A lifting chair back

Abstract

The application relates to the field of seat mechanisms, in particular to a lifting chair backrest, which comprises a lifting chair seat, a cushion framework, a cushion installed on the cushion framework, and a backrest connecting part arranged on the cushion framework, the backrest connecting part comprising a first mounting part and a second mounting part, the first mounting part and the second mounting part being used for mounting other components; a backrest body comprising a backrest framework main body, a back plate, and an S-shaped frame body arranged between the backrest framework main body and the back plate, an adjusting space being arranged between the backrest framework main body and the back plate, and an S-shaped part of the S-shaped frame body being located in the adjusting space; wherein one end of the backrest framework main body close to the seat body is mounted at the first mounting part, one end of the S-shaped frame body close to the seat body is mounted at the second mounting part, when the height of the backrest body is increased, the shape of the S-shaped frame body is compressed, the height of the lifting chair seat is reduced, and the shape of the S-shaped frame body is stretched. The application has the effect that the backrest is more flexible during use.

Description

Technical Field

[0001] This application relates to the field of seat structures, and more particularly to a height-adjustable chair back. Background Technology

[0002] An adjustable chair is a new type of chair, mainly composed of a seat, backrest, frame, frame rocker arm, lifting and positioning device, and chair legs. Its key feature is that the frame and chair legs are hinged together by the frame rocker arm, which rotates up and down around a hinge axis on the chair leg. Shaking the rocker arm causes the frame to rise or fall, thus adjusting the seat position. Additionally, a lifting and positioning device is installed between the frame and chair legs. Currently, adjustable chairs come in various types and are widely used in workplaces, study areas, and production facilities. They possess a certain degree of ergonomic design and are beneficial to health.

[0003] With increasingly longer periods spent working and gaming from home, rigid, formulaic office spaces can no longer meet people's needs. Therefore, there's a growing demand for desks and chairs that emphasize individuality and human-centered design, featuring diverse colors, unique shapes, and ease of use. However, style or function alone is insufficient; a balance of professionalism and personalization is needed. When working, the first step is to adjust the desk or workbench to a suitable height based on the nature of the work. Different desk heights require different chair placement, sometimes even necessitating a different chair. The current market offers a variety of chair designs, with the backrest design being crucial for user comfort and experience. Traditional chair back designs often use fixed structures, lacking flexibility to adapt to user needs and offering shortcomings in visual appeal and ease of cleaning. Summary of the Invention

[0004] To make the chair back more flexible in use, this application provides a height-adjustable chair back.

[0005] This application provides a height-adjustable chair backrest, which adopts the following technical solution:

[0006] A height-adjustable chair back, comprising:

[0007] The adjustable chair seat includes a seat frame, a seat cushion mounted on the seat frame, and a backrest connection part disposed on the seat frame. The backrest connection part includes a first mounting part and a second mounting part, which are used to mount other components.

[0008] The chair back body includes a backrest frame body, a back panel connected to the backrest frame body, and an S-shaped frame disposed between the backrest frame body and the back panel. There is an adjustment space between the backrest frame body and the back panel, and the S-shaped part of the S-shaped frame is located within the adjustment space.

[0009] The backrest frame body is installed at the first mounting part at one end near the seat body, and the S-shaped frame is installed at the second mounting part at one end near the seat body. When the height of the backrest body is increased, the shape of the S-shaped frame is extended, and when the height of the adjustable seat is decreased, the shape of the S-shaped frame is compressed.

[0010] By adopting the above technical solution, when the chair back height is raised, the S-shape undergoes elongation deformation in the height direction. Since the S-shape has greater elastic deformation and can stretch and deform in the vertical direction, the chair back is short when the seat is lowered and long when it is raised. The shape changes with the height. The S-shape design makes the chair back more flexible in use and ensures the visual integrity of the chair back.

[0011] Preferably, the backrest frame body is a frame with a space in the middle, a cam is provided between the backrest frame body and the S-shaped frame, and a connecting lug for mounting the cam is provided on the backrest frame body;

[0012] The back panel is provided with a mounting ear at one end near the adjustable chair seat. The mounting ear has a cam hole. When the back panel is installed with the backrest frame body, the book-searching cam is located in the cam hole.

[0013] By adopting the above technical solution, the main body of the backrest frame has a space in the middle. Firstly, it can reduce the weight of the main body of the backrest frame while ensuring strength. Secondly, it can save materials and reduce costs while ensuring overall strength. After the back panel is connected by the backrest frame, the shape of the back panel changes with the S-shaped frame. After the user adjusts the height, not only is the integrity maintained, but the back panel also forms an arc-shaped protrusion following the change of the S-shaped frame. When leaning against the backrest, this arc-shaped protrusion acts as a cushion, so that the user does not need to use a cushion and avoids the trouble of the cushion falling off.

[0014] Preferably, the S-shaped frame includes a first curved portion and a second curved portion, the second curved portion being close to the adjustable chair seat, the first curved portion being connected to the second curved portion and located above the second curved portion, the first curved portion and the second curved portion having opposite bending directions, and the lower half of the back panel being flush with the first curved portion.

[0015] By adopting the above technical solution, the lower part of the back panel is flush with the first curved part and forms a convex arc shape with the first curved part, which not only ensures the overall visual effect but also helps to improve comfort. When in use, it supports the user's back. When adjusting the height of the chair back, the position and curvature of the first curved part will also change, which can meet the needs of different heights during the lifting and lowering process.

[0016] Preferably, the back panel is uniformly textured, which ensures comfort when the back panel is bent. The upper part of the back panel is a first back panel, and the lower part of the back panel is a second back panel. The thickness of the first back panel is less than the thickness of the second back panel.

[0017] By adopting the above technical solution, the texture set on the back panel is a special shape. The texture reduces discomfort when the back panel is bent and improves the comfort of the lower back. The thickness of the first back panel is less than that of the second back panel, which allows the first back panel to fit and wrap the back more comfortably, while the second back panel can support the waist, which is in line with ergonomics.

[0018] Preferably, the first curved portion has an arc, and the second curved portion has a plurality of buffer grooves evenly distributed on the side near the lifting chair seat.

[0019] By adopting the above technical solution, the curvature of the first bending part mainly serves a supporting function, while the buffer groove is mainly used to increase the adjustment space, so that the second bending part can achieve a better curvature while reducing stress.

[0020] Preferably, the buffer groove is L-shaped.

[0021] By adopting the above technical solution, the specially shaped groove increases the deformation of the second bending section.

[0022] Preferably, the backrest connection is L-shaped, the first mounting part is arranged horizontally, the second mounting part is arranged vertically, and the first mounting part is connected to the seat cushion frame;

[0023] The bottom of the backrest frame body is provided with a telescopic cavity, which is fitted onto the second mounting part, so that the backrest frame body can be adjusted in the vertical direction.

[0024] By adopting the above technical solution, the telescopic cavity provides bending space for the S-shaped frame when adjusting the backrest height, thereby increasing the service life of the seat.

[0025] Preferably, a height positioning structure is provided between the main body of the backrest frame and the connecting part of the chair back, and the height positioning structure can lock the height position of the chair back.

[0026] By adopting the above technical solution, adjusting the backrest can prevent the backrest from being mispositioned, which would cause height changes and inconvenience in use.

[0027] Preferably, the lower end of the S-shaped frame is provided with an ear plate, and the ear plate has a connecting hole, through which the S-shaped frame is rotatably connected to the first mounting part.

[0028] Preferably, the S-shaped frame is rotatably connected to the rear end of the seat cushion frame through the connecting hole.

[0029] By adopting the above technical solution, the lower end of the S-shaped frame can be rotatably connected to the rear end of the seat cushion frame or the backrest connection. This allows for better adaptation to the elongation and deformation of the S-shaped frame, making backrest adjustment easier. Furthermore, while meeting the requirements for large deformation, the diameter of the second bend of the S-shaped frame can be set smaller, resulting in less space occupation and a more aesthetically pleasing appearance.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. When the height of the adjustable chair seat is raised, the S-shaped structure elongates in the vertical direction. Because the S-shaped structure has greater elastic deformation and can stretch and deform in the vertical direction, it has a short back shape when the seat is lowered and a long back shape when it is raised. The shape changes with the height. The S-shaped design makes the chair back more flexible in use and ensures the visual integrity of the chair back.

[0032] 2. The backrest frame has a space in the middle, which reduces the weight of the backrest frame while ensuring strength, and saves materials and reduces costs while maintaining overall strength. After the backrest is connected to the backrest frame, the shape of the backrest changes with the S-shaped frame. After the user adjusts the height, it not only maintains the integrity, but the backrest also forms a curved protrusion following the S-shaped frame. When leaning against the backrest, this curved protrusion acts as a cushion, so the user does not need to use a cushion and avoids the trouble of the cushion falling off. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of a height-adjustable chair back in an embodiment of this application;

[0034] Figure 2 This is a side view of the backrest structure of a height-adjustable chair;

[0035] Figure 3 This is a structural diagram illustrating the main structure of the chair back.

[0036] Explanation of reference numerals in the attached drawings: 1. Height-adjustable seat; 11. Seat cushion frame; 12. Seat cushion; 13. Backrest connection part; 2. Backrest body; 21. Backrest frame body; 211. Cam; 22. Back panel; 221. First back panel; 222. Second back panel; 223. Cam hole; 224. Texture; 23. S-shaped frame; 231. First bend; 232. Second bend; 233. Buffer groove; 234. Connecting hole; 24. Adjustment space. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0038] This application discloses a height-adjustable chair backrest. (Refer to...) Figure 1 and Figure 2 The adjustable chair back includes an adjustable seat 1 and a backrest body 2. The adjustable seat includes a seat cushion 12 frame 11, a seat cushion 12 mounted on the seat cushion 12 frame 11, and a backrest connecting part 13 disposed on the seat cushion 12 frame 11. The backrest connecting part 13 includes a first mounting part and a second mounting part, which are used to mount the backrest body 2. The backrest body 2 includes a backrest frame main body 21, a back panel 22 partially connected to the backrest frame main body 21, and an S-shaped frame 23 disposed between the backrest frame main body 21 and the back panel 22. An adjustment space 24 exists between the backrest frame main body 21 and the back panel 22, and the S-shaped part of the S-shaped frame 23 is located within the adjustment space 24.

[0039] The backrest connection 13 is L-shaped, with a first mounting part arranged horizontally and a second mounting part arranged vertically. The first mounting part is connected to the seat cushion 12 frame 11. The bottom of the backrest frame body 21 is provided with a telescopic cavity, which is fitted onto the second mounting part, allowing the backrest frame body 21 to be adjusted vertically. The telescopic cavity provides bending space for the S-shaped frame 23 when adjusting the backrest height, increasing the service life of the seat.

[0040] The backrest frame 21 is installed at the first mounting part at one end near the seat body, and the S-shaped frame 23 is installed at the second mounting part at one end near the seat body. When the height of the backrest body is increased, the shape of the S-shaped frame 23 extends; when the height of the seat is decreased, the shape of the S-shaped frame 23 is compressed. When the backrest height is increased, the S-shape undergoes elongation deformation in the vertical direction. Due to the greater elastic deformation of the S-shape and its ability to stretch and deform vertically, the backrest is short when the seat is lowered and long when it is raised, changing shape with height. This S-shaped design makes the backrest more flexible in use and ensures the visual integrity of the backrest.

[0041] The backrest frame body 21 is a frame with a space in the middle. A cam 211 is provided between the backrest frame body 21 and the S-shaped frame 23. The backrest frame body 21 is provided with connecting ears for mounting the cam 211. The back panel 22 is provided with a mounting ear at the end near the adjustable chair seat. The mounting ear has a hole for the cam 211. When the back panel 22 is installed with the backrest frame body 21, the cam 211 is located in the hole of the cam 211. The space in the middle of the backrest frame body 21 serves two purposes: first, it can reduce the weight of the backrest frame body 21 while ensuring strength; second, it can save materials and reduce costs while maintaining overall strength. After the back panel 22 is connected to the backrest frame, the shape of the back panel 22 changes along with the S-shaped frame 23. After the user adjusts the height, not only is the overall integrity maintained, but the back panel 22 also forms a curved protrusion following the change of the S-shaped frame 23. When leaning against the backrest, this curved protrusion acts as a cushion, eliminating the need for a cushion and avoiding the inconvenience of the cushion falling off.

[0042] In an optional embodiment, the S-shaped frame 23 includes a first curved portion 231 and a second curved portion 232. The second curved portion 232 is close to the adjustable chair seat. The first curved portion 231 is connected to the second curved portion 232 and is located above the second curved portion 232. The first curved portion 231 and the second curved portion 232 have opposite bending directions. The lower half of the back panel 22 is flush with the first curved portion 231. The lower part of the back panel 22 is flush with the first curved portion 231 and forms a convex arc shape with the first curved portion 231, which not only ensures the overall visual effect but also helps to improve comfort. It supports the user's back during use. When adjusting the chair back height, the position and curvature of the first curved portion 231 will also change, which can meet the needs of different heights during the lifting process.

[0043] In an optional embodiment, the back panel 22 is uniformly textured with a texture 224. The texture 224 ensures comfort when the back panel 22 bends. The upper part of the back panel 22 is a first back panel 221, and the lower part is a second back panel 222. The thickness of the first back panel 221 is less than the thickness of the second back panel 222. The texture 224 on the back panel 22 has a special shape, which reduces discomfort and improves lumbar and back comfort when the back panel 22 bends. The fact that the thickness of the first back panel 221 is less than the thickness of the second back panel 222 allows the first back panel 221 to fit and wrap around the back more comfortably, while the second back panel 222 can support the waist, which is ergonomic.

[0044] The first curved portion 231 has an arc, and the second curved portion 232 has multiple buffer grooves 233 evenly distributed on its side near the adjustable chair seat. The arc of the first curved portion 231 mainly serves a supporting function, while the buffer grooves 233 are mainly used to increase the adjustment space 24, so that the second curved portion 232 can achieve a better curvature while reducing stress. In a preferred embodiment, the buffer grooves 233 are L-shaped. The specially shaped grooves increase the deformation of the second curved portion 232.

[0045] The lower end of the S-shaped frame 23 is provided with an ear plate, and the ear plate has a connecting hole 234. The S-shaped frame 23 is rotatably connected to the first mounting part through the connecting hole 234. Preferably, the S-shaped frame 23 is rotatably connected to the rear end of the seat cushion 12 frame 11 through the connecting hole 234. The lower end of the S-shaped frame 23 can be rotatably connected to the rear end of the seat cushion 12 frame 11 or the backrest connecting part 13. This can better accommodate the elongation and deformation of the S-shaped frame 23, making it easier to adjust the backrest. In addition, while meeting the requirements of large deformation, the diameter of the second curved part 232 of the S-shaped frame 23 can be set to be small, occupying less space and being more aesthetically pleasing.

[0046] In an optional embodiment, the S-shaped frame 23 is made of ultra-tough nylon material. In a preferred embodiment, the entire outer surface of the S-shaped frame 23 is covered with fabric; aesthetically, the backrest provides a smooth visual transition during height adjustment, eliminating the visual discontinuity problem in traditional designs, making it more aesthetically pleasing, and preventing users from easily obstructing additional backrests placed between the backrest and the seat cushion 12.

[0047] Optionally, a height positioning structure is provided between the backrest frame body 21 and the backrest connection part 13. This height positioning structure can lock the height position of the backrest. Adjusting the backrest prevents height changes that could cause inconvenience. The height positioning structure includes a rack, a first redirecting structure, and a second redirecting structure. The rack is located on the backrest connection part 13, the first redirecting structure is located at the upper end of the rack, and the second redirecting structure is located at the lower end of the rack. The backrest frame body is provided with elastic locking teeth that cooperate with the rack for locking.

[0048] When the user pulls the chair back frame upwards, the elastic locking teeth move upwards along the rack. When the upward pulling stops, the elastic locking teeth, under the action of the spring, engage with the rack and lock in the current position. When the elastic locking teeth align with the upper end of the rack, they touch the first redirecting structure, thus keeping the elastic locking teeth in a retracted state. At this time, the chair back frame can descend smoothly. When it descends to the lower end of the rack, the elastic locking teeth contact the second redirecting structure, causing the elastic locking teeth to pop out from the retracted state and engage with the rack for locking. When the chair back is pulled out to its highest point and lowered, because the elastic locking teeth are in the retracted state, the chair back will fall directly. However, due to the presence of the S-shaped frame 23, this direct fall motion is cushioned, thus avoiding the impact noise caused by the chair back falling directly, or even injuring someone.

[0049] The implementation principle of this application embodiment is as follows: When the chair back height is raised, the S-shape undergoes elongation deformation in the height direction. Since the S-shape has greater elastic deformation and can stretch and deform in the vertical direction, the chair back is short when the seat 1 is lowered and long when it is raised. The shape changes with the height. The S-shape makes the chair back more flexible in use and ensures the visual integrity of the chair back. The backrest frame body 21 has a space in the middle. First, it can reduce the weight of the backrest frame body 21 while ensuring strength. Second, it can save materials and reduce costs while ensuring overall strength. After the back panel 22 is connected to the backrest frame, the shape of the back panel 22 changes with the S-shaped frame 23. After the user adjusts the height, not only is the integrity maintained, but the back panel 22 also changes with the S-shaped frame 23 to form an arc-shaped protrusion. When leaning against the chair back, this arc-shaped protrusion acts as a cushion, so that the user does not need to use a cushion and avoids the trouble of the cushion falling off.

[0050] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lifting chair back, characterized in that include: The adjustable chair includes a seat frame (11), a seat cushion (12) mounted on the seat frame (11), and a backrest connection part (13) disposed on the seat frame (11). The backrest connection part (13) includes a first mounting part and a second mounting part, which are used to install other components. The backrest body (2) includes a backrest frame body (21), a back panel (22) partially connected to the backrest frame body (21), and an S-shaped frame (23) disposed between the backrest frame body (21) and the back panel (22). There is an adjustment space (24) between the backrest frame body (21) and the back panel (22), and the S-shaped part of the S-shaped frame (23) is located within the adjustment space (24). The backrest frame body (21) is installed at the first mounting part at one end near the seat body, and the S-shaped frame (23) is installed at the second mounting part at one end near the seat body. When the height of the backrest body is increased, the shape of the S-shaped frame (23) is extended, and when the height of the lifting seat is decreased, the shape of the S-shaped frame (23) is compressed. The S-shaped frame (23) includes a first curved portion (231) and a second curved portion (232). The second curved portion (232) is close to the lifting chair seat. The first curved portion (231) is connected to the second curved portion (232) and is located above the second curved portion (232). The first curved portion (231) and the second curved portion (232) have opposite bending directions. The lower half of the back panel (22) is flush with the first curved portion (231). The backrest connecting part (13) is L-shaped, the first mounting part is arranged horizontally, the second mounting part is arranged vertically, and the first mounting part is connected to the seat cushion frame (11); the bottom of the backrest frame body (21) is provided with a telescopic cavity, and the telescopic cavity is fitted on the second mounting part, so that the backrest frame body (21) can be adjusted in the up and down direction. The lower end of the S-shaped frame (23) is provided with an ear plate, and a connecting hole (234) is provided on the ear plate. The S-shaped frame (23) is rotatably connected to the first mounting part through the connecting hole (234).

2. The lift chair back of claim 1, wherein: The backrest frame body (21) is a frame with a space in the middle. A cam (211) is provided between the backrest frame body (21) and the S-shaped frame (23). The backrest frame body (21) is provided with a connecting ear for mounting the cam (211). The back panel (22) is provided with a mounting ear at one end near the lifting chair seat. A cam (211) hole is opened on the mounting ear. When the back panel (22) is installed with the backrest frame body (21), the book-searching cam (211) is located in the cam (211) hole.

3. The lift chair back of claim 2, wherein: The back panel (22) is uniformly provided with texture (224), which ensures comfort when the back panel (22) is bent. The upper part of the back panel (22) is a first back panel (221), and the lower part of the back panel (22) is a second back panel (222). The thickness of the first back panel (221) is less than the thickness of the second back panel (222).

4. The lift chair back of claim 2, wherein: The first curved portion (231) has an arc, and the second curved portion (232) has a plurality of buffer grooves (233) evenly provided on the side near the lifting chair seat.

5. A lifting chair back as claimed in claim 4, characterised in that: The buffer groove (233) is L-shaped.

6. A lifting chair backrest according to claim 5, characterised in that: A height positioning structure is provided between the main body (21) of the backrest frame and the backrest connection part (13), which can lock the height position of the backrest.

7. The lift chair back of claim 1, wherein: The S-shaped frame (23) is rotatably connected to the rear end of the seat cushion frame (11) through the connecting hole (234).

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