Multi-posture sofa frame and sofa

Abstract

The invention discloses a multi-posture sofa frame and a sofa, and relates to the technical field of sofas, the multi-posture sofa frame comprises a bottom frame, a backrest assembly, a linkage assembly and a driving mechanism, a leg support assembly is driven to unfold through a telescopic cylinder and a rotating rod, the linkage assembly is driven to move, and switching of multiple postures is achieved. Meanwhile, through the design of a guide groove, a multi-stage connecting rod structure and a limiting piece, it is ensured that the overall operation is stable and reliable, various use requirements such as a sitting posture, a TV posture or a lying posture are met, the sofa frame is always located at the position of zero leaning against the wall in the three postures, and the effects of improving comfort and stability, simplifying the operation process and enhancing user experience are achieved.

Description

Technical Field

[0001] This application relates to the technical field of sofas, and in particular to a multi-posture sofa frame and a sofa. Background Art

[0002] As a common furniture product, a sofa not only meets people's daily rest needs but also plays an important role in enhancing the comfort of home life. With the continuous improvement of modern people's requirements for the quality of life, especially in the pursuit of a healthy lifestyle, functional sofas have gradually become a hot spot in the market. Such sofas can meet people's usage needs in various scenarios, such as normal sitting postures, TV postures when watching TV, or lying postures when completely relaxed, greatly improving the user experience and quality of life.

[0003] Sofas are relatively large in volume and are generally placed against the wall. When the sofas in the related art are placed against the wall, a certain distance is reserved in advance between the sofa and the wall to prevent interference between the sofa backrest and the wall when the sofa is adjusted from a sitting posture to a more relaxed state, such as a TV posture or a full lying posture. In this way, multi-posture sofas will occupy a large amount of space in the room, restricting the further popularization and development of such products.

[0004] Therefore, there is an urgent need to develop a multi-posture sofa frame and a sofa that can be placed against the wall with zero distance. Summary of the Invention

[0005] In order to help solve the technical problem that the backrest occupies extra space distance during posture adjustment, this application provides a multi-posture sofa frame and a sofa.

[0006] In a first aspect, this application provides a multi-posture sofa frame, adopting the following technical solution: A multi-posture sofa frame includes a bottom frame, two backrest assemblies, two linkage assemblies, and a driving mechanism; one backrest assembly is connected to each side of the bottom frame, and each backrest assembly is connected to one linkage assembly; the linkage assembly includes a seat frame plate and a linkage rod group arranged between the bottom frame and the seat frame plate. One end of the seat frame plate is connected to the corresponding backrest assembly, and the end far from the backrest assembly is connected to a leg rest assembly, and the leg rest assembly is connected to the linkage rod group; the driving mechanism includes a telescopic cylinder and a rotating rod. The two ends of the rotating rod are respectively fixedly connected to the leg rest assemblies located on both sides of the bottom frame. One end of the telescopic cylinder is hinged to the bottom frame, and the other end is hinged to the rotating rod; when the telescopic rod of the telescopic cylinder extends, it pushes the rotating rod to drive the leg rest assembly to unfold and drives the linkage assembly to move towards the direction of the leg rest assembly, so that the leg rest assembly and the backrest assembly are sequentially adjusted from a sitting posture to a TV posture and a lying posture.

[0007] By adopting the above technical solution, while the driving mechanism drives the rotating rod to move through the telescopic cylinder and rotates at the same time, the leg rest assembly moves forward to perform an unfolding movement. During this process, the leg rest assembly drives the linkage assembly to move forward. As the leg rest assembly unfolds, the linkage assembly drives the backrest assembly to be adjusted forward synchronously to the lying position, which helps the sofa frame to always be in the zero-wall-adjacent position among the three postures, significantly improving the convenience and comfort for users to adjust the sofa posture.

[0008] Optionally, the bottom frame includes two spaced-apart support plates, a first connecting beam, and a second connecting beam. The two ends of the first connecting beam are respectively fixedly connected to one ends of the two support plates close to the backrest assembly. The second connecting beam is spaced from the first connecting beam. The two ends of the second connecting beam are respectively fixedly connected to the inner side walls of the two support plates close to the bottom. One guiding groove is provided on each of the opposite inner side walls of the two support plates along the length direction, and the guiding groove is inclined such that its height gradually increases from the direction of the backrest assembly towards the leg rest assembly.

[0009] By adopting the above technical solution, the bottom frame is composed of two support plates, a first connecting beam, and a second connecting beam, forming a stable frame structure. The first connecting beam and the second connecting beam are respectively fixedly connected to the support plates, enhancing the load-bearing capacity and stability of the entire sofa frame. At the same time, guiding grooves are provided on the inner side walls of the two support plates and are inclined such that their height gradually increases along the direction from the backrest assembly to the leg rest assembly, which can guide the lifting and translation movement trajectories of the linkage assembly during the switching of different postures, ensuring that the backrest assembly, the seat frame plate, and the leg rest assembly move smoothly and smoothly during the entire adjustment process. This design not only realizes the flexible conversion of multiple sitting postures but also ensures the maximization of the user experience comfort. Optionally, the linkage rod group includes a leg rest linkage rod, a first linkage connecting rod, a second linkage connecting rod, a third linkage connecting rod, a bottom frame connecting rod, and a sliding rod group. The sliding rod group is slidably connected to the guiding groove. The first linkage connecting rod is movably installed on the sliding rod group. One end of the second linkage connecting rod is hinged to the seat frame plate, and the other end is hinged to one end of the first linkage connecting rod. One end of the third linkage connecting rod is hinged to the seat frame plate at the end away from the second linkage connecting rod, and the end of the third linkage connecting rod away from the seat frame plate is hinged to the end of the first linkage connecting rod away from the second linkage connecting rod. One end of the leg rest linkage rod is hinged to the leg rest assembly, and the other end is hinged to the second linkage connecting rod. One end of the bottom frame connecting rod is hinged to the bottom frame, and the other end is hinged to the sliding rod group.

[0010] By adopting the above technical solution, when the telescopic cylinder pushes the rotating rod to drive the leg rest assembly to unfold, the sliding rod group in the linkage assembly slides along the guide groove, and the first linkage link, the second linkage link and the third linkage link work together to ensure the smooth movement of the seat frame plate. At the same time, the hinge design of the leg rest linkage rod and the second linkage link can effectively transmit torque, making the unfolding action of the leg rest assembly smoother. The bottom frame connecting rod further enhances the stability of the entire linkage system, avoiding the problem of structural shaking caused by uneven force, so as to achieve the precise conversion between multiple postures of the backrest assembly and the leg rest assembly, and improve the user experience. Optionally, the sliding rod group includes a first sliding linkage rod, a second sliding linkage rod, and a sliding connecting rod. A slider is provided on the sliding connecting rod, and the slider is slidably matched with the guide groove. One end of the sliding connecting rod close to the leg rest assembly is hinged to the first sliding linkage rod, and the other end of the sliding connecting rod is hinged to one end of the second sliding linkage rod. One end of the first sliding linkage rod is hinged to the end of the bottom frame connecting rod far from the bottom frame, and the other end of the first sliding linkage rod is hinged to the first linkage link, and the hinge point is located on the side of the hinge point between the third linkage link and the first linkage link far from the second linkage link. One end of the second sliding linkage rod far from the sliding connecting rod is hinged to the first linkage link, and the hinge point is located at one end close to the hinge point between the first linkage link and the second linkage link.

[0011] By adopting the above technical solution, the sliding rod group is composed of a first sliding linkage rod, a second sliding linkage rod and a sliding connecting rod, and the slider is slidably matched with the guide groove to achieve the smooth sliding of the sliding rod group in the guide groove. At the same time, the first sliding linkage rod and the second sliding linkage rod are respectively hinged to the bottom frame connecting rod and the first linkage link, ensuring that the sliding rod group can accurately transmit power and maintain a stable movement trajectory. This design effectively improves the stability of the sliding rod group during the posture switching of the sofa frame, avoiding the problem of inaccurate movement caused by loose structure. Optionally, a seat frame limiting member for restricting the rotation of the seat frame plate relative to the second linkage link is provided on the seat frame plate. When the telescopic rod of the telescopic cylinder extends, the leg rest assembly and the backrest assembly are in the TV posture or the lying posture, and the seat frame limiting member abuts against the second linkage link.

[0012] By adopting the above technical solution, the seat frame limiting member can effectively limit the rotation of the seat frame plate relative to the second linkage rod. When the telescopic rod of the telescopic cylinder extends, the leg rest assembly and the backrest assembly are adjusted to the TV position or the lying position. The seat frame limiting member abuts against the second linkage rod, thereby preventing the seat frame plate from rotating unexpectedly and improving the stability and reliability of the support of the seat frame plate for the human body in different postures. Optionally, the leg rest assembly includes a first leg rest link, a second leg rest link, a third leg rest link, a fourth leg rest link and a support assembly. The first leg rest link is hinged to the seat frame plate. One end of the first leg rest link is hinged to the leg rest linkage rod. The other end of the first leg rest link is hinged to one end of the second leg rest link. The second leg rest link is hinged to the third leg rest link. The end of the second leg rest link away from the first leg rest link is hinged to the support assembly. One end of the third leg rest link is hinged to the seat frame plate, and the other end is hinged to the fourth leg rest link. The end of the fourth leg rest link away from the third leg rest link is connected to the support assembly. Both ends of the rotating rod are fixedly connected to the third leg rest links located on both sides of the bottom frame.

[0013] By adopting the above technical solution, the leg rest assembly is composed of multiple linkages and a support assembly, forming a multi-degree-of-freedom linkage structure. The first leg rest link is hinged to the seat frame plate and connected to the entire system through the leg rest linkage rod, ensuring that the leg rest can be unfolded and retracted freely; the second leg rest link, the third leg rest link and the fourth leg rest link are sequentially hinged and connected, and finally firmly connected with the help of the support assembly. This design can ensure the uniform transmission of force and the improvement of stability during various posture conversions. At the same time, the design method of fixedly connecting the rotating rod with the third leg rest link further enhances the coordination and consistency of the overall structure, ensuring the comfort experience and safety of the user during use. Therefore, this design solution effectively achieves the performance goal of flexible adjustment and stability of the leg rest part. Optionally, the support assembly includes a first leg rest support, a second leg rest support and a third leg rest support. The first leg rest support is hinged to the fourth leg rest link. A first support portion is provided at the end of the first leg rest support away from the fourth leg rest link. One end of the first support portion is hinged to the end of the second leg rest link away from the first leg rest link. The other end of the first support portion is hinged to one end of the third leg rest support. The end of the third leg rest support away from the first support portion is hinged to the second leg rest support. A second support portion is provided at one end of the second leg rest support. The end of the second leg rest support away from the second support portion is hinged to the end of the fourth leg rest link away from the third leg rest link.

[0014] By adopting the above technical solution, the first leg rest support, the second leg rest support and the third leg rest support together form a stable triangular support structure, which can effectively disperse the pressure exerted by the human legs. Among them, the first leg rest support is hinged to the fourth leg rest link and is connected to the second leg rest link and the third leg rest support respectively through the first support, realizing reliable support for the second leg rest link; the third leg rest support and the second leg rest support further strengthen the stability of the overall structure. At the same time, the second leg rest support enhances the rigidity of the entire support assembly through the second support part, ensuring that during the switching process of different postures, the leg rest assembly supports the human legs smoothly and comfortably. Optionally, the leg rest assembly further includes a leg rest limiting member for restricting the rotation of the third leg rest link relative to the second leg rest link, and the leg rest limiting member is arranged between the hinge points where the second leg rest link is connected to the first leg rest link and the third leg rest link respectively.

[0015] By adopting the above technical solution, when the leg rest assembly is in the sitting position, TV position and lying position, the leg rest limiting member can effectively restrict the rotation of the third leg rest link relative to the second leg rest link. Specifically, in the sitting position, the leg rest limiting member prevents the leg rest assembly from over-contracting and ensures that it docks in a suitable position; in the TV position and lying position, the leg rest limiting member ensures that the leg rest assembly maintains a stable form, improving the reliability and stability of the human leg support. Optionally, the backrest assembly includes a backrest member, a first backrest link, a second backrest link and a backrest linkage rod. The first backrest link is hinged to the seat frame plate. The backrest member includes a connecting part and a plugging part. One end of the connecting part is hinged to a free end of the first backrest link, the end of the connecting part far from the first backrest link is hinged to one end of the second backrest link, the end of the second backrest link far from the connecting part is hinged to the seat frame plate, and one end of the backrest linkage rod is hinged to the bottom frame and the other end is hinged to the free end of the first backrest link far from the connecting part.

[0016] By adopting the above technical solutions, the backrest assembly can achieve smooth switching among multiple postures. Specifically, the first backrest connecting rod is hinged to the seat frame plate, enabling the backrest assembly to change its angle as the seat frame plate moves; the backrest member consists of a connecting portion and a plug-in portion, which not only enhances the structural strength but also facilitates assembly and maintenance; the hinged design of the second backrest connecting rod and the seat frame plate ensures the stability of the backrest in different postures; one end of the backrest linkage rod is hinged to the bottom frame and the other end is hinged to the first backrest connecting rod. This design can effectively transmit torque under the action of the driving mechanism, ensuring a smooth transition of the backrest assembly among the sitting posture, TV posture, and lying posture. Generally, this design significantly improves the user experience and comfort. Optionally, the backrest assembly further includes a first backrest limiting member and a second backrest limiting member. The first backrest limiting member is disposed at one end of the connecting portion close to the first backrest connecting rod, and the second backrest limiting member is disposed at one end of the second backrest connecting rod close to the connecting portion.

[0017] By adopting the above technical solutions, when the backrest assembly is in the sitting posture and TV posture, the first backrest limiting member can effectively limit the excessive rotation of the first backrest connecting rod relative to the connecting portion, ensuring the stability of the backrest in these two postures and improving the user experience; when the backrest assembly switches to the lying posture, the second backrest limiting member comes into play, preventing the unexpected rotation of the connecting portion relative to the second backrest connecting rod, further ensuring the stability of the backrest in the lying posture and enhancing the sense of security and comfort when the human body leans on it.

[0018] In a second aspect, the present application provides a multi-posture sofa, adopting the following technical solutions: A multi-posture sofa includes the above-mentioned multi-posture sofa frame, a sofa backrest mounted on the backrest member, a sofa seat plate mounted on the seat frame plate, a first leg rest plate mounted on the first leg rest support, and a second leg rest plate mounted on the second leg rest support.

[0019] By adopting the above technical solutions, while the driving mechanism pushes the rotating rod to move and rotate through the telescopic cylinder, the leg rest assembly makes an unfolding movement forward, enabling the first leg rest plate and the second leg rest plate to be in a horizontal state, facilitating the user to place their legs. The leg rest assembly drives the linkage assembly to move forward. As the leg rest assembly unfolds, the linkage assembly drives the sofa seat plate, the backrest assembly, and the sofa backrest to be adjusted forward synchronously to the lying posture position, which helps the sofa frame to always be in a zero-wall-adjacent position among the three postures, significantly improving the convenience and comfort for the user to adjust the sofa posture.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. While the driving mechanism moves the rotating rod through the telescopic cylinder and rotates at the same time, the leg rest assembly moves forward in an unfolding motion. During this process, the leg rest assembly drives the linkage assembly forward. As the leg rest assembly unfolds, the linkage assembly drives the backrest assembly to adjust forward synchronously to the lying position, which helps to keep the sofa frame in the zero-wall position in all three postures, significantly improving the convenience and comfort of the user to adjust the sofa posture. 2. The linkage assembly and the guide groove work together to ensure the synchronism and stability of all parts of the sofa during the posture adjustment process, avoiding the phenomenon of jerky or unstable movement caused by unreasonable structural design, and effectively improving the reliability and coordination of the overall operation. 3. The design of the seat frame limit piece and the leg rest limit piece accurately limits the relevant parts at key positions, ensuring the stable support performance of the sofa in different postures, especially enhancing the safety and reliability of the human body leaning in the TV posture and the lying posture. Description of the Drawings

[0021] Figure 1 It is a schematic top view structure diagram of a multi-posture sofa frame disclosed in the present application when in the lying position.

[0022] Figure 2 It is a schematic bottom view structure diagram of a multi-posture sofa frame disclosed in the present application when in the lying position.

[0023] Figure 3 It is a schematic structure diagram of the separation of the bottom frame and the linkage assembly of a multi-posture sofa frame disclosed in the present application when in the sitting position.

[0024] Figure 4 It is a sectional view taken along the Figure 3 A-A section plane in

[0025] Figure 5 It is a sectional view taken along the Figure 1 B-B section plane in

[0026] Figure 6 It is a schematic structure diagram of a multi-posture sofa frame disclosed in the present application when in the TV posture.

[0027] Figure 7 It is a schematic structure diagram of a multi-posture sofa disclosed in the present application when in the TV posture.

[0028] Description of the Reference Numerals: 1. Bottom frame; 11. Support plate; 12. First connecting beam; 13. Second connecting beam; 14. Guide groove; 2. Backrest assembly; 21. Backrest member; 211. Connecting portion; 2111. First backrest limiting member; 212. Insertion portion; 22. First backrest connecting rod; 23. Second backrest connecting rod; 231. Second backrest limiting member; 24. Backrest linkage rod; 3. Linkage assembly; 31. Seat frame plate; 311. Seat frame limiting member; 32. Linkage rod group; 321. Leg rest linkage rod; 322. First linkage connecting rod; 323. Second linkage connecting rod; 324. Third linkage connecting rod; 325. Bottom frame connecting rod; 326. Sliding rod group; 3261. First sliding linkage rod; 3262. Second sliding linkage rod; 3263. Sliding connecting rod; 32631. Slide block; 4. Driving mechanism; 41. Telescopic cylinder; 42. Rotating rod; 5. Leg rest assembly; 51. First leg rest connecting rod; 52. Second leg rest connecting rod; 521. Leg rest limiting member; 53. Third leg rest connecting rod; 54. Fourth leg rest connecting rod; 55. Support assembly; 551. First leg rest support; 5511. First support portion; 552. Second leg rest support; 5521. Second support portion; 553. Third leg rest support; 101. Sofa backrest; 102. Sofa seat board; 103. First leg rest board; 104. Second leg rest board. Detailed implementation mode

[0029] The following is combined with Figures 1 to 7 to further elaborate on this application in detail.

[0030] The embodiment of this application discloses a multi-posture sofa frame.

[0031] A multi-posture sofa frame. Refer to Figure 1 and Figure 2, including a bottom frame 1, two backrest assemblies 2, two linkage assemblies 3 and a drive mechanism 4; one backrest assembly 2 is connected to each side of the bottom frame 1, and each backrest assembly 2 is connected to a linkage assembly 3; the linkage assembly 3 includes a seat frame plate 31 and a linkage rod group 32 arranged between the bottom frame 1 and the seat frame plate 31. One end of the seat frame plate 31 is connected to the corresponding backrest assembly 2, and the end far from the backrest assembly 2 is connected to a leg rest assembly 5, and the leg rest assembly 5 is connected to the linkage rod group 32; the drive mechanism 4 includes a telescopic cylinder 41 and a rotating rod 42. In the embodiment of the present application, the telescopic cylinder 41 can be an electric cylinder, a hydraulic cylinder or a pneumatic cylinder. The two ends of the rotating rod 42 are respectively fixedly connected to the leg rest assemblies 5 located on both sides of the bottom frame 1. One end of the telescopic cylinder 41 is hinged to the bottom frame 1. In the embodiment of the present application, two support plates are arranged on the bottom frame 1, pins are arranged on the support plates, ear plates are arranged on the telescopic cylinder 41, and the pins are rotatably connected to the ear plates. The other end of the telescopic cylinder 41 is hinged to the rotating rod 42, and its specific connection structure is the same as the connection structure of the bottom frame 1. When the telescopic rod of the telescopic cylinder 41 extends, it pushes the rotating rod 42 to move and rotate at the same time. The rotating rod 42 drives the leg rest assembly 5 to unfold and drives the linkage assembly 3 to move in the direction of the leg rest assembly 5, so that the leg rest assembly 5 and the backrest assembly 2 are adjusted from the sitting position to the TV position and the lying position in sequence.

[0032] It should be noted that the multi-posture of the multi-posture sofa frame in the present application means that the sofa frame has three postures, namely the sitting position, the TV position and the lying position. When in the sitting position, the leg rest assembly 5 is in a retracted state, and the angle between the backrest member 21 of the backrest assembly 2 and the seat frame plate 31 is the smallest. When in the TV position, the leg rest assembly 5 is in an unfolded state, and the angle between the backrest member 21 and the seat frame plate 31 remains unchanged. When in the lying position, the leg rest assembly 5 is in an unfolded state, and the angle between the backrest member 21 of the backrest assembly 2 and the seat frame plate 31 becomes the largest, so that the backrest assembly 2 is in a reclined state. Zero-wall refers to that the end of the bottom frame 1 far from the leg rest assembly 5 is the end against the wall. The boundary of the backrest assembly 2 far from the leg rest assembly 5 does not exceed the end of the bottom frame 1 against the wall during the conversion of the three postures, that is, the zero-wall effect of the sofa frame. Specifically, the drive mechanism 4 makes the rotating rod 42 move and rotate at the same time by pushing the telescopic cylinder 41, so that the leg rest assembly 5 makes an unfolding movement forward. During this process, the leg rest assembly 5 drives the linkage assembly 3 to move forward. The linkage assembly 3 drives the backrest assembly 2 to adjust forward to the TV position and finally to the lying position synchronously with the unfolding of the leg rest assembly 5, which helps to ensure that the backrest assembly 2 never exceeds the end of the bottom frame 1 far from the leg rest assembly 5 in the three postures, without moving the sofa frame to reserve space for the backrest assembly 2 to recline, significantly improving the convenience and comfort of the user to adjust the sofa posture.

[0033] Refer to Figure 3 and Figure 4, the bottom frame 1 includes two spaced-apart support plates 11, a first connecting beam 12, and a second connecting beam 13. The two ends of the first connecting beam 12 are respectively fixedly connected to one ends of the two support plates 11 close to the backrest assembly 2. The second connecting beam 13 is spaced from the first connecting beam 12, and the two ends of the second connecting beam 13 are respectively fixedly connected to the inner side walls of the two support plates 11 close to the bottom. On the opposite inner side walls of the two support plates 11, a guiding groove 14 is provided along the length direction. The guiding groove 14 is inclined such that its height gradually increases from the backrest assembly 2 towards the leg rest assembly 5; the bottom frame 1 is composed of two support plates 11, a first connecting beam 12, and a second connecting beam 13, forming a stable frame structure. The first connecting beam 12 and the second connecting beam 13 are respectively fixedly connected to the support plate 11, enhancing the load-bearing capacity and stability of the entire sofa frame. At the same time, the guiding groove 14 is provided on the inner side walls of the two support plates 11 and is inclined such that its height gradually increases along the direction from the backrest assembly 2 to the leg rest assembly 5, which can guide the movement trajectory of the linkage assembly 3 during the switching of different postures, ensuring that the backrest assembly 2, the seat frame plate 31, and the leg rest assembly 5 move smoothly and smoothly during the entire adjustment process. This design not only realizes the flexible conversion of multiple sitting postures but also ensures the maximization of the user experience comfort.

[0034] Refer to Figures 2 to 5, the linkage rod group 32 includes a leg rest linkage rod 321, a first linkage rod 322, a second linkage rod 323, a third linkage rod 324, a bottom frame connecting rod 325 and a sliding rod group 326. The sliding rod group 326 is slidably connected to the guide groove 14. The first linkage rod 322 is movably installed on the sliding rod group 326. One end of the second linkage rod 323 is hinged to the seat frame plate 31, and the other end is hinged to one end of the first linkage rod 322. One end of the third linkage rod 324 is hinged to the seat frame plate 31 at the end away from the second linkage rod 323, and the end of the third linkage rod 324 away from the seat frame plate 31 is hinged to the end of the first linkage rod 322 away from the second linkage rod 323. One end of the leg rest linkage rod 321 is hinged to the leg rest assembly 5, and the other end is hinged to the second linkage rod 323. One end of the bottom frame connecting rod 325 is hinged to the bottom frame 1, and the other end is hinged to the sliding rod group 326. It should be noted that hinge holes are provided on two hinge parts at each hinge point, and hinge shafts are installed in the hinge holes. When the telescopic cylinder 41 pushes the rotating rod 42 to drive the leg rest assembly 5 to unfold, the sliding rod group 326 in the linkage assembly 3 slides along the guide groove 14, and the first linkage rod 322, the second linkage rod 323 and the third linkage rod 324 work together to ensure the stable movement of the seat frame plate 31. At the same time, the hinge design of the leg rest linkage rod 321 and the second linkage rod 323 can effectively transmit the torque, making the unfolding action of the leg rest assembly 5 smoother. The bottom frame connecting rod 325 further enhances the stability of the entire linkage system, avoiding the problem of structural shaking caused by uneven force, thereby realizing the precise conversion between multiple postures of the backrest assembly 2 and the leg rest assembly 5 and improving the user experience.

[0035] Refer to Figure 2 and Figure 4, the sliding rod group 326 includes a first sliding linkage rod 3261, a second sliding linkage rod 3262, and a sliding connecting rod 3263. A slider 32631 is provided on the sliding connecting rod 3263. The slider 32631 is in sliding fit with the guide groove 14. One end of the sliding connecting rod 3263 close to the leg rest assembly 5 is hinged to the first sliding linkage rod 3261, and the other end of the sliding connecting rod 3263 is hinged to one end of the second sliding linkage rod 3262. One end of the first sliding linkage rod 3261 is hinged to the end of the bottom frame connecting rod 325 away from the bottom frame 1. The other end of the first sliding linkage rod 3261 is hinged to the first linkage rod 322, and the hinge point is located on the side of the hinge point between the third linkage rod 324 and the first linkage rod 322 away from the second linkage rod 323. The other end of the second sliding linkage rod 3262 away from the sliding connecting rod 3263 is hinged to the first linkage rod 322, and the hinge point is located at one end close to the hinge point between the first linkage rod 322 and the second linkage rod 323. The sliding rod group 326 is composed of the first sliding linkage rod 3261, the second sliding linkage rod 3262, and the sliding connecting rod 3263, and is in sliding fit with the guide groove 14 through the slider 32631, realizing the smooth sliding of the sliding rod group 326 in the guide groove 14. At the same time, the first sliding linkage rod 3261 and the second sliding linkage rod 3262 are respectively hinged to the bottom frame connecting rod 325 and the first linkage rod 322, ensuring that the sliding rod group 326 can accurately transmit power and maintain a stable movement track. This design effectively improves the stability of the sliding rod group 326 during the posture switching of the sofa frame, avoiding the problem of movement misalignment caused by loose structure.

[0036] Refer to Figure 1 and Figure 6 , a seat frame limiting member 311 for restricting the rotation of the seat frame plate 31 relative to the second linkage rod 323 is provided on the seat frame plate 31. When the telescopic rod of the telescopic cylinder 41 extends, the leg rest assembly 5 and the backrest assembly 2 are in the TV posture or the lying posture, and the seat frame limiting member 311 abuts against the second linkage rod 323. The seat frame limiting member 311 can effectively restrict the rotation of the seat frame plate 31 relative to the second linkage rod 323. In the embodiment of the present application, the seat frame limiting member 311 is a limiting pin shaft, which is fixed to the seat frame plate 31 by welding. When the telescopic rod of the telescopic cylinder 41 extends, the leg rest assembly 5 and the backrest assembly 2 are driven to be adjusted to the TV posture or the lying posture state, and the seat frame limiting member 311 abuts against the second linkage rod 323, thereby avoiding the unexpected rotation of the seat frame plate 31 and improving the stability and reliability of the seat frame plate 31 in supporting the human body in different postures.

[0037] Refer to Figure 5, the leg rest assembly 5 includes a first leg rest link 51, a second leg rest link 52, a third leg rest link 53, a fourth leg rest link 54 and a support assembly 55. The first leg rest link 51 is hinged to the seat frame plate 31. One end of the first leg rest link 51 is hinged to the leg rest linkage rod 321. The other end of the first leg rest link 51 is hinged to one end of the second leg rest link 52. The second leg rest link 52 is hinged to the third leg rest link 53. The end of the second leg rest link 52 away from the first leg rest link 51 is hinged to the support assembly 55. One end of the third leg rest link 53 is hinged to the seat frame plate 31, and the other end is hinged to the fourth leg rest link 54. The end of the fourth leg rest link 54 away from the third leg rest link 53 is connected to the support assembly 55. Both ends of the rotating rod 42 are fixedly connected to the third leg rest links 53 located on both sides of the bottom frame 1. The leg rest assembly 5 is composed of multiple links and the support assembly 55, forming a linkage structure with multiple degrees of freedom. The first leg rest link 51 is hinged to the seat frame plate 31 and connected to the entire system through the leg rest linkage rod 321, ensuring that the leg rest can be unfolded and retracted freely. The second leg rest link 52, the third leg rest link 53 and the fourth leg rest link 54 are hinged and connected in sequence and finally firmly connected by means of the support assembly 55. This design can ensure the uniform transmission of force and the improvement of stability during various attitude conversions. At the same time, the design method of fixedly connecting the rotating rod 42 to the third leg rest link 53 further enhances the coordination and consistency of the overall structure, ensuring the comfort experience and safety of the user during use. Therefore, this design scheme effectively achieves the performance goals of flexible adjustment and stability of the leg rest part.

[0038] Referring to Figure 5, the support assembly 55 includes a first leg support 551, a second leg support 552, and a third leg support 553. The first leg support 551 is hinged to the fourth leg link 54. One end of the first leg support 551 away from the fourth leg link 54 is provided with a first support portion 5511. One end of the first support portion 5511 is hinged to one end of the second leg link 52 away from the first leg link 51. The other end of the first support portion 5511 is hinged to one end of the third leg support 553. One end of the third leg support 553 away from the first support portion 5511 is hinged to the second leg support 552. One end of the second leg support 552 is provided with a second support portion 5521. One end of the second leg support 552 away from the second support portion 5521 is hinged to one end of the fourth leg link 54 away from the third leg link 53. The first leg support 551, the second leg support 552, and the third leg support 553 together form a stable triangular support structure, which can effectively disperse the pressure exerted by the human leg. Among them, the first leg support 551 is hinged to the fourth leg link 54 and is connected to the second leg link 52 and the third leg support 553 through the first support portion 5511, realizing reliable support for the second leg link 52. The third leg support 553 and the second leg support 552 further enhance the stability of the overall structure. At the same time, the second leg support 552 enhances the rigidity of the entire support assembly 55 through the second support portion 5521, ensuring that the leg rest assembly 5 supports the human leg smoothly and comfortably during the switching of different postures.

[0039] Referring to Figure 4 and Figure 5 , the leg rest assembly 5 further includes a leg rest limiting member 521 for restricting the relative rotation of the third leg link 53 with respect to the second leg link 52. The leg rest limiting member 521 is provided on the second leg link 52 between the hinge points where the second leg link 52 is respectively connected to the first leg link 51 and the third leg link 53. When the leg rest assembly 5 is in the sitting position, TV position, and lying position, the leg rest limiting member 521 can effectively restrict the relative rotation of the third leg link 53 with respect to the second leg link 52. Specifically, in the sitting position, the leg rest limiting member 521 prevents the leg rest assembly 5 from over-contracting and ensures that it docks in a suitable position. In the TV position and lying position, the leg rest limiting member 521 ensures that the leg rest assembly 5 maintains a stable shape, improving the reliability and stability of the human leg support.

[0040] Referring to Figure 6, the backrest assembly 2 includes a backrest member 21, a first backrest link 22, a second backrest link 23, and a backrest linkage rod 24. The first backrest link 22 is hinged to the seat frame plate 31. The backrest member 21 includes a connecting portion 211 and a plugging portion 212. The plugging portion 212 is used for plugging the backrest. One end of the connecting portion 211 is hinged to a free end of the first backrest link 22. The end of the connecting portion 211 away from the first backrest link 22 is hinged to one end of the second backrest link 23. The end of the second backrest link 23 away from the connecting portion 211 is hinged to the seat frame plate 31. One end of the backrest linkage rod 24 is hinged to the bottom frame 1, and the other end is hinged to the free end of the first backrest link 22 away from the connecting portion 211; the backrest assembly 2 can achieve smooth switching among multiple postures. Specifically, the first backrest link 22 is hinged to the seat frame plate 31, so that the backrest assembly 2 can change the angle with the movement of the seat frame plate 31; the backrest member 21 is composed of the connecting portion 211 and the plugging portion 212, which not only enhances the structural strength, but also facilitates assembly and maintenance; the hinged design of the second backrest link 23 and the seat frame plate 31 ensures the stability of the backrest in different postures; one end of the backrest linkage rod 24 is hinged to the bottom frame 1, and the other end is hinged to the first backrest link 22. This design can effectively transmit the torque under the action of the driving mechanism 4, ensuring the smooth conversion of the backrest assembly 2 among the sitting posture, TV posture, and lying posture. Generally, this design significantly improves the user experience and comfort.

[0041] Refer to Figure 5 and Figure 6 , the backrest assembly 2 further includes a first backrest limiting member 2111 and a second backrest limiting member 231. The first backrest limiting member 2111 is arranged at one end of the connecting portion 211 close to the first backrest link 22, and the second backrest limiting member 231 is arranged at one end of the second backrest link 23 close to the connecting portion 211; when the backrest assembly 2 is in the sitting posture and TV posture states, the first backrest limiting member 2111 can effectively limit the excessive rotation of the first backrest link 22 relative to the connecting portion 211, ensuring the stability of the backrest in these two postures and improving the user experience; when the backrest assembly 2 switches to the lying posture state, the second backrest limiting member 231 plays a role in preventing the unexpected rotation of the connecting portion 211 relative to the second backrest link 23, further ensuring the stability of the backrest in the lying posture state and enhancing the sense of security and comfort when the human body leans on it.

[0042] The working principle of a multi-posture sofa frame according to an embodiment of the present application is as follows: The initial state is the sitting posture state. In the sitting posture state, the leg rest assembly 5 is retracted below the seat frame plate 31. The leg rest limiting member 521 abuts against one end of the third leg rest link 53 close to the fourth leg rest link 54. The sliding link 3263 is located at one end of the guide groove 14 close to the backrest assembly 2. The first backrest limiting member 2111 abuts against the first backrest link 22. The included angle between the insertion portion 212 of the backrest member 21 and the upper surface of the seat frame plate 31 is set as an obtuse angle, so that in the sitting posture state, the use experience of the seat frame plate 31 and the backrest assembly 2 is more comfortable; Start the telescopic cylinder 41 to work. While its telescopic rod extends and pushes the rotating rod 42 to move and rotate at the same time, it drives the first leg rest link 51 and the second leg rest link 52 to rotate away from the backrest assembly 2. The third leg rest link 53 and the fourth leg rest link 54 rotate accordingly. Due to the limitation of the hinge connection of the first leg rest support 551, the second leg rest support 552, and the third leg rest support 553, the leg rest assembly 5 retracted below the seat frame plate 31 gradually unfolds; When the leg rest assembly 5 is fully unfolded, make the leg rest limiting member 521 abut against the third leg rest link 53 on the side of the hinge point of the third leg rest link 53 and the second leg rest link 52 away from the fourth leg rest link 54, and the seat frame limiting member 311 abuts against the second linkage link 323, which is the TV state; The telescopic rod of the telescopic cylinder 41 continues to extend, pushing the leg rest assembly 5 to continue to move, driving the linkage assembly 3 to move from one end close to the backrest assembly 2 to one end close to the leg rest assembly 5 along the guide groove 14; Under the guidance of the guide groove 14 of the slider 32631 of the sliding link 3263, the backrest assembly 2 is driven by the linkage assembly 3. The seat frame plate 31 pulls the first backrest link 22 and the second backrest link 23, causing the backrest member 21 and the backrest linkage rod 24 to rotate accordingly. Due to the drive of the first backrest link 22 and the second backrest link 23 at both ends of the backrest member 21, its insertion portion 212 rotates towards one end away from the leg rest assembly 5, so that the included angle between the insertion portion 212 and the upper surface of the linkage assembly 3 reaches the maximum, which is the lying posture state. One end of the bottom frame 1 away from the leg rest assembly 5 is the end against the wall. The extreme boundary on the side of the backrest assembly 2 away from the leg rest assembly 5 will not exceed the end of the bottom frame 1 against the wall during the conversion of the three postures, which is the zero-wall effect of the sofa frame; Start the telescopic cylinder 41 to retract the telescopic rod. The seat frame plate 31 drives the backrest assembly 2 to move backward. Under the limitation of the backrest linkage rod 24, the first backrest link 22 rotates, driving the backrest member 21 to rotate until the first backrest limiting member 2111 abuts against the first backrest link, that is, it is converted from the lying posture to the TV posture. The telescopic rod continues to retract, driving the leg rest assembly 5 to retract below the seat frame plate 31 until the leg rest limiting member 521 abuts against the third leg rest link 53, that is, it is converted from the TV posture to the sitting posture. An embodiment of the present application also discloses a multi-posture sofa.

[0043] A multi-posture sofa, referring to Figure 7, including the above multi-posture sofa frame, the sofa backrest 101 installed on the backrest member 21, the sofa seat board 102 installed on the seat frame board 31, the first leg rest board 103 installed on the first leg rest support 551, and the second leg rest board 104 installed on the second leg rest support 552. The driving mechanism 4 drives the rotating rod 42 to move and rotate simultaneously through the telescopic cylinder 41, so that the leg rest assembly 5 makes a forward unfolding movement, making the first leg rest board 103 and the second leg rest board 104 in a horizontal state, facilitating the user to place the legs. The leg rest assembly 5 drives the linkage assembly 3 to move forward. The linkage assembly 3 drives the sofa seat board 102, the backrest assembly 2 and the sofa backrest 101 to be adjusted forward to the lying position synchronously as the leg rest assembly 5 unfolds, which helps the sofa frame to always be in a zero-wall position among the three postures, significantly improving the convenience and comfort of the user to adjust the sofa posture.

[0044] The above are all the preferred embodiments of the present application, and do not limit the protection scope of the present application in turn. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A multi-posture sofa frame, characterized in that: It comprises a bottom frame (1), two backrest components (2), two linkage components (3) and a driving mechanism (4); The bottom frame (1) is connected to one backrest assembly (2) on each side, and each backrest assembly (2) is connected to one linkage assembly (3); The linkage assembly (3) comprises a seat frame plate (31) and a linkage rod group (32) arranged between the bottom frame (1) and the seat frame plate (31); one end of the seat frame plate (31) is connected to the corresponding backrest assembly (2), and the end away from the backrest assembly (2) is connected to the leg support assembly (5); the leg support assembly (5) is connected to the linkage rod group (32); The driving mechanism (4) comprises a telescopic cylinder (41) and a rotating rod (42), the two ends of the rotating rod (42) are respectively fixedly connected to the leg support assemblies (5) located on both sides of the bottom frame (1), one end of the telescopic cylinder (41) is hinged to the bottom frame (1), and the other end is hinged to the rotating rod (42); When the telescopic rod of the telescopic cylinder (41) is extended, the rotating rod (42) is pushed to drive the leg support assembly (5) to unfold, and drive the linkage assembly (3) to move in the direction of the leg support assembly (5), so that the leg support assembly (5) and the backrest assembly (2) are adjusted from a sitting position to a TV position and a lying position respectively.

2. The multi-posture sofa frame according to claim 1, characterized in that: The bottom frame (1) comprises two support plates (11) arranged at intervals, a first connecting beam (12) and a second connecting beam (13), wherein the two ends of the first connecting beam (12) are respectively fixedly connected to one end of the two support plates (11) close to the backrest assembly (2), the second connecting beam (13) is arranged at intervals from the first connecting beam (12), the two ends of the second connecting beam (13) are respectively fixedly connected to the inner side walls of the two support plates (11) close to the bottom, and a guide groove (14) is respectively arranged on the inner side walls opposite to each other along the length direction, and the guide groove (14) is inclinedly arranged with a height gradually increasing from the backrest assembly (2) toward the leg support assembly (5).

3. The multi-posture sofa frame according to claim 2, characterized in that: The linkage rod group (32) comprises a leg support linkage rod (321), a first linkage rod (322), a second linkage rod (323), a third linkage rod (324), a bottom frame connecting rod (325) and a sliding rod group (326). The sliding rod group (326) is slidably connected to the guide groove (14). The first linkage rod (322) is movably mounted on the sliding rod group (326). One end of the second linkage rod (323) is hinged to the seat frame plate (31), and the other end is hinged to one end of the first linkage rod (322). The third linkage rod (324) is hinged to the seat frame plate (31). One end of the connecting rod (324) is hinged to one end of the seat frame plate (31) away from the second linkage connecting rod (323); one end of the third linkage connecting rod (324) away from the seat frame plate (31) is hinged to one end of the first linkage connecting rod (322) away from the second linkage connecting rod (323); one end of the leg support linkage rod (321) is hinged to the leg support assembly (5), and the other end is hinged to the second linkage connecting rod (323); one end of the bottom frame connecting rod (325) is hinged to the bottom frame (1), and the other end is hinged to the sliding rod group (326).

4. The multi-posture sofa frame according to claim 3, characterized in that: The sliding rod group (326) includes a first sliding linkage rod (3261), a second sliding linkage rod (3262), and a sliding link (3263). A slider (32631) is provided on the sliding link (3263). The slider (32631) is slidably matched with the guide groove (14). One end of the sliding link (3263) close to the leg support assembly (5) is hinged to the first sliding linkage rod (3261), and the other end of the sliding link (3263) is hinged to one end of the second sliding linkage rod (3262). One end of the first sliding linkage rod (3261) is hinged to the The bottom frame connecting rod (325) is hinged at one end away from the bottom frame (1); the other end of the first sliding linkage rod (3261) is hinged to the first linkage rod (322), and the hinge point is located on the side of the hinge point between the third linkage rod (324) and the first linkage rod (322) away from the second linkage rod (323); the end of the second sliding linkage rod (3262) away from the sliding rod (3263) is hinged to the first linkage rod (322), and the hinge point is located at an end close to the hinge point between the first linkage rod (322) and the second linkage rod (323).

5. The multi-posture sofa frame according to claim 3, characterized in that: The leg support assembly (5) comprises a first leg support link (51), a second leg support link (52), a third leg support link (53), a fourth leg support link (54) and a support assembly (55), wherein the first leg support link (51) is hinged to the seat frame plate (31), one end of the first leg support link (51) is hinged to the leg support linkage rod (321), the other end of the first leg support link (51) is hinged to one end of the second leg support link (52), the second leg support link (52) is hinged to the third leg support link (53), and the fourth leg support link (54) is hinged to the seat frame plate (31). ), one end of the second leg support link (52) away from the first leg support link (51) is hinged to the support assembly (55), one end of the third leg support link (53) is hinged to the seat frame plate (31), and the other end is hinged to the fourth leg support link (54), one end of the fourth leg support link (54) away from the third leg support link (53) is connected to the support assembly (55), and both ends of the rotating rod (42) are respectively fixedly connected to the third leg support link (53) located on both sides of the bottom frame (1).

6. The multi-posture sofa frame according to claim 5, characterized in that: The support assembly (55) comprises a first leg support (551), a second leg support (552) and a third leg support (553); the first leg support (551) is hinged to the fourth leg support link (54); a first support portion (5511) is provided at one end of the first leg support (551) away from the fourth leg support link (54); one end of the first support portion (5511) is hinged to one end of the second leg support link (52) away from the first leg support link (51); The other end of the support portion (5511) is hinged to one end of the third leg support (553), and the end of the third leg support (553) away from the first support portion (5511) is hinged to the second leg support (552), and a second support portion (5521) is provided at one end of the second leg support (552), and the end of the second leg support (552) away from the second support portion (5521) is hinged to the end of the fourth leg support link (54) away from the third leg support link (53).

7. The multi-posture sofa frame according to claim 6, characterized in that: The leg support assembly (5) further comprises a leg support limiter (521) for limiting the rotation of the third leg support link (53) relative to the second leg support link (52); the leg support limiter (521) is arranged on the second leg support link (52) between the hinge points where the second leg support link (52) is connected to the first leg support link (51) and the third leg support link (53), respectively.

8. The multi-posture sofa frame according to claim 7, characterized in that: The backrest assembly (2) comprises a backrest member (21), a first backrest connecting rod (22), a second backrest connecting rod (23) and a backrest linkage rod (24); the first backrest connecting rod (22) is hinged to the seat frame plate (31); the backrest member (21) comprises a connecting portion (211) and an inserting portion (212); one end of the connecting portion (211) is hinged to a free end of the first backrest connecting rod (22); one end of the connecting portion (211) away from the first backrest connecting rod (22) is hinged to one end of the second backrest connecting rod (23); one end of the second backrest connecting rod (23) away from the connecting portion (211) is hinged to the seat frame plate (31); one end of the backrest linkage rod (24) is hinged to the bottom frame (1), and the other end is hinged to the free end of the first backrest connecting rod (22) away from the connecting portion (211).

9. The multi-posture sofa frame according to claim 8, characterized in that: The backrest assembly (2) further comprises a first backrest limiting member (2111) and a second backrest limiting member (231), wherein the first backrest limiting member (2111) is arranged at one end of the connecting portion (211) close to the first backrest connecting rod (22), and the second backrest limiting member (231) is arranged at one end of the second backrest connecting rod (23) close to the connecting portion (211).

10. A multi-posture sofa, characterized by: It comprises a multi-posture sofa frame as described in any one of claims 6 to 9, a sofa backrest (101) installed on the backrest assembly (2), a sofa seat (102) installed on the seat frame plate (31), a first leg support plate (103) installed on the first leg support (551), and a second leg support plate (104) installed on the second leg support (552).

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