Lifting and rotating frames for a backrest, as well as furniture with the same

Abstract

Lifting and rotating frame for a backrest, including: a support frame; a lifting mechanism arranged on the support frame, comprising a lifting assembly; and a rotary mechanism mounted on the lifting assembly which, together with the lifting assembly, can perform a lifting movement, wherein the rotary mechanism comprises a rotary structure and the rotary structure comprises a first fastening element, a rotary drive assembly and a rotary mounting assembly; wherein the rotary drive assembly and the rotary mounting assembly are mounted on the lifting assembly via the first fastening element; the first fastening element is provided with a first rotary section and a second rotary section, one end of the rotary drive assembly is rotatably connected to the first rotary section and one end of the rotary mounting assembly is rotatably connected to the second rotary section; a connecting line between the first rotary section and the second rotary section forms an angle with both the rotary drive assembly and the rotary mounting assembly; and an end of the rotary drive assembly facing away from the first fastening element is rotatably connected to an end of the rotary mounting assembly facing away from the first fastening element.

Description

AREA OF INVENTION

[0001] The present application relates to the technical field of furniture and in particular to a lifting and rotating frame for a backrest and a piece of furniture with the same. BACKGROUND OF THE INVENTION

[0002] As quality of life improves, the demands placed on household items like sofas also increase. To accommodate different users, existing sofas generally feature a backrest designed as an adjustable lifting mechanism, allowing for height adjustments depending on actual usage needs. Similarly, a headrest can support and protect the head when people are resting on a seat or sofa, providing cushioning and enhancing comfort. An ergonomically designed headrest can conform well to the human head and neck, not only effectively supporting the head and neck but also significantly helping to alleviate physical fatigue. Maintaining a particular posture for extended periods can easily lead to muscle fatigue in the head and neck area, which is detrimental to overall relaxation.Adjustable headrests improve this disadvantage; by adjusting the height and angle of the headrest, comfort for the head and neck can be improved.

[0003] In current technology, the angle of the headrest can be adjusted manually, but this requires manual intervention for each adjustment, which is inconvenient. Electrically adjustable headrests, on the other hand, allow for more flexible adjustments and offer greater ease of use. However, existing electrically adjustable headrests generally have complex structures, and problems such as jamming can occur during the adjustment process, causing some inconvenience in operation and maintenance. Furthermore, the adjustments of the headrest and backrest are usually separate. If the headrest could support both the back and the head and neck, and its angle could be adjusted according to actual usage needs, this would not only simplify operation and increase comfort but also make the internal design more compact.

[0004] Therefore, there is a need to provide a lifting and rotating frame for a backrest that has a simple design, is easy to use, and facilitates adjustment. SUMMARY OF THE INVENTION

[0005] The purpose of the present application is to provide a lifting and rotating frame for a backrest that has a simple design, is easy to use and facilitates adjustment.

[0006] Another purpose of the present application is to provide furniture that is simple and convenient to use, comfortable to operate, and able to effectively support the back, head, and neck.

[0007] To achieve the aforementioned purposes, the present application provides a lifting and rotating frame for a backrest, comprising: a support frame; a lifting mechanism arranged on the support frame, comprising a lifting assembly; and a rotary mechanism mounted on the lifting assembly which, together with the lifting assembly, can perform a lifting movement, wherein the rotary mechanism comprises a rotary structure and the rotary structure comprises a first fastening element, a rotary drive assembly and a rotary mounting assembly; wherein the rotary drive assembly and the rotary mounting assembly are mounted on the lifting assembly via the first fastening element; the first fastening element is provided with a first rotary section and a second rotary section, one end of the rotary drive assembly is rotatably connected to the first rotary section and one end of the rotary mounting assembly is rotatably connected to the second rotary section; a connecting line between the first rotary section and the second rotary section forms an angle with both the rotary drive assembly and the rotary mounting assembly; and an end of the rotary drive assembly facing away from the first fastening element is rotatably connected to an end of the rotary mounting assembly facing away from the first fastening element.

[0008] In contrast to the prior art, the lifting and rotating frame for a backrest of the present application can be automatically lifted and rotated, has a simple design, and is easy to operate. The lifting and rotating frame for a backrest comprises a support frame, a lifting mechanism, and a rotating mechanism. The lifting mechanism is arranged on the support frame and includes a lifting assembly capable of performing a lifting movement. The rotating mechanism is mounted on the lifting assembly and can perform a lifting movement together with the lifting assembly. The rotating mechanism comprises a rotating structure, the rotating structure comprising a first fastening element, a rotary drive assembly, and a rotary mounting assembly. The rotary drive assembly and the rotary mounting assembly are mounted to the lifting assembly via the first fastening element, and the first fastening element is attached to the lifting assembly.The first fastening element is provided with a first rotary section and a second rotary section. One end of the rotary drive assembly is rotatably connected to the first rotary section, and one end of the rotary mounting assembly is rotatably connected to the second rotary section. A connecting line between the first rotary section and the second rotary section forms an angle with both the rotary drive assembly and the rotary mounting assembly. Furthermore, an end of the rotary drive assembly opposite the first fastening element is rotatably connected to an end of the rotary mounting assembly opposite the first fastening element. That is, the connecting line between the first rotary section and the second rotary section, together with the rotary drive assembly and the rotary mounting assembly, forms a triangle.The first mounting element is fixed, so the line connecting the first and second rotary sections remains constant. The rotary drive assembly is actuated to change its length, thereby rotating both the rotary drive assembly and the rotary mounting assembly relative to the first mounting element. This changes both the angle between the line connecting the first and second rotary sections and the rotary drive assembly, and the angle between said line and the rotary mounting assembly. The resulting triangular structure is stable and reliable, and its overall structure does not change arbitrarily when the rotary drive assembly is not actuated. Therefore, the lifting and rotating frame for a backrest of the present application can be automatically raised and rotated, exhibits a stable and reliable overall structure, and is simple and convenient to operate.

[0009] Preferably, the rotary assembly comprises a rotating element and a rotating shaft, and one end of the rotating element is rotatably connected to the second rotating section via the rotating shaft.

[0010] Preferably, the first fastening element is provided with a guide pin that interacts with the rotary element, and an end of the rotary element adjacent to the rotary shaft is provided with a guide section that interacts with the guide pin, the rotary drive assembly being actuated to rotate the guide section along the guide pin.

[0011] Preferably, a first locking groove and a second locking groove are provided in the guide section, wherein the guide pin is arranged in the first locking groove to set a first predetermined angle between the rotary structure and the lifting assembly, and the guide pin is arranged in the second locking groove to set a second predetermined angle between the rotary structure and the lifting assembly, and the rotary drive assembly is actuated to rotate the rotary structure relative to the lifting assembly within a range between the first predetermined angle and the second predetermined angle.

[0012] Preferably, the rotary drive assembly comprises a rotary drive element and a telescopic rod, wherein one end of the telescopic rod is connected to an output end of the rotary drive element and can perform a telescopic movement within the rotary drive element, and the other end of the telescopic rod is connected to the first rotary section via a first rotary shaft, wherein the rotary drive element drives the telescopic rod to a telescopic movement, so that the telescopic rod rotates about the first rotary shaft and thereby drives the rotary assembly to rotate.

[0013] Preferably, the rotary element is provided with a receiving groove and a mounting section, wherein the mounting section projects from one or both sides of the receiving groove, and the rotary drive element is mounted in the receiving groove.

[0014] Preferably, one end of the rotary drive element is provided with an engagement section, and one end of the receiving groove is provided with a limiting block, wherein the engagement section is arranged within the limiting block and connecting sections for positioning the engagement section are further provided on both sides of the limiting block; and wherein the rotary drive assembly further comprises a second rotary shaft which passes through the engagement section and whose two ends are mounted in the connecting sections, so that one end of the rotary drive element is rotatably connected to the engagement section via the second rotary shaft.

[0015] Preferably, the rotary mechanism further comprises a support assembly comprising a second fastening element, a support element and an elastic return assembly, wherein the support element is connected to the second fastening element via the elastic return assembly, the second fastening element is mounted on the lifting assembly and the support element rotates along the second fastening element and is constantly biased in the direction of a return position by the elastic return assembly.

[0016] To achieve the aforementioned purposes, the present application provides a piece of furniture comprising a furniture body and the aforementioned lifting and rotating frame for a backrest. The furniture body comprises a backrest and a headrest, wherein the lifting and rotating frame for a backrest is arranged within the backrest and the headrest, and the headrest is raised and / or rotated within a predetermined range relative to the backrest by actuating the lifting and rotating frame for a backrest.

[0017] In contrast to the prior art, the furniture of the present application comprises a furniture body, which includes a backrest and a headrest. The lifting and rotating frame for the backrest is arranged within the backrest and the headrest, allowing the headrest to perform lifting movements relative to the backrest and to rotate within a predetermined range relative to the backrest. This provides better support for the back, head, and neck. Furthermore, the assembly is simple, the operation convenient, and the use comfortable.

[0018] Preferably, the lifting mechanism further comprises a lifting drive assembly and a guide assembly, and the rotary mechanism comprises the rotary structure and a support assembly, wherein the lifting drive assembly is actuated to cause the lifting assembly to raise the rotary mechanism along the guide assembly, the lifting assembly comprises at least two lifting rods, the rotary structure is mounted on one of the lifting rods, the support assembly is mounted on another of the lifting rods, the headrest is attached to the rotary structure and the support assembly, and the rotary structure is actuated to rotate the headrest within a predetermined range relative to the backrest, causing the support assembly to rotate together with the headrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings necessary for describing these embodiments are briefly introduced below. Obviously, the drawings in the following description show some embodiments of the present application. A person skilled in the art can obtain further drawings from these without inventive effort. Fig. Figure 1 is a perspective view of a lifting and rotating frame for a backrest according to an embodiment of the present application. Fig. 2 is a perspective view of Fig. 1 in a different state. Fig. Figure 3 is a perspective view of Fig. 1 in yet another state. Fig. Figure 4 is a perspective view of Fig. 1 in another state. Fig. 5 is a side view of Fig. 4. Fig. Figure 6 is a structural view of the first fastener in Fig. 1. Fig. Figure 7 is a perspective view of the rotary assembly in Fig. 1. Fig. 8 is a side view of Fig. 7. Fig. Figure 9 is a perspective view of the rotating element in Fig. 7. Fig. Figure 10 is an exploded view of the structural support group in Fig. 1. Fig. Figure 11 is an exploded view of the structural support group in Fig. 2. Fig. Figure 12 is a perspective view of a piece of furniture according to an embodiment of the present application. Reference symbol: 1000 pieces of furniture; 1001 furniture bodies; 1002 Backrest; 1003 Headrest; 100 lifting and rotating frames for a backrest; 101 support frames; 10 Lifting mechanism; 11 Lifting drive assembly; 111 Lifting drive element; 112 Lifting connection assembly; 12 Guide assembly; 13 Lifting assembly; 131 Lifting bar; 20 rotating mechanism; 201 Rotary structure; 21 First fastening element; 211 First filming section; 212 Second turning section; 213 Guide pin; 214 Fastening section; 22 Rotary drive assembly; 221 Rotary drive element; 2211 Intervention section; 222 Telescopic pole; 223 First rotating shaft; 224 Second rotating shaft; 23 Rotary assembly; 230 rotating element; 231 recordings; 232 Assembly section; 233 Boundary block; 234 Connecting section; 235 Management section; 2351 First locking groove; 2352 Second locking groove; 236 Rotary shaft; 24 Support structure group; 241 Second fastening element; 242 Support element; 243 Elastic restoring assembly; 2431 Elastic element; 2432 Cover body. DETAILED DESCRIPTION OF THE EXECUTION FORMS SHOWN

[0020] In order to explain in detail the technical content and structural features of the present application, a detailed description is given below in conjunction with the embodiments and the drawings.

[0021] With reference to Fig. 1 to Fig. 4. The present application provides a lifting and rotating frame for a backrest 100, comprising a support frame 101, a lifting mechanism 10, and a rotating mechanism 20. The lifting mechanism 10 is arranged on the support frame 101 and includes a lifting assembly 13 that can perform a lifting movement relative to the support frame 101. The rotating mechanism 20 is mounted on the lifting assembly 13 and can perform a lifting movement together with the lifting assembly 13.

[0022] Furthermore, the rotary mechanism 20 comprises a rotary structure 201. The rotary structure 201 includes a first fastening element 21, a rotary drive assembly 22, and a rotary mounting assembly 23. The rotary drive assembly 22 and the rotary mounting assembly 23 are mounted on the lifting assembly 13 via the first fastening element 21. The first fastening element 21 is provided with a first rotary section 211 and a second rotary section 212. One end of the rotary drive assembly 22 is rotatably connected to the first rotary section 211, and one end of the rotary mounting assembly 23 is rotatably connected to the second rotary section 212. A connecting line between the first rotary section 211 and the second rotary section 212 forms an angle with both the rotary drive assembly 22 and the rotary mounting assembly 23.This means that the rotary drive assembly 22 and the rotary mounting assembly 23 are not completely aligned, allowing them to form a stable triangle together with the first fastening element 21, thus making the overall structure more stable and reliable. Furthermore, one end of the rotary drive assembly 22, facing away from the first fastening element 21, is rotatably connected to the other end of the rotary mounting assembly 23, also facing away from the first fastening element 21. When the rotary drive assembly 22 is actuated, the rotary drive assembly 22 and the rotary mounting assembly 23 rotate relative to the first fastening element 21 and also rotate relative to each other.

[0023] In contrast to the prior art, the lifting and rotating frame for a backrest 100 of the present application can be automatically lifted and rotated, with a simple design and easy operation. The lifting and rotating frame for a backrest 100 comprises a support frame 101, a lifting mechanism 10, and a rotating mechanism 20. The lifting mechanism 10 is arranged on the support frame 101 and includes a lifting assembly 13 that can perform a lifting movement. The rotating mechanism 20 is mounted on the lifting assembly 13 and can perform a lifting movement together with the lifting assembly 13. The rotary mechanism 20 comprises a rotary structure 201. The rotary structure 201 comprises a first fastening element 21, a rotary drive assembly 22, and a rotary mounting assembly 23. The rotary drive assembly 22 and the rotary mounting assembly 23 are mounted on the lifting assembly 13 via the first fastening element 21, and the first fastening element 21 is attached to the lifting assembly 13.The first fastening element 21 is provided with a first rotary section 211 and a second rotary section 212. One end of the rotary drive assembly 22 is rotatably connected to the first rotary section 211, and one end of the rotary mounting assembly 23 is rotatably connected to the second rotary section 212. A connecting line between the first rotary section 211 and the second rotary section 212 forms an angle with both the rotary drive assembly 22 and the rotary mounting assembly 23. Furthermore, an end of the rotary drive assembly 22 opposite the first fastening element 21 is rotatably connected to an end of the rotary mounting assembly 23 opposite the first fastening element 21. That is, the connecting line between the first rotary section 211 and the second rotary section 212, together with the rotary drive assembly 22 and the rotary mounting assembly 23, forms a triangle.The first fastening element 21 is secured, and the line connecting the first rotary section 211 and the second rotary section 212 remains constant. The rotary drive assembly 22 is actuated to change its length, thereby rotating the rotary drive assembly 22 and the rotary mounting assembly 23 relative to the first fastening element 21. This changes both the angle between the line connecting the first rotary section 211 and the second rotary section 212 and the rotary drive assembly 22, and the angle between said line connecting the rotary drive assembly and the rotary mounting assembly 23. Clearly, the triangular structure is stable and reliable, and its overall structure does not change arbitrarily when the rotary drive assembly 22 is not actuated.This allows the lifting and rotating frame for a backrest 100 of the present application to be automatically lifted and rotated, has a stable and reliable overall structure and is easy and convenient to use.

[0024] With reference to Fig. 1 to Fig. In some optional embodiments, the rotary assembly 23 comprises a rotary element 230 and a rotary shaft 236. One end of the rotary element 230 is rotatably connected to the second rotary section 212 via the rotary shaft 236. The first fastening element 21 is provided with a guide pin 213 that interacts with the rotary element 230. An end of the rotary element 230 adjacent to the rotary shaft 236 is provided with a guide section 235 that interacts with the guide pin 213. The rotary drive assembly 22 is actuated to rotate the guide section 235 along the guide pin 213. It is understood that, when the rotary drive assembly 22 is not actuated, the rotary element 230 cannot rotate freely due to the limiting engagement between the guide section 235 and the guide pin 213.The guide pin 213 can perform a limiting function, with the guide section 235 bearing against the guide pin 213 and limiting the rotation of the rotary element 230. Conversely, when the rotary drive assembly 22 is actuated, the arc-shaped guide section 235 can rotate along the cylindrical guide pin 213.

[0025] In particular, the guide section 235 has a first locking groove 2351 and a second locking groove 2352. When the guide pin 213 is in the first locking groove 2351, the rotary structure 201 and the lifting assembly 13 are at a first predetermined angle. When the guide pin 213 is in the second locking groove 2352, the rotary structure 201 and the lifting assembly 13 are at a second predetermined angle. The rotary drive assembly 22 is actuated to rotate the rotary structure 201 relative to the lifting assembly 13 within a range between the first predetermined angle and the second predetermined angle. For example, when the guide pin 213 is in the first locking groove 2351, the entire rotating structure 201 is approximately aligned with the lifting rod 131 and forms an angle of about 180° with the lifting rod 131.When the guide pin 213 is in the second locking groove 2352, the angle between the entire rotary structure 201 and the lifting rod 131 is approximately 225°. This means that the rotary drive assembly 22 can adjust the angle of the headrest 1003 relative to the backrest 1002 within a range of 180° to 225°, allowing for adjustment to a desired comfortable angle. Of course, the range of the first and second predetermined angles can also include other suitable ranges, such as 165° to 270°.

[0026] With reference to Fig. 1 to Fig. In some optional embodiments, the rotary drive assembly 22 comprises a rotary drive element 221 and a telescopic rod 222. One end of the telescopic rod 222 is connected to an output end of the rotary drive element 221 and can telescopically extend within the rotary drive element 221. The other end of the telescopic rod 222 is connected to the first rotary section 211 via a first rotary shaft 223. The rotary drive element 221 drives the telescopic rod 222 to telescopically extend, causing the telescopic rod 222 to rotate about the first rotary shaft 223 and thereby driving the rotary assembly 23 to rotate. In particular, the rotary drive element 221 is actuated to cause the telescopic rod 222 to extend or retract within the rotary drive element 221. This telescopic movement changes the overall length of the rotary drive assembly 22.Since one end of the telescopic rod 222 is rotatably connected to the first rotary section 211, and the rotary drive element 221 is also rotatably connected to the rotary assembly 23, the rotary drive assembly 22 drives the rotary assembly 23 to rotate relative to the first fastening element 21, thereby adjusting the angle of the headrest 1003 relative to the backrest 1002. The first fastening element 21 is connected to and attached to the lifting rod 131 via a fastening section 214.

[0027] With reference to Fig. 7 to Fig. In some optional embodiments, the rotary element 230 is provided with a receiving groove 231 and a mounting section 232. Specifically, the mounting section 232 projects from one or both sides of the receiving groove 231. The rotary drive element 221 is mounted within the receiving groove 231. The mounting section 232 can be used to attach the headrest 1003.

[0028] With reference to Fig. 1 to Fig. 5 and Fig. 7 to Fig. In some optional embodiments, one end of the rotary drive element 221 is provided with an engagement section 2211. One end of the receiving groove 231 is provided with a limiting block 233. The engagement section 2211 is arranged within the limiting block 233 to increase the stability of the structure. Furthermore, connecting sections 234 are provided on both sides of the limiting block 233 for positioning the engagement section 2211. As shown, the rotary drive assembly 22 also includes a second rotary shaft 224. In particular, the second rotary shaft 224 extends through the engagement section 2211, with its two ends being mounted in the connecting sections 234 on both sides, so that one end of the rotary drive element 221 is rotatably connected to the engagement section 2211 via the second rotary shaft 224.It is understood that, under the limiting effect of the limiting block 233 and the connecting sections 234 on the engagement section 2211, the angle between the rotary drive element 221 and the rotary element 230 remains essentially constant. When the telescopic rod 222 extends or retracts, the overall length of the rotary drive assembly 22 changes, causing the rotary element 230 to rotate about the pivot shaft 236, thus achieving the angle adjustment of the headrest 1003 relative to the backrest 1002.

[0029] With reference to Fig. 1 to Fig. 4 as well Fig. 10 and Fig. In some optional embodiments, the rotary mechanism 20 further comprises a support assembly 24. The support assembly 24 includes a second fastening element 241, a support element 242, and an elastic return assembly 243. The support element 242 is connected to the second fastening element 241 via the elastic return assembly 243. The second fastening element 241 is mounted on the lifting assembly 13. The support element 242 rotates along the second fastening element 241 and is continuously biased towards a return position by the elastic return assembly 243. For example, the support element 242 serves to attach the headrest 1003. The headrest 1003 is attached to the support element 242 and the support section of the rotary element 230, thus achieving a stable and reliable structure. In particular, the elastic restoring assembly 243 comprises an elastic element 2431 and a cover body 2432.The cover body 2432 covers the elastic element 2431. For example, the elastic element 2431 can be a coil spring. One end of the elastic element 2431 is connected to the support element 242, and the other end of the elastic element 2431 is connected to the second fastening element 241. The structure of the second fastening element 241 is essentially the same as that of the first fastening element 21. When the angle of the headrest 1003 is adjusted, the headrest 1003 rotates with the rotating structure 201, causing the support element 242 to rotate together with the headrest 1003 relative to the second fastening element 241. The rotating support element 242 continuously compresses the elastic element 2431. When it is necessary to readjust the headrest 1003, the headrest 1003 rotates back with the rotating structure 201 and drives the support element 242 to also rotate back.At the same time, the support element 242 can return to its original position more evenly under the elastic force of the elastic element 2431, without problems such as jamming occurring.

[0030] With reference to Fig. 1 to Fig. In some optional embodiments, the lifting mechanism 10 further comprises a lifting drive assembly 11 and a guide assembly 12. The rotary mechanism 20 comprises the rotary structure 201 and the support assembly 24. The lifting drive assembly 11 comprises a lifting drive element 111 and a lifting connection assembly 112 arranged at the output end of the lifting drive element 111. The lifting assembly 13 is connected to the lifting connection assembly 112. The lifting drive element 111 is actuated to cause the lifting assembly 13 to lift the rotary mechanism 20 along the guide assembly 12. In particular, the lifting assembly 13 comprises at least two lifting rods 131. The rotary structure 201 is mounted on one of the lifting rods 131, and the support assembly 24 is mounted on another of the lifting rods 131. The headrest 1003 is attached to the rotating structure 201 and the support structure group 24.The rotary structure 201 is actuated to rotate the headrest 1003 within a predetermined range relative to the backrest 1002, causing the support assembly 24 to rotate along with the headrest 1003.

[0031] With reference to Fig. 12. The present application further provides a piece of furniture 1000 comprising a furniture body 1001. The furniture body 1001 comprises a backrest 1002 and a headrest 1003. The furniture 1000 further comprises the lifting and rotating frame for a backrest 100 described above. The lifting and rotating frame for a backrest 100 is arranged within the backrest 1002 and the headrest 1003. By actuating the lifting and rotating frame for a backrest 100, the headrest 1003 is caused to perform lifting movements relative to the backrest 1002 and / or to be rotated within a predetermined range relative to the backrest 1002.

[0032] In contrast to the prior art, the furniture 1000 of the present application comprises a furniture body 1001 with a backrest 1002 and a headrest 1003. The lifting and rotating frame for the backrest 100 is arranged within the backrest 1002 and the headrest 1003, so that the headrest 1003 can perform lifting movements relative to the backrest 1002 and can also be rotated within a predetermined range relative to the backrest 1002. This provides better support for the back, head, and neck. Furthermore, the assembly is simple, the operation convenient, and the use comfortable.

[0033] As in Fig. 1 to Fig.As shown in Figure 12, the furniture 1000 of the present application can be a sofa. The furniture 1000 comprises the lifting and rotating frame for a backrest 100, so that the headrest 1003 can be automatically raised and automatically rotated to adjust its angle relative to the backrest 1002. The construction is simple, the operation convenient, and the use more comfortable. The lifting and rotating frame for a backrest 100 comprises a support frame 101, a lifting mechanism 10, and a rotating mechanism 20. The lifting mechanism 10 is arranged on the support frame 101 and comprises a lifting assembly 13 that can perform a lifting movement. The rotating mechanism 20 is mounted on the lifting assembly 13 and can perform a lifting movement together with the lifting assembly 13. The rotating mechanism 20 comprises a rotating structure 201 and a support assembly 24.The rotary structure 201 and the support assembly 24 secure the headrest 1003 from both sides, thus achieving a stable and reliable structure. The rotary structure 201 comprises a first fastening element 21, a rotary drive assembly 22, and a rotary mounting assembly 23. The rotary drive assembly 22 and the rotary mounting assembly 23 are mounted to a lifting rod 131 via the first fastening element 21, and the support assembly 24 is mounted to another lifting rod 131. The first fastening element 21 is provided with a first rotary section 211 and a second rotary section 212. One end of the rotary drive assembly 22 is rotatably connected to the first rotary section 211, and one end of the rotary mounting assembly 23 is rotatably connected to the second rotary section 212. A connecting line between the first rotary section 211 and the second rotary section 212 forms an angle with both the rotary drive assembly 22 and the rotary assembly assembly 23.Furthermore, an end of the rotary drive assembly 22 opposite the first fastening element 21 is rotatably connected to an end of the rotary mounting assembly 23 opposite the first fastening element 21. That is, the line connecting the first rotary section 211 and the second rotary section 212, together with the rotary drive assembly 22 and the rotary mounting assembly 23, forms a triangle. The first fastening element 21 is fixed, and the line connecting the first rotary section 211 and the second rotary section 212 remains constant. The rotary drive assembly 22 is actuated to change its length, thereby rotating the rotary drive assembly 22 and the rotary mounting assembly 23 relative to the first fastening element 21.This changes both the angle between the connecting line between the first rotary section 211 and the second rotary section 212 and the rotary drive assembly 22, and the angle between said connecting line and the rotary assembly 23; accordingly, the angle of the headrest 1003 relative to the backrest 1002 is changed. In the present application, the triangular structure is stable and reliable, and its overall structure does not change arbitrarily when the rotary drive assembly 22 is not actuated. Therefore, the lifting and rotating frame for a backrest 100 of the present application can automatically lift and rotate the headrest 1003 relative to the backrest 1002. The overall structure is stable and reliable, and operation is simple and convenient. In the sofa of the present application, the headrest 1003 can support the back as needed and can also support the head and neck.By adjusting the height and angle of the headrest 1003 using the lifting and rotating frame for a backrest 100, the usage requirements of people of different body sizes can be met to improve comfort.

[0034] The foregoing descriptions merely represent preferred embodiments of the present application and are not intended to limit the scope of protection of the application. Any modifications, equivalent replacements, or improvements made within the spirit and principles of the present application shall fall within the scope of protection of the present application.

Claims

[1] Lifting and rotating frame for a backrest, comprising: a support frame; a lifting mechanism arranged on the support frame, comprising a lifting assembly; and a rotary mechanism mounted on the lifting assembly which, together with the lifting assembly, can perform a lifting movement, wherein the rotary mechanism comprises a rotary structure and the rotary structure comprises a first fastening element, a rotary drive assembly and a rotary mounting assembly; wherein the rotary drive assembly and the rotary mounting assembly are mounted on the lifting assembly via the first fastening element; the first fastening element is provided with a first rotary section and a second rotary section, one end of the rotary drive assembly is rotatably connected to the first rotary section and one end of the rotary mounting assembly is rotatably connected to the second rotary section; a connecting line between the first rotary section and the second rotary section forms an angle with both the rotary drive assembly and the rotary mounting assembly; and an end of the rotary drive assembly facing away from the first fastening element is rotatably connected to an end of the rotary mounting assembly facing away from the first fastening element. [2] Lifting and rotating frame for a backrest according to claim 1, wherein the rotating assembly comprises a rotating element and a rotating shaft, and one end of the rotating element is rotatably connected to the second rotating section via the rotating shaft. [3] Lifting and rotating frame for a backrest according to claim 2, wherein the first fastening element is provided with a guide pin that interacts with the rotating element, and an end of the rotating element adjacent to the rotating shaft is provided with a guide section that interacts with the guide pin, and the rotary drive assembly is actuated to rotate the guide section along the guide pin. [4] Lifting and rotating frame for a backrest according to claim 3, wherein a first locking groove and a second locking groove are provided in the guide section, the guide pin is arranged in the first locking groove to set a first predetermined angle between the rotating structure and the lifting assembly, and the guide pin is arranged in the second locking groove to set a second predetermined angle between the rotating structure and the lifting assembly, and the rotary drive assembly is actuated to rotate the rotating structure relative to the lifting assembly within a range between the first predetermined angle and the second predetermined angle. [5] Lifting and rotating frame for a backrest according to claim 2, wherein the rotary drive assembly comprises a rotary drive element and a telescopic rod, wherein one end of the telescopic rod is connected to an output end of the rotary drive element and can perform a telescopic movement within the rotary drive element, and the other end of the telescopic rod is connected to the first rotary section via a first rotary shaft, wherein the rotary drive element drives the telescopic rod to a telescopic movement, so that the telescopic rod rotates about the first rotary shaft and thereby drives the rotary assembly to rotate. [6] Lifting and rotating frame for a backrest according to claim 5, wherein the rotating element is provided with a receiving groove and a mounting section, the mounting section protrudes from one or both sides of the receiving groove and the rotary drive element is mounted within the receiving groove. [7] Lifting and rotating frame for a backrest according to claim 6, wherein one end of the rotary drive element is provided with an engagement section and one end of the receiving groove is provided with a limiting block, the engagement section is arranged within the limiting block and connecting sections for positioning the engagement section are further provided on both sides of the limiting block; and wherein the rotary drive assembly further comprises a second rotary shaft which passes through the engagement section and the two ends of which are mounted in the connecting sections, so that one end of the rotary drive element is rotatably connected to the engagement section via the second rotary shaft. [8] Lifting and rotating frame for a backrest according to claim 1, wherein the rotating mechanism further comprises a support assembly comprising a second fastening element, a support element and an elastic return assembly, wherein the support element is connected to the second fastening element via the elastic return assembly, the second fastening element is mounted on the lifting assembly and the support element rotates along the second fastening element and is constantly biased in the direction of a return position by the elastic return assembly. [9] Furniture comprising a furniture body and the lifting and rotating frame for a backrest according to any one of claims 1 to 8, wherein the furniture body comprises a backrest and a headrest, the lifting and rotating frame for a backrest is arranged within the backrest and the headrest, and the headrest is raised and / or rotated within a predetermined range relative to the backrest by driving the lifting and rotating frame for a backrest. [10] Furniture according to claim 9, wherein the lifting mechanism further comprises a lifting drive assembly and a guide assembly, and the rotary mechanism comprises the rotary structure and a support assembly, wherein the lifting drive assembly is actuated to cause the lifting assembly to raise the rotary mechanism along the guide assembly, the lifting assembly comprises at least two lifting rods, the rotary structure is mounted on one of the lifting rods, the support assembly is mounted on another of the lifting rods, the headrest is attached to the rotary structure and the support assembly, and the rotary structure is actuated to rotate the headrest within a predetermined range relative to the backrest, causing the support assembly to rotate together with the headrest.

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