Height-adjustable chair back

Abstract

A height-adjustable chair back, comprising a height-adjustable chair seat (1), which comprises a seat cushion frame (11), a seat cushion (12) mounted on the seat cushion frame (11), and a chair back connecting portion (13) arranged on the seat cushion frame (11), wherein the chair back connecting portion (13) comprises a first mounting portion and a second mounting portion, the first mounting portion and the second mounting portion being used for mounting other components. A chair back body (2) comprises a backrest frame main body (21), a back panel (22), and an S-shaped frame body (23) arranged between the backrest frame main body (21) and the back panel (22), wherein there is an adjustment space (24) between the backrest frame main body (21) and the back panel (22), and an S-shaped part of the S-shaped frame body (23) is located in the adjustment space (24). The end of the backrest frame main body (21) close to the height-adjustable chair seat (1) is mounted at the first mounting portion, and the end of the S-shaped frame body (23) close to the height-adjustable chair seat (1) is mounted at the second mounting portion. When the height of the chair back body (2) increases, the S-shaped frame body (23) is in an extended shape; and when the height of the chair back body (2) decreases, the S-shaped frame body (23) is in a compressed shape.

Description

[Rule 91 correction 18.06.2025] A lifting chair backrest [Rule 91 correction 18.06.2025] TECHNICAL FIELD

[0001] [Rule 91 correction 18.06.2025] The present application relates to the field of seat structures, and in particular to a lifting chair backrest. [Rule 91 correction 18.06.2025] BACKGROUND

[0002] [Rule 91 correction 18.06.2025] A lifting chair is a new type of chair, which is mainly composed of a seat plate, a backrest, a support, a support rocker arm, a lifting positioning device and a chair leg. The support and the chair leg are correspondingly hinged by the support rocker arm, the support rocker arm rotates up and down around the hinge shaft hinged on the chair leg as the center, and when the support rocker arm is rocked, the support is lifted to realize the lifting of the seat plate. In addition, a lifting positioning device is arranged between the support and the chair leg. The current lifting chair has various classifications and has been widely popularized in people's work and study and production places. It has certain ergonomics and is beneficial to health.

[0003] [Rule 91 correction 18.06.2025] With the increasing time of working from home and playing, the stereotyped and equation-like office space has been unable to meet people's needs. Therefore, there are more and more office desks and chairs that pay attention to personal development and focus on humanization in terms of color variety, unique modeling, and convenient use, but only modeling or only function is not enough, and both professionalization and personalization are needed. When working, the office desk or workbench needs to be adjusted to the appropriate height according to the nature of the work. Because different office desk heights have different requirements for the placement of the chair, sometimes even a different chair is needed. The current market has various designs of chairs, among which the design of the chair backrest is crucial for the comfort and use experience of the user. Traditional chair backrest designs often use fixed structures that cannot be flexibly adjusted according to user needs, and have deficiencies in visual effect and cleaning convenience. [Rule 91 correction 18.06.2025] SUMMARY

[0004] [Rule 91 correction 18.06.2025] In order to make the chair backrest more flexible in use, the present application provides a lifting chair backrest.

[0005] [Rule 91 correction 18.06.2025] The application provides a lifting chair backrest, which adopts the following technical solutions: a lifting chair backrest, comprising: a lifting chair seat, including a cushion framework, a cushion installed on the cushion framework, and a backrest connecting part provided on the cushion framework, the backrest connecting part includes a first mounting part and a second mounting part, and the first mounting part and the second mounting part are used to mount other components; a backrest body, including a backrest framework main body, a back plate connected with the backrest framework main body, and an S-shaped frame body provided between the backrest framework main body and the back plate, there is an adjustment space between the backrest framework main body and the back plate, and the S-shaped part of the S-shaped frame body is located in the adjustment space; wherein, one end of the backrest framework main body close to the lifting chair seat is installed at the first mounting part, one end of the S-shaped frame body close to the lifting chair seat is installed at the second mounting part, when the height of the backrest body is raised, the shape of the S-shaped frame body is stretched, and when the height of the backrest body is lowered, the shape of the S-shaped frame body is compressed.

[0006] [Rule 91 correction 18.06.2025] Preferably, the backrest framework main body is a frame body with a space in the middle, a cam is provided between the backrest framework main body and the S-shaped frame body, and a connecting lug for mounting the cam is provided on the backrest framework main body; one end of the back plate close to the lifting chair seat is provided with a mounting lug, a cam hole is formed in the mounting lug, and the cam is located in the cam hole when the back plate is installed with the backrest framework main body.

[0007] [Rule 91 correction 18.06.2025] Preferably, the S-shaped frame body includes a first curved part and a second curved part, the second curved part is close to the lifting chair seat, the first curved part is connected with the second curved part and located above the second curved part, the bending directions of the first curved part and the second curved part are opposite, and the lower half of the back plate is flush with the first curved part.

[0008] [Rule 91 correction 18.06.2025] Preferably, the back plate is uniformly provided with textures, the textures ensure comfort after the back plate is bent, the upper part of the back plate is a first back plate, the lower part of the back plate is a second back plate, and the thickness of the first back plate is less than the thickness of the second back plate.

[0009] [Rule 91 correction 18.06.2025] Preferably, the first curved part has an arc, and a plurality of buffer grooves are uniformly formed on one side of the second curved part close to the lifting chair seat.

[0010] [Rule 91 correction 18.06.2025] Preferably, the buffer grooves are L-shaped.

[0011] [Rule 91 correction 18.06.2025] Preferably, the chair back connecting part 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 framework; the backrest framework body is provided with an extension cavity at the bottom, the extension cavity is sleeved on the second mounting part, so that the backrest framework body can be adjusted up and down.

[0012] [Rule 91 correction 18.06.2025] Preferably, a height positioning structure is arranged between the backrest framework body and the chair back connecting part, and the height positioning structure can lock the height position of the chair back.

[0013] [Rule 91 correction 18.06.2025] Preferably, the lower end of the S-shaped frame body is provided with an ear plate, a connecting hole is formed in the ear plate, and the S-shaped frame body is rotatably connected to the first mounting part through the connecting hole.

[0014] [Rule 91 correction 18.06.2025] Preferably, the S-shaped frame body is rotatably connected to the rear end of the seat cushion framework through the connecting hole.

[0015] [Rule 91 correction 18.06.2025] In summary, the present application has at least one of the following beneficial technical effects: 1. When the chair back body is raised, the S-shaped part is elongated in the height direction. Due to the greater elastic deformation of the S-shaped part and the structure that the S-shaped part can be vertically deformed, the chair back body is short when it is lowered and long when it is raised. The shape changes with the height. The use of the S-shaped part makes the chair back more flexible in use and ensures the overall visual integrity of the chair back. 2. The backrest framework body has a space in the middle. On the one hand, it can reduce the weight of the backrest framework body while ensuring strength, and on the other hand, it can save materials and reduce costs while ensuring overall strength. After the back plate is connected to the backrest framework, the shape of the back plate changes with the S-shaped frame body. After adjusting the height, the user not only ensures the overall integrity, but also forms a convex part with an arc by changing the S-shaped frame body. When leaning against the chair back, the convex part with an arc acts as a back cushion, so that the user does not need to use a back cushion, avoiding the trouble of dropping the back cushion. [Rule 91 correction 18.06.2025] BRIEF DESCRIPTION OF DRAWINGS

[0016] [Rule 91 correction 18.06.2025] FIG. 1 is a schematic view of the overall structure of the chair back of the lifting chair in an embodiment of the present application;

[0017] [Rule 91 correction 18.06.2025] FIG. 2 is a schematic view of the side structure of the lifting chair chair back;

[0018] [Rule 91 Correction 18.06.2025] FIG. 3 is a structural diagram embodying the structure of the chair back body.

[0019] [Rule 91 Correction 18.06.2025] Marked for explanation: 1, lifting chair seat; 11, cushion framework; 12, cushion; 13, chair back connecting part; 2, chair back body; 21, backrest framework main body; 211, cam; 22, back plate; 221, first back plate; 222, second back plate; 223, cam hole; 224, texture; 23, S-shaped frame body; 231, first curved part; 232, second curved part; 233, buffer groove; 234, connecting hole; 24, adjustment space. [Rule 91 Correction 18.06.2025] DETAILED DESCRIPTION

[0020] [Rule 91 Correction 18.06.2025] The present application is further described in detail below in conjunction with FIGS. 1-3.

[0021] [Rule 91 Correction 18.06.2025] The embodiment of the present application discloses a lifting chair back. Referring to FIGS. 1 and 2, the lifting chair back comprises a lifting chair seat 1 and a chair back body 2. The lifting chair seat 1 comprises a cushion framework 11, a cushion 12 mounted on the cushion framework 11, and a chair back connecting part 13 arranged on the cushion framework 11, the chair back connecting part 13 comprising a first mounting part and a second mounting part, the first mounting part and the second mounting part being used for mounting the chair back body 2. The chair back body 2 comprises a backrest framework main body 21, a back plate 22 connected with the backrest framework main body 21 in part, and an S-shaped frame body 23 arranged between the backrest framework main body 21 and the back plate 22, there being an adjustment space 24 between the backrest framework main body 21 and the back plate 22, and an S-shaped part of the S-shaped frame body 23 being located in the adjustment space 24.

[0022] [Rule 91 Correction 18.06.2025] The chair back 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 cushion framework 11; the backrest framework main body 21 is provided with an expansion cavity at the bottom, the expansion cavity is sleeved on the second mounting part, so that the backrest framework main body 21 can be adjusted in the up-down direction. The expansion cavity provides a bending space for the S-shaped frame body 23 when adjusting the backrest height, thereby increasing the service life of the seat.

[0023] [According to the rules 91 correction 18.06.2025] The end of the backrest skeleton body 21 close to the lifting chair seat 1 is installed at the first mounting part, and the end of the S-shaped frame body 23 close to the lifting chair seat 1 is installed at the second mounting part. When the height of the chair back body 2 is raised, the shape of the S-shaped frame body 23 is stretched, and when the height of the chair back body 2 is lowered, the shape of the S-shaped frame body 23 is compressed. When the height of the chair back is raised, the S-shaped frame body 23 is elongated in the height direction, and due to the elastic deformation of the S-shaped frame body 23, the S-shaped frame body 23 can be deformed in the vertical direction. Therefore, when the chair back body 2 is lowered, it is a short back shape, and when it is raised, it is a long back shape. The shape changes with the height, and the chair back is more flexible in use through the arrangement of the S-shaped frame body 23, and the overall visual integrity of the chair back is ensured.

[0024] [According to the rules 91 correction 18.06.2025] The backrest skeleton body 21 is a frame body with a space in the middle, and a cam 211 is arranged between the backrest skeleton body 21 and the S-shaped frame body 23. The backrest skeleton body 21 is provided with a connecting lug for mounting the cam 211. The end of the back plate 22 close to the lifting chair seat 1 is provided with a mounting lug, and a cam hole is formed in the mounting lug. When the back plate 22 is installed with the backrest skeleton body 21, the cam 211 is located in the cam hole. The backrest skeleton body 21 has a space in the middle, which can reduce the weight of the backrest skeleton body 21 while ensuring strength, and can save materials and reduce costs while ensuring overall strength. After the back plate 22 is connected with the backrest skeleton body 21, the shape of the back plate 22 changes with the S-shaped frame body 23. After adjusting the height, the user not only ensures the overall integrity, but also changes the back plate 22 with the S-shaped frame body 23 to form a convex arc, which plays the role of a back cushion when leaning on the back, so that the user does not need to use a back cushion, avoiding the trouble of dropping the back cushion.

[0025] [According to the rules 91 correction 18.06.2025] In an optional embodiment, the S-shaped frame body 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 1, the first curved portion 231 is connected with the second curved portion 232 and located above the second curved portion 232, the bending directions of the first curved portion 231 and the second curved portion 232 are opposite, and the lower half of the back plate 22 is flush with the first curved portion 231. The lower part of the back plate 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 the comfort. When adjusting the height of the chair back, the position and arc of the first curved portion 231 will change, and different height requirements can be met during lifting.

[0026] [According to the rules 91 correction 18.06.2025] In an optional embodiment, the back plate 22 is uniformly provided with a texture 224, which ensures comfort after bending the back plate 22. The upper part of the back plate 22 is a first back plate 221, and the lower part of the back plate 22 is a second back plate 222. The thickness of the first back plate 221 is less than that of the second back plate 222. The texture 224 provided on the back plate 22 is of a special shape, which reduces discomfort and improves the comfort of the waist and back after bending the back plate 22. The thickness of the first back plate 221 is less than that of the second back plate 222, which can make the first back plate 221 fit and wrap the back more comfortably, while the second back plate 222 can support the waist and conform to the ergonomics.

[0027] [According to the rules 91 correction 18.06.2025] The first curved part 231 has an arc, and the second curved part 232 is uniformly provided with a plurality of buffer grooves 233 on one side of the lifting chair seat 1. The arc of the first curved part 231 mainly serves as a support, while the buffer grooves 233 are mainly used to increase the adjustment space 24, so that the second curved part 232 can achieve a better bending degree while reducing stress. In a preferred embodiment, the buffer grooves 233 are L-shaped. The special-shaped grooves increase the deformation amount of the second curved part 232.

[0028] [According to the rules 91 correction 18.06.2025] The S-shaped frame 23 is provided with an ear plate at the lower end, and the ear plate is provided with 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 cushion framework 11 through the connecting hole 234. The lower end of the S-shaped frame 23 is rotatably connected to the rear end of the cushion framework 11 or the chair back connecting part 13, which can better comply with the elongation and deformation of the S-shaped frame 23, making it easier to adjust the chair back. In addition, while meeting the requirement of large deformation amount, the diameter of the second curved part 232 of the S-shaped frame 23 can be set small, occupying less space and being more beautiful.

[0029] [According to the rules 91 correction 18.06.2025] In an optional embodiment, the S-shaped frame 23 needs to be made of super-tough nylon material. In a preferred embodiment, the outer surface of the S-shaped frame 23 is entirely wrapped in fabric. The appearance of the chair back is smooth and visually transitions when adjusting the height, eliminating the visual discontinuity problem in traditional designs, making it more beautiful. Moreover, the chair back and the cushion 12 are less likely to get stuck with the user's additional placed backrest.

[0030] [According to the rules 91 correction 18.06.2025] Optionally, the backrest skeleton body 21 and the chair back connecting part 13 are provided with a height positioning structure, which can lock the height position of the chair back. After adjusting the chair back, it can prevent the chair back from being unpositioned and causing inconvenience due to height change. The height positioning structure includes a rack, a first redirection structure and a second redirection structure, the rack is arranged on the chair back connecting part 13, the first redirection structure is arranged at the upper end of the rack, and the second redirection structure is arranged at the lower end of the rack. The backrest skeleton body 21 is provided with elastic locking teeth, which cooperate with the rack to lock.

[0031] [According to the rules 91 correction 18.06.2025] The user pulls the backrest skeleton body 21 upwards, and the elastic locking teeth can move upwards along the rack. When the upward pulling is stopped, the elastic locking teeth can be locked in the current position by cooperating with the rack under the action of the spring. When the elastic locking teeth are aligned to the end of the upper end of the rack, the first redirection structure is touched, so that the elastic locking teeth remain in the retracted state, at this time the backrest skeleton body 21 can be lowered smoothly, and when it is lowered to the end of the lower end of the rack, the elastic locking teeth are in contact with the second redirection structure, so that the elastic locking teeth are popped out from the retracted state, so that the elastic locking teeth can be engaged and locked with the rack. When the chair back body 2 is pulled away to the uppermost end and is lowered, since the elastic locking teeth are in the retracted state, the chair back body 2 will directly fall down, and since there is the S-shaped frame body 23, the direct falling movement can be buffered, so as to avoid the impact sound caused by the direct falling of the chair back body 2, and even to avoid hurting people.

[0032] [According to the rules 91 correction 18.06.2025] The implementation principle of the embodiment of the application is that when the chair back body 2 is raised in height, the S-shaped structure is elongated in the height direction. Since the S-shaped structure has greater elastic deformation and can be deformed in the vertical direction, the chair back body 2 is a short back shape when it is lowered and a long back shape when it is raised. The shape changes with the height. The S-shaped structure makes the chair back more flexible in use and ensures the overall visual integrity of the chair back. The backrest skeleton body 21 has a space in the middle. On the one hand, it can reduce the weight of the backrest skeleton body 21 while ensuring the strength, and on the other hand, it can save materials and reduce costs while ensuring the overall strength. After the back plate 22 is connected with the backrest skeleton, the shape of the back plate 22 changes with the S-shaped frame body 23. After the user adjusts the height, the back plate 22 changes with the S-shaped frame body 23 to form a convex part with an arc, which plays the role of a back cushion when the user leans against the chair back, so that the user does not need to use a back cushion, avoiding the trouble of dropping the back cushion.

[0033] [Rule 91 correction 18.06.2025] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made in structure, shape, principle, etc. according to the present application shall be covered within the protection scope of the present application.

Claims

1. [Amended according to Rule 91 on 18.06.2025] A lifting chair back, characterized in that The utility model relates to a lifting chair seat (1) including a cushion framework (11), a cushion (12) installed on the cushion framework (11), and a chair back connecting part (13) arranged on the cushion framework (11), the chair back connecting part (13) including a first mounting part and a second mounting part, the first mounting part and the second mounting part are used for mounting other components. The utility model relates to a chair back body (2) including a backrest framework main body (21), a back plate (22) connected with the backrest framework main body (21) partially, and an S-shaped frame body (23) arranged between the backrest framework main body (21) and the back plate (22), there is an adjustment space (24) between the backrest framework main body (21) and the back plate (22), and the S-shaped part of the S-shaped frame body (23) is located in the adjustment space (24); wherein, the backrest framework main body (21) is installed at the first mounting part near one end of the lifting chair seat (1), the S-shaped frame body (23) is installed at the second mounting part near one end of the lifting chair seat (1), when the height of the chair back body (2) is raised, the shape of the S-shaped frame body (23) is stretched, the height of the chair back body (2) is lowered, and the shape of the S-shaped frame body (23) is compressed. The backrest framework main body (21) is a frame body with a space in the middle, a cam (211) is arranged between the backrest framework main body (21) and the S-shaped frame body (23), and a connecting lug for mounting the cam (211) is arranged on the backrest framework main body (21).

2. [Amended according to Rule 91 on 18.06.2025] The lifting chair backrest according to claim 1, characterized in that: One end of the back plate (22) near the lifting chair seat (1) is provided with a mounting lug, a cam hole is formed in the mounting lug, and the cam (211) is located in the cam hole when the back plate (22) is mounted with the backrest framework main body (21). The S-shaped frame body (23) includes a first curved part (231) and a second curved part (232), the second curved part (232) is close to the lifting chair seat (1), the first curved part (231) is connected with the second curved part (232) and located above the second curved part (232), the bending directions of the first curved part (231) and the second curved part (232) are opposite, and the lower half of the back plate (22) is flush with the first curved part (231).

3. [Amended according to Rule 91 on 18.06.2025] The chair back of claim 2, characterized in that: The back plate (22) is uniformly provided with textures (224), the textures (224) ensure comfort after the back plate (22) is bent, the upper part of the back plate (22) is a first back plate (221), the lower part of the back plate (22) is a second back plate (222), and the thickness of the first back plate (221) is smaller than that of the second back plate (222).

4. [Amended according to Rule 91 on 18.06.2025] The chair back of claim 3, characterized in that: The first curved part (231) has an arc, and a plurality of buffer grooves (233) are uniformly formed in one side of the second curved part (232) close to the lifting chair seat (1).

5. [Amended according to Rule 91 on 18.06.2025] The chair back of claim 3, characterized in that: The buffer grooves (233) are L-shaped.

6. [Amended according to Rule 91 on 18.06.2025] The chair back of claim 5, characterized in that: ​ 7. [Amended according to Rule 91 on 18.06.2025] The chair back of claim 6, characterized in that: The chair back connecting part (13) is L-shaped, the first mounting part is transversely arranged, the second mounting part is vertically arranged, and the first mounting part is connected to the cushion framework (11); the bottom of the backrest framework body (21) is provided with an expansion cavity, the expansion cavity is sleeved on the second mounting part, so that the backrest framework body (21) can be adjusted in the up-down direction.

8. [Amended according to Rule 91 on 18.06.2025] The lifting chair backrest according to claim 7, characterized in that: The height positioning structure is arranged between the backrest framework body (21) and the chair back connecting part (13), and can lock the height position of the chair back.

9. [Amended according to Rule 91 on 18.06.2025] The lifting chair backrest according to claim 7, characterized in that: The S-shaped frame body (23) is provided with an ear plate at the lower end, the ear plate is provided with a connecting hole (234), and the S-shaped frame body (23) is rotatably connected to the first mounting part through the connecting hole (234).

10. [Amended according to Rule 91 on 18.06.2025] The lifting chair backrest according to claim 9, characterized in that: The S-shaped frame body (23) is rotatably connected to the rear end of the cushion framework (11) through the connecting hole (234).

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