Anti-tilt extension device for sofa recliner

Abstract

The present application relates to an anti-dumping extension device for a sofa recliner, comprising a base, a seat frame for installing a seat cushion slidably connected to the base, a driving mechanism for driving the seat frame to slide relative to the base, a supporting foot installed at one end of the seat frame, and a linkage component installed on the seat frame, wherein the linkage component is used to transmit the motion pair of the seat frame to the supporting foot, and when the driving mechanism drives the seat frame to move outward, so that the sofa changes from a sitting position to a chaise-like lying position, the linkage component drives the supporting foot to expand relative to the seat frame to support the ground; when the driving mechanism drives the seat frame to move inward, so that the sofa changes from a chaise-like lying position to a sitting position, the linkage component drives the supporting foot to retract relative to the seat frame to leave the ground. During the posture change process, the supporting foot does not slide over a long distance with the ground, reducing the scratches on the ground by the supporting foot when the sofa posture is adjusted.

Description

Technical Field

[0001] The present application relates to the field of sofa furniture, and in particular to an anti-tipping extension device for sofa recliners. Background Art

[0002] At present, there are two postures for sofa recliners, one is sitting posture and the other is chaise-reclining posture. In order to keep the sofa recliner stable in the chaise-reclining posture, a foot is fixedly installed at one end of the sofa cushion. The foot makes the sofa cushion stable when the sofa is in the chaise-reclining posture. When the sofa recliner changes from sitting posture to chaise-reclining posture, the recliner cushion needs to move forward. During the forward movement, the foot will move relative to the ground, leaving movement marks on the ground, which is easy to scratch the ground in the long run. Summary of the invention

[0003] In order to reduce the scratches on the ground caused by the supporting feet during posture adjustment,

[0004] The present application provides an anti-dumping and extending device for a sofa recliner, which adopts the following technical solution:

[0005] An anti-dumping and extending device for a sofa recliner comprises a base, a seat frame slidably connected to the base for mounting a seat cushion, a driving mechanism for driving the seat frame to slide relative to the base, a supporting foot mounted at one end of the seat frame, and a linkage component mounted on the seat frame, wherein the linkage component is used to transmit the motion pair of the seat frame to the supporting foot, and when the driving mechanism drives the seat frame to move outward to change the sofa from a sitting position to a chaise-like lying position, the linkage component drives the supporting foot to expand relative to the seat frame to support the ground; when the driving mechanism drives the seat frame to move inward to change the sofa from a chaise-like lying position to a sitting position, the linkage component drives the supporting foot to retract relative to the seat frame to leave the ground.

[0006] By adopting the above technical solution, when the sofa changes from a sitting position to a chaise-length position, the driving mechanism drives the seat frame to move outward, and the linkage assembly drives the supporting legs to expand relative to the seat frame to support the ground. When the sofa changes from a chaise-length position to a sitting position, the driving mechanism drives the seat frame to move inward, and the linkage assembly drives the supporting legs to retract relative to the seat frame to leave the ground.

[0007] During the posture change process, the support legs do not slide over a long distance with the ground, reducing the scratches on the ground caused by the support legs when the sofa posture is adjusted. At the same time, no additional drive source is required, and the support legs are deployed and retracted according to the movement of the seat frame relative to the base, which saves costs and reduces the occurrence of misoperation that causes the support legs to be deployed when they are not needed.

[0008] Optionally, the support foot is rotatably connected to the seat frame, and the linkage assembly is used to convert the linear motion pair of the seat frame into a rotation pair and then transmit it to the support foot.

[0009] By adopting the above technical solution, the supporting legs can be unfolded and folded by rotating, and the structure is simple. At the same time, when the sofa posture is adjusted, the sliding distance between the supporting legs and the ground is very short, which reduces the scratching of the ground by the supporting legs when the sofa posture is adjusted.

[0010] Optionally, a baffle is provided on the base, and the linkage assembly includes a first link rotatably connected to the seat frame, a second link rotatably connected to the first link, an extension rod fixedly connected to the first link, and a reset member, the second link is rotatably connected to the supporting foot at one end away from the first link, and the seat frame, the supporting foot, the first link and the second link form a four-bar structure; when the seat frame moves outward, the extension rod abuts against the baffle so that the first link rotates relative to the seat frame as the seat frame moves, and the reset member is used to keep the extension rod abutting against the baffle during the retraction of the supporting foot when the seat frame moves inward.

[0011] By adopting the above technical solution, when the sofa changes from a sitting position to a chaise longue position, the driving mechanism drives the seat frame to move outward, and the four-bar structure moves outward together with the seat frame until the extension rod abuts against the stop rod. At this time, the seat frame continues to move outward, and the extension rod is forced to rotate under the abutment of the stop rod, so that the support leg rotates relative to the seat frame, realizing the conversion of the movement of the seat frame into the movement of the support leg, and realizing the deployment of the support leg.

[0012] Optionally, the stop rod is located on the outward side of the extension rod; when the driving mechanism drives the seat frame to move outward for a certain distance, the extension rod abuts against the stop rod, and the driving mechanism continues to drive the seat frame to move outward until the seat frame moves outward to a limit distance, and the supporting foot just rotates to the position supporting the ground.

[0013] By adopting the above technical solution, the sliding distance of the supporting feet relative to the ground during the unfolding process can be reduced as much as possible, thereby further reducing the scratches on the ground caused by the supporting feet when the sofa posture is adjusted.

[0014] Optionally, a bearing is installed on the outer casing of the barrier rod, the bearing is rotatably connected to the barrier rod, and the bearing is used to abut against the extension rod.

[0015] By adopting the above technical solution, when the extension rod rotates relative to the seat frame under the action of the stop rod, the bearing rotates relative to the extension rod, so that rolling friction occurs between the extension rod and the stop rod, thereby making the entire action smoother and more stable.

[0016] Optionally, a limiting shaft is provided on the second connecting rod; when the supporting foot is rotated to a position supported on the ground, the limiting shaft abuts against the supporting foot.

[0017] By adopting the above technical solution, the support legs can be prevented from excessive rotation, ensuring that the support legs can be stably maintained in a state of being supported on the ground when unfolded.

[0018] Optionally, two supporting feet are provided and are respectively located on both sides of the seat frame, and two linkage components are provided, and one linkage component corresponds to one supporting foot.

[0019] By adopting the above technical solution, both sides of the seat frame are supported, so that the seat frame can be more stable when the concubine is in a lying position.

[0020] Optionally, a linkage rod is provided between the two supporting feet, and two ends of the linkage rod are respectively fixedly mounted on the two supporting feet.

[0021] By adopting the above technical solution, the two supporting legs can move as completely synchronously as possible, so that the seat frame can be stably supported by the two supporting legs when moving outward to the extreme position.

[0022] Optionally, the supporting foot includes a fixed portion connected to the seat frame and an adjusting portion slidably connected to the fixed portion, and a locking member for locking the adjusting portion relative to the fixed portion is provided between the fixed portion and the adjusting portion.

[0023] By adopting the above technical solution, the length of the support legs can be adjusted according to the distance between the ground that actually needs to be supported and the seat frame, thereby ensuring that the support legs can stably abut the ground in the unfolded state to support the seat frame.

[0024] Optionally, a roller is installed at the lower end of the supporting foot, and the roller is rotatably connected to the supporting foot, and the supporting foot is supported on the ground through the roller.

[0025] By adopting the above technical solution, when the supporting legs rotate to support the ground, rolling friction occurs between the supporting legs and the ground, further reducing the scratches on the ground caused by the supporting legs when the sofa posture is adjusted.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Reduce the scratches on the ground caused by the supporting feet when the sofa posture is adjusted;

[0028] 2. When the sofa is in the chaise longue position, it can stably support the seat frame;

[0029] 3. No additional driving source is required, and the support legs can change their posture as the seat frame moves, saving costs and reducing misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the embodiment when sitting.

[0031] Figure 2 It is a structural schematic diagram of the embodiment when lying down.

[0032] Figure 3 Schematic diagram of the installation of a single-sided headrest rod, a sliding member and a supporting foot in the embodiment.

[0033] Figure 4 yes Figure 1 Enlarged view of point A in the middle.

[0034] Figure 5 It is a schematic structural diagram of the linkage assembly and the supporting feet in a lying position according to the embodiment.

[0035] Figure 6 yes Figure 2 Enlarged view of point B in the middle.

[0036] Figure 7 It is a schematic diagram of the structure of the linkage assembly and the supporting feet of the embodiment in a sitting position.

[0037] Figure 8 It is a schematic diagram of the structure of the embodiment after the limiting plate is removed.

[0038] Fig. 9 It is a schematic diagram of the structure of the embodiment at the guide wheel.

[0039] Fig.10 2 is a positional relationship diagram of the limiting plate and the guide plate in the embodiment.

[0040] Description of the accompanying drawings: 1. base; 2. seat frame; 3. driving mechanism; 4. headrest rod group; 5. supporting foot group; 6. front cross bar; 7. rear cross bar; 8. slide rail; 9. sliding member; 10. driving cylinder; 11. force transmission rod; 12. plastic sliding sleeve; 13. supporting member; 14. mounting seat; 15. supporting wheel; 16. guide groove; 17. guide tube; 18. connecting seat; 19. supporting foot; 20. fixing part; 21. adjusting part; 22. roller; 23. mounting hole; 24. adjusting hole; 25. linkage Assembly; 26, first connecting rod; 27, second connecting rod; 28, extension rod; 29, mounting rod; 30, reset member; 31, stop rod; 32, bearing; 33, limit shaft; 34, headrest rod; 35, hinged plate; 36, guide wheel; 37, connecting rod; 38, guide plate; 39, guide groove; 40, vertical groove; 41, horizontal groove; 42, transition groove; 43, wheel body; 44, rotating shaft; 45, mounting bolt; 46, mounting nut; 47, limit plate; 48, linkage rod; 49, connecting member. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-10 This application is described in further detail.

[0042] The present application embodiment discloses a stretching device for a sofa recliner. Figure 1 and Figure 2An anti-dumping extension device for a sofa recliner comprises a base 1, a seat frame 2, a headrest rod group 4, a support leg group 5 and a driving mechanism 3. The seat frame 2 is used to install a seat cushion, and the headrest rod group 4 is used to install a pillow. The seat frame 2 is slidably connected to the base 1, and the driving mechanism 3 is used to drive the seat frame 2 to slide linearly on the base 1. The headrest rod group 4 and the support leg group 5 are rotatably connected to both ends of the seat frame 2 respectively. A linkage assembly 25 is provided between the support leg group 5 and the seat frame 2.

[0043] When the sofa is in a sitting position, the headrest rod group 4 is arranged in the vertical direction, and the supporting foot group 5 is folded under the seat frame 2. At this time, the user can sit on the cushion with his head resting on the pillow, and the user feels comfortable.

[0044] When the sofa needs to be changed from a sitting position to a chaise longue position, the driving mechanism 3 drives the seat frame 2 to move outward, and the linkage assembly 25 drives the supporting foot assembly 5 to rotate relative to the seat frame 2 and unfold to support the ground. The headrest rod assembly 4 rotates relative to the seat frame 2 to a tilting device or a horizontal state, which is a horizontal state in this embodiment. At this time, the user can lie on the sofa recliner with his head against the pillow and experience comfort.

[0045] When the sofa needs to be changed from a chaise longue lying position to a sitting position, the driving mechanism 3 drives the seat frame 2 to move inward, and the linkage assembly 25 drives the supporting foot group 5 to rotate and retract relative to the seat frame 2 to leave the ground and hide under the seat frame 2. The headrest rod group 4 rotates relative to the seat frame 2 to a vertical state to achieve reset.

[0046] Specifically, refer to Figure 1 The base 1 includes a front crossbar 6 and a rear crossbar 7. The front crossbar 6 is located on the outward side of the rear crossbar 7. When the seat frame 2 moves outward relative to the base 1, the seat frame 2 moves toward the front crossbar 6. A slide rail 8 is provided between the front crossbar 6 and the rear crossbar 7. The two ends of the slide rail 8 are respectively fixedly connected to the front crossbar 6 and the rear crossbar 7. There are two slide rails 8, one on each side of the seat frame 2. Figure 1 and Figure 3 , two sliding members 9 are slidingly sleeved on each slide rail 8. The sliding member 9 is installed on the seat frame 2 through a connecting seat 18, one slide rail 8 corresponds to one connecting seat 18, and all sliding members 9 corresponding to one slide rail 8 are installed on the same connecting seat 18.

[0047] Reference Figure 1 The driving mechanism 3 includes a driving cylinder 10 and a force transmission rod 11 fixedly mounted on the output end of the driving cylinder 10. The driving cylinder 10 can be a pneumatic cylinder, an electric cylinder, a sliding push rod, etc. The cylinder body of the driving cylinder 10 is parallel to the slide rail 8, and the two ends of the cylinder body of the driving cylinder 10 are respectively fixedly mounted on the front cross bar 6 and the rear cross bar 7. The two ends of the force transmission rod 11 are respectively fixedly connected to the upper end surfaces of the two connecting seats 18.

[0048] When the posture of the sofa recliner is adjusted, the output end of the driving cylinder 10 drives the connecting seat 18 to slide along the length direction of the slide rail 8, thereby giving thrust to both sides of the seat frame 2, so that the seat frame 2 can stably slide relative to the base 1 along the predetermined track.

[0049] Reference Figure 1 and Figure 3 In order to reduce the noise when the seat frame 2 slides relative to the base 1, a through hole for the slide rail 8 to pass through is provided on the slide member 9. A plastic slide sleeve 12 is installed in the through hole, and the plastic slide sleeve 12 is slidably sleeved outside the slide rail 8. After the plastic slide sleeve 12 is installed, the slide member 9 can slide relative to the slide rail 8 more smoothly with less noise, thereby improving the overall user experience of the sofa recliner.

[0050] Reference Figure 4 In order to keep the seat frame 2 stable in the sitting state, two support members 13 are fixedly installed at both ends of the front cross bar 6. The support member 13 includes a mounting seat 14 fixedly installed on the front cross bar 6 and a support wheel 15 rotatably connected to the mounting seat 14. The outer wall of the support wheel 15 is provided with an annular guide groove 16 along its circumference. The cross section of the guide groove 16 is U-shaped, V-shaped or trapezoidal, and is U-shaped in this embodiment. The side length of the cross section of the guide groove 16 facing the center of the support wheel 15 is smaller than the side length of the end away from the center of the support wheel 15. A guide tube 17 parallel to the slide rail 8 is fixedly installed on the lower end surface of the seat frame 2. Two guide tubes 17 are provided and are respectively located on both sides of the seat frame 2. One guide tube 17 corresponds to one support member 13. The guide tube 17 is embedded in the guide groove 16 and is slidably connected to the support wheel 15.

[0051] When the sofa is in a sitting position, the support member 13 and the sliding member 9 are respectively located at both ends of the seat frame 2, and both ends of the seat frame 2 are supported, so that it can be better maintained stable. When the seat frame 2 is slidably connected to the base 1, the guide tube 17 slides relative to the support wheel 15. The support wheel 15 has both a guiding force and a supporting force on the guide tube 17, so that the seat frame 2 can slide more stably along a predetermined track.

[0052] Reference Figure 2 The support foot assembly 5 includes two support feet 19, and the two support feet 19 are rotatably connected to both sides. The support foot 19 includes a fixed portion 20 rotatably connected to the seat frame 2, an adjusting portion 21 slidably connected to the fixed portion 20, and a roller 22 rotatably connected to the lower end of the adjusting portion 21. A locking member for fixing the adjusting portion 21 relative to the fixed portion 20 is provided between the fixed portion 20 and the adjusting portion 21. A linkage rod 48 is provided between the two fixed portions 20, and the two ends of the linkage rod 48 are fixedly installed on the two fixed portions 20 respectively.

[0053] According to the actual distance between the seat frame 2 and the ground, the adjusting portion 21 is slid relative to the fixing portion 20 until the roller 22 can stably abut against the ground when the supporting legs 19 are unfolded, ensuring that the supporting leg assembly 5 can support the seat frame 2 when the sofa is in a lying position.

[0054] Specifically, refer to Figure 5 , the fixing part 20 is provided with an adjustment hole 24, and a plurality of the adjustment holes 24 are provided along the length direction of the fixing part 20. The adjustment part 21 is provided with two mounting holes 23. Each mounting hole 23 corresponds to a locking member. The locking member includes a locking bolt and a locking nut. After the adjusting part 21 is slid to a suitable position relative to the fixing part 20, the locking bolt passes through the mounting hole 23 and the adjustment hole 24 in turn, and then the locking nut is threadedly connected to the locking bolt, and the fixing part 20 and the adjusting part 21 are clamped and fixed by the locking bolt and the locking nut, so that the length of the supporting foot 19 is maintained at the length after manual adjustment.

[0055] Reference Figure 2 , there are two linkage components 25, one supporting foot 19 corresponds to one linkage component 25. Figure 2 and Figure 5 The linkage assembly 25 includes a first connecting rod 26, a second connecting rod 27, an extension rod 28, a mounting rod 29 and a reset member 30. The mounting rod 29 is parallel to the length direction of the seat frame 2 and is fixedly mounted on the seat frame 2. The fixed portion 20 of the support foot 19 is rotatably connected to the outward end of the mounting rod 29. The first connecting rod 26 is rotatably connected to the inward end of the mounting rod 29. The second connecting rod 27 is rotatably connected to the middle of the fixed portion 20 and the middle of the first connecting rod 26. The mounting rod 29, the support foot 19, the first connecting rod 26 and the second connecting rod 27 form a four-bar structure. That is, when the first connecting rod 26 rotates relative to the seat frame 2, the support foot 19 can rotate relative to the seat frame 2.

[0056] Reference Figure 5 and Figure 6 The extension rod 28 is arranged along the length direction of the first connecting rod 26 and is fixedly connected to the end of the first connecting rod 26 away from the mounting rod 29. The extension rod 28 and the first connecting rod 26 are integrally arranged. A stop rod 31 is fixedly installed on the front cross bar 6, and a bearing 32 is rotatably sleeved on the stop rod 31. When the seat frame 2 moves outward to a certain distance relative to the base 1, the extension rod 28 abuts against the bearing 32 on the stop rod 31, so that the first connecting rod 26 rotates relative to the seat frame 2 as the seat frame 2 moves, thereby realizing the rotation and deployment of the support leg 19 relative to the seat frame 2.

[0057] Reference Figure 5 and Figure 7 In order to allow the support leg 19 to be unfolded to support the ground without being over-extended, a limit shaft 33 is fixed on the second connecting rod 27. When the driving mechanism 3 drives the seat frame 2 to move outward for a certain distance, the extension rod 28 abuts against the stop rod 31, and the driving mechanism 3 continues to drive the seat frame 2 to move outward until the seat frame 2 moves outward to the limit distance, and the support leg 19 just rotates to the position of supporting the ground. At this time, the support leg 19 abuts against the limit shaft 33 and cannot continue to rotate and unfold.

[0058] Reference Figure 5 and Figure 6 The reset member 30 is a spring, and the two ends of the reset member 30 are respectively mounted on the fixed portion 20 of the support leg 19 and the second connecting rod 27. The reset member 30 is used to keep the extension rod 28 in contact with the bearing 32 on the stop rod 31 during the retraction process of the support leg 19 when the seat frame 2 moves inward. Therefore, when the driving mechanism 3 drives the seat frame 2 to move inward, the bearing 32 has a guiding force on the extension rod 28, so that the first connecting rod 26 rotates relative to the seat frame 2, so as to realize the rotation and retraction of the support leg 19 relative to the seat frame 2.

[0059] Therefore, in the sitting position, the support leg group 5 is folded under the seat frame 2. When changing from the sitting position to the lying position, the seat frame 2 moves outward relative to the base 1, and the support leg group 5 rotates and unfolds to abut against the ground, thereby completing the support of the seat frame 2. In this process, the support leg 19 does not slide over a long distance with the ground, reducing the scratches on the ground by the support leg 19 when the sofa posture is adjusted. At the same time, no additional driving source is required, and the expansion and folding of the support leg 19 is achieved according to the movement of the seat frame 2 relative to the base 1, which saves costs.

[0060] Reference Figure 8 The headrest rod group 4 includes two headrest rods 34 and two hinged plates 35. The two headrest rods 34 are respectively located on both sides of the seat frame 2. One hinged plate 35 corresponds to one headrest rod 34. The hinged plate 35 is triangular, and the headrest rod 34 is fixedly installed on one side of the hinged plate 35. Figure 3 One end of the hinged plate 35 is rotatably connected to a guide wheel 36, and the guide wheel 36 is located at the angle corresponding to the side of the hinged plate 35 where the headrest rod 34 is installed. The other end of the hinged plate 35 is rotatably connected to a connecting rod 37, and the connecting rod 37 is parallel to the seat frame 2 and fixedly installed on the seat frame 2. The connection point between the hinged plate 35 and the connecting rod 37, the connection point between the hinged plate 35 and the guide wheel 36, and the connection point between the hinged plate 35 and the headrest rod 34 form a triangular support.

[0061] Reference Figure 8 , guide plates 38 are provided on both sides of the base 1, and one guide plate 38 corresponds to one headrest rod 34. A guide groove 39 is provided on the guide plate 38. The guide groove 39 includes a vertical groove 40 arranged in the vertical direction, a horizontal groove 41 arranged in the horizontal direction, and a transition groove 42. The horizontal groove 41 is located below the outward side of the vertical groove 40. The transition groove 42 is an arc groove, and the two ends of the transition groove 42 are respectively connected to the lower end of the vertical groove 40 and the end of the horizontal groove 41 close to the vertical groove 40, and the transition groove 42 is used for transition between the vertical groove 40 and the horizontal groove 41. The guide wheel 36 is embedded in the guide groove 39 and is slidably connected to the guide groove 39. The headrest rod 34, the guide wheel 36 and the guide plate 38 form a guide assembly.

[0062] In the sitting state, the headrest rod 34 is arranged in the vertical direction, and the pillow can support the human head. When changing from the sitting state to the lying state, the seat frame 2 moves outward relative to the base 1. The seat frame 2 transmits force through the connecting rod 37 and the hinged plate 35, so that the guide wheel 36 can slide along the guide groove 39, sliding from the vertical groove 40 to the horizontal groove 41, so that the headrest rod 34 can rotate relative to the seat frame 2, so that the headrest can change its angle as the sofa posture is adjusted, until the headrest rod 34 becomes horizontal. When the sofa is in a lying position, the pillow can support the human head. Therefore, the headrest can support the human head in both sitting and lying positions, improving the comfort and experience of use.

[0063] Reference Fig. 9 and Fig.10 In order to make the guide wheel 36 slide more stably along the guide groove 39, an annular groove is provided on the outer wall of the guide wheel 36, and the annular groove connects the outer peripheral wall and the inner peripheral wall of the guide wheel 36 to separate the guide wheel 36 into two wheel bodies 43. A rotating shaft 44 is installed on the hinge plate 35, and the rotating shaft 44 passes through the guide groove 39. The two wheel bodies 43 are both installed on the rotating shaft 44 and are rotatably connected to the rotating shaft 44. The two wheel bodies 43 are respectively located on both sides of the guide plate 38 and sandwich the guide plate 38. Therefore, the guide groove 39 can better guide the guide wheel 36, so that the headrest rod 34 can rotate along a predetermined track.

[0064] In order to facilitate the installation of the guide wheel 36 on the hinge plate 35 and the guide plate 38, the rotating shaft 44 includes a mounting bolt 45 and a mounting nut 46. The mounting bolt 45 includes a force-applying part, a polished rod section and a threaded section that are coaxially fixedly connected in sequence. The force-applying part is provided with a hexagonal groove, a straight groove or a cross groove, and a hexagonal groove is used in this embodiment. The wheel body 43 is sleeved on the polished rod section and rotatably connected to the polished rod section. The threaded section passes through the hinge plate 35, and the mounting nut 46 is threadedly connected to one end of the threaded section passing through the hinge plate 35.

[0065] During installation, first place the two wheel bodies 43 on both sides of the guide plate 38, then pass the mounting bolts 45 through one of the wheel bodies 43, the guide groove 39, the other wheel body 43, and the hinge plate 35 in sequence, and finally tighten the mounting nut 46 on one end of the mounting bolt 45, so that the guide wheel 36 can be easily installed on the hinge plate 35 and the guide plate 38.

[0066] Reference Fig.10 In order to protect the guide wheel 36, a limiting plate 47 is provided on the side of the guide plate 38 away from the base 1, and the limiting plate 47 is spaced apart from the guide plate 38. The limiting plate 47 is fixedly mounted on the guide plate 38 through a connecting member 49, and the connecting member 49 is shaft-shaped. The connecting member 49 is spaced apart along the outer periphery of the guide plate 38. The limiting plate 47 blocks the guide wheel 36 from moving away from the side of the hinge plate 35.

[0067] The implementation principle of a stretching device for a sofa recliner in the embodiment of the present application is as follows:

[0068] When sitting, refer to Figure 1 , the headrest rod 34 is in a vertical state, the seat frame 2 is located directly above the base 1, and the supporting feet 19 are in a folded state.

[0069] When the sofa recliner needs to change from a sitting position to a lying position, that is, the sofa recliner changes from Figure 1 Convert Figure 2 When the seat frame 2 moves outward, the driving mechanism 3 drives the seat frame 2 to move outward. At this time, the headrest rod 34 rotates relative to the seat frame 2 driven by the seat frame 2 until it rotates to a horizontal state, which can be used to support the head of a person in a lying position. After the seat frame 2 moves outward for a certain distance, the support foot 19 can rotate relative to the seat frame 2 as the seat frame 2 moves outward because the first connecting rod 26 abuts against the bearing 32 on the stop rod 31, until the seat frame 2 moves to the extreme position, at which time the roller 22 of the support foot 19 just abuts against the ground for support. The support foot 19 can provide support to the seat frame 2, so that the seat frame 2 remains stable even in a lying position.

[0070] When the sofa recliner needs to change from a lying position to a sitting position, that is, the sofa recliner changes from Figure 2 Transfer back Figure 1 When the seat frame 2 is moved inward by the driving mechanism 3, the headrest rod 34 rotates relative to the seat frame 2 until it rotates to a vertical state under the drive of the seat frame 2, and can be used to support the head of a person when sitting. The extension rod 28 abuts against the bearing 32 of the stop rod 31 under the action of the reset member 30, and the bearing 32 has a guiding force on the extension rod 28, so that the first connecting rod 26 rotates relative to the seat frame 2, so as to realize the rotation and retraction of the support foot 19 relative to the seat frame 2.

[0071] 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. An anti-dumping extension device for a sofa recliner, Features: The sofa comprises a base (1), a seat frame (2) slidably connected to the base (1) and used for mounting a seat cushion, a driving mechanism (3) used for driving the seat frame (2) to slide relative to the base (1), a supporting foot (19) mounted at one end of the seat frame (2), and a linkage component (25) mounted on the seat frame (2), wherein the linkage component (25) is used for transmitting the motion pair of the seat frame (2) to the supporting foot (19); when the driving mechanism (3) drives the seat frame (2) to move outwards so that the sofa changes from a sitting position to a chaise-length position, the linkage component (25) drives the supporting foot (19) to expand relative to the seat frame (2) to support the ground; when the driving mechanism (3) drives the seat frame (2) to move inwards so that the sofa changes from a chaise-length position to a sitting position, the linkage component (25) drives the supporting foot (19) to retract relative to the seat frame (2) to leave the ground; The support foot (19) is rotatably connected to the seat frame (2), and the linkage assembly (25) is used to convert the linear motion pair of the seat frame (2) into a rotation pair and then transmit it to the support foot (19); The base (1) is provided with a stop rod (31), and the linkage assembly (25) comprises a first connecting rod (26) rotatably connected to the seat frame (2), a second connecting rod (27) rotatably connected to the first connecting rod (26), an extension rod (28) fixedly connected to the first connecting rod (26), and a reset member (30), wherein the second connecting rod (27) is rotatably connected to the supporting foot (19) at one end away from the first connecting rod (26), and the seat frame (2), the supporting foot (19), the first connecting rod (26) and the second connecting rod (27) form a four-link structure; when the seat frame (2) moves outward, the extension rod (28) abuts against the stop rod (31) so that the first connecting rod (26) rotates relative to the seat frame (2) as the seat frame (2) moves; and the reset member (30) is used to keep the extension rod (28) in a state of abutting against the stop rod (31) during the process of retracting the supporting foot (19) when the seat frame (2) moves inward. Two supporting legs (19) are provided and are respectively located on both sides of the seat frame (2); two linkage components (25) are provided, and one linkage component (25) corresponds to one supporting leg (19).

2. The anti-tilt extension device for a sofa recliner according to claim 1, Features: The stop rod (31) is located on the outward side of the extension rod (28); when the driving mechanism (3) drives the seat frame (2) to move outward for a certain distance, the extension rod (28) abuts against the stop rod (31), and the driving mechanism (3) continues to drive the seat frame (2) to move outward until the seat frame (2) moves outward to a limit distance, and the support foot (19) just rotates to a position supporting the ground.

3. The anti-dumping extension device for a sofa recliner according to claim 1, Features: The outer shell of the blocking rod (31) is provided with a bearing (32), the bearing (32) is rotatably connected to the blocking rod (31), and the bearing (32) is used to abut against the extension rod (28).

4. The anti-dumping extension device for a sofa recliner according to claim 1, Features: The second connecting rod (27) is provided with a limiting shaft (33); when the supporting foot (19) rotates to a position supported on the ground, the limiting shaft (33) abuts against the supporting foot (19).

5. The anti-dumping extension device for a sofa recliner according to claim 1, Features: A linkage rod (48) is provided between the two supporting legs (19), and two ends of the linkage rod (48) are respectively fixedly mounted on the two supporting legs (19).

6. The anti-dumping extension device for a sofa recliner according to claim 1, Features: The supporting foot (19) comprises a fixing portion (20) connected to the seat frame (2) and an adjusting portion (21) slidably connected to the fixing portion (20), and a locking member for locking the adjusting portion (21) relative to the fixing portion (20) is provided between the fixing portion (20) and the adjusting portion (21).

7. The anti-dumping extension device for a sofa recliner according to claim 1, Features: A roller (22) is installed at the lower end of the support foot (19), and the roller (22) is rotatably connected to the support foot (19). The support foot (19) is supported on the ground through the roller (22).

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