includes a second driving member for providing a linear thrust along the length direction of the seat frame to the leg support mechanism. When the first driving member is at its maximum stroke, after the second driving member reaches its maximum stroke from its minimum stroke, the leg support mechanism is raised by at least 15 cm.

[0020] By adopting the above technical solution, it is ensured that when a person is in a zero-gravity state, the leg support mechanism can support the thigh part of the human body as much as possible, so that the human body is more stable in the zero-gravity state, rather than the situation where the forces on the buttocks and thigh parts are separated.

[0021] A further setting of the present application is that the seat frame includes a first force transmission rod arranged along its width direction. The first driving member is a driving cylinder, which is arranged along the length direction of the seat frame, and both ends of the first driving member are rotatably connected to the first force transmission rod and the chassis respectively.

[0022] 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 the zero-gravity state under the action of the first driving member.

[0023] A further setting of the present application is that when the second driving member is at its maximum stroke, after the first driving member reaches its maximum stroke from its minimum stroke, at least part of the leg support mechanism bends downward.

[0024] By adopting the above technical solution, when the user uses the sofa in the zero-gravity state, part of the leg support mechanism can bend downward, so that the lower leg can bend relative to the thigh, preventing cramps or discomfort caused by the legs being straight all the time, and improving the use comfort.

[0025] A further setting of the present application is that a third transmission rod is fixedly arranged between the two second connecting rods. The first driving member is a driving cylinder, which is arranged along the length direction of the seat frame, and both ends of the first driving member are rotatably connected to the third transmission rod and the chassis respectively; the second driving member is arranged along the length direction of the seat frame, and both ends of the second driving member are rotatably connected to the third force transmission rod and the second force transmission rod respectively.

[0026] By adopting the above technical solution, when the first driving member extends, the position of the third transmission rod will change, thereby applying a force to the leg link assembly through the second driving member, so that the leg link assembly also moves to a certain extent, and then the second driving member itself gives a driving force to the leg link assembly, so that the leg connection assembly realizes a partially bent state. Thus, when the user uses the sofa in the zero-gravity state, part of the leg support mechanism can bend downward, so that the lower leg can bend relative to the thigh, preventing cramps or discomfort caused by the legs being straight all the time, and improving the use comfort.

[0027] A further setting of the present application is that: 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 rod for connecting the two leg link assemblies to make them move synchronously. The second driving member is a driving cylinder, which is arranged along the length direction of the seat frame, and both ends of the second driving member are rotatably connected to the first force transmission rod and the second force transmission rod respectively.

[0028] 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 the required position when the person is in a zero-gravity state. Thus, the leg support mechanism has better degrees of freedom and meets the needs of a variety of people.

[0029] A further setting of the present application is that: 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, a third leg rod rotatably connected to the first leg rod and the second leg rod, a fourth leg rod parallel to the third leg rod and rotatably connected to the second leg rod, a knee support block rotatably connected to both the third leg rod and the fourth leg rod, an intermediate rod rotatably connected to the end of the fourth leg rod away from the second leg rod, and a foot support rod rotatably connected to the knee support block. The intermediate rod is rotatably connected to the middle of the foot support rod. The second force transmission rod includes two force transmission seats and a connecting rod fixedly connecting the two force transmission seats. Both ends of the force transmission seat are fixedly connected to the middle of the first leg rod and the middle of the second leg rod respectively.

[0030] By adopting the above technical solution, the second driving member gives the second force transmission rod a driving force along the length direction of the seat frame, thereby driving the first leg rod and the second leg rod to rotate, so that the leg connection assembly extends outward until it is parallel to the seat frame, and well supports the legs.

[0031] The present application has the following advantages: 1. It enables people to be completely in a zero-gravity state, allowing people to further relax and rest; 2. The leg support mechanism can be partially bent downward, enabling the lower leg to be bent relative to the thigh, preventing cramps or discomfort caused by the legs being always straight, and improving the use comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram in the sitting posture state of Embodiment 1;

[0033] Figure 2 It is a schematic structural diagram in the leisure state of Embodiment 1;

[0034] Figure 3 It is a schematic structural diagram in the zero-gravity state of Embodiment 1;

[0035] Figure 4 It is a schematic structural diagram of Embodiment 1;

[0036] Figure 5 For Figure 4 The enlarged view at position A in the middle;

[0037] Figure 6 It is the structural schematic diagram of the second embodiment;

[0038] Figure 7 It is the structural schematic diagram of the second embodiment in the sitting posture state;

[0039] Figure 8 It is the structural schematic diagram of the second embodiment in the leisure state;

[0040] Figure 9 It is the structural schematic diagram of the second embodiment in the zero - gravity state.

[0041] 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, second connecting rod; 10, limit block; 11, limiting surface; 12, first driving member; 13, second driving member; 14, first force - transmitting rod; 15, second force - transmitting rod; 16, first leg rod; 17, second leg rod; 18, third leg rod; 19, fourth leg rod; 20, knee support block; 21, intermediate rod; 22, foot support rod; 23, force - transmitting seat; 24, connecting rod; 25, third force - transmitting rod. Detailed implementation manners

[0042] Embodiment 1:

[0043] As Figure 1 shown, a sofa stretching device capable of providing a zero - gravity sitting feeling includes a chassis 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 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 to the backrest assembly, and the other end is rotatably connected to the leg support mechanism 4. The seat frame 3 is rotatably connected to the chassis 1 through the linkage mechanism 5.

[0044] In the normal sitting state of the sofa using this 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°, 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°, so that people are in a comfortable sitting posture state.

[0045] If a person needs to support the legs, the drive mechanism 6 gives a driving force to the leg support mechanism 4 along the length direction of the seat frame 3, so that the leg support mechanism 4 extends outwards until it is parallel to the seat frame 3 as a whole, thereby supporting the legs of the user.

[0046] When a person needs to lie on their back, the driving mechanism 6 applies a driving force to the seat frame 3 in its length direction, causing the seat frame 3 to rotate relative to the chassis 1 and move 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 rotates relative to the seat frame 3 and the chassis 1, so that the angle formed between the backrest assembly and the ground reaches 150°. Thus, the person is in a reclined zero-gravity state, making the user more comfortable. At this time, the leg support mechanism 4 is raised by at least 15 cm.

[0047] As Figure 4 shown, specifically, the chassis 1 is a U-shaped frame formed by connecting rod bodies. On both sides of the chassis 1, third connecting rods 7 are provided along the vertical direction, and 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.

[0048] 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.

[0049] At this time, applying a force to the seat frame 3 in its length direction 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 make way for the backrest support rods 2, so that the stretching device can better reach the zero-gravity state.

[0050] As Figure 5 shown, in order to make the stretching device better maintain the 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 the zero-gravity sitting feeling state, the limiting block 10 abuts against the limiting surface 11 on the third connecting rod 7.

[0051] As Figure 4As shown in the figure, the driving mechanism 6 includes a first driving member 12 for providing a linear thrust to the seat frame 3 in the length direction of the seat frame 3 and a second driving member 13 for providing a linear thrust to the leg support mechanism 4 in the length direction of the seat frame 3. The seat frame 3 includes a first force transmission rod 14 disposed along its width direction. The first driving member 12 is a driving cylinder. The first driving member 12 is disposed along the length direction of the seat frame 3, and both ends of the first driving member 12 are rotatably connected to the first force transmission rod 14 and the chassis 1 respectively.

[0052] As Figure 4 shown in the figure, the leg support mechanism 4 includes two sets of leg link assemblies symmetrically disposed along the length direction of the seat frame 3 and a second force transmission rod 15 for connecting the two leg link assemblies to make them move synchronously. 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 both ends of the second driving member 13 are rotatably connected to the first force transmission rod 14 and the second force transmission rod 15 respectively. The first driving member 12 and the second driving member 13 are located in the same vertical plane.

[0053] As Figure 4 shown in the figure, 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, a third leg rod 18 rotatably connected to the first leg rod 16 and the second leg rod 17, a fourth leg rod 19 rotatably connected to the second leg rod 17 and parallel to the third leg rod 18, a knee support block 20 rotatably connected to both the third leg rod 18 and the fourth leg rod 19, an intermediate rod 21 rotatably connected to the end of the fourth leg rod 19 away from the second leg rod 17, and a foot support rod 22 rotatably connected to the knee support block 20. The intermediate rod 21 is rotatably connected to the middle of the foot support rod 22. The second force transmission rod 15 includes two force transmission seats 23 and a connecting rod 24 fixedly connecting the two force transmission seats 23. Both ends of the force transmission seat 23 are fixedly connected to the middle parts of the first leg rod 16 and the second leg rod 17 respectively.

[0054] The second driving member 13 gives the second force transmission rod 15 a driving force along the length direction of the seat frame 3, thereby driving the first leg rod 16 and the second leg rod 17 to rotate, so that the leg connection assembly extends outwards until it is parallel to the seat frame 3, providing good support for the legs.

[0055] The principle of this application is as follows:

[0056] It includes three states: sitting state, leisure state and zero gravity state;

[0057] As Figure 1 shown in the figure, in the sitting state, 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°, 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°, so that people are in a comfortable sitting state.

[0058] As Figure 2 shown, in the leisure state, that is, the upper body is semi - reclined 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 angle formed between the seat frame 3 and the backrest assembly is 99°. The leg support mechanism 4 extends outwards until it is entirely parallel to the seat frame 3, thereby supporting the user's legs. This enables the user to be in a comfortable semi - reclined state. Reading, watching TV, etc. can be carried out in this state.

[0059] As Figure 3 shown, 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 130°. The leg support mechanism 4 extends outwards until it is entirely parallel to the seat frame 3, thereby supporting the user's legs. This enables the user to be in a completely reclined zero - gravity state for rest and relaxation.

[0060] When the stretching device switches between the sitting state and the leisure state, the piston rod of the second driving member 13 elongates. The second driving member 13 gives the second force - transmitting rod 15 a driving force outwards along the length direction of the seat frame 3. 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. The knee support block 20 and the foot support rod 22 unfold outwards until they are in a straight line with the seat frame 3. At this time, the entire leg support mechanism 4 is extended and opened outwards to achieve the support for the feet. When the piston rod of the second driving member 13 shortens, the movement trajectory is opposite, and the entire leg support mechanism 4 contracts and folds back under the seat frame 3 to complete the state conversion.

[0061] When the stretching device switches between the zero - gravity state and the leisure state, the piston rod of the first driving member 12 elongates, giving the first force - transmitting rod 14 a driving force outwards along the length direction of the seat frame 3. The seat frame 3 rotates relative to the chassis 1 and at the same time moves away from the backrest assembly relative to the chassis 1. Driven by the linkage mechanism 5, the backrest assembly rotates 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 conversion of the complete state. When the piston rod of the second driving member 13 shortens, the movement trajectory is opposite, the seat frame 3 resets, and the backrest assembly tilts forward to return to the leisure state.

[0062] Embodiment 2:

[0063] The difference between Embodiment 2 and Embodiment 1 is that the first connecting rod 8 is not provided. As Figure 6As shown, a third transmission rod is fixedly arranged between 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 both ends of the first driving member 12 are respectively rotatably connected to the third transmission rod and the chassis 1. The second driving member 13 is arranged along the length direction of the seat frame 3, and both ends of the second driving member 13 are respectively rotatably connected to the third force transmission rod 25 and the second force transmission rod 15. The knee support block 20, the middle rod 21 and the foot support rod 22 form a calf support part.

[0064] When the first driving member 12 operates, it will cause a change in the position of the third transmission rod, thereby applying force to the leg link assembly through the second driving member 13, enabling the leg link assembly to move to a certain extent. Then, the second driving member 13 itself applies a driving force to the leg link assembly, causing the leg connection assembly to achieve a partially bent state. Thus, when the user is in the zero-gravity state while using this sofa, the calf support part in the leg support mechanism 4 bends downward, allowing the calf to bend relative to the thigh, preventing cramps or discomfort caused by the legs being constantly straightened and improving the use comfort.

[0065] The principle of this application is as follows:

[0066] It includes three states: sitting state, leisure state, and zero-gravity state;

[0067] As Figure 7 shown, in the 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°, thus enabling a person to be in a comfortable sitting state.

[0068] As Figure 8 shown, in the leisure state, that is, the state where the upper body is semi-reclined 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 angle formed 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, thereby being able to support the user's legs and enabling a person to be in a comfortable semi-reclined state. Reading, watching TV, etc. can be carried out in this state.

[0069] As Figure 9 shown, 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 130°. The leg support mechanism 4 extends outward and the calf support part bends downward, thereby supporting the user's legs. Thus, a person is in a completely reclined zero-gravity state for rest and relaxation.

[0070] When the stretching device switches between the sitting state and the leisure state, the piston rod of the second driving member 13 extends, and the second driving member 13 gives the second force transmission rod 15 a driving force outward along the length direction of the seat frame 3. 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. The knee support block 20 and the foot support rod 22 unfold outward to be in a straight line with the seat frame 3. At this time, the entire leg support mechanism 4 is extended and opened outward to achieve the support for the feet. When the piston rod of the second driving member 13 shortens, the movement track is opposite, and the entire leg support mechanism 4 contracts and folds back under the seat frame 3 to complete the state conversion.

[0071] When the stretching device switches between the zero-gravity state and the leisure state, the piston rod of the first driving member 12 extends, giving the first force transmission rod 14 a driving force outward along the length direction of the seat frame 3. The seat frame 3 rotates relative to the underframe 1 and at the same time moves away from the backrest assembly side relative to the underframe 1. Driven by the linkage mechanism 5, the backrest assembly rotates 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 bends downward to complete the state conversion. When the piston rod of the second driving member 13 shortens, the movement track is opposite, the seat frame 3 resets, and the backrest assembly tilts forward to return to the leisure state.

[0072] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above embodiments. All technical solutions within the idea of the present application belong to the protection scope of the present application. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present application should also be regarded as the protection scope of the present application.

Claims

1. A sofa stretching device capable of providing a zero-gravity sitting feeling, characterized in that: It includes a chassis (1), a backrest assembly, a seat frame (3), a leg support mechanism (4), a linkage mechanism (5), and a drive mechanism (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 to the backrest assembly, and the other end is rotatably connected to the leg support mechanism (4). The seat frame (3) is rotatably connected to the chassis (1) through the linkage mechanism (5); The linkage mechanism (5) includes a first connecting rod (8) rotatably connected to the chassis (1) and a second connecting rod (9) rotatably connected to the first connecting rod (8). The end of the first connecting rod (8) far from the chassis (1) is rotatably connected to the seat frame (3). 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) far from the first connecting rod (8) is rotatably connected to the backrest assembly, and the connection point of the second connecting rod (9) and the backrest assembly is located between the rotation point of the backrest assembly relative to the chassis (1) and the rotation point of the backrest assembly relative to the seat frame (3); The drive mechanism (6) includes a first driving member (12) for providing a linear thrust along the length direction of the seat frame (3). 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 first driving member (12) applies a thrust along the length direction of the seat frame (3), the seat frame (3) rotates relative to the chassis (1). One end of the seat frame (3) is lifted and moves forward. The second connecting rod (9) limits and pulls the backrest assembly, so that the backrest assembly rotates relative to the seat frame (3). The end of the backrest assembly far from the seat frame (3) tilts backward. The forward movement of the seat frame (3) provides space for the backward tilt of the backrest assembly, so that the backrest assembly can form an angle of not less than 150° with the ground; When the stretching device is in the zero-gravity sitting feeling state, the first driving member (12) is at the maximum stroke. The angle formed between the reclined backrest assembly and the ground is not less than 150°, and the angle formed between the lifted seat frame (3) and the ground is not less than 20°; 2. The sofa stretching device capable of providing zero-gravity sitting feeling according to claim 1, characterized in that: A third connecting rod (7) is provided on the chassis (1) in the vertical direction. The backrest assembly includes a backrest support rod (2) rotatably connected to the upper end of the third connecting rod (7). The end of the backrest support rod (2) close to the seat frame (3) is rotatably connected to the seat frame (3). The second connecting rod (9) is rotatably connected to the backrest support rod (2); 3. The sofa stretching device capable of providing zero-gravity sitting feeling according to claim 2 is characterized in that: The backrest assembly includes two backrest support rods (2) symmetrically arranged along the length direction of the seat frame (3). There are two linkage mechanisms (5), and one linkage mechanism (5) corresponds to one backrest support rod (2); 4. A sofa stretching device capable of providing a zero-gravity sitting feeling according to claim 3, characterized in that: The driving mechanism (6) includes a second driving member (13) for providing a linear thrust to the leg support mechanism (4) in the length direction of the seat frame (3). 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) is lifted by at least 15 cm.

5. The sofa stretching device capable of providing zero-gravity sitting feeling according to claim 4, wherein: 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 both ends of the first driving member (12) are respectively rotatably connected to the first force transmission rod (14) and the chassis (1).

6. The sofa stretching device capable of providing zero-gravity sitting feeling according to claim 4, characterized in that: When the second driving member (13) is at its maximum stroke, after the first driving member (12) reaches its maximum stroke from its minimum stroke, the leg support mechanism (4) bends downward at least partially.

7. A sofa stretching device capable of providing a zero-gravity sitting feeling according to claim 6, characterized in that: A third transmission rod is fixedly arranged 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 both ends of the first driving member (12) are respectively rotatably connected to the third transmission rod and the chassis (1); the second driving member (13) is arranged along the length direction of the seat frame (3), and both ends of the second driving member (13) are respectively rotatably connected to the third force transmission rod (25) and the second force transmission rod (15).

8. A sofa stretching device capable of providing a zero-gravity sitting feeling according to claim 4, characterized in that: The leg support mechanism (4) includes two sets of leg link (24) assemblies symmetrically arranged along the length direction of the seat frame (3) and a second force transmission rod (15) for connecting the two leg link (24) assemblies to make them move synchronously. The second driving member (13) is a driving cylinder. The second driving member (13) is arranged along the length direction of the seat frame (3), and both ends of the second driving member (13) are respectively rotatably connected to the first force transmission rod (14) and the second force transmission rod (15).

9. A sofa stretching device capable of providing a zero-gravity sitting feeling according to claim 8, characterized in that: The leg link (24) 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), a third leg rod (18) rotatably connected to the first leg rod (16) and the second leg rod (17), a fourth leg rod (19) rotatably connected to the second leg rod (17) and parallel to the third leg rod (18), a knee support block (20) simultaneously rotatably connected to the third leg rod (18) and the fourth leg rod (19), an intermediate rod (21) rotatably connected to the end of the fourth leg rod (19) away from the second leg rod (17), and a foot support rod (22) rotatably connected to the knee support block (20). The intermediate rod (21) is rotatably connected to the middle of the foot support rod (22). The second force transmission rod (15) includes two force transmission seats (23) and a connecting rod (24) fixedly connecting the two force transmission seats (23). Both ends of the force transmission seat (23) are respectively fixedly connected to the middle of the first leg rod (16) and the middle of the second leg rod (17).

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