Structurally improved manual sofa stretching device

Abstract

A structurally improved manual sofa stretching device includes a base. A functional frame is arranged on the base. The functional frame includes a leg structure, a seat structure and a back structure. The leg structure is connected to the seat structure, and the seat structure is connected to the back structure. The seat structure includes a mounting side plate, and the mounting side plate is arranged on the base. The leg structure includes a third foot rod, a fourth foot rod, a first extension link rod, a second extension link rod, a third extension link rod, a fourth extension link rod, a first Z-shaped linkage rod, a second Z-shaped linkage rod, a first footrest, a second footrest and a small footrest.

Claims

1. A structurally improved manual sofa stretching device, comprising a base; wherein a functional frame is arranged on the base; the functional frame comprises a leg structure, a seat structure and a back structure; the leg structure is connected to the seat structure, and the seat structure is connected to the back structure; the seat structure comprises a mounting side plate, and the mounting side plate is arranged on the base; the leg structure comprises a third foot rod, a fourth foot rod, a first extension link rod, a second extension link rod, a third extension link rod, a fourth extension link rod, a first Z-shaped linkage rod, a second Z-shaped linkage rod, a first footrest, a second footrest and a small footrest; a first end of the first extension link rod is rotatably connected to a middle of the second footrest; a second end of the first extension link rod is rotatably connected to a first end of the fourth foot rod; a second end of the fourth foot rod is rotatably connected to a first end of the mounting side plate; a first end of the second extension link rod is rotatably connected to a second end of the first footrest; a second end of the second extension link rod is rotatably connected to a first end of the third foot rod; a second end of the third foot rod is rotatably connected to the first end of the mounting side plate; a first end of the third extension link rod is rotatably connected to a second end of the fourth extension link rod; a second end of the third extension link rod is rotatably connected to a middle of the first extension link rod; a first end of the fourth extension link rod is rotatably connected to a middle of the first footrest; a first end of the first footrest is provided with a first mounting hole; a first end of the first Z-shaped linkage rod is rotatably connected to one a first end of the second footrest; a second end of the first Z-shaped linkage rod is rotatably connected to a middle of the third extension link rod; a second end of the second footrest is provided with a second mounting hole; a first end of the second Z-shaped linkage rod is rotatably connected to the middle of the third extension link rod; a second end of the second Z-shaped linkage rod is rotatably connected to a first end of the small footrest; a middle of the small footrest is rotatably connected to a middle of the second extension link rod; a second end of the small footrest is provided with a third mounting hole; the middle of the second extension link rod is further provided with a protruding limit part, and the protruding limit part abuts against a middle of the second Z-shaped linkage rod; the back structure comprises a backrest member; the backrest member is rotatably connected to a second end of the mounting side plate; a limit assembly is arranged on the base, and the limit assembly is configured to limit a position of the backrest member.

2. The structurally improved manual sofa stretching device according to claim 1, wherein the seat structure further comprises a front support member, a rear support member, a front linkage member, an intermediate linkage member, a rear linkage member, a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod; a first end of the first connecting rod is rotatably connected to the backrest member; a second end of the first connecting rod is rotatably connected to a first end of the intermediate linkage member; a second end of the intermediate linkage member is rotatably connected to a first end of the rear support member; a second end of the rear support member is rotatably connected to a second end of the base; a middle of the intermediate linkage member is rotatably connected to a first end of the third connecting rod; a second end of the third connecting rod is rotatably connected to a middle of the front linkage member; a first end of the front linkage member is rotatably connected to a first end of the front support member; a second end of the front support member is rotatably connected to a first end of the base; a second end of the front linkage member is rotatably connected to a middle of the mounting side plate; a middle of the rear linkage member is rotatably connected to the middle of the mounting side plate; a first end of the rear linkage member is rotatably connected to a first end of the second connecting rod; a second end of the second connecting rod is rotatably connected to a middle of the front support member; a second end of the rear linkage member is rotatably connected to a first end of the fourth connecting rod; and a second end of the fourth connecting rod is rotatably connected to a middle of the fourth foot rod.

3. The structurally improved manual sofa stretching device according to claim 1, wherein the limit assembly comprises a limit bushing; the second end of the mounting side plate is provided with a guide slot; the limit bushing is connected to the backrest member through a rotating shaft, and the limit bushing abuts against a side of the guide slot.

4. The structurally improved manual sofa stretching device according to claim 2, wherein the front linkage member is crescent-shaped, and the middle of the front linkage member is provided with a riveting hole and a spare hole.

5. The structurally improved manual sofa stretching device according to claim 2, wherein a first spring is further connected between the third connecting rod and the base through a first mounting assembly, and the first spring is configured to assist in unfolding the leg structure; the first mounting assembly comprises a first spring peg and a second spring peg; a middle of the third connecting rod is provided with a first positioning hole; the first end of the base is provided with a second positioning hole; a first end of the first spring peg is inserted into the first positioning hole, and a second end of the first spring peg is connected to a first end of the first spring; and a first end of the second spring peg is inserted into the second positioning hole, and a second end of the second spring peg is connected to a second end of the first spring.

6. The structurally improved manual sofa stretching device according to claim 2, wherein a second spring is further connected between the intermediate linkage member and the base through a second mounting assembly, and the second spring is configured to assist in retracting the back structure; the second mounting assembly comprises a third spring peg; the first end of the intermediate linkage member is provided with a third positioning hole; the middle of the mounting side plate is provided with a fourth positioning hole, and the fourth positioning hole is strip-shaped; a first end of the third spring peg is inserted into the third positioning hole; a second end of the third spring peg is connected to a first end of the second spring; and a second end of the second spring is hooked in the fourth positioning hole.

7. The structurally improved manual sofa stretching device according to claim 3, wherein an end of the guide slot is provided with an arc-shaped transition portion.

8. The structurally improved manual sofa stretching device according to claim 3, wherein the limit bushing is made of metal.

9. The structurally improved manual sofa stretching device according to claim 3, wherein the limit bushing is made of stainless steel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic plan view of the present invention.

(2) FIG. 2 is a schematic view of the three-dimensional structure of a leg structure of the present invention.

(3) FIG. 3 is a schematic plan view of the leg structure of the present invention.

(4) FIG. 4 is a schematic view of the three-dimensional structure of the present invention with a part of the leg structure removed.

(5) FIG. 5 is a partial enlarged view of the portion A encircled in FIG. 4.

(6) FIG. 6 is a partial enlarged view of the portion B encircled in FIG. 4.

(7) FIG. 7 is a schematic view of the three-dimensional structure of the front linkage member of the present invention.

(8) In the figures: 1, base; 2, rear support member; 3, first connecting rod; 4, rotating shaft; 5, backrest member; 6, limit bushing; 7, third foot rod; 8, first extension link rod; 9, second extension link rod; 10, first Z-shaped linkage rod; 11, fourth foot rod; 12, mounting side plate; 12a, fourth positioning hole; 12b, guide slot; 13, front linkage member; 13a, riveting hole; 13b, spare hole; 14, front support member; 15, fourth connecting rod; 16, rear linkage member; 17, second spring; 18, intermediate linkage member; 19, third spring peg; 20, first spring peg; 21, third connecting rod; 22, second connecting rod; 23, first spring; 24, second spring peg; 25, small footrest; 26, second footrest; 27, first footrest; 28, fourth extension link rod; 29, third extension link rod; and 30, second Z-shaped linkage rod.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(9) Hereinafter, the technical solutions of the present invention will be further described with reference to the specific embodiments and drawings of the present invention, but the present invention is not limited to these embodiments.

(10) As shown in FIGS. 1-7, a structurally improved manual sofa stretching device includes the base 1. A functional frame is arranged on the base 1. The functional frame includes a leg structure, a seat structure and a back structure. The leg structure is connected to the seat structure, and the seat structure is connected to the back structure. The seat structure includes the mounting side plate 12, and the mounting side plate 12 is arranged on the base 1. The leg structure includes the third foot rod 7, the fourth foot rod 11, the first extension link rod 8, the second extension link rod 9, the third extension link rod 29, the fourth extension link rod 28, the first Z-shaped linkage rod 10, the second Z-shaped linkage rod 30, the first footrest 27, the second footrest 26 and the small footrest 25. One end of the first extension link rod 8 is rotatably connected to the middle of the second footrest 26. The other end of the first extension link rod 8 is rotatably connected to one end of the fourth foot rod 11. The other end of the fourth foot rod 11 is rotatably connected to one end of the mounting side plate 12. One end of the second extension link rod 9 is rotatably connected to the other end of the first footrest 27. The other end of the second extension link rod 9 is rotatably connected to one end of the third foot rod 7. The other end of the third foot rod 7 is rotatably connected to one end of the mounting side plate 12. One end of the third extension link rod 29 is rotatably connected to the other end of the fourth extension link rod 28. The other end of the third extension link rod 29 is rotatably connected to the middle of the first extension link rod 8. One end of the fourth extension link rod 28 is rotatably connected to the middle of the first footrest 27. One end of the first footrest 27 is provided with a first mounting hole. One end of the first Z-shaped linkage rod 10 is rotatably connected to one end of the second footrest 26. The other end of the first Z-shaped linkage rod 10 is rotatably connected to the middle of the third extension link rod 29. The other end of the second footrest 26 is provided with a second mounting hole. One end of the second Z-shaped linkage rod 30 is rotatably connected to the middle of the third extension link rod 29. The other end of the second Z-shaped linkage rod 30 is rotatably connected to one end of the small footrest 25. The middle of the small footrest 25 is rotatably connected to the middle of the second extension link rod 9. The other end of the small footrest 25 is provided with a third mounting hole. The middle of the second extension link rod 9 is further provided with a protruding limit part, and the limit part abuts against the middle of the second Z-shaped linkage rod 30. In this arrangement, when the sofa is switched between the sitting posture mode, the TV-watching posture mode and the lying posture mode, it is necessary to frequently unfold or fold the leg structure. In this regard, instead of traditionally designing a sliding slot at the footrest of the leg structure, the link rods and linkage rods, which are not prone to wear after long-term use, are employed so that the leg structure can be unfolded or folded more smoothly, thereby greatly improving the service life and providing good stability during use.

(11) The back structure includes the backrest member 5. The backrest member 5 is rotatably connected to the other end of the mounting side plate 12. The seat structure further includes the front support member 14, the rear support member 2, the front linkage member 13, the intermediate linkage member 18, the rear linkage member 16, the first connecting rod 3, the second connecting rod 22, the third connecting rod 21 and the fourth connecting rod 15. One end of the first connecting rod 3 is rotatably connected to the backrest member 5. The other end of the first connecting rod 3 is rotatably connected to one end of the intermediate linkage member 18. The other end of the intermediate linkage member 18 is rotatably connected to one end of the rear support member 2. The other end of the rear support member 2 is rotatably connected to the other end of the base 1. The middle of the intermediate linkage member 18 is rotatably connected to one end of the third connecting rod 21. The other end of the third connecting rod 21 is rotatably connected to the middle of the front linkage member 13. One end of the front linkage member 13 is rotatably connected to one end of the front support member 14. The other end of the front support member 14 is rotatably connected to one end of the base 1. The other end of the front linkage member 13 is rotatably connected to the middle of the mounting side plate 12. The middle of the rear linkage member 16 is rotatably connected to the middle of the mounting side plate 12. One end of the rear linkage member 16 is rotatably connected to one end of the second connecting rod 22. The other end of the second connecting rod 22 is rotatably connected to the middle of the front support member 14. The other end of the rear linkage member 16 is rotatably connected to one end of the fourth connecting rod 15. The other end of the fourth connecting rod 15 is rotatably connected to the middle of the fourth foot rod 11. A limit assembly is arranged on the base 1, and is configured to limit the position of the backrest member 5. The first spring 23 is further connected between the third connecting rod 21 and the base 1 through a first mounting assembly, and is configured to assist in unfolding the leg structure. The second spring 17 is further connected between the intermediate linkage member 18 and the base 1 through a second mounting assembly, and is configured to assist in retracting the back structure. In this arrangement, when the sitting posture mode is switched to the TV-watching posture mode, the elastic action of the first spring 23 can assist in unfolding the leg structure. When the lying position mode is switched to the TV-watching posture mode, the elastic force of the second spring 17 can assist in retracting the backrest member 5, thereby providing a 162° flat-lying mode, which has a satisfactory effect during use.

(12) The front linkage member 13 is crescent-shaped, and the middle of the front linkage member 13 is provided with the riveting hole 13a and the spare hole 13b. In this arrangement, since the acting force of the backrest member becomes excessively small when the TV-watching posture mode is switched to the lying posture mode, the riveting hole 13a of the front linkage member 13 is adjusted to tighten the backrest member, while the original spare hole 13b is reserved so that the riveting hole 13a and the spare hole 13b can be switched to each other to meet different needs of users.

(13) The limit assembly includes the limit bushing 6. The other end of the mounting side plate 12 is provided with the guide slot 12b. The limit bushing 6 is connected to the backrest member 5 through the rotating shaft 4, and the limit bushing 6 abuts against a side of the guide slot 12b. In this arrangement, when the TV-watching posture mode is switched to the lying posture mode, the limit bushing 6 abuts against the side of the guide slot 12b to effectively limit the position of the backrest member 5, instead of traditionally using connecting plates and limit columns to limit the position of the backrest member 5.

(14) Further, the end of the guide slot 12b is provided with an arc-shaped transition portion. In this arrangement, the limit bushing 6 can be smoothly engaged into the guide slot 12b through the transition portion.

(15) The limit bushing 6 is made of metal, so that the service life of the limit bushing 6 is greatly prolonged. Optionally, the limit bushing 6 may also be made of stainless steel according to actual needs.

(16) The first mounting assembly includes the first spring peg 20 and the second spring peg 24. The middle of the third connecting rod 21 is provided with a first positioning hole. One end of the base 1 is provided with a second positioning hole. One end of the first spring peg 20 is inserted into the first positioning hole, and the other end of the first spring peg 20 is connected to one end of the first spring 23. One end of the second spring peg 24 is inserted into the second positioning hole, and the other end of the second spring peg 24 is connected to the other end of the first spring 23. The second mounting assembly includes the third spring peg 19. One end of the intermediate linkage member 18 is provided with a third positioning hole. The middle of the mounting side plate 12 is provided with the fourth positioning hole 12a, and the fourth positioning hole 12a is strip-shaped. One end of the third spring peg 19 is inserted into the third positioning hole. The other end of the third spring peg 19 is connected to one end of the second spring 17. The other end of the second spring 17 is hooked in the fourth positioning hole 12a.

(17) In the present embodiment, each rotatable connection is realized by a rivet connection in the prior art.

(18) The specific embodiments described herein are merely exemplified to illustrate the spirit of the present invention. Those skilled in the art can make various modifications or supplements to the specific embodiments described in the present invention or make substitutions to the present invention in a similar way without deviating from the spirit of the present invention, and these modifications, supplements and substitutions shall fall within the scope defined by the appended claims.