COMPACT SOFA FRAME STRUCTURE

Abstract

The present application relates to the technical field of sofa, and in particular to a compact sofa frame structure, including a base frame and a slidable frame. The base frame is provided with an adjusting assembly. The adjusting assembly includes a driving rod and a driven rod; in which the driving rod and the driven rod are both rotatably connected at one end thereof on the base frame and rotatably connected to the backrest at the other end thereof; a linkage rod rotatably connected on the driving rod; the frame is provided with a driving assembly configured to drive a leg rest rotatably connected on the slidable frame to rotate; the slidable frame is provided with a fixing rod configured to limit the leg rest.

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of PCT application serial no. PCT/CN2022/136401, filed on Dec. 3, 2022, which claims the priority and benefit of Chinese patent application no. 202211011098.1, filed on Aug. 23, 2022. The entireties of PCT application serial no. PCT/CN2022/136401 and Chinese patent application no. 202211011098.1 are hereby incorporated by reference herein and made a part of this specification.

TECHNICAL FIELD

The present application relates to the technical field of sofa, and particularly to a compact sofa frame structure.

BACKGROUND

Sofa literally means a back rest chair provided with cushion such as spring or thick foamed plastic, which is a common furniture in the furniture and office field and very common in life.

Traditional sofa includes base frame, backrest, cushion and leg rest, in which the connecting mechanisms between the backrest and the cushion are revolve pair or revolute pair. When the backrest angle is adjusted, the back of human body will move relative to the backrest as the angle between the backrest and the cushion changes, which will generate a strong “rubbing feel” on the back, because of the long distance between the rotation point of the connecting mechanism and the rotation point of the human body. Besides, the leg rest is movably connected with the base frame and the cushion, so the motion of the leg rest depends on the movement of the cushion, which causes the inability of independent adjustment to the leg rest, such that people's comfort when using sofa is reduced.

SUMMARY

To improve people's comfort of using sofa, the present application provides a compact sofa frame structure.

The compact sofa frame structure provided in the present application adopts the following technical solution:

• • a compact sofa frame structure, including a base frame, a slidable frame slidably connected on the base frame and connected to a cushion, in which the base frame is provided with an adjusting assembly configured to adjust an angle of a backrest, the adjusting assembly includes:
  • a driving rod and a driven rod, in which the driving rod and the driven rod are both rotatably connected at one end thereof on the base frame and rotatably connected to the backrest at the other end thereof; and
  • a linkage rod, in which the linkage rod is rotatably connected on the driving rod and slidably connected to the slidable frame;
  • the base frame is provided with a driving assembly configured to drive a leg rest rotatably connected on the slidable frame to rotate, and the slidable frame is provided with a fixing rod configured to limit the leg rest and prevent a continuous rotation of the leg rest when the leg rest rotates outside.

By adopting above technical solution, when the leg rest needs to be used individually, the driving assembly is started and drives the leg rest to rotate outside of the sofa for supporting a leg, and the leg rest abuts against the fixing rod for limiting, so that the leg rest cannot continue to rotate. When the leg rest needs to be retracted, the driving assembly is started and drives the leg rest to rotate back for retracting the leg rest, therefore the leg rest can be used individually. When the position of the cushion and the backrest needs to be adjusted, the driving assembly drives the leg rest to rotate out for use, and continues to drive the leg rest to move; the leg rest pushes the slidable frame to move together with the leg rest under an action of the fixing rod; the slidable frame moves and drives the driving rod to rotate via the linkage rod; and the driving rod drives the backrest and the driven rod to rotate together and move simultaneously with the cushion, so that the “rubbing feel” on the back from the backrest is reduced, even no “rubbing feel” on the back is achieved, which improves people's comfort when using sofa.

When the backrest needs to be rotated back to its original position, the driving assembly is started and drives the leg rest to retract by rotation, then the driving assembly continues to drive the leg rest to drag the slidable frame to its original position. Therefore, use of a single driving assembly is able to drive the leg rest to rotate individually or drive the leg rest and the backrest to rotate simultaneously, so as to make the sofa structure more compact, and reduce the consumption of energies and consumables for multiple driving assemblies, which realize the energy conservation, environmental protection and reduction of sofa production costs.

In some embodiments, the base frame is provided with a limiting assembly configured for limiting the leg rest when the leg rest is rotated to the inner side of the sofa, wherein the limiting assembly includes:

• • a limiting electric push rod, wherein the limiting electric push rod is provided on the slidable frame;
  • a limiting block, wherein the limiting block is slidably connected on the slidable frame and connected to a piston rod of the limiting electric push rod; and the limiting block is configured to abuts against the leg rest to prevent a rotation of the leg rest when the leg rest retracts into the sofa by rotation, so that the driving assembly is able to drive the slidable frame to move individually.

By adopting above technical solution, when the leg rest needs to be used individually, the limiting electric push rod is started and drives the limiting block away from the leg rest, so the leg rest is able to automatically rotate and then contact the fixing rod. When the cushion needs to be moved individually, the leg rest retracts to the inner side of the sofa by rotation, and the limiting electric push rod is started and drives the limiting block close to the leg rest, so as to make the limiting block abut against the leg rest for locating. Therefore, the leg rest and the slidable frame are able to be pushed to move simultaneously when the driving assembly is started, so as to realize that the cushion can be moved individually without rotating the leg rest out, which further improves people's comfort when using sofa.

Besides, the limiting block abuts against the leg rest for locating, thereby reducing the tensile force to the limiting electric push rod by the leg rest. Therefore, the service life of the limiting electric push rod is improved, meanwhile, the probability of leg rest falling down is reduce, and the comfort when people use the sofa is improved.

In some embodiments, the driving assembly includes:

• • a first electric push rod, in particular, the first electric push rod is rotatably connected on the base frame and rotatably connected to the slidable frame; and
  • a second electric push rod, in particular, the second electric push rod is rotatably connected on the slidable frame and rotatably connected to the leg rest.

By adopting above technical solution, the slidable frame or the leg rest are individually pushed to move via the first electric push rod and the second electric push rod, therefore an adjustment can be made according to people's requirement, which improves people's comfort when using sofa.

In some embodiments, the base frame is provided with a support mechanism configured to support the leg rest, in particular, the leg rest is flush with an upper surface of the cushion when the leg rest is in use, and is in a vertical state when the leg rest retracts; the support mechanism includes:

• • a support plate, in particular, the support plate is provided on the leg rest;
  • a first rotatable plate and a second rotatable plate, in particular, the first rotatable plate and the second rotatable plate are both rotatably connected on the slidable frame;
  • a third rotatable plate, in particular, the third rotatable plate is rotatably connected on the second rotatable plate and rotatably connected to the support plate;
  • a fourth rotatable plate, in particular, the fourth rotatable plate is rotatably connected on the first rotatable plate at an end away from the slidable frame and rotatably connected to the support plate; and
  • a support rod, in particular, the support rod is provided on the first rotatable plate, and the driving assembly is connected to the support rod.

By adopting above technical solution, the driving assembly is started and drives the support rod and the first rotatable plate to rotate, and the second rotatable plate, the third rotatable plate, the fourth rotatable plate and the support plate are driven to rotate by the rotation of the first rotatable plate simultaneously, so that the support plate and the leg rest can rotate from the inner side of the sofa to the outside of the sofa for use, and the leg rest is rotated from a vertical state to a state being flush with the upper surface of the cushion, which realizes the support to the human leg. In addition, the leg rest is in vertical state when it retracts, therefore the leg rest can also protect the inner structure of the sofa.

In some embodiments, the support plate is provided with an expanding plate via a connecting assembly, in particular, the expanding plate is able be rotated to a side of the leg rest away from the sofa and cooperate with the leg rest to support a leg when the leg rest is rotated outside of the sofa for use, and the expanding plate is configured to rotate to a side of the leg rest close to the sofa when the leg rest retracts, in particular, the connecting assembly includes:

• • a first connecting plate, in particular, the first connecting plate is rotatably connected on the support plate; and
  • a second connecting plate, in particular, the second connecting plate is rotatably connected at two ends thereof to the first connecting plate and the fourth rotatable plate, respectively.

By adopting above technical solution, the fourth rotatable plate rotates to drive the support plate to rotate, and the support plate and the fourth rotatable plate rotate to drive the first connecting plate and the second connecting plate to rotate, so as to drive the expanding plate to rotate, which makes the expanding plate rotate outside of the sofa and cooperate with the leg rest to support a leg. As the space under the sofa is limited, the size of the leg rest is also limited. However, the expanding plate cooperates with the leg rest to support the leg, then the area for supporting the leg is increased, which improves a support effect to the leg and further improves people's comfort when using sofa. Besides, the expanding plate moves with the leg rest, which improves a motion consistency between the expanding plate and the leg rest, and further improves people's comfort when using sofa.

In some embodiments, the slidable frame is provided with a telescoping assembly configured to drive the cushion to extend, in particular, the telescoping assembly includes:

• • an extension plate, in particular, the extension plate is slidably connected on the slidable frame and connected to the cushion;
  • a motor for telescopic movement, in particular, the motor for telescopic movement is provided on the slidable frame; and
  • a telescoping screw rod, in particular, the telescoping screw rod is rotatably connected on the slidable frame, connected to an output shaft of the motor for telescopic movement and in thread connection with the extension plate.

By adopting above technical solution, the motor for telescopic movement is started and drives the telescoping screw rod to rotate; the telescoping screw rod rotates to drive the extension plate to move; and the extension plate moves to drive the cushion to move, so as to realize the partial extension or retraction to the original position of the cushion. Therefore, the size of the cushion can be adjusted due to a scalability of the cushion, then a human leg can be supported without adjusting the position of the leg rest when the human leg needs to be locally supported, thereby further improving people's comfort when using sofa.

In some embodiments, the driving rod is rotatably provided with a fixing-connecting plate rotatably connected to the driven rod and configured to be fixed with the backrest.

By adopting above technical solution, the driving rod and the driven rod are connected with each other to rotate together by the fixing-connecting plate, therefore the stability is improved when the driving rod and the driven rod drive the backrest to rotate, which improves people's comfort when using sofa. Besides, a point connection between the backrest and both of the driving rod and the driven rod is replaced by a face contact, therefore the service life of the backrest is improved.

In some embodiments, the driving rod is rotatably connected to the base frame via a rotatable assembly, in particular, the rotatable assembly includes:

• • a step bolt, in particular, the step bolt passes through the base frame and is in thread connection with the driving rod; and
  • a rotary bushing, in particular, the rotary bushing is in snap connection with the base frame via a snap-in groove and rotatably connected to the base frame; the step bolt passes through the rotary bushing and is in thread connection with the driving rod, so that the step bolt and the driving rod abut against the rotary bushing.

By adopting above technical solution, the rotary bushing is in snap connection with the base frame, and the rotary bushing is able to rotate on the base frame, then the step bolt passes through the rotary bushing and is in thread connection with the driving rod, so that the driving rod is rotatably installed on the base frame, and can be detached by a reverse operation, which improves the convenience and stability of installing the driving rod on the base frame.

In some embodiments, the slidable frame is provided with a seat spring mechanism configured to support the cushion.

By adopting above technical solution, the seat spring mechanism supports the cushion, so the stability of the cushion and people's comfort when using sofa are both improved.

In some embodiments, the seat spring mechanism includes:

• • a plurality of seat spring assemblies, in particular, the plurality of seat spring assemblies are provided at a first end thereof with a plurality of hooks configured to be hanged on the slidable frame, and the plurality of seat spring assemblies are detachably connected at a second ends thereof to the slidable frame via the fixing assembly; and
  • a connecting cross plate, in particular, the connecting cross plate is provided on the plurality of seat spring assemblies and configured to connect the plurality of seat spring assemblies together.

By adopting above technical solution, the connecting cross plate connects the plurality of seat spring assemblies together, then the plurality of seat spring assemblies is fixed at one end thereof with the slidable frame via the fixing assembly, and the hooks are hanged on the slidable frame, which realizes the mounting of the seat spring mechanism on the slidable frame. Meanwhile, the plurality of the connecting cross plates fixedly connect the plurality of seat spring assemblies together, so as to improve the convenience of mounting, and balance the distance between two adjacent seat spring assemblies. Therefore, the support effect from the seat spring assemblies to the seat spring is improved, and people's comfort when using sofa is improved.

In some embodiments, the fixing assembly includes:

• • a fixing plate, in particular, the fixing plate is provided on the slidable frame, and each of the plurality of seat spring assemblies is placed on the fixing plate; and
  • an elastic pressing plate, in particular, the elastic pressing plate is provided on the fixing plate and abuts against each of the plurality of the seat spring assemblies for locating.

By adopting above technical solution, the seat spring assembly is placed on the fixing plate, so that the seat spring assembly abuts against the elastic pressing plate. The hook is dragged to hang on the slidable frame, and the seat spring assembly is snapped between the elastic pressing plate and the fixing plate. Therefore the elastic pressing plate abuts against the seat spring assembly for locating, so that the fixing and replacement of the seat spring assembly is realized.

In some embodiments, a first locating sleeve and a second locating sleeve made of plastic material are provided on the hook and on each of the plurality of seat spring assemblies at an end away from the hook; the first locating sleeve and the second locating sleeve abut against the slidable frame and the fixing plate, respectively, and a plurality of the first locating sleeves are fixedly connected together via a fixing cross plate.

By adopting above technical solution, the first locating sleeve and the second locating sleeve abut against the slidable frame and the fixing plate, respectively, so as to reduce the probability of noise after contacting with hard materials. Moreover, the plurality of the first locating sleeves are fixedly connected together by the fixing cross plate, so as to improve the stability of the seat spring assembly and the cushion after mounting, thereby improving people's comfort when using sofa.

In some embodiments, the seat spring mechanism includes a plurality of tension springs and a plurality of drag hooks provided on the plurality of the tension springs, in particular, the drag hook are configured to be hanged on the slidable frame for locating.

By adopting above technical solution, the drag hooks of the plurality of tension springs are configured to be hanged on the slidable frame, so the support of the plurality of the tension springs to the cushion is realized. Moreover, the production cost of the whole tension spring is low, then the cost is saved while meeting people's comfort.

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

• • the leg rest is drove to rotate outside of the sofa for supporting the leg by starting the driving assembly. When the position of the cushion and backrest needs to be adjusted, the driving assembly continues to drive the leg rest to move; the leg rest pushes the slidable frame and the leg rest to move at the same time; the slidable frame moves and drives the driving rod to rotate via the linkage rod; and the driving rod drives the backrest and the driven rod to rotate together and move simultaneously with the cushion, so that “rubbing feel” on the back from the backrest is reduced, even no “rubbing feel” on the back is achieved, which improves people's comfort when using sofa.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural schematic diagram of Embodiment 1 of the present application;

FIG. 2 is a structural schematic diagram of Embodiment 1 of the present application;

FIG. 3 is a section schematic diagram of the rotatable assembly according to Embodiment 1 of the present application;

FIG. 4 is a structural schematic diagram of the seat spring mechanism according to Embodiment 1 of the present application;

FIG. 5 is a partial explosion view of Embodiment 1 of the present application, mainly illustrating the fixing assembly;

FIG. 6 is a structural schematic diagram of the telescoping assembly according to Embodiment 1 of the present application;

FIG. 7 is a partial explosion view of Embodiment 1 of the present application, mainly illustrating the telescoping assembly;

FIG. 8 is a structural schematic diagram of the leg rest, the expanding plate, the support mechanism and the connecting assembly according to Embodiment 1 of the present application, in which the leg rest is in use state;

FIG. 9 is a structural schematic diagram of the support mechanism and the connecting assembly according to Embodiment 1 of the present application;

FIG. 10 is an enlarged view of part A in FIG. 2;

FIG. 11 is a structural schematic diagram of driving assembly according to Embodiment 2 of the present application;

FIG. 12 is a structural schematic diagram of the fixing-connecting plate according to Embodiment 3 of the present application.

DESCRIPTION OF THE EMBODIMENTS

The present application will be further described in detail by reference to FIGS. 1-11.

The Embodiments of the present application discloses a compact sofa frame structure.

Embodiment 1

Referring to FIG. 1 and FIG. 2, the compact sofa iron frame structure includes a base frame 1 and a slidable frame 11 slidably mounted on the base frame 1 and connected to a cushion, in which the base frame 1 is provided with an adjusting assembly 2 configured to adjust an angle of a backrest, the slidable frame 11 is rotatably mounted with a leg rest 17 at an end away from the backrest, and the base frame 1 is provided with a driving assembly 9 configured to drive the leg rest 17 to rotate.

Referring to FIG. 1 and FIG. 2, an upper surface of the base frame 1 is configured to be in an oblique state, and a height of the base frame 1 at an end close to the backrest is lower than a height of the base frame 1 at an end away from the backrest. The slidable frame 11 is slidably mounted on the base frame 1, and is configured to be parallel to the upper surface of the base frame 1. The slidable frame 11 is configured to slide along a direction close to or away from the backrest. The adjusting assembly 2 includes a driving rod 21, a driven rod 22 and a linkage rod 23. A first mounting base 86 and a second mounting base 87 are fixedly mounted on the base frame 1 at two opposite side walls of the base frame 1 and at a side of the slidable frame 11, in particular the second mounting base 87 is located below the first mounting base 86. There are two adjusting assemblies 2 that corresponds to two first mounting bases 86, respectively.

Referring to FIG. 1 and FIG. 2, the driven rod 22 is rotatably connected at a bottom end thereof to the first mounting base 86 via a rotatable assembly 3, and the driving rod 21 is rotatably connected at a bottom end thereof to the second mounting base 87 via a rotatable assembly 3. The rotatable assembly 3 connected to the driven rod 22 will be described in detail as an example hereinafter.

Referring to FIG. 2 and FIG. 3, the rotatable assembly includes a step bolt 31 and a rotary bushing 32, in which the first mounting base 86 is provided with a mounting hole 34; the step bolt 31 passes though the mounting hole 34 and is in thread connection with the driven rod 22; and an annular rotating groove 33 is formed at an outer wall of the rotary bushing 32 by blending the rotary bushing 32. Moreover, the rotary bushing 32 is elastic and provided with an avoiding hole penetrating the rotary bushing 32, therefore the rotary bushing 32 may be extruded and then in snap connection with the mounting hole 34. A sidewall of the first mounting base 86 abuts against two opposite sidewalls of the annular rotating groove 33, and the rotary bushing 32 is rotatable relative to the first mounting base 86. The step bolt 31 horizontally passes through the rotary bushing 32, and a head of the step bolt 31 and the driven rod 22 abut against the two opposite sides of the rotary bushing for locating.

Referring to FIG. 1 and FIG. 2, an upper end of the driven rod 22 and an upper end of the driving rod 21 both extend above the slidable frame 11, and the upper end of the driven rod 22 is located above the upper end of the driving rod 21. Besides, the driving rod 21 is located between the driven rod 22 and the slidable frame 11, and the driving rod 21 is rotatably connected the upper end thereof with a fixing-connecting plate 12 rotatably connected to the driven rod 22. The fixing-connecting plate 12 is configured to be inclined upwards at an end away from the driving rod 21 and the driven rod 22. The backrest is fixedly mounted on two fixing-connecting plate 12. A first end of the linkage rod 23 is rotatably connected to a sidewall of the driving rod 21, and a second end of the linkage rod 23 passes under the slidable frame 11 and is rotatably connected to the sidewall of the slidable frame 11. An axis of rotation of two ends of the driving rod 21 and driven rod 22, and an axis of rotation of the linkage rod 23 are parallel and perpendicular to the sliding direction of the slidable frame 11.

Referring to FIG. 1 and FIG. 4, the slidable frame 11 is a frame structure and includes a main pipe 13 and an auxiliary pipe 14, in which the main pipe 13 is located at a side of the auxiliary pipe 14 close to the driving rod 21. The slidable frame 11 is provided with a seat spring mechanism 4 configured to support the cushion, in which the seat spring mechanism 4 includes a plurality of seat spring assemblies 41 and connecting cross plates 42. The seat spring assembly 41 is integrally provided with a hook at an end close to the driving rod 21, and the hook is configured to be hanged on the main pipe 13 for locating. The seat spring assembly 41 extends along the sliding direction of the slidable frame 11 and is arched. Besides, the seat spring assembly 41 is integrally provided at an end thereof away from the hook with a mounting part 43, and the axis of the mounting part 43 is parallel to the axis of rotation of the driving rod 21. The cushion is fixedly mounted on the plurality of the seat spring assemblies 41.

Referring to FIG. 4 and FIG. 5, a plurality of connecting cross plates 42 are arranged at intervals along the extending direction of the seat spring assembly 41, and each connecting cross plate 42 fixedly connects the plurality of seat spring assemblies 41 together. Each mounting part 43 is detachably connected with the auxiliary pipe 14 via a fixing assembly 5. The fixing assembly 5 includes a fixing plate 51 and an elastic pressing plate 52, in which the fixing plate 51 includes a vertical part 511, a first horizontal part 512 and a second horizontal part 513 that are connected to the vertical part 511 at an upper end and an lower end thereof, respectively. In particular, the first horizontal part 512 and the second horizontal part 513 are located at two sides of the vertical part 511, and the first horizontal part 512 is located at a side of the vertical part 511 close to the main pipe 13 and under the second horizontal part 513. The vertical part 511 abuts against a sidewall of the auxiliary pipe 14 at a side close to the main pipe 13, and the second horizontal part 513 is placed on the upper surface of the auxiliary pipe 14 and fixed by a bolt.

Referring to FIG. 4 and FIG. 5, the elastic pressing plate 52 includes a vertical section 53 and an abutting section 54 that are elastic and connected to each other. The vertical section 53 is fixedly mounted on a upper surface of the first horizontal part 512, and the abutting section 54 is connected to an upper end of the vertical section 53, and the abutting section 54 is configured to be inclined upwards and extend to an end of the vertical section 53. The mounting part 43 can be placed on the upper surface of the first horizontal part 512 and located between the abutting section 54 and the vertical part 511, then the hook is dragged to be hanged on the main pipe 13; further, the hook drags the mounting part 43 to be snapped between the abutting section 54 and the first horizontal part 512; the mounting part 43 abuts against the vertical section 53; and the abutting section 54 abuts against the mounting part 43 for locating, so as to realize the mounting of the seat spring assembly 41.

Referring to FIG. 4 and FIG. 5, the hook and the mounting part 43 are fixedly mounted with a first locating sleeve 15 and a second locating sleeve 16, respectively. The first locating sleeve 15 and the second locating sleeve 16 are both made of plastic material. The first locating sleeve 15 is configured to be hanged on the main pipe 13, so as to realize the contact between the first locating sleeve 15 and the main pipe 13. Besides, a plurality of the first locating sleeves 15 are fixedly connected together via a fixing cross plate 151. An annular locating groove 161 is formed on the second locating sleeve 16, and both of the vertical section 53 and the abutting section 54 can be in snap connection with the annular locating groove 161. Therefore, the second locating sleeve 16 abuts against the fixing plate 51 and the elastic pressing plate 52, so that the probability of noise between the seat spring assembly 41, and the main pipe 13 and the auxiliary pipe 14 is decreased.

Referring to FIG. 6 and FIG. 7, a telescoping assembly 10 configured to drive the cushion to extend is provided on the auxiliary pipe 14. In particular, the telescoping assembly 10 includes an extension plate 101, a motor for telescopic movement 102 and a telescoping screw rod 103. An upper surface of the auxiliary pipe 14 is fixedly mounted with a bearing plate 88 configured to horizontally extends away from the auxiliary pipe 14 towards the main pipe 13. The extension plate 101 is slidably mounted on the bearing plate 88, and has a sliding direction parallel to the sliding direction of the slidable frame 11. Besides, the cushion is fixedly mounted at an end away from the backrest on an upper surface of the extension plate 101. The motor for telescopic movement 102 is fixedly mounted on the bearing plate 88; the telescoping screw rod 103 is rotatably mounted on an upper surface of the bearing plate 88; the telescoping screw rod 103 is in thread connection with the extension plate 101; and the telescoping screw rod 103 is connected to an output shaft of the motor for telescopic movement 102. The motor for telescopic movement 102 is started and the telescoping screw rod 103 rotates, therefore the telescoping screw rod 103 rotates to drive the extension plate 101 and the cushion to move, so as to realize the extension and retraction of the cushion.

Referring to the FIG. 1 and FIG. 8, the slidable frame 11 is provided with a support mechanism 6 configured to support the leg rest 17. When the leg rest 17 is rotated to a side of the slidable frame 11 away from the backrest and is used outside of the sofa, an upper surface of the leg rest 17 is flush with an upper surface of the cushion; when the leg rest 17 retracts inside the sofa, the leg rest 17 is in a vertical state.

Referring to the FIG. 8 and FIG. 9, the state that the leg rest 17 is rotated outside of the sofa for use will be described in detail below an example. Two support mechanisms 6 are provided at intervals along the direction perpendicular to the sliding direction of the slidable frame 11. The support mechanism 6 includes a support plate 61, a first rotatable plate 62, a second rotatable plate 63, a third rotatable plate 64, a fourth rotatable plate 65 and a support rod 66, in which the support plate 61 is fixedly mounted on a lower surface of the leg rest 17, and the support plate 61 is configured to support the leg rest 17.

Referring to FIG. 8 and FIG. 9, a first rotation shaft 81 and a second rotation shaft 82 that are parallel, are fixedly mounted on two opposite sidewalls of the slidable frame 11. The first rotation shaft 81 is located above the second rotation shaft 82 and at a side of the second rotation shaft 82 away from the backrest, and the first rotation shaft 81 is in a vertical state and perpendicular to the sliding direction of the slidable frame 11. An end of the first rotatable plate 62 is rotatably mounted on the first rotation shaft 81, and the other end of the first rotatable plate 62 is configured to extend obliquely downwards to the outside of the sofa. The second rotatable plate 63 is rotatably mounted on the second rotation shaft 82, and the second rotatable plate 63 is configured to extend obliquely downwards to a side close to the first rotatable plate 62. An end of the third rotatable plate 64 is rotatably mounted on a bottom end of the second rotatable plate 63, and the third rotatable plate 64 is configured to pass the first rotatable plate 62 at a side thereof and contact the first rotatable plate 62. Besides, the first rotatable plate 62 and the third rotatable plate 64 are rotatably connected with each other at their contact point.

Referring to FIG. 8 and FIG. 9, a first support shaft 83, a second support shaft 84 and a third support shaft 85 that are parallel to each other, are fixedly mounted on sidewalls, facing each other, of two support plate 61. The third support shaft 85 is located at a side of the first support shaft 83 away from the slidable frame 11; the second support shaft is located between the third support shaft 85 and the first support shaft 83 and under the third support shaft 85 and the first support shaft 83; the axis of the first support shaft 83 and the axis of the first rotation shaft 81 is parallel; a top end of the third rotatable plate 64 is rotatably connected to the first support shaft 83; an end of the fourth rotatable plate 65 is rotatably mounted on a bottom end of the first rotatable plate 62; a top end of the fourth rotatable plate 65 is rotatably connected to the second support shaft 84; the support rod 66 is fixedly mounted on sidewalls, facing each other, of two first rotatable plates 62; and the axis of the support rod 66 and the axis of the first rotation shaft 81 are parallel.

Referring to FIG. 1 and FIG. 8, the support plate 61 is provided with an expanding plate 18 via a connecting assembly 7. The expanding plate 18 is located at a side of the leg rest 17 away from the backrest, and an upper surface of the expanding plate 18 is flush with the upper surface of the leg rest 17 when the leg rest 17 is rotated to the outside of the sofa for use, and the expanding plate 18 is configured to rotate to a side of the leg rest 17 close to the backrest, and in horizontal state when the leg rest 17 retracts to the inner side of the sofa.

Referring to FIG. 8 and FIG. 9, the connecting assembly 7 includes a first connecting plate 71 and a second connecting plate 72, in which a first end of the first connecting plate 71 is rotatably mounted on the third support shaft 85; a second end of the first connecting plate 71 is configured to be inclined downwards; an end of the second connecting plate 72 is rotatably mounted on a top end of the fourth rotatable plate 65; the second connecting plate 72 is configured to pass obliquely the first connecting plate 71 at a side thereof and contact the first connecting plate 71, and the first connecting plate 71 and the second connecting plate 72 are rotatably connected at their contact point; a top end of the second connecting plate 72 is fixedly connected to a bottom surface of the expanding plate 18; and a rotation axis of each component in support mechanism 6 and connecting assembly 7 are all parallel.

Referring to FIG. 8 and FIG. 9, in the process of rotating to the outside of the sofa, the leg rest 17 drives the first connecting plate 71 and the second connecting plate 72 to rotate at the same time, so as to make the expanding plate 18 rotate to a side of the leg rest 17 away from the backrest, then the leg rest 17 cooperates with the expanding plate 18 to support the leg. Besides, in the process that the leg rest 17 rotates inside of the sofa, the first connecting plate 71 and the second connecting plate 72 drives the expanding plate 18 to rotate to the inner side of the sofa, and the expanding plate 18 is located at a side of the leg rest 17 close to the backrest.

Referring to FIG. 2 and FIG. 8, the driving assembly 9 includes a driving plate 91 and a driving electric push rod 92, in which the driving plate 91 is fixedly mounted on the support rod 66, the driving electric push rod 92 is rotatably mounted on the base frame 1 and located at a side of the slidable frame 11 close to the backrest, and a piston rod of the driving electric push rod 92 is rotatably connected to the driving plate 91.

Referring to FIG. 2, FIG. 8 and FIG. 9, the driving electric push rod 92 is started and drives the support rod 66 to move; the support rod 66 moves to drive the first rotatable plate 62, the first rotatable plate 62, the third rotatable plate 64, the fourth rotatable plate 65, the support plate 61, the leg rest 17, the first connecting plate 71, the second connecting plate 72 and the expanding plate 18 to rotate at the same time, so that the leg rest 17 and the expanding plate 18 rotate outside the sofa for use. While retraction of the driving electric push rod 92 can drive the leg rest 17 and the expanding plate 18 to retract inside the sofa by rotation, at this time, an end of the second rotatable plate 63 away from the second rotation shaft 82 is configured to be inclined downwards the backrest.

Referring to FIG. 8 and FIG. 9, a fixing rod 19 is fixedly mounted a sidewall of the slidable frame 11 and located at a side the first rotatable plate 62 away from the backrest. Therefore, when the leg rest 17 is rotated to the outside of the sofa for use, a sidewall of the first rotatable plate 62 at a side away from the backrest is able to abut against a sidewall of the fixing rod 19 for limiting, so as to prevent a continuous rotation of the leg rest 17. Besides, the first rotatable plate 62 is formed with a fitting groove 621 that us fitted to the fixing rod 19, so as to prevent a continuous rotation of the leg rest 17, then the piston rod of the driving electric push rod 92 continuously moves to drive the slidable frame 11 to move, and the slidable frame 11 moves to drive the backrest to move and rotate at the same time, so as to adjust the position of the backrest. When the slidable frame 11 needs to move back, the driving electric push rod 92 is started and drives the leg rest 17 and the expanding plate 18 to rotate inside the sofa, then the piston rod of the driving electric push rod 92 continuously retracts to drive the slidable frame 11 to move back, and the slidable frame 11 moves back to drive the backrest to move and rotate to the original position.

Referring to FIG. 2 and FIG. 10, the slidable frame 11 is provided with a limiting assembly 94 configured to limit the leg rest 17 when rotating to the inner side of the sofa. In particular, the limiting assembly 94 includes a limiting electric push rod and a limiting block 95, in which the limiting electric push rod is fixedly mounted on the outer sidewall of the slidable frame 11, and the limiting block 95 is configured to horizontally and slidably cross the sidewall of the slidable frame 11, and has a sliding direction parallel to the axis of the second rotation shaft 82. Besides, the limiting block 95 is located under the second rotation shaft 82 and at a side of the second rotation shaft close to the backrest. Besides, when the leg rest 17 retracts to the inner side of the sofa by rotation, the limiting block 95 extends out of the inner sidewall of the slidable frame 11, and the limiting block 95 abuts against a sidewall of the second rotatable plate 63 at a side away from the backrest for locating, so as to prevent a rotation of the second rotatable plate 63; when the second rotatable plate 63 is needed to rotate, the limiting electric push rod is started and drives the limiting block 95 away from the second rotatable plate 63, so the second rotatable plate 63 is able to rotate freely.

Referring to FIG. 2 and FIG. 10, when the leg rest 17 is rotated outside the sofa, the first rotatable plate 62 abuts against the fixing rod 19; the piston rod of the driving electric push rod 92 continuously moves to drive the cushion to move; the cushion moves to adjust the position of the backrest, so as to realize that the leg rest 17 is rotated out firstly. Then when the cushion and the backrest needs to be adjusted, the driving electric push rod 92 continue to start and adjust the cushion. When the leg rest 17 rotates to the inner side of the sofa, the limiting electric push rod is started and drives the limiting block 95 close to the second rotatable plate 63, so that the limiting block 95 abuts against the second rotatable plate 63 for locating, then the driving electric push rod 92 is started and drives the second rotatable plate 63 to move, and the limiting block 95 limits the rotation of the second rotatable plate 63, therefore the second rotatable plate 63 moves and drives the cushion to move. Therefore, an individual adjustment of the cushion and the backrest is realized. When the leg rest 17 needs to be adjusted, the limiting electric push rod is started and drives the limiting block 95 to be separated from the second rotatable plate 63, then the leg rest 17 is able to be individually adjusted. Therefore, the cushion, the backrest, the leg rest 17 and the expanding plate 18 can be adjusted according to people's requirement.

The working principle of the embodiment in present application is that:

When the cushion and the backrest needs to be adjusted individually, the limiting electric push rod is started and drives the limiting block 95 to abut against the second rotatable plate 63 for locating, then the driving electric push rod 92 is started and drives the support rod 66 to move, therefore the cushion is pushed to move under the effect of the limiting block 95. The cushion and the backrest move and rotate at the same time, so as to realize an individual adjustment of the cushion and the backrest. When the leg rest 17 needs to be rotated out, the limiting electric push rod is started and drives the limiting block 95 to separate from the second rotatable plate 63, then the leg rest 17 and the expanding plate 18 can be driven to rotate outside the sofa for use.

The driving electric push rod 92 is started and drives the leg rest 17 and the expanding plate 18 to rotate outside the sofa for use; the first rotatable plate 62 abuts against the fixing rod 19; and the driving electric push rod 92 continue to be started and drive the first rotatable plate 62, so as to push the slidable frame 11 to move. The slidable frame 11 moves to adjust the position of the cushion and the backrest, so the position of the cushion, the backrest, the leg rest 17 and the expanding plate 18 can be adjusted according to people's requirement. Therefore, people's comfort when using sofa is improved. Besides, the adjustment can be realized by using the same electric push rod, so the energy and sofa costs are saved.

Embodiment 2

Referring to FIG. 2 and FIG. 11, the difference between the present embodiment and Embodiment 1 is that, the driving assembly 9 includes a first electric push rod 96 and a second electric push rod 97, in which the first electric push rod 96 is rotatably mounted on the base frame 1 and located at a side of the slidable frame 11 close to the driving rod 21. Besides, the piston rod of the first electric push rod 96 is rotatably connected to a sidewall of the slidable frame 11 at a side close to the driving rod 21; the second electric push rod 97 is rotatably mounted on the sidewall of the slidable frame 11 at a side close to the driving rod 21; and the piston rod of the second electric push rod 97 is rotatably connected to the support rod 66. Therefore, the first electric push rod 96 is started and drives the slidable frame 11 to move, and the second electric push rod 97 is started and drives the driving plate 91 to rotate.

The working principle of the embodiment in present application is that:

The first electric push rod 96 is started and drives the slidable frame 11 to move, and the second electric push rod 97 is started and drives the driving plate 91 and the leg rest 17 to rotate, so the slidable frame 11 and the cushion are able to individually move, and the leg rest 17 is able to individually rotate. Therefore, the adjusting manner when being used by people is increased, and people's comfort when using sofa can be further improved.

Embodiment 3

Referring to FIG. 2 and FIG. 12, the difference between the present embodiment and Embodiment 1 is that, the fixing-connecting plate 12 is configured to be inclined downwards and integrally provided with a connecting part 24 at a side away from the driven rod 22 and the driving rod 21, and the connecting part 24 is configured to be inclined upwards at an end away from the fixing-connecting plate.

Embodiment 4

Referring to FIG. 4, the difference between the present embodiment and Embodiment 1 is that, the seat spring mechanism 4 includes a plurality of tension springs and hooks integrally provided on two ends of the tension spring, and the shape of the tension spring is the same as the shape of combination of the plurality of the seat spring assemblies 41; the hook is configured to be hanged on the main pipe 13 and the auxiliary pipe 14 for locating, and the plurality of tension springs are arched and configured to support the cushion.

The above are preferable embodiments of the present application, and do not limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape and principle of present application should be covered by the protection scope of the present application.

Claims

1. A sofa frame structure, comprising a base frame, a slidable frame slidably connected on the base frame and connected to a cushion, wherein, the base frame is provided with an adjusting assembly configured to adjust an angle of a backrest, wherein the adjusting assembly comprises:

a driving rod and a driven rod, wherein the driving rod and the driven rod are both rotatably connected at one end of the driving rod and the driven rod on the base frame and rotatably connected to the backrest at a second end of the driving rod and the driven rod; and

a linkage rod, wherein the linkage rod is rotatably connected on the driving rod and slidably connected to the slidable frame;

wherein, the base frame is provided with a driving assembly configured to drive a leg rest rotatably connected on the slidable frame to rotate, and the slidable frame is provided with a fixing rod configured to limit movement of the leg rest.

2. The sofa frame structure according to claim 1, wherein, the slidable frame is provided with a telescoping assembly configured to drive the cushion to extend, wherein the telescoping assembly comprises:

an extension plate, wherein the extension plate is slidably connected on the slidable frame and connected to the cushion;

a motor for telescopic movement, wherein the motor for telescopic movement is provided on the slidable frame; and

a telescoping screw rod, wherein the telescoping screw rod is rotatably connected on the slidable frame, connected to an output shaft of the motor for telescopic movement and in thread connection with the extension plate.

3. The sofa frame structure according to claim 1, wherein, the base frame is provided with a limiting assembly, wherein the limiting assembly comprises:

a limiting electric push rod, wherein the limiting electric push rod is provided on the slidable frame;

a limiting block, wherein the limiting block is slidably connected on the slidable frame and connected to a piston rod of the limiting electric push rod; and the limiting block is configured to abut against the leg rest to prevent a rotation of the leg rest when the leg rest retracts into a sofa by rotation, so that the driving assembly is configured to drive the slidable frame to move individually.

4. The sofa frame structure according to claim 1, wherein, the driving assembly comprises:

a driving plate, wherein the driving plate is provided on the leg rest; and

a driving electric push rod, wherein the driving electric push rod is rotatably connected on the base frame and rotatably connected to the driving plate.

5. The sofa fame structure according to claim 1, wherein, the driving assembly comprises:

a first electric push rod, wherein the first electric push rod is rotatably connected on the base frame and rotatably connected to the slidable frame; and

a second electric push rod, wherein the second electric push rod is rotatably connected on the slidable frame and rotatably connected to the leg rest.

6. The sofa frame structure according to claim 1, wherein, the base frame is provided with a support mechanism configured to support the leg rest, wherein the leg rest is flush with an upper surface of the cushion when the leg rest is in use, and is in a vertical state when the leg rest retracts; the support mechanism comprises:

a support plate, wherein the support plate is provided on the leg rest;

a first rotatable plate and a second rotatable plate, wherein the first rotatable plate and the second rotatable plate are both rotatably connected on the slidable frame;

a third rotatable plate, wherein the third rotatable plate is rotatably connected on the second rotatable plate and rotatably connected to the support plate;

a fourth rotatable plate, wherein the fourth rotatable plate is rotatably connected on the first rotatable plate at an end away from the slidable frame and rotatably connected to the support plate; and

a support rod, wherein the support rod is provided on the first rotatable plate, and the driving assembly is connected to the support rod.

7. The sofa frame structure according to claim 6, wherein, the support plate is provided with an expanding plate via a connecting assembly, wherein the expanding plate is configured to be rotated to a side of the leg rest away from a sofa and cooperate with the leg rest to support a leg when the leg rest is rotated outside of the sofa for use, and the expanding plate is configured to rotate to a second side of the leg rest close to the sofa when the leg rest retracts, wherein the connecting assembly comprises:

a first connecting plate, wherein the first connecting plate is rotatably connected on the support plate; and

a second connecting plate, wherein the second connecting plate is rotatably connected at two ends of the second connecting plate to the first connecting plate and the fourth rotatable plate, respectively.

8. The sofa frame structure according to claim 1, wherein, the driving rod is rotatably provided with a fixing-connecting plate rotatably connected to the driven rod and configured to be fixed with the backrest.

9. The sofa frame structure according to claim 8, wherein, the driving rod is rotatably connected to the base frame via a rotatable assembly, wherein the rotatable assembly comprises:

a step bolt, wherein the step bolt passes through the base frame and is in thread connection with the driving rod; and

a rotary bushing, wherein the rotary bushing is in snap connection with the base frame via a snap-in groove and rotatably connected to the base frame; the step bolt passes through the rotary bushing and is in thread connection with the driving rod, so that the step bolt and the driving rod abut against the rotary bushing.

10. The sofa frame structure according to claim 8, wherein, the fixing-connecting plate is configured to be inclined downwards at an end of the fixing-connecting plate away from the driving rod and the driven rod.

11. The sofa frame structure according to claim 1, wherein, the slidable frame is provided with a seat spring mechanism configured to support the cushion.

12. The sofa frame structure according to claim 11, wherein, the seat spring mechanism comprises:

a plurality of seat spring assemblies, wherein the plurality of seat spring assemblies are provided at one end of the plurality of seat spring assemblies with a plurality of hooks configured to be hung on the slidable frame, and the plurality of seat spring assemblies are detachably connected at a second end of the plurality of seat spring assemblies to the slidable frame via a fixing assembly; and

a connecting cross plate, wherein the connecting cross plate is provided on the plurality of seat spring assemblies and configured to connect the plurality of seat spring assemblies together.

13. The sofa frame structure according to claim 12, wherein, the fixing assembly comprises:

a fixing plate, wherein the fixing plate is provided on the slidable frame, and each of the plurality of seat spring assemblies is placed on the fixing plate; and

an elastic pressing plate, wherein the elastic pressing plate is provided on the fixing plate and abuts against each of the plurality of seat spring assemblies for locating.

14. The sofa frame structure according to claim 12, wherein, a first locating sleeve and a second locating sleeve made of plastic material are provided on the hook and on each of the plurality of seat spring assemblies at an end away from the hook; the first locating sleeve and the second locating sleeve abut against the slidable frame and the fixing plate, respectively; and a plurality of the first locating sleeves are fixedly connected together via a fixing cross plate.

15. The sofa frame structure according to claim 11, wherein, the seat spring mechanism comprises a plurality of tension springs and a plurality of drag hooks provided on the plurality of the tension springs, wherein the plurality of drag hook are configured to be hung on the slidable frame for locating.