A mechanical extension device for a functional sofa with a stabilizing mechanism

Abstract

The present application relates to a functional sofa mechanical extension device with a stabilizing mechanism, comprising an armrest mounting plate, a seat frame, two connecting components respectively connected to the two sides of the seat frame, the connecting components comprising a front seat frame support link, a rear seat frame support link, a forward connecting piece and a suspension swing component, the front seat frame support link and the rear seat frame support link are both rotatably connected to the seat frame, the two ends of the forward connecting piece are respectively rotatably connected to the front seat frame support link and the rear seat frame support link, the forward connecting piece is connected to the armrest mounting plate through the suspension swing component, a stabilizing link is connected between the two suspension swing components, and the stabilizing link is connected to the suspension swing component. When the sofa changes from a sitting position to a lying position, the stabilizing link moves with the movement of the suspension swing component, the torque becomes larger, and the seat frame is more stable and less likely to twist.

Description

Technical Field

[0001] The present application relates to the field of home furnishings, and in particular to a functional sofa mechanical extension device with a stabilizing mechanism. Background Art

[0002] A functional sofa refers to a sofa with multiple functions. The sofa can be converted into three positions: sitting position, TV position and lying position.

[0003] The existing sofa functional iron frame uses electric cylinders to provide driving force for posture change. Since the electric cylinder is generally located in the middle of the functional iron frame, it is impossible to be in the middle during installation. Therefore, when the sofa iron frame is driven by the driving force to change its posture, the forces on both sides of the seat frame are inconsistent, which is easy to twist and has poor stability. Summary of the invention

[0004] In order to improve the stability of the sofa,

[0005] The present application provides a functional sofa mechanical extension device with a stabilizing mechanism, which adopts the following technical solution:

[0006] A functional sofa mechanical extension device with a stabilizing mechanism comprises an armrest mounting plate, a seat frame, two connecting components respectively connected to both sides of the seat frame, the connecting components comprising a front seat frame supporting link, a rear seat frame supporting link, a forward connecting piece and a suspension swinging component, the front seat frame supporting link and the rear seat frame supporting link are both rotatably connected to the seat frame, two ends of the forward connecting piece are respectively rotatably connected to the front seat frame supporting link and the rear seat frame supporting link, the forward connecting piece is connected to the armrest mounting plate through the suspension swinging component, and a stabilizing link is connected between the two suspension swinging components.

[0007] By adopting the above technical solution, when the sofa changes from a sitting position to a lying position, the stabilizing link moves along with the movement of the suspension swing assembly, and the torque becomes larger, thereby making the seat frame more stable and less prone to twisting.

[0008] Optionally, when the sofa is turned from a sitting position to a lying position, the stabilizing link is driven by the suspension swing assembly to rotate backward, and the distance between the stabilizing link and the seat frame becomes larger.

[0009] By adopting the above technical solution, the stabilizing link rotates following the movement of the suspension swing assembly, the distance from the seat frame seat surface becomes larger, the torque becomes larger, and the stability is better.

[0010] Optionally, the stabilizing link is connected to the front end of the suspension swing assembly.

[0011] Optionally, the suspension swing assembly includes a suspension front support, the lower end of the suspension front support is rotatably connected to the front end of the armrest mounting plate, and the stabilizing link is installed on the suspension front support.

[0012] By adopting the above technical solution, when the sofa changes from a sitting position to a lying position, the front support of the suspension swings backward, thereby driving the stabilizing link to rotate. At this time, the distance between the stabilizing link and the seat surface of the seat frame becomes larger, thereby increasing the torque and improving the overall stability of the extension device.

[0013] Optionally, the suspension front support member includes a vertical rod portion and a cross rod portion for connection to a stabilizing link, and the cross rod portion is located on the inner side of the lower end of the vertical rod portion.

[0014] By adopting the above technical solution, the stabilizing link is closer to the center and farther away from the seat surface of the seat frame, thereby achieving a large torque and improving the overall stability of the extension device.

[0015] Optionally, the stabilizing link is connected to the rear end of the suspension swing assembly.

[0016] Optionally, the suspension swing assembly includes a suspension rear support, the lower end of the suspension rear support is rotatably connected to the rear end of the armrest mounting plate, and the stabilizing link is installed on the suspension rear support.

[0017] By adopting the above technical solution, when the sofa changes from a sitting position to a lying position, the rear support of the suspension swings backward, thereby driving the stabilizing link to rotate. At this time, the distance between the stabilizing link and the seat surface of the seat frame becomes larger, thereby increasing the torque and improving the overall stability of the extension device.

[0018] Optionally, the suspension rear support member includes a vertical rod portion and a cross rod portion for connection to a stabilizing link, and the cross rod portion is located on the inner side of the lower end of the vertical rod portion.

[0019] By adopting the above technical solution, the stabilizing link is closer to the center and farther away from the seat surface of the seat frame, thereby achieving a large torque and improving the overall stability of the extension device.

[0020] Optionally, a backrest is installed between the seat frame and the armrest mounting plate, the backrest includes a limit rod, and the armrest mounting plate is provided with a limit pin; when the sofa is in a lying state, the limit rod abuts against the limit pin, so that the backrest will not shake at will.

[0021] By adopting the above technical solution, the backrest has better support force in the lying state, the possibility of the backrest shaking at will is reduced, and the comfort of use is improved.

[0022] Optionally, a return spring is connected between the forward connecting member and the limiting rod, and the return spring is used to assist the backrest and the seat frame to return to a sitting position.

[0023] By adopting the above technical solution, the sofa can be more stable and smooth when changing postures.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] The extension device operates without twisting and has better stability;

[0026] In the lying position, the backrest is limited to prevent the backrest from shaking;

[0027] Has a better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a sofa in the related art when the sofa is in an extended structure and in a sitting position.

[0029] Figure 2 It is a structural schematic diagram of a sofa in a stretched structure lying position in the related art.

[0030] Figure 3 It is a structural schematic diagram of embodiment 1 in a sitting position.

[0031] Figure 4 It is a structural schematic diagram of the connection component in Example 1.

[0032] Figure 5 This is a top view of the connection component in Example 1.

[0033] Figure 6 It is a structural schematic diagram of embodiment 1 when the sitting position turns to the lying position.

[0034] Figure 7 It is a front view of the embodiment 1 in a sitting position.

[0035] Figure 8 It is a partial schematic diagram of embodiment 1 in a lying position.

[0036] Fig. 9 It is a structural schematic diagram of embodiment 2 in a sitting position.

[0037] Fig.10 It is a structural schematic diagram of embodiment 2 when the sitting position turns to the lying position.

[0038] Description of the accompanying drawings: 1. armrest mounting plate; 2. seat frame; 3. backrest; 4. leg support; 5. connection assembly; 6. reinforcement rod; 7. drive member; 8. front seat frame support link; 9. rear seat frame support link; 10. forward connection member; 11. front suspension swing rod; 12. rear suspension swing rod; 13. suspension front support member; 14. suspension rear support member; 15. first intermediate rod; 16. second intermediate rod; 17. same Step rod; 18, first rod; 19, second rod; 20, third rod; 21, fourth rod; 22, leg support seat; 23, foot support seat; 24, force transmission rod; 25, linkage rod; 26, backrest connecting seat; 27, backrest rod; 28, first backrest support rod; 29, second backrest support rod; 30, limit rod; 31, limit pin; 32, connecting pin; 33, stabilizing connecting rod; 34, vertical rod; 35, horizontal rod. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-8 This application is described in further detail.

[0040] Reference Figure 1 and Figure 2 In the related art, the sofa extension structure includes an armrest mounting plate 1, a seat frame 2, a backrest 3, a leg support 4 and a connecting assembly 5. The backrest 3 is rotatably connected to the armrest mounting plate 1. Two connecting assemblies 5 are provided and are respectively located on both sides of the seat frame 2, and one connecting assembly 5 corresponds to one armrest mounting plate 1. The seat frame 2 is swingably connected to the armrest mounting plate 1 through the connecting assembly 5. The leg support 4 is rotatably connected to one end of the seat frame 2 and the leg support 4 can be unfolded and folded. The end of the seat frame 2 close to the leg support 4 is set as the front end, and the end of the seat frame 2 close to the backrest 3 is set as the rear end.

[0041] Specifically, refer to Figure 1 and Figure 2 The connection assembly 5 includes a front seat frame support link 8, a rear seat frame support link 9, a forward connection member 10 and a suspension swing assembly. The front seat frame support link 8 and the rear seat frame support link 9 are respectively rotatably connected to the seat frame 2, and the front seat frame support link 8 is located in front of the rear seat frame support link 9. Both ends of the forward connection member 10 are respectively rotatably connected to the lower end of the front seat frame support link 8 and the lower end of the rear seat frame support link 9. The forward connection member 10 is connected to the armrest mounting plate 1 through the suspension swing assembly.

[0042] When the sofa is in a sitting position, the leg support part 4 is folded under the seat frame 2, and the upper end of the front seat frame support link 8 is located in front of the lower end. When the sofa posture changes from a sitting position to a lying position, the seat frame 2 moves forward relative to the armrest mounting plate 1, and the leg support part 4 rotates and unfolds. At this time, the upper end of the front seat frame support link 8 moves forward with the seat frame 2, resulting in a forward rotation relative to the lower end of the front seat frame support link 8, so that the front seat frame support link 8 is more forward-leaning relative to the armrest mounting plate 1, and the seat frame 2 is not lifted. If the seat height of the seat frame 2 is lowered, it will cause interference when the leg support part 4 is subsequently unfolded. Therefore, the seat height of the general functional sofa is relatively high, and the sitting feeling is poor.

[0043] Reference Figure 2 In order to make the connecting components 5 on both sides of the seat frame 2 move synchronously better, a stabilizing link 33 is connected between the two forward connecting members 10. However, during operation, the seat frame 2 is easy to twist as a whole and has poor stability.

[0044] Embodiment 1:

[0045] The present application embodiment discloses a functional sofa mechanical extension device with a stabilizing mechanism. Figure 3 A functional sofa mechanical extension device with a stabilizing mechanism comprises an armrest mounting plate 1, a seat frame 2, a backrest portion 3, a leg support portion 4, a connecting assembly 5 and a driving member 7. Two armrest mounting plates 1 are provided and are respectively located on both sides of the seat frame 2, a reinforcing rod 6 is provided between the armrest mounting plates 1, and both ends of the reinforcing rod 6 are respectively fixedly connected to the two armrest mounting plates 1. The backrest portion 3 is rotatably connected to the armrest mounting plate 1, and the seat frame 2 is swingably connected to the armrest mounting plate 1 through the connecting assembly 5. Two connecting assemblies 5 are provided and are respectively located on both sides of the seat frame 2. The leg support portion 4 is rotatably connected to one end of the seat frame 2 and the leg support portion 4 can be unfolded and folded. The driving member 7 is used to provide power for changing the posture of the sofa.

[0046] In order to improve the sitting feeling, the seat height of the extension device is reduced by 3cm to 11cm to 18cm, and the seat depth of the extension device is deepened by 70cm to 90m. The seat height of the extension device here is the distance between the upper end surface of the seat frame 2 and the lowest end of the extension device, and the seat depth of the extension device is the length from the backrest 3 to the front end of the extension device. The requirements of lowering the seat height of the sofa, deepening the seat depth, and improving the sitting feeling are achieved.

[0047] Specifically, refer to Figure 3 The connection assembly 5 includes a front seat frame support link 8, a rear seat frame support link 9, a forward connection member 10 and a suspension swing assembly. The front seat frame support link 8 and the rear seat frame support link 9 are respectively rotatably connected to the seat frame 2, and the front seat frame support link 8 is located in front of the rear seat frame support link 9. Both ends of the forward connection member 10 are respectively rotatably connected to the lower end of the front seat frame support link 8 and the lower end of the rear seat frame support link 9. The forward connection member 10 is connected to the armrest mounting plate 1 through the suspension swing assembly.

[0048] Reference Figure 4 and Figure 5 The suspension swing assembly includes a front suspension swing rod 11, a rear suspension swing rod 12, a suspension front support 13, a suspension rear support 14, a first intermediate rod 15 and a second intermediate rod 16. The front suspension swing rod 11 and the rear suspension swing rod 12 are respectively rotatably connected to the two ends of the inner side of the forward connecting member 10. The two ends of the first intermediate rod 15 are respectively rotatably connected to the middle of the rear suspension swing rod 12 and the middle of the forward connecting member 10. The middle of the suspension rear support 14 is rotatably connected to the upper end of the rear suspension swing rod 12, and the lower end of the suspension rear support 14 is rotatably connected to the armrest mounting plate 1. The two ends of the second intermediate rod 16 are respectively rotatably connected to the upper end of the suspension rear support 14 and the middle of the front suspension swing rod 11. The upper end of the suspension front support 13 is rotatably connected to the upper end of the front suspension swing rod 11, and the lower end of the suspension front support 13 is rotatably connected to the armrest mounting plate 1.

[0049] Reference Figure 3 and Figure 6 In order to improve the stability of the seat frame 2, a stabilizing link 33 is provided between the two rear suspension supports 14, and both ends of the stabilizing link 33 are respectively fixedly connected to the rear suspension supports 14. When the sofa changes from a sitting position to a lying position, the stabilizing link 33 rotates with the rear suspension supports 14, and the distance between the stabilizing link 33 and the seat surface of the seat frame 2 increases, the torque increases, and the stability is better. The probability of the seat frame 2 twisting during use is reduced.

[0050] Specifically, the rear suspension support 14 includes a vertical rod portion 34 connected to the armrest mounting plate 1 and a cross rod portion 35 fixedly connected to the lower end of the vertical rod portion 34. Both ends of the stabilizing link 33 are fixedly connected to the cross rod portion 35 respectively.

[0051] Reference Figure 3 and Figure 6 The leg support part 4 includes two leg support structures located on both sides of the seat frame 2 and a synchronization rod 17 connecting the two leg support structures. The leg support structure includes a first rod 18, a second rod 19, a third rod 20, a fourth rod 21, a leg support seat 22, a foot support seat 23, and a force transmission rod 24. The first rod 18, the second rod 19, the third rod 20, the fourth rod 21, the force transmission rod 24, and the force transmission rod 24 form an expansion and contraction connecting rod group. The leg support seat 22 and the foot support seat 23 are expanded and contracted by the expansion and contraction connecting rod group.

[0052] Specifically, refer to Figure 3 and Figure 6, one end of the first rod 18 is rotatably connected to the seat frame 2. The second rod 19 is parallel to the first rod 18 and is located at the rear end of the first rod 18, and one end of the second rod 19 is rotatably connected to the seat frame 2. One end of the third rod 20 is rotatably connected to the lower end of the first rod 18 and the other end is rotatably connected to the force transmission rod 24. One end of the fourth rod 21 is rotatably connected to the lower end of the second rod 19 and the other end is rotatably connected to the leg support seat 22, and the middle of the fourth rod 21 is rotatably connected to the first rod 18. One end of the force transmission rod 24 away from the third rod 20 is rotatably connected to the middle of the foot support seat 23. One end of the foot support seat 23 is rotatably connected to one end of the leg support seat 22 away from the fourth rod 21. A linkage rod 25 is provided between the front seat frame support link 8 and the second rod 19, and the two ends of the linkage rod 25 are rotatably connected to the front seat frame support link 8 and the second rod 19 respectively. The two ends of the synchronization rod 17 are fixedly connected to the first rods 18 of the two leg support structures respectively. The driving member 7 is an electric cylinder, one end of which is mounted on the reinforcing rod 6 and the other end of which is mounted on the synchronization rod 17 .

[0053] In the sitting position, the leg support part 4 is folded under the seat frame 2. When the sofa needs to be changed from a sitting position to a lying position, the driving member 7 drives the first rod 18 to rotate relative to the seat frame 2, thereby driving the entire leg support part 4 to unfold. At the same time, the second rod 19 rotates and transmits force to the front seat frame support link 8 through the linkage rod 25, thereby driving the entire seat frame 2 to move forward.

[0054] Reference Figure 7 In order to ensure that the leg support part 4 can still be smoothly unfolded after the height of the seat frame 2 is lowered, the upper end of the front seat frame support link 8 is located behind the lower end, that is, the front seat frame support link 8 and the horizontal plane form an obtuse angle. When the sofa posture changes from a sitting position to a lying position, the seat frame 2 moves forward relative to the armrest mounting plate 1, and the upper end of the front seat frame support link 8 moves forward with the seat frame 2, resulting in a forward rotation relative to the lower end of the front seat frame support link 8, so that the angle between the front seat frame support link 8 and the horizontal plane gradually becomes a right angle, so that the seat frame 2 moves forward and is lifted upward. This ensures that when the seat frame 2 is lowered, the leg support part 4 maintains a safe distance from the ground.

[0055] Reference Figure 3 and Figure 8The backrest 3 includes two backrest structures, which are respectively located on both sides of the seat frame 2. The backrest structure includes a backrest connecting seat 26, a backrest rod 27, a first backrest support rod 28, a second backrest support rod 29 and a limit rod 30. The backrest connecting seat 26 is U-shaped and opens upward. The middle part of the backrest connecting seat 26 is fixedly connected to the seat frame 2. One end of the backrest rod 27 is rotatably connected to one end of the backrest connecting seat 26. The upper end of the first backrest support rod 28 is rotatably connected to the middle part of the backrest rod 27, and the other end is rotatably connected to the upper end of the second backrest support rod 29. The upper end of the second backrest support rod 29 is rotatably connected to the end of the backrest connecting seat 26 that is not connected to the backrest rod 27. The lower end of the second backrest support rod 29 is rotatably connected to the limit rod 30. The three points where the second backrest support rod 29 is connected to the first backrest support rod 28, the backrest connecting seat 26 and the limit rod 30 form a triangle. The middle part of the limit rod 30 is rotatably connected to the armrest mounting plate 1. The armrest mounting plate 1 is provided with a limiting nail 31. When the sofa is in a lying position, the limiting rod 30 abuts against the limiting nail 31, so that the backrest rod 27 will not shake at will when in the lying position, thereby improving the comfort of use.

[0056] Reference Figure 3 and Figure 8 In order to facilitate resetting, the forward connecting member 10 and the limiting rod 30 are both provided with connecting pins 32, and a reset spring is installed between the two connecting pins 32. The reset spring is used to give a pulling force to the limiting rod 30, so that when the sofa returns to the sitting position, the limiting rod 30 can be relatively smoothly rotated and reset relative to the armrest mounting plate 1.

[0057] The implementation principle of the mechanical extension device of a functional sofa with a stabilizing mechanism in the embodiment of the present application is as follows:

[0058] By lowering the seat height and deepening the seat depth, the sitting feeling is improved. In the sitting state, the front seat frame support link 8 and the horizontal plane form an obtuse angle. When the sofa posture changes from sitting to lying, the seat frame 2 moves to the front end relative to the armrest mounting plate 1, and the front seat frame support link 8 rotates, so that the angle between the front seat frame support link 8 and the horizontal plane gradually becomes a right angle, so that the seat frame 2 moves forward and is lifted upward. This ensures that when the seat frame 2 is lowered, the leg support part 4 maintains a safe distance from the ground. At the same time, the stabilizing link 33 rotates with the rear support member 14 of the suspension, and the distance between it and the seat surface of the seat frame 2 becomes larger, the torque becomes larger, and the stability is better. As a result, when the sofa posture changes, the seat frame 2 does not twist.

[0059] Embodiment 2:

[0060] The difference between Example 2 and Example 1 is that, referring to Fig. 9 and Fig.10The two ends of the stabilizing link 33 are respectively fixedly connected to the front suspension support 13. When the sofa changes from a sitting position to a lying position, the stabilizing link 33 rotates backward following the swing of the front suspension support 13, and the distance between the stabilizing link 33 and the seat surface of the seat frame 2 increases, the torque increases, and the stability is better, which reduces the probability of the seat frame 2 twisting during use.

[0061] Specifically, the suspension front support member 13 includes a vertical rod portion 34 connected to the armrest mounting plate 1 and a cross rod portion 35 fixedly connected to the lower end of the vertical rod portion 34. Both ends of the stabilizing link 33 are fixedly connected to the cross rod portion 35 respectively.

[0062] 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 mechanical extension device for a functional sofa with a stabilizing mechanism, characterized in that: The invention comprises an armrest mounting plate (1), a seat frame (2), two connecting components (5) respectively connected to both sides of the seat frame (2), the connecting component (5) comprising a front seat frame supporting link (8), a rear seat frame supporting link (9), a forward connecting member (10) and a suspension swinging component, the front seat frame supporting link (8) and the rear seat frame supporting link (9) are both rotatably connected to the seat frame (2), the two ends of the forward connecting member (10) are respectively rotatably connected to the front seat frame supporting link (8) and the rear seat frame supporting link (9), and the forward connecting member (10) is connected to the armrest mounting plate (1) through the suspension swinging component; the suspension swinging component comprises a front suspension swinging rod (11), a rear suspension swinging rod (12), a suspension front supporting member (13), a suspension rear supporting member (14), a first intermediate rod (15) and a second intermediate rod (16), the front suspension swinging rod (11) and the rear suspension swinging rod (12) are connected to the armrest mounting plate (1), and ... The hanging swing rod (11) and the rear hanging swing rod (12) are respectively rotatably connected to the two ends of the inner side surface of the forward moving connecting member (10); the two ends of the first intermediate rod (15) are respectively rotatably connected to the middle of the rear hanging swing rod (12) and the middle of the forward moving connecting member (10); the middle of the hanging rear support member (14) is rotatably connected to the upper end of the rear hanging swing rod (12), and the lower end of the hanging rear support member (14) is rotatably connected to the handrail mounting plate (1); the two ends of the second intermediate rod (16) are respectively rotatably connected to the upper end of the hanging rear support member (14) and the middle of the front hanging swing rod (11); the upper end of the hanging front support member (13) is rotatably connected to the upper end of the front hanging swing rod (11), and the lower end of the hanging front support member (13) is rotatably connected to the handrail mounting plate (1); and a stabilizing link (33) is connected between the two hanging swing components.

2. The functional sofa mechanical extension device with a stabilizing mechanism according to claim 1, characterized in that: When the sofa is turned from a sitting position to a lying position, the stabilizing link is driven by the suspension swing assembly to rotate backward, and the distance between the stabilizing link and the seat frame becomes larger.

3. The mechanical extension device for a functional sofa with a stabilizing mechanism according to claim 2, characterized in that: The stabilizing link (33) is connected to the front end of the suspension swing assembly.

4. The mechanical extension device for a functional sofa with a stabilizing mechanism according to claim 3, characterized in that: The stabilizing link (33) is mounted on the suspension front support (13).

5. The mechanical extension device for a functional sofa with a stabilizing mechanism according to claim 2, characterized in that: The suspension front support member (13) comprises a vertical rod portion (34) and a cross rod portion (35) for connecting with the stabilizing link (33), wherein the cross rod portion (35) is located on the inner side of the lower end of the vertical rod portion (34).

6. The functional sofa mechanical extension device with a stabilizing mechanism according to claim 1, characterized in that: In order to ensure that the leg support part (4) can still be smoothly unfolded after the height of the seat frame (2) is lowered, the upper end of the front seat frame support link (8) is located behind the lower end, that is, the front seat frame support link (8) forms an obtuse angle with the horizontal plane.

7. The mechanical extension device for a functional sofa with a stabilizing mechanism according to claim 6, characterized in that: When the sofa posture changes from a sitting posture to a lying posture, the seat frame (2) moves forward relative to the armrest mounting plate (1), and the upper end of the front seat frame support link (8) moves forward along with the seat frame (2), resulting in a forward rotation relative to the lower end of the front seat frame support link (8), so that the angle between the front seat frame support link (8) and the horizontal plane gradually becomes a right angle, so that the seat frame (2) is lifted upward while moving forward.

8. The functional sofa mechanical extension device with a stabilizing mechanism according to claim 2, characterized in that: The suspension rear support member (14) comprises a vertical rod portion (34) and a horizontal rod portion (35) for connecting with a stabilizing link (33), wherein the horizontal rod portion (35) is located on the inner side of the lower end of the vertical rod portion (34).

9. The functional sofa mechanical extension device with a stabilizing mechanism according to claim 2, characterized in that: A backrest portion (3) is installed between the seat frame (2) and the armrest mounting plate (1), the backrest portion (3) comprising a limiting rod (30), and a limiting pin (31) is provided on the armrest mounting plate (1); when the sofa is in a lying state, the limiting rod (30) abuts against the limiting pin (31), so that the backrest portion (3) will not shake at will.

10. The mechanical extension device for a functional sofa with a stabilizing mechanism according to claim 9, characterized in that: A return spring is connected between the forward moving connecting member (10) and the limiting rod (30), and the return spring is used to assist the backrest portion (3) and the seat frame (2) to return to a sitting position.

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