Sofa frame capable of stretching through single motor

Abstract

The utility model discloses a single motor stretching sofa frame in the field of sofa frames, which comprises a base assembly, a cushion assembly, a telescopic assembly, a frame leg assembly and a backrest assembly, the base assembly comprises two symmetrically arranged connecting side plates and a first cross rod, two ends of the first cross rod are respectively connected with a first rotating rod, and the first rotating rod is connected with a second rotating rod; one end of each first rotating rod is hinged to the corresponding connecting side plate, the other end of each first rotating rod is hinged to the cushion assembly, the frame leg assembly is hinged to the cushion assembly, and the frame leg assembly is hinged to the backrest assembly through a linkage rod; the telescopic assembly comprises a single motor, the driving end of the single motor is hinged to the first cross rod, and the single motor drives a first rotating rod to rotate through the first cross rod, so that the backrest assembly and the frame leg assembly are switched between a lying posture state and a sitting posture state; when the leg supporting assembly is in the lying posture state, the height of the side, away from the telescopic assembly, of the leg supporting assembly is larger than that of the cushion assembly, all the assemblies do not need to be operated respectively, and operation is easy.

Description

Technical Field

[0001] This utility model relates to the field of sofa frame technology, specifically to a sofa frame with a single motor extension. Background Technology

[0002] In today's fast-paced life, people are paying more and more attention to the practicality and comfort of home furnishings. As an important piece of furniture for daily leisure, the versatility of sofa functions and ease of use have become important factors for consumers when making a purchase. Traditional sofas have a relatively fixed form, only meeting basic sitting needs, and are unlikely to provide a variety of comfortable experiences such as lying down when people want to relax and rest.

[0003] To meet users' growing demand for comfort and relaxation, extendable sofas are gradually gaining popularity. These sofas, through clever structural design, can change their shape to accommodate various postures such as sitting, lying down, and reclining, providing users with a completely new home experience. However, some adjustable sofas employ complex multi-component independent adjustment methods. Each component operates independently, requiring separate operation during adjustment. This is not only cumbersome but also makes it difficult for the components to coordinate effectively, significantly reducing the overall flexibility of the structure.

[0004] The above-mentioned defects urgently need to be addressed. Utility Model Content

[0005] To address the problem of cumbersome operation caused by the complex multi-component independent adjustment method used in existing partially adjustable sofas, this utility model provides a sofa frame with a single motor extension.

[0006] The technical solution of this utility model is as follows:

[0007] A single-motor extendable sofa frame includes a base assembly, a seat cushion assembly, a telescopic assembly, a leg assembly, and a backrest assembly. The base assembly includes two symmetrically arranged connecting side plates and a first crossbar. Both ends of the first crossbar are connected to a first rotating rod, and one end of the first rotating rod is hinged to the corresponding connecting side plate. The other end of the first rotating rod is hinged to the seat cushion assembly. The leg assembly is hinged to the seat cushion assembly, and the leg assembly is hinged to the backrest assembly via a linkage rod.

[0008] The telescopic component includes a single motor, the drive end of which is hinged to the first crossbar. The single motor drives the first rotating rod to rotate through the first crossbar, so that the backrest component and the leg support component can switch between a reclining state and a sitting state.

[0009] When the leg support assembly is in a lying position, the height of the side of the leg support assembly away from the telescopic assembly is greater than the height of the seat cushion assembly.

[0010] According to the present utility model with the above solution, the seat cushion assembly is provided with a first limiting post, and the backrest assembly is provided with a limiting groove. When the backrest assembly is extended to a preset angle, the limiting groove engages with the first limiting post.

[0011] According to the present utility model of the above-described scheme, the base assembly further includes a second rotating rod, one end of which is hinged to the seat cushion assembly, and the other end of which is hinged to the connecting side plate. The seat cushion assembly is provided with a second limiting post. When the leg assembly is in a sitting position, the second rotating rod abuts against the second limiting post.

[0012] According to the present utility model of the above-described scheme, the single motor includes a drive rod, a drive block is provided on the drive rod, and L-shaped connecting pieces are respectively provided on both sides of the drive block. One end of the L-shaped connecting piece is hinged to the drive block, and the other end of the L-shaped connecting piece is connected to the first crossbar.

[0013] According to the present utility model of the above-described scheme, the base assembly further includes a connecting horizontal plate, a bottom plate, and a rotating shaft. The two ends of the connecting horizontal plate are respectively connected to the two connecting side plates. A connecting part is provided on the bottom plate. The bottom of the rotating shaft is rotatably connected to the connecting part, and the top of the rotating shaft is rotatably connected to the connecting horizontal plate. The rotating shaft is located below one of the L-shaped connecting pieces.

[0014] According to the present invention based on the above solution, a limiting component is provided on the rotating shaft. The limiting component includes a limiting sleeve, a locking disc, and an abutment disc. The limiting sleeve is disposed on the top of the connecting part and sleeved on the upper side of the rotating shaft. The locking disc is disposed between the limiting sleeve and the connecting part. The abutment disc is disposed on the top of the limiting sleeve. A plurality of insertion posts are provided at the bottom of the abutment disc. When the backrest assembly extends to a preset angle, the L-shaped connecting piece abuts against the abutment disc, and the plurality of insertion posts are inserted into the locking disc to prevent the connecting cross plate from rotating relative to the bottom plate.

[0015] According to the present utility model of the above-described scheme, the limiting component further includes a positioning frame, which is disposed below the abutment plate and sleeved on the outside of the limiting sleeve. The positioning frame is provided with a plurality of first positioning holes corresponding one-to-one with the insertion post. The connecting horizontal plate is provided with a plurality of second positioning holes, and the locking plate is provided with a plurality of locking holes. When the backrest component extends to a preset angle, the insertion post sequentially passes through the corresponding first positioning hole, the corresponding second positioning hole, and the corresponding locking hole and is inserted into the corresponding locking hole. An elastic element is sleeved on the insertion post.

[0016] According to the present utility model with the above-described scheme, the base assembly further includes a second crossbar, the two ends of which are respectively disposed on two connecting side plates, and the first crossbar and the second crossbar are spaced apart, and the fixed end of the single motor is connected to the second crossbar.

[0017] According to the present invention based on the above solution, the leg assembly includes two symmetrically arranged leg rod groups. Each leg rod group includes a mounting rod, a first connecting rod, a second connecting rod, a third connecting rod, a first leg rod, a second leg rod, a fourth connecting rod, a fifth connecting rod, and a sixth connecting rod. The mounting rod is connected to the seat cushion assembly. One end of the first connecting rod is hinged to the connecting side plate, and the other end of the first connecting rod is hinged to the second connecting rod. The end of the second connecting rod closest to the first connecting rod is hinged to the mounting rod, and the linkage rod is connected to the second connecting rod. The second link is hinged to one end of the third link at the end furthest from the first link, and the other end of the third link is hinged to one end of the first leg rod. The other end of the first leg rod is hinged to the second leg rod. One end of the fourth link is hinged to the mounting rod, and the other end of the fourth link is hinged to one end of the fifth link. The fourth link is also hinged to the third link. The other end of the fifth link is hinged to one end of the sixth link, and the other end of the sixth link is hinged to the second leg rod.

[0018] According to the present invention based on the above scheme, when the leg assembly is in a lying position, in the orthographic projection direction, the orthographic projection of the third link overlaps with the orthographic projection of the fifth link, and there is no gap between the orthographic projection of the third link and the orthographic projection of the fifth link.

[0019] The advantages of this utility model based on the above solution are as follows:

[0020] In the aforementioned single-motor extended sofa frame, the seat cushion assembly, base assembly, backrest assembly, and leg assembly are connected by a first crossbar, a first rotating rod, and a linkage rod to form a linkage structure. The single motor drives the first crossbar to move, the first crossbar drives the first rotating rod to rotate, and the first rotating rod then drives the seat cushion assembly to move, thereby causing the seat cushion assembly to extend the leg assembly. The leg assembly, through the linkage rod, drives the backrest assembly to move, thus achieving synchronous movement of the backrest assembly and leg assembly under the drive of a single motor. That is, each component works in coordination, without the need to operate each component separately, making operation simple and ensuring the continuity and smoothness of the overall movement.

[0021] In addition, the single motor drives the first rotating rod to rotate through the first crossbar, making the power transmission smoother and ensuring the movement stability of the backrest assembly and the leg assembly during the extension and retraction process.

[0022] In addition, when the leg support assembly is in a reclining position, the height of the side away from the telescopic assembly is greater than the height of the seat cushion assembly, which can better support the user's legs, allowing the body to be in a more natural and comfortable posture when lying down, reducing pressure on the waist and legs, and improving the comfort of lying down. Attached Figure Description

[0023] Figure 1 This is one of the structural schematic diagrams of the present invention in a lying position;

[0024] Figure 2 This is a front view of the present invention in a lying position;

[0025] Figure 3 This is the second structural schematic diagram of the present invention in a lying position;

[0026] Figure 4 for Figure 3 Enlarged view of section A;

[0027] Figure 5 for Figure 3 Enlarged view of section B;

[0028] Figure 6 This is the third structural schematic diagram of the present invention in a lying position;

[0029] Figure 7 for Figure 6 Enlarged view of section C;

[0030] Figure 8 This is one of the structural schematic diagrams of the present invention in a seated position;

[0031] Figure 9 This is the second structural schematic diagram of the present invention in a seated position;

[0032] Figure 10 for Figure 9 Enlarged view of section D;

[0033] Figure 11 This is a structural diagram of the base assembly;

[0034] Figure 12 This is a breakdown diagram of the limit component;

[0035] Figure 13 This is a partial structural diagram of the limiting component;

[0036] Figure 14 This is a structural schematic diagram of the telescopic component;

[0037] Figure 15 This is a structural schematic diagram of the support leg assembly.

[0038] In the diagram, 1. Base assembly; 11. Connecting side plate; 12. First crossbar; 13. First rotating rod; 14. Second rotating rod; 15. Connecting crossbar; 16. Base plate; 161. Connecting part; 17. Rotating shaft; 18. Limiting assembly; 181. Limiting sleeve; 182. Locking plate; 1821. Locking hole; 183. Abutment plate; 184. Insertion post; 185. Positioning frame; 1851. First positioning hole; 186. Elastic element;

[0039] 2. Seat cushion assembly; 21. First limiting post; 22. Second limiting post;

[0040] 3. Telescopic assembly; 31. Single motor; 32. Drive rod; 33. Drive block; 34. L-shaped connecting piece;

[0041] 4. Leg assembly; 41. Leg rod assembly; 411. Mounting rod; 412. First link; 413. Second link; 414. Third link; 415. First leg rod; 416. Second leg rod; 417. Fourth link; 418. Fifth link; 419. Sixth link;

[0042] 5. Backrest assembly; 51. Limiting groove;

[0043] 6. Linkage rod. Detailed Implementation

[0044] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0045] like Figure 1 As shown, this utility model provides a sofa frame with a single motor extension, including a base assembly 1, a seat cushion assembly 2, a telescopic assembly 3, a leg assembly 4, and a backrest assembly 5. The base assembly 1 includes two symmetrically arranged connecting side plates 11 and a first crossbar 12. The two ends of the first crossbar 12 are respectively connected to a first rotating rod 13, and one end of the first rotating rod 13 is hinged to the corresponding connecting side plate 11. The other end of the first rotating rod 13 is hinged to the seat cushion assembly 2. The leg assembly 4 is hinged to the seat cushion assembly 2 and to the backrest assembly 5 via a linkage rod 6. The telescopic assembly 3 includes a single motor 31. The driving end of the single motor 31 is hinged to the first crossbar 12. The single motor 31 drives the first rotating rod 13 to rotate via the first crossbar 12, so that the backrest assembly 5 and the leg assembly 4 can switch between a reclining state and a sitting state. Driven by a single motor 31, the backrest assembly 5 and the leg assembly 4 move synchronously, enabling the sofa to quickly and smoothly switch between different states such as sitting, standing, and lying down, providing users with a more comfortable and convenient user experience.

[0046] like Figure 3 As shown, in this embodiment, the seat cushion assembly 2, base assembly 1, backrest assembly 5, and leg support assembly 4 are connected by a first crossbar 12, a first rotating rod 13, and a linkage rod 6 to form a linkage structure. A single motor 31 drives the first crossbar 12 to move, which in turn drives the first rotating rod 13 to rotate. The first rotating rod 13 then drives the seat cushion assembly 2 to move, thereby causing the seat cushion assembly 2 to extend the leg support assembly 4. The leg support assembly 4, through the linkage rod 6, drives the backrest assembly 5 to move, thus achieving synchronous movement of the backrest assembly 5 and the leg support assembly 4 driven by the single motor 31. That is, each component works in coordination, eliminating the need to operate each component separately, simplifying operation and ensuring the continuity and smoothness of the overall movement. In addition, the single motor 31 drives the first rotating rod 13 to rotate through the first crossbar 12, making the power transmission more stable and ensuring the movement stability of the backrest assembly 5 and the leg support assembly 4 during extension and retraction.

[0047] like Figure 2 As shown in this embodiment, when the leg support assembly 4 is in a lying position, the height of the side of the leg support assembly 4 away from the telescopic assembly 3 is greater than the height of the seat cushion assembly 2, which can better support the user's legs, so that the body is in a more natural and comfortable posture when lying down, reducing the pressure on the waist and legs, and improving the comfort of lying down.

[0048] In this embodiment, when both the leg assembly 4 and the backrest assembly 5 are extended to a preset angle, the sofa is in a zero-gravity posture. This allows the user's knees and heart to be roughly on the same horizontal plane when lying down, increasing the pressure area on the body and ensuring that all parts of the body receive even pressure without feeling oppressive. Specifically, the angle between the backrest assembly 5 and the seat cushion assembly 2 can be designed to be 137°. Of course, in actual design, the angle between the backrest assembly 5 and the seat cushion assembly 2 can be designed according to actual needs to meet the requirements of zero gravity.

[0049] like Figure 3 , Figure 4As shown, in this embodiment, the seat cushion assembly 2 is provided with a first limiting post 21, and the backrest assembly 5 is provided with a limiting groove 51. When the backrest assembly 5 extends to a preset angle, the limiting groove 51 engages with the first limiting post 21. During sofa use, if the backrest assembly 5 extends excessively, it may cause the user to lose balance and fall backward, especially for the elderly, children, and other people with weaker balance abilities, posing a significant safety hazard. The engaging design of the limiting groove 51 and the first limiting post 21 can precisely limit the extension range of the backrest assembly 5. When the preset angle is reached, the two engage to prevent the backrest from extending further backward, avoiding the danger caused by overextension and providing a safer usage environment for the user. In addition, after the limiting groove 51 engages with the first limiting post 21, it can enhance the stability of the backrest assembly 5, resist certain external force interference, prevent the backrest from suddenly moving and causing injury to the user, and ensure the safety of the user when resting or moving around on the sofa.

[0050] like Figure 3 , Figure 5 As shown, in this embodiment, the base assembly 1 further includes a second rotating rod 14. One end of the second rotating rod 14 is hinged to the seat cushion assembly 2, and the other end of the second rotating rod 14 is hinged to the connecting side plate 11. The leg assembly 4 is also hinged to the seat cushion assembly 2. A single motor 31 drives the first crossbar 12 to move, and the first crossbar 12 drives the first rotating rod 13 to rotate. The first rotating rod 13 then drives the seat cushion assembly 2 to move, thereby causing the seat cushion assembly 2 to drive the second rotating rod 14 to rotate, realizing the extension and retraction of the leg assembly 4, thus enabling the leg assembly 4 to switch between a reclining state and a sitting state. At the same time, the leg assembly 4 drives the backrest assembly 5 to move through the linkage rod 6, enabling the backrest assembly 5 to switch between a reclining state and a sitting state.

[0051] like Figure 3 , Figure 5 As shown, in this embodiment, the seat cushion assembly 2 is provided with a second limiting post 22. When the leg assembly 4 retracts to a preset angle, that is, when the leg assembly 4 is in a sitting position, the second rotating rod 14 abuts against the second limiting post 22, which plays a limiting role, preventing the leg assembly 4 from retracting excessively, ensuring that the leg assembly 4 moves within a reasonable range, and maintaining the stability of the sofa structure.

[0052] like Figure 11 , Figure 14As shown, in this embodiment, the single motor 31 includes a drive rod 32, a drive block 33 is provided on the drive rod 32, and L-shaped connecting pieces 34 are respectively provided on both sides of the drive block 33. One end of the L-shaped connecting piece 34 is hinged to the drive block 33, and the other end of the L-shaped connecting piece 34 is connected to the first crossbar 12. After the single motor 31 is started, the drive rod 32 drives the drive block 33 to move, so that the L-shaped connecting piece rotates around its hinge point with the drive block 33, thereby smoothly transmitting the movement of the drive block 33 to the first crossbar 12, so that the first crossbar 12 drives the seat cushion assembly 2 to rotate through the first rotating rod 13. At the same time, the leg assembly 4 is hinged to the seat cushion assembly 2, and the leg assembly 4 drives the backrest assembly 5 to move through the linkage rod 6, thereby realizing the extension and retraction operation of the sofa frame backrest assembly 5 and the leg assembly 4. The power transmission efficiency is high and accurate. In addition, the L-shaped connecting piece design increases the contact area and connection strength between the drive block 33 and the first crossbar 12, which can better withstand and transmit the power generated by the single motor 31. Compared with direct connection or simple transmission structure, it can reduce the loss of power in the transmission process, so that the power of the single motor 31 can be applied to each component of the sofa frame more effectively, ensuring that the sofa frame moves smoothly when switching between different states.

[0053] like Figure 11 As shown, in this embodiment, the base assembly 1 further includes a connecting horizontal plate 15, a base plate 16, and a rotating shaft 17. The two ends of the connecting horizontal plate 15 are respectively connected to two connecting side plates 11, forming a stable frame structure and enhancing the overall rigidity of the base assembly 1. A connecting part 161 is provided on the base plate 16. The bottom of the rotating shaft 17 is inserted into and rotatably connected to the connecting part 161. The top of the rotating shaft 17 is rotatably connected to the connecting horizontal plate 15, and the rotating shaft 17 is located below one of the L-shaped connecting pieces 34. When the sofa is subjected to pressure from the user or other external forces, the rotating shaft 17 can act as a stable support point, transmitting the force from the connecting horizontal plate 15 to the base plate 16. Furthermore, the connecting horizontal plate 15 can rotate around the rotating shaft 17, allowing the sofa cushion to rotate at a certain angle. Users can flexibly adjust the sofa's orientation according to their needs and usage scenarios.

[0054] like Figures 6 to 13As shown, in this embodiment, a limiting component 18 is provided on the rotating shaft 17. The limiting component 18 includes a limiting sleeve 181, a locking plate 182, and an abutment plate 183. The limiting sleeve 181 is located on the top of the connecting part 161 and is sleeved on the upper side of the rotating shaft 17. The locking plate 182 is located between the limiting sleeve 181 and the connecting part 161. The abutment plate 183 is located on the top of the limiting sleeve 181. Several insertion posts 184 are provided at the bottom of the abutment plate 183. When the backrest assembly 5 is extended to a preset angle, the L-shaped connecting piece 34 abuts against the abutment plate 183, and the several insertion posts 184 are inserted into the locking plate 182 to prevent the connecting horizontal plate 15 and the bottom plate 16 from rotating relative to each other. That is, when the backrest assembly 5 is in a reclining position, the connecting horizontal plate 15 and the bottom plate 16 do not rotate relative to each other, avoiding safety accidents caused by accidental rotation of the sofa and providing a safer usage environment for users. In addition, it can provide users with clear feedback, letting them know that the sofa has reached the right position and been fixed, making the operation simpler and easier to understand, without the need for additional judgment and adjustment, thus improving the convenience of use.

[0055] like Figures 6 to 13 As shown, in this embodiment, the limiting component 18 further includes a positioning frame 185. The positioning frame 185 is located below the abutment plate 183 and is sleeved on the outside of the limiting sleeve 181. The positioning frame 185 is provided with a plurality of first positioning holes 1851 corresponding one-to-one with the insertion post 184. The connecting horizontal plate 15 is provided with a plurality of second positioning holes, and the locking plate 182 is provided with a plurality of locking holes 1821. When the backrest component 5 is extended to a preset angle, the insertion post 184 passes through the corresponding first positioning hole 1851, the corresponding second positioning hole and the corresponding locking hole 1821 in sequence and is inserted, thereby preventing the connecting horizontal plate 15 and the base plate 16 from rotating relative to each other. This prevents the seat cushion component 2 from rotating, so that after the user adjusts to a comfortable sitting or lying position, the sofa can stably maintain this state and will not change its angle or position due to slight movements or external interference, providing the user with a continuous and stable comfortable experience. Furthermore, during sofa use, especially when the backrest is extended and the user is lying down, if the seat cushion component 2 suddenly rotates, it may cause the user to lose balance and fall, posing a significant safety hazard. The limiting component 18 ensures the safety of the user's activities on the sofa, especially for the elderly, children, and people with mobility impairments, increasing their sense of security when using the sofa.

[0056] like Figure 13As shown, in this embodiment, an elastic element 186 is sleeved on the insertion post 184. The elastic element 186 can be designed as a spring. When the backrest assembly 5 changes from a reclining state to a sitting state, the insertion post 184, which was originally inserted into the various positioning holes and locking holes 1821, needs to be pulled out. When the insertion post 184 is inserted into the locking hole 1821 on the locking plate 182, the spring is compressed, thereby undergoing elastic deformation. When the insertion post 184 is pulled out from the locking hole 1821 on the locking plate 182, the spring releases energy to restore its deformation, quickly pulling the insertion post 184 back to its initial position. This eliminates the need for manual operation, greatly simplifying the steps of adjusting the sofa's state, saving time and effort, and allowing users to change the sofa's usage mode more easily and quickly. In addition, the spring's buffering effect can reduce wear between the plug post 184 and the first positioning hole 1851, the second positioning hole, and the locking hole 1821. When the spring is under force, it absorbs some energy, reducing the direct force between the plug post 184 and the hole wall, thereby reducing wear and extending the service life of each component.

[0057] like Figure 3 , Figure 11 As shown, in this embodiment, the base assembly 1 also includes a second crossbar. The two ends of the second crossbar are respectively mounted on two connecting side plates 11, forming a more stable frame structure together with the connecting side plates 11, enhancing the overall rigidity and strength of the base assembly 1. Furthermore, the first crossbar 12 and the second crossbar are spaced apart. When the single motor 31 operates, the generated power and reaction force are transmitted to the connecting side plates 11 through the second crossbar, and then distributed throughout the entire base structure by the connecting side plates 11. This avoids excessive local stress, reduces the risk of component damage due to long-term concentrated stress, and extends the sofa's lifespan. Additionally, the fixed end of the single motor 31 is connected to the second crossbar, allowing the single motor 31 to maintain a stable position during operation. This helps the single motor 31 accurately transmit power to the first crossbar 12, thereby driving the first rotating rod 13 to rotate, realizing the extension and retraction of the backrest assembly 5 and the leg assembly 4.

[0058] like Figure 15As shown, in this embodiment, the leg support assembly 4 includes two symmetrically arranged leg support rod groups 41. Each leg support rod group 41 includes a mounting rod 411, a first connecting rod 412, a second connecting rod 413, a third connecting rod 414, a first leg support rod 415, a second leg support rod 416, a fourth connecting rod 417, a fifth connecting rod 418, and a sixth connecting rod 419. The mounting rod 411 is connected to the seat cushion assembly 2. One end of the first connecting rod 412 is hinged to the connecting side plate 11, and the other end of the first connecting rod 412 is hinged to the second connecting rod 413. The end of the second connecting rod 413 closest to the first connecting rod 412 is hinged to the mounting rod 411, and the linkage rod 6 is connected to... The second link 413 is hinged, and the end of the second link 413 away from the first link 412 is hinged to one end of the third link 414. The other end of the third link 414 is hinged to one end of the first leg 415. The other end of the first leg 415 is hinged to the second leg 416. One end of the fourth link 417 is hinged to the mounting rod 411. The other end of the fourth link 417 is hinged to one end of the fifth link 418, and the fourth link 417 is also hinged to the third link 414. The other end of the fifth link 418 is hinged to one end of the sixth link 419, and the other end of the sixth link 419 is hinged to the second leg 416. During operation, the single motor 31 drives the seat cushion assembly 2, which in turn drives the second link 413, the third link 414, the first leg rod 415, the second leg rod 416, the fourth link 417, the fifth link 418, and the sixth link 419 to work together, thereby extending or retracting the leg rod assembly 41. The leg assembly 4 consists of a complex linkage structure composed of multiple links. When the user places their legs on the legs, the weight and pressure of the body are distributed and transmitted through the links, avoiding excessive force at a single point. This allows the entire leg assembly 4 to more stably support the weight of the body, reducing the risk of damage to components due to excessive localized force and extending the lifespan of the sofa. In addition, using two leg rods extends the stress points of the legs and improves the stability of the leg assembly 4.

[0059] like Figure 2 , Figure 15 As shown, in this embodiment, when the leg assembly 4 is in a reclining position, that is, when the leg assembly 4 is extended to a predetermined angle, the orthographic projection of the third link 414 overlaps with the orthographic projection of the fifth link 418 in the orthographic projection direction, and there is no gap between the orthographic projections of the third link 414 and the fifth link 418, which plays a protective role and prevents hand or foot injuries. During daily sofa use, especially when children or elderly people with mobility issues are present, they may inadvertently place their hands or feet near the leg assembly 4. When the leg assembly 4 is in a reclining position, the orthographic projections of the third link 414 and the fifth link 418 overlap without gaps, providing a safe and reliable usage environment for the user.

[0060] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

[0061] The present utility model patent has been described above with reference to the accompanying drawings. Obviously, the implementation of the present utility model patent is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present utility model patent, or the direct application of the inventive concept and technical solution of the present utility model patent to other occasions without modification, are all within the protection scope of the present utility model.

Claims

1. A single motor extended sofa frame, characterized in that, The base assembly, the seat cushion assembly, the telescopic assembly, the legrest assembly and the backrest assembly, the base assembly comprises two symmetrically arranged connecting side plates, a first horizontal rod, the two ends of the first horizontal rod are respectively connected with a first rotating rod, one end of the first rotating rod is hinged with the corresponding connecting side plate, the other end of the first rotating rod is hinged with the seat cushion assembly, the legrest assembly is hinged with the seat cushion assembly, the legrest assembly is hinged with the backrest assembly through a linkage rod; The telescopic assembly comprises a single motor, the driving end of the single motor is hinged with the first horizontal rod, the single motor drives the first rotating rod to rotate through the first horizontal rod, so that the backrest assembly and the legrest assembly are switched between the lying position and the sitting position; When the legrest assembly is in the lying position, the height of the side of the legrest assembly away from the telescopic assembly is greater than the height of the seat cushion assembly.

2. The single motor extended sofa frame of claim 1, wherein, The seat cushion assembly is provided with a first limiting column, and the backrest assembly is provided with a limiting groove, when the backrest assembly is stretched to a preset angle, the limiting groove is clamped with the first limiting column.

3. The single motor extended sofa frame of claim 1, wherein, The base assembly further comprises a second rotating rod, one end of the second rotating rod is hinged with the seat cushion assembly, the other end of the second rotating rod is hinged with the connecting side plate, the seat cushion assembly is provided with a second limiting column, when the legrest assembly is in the sitting position, the second rotating rod abuts against the second limiting column.

4. The single motor extended sofa frame of claim 1, wherein, The single motor comprises a driving rod, the driving rod is provided with a driving block, the two sides of the driving block are respectively provided with L-shaped connecting plates, one end of the L-shaped connecting plate is hinged with the driving block, the other end of the L-shaped connecting plate is connected with the first horizontal rod.

5. The single motor extended sofa frame of claim 4, wherein, The base assembly further comprises a connecting horizontal plate, a bottom plate and a rotating shaft, the two ends of the connecting horizontal plate are respectively connected with two connecting side plates, the bottom plate is provided with a connecting part, the bottom of the rotating shaft is rotationally connected with the connecting part, the top of the rotating shaft is rotationally connected with the connecting horizontal plate, and the rotating shaft is arranged below one of the L-shaped connecting plates.

6. The single motor extended sofa frame of claim 5, wherein, The rotating shaft is provided with a limiting assembly, the limiting assembly comprises a limiting sleeve, a locking disc and an abutting disc, the limiting sleeve is arranged on the top of the connecting part and is sleeved on the upper side of the rotating shaft, the locking disc is arranged between the limiting sleeve and the connecting part, the abutting disc is arranged on the top of the limiting sleeve, the bottom of the abutting disc is provided with a plurality of insertion columns, when the backrest assembly is stretched to a preset angle, the L-shaped connecting plate abuts against the abutting disc, and a plurality of the insertion columns are inserted with the locking disc to prevent the relative rotation of the connecting horizontal plate and the bottom plate.

7. The single motor extended sofa frame of claim 6, wherein, The limiting assembly further comprises a positioning frame arranged below the abutting disc and sleeved outside the limiting sleeve, a plurality of first positioning holes corresponding to the inserting columns are arranged on the positioning frame, a plurality of second positioning holes corresponding to the connecting horizontal plate are arranged on the connecting horizontal plate, and a plurality of locking holes corresponding to the locking disc are arranged on the locking disc, when the backrest assembly is stretched to a preset angle, the inserting columns are sequentially inserted through the corresponding first positioning holes, the corresponding second positioning holes and the corresponding locking holes, and the elastic members are sleeved on the inserting columns.

8. The single motor extended sofa frame of claim 1, wherein, The base assembly further comprises a second horizontal rod, two ends of the second horizontal rod are arranged on the two connecting side plates respectively, and the first horizontal rod and the second horizontal rod are arranged at intervals, and the fixed end of the single motor is connected with the second horizontal rod.

9. The single motor extended sofa frame of claim 1, wherein, The leg assembly comprises two symmetrically arranged leg rod groups, the leg rod group comprises a mounting rod, a first connecting rod, a second connecting rod, a third connecting rod, a first leg rod, a second leg rod, a fourth connecting rod, a fifth connecting rod and a sixth connecting rod, the mounting rod is connected with the cushion assembly, one end of the first connecting rod is hingedly connected with the connecting side plate, the other end of the first connecting rod is hingedly connected with the second connecting rod, one end of the second connecting rod close to the first connecting rod is hingedly connected with the mounting rod, and the linkage rod is hingedly connected with the second connecting rod, one end of the second connecting rod away from the first connecting rod is hingedly connected with one end of the third connecting rod, the other end of the third connecting rod is hingedly connected with one end of the first leg rod, the other end of the first leg rod is hingedly connected with the second leg rod, one end of the fourth connecting rod is hingedly connected with the mounting rod, the other end of the fourth connecting rod is hingedly connected with one end of the fifth connecting rod, and the fourth connecting rod is hingedly connected with the third connecting rod, the other end of the fifth connecting rod is hingedly connected with one end of the sixth connecting rod, and the other end of the sixth connecting rod is hingedly connected with the second leg rod.

10. The single-motor extended sofa frame of claim 9, wherein, When the leg assembly is in a lying state, in the orthographic projection direction, the orthographic projection of the third connecting rod overlaps with the orthographic projection of the fifth connecting rod, and there is no gap between the orthographic projection of the third connecting rod and the orthographic projection of the fifth connecting rod.

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