CN218008984U

CN218008984U - Sofa stretching device with improved experience feeling

Info

Publication number: CN218008984U
Application number: CN202122299398.1U
Authority: CN
Inventors: 冯元峰; 吴林林; 蔡昌能; 王志禹
Original assignee: Zhejiang Mimeng Home Technology Co ltd
Current assignee: Zhejiang Mimeng Home Technology Co ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-12-13
Anticipated expiration: 2031-09-18

Abstract

The application relates to a sofa stretching device with improved experience feeling, which comprises a base, a seat frame, a backrest assembly, a leg support assembly, a driving assembly and a limiting piece, wherein the seat frame is rotatably connected to the base; when the stretching device changes from a lying posture to a TV posture and then to a sitting posture, and the seat frame rotates to the limit position relative to the base, the limiting piece unlocks the leg support assembly. The situation that the leg supporting assembly is firstly folded when the stretching device is changed from the lying posture to the TV posture is avoided, and the phenomenon that the withdrawing sequence of each part of the stretching device is disordered to influence the body feeling is avoided.

Description

Sofa stretching device with improved experience feeling

Technical Field

The application relates to the field of intelligent furniture, in particular to a sofa stretching device with improved use experience.

Background

The prior multifunctional sofa generally has three states of sitting posture, TV posture and lying posture in order to meet different use requirements of people. During posture adjustment, if the TV posture needs to be changed into the lying posture, the seat frame can rotate relative to the base, and the synchronous leg support assembly can rotate and unfold relative to the seat frame, so that posture change is realized. However, when the user changes from the lying position to the TV position, the user often feels that the leg support unit is retracted first because the leg support unit and the seat frame move simultaneously, which results in poor user experience.

SUMMERY OF THE UTILITY MODEL

In order to improve the body feeling of use,

the application provides a sofa stretching device that experience improves of using adopts following technical scheme:

a sofa stretching device with improved use experience comprises a base, a seat frame rotatably connected to the base, a backrest assembly mounted at one end of the seat frame, a leg support assembly mounted at the other end of the seat frame, a driving assembly used for driving the stretching device to change in posture, and a limiting piece mounted between the seat frame and the leg support assembly, wherein when the stretching device changes from a sitting posture to a TV posture and then to a lying posture, and the leg support assembly is stretched to a limit position, the limiting piece locks the leg support assembly on the seat frame; when the stretching device is changed from the lying posture to the TV posture and then to the sitting posture, the seat frame rotates to the limit position relative to the base, and the limiting piece unlocks the leg support assembly.

By adopting the technical scheme, after the stretching device is changed into the TV posture from the sitting posture, the leg supporting component is locked with the seat frame, so that the leg supporting component is still locked with the seat frame in the lying posture, and the leg supporting component cannot be unfolded or folded. When the stretching device is changed from the lying posture to the TV posture, the leg support component can be unlocked and folded only after the seat frame moves to a certain angle. The situation that the leg supporting assembly is firstly folded when the stretching device is changed from the lying posture to the TV posture is avoided, and the situation that the withdrawing sequence of each part of the stretching device is disordered to influence the body feeling is avoided.

Optionally, the seat frame is provided with a connecting seat rotatably connected to the base, a seat frame linkage rod is arranged between the connecting seat and the seat frame, one end of the seat frame linkage rod is slidably connected to the seat frame, the other end of the seat frame linkage rod is rotatably connected to the connecting seat, and the limiting member is mounted at one end of the seat frame linkage rod connected to the seat frame; when the stretching device is changed into a TV posture from a sitting posture, the limiting piece slides forwards relative to the seat frame along with the stretching of the leg supporting assembly until the leg supporting assembly moves to the limit position, and the limiting piece slides to the limit position and cannot slide forwards continuously; when the stretching device changes from the TV posture to the lying posture, the limiting piece moves along with the seat frame to a state of being tightly propped against the leg supporting component, so that the leg supporting component cannot be folded.

By adopting the technical scheme, when the seat frame is in the front end tilting state, the state of the leg supporting component is certainly in the unfolding state, and the limiting component abuts against the leg supporting component, so that the leg supporting component cannot be folded. Thereby playing a better role of preventing running disorder.

Optionally, the leg supporting assembly is installed inside the seat frame, the seat frame linkage rod is installed outside the seat frame, a sliding groove is formed in the seat frame, and the limiting part penetrates through the sliding groove and is connected in the sliding groove in a sliding manner.

Through adopting above-mentioned technical scheme, make shank supporting component's whole width be less than the whole width of seat frame to make overall structure compacter stable.

Optionally, the leg support assembly includes a leg linkage, a foot support seat and a foot support rod, the leg linkage is connected to one end of the seat frame and is connected to the driving assembly, the foot support seat is connected to one end of the leg linkage away from the seat frame, and the foot support rod is rotatably connected to the foot support seat; when the leg connecting set is unfolded, the foot supporting rod rotates and unfolds relative to the foot supporting seat.

Through adopting above-mentioned technical scheme, realize drawing in and expanding of shank supporting component, simple structure, the operation is smooth and easy.

Optionally, the leg link assembly includes a first leg rod rotatably connected to the seat frame, and a limiting plane is formed on one side of the first leg rod facing the limiting member; when the stretching device is changed from the TV posture to the lying posture, the limiting piece moves to a position abutting against the limiting plane.

Through adopting above-mentioned technical scheme, locating part and spacing plane cooperation to make the locating part more stable carry on spacingly to shank supporting component.

Optionally, the limiting part is cylindrical and is rotatably connected to the seat frame linkage rod.

Through adopting above-mentioned technical scheme to make the resistance that the locating part received when relative spacing plane slides littleer, make locating part can be more smooth and easy relative seat frame and the slip of first leg pole.

Optionally, a first elastic element is disposed between the base and the first leg rod, and the first elastic element is used for pulling the first leg rod inward, so that the limiting plane on the first leg rod is stably abutted to the limiting element.

Through adopting above-mentioned technical scheme, first elastic component has the effect of a pulling force to first leg pole, when the position of sitting is opened to the TV appearance, makes shank supporting component open earlier, has avoided the seat frame to push forward earlier and leads to the order in disorder, influences the body and feels. When the user lies, the first elastic piece has a pulling effect on the first leg rod, so that the leg supporting assembly is in a fully opened state in the lying state.

Optionally, the backrest assembly comprises a backrest rod rotatably connected to the base, and a second elastic member for keeping the backrest rod in a sitting posture is arranged between the backrest rod and the base.

By adopting the technical scheme, the second elastic piece has a tension effect on the backrest assembly, so that when the backrest assembly is retracted to the TV posture in the lying posture, the seat frame is retracted first, and the phenomenon that the limiting piece is stressed excessively and abnormal is avoided.

Optionally, the leg linkage further includes a second leg bar, the second leg bar is rotatably connected to the seat frame and located outside the first leg bar, and the driving assembly is connected to the second leg bar.

Through adopting above-mentioned technical scheme to make drive assembly can not interfere the locating part, simultaneously can also stable drive shank supporting component expand and draw in.

Optionally, the leg linkage still includes third leg pole and fourth leg pole that are parallel to each other, third leg pole one end is rotated and is connected in first leg pole and other end rotation connection and sliding connection in foot's supporting seat, fourth leg pole one end is rotated and is connected in second leg pole and other end rotation and is connected in foot's supporting seat, be equipped with first direction subassembly between third leg pole and the fourth leg pole, when first direction subassembly made second leg pole rotate, third leg pole and fourth leg pole synchronous rotation just followed its length direction relative slip.

By adopting the technical scheme, the leg supporting component can be smoothly unfolded and folded, and meanwhile, potential safety hazards of hand clamping caused by relative rotation between the third leg rod and the fourth leg rod cannot be caused.

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

1. the structure is simple, the volume is small, and the operation is smooth;

2. the structure for preventing the running from being disordered is arranged, and the leg supporting assembly cannot be folded first in the process of changing the lying posture into the TV posture, so that the user feels better;

3. the potential safety hazard is small.

Drawings

Fig. 1 is a schematic structural view of the lying posture of the embodiment.

Fig. 2 is a right side view of the embodiment in a sitting position.

Fig. 3 is a right side view of the embodiment in the TV position.

Fig. 4 is a right side view of the embodiment in a lying position.

Fig. 5 is a left side view of the embodiment in a lying position.

Description of the reference numerals: 1. a base; 2. a seat frame; 3. a backrest assembly; 4. a leg support assembly; 5. a drive assembly; 6. a handrail mounting plate; 7. a backrest mounting plate; 8. connecting a reinforcing rod; 9. a connecting seat; 10. a first guide groove; 11. a first guide shaft; 12. a first limit nail; 13. a back rest lever; 14. a second limit pin; 15. a foot support base; 16. a foot support bar; 17. a first leg bar; 18. a second leg bar; 19. a third leg bar; 20. a fourth leg bar; 21. a second guide groove; 22. a second guide shaft; 23. a limiting sheet; 24. a third limit nail; 25. a dowel bar; 26. an electric cylinder; 27. a seat frame linkage rod; 28. a chute; 29. a stopper; 30. a limiting plane; 31. a first elastic member; 32. a second elastic member; 33. a foot linkage rod; 34. an extension rod; 35. a third guide shaft; 36. a third guide groove; 37. a reinforcing plate.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a sofa stretching device with improved experience. Referring to fig. 1, a sofa stretching device with improved experience includes a base 1, a seat frame 2 rotatably connected to the base 1, two backrest components 3 respectively installed at two sides of one end of the seat frame 2, two leg support components 4 respectively installed at two sides of the other end of the seat frame 2, and a driving component 5 for driving the stretching device to change posture. The end of the seat frame 2 close to the leg support assembly 4 is set as the front end, and the end of the seat frame 2 close to the backrest assembly 3 is set as the rear end.

Referring to fig. 2, when the extension apparatus is in a sitting position, the seat frame 2 and the backrest assembly 3 are 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. Referring to fig. 3, in the TV state of the stretching apparatus, the seat frame 2 and the back assembly 3 are in the initial state, and the leg rest assembly 4 is in the state of being completely spread out at one end of the seat frame 2. Referring to fig. 4, when the extension device is in the lying position, the seat frame 2 is slightly forward and the front end of the seat frame 2 is tilted upward, the backrest component 3 rotates outward relative to the seat frame 2, and the leg support component 4 is still fully unfolded at one end of the seat frame 2.

Specifically, referring to fig. 1, the base 1 includes two armrest mounting plates 6, two backrest mounting plates 7, and a connection reinforcing rod 8. The two handrail mounting plates 6 are symmetrically arranged and are positioned at two sides of the seat frame 2. One backrest mounting plate 7 corresponds to one handrail mounting plate 6, and the backrest mounting plate 7 is fixedly mounted at the rear end of the corresponding handrail mounting seat. Two ends of the connecting reinforcing rod 8 are respectively fixedly connected with the lower ends of the two backrest mounting plates 7. In order to enhance the structural strength, a reinforcing plate 37 is arranged between the armrest mounting plate 6 and the backrest mounting plate 7, and two ends of the reinforcing plate 37 are fixedly connected to the armrest mounting plate 6 and the backrest mounting plate 7 respectively.

Referring to fig. 1, the seat frame 2 is provided with connecting seats 9 at both sides thereof. The connecting base 9 has one end rotatably connected to the base frame 2 and the other end rotatably connected to the corresponding armrest mounting plate 6, so that the base frame 2 is rotatably connected to the base 1. Referring to fig. 1 and 4, in order to enable the connecting seat 9 to rotate more stably relative to the seat frame 2, a first guide groove 10 is formed in the connecting seat 9, a first guide shaft 11 is slidably connected in the first guide groove 10, and the first guide shaft 11 is fixedly connected to the armrest mounting plate 6. During the rotation of the connecting base 9 relative to the base frame 2, the first guide shaft 11 slides in the first guide groove 10, so as to play a certain role of guiding and supporting. Referring to fig. 2, the connecting seat 9 is provided with a first limit pin 12, and when the extending device rotates to the sitting posture or the TV posture, the first limit pin 12 abuts against the lower end surface of the seat frame 2 to prevent the seat frame 2 from continuing to rotate downwards.

Referring to fig. 1, the back assembly 3 includes a back rod 13, a lower end of the back rod 13 is rotatably coupled to a rear end of the seat frame 2, and a middle portion of the back rod 13 is rotatably coupled to an upper end of the back 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, and the posture adjustment requirement is met. Referring to fig. 5, a second limit pin 14 is fixed on the back lever 13. When the stretching device rotates to the lying posture, the second limit pin 14 abuts against the backrest mounting plate 7 to prevent the backrest rod 13 from continuously turning downwards.

Referring to fig. 1, the leg support assembly 4 includes a leg linkage, a foot support seat 15 and a foot support bar 16. The leg connecting rod group is unfolded and folded to drive the foot supporting seat 15 and the foot supporting rod 16 to be unfolded and folded, so that the whole leg supporting assembly 4 is unfolded and folded.

Specifically, referring to fig. 1, the leg link assembly includes a first leg bar 17, a second leg bar 18, a third leg bar 19, and a fourth leg bar 20. The first leg lever 17 has one end rotatably connected to the seat frame 2 and the other end rotatably connected to one end of the third leg lever 19. One end of the second leg lever 18 is rotatably connected to the front end of the seat frame 2 and is located at the front side of the first leg lever 17.

Referring to fig. 3, the end of the third leg 19 away from the first leg 17 is pivotally connected to the foot support 15 and slidably connected to the foot support 15. An extension bar 34 extends from the fourth leg bar 20 along the length of the second leg bar 18. The extension rod 34 is provided with a second guide groove 21 along the length direction thereof, the second leg rod 18 is provided with a second guide shaft 22, and the second guide shaft 22 is slidably connected to the second guide groove 21 and rotatably connected to the second guide groove 21. The second leg lever 18 is rotatably connected to the fourth leg lever 20 via a second guide shaft 22. A guide assembly is provided between the third leg bar 19 and the fourth leg bar 20. The fourth leg bar 20 is provided with two third guide grooves 36, and each third guide groove 36 corresponds to one guide assembly, and the third guide grooves 36 are arranged along the length direction of the fourth leg bar 20. The guide assembly comprises a third guide shaft 35 mounted on the third leg bar 19, the third guide shaft 35 passing through a third guide slot 36 and being slidably connected to the third guide slot 36. The third guide shaft 35 is provided with a limiting piece 23, and the fourth leg rod 20 is positioned between the limiting piece 23 and the third leg rod 19. One end of the foot supporting rod 16 is rotatably connected to the foot supporting seat 15, a foot linkage rod 33 is arranged between the foot supporting rod 16 and the fourth leg rod 20, and two ends of the foot linkage rod 33 are respectively rotatably connected to the foot supporting rod 16 and the fourth leg rod 20.

The leg support assembly 4 is changed from the folded state to the unfolded state by rotating the second leg bar 18 with respect to the seat frame 2 and then rotating the first leg bar 17 with respect to the seat frame 2, thereby unfolding the leg linkage outwardly. At this time, the third leg rod 19 and the fourth leg rod 20 relatively move along the length direction of the second guide slot 21, so as to drive the foot support base 15 to rotate and unfold; meanwhile, 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 component 4. At this time, since there is no gap change between the third leg bar 19 and the fourth leg bar 20 with the rotation, the safety hazard of the hand clamping is reduced.

Referring to fig. 5, a third limit pin 24 is provided on the second leg bar 18. When the stretching device rotates to the lying position, the third limit nail 24 abuts against the lower end surface of the seat frame 2 to prevent the leg support assembly 4 from continuously extending outwards.

Referring to fig. 1, the drive assembly 5 includes an electric cylinder 26 and a dowel bar 25. Both ends of the dowel bar 25 are fixedly arranged on the two second leg rods 18 respectively. One end of the electric cylinder 26 is fixedly arranged on the connection reinforcing rod 8, and the other end is fixedly arranged in the middle of the dowel bar 25. The second leg lever 18 is pushed by the electric cylinder 26 to rotate the second leg lever 18 relative to the seat frame 2.

Referring to fig. 1, in order to make the leg supporting assembly 4 rotate upward after being unfolded to the extreme position, the front end of the seat frame 2 is driven to rotate upward, and a seat frame linkage rod 27 is arranged between the connecting seat 9 and the seat frame 2. The leg support assembly 4 is mounted inside the seat frame 2 and the seat frame linkage rod 27 is mounted outside the seat frame 2. The seat frame 2 is provided with a sliding groove 28. A limiting member 29 is slidably connected in the sliding slot 28, and one end of the seat frame linkage rod 27 is rotatably connected to the connecting seat 9 and the other end thereof is rotatably connected to the limiting member 29. The limiting part 29 is a metal bearing, and the limiting part 29 is rotatably connected to the seat frame linkage rod 27 through a mounting bolt. Referring to fig. 4, the first leg bar 17 forms a stopper plane 30 toward the stopper 29.

When the leg support assembly 4 is deployed to the extreme position, the stop 29 moves just to the front end of the slide slot 28. When the driving component 5 continues to push the second leg rod 18, the second leg rod 18 continues to rotate relative to the seat frame 2, but at this time, because the leg supporting component 4 is already unfolded to the limit, the pushing force of the driving component 5 to the leg supporting component 4 is transmitted to the seat frame 2 through the limiting component 29, so that the seat frame 2 is driven to rotate and push forward relative to the base 1 until the seat frame moves to the state required by the lying posture. When the seat frame 2 rotates, the backrest component 3 is driven to rotate, and the posture is changed. And in the process that the front end of the seat frame 2 rotates upwards to the limit position, the limiting member 29 just moves to the position abutting against the limiting plane 30. The limiting member 29 is located above the limiting plane 30.

In summary, the principle of the change between the three postures of the sofa stretching device is as follows:

referring to fig. 2, in the sitting position of the sofa extension device, the seat frame 2 and the backrest assembly 3 are both in the initial state, and the leg support assembly 4 is in the state of being folded at one end of the seat frame 2.

Referring to fig. 2 and 3, when the sofa stretching device needs to be turned from the sitting posture to the TV posture, the driving assembly 5 pushes the second leg bar 18 to be turned relative to the seat frame 2, so that the leg supporting assembly 4 is unfolded relative to the seat frame 2 until the extreme position, completing the posture transition. The stop element 29 now moves just to the front end of the slide groove 28.

Referring to fig. 3 and 4, when the sofa stretching device needs to be changed from the TV position to the lying position, the driving assembly 5 continues to push the second leg rod 18, and the leg support assembly 4 is already unfolded to the limit, so that the seat frame 2 is driven to rotate relative to the base frame 1 until the front end of the seat frame 2 rotates upwards to the limit position. Of course, at this time, the backrest module 3 has also been rotated outwards relative to the seat frame 2 to the limit position, and the posture conversion is completed. In the process, the limiting member 29 moves to a position abutting against the limiting plane 30.

When the sofa stretching device needs to be changed from the lying posture to the TV posture, the leg support assembly 4 cannot be folded directly because the limiting piece 29 has a limiting force on the limiting plane 30. The seat frame 2 is firstly rotated relative to the base 1, thereby restoring to the TV posture. The withdrawing sequence is not disordered, and the use body feeling is improved.

Referring to fig. 1, in order to better ensure that the sofa extension device runs along the set track, a first elastic member 31 is arranged between the armrest mounting plate 6 and the first leg rod 17, and the first elastic member 31 is a spring. The first elastic member 31 has one end fixedly attached to the armrest mounting plate 6 and the other end fixedly attached to the first leg lever 17. When sitting, the first elastic element 31 has a pulling force on the first leg rod 17, and when the sitting is opened to the TV position, the leg supporting component 4 is opened first, so that the problem that the seat frame 2 is pushed forwards first and the sequence is disordered to influence the body feeling is avoided. In the lying position, the first elastic member 31 exerts a pulling force on the first leg bar 17, so that the leg support assembly 4 is in the fully open position in the lying position.

A second elastic piece 32 is arranged between the backrest rod 13 and the connecting reinforcement rod 8, and the second elastic piece 32 is a spring. One end of the second elastic member 32 is fixedly mounted to the connection reinforcing bar 8, and the other end is fixedly mounted to the back lever 13. When the user lies, the second elastic piece 32 exerts a pulling force on the backrest rod 13, so that when the user lies and retracts into the TV position, the seat frame 2 is retracted first, and the situation that the limiting piece 29 is stressed too much and is abnormal is avoided.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A sofa stretching device with improved experience is characterized in that: the multifunctional stretching device comprises a base (1), a seat frame (2) rotatably connected to the base (1), a backrest component (3) installed at one end of the seat frame (2), a leg supporting component (4) installed at the other end of the seat frame (2), a driving component (5) used for driving the stretching device to change in posture, and a limiting piece (29) installed between the seat frame (2) and the leg supporting component (4), wherein when the stretching device changes from a sitting posture to a TV posture and then changes into a lying posture, and the leg supporting component (4) is unfolded to a limit position, the limiting piece (29) locks the leg supporting component (4) on the seat frame (2); when the stretching device is changed from the lying posture to the TV posture and then to the sitting posture, the seat frame (2) rotates to the limit position relative to the base (1), and the limiting piece (29) unlocks the leg support assembly (4).

2. The sofa extension apparatus with enhanced experience according to claim 1, wherein: the base frame (2) is provided with a connecting seat (9) which is rotatably connected to the base (1), a base frame linkage rod (27) is arranged between the connecting seat (9) and the base frame (2), one end of the base frame linkage rod (27) is slidably connected to the base frame (2) while the other end of the base frame linkage rod is rotatably connected to the connecting seat (9), and the limiting piece (29) is arranged at one end of the base frame linkage rod (27) which is connected to the base frame (2); when the stretching device is changed from a sitting posture to a TV posture, the limiting piece (29) slides forwards relative to the seat frame (2) along with the stretching of the leg supporting component (4) until the leg supporting component (4) moves to a limit position, and the limiting piece (29) slides to the limit position and cannot slide forwards continuously; when the stretching device is changed from the TV posture to the lying posture, the limiting piece (29) moves along with the seat frame (2) to be in a state of being tightly propped against the leg supporting component (4), so that the leg supporting component (4) cannot be folded.

3. The sofa extension apparatus with enhanced experience according to claim 2, wherein: the leg supporting 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 sliding groove (28) is formed in the seat frame (2), and the limiting piece (29) penetrates through the sliding groove (28) and is connected into the sliding groove (28) in a sliding mode.

4. The sofa extension apparatus with enhanced experience according to claim 2, wherein: the leg supporting assembly (4) comprises a leg connecting rod set, a leg supporting seat (15) and a leg supporting rod (16), the leg connecting rod set is connected to one end of the seat frame (2) and is connected with the driving assembly (5), the leg supporting seat (15) is connected to one end, away from the seat frame (2), of the leg connecting rod set, and the leg supporting rod (16) is rotatably connected to the leg supporting seat (15); when the leg connecting set is unfolded, the foot supporting rod (16) rotates and unfolds relative to the foot supporting seat (15).

5. The sofa extension apparatus with enhanced experience according to claim 4, wherein: the leg connecting rod group comprises a first leg rod (17) rotatably connected to the seat frame (2), and one side, facing the limiting piece (29), of the first leg rod (17) forms a limiting plane (30); during the process of changing the stretching device from the TV posture to the lying posture, the limiting piece (29) moves to a position abutting against the limiting plane (30).

6. The sofa extension apparatus with enhanced experience according to claim 5, wherein: the limiting piece (29) is cylindrical, and the limiting piece (29) is rotatably connected to the seat frame linkage rod (27).

7. The sofa extension apparatus with enhanced experience according to claim 5, wherein: a first elastic piece (31) is arranged between the base (1) and the first leg rod (17), and the first elastic piece (31) is used for pulling the first leg rod (17) inwards to enable a limiting plane (30) on the first leg rod (17) to be stably abutted to the limiting piece (29).

8. The sofa extension apparatus with enhanced experience according to claim 5, wherein: the backrest component (3) comprises a backrest rod (13) rotatably connected to the base (1), and a second elastic piece (32) used for keeping the backrest rod (13) in a sitting posture state is arranged between the backrest rod (13) and the base (1).

9. The sofa extension device with enhanced experience according to claim 5, wherein: the leg linkage further comprises a second leg rod (18), the second leg rod (18) is rotatably connected to the seat frame (2) and located on the outer side of the first leg rod (17), and the driving assembly (5) is connected to the second leg rod (18).

10. The sofa extension device with enhanced use experience according to claim 9, wherein: the shank linkage still includes third leg pole (19) and fourth leg pole (20) that are parallel to each other, third leg pole (19) one end rotates to be connected in first leg pole (17) and other end rotation connection and sliding connection in foot supporting seat (15), fourth leg pole (20) one end rotates to be connected in second leg pole (18) and other end rotation and connects in foot supporting seat (15), be equipped with first guide assembly between third leg pole (19) and fourth leg pole (20), when first guide assembly made second leg pole (18) rotate, third leg pole (19) and fourth leg pole (20) synchronous rotation just along its length direction relative slip.