A sofa extension device with improved user experience

Abstract

The present application relates to a sofa extension device with improved user experience, including a base, a seat frame rotatably connected to the base, a backrest assembly installed at one end of the seat frame, a leg support assembly installed at the other end of the seat frame, a driving assembly for driving the posture change of the extension device, and a limiter installed between the seat frame and the leg support assembly. When the extension device changes from a sitting position to a TV position and then to a lying position, the leg support assembly is unfolded to the extreme position, and the limiter locks the leg support assembly to the seat frame; when the extension device changes from a lying position to a TV position and then to a sitting position, the seat frame rotates to the extreme position relative to the base, and the limiter unlocks the leg support assembly. This avoids the situation where the leg support assembly is folded first when the extension device changes from a lying position to a TV position, and avoids the disordered order of retracting various parts of the extension device, which affects the body feeling.

Description

Technical Field

[0001] The present application relates to the field of smart furniture, and in particular to a sofa extension device that improves user experience. Background Art

[0002] In order to meet people's different usage needs, the current multifunctional sofas generally have three states: sitting position, TV position and lying position. When adjusting the posture, if you need to change from TV position to lying position, the seat frame will rotate relative to the base, and the leg support assembly will rotate and unfold relative to the seat frame synchronously, thereby realizing the posture change. However, when changing from lying position to TV position, since the leg support assembly and the seat frame move at the same time, users often feel that the leg support assembly retracts first, resulting in a poor user experience. Summary of the invention

[0003] In order to improve the user experience,

[0004] The present application provides a sofa extension device with improved user experience, which adopts the following technical solution:

[0005] A sofa stretching device with improved user experience comprises a base, a seat frame rotatably connected to the base, a backrest assembly installed at one end of the seat frame, a leg support assembly installed at the other end of the seat frame, a driving assembly for driving the stretching device to change its posture, and a limiter installed between the seat frame and the leg support assembly. When the stretching device changes from a sitting position to a TV position and then to a lying position, the leg support assembly is unfolded to an extreme position, and the limiter locks the leg support assembly to the seat frame; when the stretching device changes from a lying position to a TV position and then to a sitting position, the seat frame rotates to an extreme position relative to the base, and the limiter unlocks the leg support assembly.

[0006] By adopting the above technical solution, after the stretching device changes from a sitting position to a TV position, the leg support assembly is locked with the seat frame, so the leg support assembly is still locked with the seat frame in a lying position, and the leg support assembly cannot be unfolded or folded. When the stretching device changes from a lying position to a TV position, the leg support assembly can only be unlocked and folded after the seat frame moves to a certain angle. This avoids the situation where the leg support assembly is folded first when the stretching device changes from a lying position to a TV position, and avoids the disordered order of the various parts of the stretching device being retracted, which affects the body sensation.

[0007] Optionally, the seat frame is provided with a connecting seat rotatably connected to the base, a seat frame linkage rod is provided between the connecting seat and the seat frame, one end of the seat frame linkage rod is slidably connected to the seat frame and the other end is rotatably connected to the connecting seat, and the limit member is installed on the seat frame linkage rod and connected to one end of the seat frame; when the extension device is changed from a sitting position to a TV position, the limit member slides forward relative to the seat frame as the leg support assembly is extended, until the leg support assembly moves to the limit position and the limit member slides to the limit position and cannot continue to slide forward; when the extension device is changed from a TV position to a lying position, the limit member moves with the seat frame to a state of being pressed against the leg support assembly, so that the leg support assembly cannot be folded.

[0008] By adopting the above technical solution, when the front end of the seat frame is in an upward tilted state, the leg support assembly is definitely in an unfolded state, and the limiting member is in contact with the leg support assembly, so that the leg support assembly cannot be folded, thereby playing a better role in preventing operation disorder.

[0009] Optionally, the leg support assembly is installed on the inner side of the seat frame, the seat frame linkage rod is installed on the outer side of the seat frame, a slide groove is provided on the seat frame, and the limiting member passes through the slide groove and is slidably connected in the slide groove.

[0010] By adopting the above technical solution, the overall width of the leg support assembly is made smaller than the overall width of the seat frame, so that the overall structure is more compact and stable.

[0011] Optionally, the leg support assembly includes a leg connecting rod group, a foot supporting seat and a foot supporting rod, the leg connecting rod group is connected to one end of the seat frame and is connected to the driving assembly, the foot supporting seat is connected to the end of the leg connecting rod group away from the seat frame, and the foot supporting rod is rotatably connected to the foot supporting seat; when the leg connecting rod group is unfolded, the foot supporting rod is rotated and unfolded relative to the foot supporting seat.

[0012] By adopting the above technical solution, the folding and unfolding of the leg support assembly can be achieved, with a simple structure and smooth operation.

[0013] Optionally, the leg connecting rod assembly includes a first leg rod rotatably connected to the seat frame, the first leg rod forming a limiting plane toward the side of the limiting member; when the stretching device changes from a TV position to a lying position, the limiting member moves to a position abutting against the limiting plane.

[0014] By adopting the above technical solution, the limiting member and the limiting plane cooperate with each other, so that the limiting member can limit the leg support assembly more stably.

[0015] Optionally, the limiting member is cylindrical and is rotatably connected to the seat frame linkage rod.

[0016] By adopting the above technical solution, the resistance received by the limiting member when sliding relative to the limiting plane is smaller, so that the limiting member can slide more smoothly relative to the seat frame and the first leg rod.

[0017] Optionally, a first elastic member is provided between the base and the first leg rod, and the first elastic member is used to pull the first leg rod inward so that the limiting plane on the first leg rod is stably abutted against the limiting member.

[0018] By adopting the above technical solution, the first elastic member exerts a pulling force on the first leg rod, so that when the sitting position is opened to the TV position, the leg support assembly is opened first, thereby avoiding the disorder of the order caused by the seat frame being pushed forward first, which affects the body feeling. When in the lying position, the first elastic member exerts a pulling force on the first leg rod, so that the leg support assembly is in a fully opened state in the lying position.

[0019] Optionally, the backrest assembly includes a backrest rod rotatably connected to the base, and a second elastic member is provided between the backrest rod and the base for keeping the backrest rod in a sitting state.

[0020] By adopting the above technical solution, the second elastic member exerts a pulling force on the backrest assembly, so that when the backrest assembly is retracted from the lying position to the TV position, the seat frame is retracted first, thereby preventing the limiting member from being subjected to excessive force and causing abnormalities.

[0021] Optionally, the leg linkage assembly further includes a second leg rod, which is rotatably connected to the seat frame and is located outside the first leg rod, and the drive assembly is connected to the second leg rod.

[0022] By adopting the above technical solution, the driving assembly will not interfere with the limiting member, and at the same time can stably drive the leg support assembly to expand and fold.

[0023] Optionally, the leg linkage group also includes a third leg rod and a fourth leg rod parallel to each other, one end of the third leg rod is rotatably connected to the first leg rod and the other end is rotatably connected and slidably connected to the foot support seat, one end of the fourth leg rod is rotatably connected to the second leg rod and the other end is rotatably connected to the foot support seat, a first guide assembly is provided between the third leg rod and the fourth leg rod, and when the second leg rod rotates, the first guide assembly causes the third leg rod and the fourth leg rod to rotate synchronously and slide relative to each other along their length directions.

[0024] By adopting the above technical solution, the leg support assembly can be smoothly unfolded and folded, and at the same time, there will be no safety hazard of pinching hands due to the relative rotation between the third leg rod and the fourth leg rod.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. Simple structure, small size and smooth operation;

[0027] 2. With an anti-operation disorder structure, the leg support components will not be folded first when changing from lying position to TV position, which provides a better user experience;

[0028] 3. Small safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the embodiment when lying down.

[0030] Figure 2 It is a right side view of the embodiment in a sitting position.

[0031] Figure 3 It is a right side view of the embodiment in TV posture.

[0032] Figure 4 It is a right side view of the embodiment in a lying position.

[0033] Figure 5 It is a left side view of the embodiment in a lying position.

[0034] Description of the accompanying drawings: 1, base; 2, seat frame; 3, backrest assembly; 4, leg support assembly; 5, drive assembly; 6, armrest mounting plate; 7, backrest mounting plate; 8, connecting reinforcement rod; 9, connecting seat; 10, first guide groove; 11, first guide shaft; 12, first limiting nail; 13, backrest rod; 14, second limiting nail; 15, foot support seat; 16, foot support rod; 17, first leg rod; 18, second leg rod; 19 , the third leg rod; 20, the fourth leg rod; 21, the second guide groove; 22, the second guide shaft; 23, the limit plate; 24, the third limit nail; 25, the force transmission rod; 26, the electric cylinder; 27, the seat frame linkage rod; 28, the slide groove; 29, the limit member; 30, the limit plane; 31, the first elastic member; 32, the second elastic member; 33, the foot linkage rod; 34, the extension rod; 35, the third guide shaft; 36, the third guide groove; 37, the reinforcement plate. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-5 This application is described in further detail.

[0036] The present application embodiment discloses a sofa extension device with improved user experience. Figure 1 A sofa extension device with improved user experience includes a base 1, a seat frame 2 rotatably connected to the base 1, two backrest components 3 respectively installed on both sides of one end of the seat frame 2, two leg support components 4 respectively installed on both sides of the other end of the seat frame 2, and a driving component 5 for driving the extension device to change its posture. The end of the seat frame 2 close to the leg support component 4 is set as the front end, and the end of the seat frame 2 close to the backrest component 3 is set as the rear end.

[0037] Reference Figure 2 When the extension device is in a sitting position, the seat frame 2 and the backrest assembly 3 are both in an initial state, and the leg support assembly 4 is in a state of being folded at one end of the seat frame 2. Figure 3 When the extension device is in the TV state, the seat frame 2 and the backrest assembly 3 are both in the initial state, and the leg support assembly 4 is in a state of being fully extended at one end of the seat frame 2. Figure 4 When the extension device is in a lying state, the seat frame 2 is tilted toward the front and the front end of the seat frame 2 is tilted upward, the backrest assembly 3 rotates outward relative to the seat frame 2, and the leg support assembly 4 is still in a state of being fully extended at one end of the seat frame 2.

[0038] Specifically, refer to Figure 1 The base 1 includes two armrest mounting plates 6, two backrest mounting plates 7 and a connecting reinforcing rod 8. The two armrest mounting plates 6 are symmetrically arranged and located on both sides of the seat frame 2. One backrest mounting plate 7 corresponds to one armrest mounting plate 6, and the backrest mounting plate 7 is fixedly mounted on the rear end of the corresponding armrest mounting seat. The two ends of the connecting reinforcing rod 8 are respectively fixedly connected to the lower ends of the two backrest mounting plates 7. In order to enhance the structural strength, a reinforcing plate 37 is provided between the armrest mounting plate 6 and the backrest mounting plate 7, and the two ends of the reinforcing plate 37 are respectively fixedly connected to the armrest mounting plate 6 and the backrest mounting plate 7.

[0039] Reference Figure 1 , both sides of the seat frame 2 are equipped with connecting seats 9. One end of the connecting seat 9 is rotatably connected to the seat frame 2 and the other end is rotatably connected to the corresponding armrest mounting plate 6, so that the seat frame 2 is rotatably connected to the base 1. Figure 1 and Figure 4 In order to make the connection seat 9 rotate more stably relative to the seat frame 2, a first guide groove 10 is provided on the connection seat 9, and a first guide shaft 11 is slidably connected in the first guide groove 10. The first guide shaft 11 is fixedly connected to the armrest mounting plate 6. When the connection seat 9 rotates relative to the seat frame 2, the first guide shaft 11 slides in the first guide groove 10, playing a certain guiding and supporting role. Figure 2 A first limiting nail 12 is provided on the connecting seat 9. When the extending device is rotated to the sitting position or the TV position, the first limiting nail 12 abuts against the lower end surface of the seat frame 2 to prevent the seat frame 2 from continuing to rotate downward.

[0040] Reference Figure 1 The backrest assembly 3 includes a backrest rod 13, the lower end of the backrest rod 13 is rotatably connected to the rear end of the seat frame 2, and the middle part of the backrest rod 13 is rotatably connected to the upper end of the backrest mounting plate 7. When the seat frame 2 moves relative to the base 1, the backrest rod 13 is driven to rotate relative to the seat frame 2 to achieve the posture adjustment requirements. Figure 5 A second limiting nail 14 is fixedly arranged on the backrest rod 13. When the stretching device is rotated to the lying state, the second limiting nail 14 abuts against the backrest mounting plate 7 to prevent the backrest rod 13 from further turning downward.

[0041] Reference Figure 1 The leg support assembly 4 includes a leg connecting rod group, a foot supporting seat 15 and a foot supporting rod 16. The leg connecting rod group is unfolded and folded, which drives the foot supporting seat 15 and the foot supporting rod 16 to unfold and fold, thereby realizing the unfolding and folding of the entire leg support assembly 4.

[0042] Specifically, refer to Figure 1 The leg connecting rod group includes a first leg rod 17, a second leg rod 18, a third leg rod 19, and a fourth leg rod 20. One end of the first leg rod 17 is rotatably connected to the seat frame 2, and the other end is rotatably connected to one end of the third leg rod 19. One end of the second leg rod 18 is rotatably connected to the front end of the seat frame 2 and is located in front of the first leg rod 17.

[0043] Reference Figure 3 , the third leg rod 19 is rotatably connected to the foot support seat 15 at one end away from the first leg rod 17 and is slidably connected to the foot support seat 15. An extension rod 34 is extended on the fourth leg rod 20 along the length direction of the second leg rod 18. A second guide groove 21 is provided on the extension rod 34 along its length direction, and a second guide shaft 22 is provided on the second leg rod 18. The second guide shaft 22 is slidably connected to the second guide groove 21 and is rotatably connected to the second guide groove 21. The second leg rod 18 is rotatably connected to the fourth leg rod 20 through the second guide shaft 22. A guide assembly is provided between the third leg rod 19 and the fourth leg rod 20. A third guide groove 36 is provided on the fourth leg rod 20, and two third guide grooves 36 are provided along the length direction of the fourth leg rod 20, and each third guide groove 36 corresponds to a guide assembly. The guide assembly includes a third guide shaft 35 installed on the third leg rod 19, and the third guide shaft 35 passes through the third guide groove 36 and is slidably connected to the third guide groove 36. A limit plate 23 is installed on the third guide shaft 35, and the fourth leg rod 20 is located between the limit plate 23 and the third leg rod 19. One end of the foot support rod 16 is rotatably connected to the foot support seat 15, and a foot linkage rod 33 is provided between the foot support rod 16 and the fourth leg rod 20, and both ends of the foot linkage rod 33 are rotatably connected to the foot support rod 16 and the fourth leg rod 20 respectively.

[0044] The process of the leg support assembly 4 changing from folding to unfolding is as follows: the second leg rod 18 rotates relative to the seat frame 2, and then drives the first leg rod 17 to rotate relative to the seat frame 2, so that the leg connecting rod group unfolds outward. At this time, the third leg rod 19 and the fourth leg rod 20 move relatively along the length direction of the second guide groove 21, thereby driving the foot support seat 15 to rotate and unfold; at the same time, under the action of the foot linkage rod 33, the foot support rod 16 also rotates and unfolds relative to the foot support seat 15, thereby realizing the overall unfolding of the leg support assembly 4. At this time, since there is no gap change between the third leg rod 19 and the fourth leg rod 20 as they rotate, the safety hazard of pinching hands is reduced.

[0045] Reference Figure 5 A third limiting nail 24 is disposed on the second leg rod 18. When the extension device is rotated to the lying state, the third limiting nail 24 abuts against the lower end surface of the seat frame 2 to prevent the leg support assembly 4 from continuing to expand outward.

[0046] Reference Figure 1 The driving assembly 5 includes an electric cylinder 26 and a force transmission rod 25. The two ends of the force transmission rod 25 are respectively fixedly mounted on the two second leg rods 18. One end of the electric cylinder 26 is fixedly mounted on the connecting reinforcing rod 8, and the other end is fixedly mounted on the middle of the force transmission rod 25. The electric cylinder 26 pushes the second leg rod 18 to drive the second leg rod 18 to rotate relative to the seat frame 2.

[0047] Reference Figure 1 In order to enable the leg support assembly 4 to drive the front end of the seat frame 2 to rotate upward after being unfolded to the extreme position, a seat frame linkage rod 27 is provided between the connecting seat 9 and the seat frame 2. The leg support assembly 4 is installed on the inner side of the seat frame 2, and the seat frame linkage rod 27 is installed on the outer side of the seat frame 2. A slide groove 28 is provided on the seat frame 2. A limit member 29 is slidably connected in the slide groove 28, and one end of the seat frame linkage rod 27 is rotatably connected to the connecting seat 9 and the other end is rotatably connected to the limit member 29. The limit member 29 is a metal bearing, and the limit member 29 is rotatably connected to the seat frame linkage rod 27 by installing bolts. Refer to Figure 4 The first leg rod 17 forms a limiting plane 30 on the side facing the limiting member 29 .

[0048] When the leg support assembly 4 is unfolded to the limit position, the limit member 29 just moves to the front end of the slide slot 28. When the driving assembly 5 continues to give the second leg rod 18 a thrust, the second leg rod 18 continues to rotate relative to the seat frame 2. However, since the leg support assembly 4 has been unfolded to the limit at this time, the thrust of the driving assembly 5 on the leg support assembly 4 will be transmitted to the seat frame 2 through the limit member 29, thereby driving the entire seat frame 2 to rotate forward relative to the base 1 until it moves to the state required for the lying position. When the seat frame 2 rotates, of course, it will also drive the backrest assembly 3 to rotate to achieve a change in posture. And in the process of the front end of the seat frame 2 rotating upward to the limit position, the limit member 29 just moves to the position abutting against the limit plane 30. At this time, the limit member 29 is located above the limit plane 30.

[0049] In summary, when the sofa extension device is transformed between the three postures, the principle is as follows:

[0050] Reference Figure 2 When the sofa extension device is in a sitting position, the seat frame 2 and the backrest assembly 3 are both in an initial state, and the leg support assembly 4 is in a state of being folded at one end of the seat frame 2.

[0051] Reference Figure 2 and Figure 3When the sofa extension device needs to be changed from the sitting posture to the TV posture, the driving assembly 5 pushes the second leg rod 18 to rotate relative to the seat frame 2, so that the leg support assembly 4 is unfolded relative to the seat frame 2 until the limit position, completing the posture change. At this time, the limiter 29 just moves to the front end of the slide slot 28.

[0052] Reference Figure 3 and Figure 4 When the sofa extension device needs to be turned from the TV posture to the lying posture, the driving assembly 5 continues to push the second leg rod 18. At this time, the leg support assembly 4 has been unfolded to the limit, so the seat frame 2 is driven to rotate relative to the base 1 until the front end of the seat frame 2 rotates upward to the limit position. Of course, at this time, the backrest assembly 3 has also rotated outward to the limit position relative to the seat frame 2, completing the posture change. In this process, the limiter 29 moves to a position abutting against the limit plane 30.

[0053] When the sofa extension device needs to be turned from a lying position to a TV position, the leg support assembly 4 cannot be directly folded because the limiting member 29 has a limiting force on the limiting plane 30. The seat frame 2 first rotates relative to the base 1 to restore to the TV position. There will be no confusion in the retraction order, which improves the user experience.

[0054] Reference Figure 1 In order to better ensure that the sofa extension device runs along the set trajectory, a first elastic member 31 is provided between the armrest mounting plate 6 and the first leg rod 17, and the first elastic member 31 is a spring. One end of the first elastic member 31 is fixedly mounted on the armrest mounting plate 6, and the other end is fixedly mounted on the first leg rod 17. When sitting, the first elastic member 31 exerts a pulling force on the first leg rod 17. When the sitting position is opened to the TV position, the leg support assembly 4 opens first, avoiding the disorder of the order of pushing the seat frame 2 forward first and affecting the body feeling. When lying, the first elastic member 31 exerts a pulling force on the first leg rod 17, so that the leg support assembly 4 is in a fully open state in the lying state.

[0055] A second elastic member 32 is provided between the backrest rod 13 and the connecting reinforcing rod 8. The second elastic member 32 is a spring. One end of the second elastic member 32 is fixedly mounted on the connecting reinforcing rod 8, and the other end is fixedly mounted on the backrest rod 13. When the backrest rod 13 is in a lying position, the second elastic member 32 exerts a pulling force on the backrest rod 13, so that when the backrest rod 13 is retracted from the lying position to the TV position, the seat frame 2 is retracted first, so as to avoid excessive force on the limit member 29 and abnormality.

[0056] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sofa extension device with improved user experience. Features: The invention comprises a base (1), a seat frame (2) rotatably connected to the base (1), a backrest assembly (3) installed at one end of the seat frame (2), a leg support assembly (4) installed at the other end of the seat frame (2), a driving assembly (5) for driving the posture of the extension device to change, and a limiting member (29) installed between the seat frame (2) and the leg support assembly (4); when the extension device changes from a sitting posture to a TV posture and then to a lying posture, and the leg support assembly (4) is unfolded to an extreme position, the limiting member (29) locks the leg support assembly (4) to the seat frame (2); when the extension device is in the TV posture, the seat frame (2) and the backrest assembly (3) are both in an initial state, and the leg support assembly (4) is in a state of being fully unfolded at one end of the seat frame (2); The seat frame (2) is provided with a connecting seat (9) rotatably connected to the base (1); a seat frame linkage rod (27) is provided between the connecting seat (9) and the seat frame (2); one end of the seat frame linkage rod (27) is slidably connected to the seat frame (2) and the other end is rotatably connected to the connecting seat (9); the limiting member (29) is installed on the seat frame linkage rod (27) and connected to one end of the seat frame (2); when the extending device is changed from a sitting position to a TV position, the limiting member (29) slides forward relative to the seat frame (2) as the leg support assembly (4) is extended, until the leg support assembly (4) moves to an extreme position, and the limiting member (29) slides to the extreme position and cannot continue to slide forward; when the extending device is changed from a TV position to a lying position, the limiting member (29) moves with the seat frame (2) to a state of being pressed against the leg support assembly (4), so that the leg support assembly (4) cannot be folded; The leg support assembly (4) is installed on the inner side of the seat frame (2), the seat frame linkage rod (27) is installed on the outer side of the seat frame (2), a slide groove (28) is provided on the seat frame (2), and the limit member (29) passes through the slide groove (28) and is slidably connected in the slide groove (28); The leg support assembly (4) comprises a leg connecting rod assembly, a foot supporting seat (15) and a foot supporting rod (16); the leg connecting rod assembly is connected to one end of the seat frame (2) and is connected to the driving assembly (5); the foot supporting seat (15) is connected to the end of the leg connecting rod assembly away from the seat frame (2); the foot supporting rod (16) is rotatably connected to the foot supporting seat (15); when the leg connecting rod assembly is unfolded, the foot supporting rod (16) is rotatably unfolded relative to the foot supporting seat (15); The leg connecting rod assembly comprises a first leg rod (17) rotatably connected to the seat frame (2), the first leg rod (17) forming a limiting plane (30) towards a side of the limiting member (29); when the stretching device changes from a TV posture to a lying posture, the limiting member (29) moves to a position abutting against the limiting plane (30); The limiting member (29) is rotatably connected to the seat frame linkage rod (27) via mounting bolts; When the sofa extension device needs to be changed from a sitting position to a TV position, the leg support assembly (4) is unfolded relative to the seat frame (2) until it reaches the limit position, thus completing the posture change; at this time, the limit member (29) just moves to the front end of the slide groove (28); When the sofa extension device needs to be turned from a TV posture to a lying posture, the leg support assembly (4) has been unfolded to the limit, so the seat frame (2) is driven to rotate relative to the base (1) until the front end of the seat frame (2) rotates upward to the limit position; at this time, the backrest assembly (3) has also rotated outward to the limit position relative to the seat frame (2), completing the posture change; during this process, the limiting member (29) moves to a position abutting against the limiting plane (30); When the sofa extension device needs to be turned from a lying position to a TV position, the leg support assembly (4) cannot be directly folded because the limiting member (29) exerts a limiting force on the limiting plane (30); the seat frame (2) is first rotated relative to the base (1) to restore the position to the TV position.

2. A sofa stretching device with improved user experience according to claim 1, Features: The limiting member (29) is cylindrical and is rotatably connected to the seat frame linkage rod (27).

3. A sofa stretching device with improved user experience according to claim 1, Features: A first elastic member (31) is provided between the base (1) and the first leg rod (17), and the first elastic member (31) is used to pull the first leg rod (17) inwardly so that the limiting plane (30) on the first leg rod (17) stably abuts against the limiting member (29).

4. A sofa stretching device with improved user experience according to claim 1, Features: The backrest assembly (3) comprises a backrest rod (13) rotatably connected to the base (1), and a second elastic member (32) is provided between the backrest rod (13) and the base (1) for keeping the backrest rod (13) in a sitting position.

5. A sofa stretching device with improved user experience according to claim 1, Features: The leg connecting rod assembly also includes a second leg rod (18), which is rotatably connected to the seat frame (2) and is located outside the first leg rod (17), and the driving assembly (5) is connected to the second leg rod (18).

6. A sofa stretching device with improved user experience according to claim 5, Features: The leg connecting rod group also includes a third leg rod (19) and a fourth leg rod (20) which are parallel to each other. One end of the third leg rod (19) is rotatably connected to the first leg rod (17) and the other end is rotatably connected and slidably connected to the foot support seat (15). One end of the fourth leg rod (20) is rotatably connected to the second leg rod (18) and the other end is rotatably connected to the foot support seat (15). A first guide component is provided between the third leg rod (19) and the fourth leg rod (20). When the second leg rod (18) rotates, the third leg rod (19) and the fourth leg rod (20) rotate synchronously and slide relative to each other along their length directions.

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