Sofa backrest folding mechanism

Abstract

The utility model discloses a sofa backrest folding mechanism in the field of furniture, which comprises two folding mechanism bodies symmetrically arranged in a sofa backrest, each folding mechanism body comprises a bottom plate, a first folding component, a second folding component, a first elastic piece and a second elastic piece, one end of the bottom plate is connected with a sofa base, and the other end of the bottom plate is connected with the sofa base. The other end of the bottom plate is hinged to one end of the first folding assembly, and the other end of the first folding assembly is hinged to the second folding assembly. One end of the first elastic piece is connected with the bottom plate, the other end of the first elastic piece is connected with the first folding assembly, one end of the second elastic piece is connected with the first folding assembly, and the other end of the second elastic piece is connected with the second folding assembly. The problem that the height of an existing sofa backrest cannot be flexibly adjusted according to use scenes or space requirements is solved, the sofa backrest can be switched between a folded state and an unfolded state, and the height requirements of the sofa backrest in different use scenes are met.

Description

Technical Field

[0001] This utility model relates to the field of furniture technology, specifically to a sofa backrest folding mechanism. Background Technology

[0002] In modern furniture design, sofas, as an indispensable part of home life, are receiving increasing attention from consumers for their comfort and functionality.

[0003] Sofas typically consist of a seat and a backrest. Traditional sofas have a fixed backrest height, which cannot be flexibly adjusted according to usage scenarios or space requirements. This not only limits the versatility of sofas but also imposes certain limitations on users' home furnishing arrangements.

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

[0005] To address the problem that existing sofa backrest height cannot be flexibly adjusted according to usage scenarios or space requirements, this utility model provides a sofa backrest folding mechanism.

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

[0007] A sofa backrest folding mechanism includes two folding mechanism bodies symmetrically arranged inside the sofa backrest, and the two folding mechanism bodies are connected by a connecting rod. Each folding mechanism body includes a base plate, a first folding component, a second folding component, a first elastic element, and a second elastic element. One end of the base plate is connected to the sofa base, and the other end of the base plate is hinged to one end of the first folding component. The other end of the first folding component is hinged to the second folding component.

[0008] One end of the first elastic element is connected to the base plate, and the other end of the first elastic element is connected to the first folding assembly. One end of the second elastic element is connected to the first folding assembly, and the other end of the second elastic element is connected to the second folding assembly, so that the folding mechanism body can switch between a folded state and an unfolded state.

[0009] According to the present utility model of the above-described scheme, the first folding assembly includes a first folding rod and a second folding rod. One end of the first folding rod and one end of the second folding rod are both hinged to the base plate. The other end of the first folding rod and the other end of the second folding rod are both hinged to the second folding assembly. One end of the first elastic member is connected to the base plate, and the other end of the first elastic member is connected to the first folding rod.

[0010] When the folding mechanism body is in the unfolded state, the first folding rod and the second folding rod abut against each other.

[0011] According to the above-described solution of this utility model, a first abutting part is provided on the side of the first folding rod near the second folding rod, and a second abutting part is provided on the side of the second folding rod near the first folding rod.

[0012] When the folding mechanism body is in the unfolded state, the first abutting part abuts against the side wall of the second folding rod, and the second abutting part abuts against the side wall of the first folding rod.

[0013] According to the present invention with the above-described solution, the first abutting part is located on the upper side of the first folding rod, and the second abutting part is located on the lower side of the second folding rod.

[0014] According to the present utility model with the above-described solution, a first connecting part is provided on the base plate, a second connecting part is provided on the first folding rod, one end of the first elastic member is provided on the first connecting part, and the other end of the first elastic member is provided on the second connecting part.

[0015] According to the above-described scheme of this utility model, the hinge point between the first folding rod and the base plate is lower than the hinge point between the second folding rod and the base plate.

[0016] According to the present invention based on the above scheme, the second folding assembly includes a third folding rod, the first folding rod and the second folding rod are both hinged to the third folding rod, one end of the second elastic member is connected to the first folding rod, and the other end of the second elastic member is connected to the third folding rod.

[0017] According to the present utility model with the above-described solution, a third connecting part is provided on the first folding rod, a fourth connecting part is provided on the third folding rod, one end of the second elastic member is provided on the third connecting part, and the other end of the second elastic member is provided on the fourth connecting part.

[0018] According to the above-described scheme of this utility model, the hinge point between the first folding rod and the third folding rod is lower than the hinge point between the second folding rod and the third folding rod.

[0019] According to the above-described solution of this utility model, when the folding mechanism body is in a folded state, the included angle between the first folding component and the second folding component is an acute angle;

[0020] When the folding mechanism body is in the unfolded state, the angle between the first folding component and the second folding component is an obtuse angle.

[0021] The advantages of this utility model based on the above solution are as follows:

[0022] In the aforementioned sofa back folding mechanism, the sofa back can switch between folded and unfolded states by hinged connection of the base plate, the first folding component, and the second folding component, in conjunction with the elastic deformation of the first elastic element and the second elastic element. This satisfies the height requirements of the sofa back in different usage scenarios and improves the multifunctionality and practicality of the sofa.

[0023] In addition, when the sofa backrest switches from the folded state to the unfolded state, the first elastic element and the second elastic element can provide force to the first folding assembly and the second folding assembly, so that the folding mechanism body unfolds smoothly and maintains a certain tension. This helps the sofa backrest maintain a stable posture after unfolding, reduces the shaking or tipping of the sofa backrest caused by external forces or long-term use, and improves the stability of the assembly. Attached Figure Description

[0024] Figure 1 This is one of the structural diagrams of the folding mechanism body in a folded state;

[0025] Figure 2 The second schematic diagram shows the structure of the folding mechanism when it is in a folded state.

[0026] Figure 3 This is the third structural diagram of the folding mechanism body in the folded state.

[0027] Figure 4 This is one of the structural diagrams of the folding mechanism body in the unfolded state;

[0028] Figure 5 The second schematic diagram shows the structure of the folding mechanism when it is in the unfolded state.

[0029] Figure 6 This is the third structural diagram of the folding mechanism body in the unfolded state.

[0030] Figure 7 This is a partial structural diagram of the folding mechanism body;

[0031] Figure 8 This is an exploded view of the folding mechanism body;

[0032] Figure 9 This is one of the schematic diagrams illustrating the application of this utility model on a sofa;

[0033] Figure 10 This is the second schematic diagram of the application of this utility model on a sofa.

[0034] In the diagram, 1. Folding mechanism body; 11. Base plate; 111. First connecting part; 12. First folding assembly; 121. First folding rod; 1211. First abutting part; 1212. Second connecting part; 1213. Third connecting part; 122. Second folding rod; 1221. Second abutting part; 13. Second folding assembly; 131. Third folding rod; 1311. Fourth connecting part; 14. First elastic element; 15. Second elastic element; 16. Connecting rod; 2. Sofa backrest; 21. First backrest; 22. Second backrest; 3. Sofa base; 4. Sofa cushion. Detailed Implementation

[0035] 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.

[0036] like Figures 1 to 6 As shown, this embodiment provides a sofa backrest folding mechanism, including two folding mechanism bodies 1 symmetrically arranged within the sofa backrest 2, and the two folding mechanism bodies 1 are connected by a connecting rod 16. Each folding mechanism body 1 includes a base plate 11, a first folding assembly 12, a second folding assembly 13, a first elastic element 14, and a second elastic element 15. One end of the base plate 11 is connected to the sofa base 3, and the other end of the base plate 11 is hinged to one end of the first folding assembly 12. The other end of the first folding assembly 12 is hinged to the second folding assembly 13. One end of the first elastic element 14 is connected to the base plate 11, and the other end of the first elastic element 14 is connected to the first folding assembly 12. One end of the second elastic element 15 is connected to the first folding assembly 12, and the other end of the second elastic element 15 is connected to the second folding assembly 13, so that the folding mechanism body 1 can switch between a folded state and an unfolded state. In addition, both ends of the connecting rod 16 are respectively connected to the two first folding assemblies 12 to maintain the balance of the folding mechanism body 1 in the folded and unfolded states, improve the uniformity of force distribution, and thus improve the stability of assembly.

[0037] like Figures 1 to 6As shown, in this embodiment, when the folding mechanism body 1 is in a folded state, the included angle between the first folding component 12 and the second folding component 13 is an acute angle; when the folding mechanism body 1 is in an unfolded state, the included angle between the first folding component 12 and the second folding component 13 is an obtuse angle. Specifically, the sofa backrest 2 includes a first backrest 21 and a second backrest 22, the first folding component 12 is disposed within the first backrest 21, and the second folding component 13 is disposed within the second backrest 22. When the folding mechanism body 1 is in the folded state, the sofa backrest 2 is also in the folded state. The first backrest 21 is in contact with the sofa cushion 4, and the second backrest 22 is tilted relative to the sofa cushion 4, which lowers the height of the sofa backrest 2 to meet the requirements of the sitting posture. When the folding mechanism body 1 is in the unfolded state, the sofa backrest 2 is also in the unfolded state. Both the first backrest 21 and the second backrest 22 are tilted relative to the sofa cushion 4, which raises the height of the sofa backrest 2 and increases the width of the sofa cushion 4. This allows the user to lean against the sofa backrest 2 with good support for the waist, shoulders, and neck, ensuring comfort during long periods of sitting.

[0038] For example, when the folding mechanism body 1 is in the folded state, the height of the sofa backrest 2 is 35cm to 45cm; when the folding mechanism body 1 is in the unfolded state, the height of the sofa backrest 2 is 49cm to 55cm. By utilizing the folding and unfolding states of the folding mechanism body 1, the sofa backrest 2 can flexibly adapt to different usage needs, providing users with a space-saving and highly comfortable sitting and lying experience.

[0039] This invention utilizes the hinged connection between the base plate 11, the first folding assembly 12, and the second folding assembly 13, along with the elastic deformation of the first elastic element 14 and the second elastic element 15, to allow the sofa backrest 2 to switch between a folded and unfolded state. This satisfies the height requirements of the sofa backrest 2 in different usage scenarios, improving the sofa's multifunctionality and practicality. Specifically, when space-saving or a lower sitting posture is required, the sofa backrest 2 can be manually folded up, reducing the angle between the first folding assembly 12 and the second folding assembly 13 to create a compact folded state. Conversely, when higher sitting support or a more spacious seating / lying area is needed, the sofa backrest 2 can be manually switched to an unfolded state, increasing the angle between the first folding assembly 12 and the second folding assembly 13 and raising the height of the sofa backrest 2, providing users with a more comfortable and spacious seating / lying experience.

[0040] Furthermore, when the sofa backrest 2 switches from the folded state to the unfolded state, the first elastic element 14 and the second elastic element 15 can provide force to the first folding assembly 12 and the second folding assembly 13, so that the folding mechanism body 1 unfolds smoothly and maintains a certain tension. This helps the sofa backrest 2 maintain a stable posture after unfolding, reduces the shaking or tipping of the sofa backrest 2 caused by external forces or long-term use, and improves the stability of the assembly.

[0041] like Figures 1 to 6 , Figure 9 , Figure 10 As shown, in this embodiment, the first folding assembly 12 includes a first folding rod 121 and a second folding rod 122. One end of the first folding rod 121 and one end of the second folding rod 122 are both hinged to the base plate 11. The other end of the first folding rod 121 and the other end of the second folding rod 122 are both hinged to the second folding assembly 13. The two ends of the connecting rod 16 are respectively connected to the two second folding rods 122, ensuring the stability and coordination of the entire folding mechanism during operation. One end of the first elastic member 14 is connected to the base plate 11, and the other end of the first elastic member 14 is connected to the first folding rod 121. When the folding mechanism body 1 is in the unfolded state, the sofa backrest 2 and sofa cushion 4 are tilted, forming a certain tilt angle between them. This design not only conforms to ergonomics, making people more comfortable when sitting or lying down, but also allows the first elastic element 14 to undergo elastic deformation, providing tension to the first folding rod 121 and preventing the sofa backrest 2 from tilting away from the sofa cushion 4, thus ensuring the stability and safety of the sofa. At the same time, the first folding rod 121 is located on the side of the second folding rod 122 close to the sofa cushion 4. When the folding mechanism body 1 is in the unfolded state, the first folding rod 121 and the second folding rod 122 abut against each other, and the second folding rod 122 can provide support for the first folding rod 121, further preventing the sofa backrest 2 from tilting. When the folding mechanism body 1 is in the folded state, the first elastic element 14 undergoes elastic deformation, which can provide tension to the first folding rod 121, so that the first backrest 21 fits against the sofa cushion 4, allowing the sofa backrest 2 to be easily folded up, reducing the height of the sofa backrest 2, thereby saving space.

[0042] like Figures 7 to 8As shown, in this embodiment, a first abutment portion 1211 is provided on the side of the first folding rod 121 near the second folding rod 122, and a second abutment portion 1221 is provided on the side of the second folding rod 122 near the first folding rod 121. When the folding mechanism body 1 is in the unfolded state, the first abutment portion 1211 abuts against the side wall of the second folding rod 122, and the second abutment portion 1221 abuts against the side wall of the first folding rod 121. This not only increases the stability of the folding mechanism body 1 in the unfolded state, but also effectively prevents accidental folding or deformation caused by external forces, ensuring the stability and safety of the sofa. Furthermore, the first abutment portion 1211 is located above the first folding rod 121, and the second abutment portion 1221 is located below the second folding rod 122. This ensures that when the folding mechanism body 1 is unfolded, the force on the first folding rod 121 and the second folding rod 122 is more evenly distributed. The first abutment portion 1211 on the upper side of the first folding rod 121 can withstand the pressure from the top of the sofa backrest 2, while the second abutment portion 1221 on the lower side of the second folding rod 122 can support the weight from the bottom of the sofa backrest 2. The first abutment portion 1211 and the second abutment portion 1221 work together to effectively distribute the stress on the folding mechanism body 1 in the unfolded state, extending its service life. When the sofa needs to be folded, the first abutment portion 1211 and the second abutment portion 1221 can smoothly separate, allowing the first folding rod 121 and the second folding rod 122 to rotate flexibly along their respective hinge points until they are fully folded. This reduces friction and resistance during the folding process, making operation easier and more convenient.

[0043] like Figure 3 , Figures 6 to 8 As shown, in this embodiment, a first connecting portion 111 is provided on the base plate 11, and a second connecting portion 1212 is provided on the first folding rod 121. One end of the first elastic member 14 is provided on the first connecting portion 111, and the other end of the first elastic member 14 is provided on the second connecting portion 1212. This effectively enhances the stability of the folding mechanism body 1 during unfolding or folding. The first elastic member 14 can provide continuous tension to prevent the first folding rod 121 from accidentally moving or deforming due to external force or its own weight, thereby improving the safety and reliability of the entire structure. When the folding mechanism body 1 transitions from the folded state to the unfolded state, the first elastic member 14 can assist the first folding rod 121 to move smoothly to the predetermined position, making the operation smoother. Similarly, during the folding process of the folding mechanism body 1, the first elastic member 14 can also provide the necessary tension to help the first folding rod 121 fold smoothly into place, improving the ease of use and efficiency of the folding mechanism.

[0044] like Figures 7 to 8As shown, in this embodiment, the hinge point between the first folding rod 121 and the base plate 11 is lower than the hinge point between the second folding rod 122 and the base plate 11. This lowers the center of gravity of the entire folding mechanism in the unfolded state, which helps increase the stability of the folding mechanism body 1. Especially when subjected to external force or used by the user, it reduces the risk of tipping over or swaying, providing more stable support. Furthermore, due to the difference in the hinge point positions, the movement trajectories of the first folding rod 121 and the second folding rod 122 during folding and unfolding are different, making the folding mechanism body 1 more compact when folded, reducing space occupation, and allowing it to unfold more smoothly to the predetermined position.

[0045] like Figures 1 to 4 , Figure 7 , Figure 8 As shown, in this embodiment, the second folding assembly 13 includes a third folding rod 131. The first folding rod 121 and the second folding rod 122 are both hinged to the third folding rod 131. One end of the second elastic member 15 is connected to the first folding rod 121, and the other end of the second elastic member 15 is connected to the third folding rod 131. When the folding mechanism body 1 is in the unfolded state, since the sofa backrest 2 and the sofa cushion 4 are inclined, that is, a certain tilt angle is formed between the sofa backrest 2 and the sofa cushion 4, the second elastic member 15 undergoes elastic deformation, which can provide tension to the first folding rod 121 and the third folding rod 131, preventing the sofa backrest 2 from tilting away from the sofa cushion 4, thereby ensuring the stability and safety of the sofa. When the folding mechanism body 1 is in the folded state, the second elastic member 15 undergoes elastic deformation, which can provide tension to the third folding rod 131, preventing the third folding rod 131 from tilting towards the side closer to the sofa cushion 4, so that the sofa backrest 2 can be folded up, reducing the height of the sofa backrest 2, thereby saving space.

[0046] like Figure 3 , Figures 6 to 8As shown, in this embodiment, a third connecting portion 1213 is provided on the first folding rod 121, and a fourth connecting portion 1311 is provided on the third folding rod 131. One end of the second elastic member 15 is provided on the third connecting portion 1213, and the other end of the second elastic member 15 is provided on the fourth connecting portion 1311. This effectively enhances the stability of the folding mechanism body 1 during unfolding or folding. The second elastic member 15 can provide continuous tension to prevent the first folding rod 121 and the third folding rod 131 from accidentally moving or deforming due to external forces or their own weight, thereby improving the safety and reliability of the entire structure. When the folding mechanism body 1 transitions from the folded state to the unfolded state, the second elastic member 15 can assist the third folding rod 131 to move smoothly to the predetermined position, making the operation smoother. Similarly, during the folding process of the folding mechanism body 1, the second elastic member 15 can also provide the necessary tension to help the third folding rod 131 fold smoothly into place, improving the ease of use and efficiency of the folding mechanism.

[0047] like Figures 7 to 8 As shown, in this embodiment, the hinge point between the first folding rod 121 and the third folding rod 131 is lower than the hinge point between the second folding rod 122 and the third folding rod 131. This lowers the center of gravity of the entire folding mechanism in the unfolded state, helping to increase the stability of the folding mechanism body 1. Especially when subjected to external forces or used by the user, it reduces the risk of tipping over or swaying, providing more stable support. Furthermore, due to the difference in the hinge point positions, the movement trajectories of the first folding rod 121 and the second folding rod 122 during folding and unfolding will also differ, making the folding mechanism body 1 more compact when folded, reducing space occupation, and allowing it to unfold more smoothly to the predetermined position.

[0048] In this embodiment, both the first elastic element 14 and the second elastic element 15 are springs, capable of elastic deformation, providing tension to the first folding rod 121 and the third folding rod 131. This facilitates the switching of the folding mechanism body 1 between the folded and unfolded states, meeting the height requirements of the sofa backrest 2 in different usage scenarios. Of course, in actual design, the structure of the first elastic element 14 and the second elastic element 15 can be designed according to actual needs.

[0049] 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.

[0050] 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 sofa backrest folding mechanism, characterized in that, The device includes two folding mechanism bodies symmetrically arranged inside the backrest of a sofa, and the two folding mechanism bodies are connected by a connecting rod. Each folding mechanism body includes a base plate, a first folding component, a second folding component, a first elastic element, and a second elastic element. One end of the base plate is connected to the sofa base, and the other end of the base plate is hinged to one end of the first folding component. The other end of the first folding component is hinged to the second folding component. One end of the first elastic element is connected to the base plate, and the other end of the first elastic element is connected to the first folding assembly. One end of the second elastic element is connected to the first folding assembly, and the other end of the second elastic element is connected to the second folding assembly, so that the folding mechanism body can switch between a folded state and an unfolded state.

2. The sofa back folding mechanism according to claim 1, characterized in that, The first folding assembly includes a first folding rod and a second folding rod. One end of the first folding rod and one end of the second folding rod are both hinged to the base plate. The other ends of the first folding rod and the second folding rod are both hinged to the second folding assembly. One end of the first elastic member is connected to the base plate, and the other end of the first elastic member is connected to the first folding rod. When the folding mechanism body is in the unfolded state, the first folding rod and the second folding rod abut against each other.

3. The sofa back folding mechanism according to claim 2, characterized in that, The first folding rod has a first abutting part on the side near the second folding rod, and the second folding rod has a second abutting part on the side near the first folding rod. When the folding mechanism body is in the unfolded state, the first abutting part abuts against the side wall of the second folding rod, and the second abutting part abuts against the side wall of the first folding rod.

4. The sofa back folding mechanism according to claim 3, characterized in that, The first abutting part is located on the upper side of the first folding rod, and the second abutting part is located on the lower side of the second folding rod.

5. The sofa back folding mechanism according to claim 2, characterized in that, The base plate is provided with a first connecting part, the first folding rod is provided with a second connecting part, one end of the first elastic member is provided on the first connecting part, and the other end of the first elastic member is provided on the second connecting part.

6. The sofa back folding mechanism according to claim 2, characterized in that, The hinge point between the first folding rod and the base plate is lower than the hinge point between the second folding rod and the base plate.

7. The sofa back folding mechanism according to claim 2, characterized in that, The second folding assembly includes a third folding rod, and both the first folding rod and the second folding rod are hinged to the third folding rod. One end of the second elastic member is connected to the first folding rod, and the other end of the second elastic member is connected to the third folding rod.

8. The sofa back folding mechanism according to claim 7, characterized in that, The first folding rod is provided with a third connecting part, the third folding rod is provided with a fourth connecting part, one end of the second elastic member is provided on the third connecting part, and the other end of the second elastic member is provided on the fourth connecting part.

9. The sofa back folding mechanism according to claim 7, characterized in that, The hinge point between the first folding rod and the third folding rod is lower than the hinge point between the second folding rod and the third folding rod.

10. The sofa back folding mechanism according to claim 7, characterized in that, When the folding mechanism body is in a folded state, the included angle between the first folding component and the second folding component is an acute angle; When the folding mechanism body is in the unfolded state, the angle between the first folding component and the second folding component is an obtuse angle.

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