Chair backrest of a height-adjustable chair

Abstract

This application relates to the field of chair mechanisms, and more particularly to the chair backrest of a lift chair, and includes a cushion frame, a cushion mounted on the cushion frame, and a chair backrest connecting part provided on the cushion frame, wherein the chair 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 attach other members to the lift chair seat, backrest frame body, back plate, and provided between the backrest frame body and the back plate. The present invention includes an S-shaped frame, and an adjustable space exists between the backrest frame body and the backrest board, with the S-shaped portion of the S-shaped frame body located within the adjustable space, wherein one end of the backrest frame body closer to the chair seat body is attached to a first mounting part, and the other end of the S-shaped frame body closer to the chair seat body is attached to a second mounting part, and when the height of the chair backrest body increases, the shape of the S-shaped frame body expands, and when the height of the chair backrest body decreases, the shape of the S-shaped frame body is compressed. The present invention has the effect of making the chair backrest more flexible when in use.

Description

Technical Field

[0001] This application relates to the field of chair structures, and particularly to the chair backrest of a lift chair.

Background Art

[0002] A lift chair is a new type of chair, mainly composed of a seat plate, a backrest, a holder, a holder swing arm, a lift positioning device, and chair legs, and its features are as follows. Between the holder and the chair legs, they are correspondingly hinged by the holder swing arm. The holder swing arm rotates up and down with the hinge connecting shaft hinged to the chair legs as the center. When the holder swing arm swings, the holder is lifted and lowered to realize the lifting and lowering of the seat plate. Also, a lift positioning device is further provided between the holder and the chair legs. Current lift chairs have various types and are widely popular in people's work, study, and production places. They have certain ergonomic performance and are beneficial to health.

[0003] The time spent working or playing games at home is increasing, and the monotonous and fixed pattern of the office space can no longer meet people's needs. Therefore, there are more and more desks and chairs for work that emphasize personalized development and focus on people-centered, with diverse colors, unique shapes, and easy to use. However, having only form and function is insufficient, and it is necessary to equally emphasize specialization and personalization. When working, first, adjust the office desk or workbench to an appropriate height according to the nature of the work. Due to the different required placement positions of the chair according to the height of the office desk, in some cases, it is necessary to replace the chair. Currently, the designs of chairs in the market are diverse. Among them, the design of the chair backrest is important for the comfort and usage experience of the user. The conventional design of the chair backrest always adopts a fixed structure and cannot be flexibly adjusted according to the needs of the user, and there are deficiencies in terms of visual effects and cleaning convenience.

Summary of the Invention

Problems to be Solved by the Invention

[0004] To provide greater flexibility when using the chair backrest, this invention provides a chair backrest for a height-adjustable chair. [Means for solving the problem]

[0005] The chair backrest of the height-adjustable chair according to this invention adopts the following technical design. It is the backrest of a chair for a height-adjustable chair. The chair seat includes a cushion frame, a cushion mounted on the cushion frame, and a chair backrest connecting portion provided on the cushion frame, wherein the chair backrest connecting portion includes a first mounting portion and a second mounting portion, and the first mounting portion and the second mounting portion are used to attach other members. The chair backrest includes a backrest frame body, a back panel partially connected to the backrest frame body, and an S-shaped frame provided between the backrest frame body and the back panel, wherein an adjustment space exists between the backrest frame body and the back panel, and the S-shaped portion of the S-shaped frame is located within the adjustment space. Here, one end of the backrest frame body closest to the seat of the adjustable chair is attached to the first mounting part, and one end of the S-shaped frame body closest to the seat of the adjustable chair is attached to the second mounting part. When the height of the chair backrest body increases, the shape of the S-shaped frame body expands, and when the height of the chair backrest body decreases, the shape of the S-shaped frame body is compressed.

[0006] Preferably, the backrest frame body is a frame having a space in the middle, a cam is provided between the backrest frame body and the S-shaped frame, and the backrest frame body is provided with connecting lugs for attaching the cam. An attachment lug is provided at one end of the backrest closest to the seat of the adjustable chair, and a cam hole is provided in the attachment lug. When the backrest is attached to the backrest frame body, the cam is positioned within the cam hole.

[0007] Preferably, the S-shaped frame includes a first curved portion and a second curved portion, the second curved portion being close to the seat of the liftable chair, the first curved portion being connected to the second curved portion and the first curved portion being located above the second curved portion, the first and second curved portions being separated in their curvature directions, and the lower half of the backrest becoming flush with the first curved portion.

[0008] Preferably, the back panel is uniformly textured, the texture ensures comfort after the back panel has curved, the upper part of the back panel is a first back panel, the lower part of the back panel is a second back panel, and the thickness of the first back panel is less than the thickness of the second back panel.

[0009] Preferably, the first curved portion has an arc, and a plurality of cushioning grooves are uniformly formed on one surface of the second curved portion closest to the seat of the liftable chair.

[0010] Preferably, the buffer groove is L-shaped.

[0011] Preferably, the backrest connecting portion is L-shaped, the first mounting portion is provided in the lateral direction, the second mounting portion is provided in the vertical direction, and the first mounting portion is connected to the cushion frame. An expandable cavity is provided at the bottom of the backrest frame body, and by fitting the expandable cavity onto the second mounting portion, the backrest frame body can be adjusted to be pulled in the vertical direction.

[0012] Preferably, a height positioning structure is provided between the backrest frame body and the chair backrest connecting portion, and the height positioning structure can lock the height position of the chair backrest.

[0013] Preferably, a plate lug is provided at the lower end of the S-shaped frame, a connecting hole is provided in the plate lug, and the S-shaped frame is rotatably connected to the first mounting portion via the connecting hole.

[0014] Preferably, the S-shaped frame is rotatably connected to the rear end of the cushion frame via the connecting hole. [Effects of the Invention]

[0015] In summary, this application includes at least one of the following beneficial technical effects. 1. When the height of the adjustable chair seat increases, the S-shape expands and deforms in the height direction, and the elastic deformation of the S-shape is greater. Furthermore, because the S-shape is a structure that can expand and contract vertically, when the height of the adjustable chair seat decreases, the backrest is in a shorter shape, and when it increases, the backrest is in a longer shape. The shape changes with height, and the installation of the S-shape makes the chair backrest more flexible during use and also ensures the visual overall appearance of the chair backrest. 2. The backrest frame has a space in the middle, firstly to ensure strength and reduce the weight of the backrest frame, and secondly to save material and reduce costs while ensuring overall strength. After the backrest frame is connected to the backrest, the shape of the backrest changes according to the S-shaped frame, ensuring overall stability after the user adjusts the height. Furthermore, the backrest changes according to the S-shaped frame, forming a curved projection. When leaning against the backrest, this curved projection acts as a back cushion, eliminating the need for the user to use a separate back cushion and avoiding the inconvenience of the back cushion falling off. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic diagram of the overall structure of the chair backrest of the height-adjustable chair in the embodiment of the present invention. [Figure 2] This is a schematic diagram of the side structure of the chair back of a height-adjustable chair. [Figure 3] This is a schematic diagram showing the structure of the chair backrest. [Modes for carrying out the invention]

[0017] The present application will be explained in more detail below, with reference to Figures 1-3.

[0018] This application discloses a chair backrest for a height-adjustable chair. Referring to Figures 1 and 2, the chair backrest for a height-adjustable chair includes a height-adjustable chair seat 1 and a chair backrest body 2. The height-adjustable chair seat 1 includes a cushion frame 11, a cushion 12 mounted on the cushion frame 11, and a chair backrest connecting portion 13 provided on the cushion frame 11. The chair backrest connecting portion 13 includes a first mounting portion and a second mounting portion, and the first mounting portion and the second mounting portion are used to attach the chair backrest body 2. The chair backrest body 2 includes a backrest frame body 21, a backrest 22 partially connected to the backrest frame body 21, and an S-shaped frame 23 provided between the backrest frame body 21 and the backrest 22. An adjustment space 24 exists between the backrest frame body 21 and the backrest 22, and the S-shaped portion of the S-shaped frame 23 is located within the adjustment space 24.

[0019] The backrest connecting section 13 is L-shaped, with a first mounting section provided horizontally and a second mounting section provided vertically. The first mounting section is connected to the cushion frame 11, and an expandable cavity is provided at the bottom of the backrest frame body 21. By fitting the expandable cavity onto the second mounting section, the backrest frame body 21 can be adjusted to move vertically. The expandable cavity provides a curved space in the S-shaped frame 23 when adjusting the height of the backrest, extending the lifespan of the chair.

[0020] One end of the backrest frame body 21 close to the lifting chair seat 1 is attached to the first attachment part, and one end of the S-shaped frame body 23 close to the lifting chair seat 1 is attached to the second attachment part. When the height of the chair backrest body 2 increases, the shape of the S-shaped frame body 23 stretches, and when the height of the chair backrest body 2 decreases, the shape of the S-shaped frame body 23 is compressed. When the height of the chair backrest increases, the S-shape stretches and deforms in the height direction, and the elastic deformation of the S-shape is larger. Also, since the S-shape has a structure that can expand and contract in the vertical direction, when the chair backrest body 2 is lowered, it is in the short shape of the backrest, and when it is raised, it is in the long shape of the backrest, and the shape changes with the height. With the installation of the S-shape, the chair backrest becomes more flexible during use, and the visual integrity of the chair backrest is guaranteed.

[0021] The backrest frame body 21 is a frame with a space in the middle. Between the backrest frame body 21 and the S-shaped frame body 23, a cam 211 is provided. On the backrest frame body 21, a connecting lug for attaching the cam 211 is provided. At one end of the back plate 22 close to the lifting chair seat 1, an attaching lug is provided. In the attaching lug, a cam hole is opened. When the back plate 22 is attached to the backrest frame body 21, the cam 211 is located in the cam hole. The backrest frame body 21 has a space in the middle. One reason is that it can guarantee the strength and reduce the weight of the backrest frame body 21. The other reason is that when guaranteeing the overall strength, it can save materials and reduce costs. After the backrest frame body 21 is connected to the back plate 22, the shape of the back plate 22 changes along with the S-shaped frame body 23. After the user adjusts the height, not only the integrity is guaranteed, but also the back plate 22 changes along with the S-shaped frame body 23, forming a protrusion with a radian. When leaning on the backrest, the protrusion with the radian at this part serves as a backrest cushion, so that the user does not need to use a backrest cushion and avoids troubles such as the falling of the backrest cushion.

[0022] In a selectable 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 lift chair seat 1. 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 backrest 22 is flush with the first curved portion 231. The lower half of the backrest 22 is flush with the first curved portion 231, and an arc-shaped formation protruding along the first curved portion 231 is formed, ensuring the overall visual effect and contributing to improved comfort. When in use, it supports the user's back. When adjusting the height of the chair backrest, the position and radian of the first curved portion 231 also change, and during the lifting process, it can meet the needs of different body heights.

[0023] In a selectable embodiment, a texture 224 is uniformly provided on the backrest 22. Due to the texture 224, the comfort of the backrest 22 is guaranteed after bending. The upper part of the backrest 22 is the first backrest 221, and the lower part of the backrest 22 is the second backrest 222. The thickness of the first backrest 221 is smaller than the thickness of the second backrest 222. The texture 224 provided on the backrest 22 is of a special shape. The texture 224 reduces the discomfort after the backrest 22 bends and improves the comfort of the waist and back. Since the thickness of the first backrest 221 is smaller than the thickness of the second backrest 222, the first backrest 221 can stick to and wrap the back, becoming more comfortable, and the second backrest 222 can support the waist, meeting ergonomics.

[0024] The first curved portion 231 has a radian. On one side of the second curved portion 232 close to the lift chair seat 1, a plurality of buffer grooves 233 are uniformly opened. The radian of the first curved portion 231 mainly serves a supporting role. The installation of the buffer grooves 233 is mainly used to increase the adjustment space 24 and enable the second curved portion 232 to achieve a better curvature while reducing stress. In a preferred embodiment, the buffer groove 233 is L-shaped. The groove of a special shape increases the deformation amount of the second curved portion 232.

[0025] A plate lug is provided at the lower end of the S-shaped frame 23, and a connecting hole 234 is provided in the plate lug, and the S-shaped frame 23 is rotatably connected to the first mounting part via the connecting hole 234. Preferably, the S-shaped frame 23 is rotatably connected to the rear end of the cushion frame 11 via the connecting hole 234. The lower end of the S-shaped frame 23 is rotatably connected to the rear end of the cushion frame 11 or the chair backrest connecting part 13. In this way, the S-shaped frame 23 can be more adapted to the extension deformation of the S-shaped frame 23, the adjustment of the chair backrest can be made easier, the requirement for a large amount of deformation can be met, and the diameter of the second curved part 232 of the S-shaped frame 23 can be set to be smaller, the space it occupies is smaller and it is more aesthetically pleasing.

[0026] In one selectable embodiment, the S-shaped frame 23 is required to be made of ultra-strong nylon material. In one selectable embodiment, the entire outer surface of the S-shaped frame 23 is covered with fabric, and in appearance, when adjusting the height, the chair backrest transitions smoothly, eliminating the visual discontinuity problem in conventional designs, resulting in a more aesthetically pleasing appearance, and making it less likely for a back cushion separately placed by the user to become attached between the chair backrest and the cushion 12.

[0027] A height positioning structure is provided between the backrest frame body 21 and the chair backrest connecting part 13, which can lock the height position of the chair backrest. This prevents the chair backrest from becoming difficult to use due to a change in height after adjustment, which can occur if the chair backrest is not positioned correctly. The height positioning structure includes a rack, a first direction changing structure and a second direction changing structure. The rack is provided on the chair backrest connecting part 13, the first direction changing structure is provided on the upper end of the rack, and the second direction changing structure is provided on the lower end of the rack. The backrest frame body 21 is provided with elastic locking teeth, which engage with the rack to lock it in place.

[0028] The user pulls the backrest frame body 21 upward, allowing the elastic locking teeth to move upward along the rack. When the upward movement is stopped, the elastic locking teeth engage with the rack by the action of a spring, locking in place. When the elastic locking teeth align with the upper end of the rack, they come into contact with the first direction-changing structure, thereby maintaining a retracted state. At this time, the backrest frame body 21 can move smoothly downward. When it moves down to the lower end of the rack, the elastic locking teeth come into contact with the second direction-changing structure, causing the elastic locking teeth to spring out from their retracted state, thereby engaging with the rack and locking. When the chair backrest body 2 is pulled out to its highest point and lowered, the elastic locking teeth are in a contracted state, causing the chair backrest body 2 to fall directly. The presence of the S-shaped frame 23 cushions this direct falling motion, thereby preventing the impact noise and, consequently, the injury caused by the chair backrest body 2 falling directly.

[0029] The implementation principle of the embodiment of this invention is as follows: When the height of the chair backrest increases, the S-shape expands and deforms in the height direction, and the elastic deformation of the S-shape is greater. Also, because the S-shape is a structure that can expand and contract vertically, when the chair backrest body 2 is lower, it is in the shape of a short backrest, and when it is higher, it is in the shape of a long backrest. The shape changes with height, and by installing the S-shape, the chair backrest becomes more flexible when in use, and the visual overall appearance of the chair backrest is guaranteed. The backrest frame body 21 has a space in the middle, which guarantees strength and the weight of the backrest frame body 21. This is because it can reduce the burden, and secondly, it can save materials and reduce costs while ensuring overall strength. After the backrest frame is connected to the back plate 22, the shape of the back plate 22 changes in accordance with the S-shaped frame 23. After the user adjusts the height, not only is the overall structure ensured, but the back plate 22 also changes in accordance with the S-shaped frame 23, forming a curved projection. When leaning against the backrest, this curved projection acts as a back cushion, so the user does not need to use a separate back cushion and avoids the inconvenience of the back cushion falling off.

[0030] All of the above are preferred embodiments of the present application and do not limit the scope of protection of the present application. Therefore, equivalent modifications based on the structure, shape, and principle of the present application should all be included within the scope of protection of the present application. [Explanation of Symbols]

[0031] 1... Height-adjustable chair seat, 11... Cushion frame, 12... Cushion, 13... Chair backrest connecting part, 2... Chair backrest body, 21... Backrest frame body, 211... Cam, 22... Back plate, 221... First back plate, 222... Second back plate, 223... Cam hole, 224... Texture, 23... S-shaped frame, 231... First curved part, 232... Second curved part, 233... Cushioning groove, 234... Connecting hole, 24... Adjustment space.

Claims

1. It is the backrest of a chair for a height-adjustable chair. The chair seat (1) includes a cushion frame (11), a cushion (12) mounted on the cushion frame (11), and a chair backrest connecting portion (13) provided on the cushion frame (11), wherein the chair backrest connecting portion (13) includes a first mounting portion and a second mounting portion, and the first mounting portion and the second mounting portion are used to attach other members. The chair backrest body (2) includes a backrest frame body (21), a back plate (22) partially connected to the backrest frame body (21), and an S-shaped frame (23) provided between the backrest frame body (21) and the back plate (22), wherein an adjustment space (24) exists between the backrest frame body (21) and the back plate (22), and the S-shaped portion of the S-shaped frame (23) is located within the adjustment space (24), Hereinafter, the chair back of a chair with height adjustment is characterized in that one end of the backrest frame body (21) closest to the chair seat (1) is attached to a first attachment part, and one end of the S-shaped frame body (23) closest to the chair seat (1) is attached to a second attachment part, and when the height of the chair backrest body (2) increases, the shape of the S-shaped frame body (23) expands, and when the height of the chair backrest body (2) decreases, the shape of the S-shaped frame body (23) is compressed.

2. The backrest frame body (21) is a frame having a space in the middle, a cam (211) is provided between the backrest frame body (21) and the S-shaped frame body (23), and the backrest frame body (21) is provided with a connecting lug for attaching the cam (211). The chair back of a lifting chair according to claim 1, characterized in that a mounting lug is provided at one end of the back plate (22) closest to the lifting chair seat (1), a cam hole is provided in the mounting lug, and when the back plate (22) is attached to the backrest frame body (21), the cam (211) is located within the cam hole.

3. The chair back of a lifting chair according to claim 2, characterized in that 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 (1), the first curved portion (231) is connected to the second curved portion (232), the first curved portion (231) is located above the second curved portion (232), the first curved portion (231) and the second curved portion (232) are separated in their curvature directions, and the lower half of the back plate (22) is flush with the first curved portion (231).

4. The chair back of a height-adjustable chair according to claim 3, characterized in that the backrest (22) is uniformly provided with a texture (224), the texture (224) ensures comfort after the backrest (22) is bent, the upper part of the backrest (22) is a first backrest (221), the lower part of the backrest (22) is a second backrest (222), and the thickness of the first backrest (221) is less than the thickness of the second backrest (222).

5. The chair back of a lifting chair according to claim 3, characterized in that the first curved portion (231) has an arc, and a plurality of cushioning grooves (233) are uniformly provided on one surface of the second curved portion (232) closest to the lifting chair seat (1).

6. The chair back of a lifting chair according to claim 5, characterized in that the buffer groove (233) is L-shaped.

7. The chair backrest connecting portion (13) is L-shaped, the first mounting portion is provided in the horizontal direction, the second mounting portion is provided in the vertical direction, and the first mounting portion is connected to the cushion frame (11). The chair back of a height-adjustable chair according to claim 6, characterized in that an expandable cavity is provided at the bottom of the backrest frame body (21), and the expandable cavity is fitted onto the second mounting portion so that the backrest frame body (21) can be adjusted to be pulled up and down.

8. The chair back of a height-adjustable chair according to claim 7, characterized in that a height positioning structure is provided between the backrest frame body (21) and the chair backrest connecting part (13), and the height positioning structure can lock the height position of the chair backrest.

9. The chair backrest for a lifting chair according to claim 7, characterized in that a plate lug is provided at the lower end of the S-shaped frame (23), a connecting hole (234) is provided in the plate lug, and the S-shaped frame (23) is rotatably connected to the first mounting part via the connecting hole (234).

10. The chair backrest of a lifting chair according to claim 9, characterized in that the S-shaped frame (23) is rotatably connected to the rear end of the cushion frame (11) via the connecting hole (234).

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