Chair back facilitating loading and unloading of back cushions

Abstract

The application discloses a chair back facilitating the mounting and dismounting of a back cushion, which comprises a back cushion on the front side and a back plate on the rear side. The back plate has an overall arc structure with the middle part protruding forward, so that the back plate is divided into an upper inclined part inclined upward and rearward on the upper side and a lower inclined part inclined downward and rearward on the lower side in terms of inclination. The back cushion also has an arc structure with the middle part protruding forward, and the back cushion has a split structure, which comprises a back supporting part on the upper side and a waist supporting part on the lower side. The inclination of the back supporting part approaches that of the upper inclined part, and the inclination of the waist supporting part approaches that of the lower inclined part. The back supporting part and the waist supporting part are detachably connected to the back plate through a clamping hook structure, and the back supporting part is connected to the upper inclined part, and the waist supporting part is connected to the lower inclined part. The chair back facilitating the mounting and dismounting of the back cushion has the advantages that the back cushion is provided with a split structure, and two parts of the back cushion are detachably connected to parts corresponding to the inclination of the back plate, so that the mounting and dismounting operation between the back cushion and the back plate is stable and smooth.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to a chair back that facilitates the installation and removal of the backrest cushion. Background Technology

[0002] The chair back is a crucial component of seating furniture used to support the user's back. Currently, there is a type of recliner on the market with a relatively simple overall structure. The backrest consists of a back panel and a cushion. The back panel is a rigid, plate-like piece, while the cushion is made of soft, molded cotton material. The cushion is directly fixed to the front surface of the back panel, providing a comfortable support experience for the user. However, the back panel and cushion of this type of recliner are not removable after installation. The cushion cannot be washed or replaced when dirty. Furthermore, different users have different needs regarding the color, shape, and material of the cushion, and manufacturers need to design the entire chair back separately for different cushion models, resulting in high manufacturing costs.

[0003] To address the aforementioned problems, the inventors aim to provide a backrest for a lounge chair. This backrest comprises a front back cushion and a rear back panel. The back cushion includes a hard board and a soft padding laid on the front side of the hard board. The back cushion and back panel are detachably connected via a conventional hook-and-loop fastener structure. Specifically, a hook is provided on the rear side of the back cushion, and an L-shaped slot is formed in the back panel. When the back cushion is placed on the front side of the back panel, the hook engages from the wider side of the slot. Then, by sliding the back cushion to align with the back panel, the hook engages with the narrower side of the slot, thus sliding the back cushion onto the back panel. The reverse is also possible for detachment. Therefore, not only can the back cushion be cleaned or the soft padding replaced, but the installation and removal of the back cushion are also quite convenient.

[0004] However, in the spirit of striving for excellence, the inventors have discovered the following problems with the above solution: In order to make the shape of the chair back conform to the curved back of the human body, both the back pad and the back panel are arc-shaped structures with the center protruding forward. This makes it difficult for the back pad to slide up and down relative to the back panel when it is in contact with the front end of the back panel. That is, the hook cannot slide smoothly along the slot, resulting in a relatively unsmooth sliding assembly operation of the back pad. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a chair back that facilitates the installation and removal of the back cushion. By setting the back cushion as a split structure, the inclination of the back support part and the upper inclined part are similar, and the inclination of the lumbar support part and the lower inclined part are similar. The two parts of the back cushion are detachably connected to the corresponding parts of the back panel. The back support part can be slidably assembled along the front end face of the upper inclined part, and the lumbar support part can be slidably assembled along the front end face of the lower inclined part, thereby making the installation and removal operation between the back cushion and the back panel more stable and smooth.

[0006] The effect of this utility model is achieved as follows: This application provides a chair back that facilitates the attachment and removal of the backrest, including a front backrest and a rear back panel. The back panel has an arc-shaped structure that protrudes forward in the middle, so that the back panel is divided into an upwardly inclined part that slopes backward and upward on the upper side and a downwardly inclined part that slopes backward and downward on the lower side. The backrest also has an arc-shaped structure that protrudes forward in the middle, and the backrest is a split structure, including an upper back support part and a lower lumbar support part. The inclination of the back support part is close to that of the upwardly inclined part, and the inclination of the lumbar support part is close to that of the downwardly inclined part. The back support part and the lumbar support part are detachably connected to the back panel by a hook structure, and the back support part is connected to the upwardly inclined part, and the lumbar support part is connected to the downwardly inclined part.

[0007] Furthermore, the latch structure includes a latch and a latch groove. The latch is located in one of the back pad and the back panel, and the latch groove is located in the other. The latch groove extends vertically and includes a movable part and a locking part that are connected vertically. A latching plate is laterally provided on the side wall of the locking part. The latch enters or disengages from the latch groove through the movable part, and the latch can slide up and down along the latch groove. When the latch slides into the locking part, the latch and the latching plate engage, fixing the latch and the latching plate relative to each other in the front-back direction, thereby fixing the back pad and the back panel relative to each other in the front-back direction. This ensures that the loading and unloading operation between the back pad and the back panel is not only highly smooth but also very convenient.

[0008] Furthermore, multiple hooks are provided on the rear side of the back support and waist support, and multiple slots are correspondingly cut out on the back panel. The hard plate layer on the back pad can be molded into hooks in one piece using a mold, which is relatively convenient for processing and manufacturing. The back panel is also made of a rigid material, which makes it easy to cut out slots.

[0009] Furthermore, the movable part is located above the locking part. This allows the hook to smoothly engage with the locking part and be stably engaged with the locking plate, making the assembly of the back pad more stable and smooth.

[0010] Furthermore, the backrest features an overall arc-shaped structure that curves forward on both sides, and the back support and lumbar support also feature corresponding arc-shaped structures that curve forward on both sides. This allows the shape of the chair back to better wrap around and conform to the user's back, further enhancing the support experience and making the installation and removal of the back cushion smoother and more stable.

[0011] Furthermore, a magnetic positioning structure is provided between the back pad and the back panel. This structure includes a magnetic suction element and an adsorption part that magnetically attract each other. The magnetic suction element is located on one of the back pad and the back panel, while the adsorption part is located on the other. When the back pad is placed on the front side of the back panel, the magnetic suction element adheres to the adsorption part, causing the back pad to fit snugly against the back panel. This not only ensures high positioning accuracy but also further enhances the ease of back pad installation.

[0012] Furthermore, magnetic attachments are located on the rear side of the back support and lumbar support. The back panel is a plate-shaped piece of metal, with an adsorption section positioned on the back panel directly opposite the magnetic attachments. The metal back panel not only provides the chair back with high structural strength, but the magnetic attachments, located on the back cushion, allow for direct adsorption of the back panel during cushion installation, making the installation process more stable.

[0013] Furthermore, the rear sides of the back support and waist support have protruding columnar positioning parts, with recessed grooves on the positioning parts. Magnetic components engage with the positioning parts through these grooves. The front side of the back panel has recessed grooves extending vertically, which serve as suction points. The positioning parts and suction points engage and can slide relative to each other in the vertical direction. This not only further improves the positioning accuracy between the back pad and the back panel but also makes the loading and unloading of the back pad smoother.

[0014] Furthermore, a limiting structure is provided between the back pad and the back panel. This limiting structure includes a limiting protrusion and a limiting groove that engage with each other. The limiting protrusion is located in one of the back pad and the back panel, and the limiting groove is located in the other. When the limiting protrusion engages with the limiting groove, the back pad and the back panel are relatively fixed in the left-right direction. When the back pad is slidably assembled to the back panel via the hook structure, the limiting structure restricts the connection between the back pad and the back panel in the horizontal direction, further enhancing the connection strength and making the installation and removal of the back pad smoother and more stable.

[0015] Furthermore, both the back support and waist support are provided with limiting protrusions on their rear sides, and corresponding limiting grooves extending vertically are formed on the upper and lower inclined parts. The limiting protrusions can be formed in one piece with the hard plate layer on the back pad, making the processing operation relatively simple, and the limiting grooves are also easy to drill on the metal back plate.

[0016] The chair back provided in this application, which facilitates the installation and removal of the backrest cushion, features a split structure. The back support and upper tilt sections have similar inclinations, as do the lumbar support and lower tilt sections. The two parts of the backrest cushion are detachably connected to corresponding tilt sections on the back panel. The back support section can slide along the front face of the upper tilt section, and the lumbar support section can slide along the front face of the lower tilt section. This solves the problem of difficult assembly of the backrest cushion and back panel due to the curved structure of the back panel, making the installation and removal of the backrest cushion and back panel smoother and more stable. Furthermore, the entire backrest cushion is detachably connected to the back panel, allowing for individual removal for cleaning and replacement. The same back panel can accommodate backrest cushions of different materials and shapes; even the shapes and materials of the back support and lumbar support sections can differ. Users can freely choose and combine according to their needs, making it highly practical. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A three-dimensional structural diagram of the chair back provided in an embodiment of this application; Figure 2 This is a schematic diagram of the back structure of a chair back provided in an embodiment of this application; Figure 3 This is a schematic diagram of the connection structure between the back pad and the back plate provided in an embodiment of this application; Figure 4 This is a schematic diagram of the back structure of the back pad provided in an embodiment of this application; Figure 5 A schematic cross-sectional view of the chair back when the lumbar support is placed on the lower inclined part, as provided in an embodiment of this application. Figure 6 A schematic diagram of the cross-sectional structure of the chair back when the lumbar support is slid to the alignment with the lower inclined portion, as provided in an embodiment of this application; Figure 7 A schematic cross-sectional view of the chair back when the back support is placed on the upper inclined part, as provided in the embodiment of this application; Figure 8 This is a schematic cross-sectional view of the chair back when the back support portion slides to align with the upper inclined portion, as provided in the embodiment of this application.

[0018] The reference numerals in the attached drawings are as follows: 1-back pad, 1a-back support, 1b-waist support, 110-hook, 120-positioning part, 121-groove, 130-limiting protrusion, 2-back plate, 2a-upward tilting part, 2b-downward tilting part, 201-moving part, 202-locking part, 210-card plate, 220-adsorption part, 230-limiting groove, 3-magnetic suction element. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0020] Please refer to the attached document. Figure 1-8This application provides a chair back that facilitates the attachment and removal of the backrest, including a front backrest 1 and a rear back panel 2. The back panel 2 has an arc-shaped structure that protrudes forward in the middle, so that the back panel 2 is divided into an upper inclined part 2a that tilts backward and upward on the upper side and a lower inclined part 2b that tilts backward and downward on the lower side. The backrest 1 also has an arc-shaped structure that protrudes forward in the middle, and the backrest 1 is a split structure, including an upper back support part 1a and a lower lumbar support part 1b. The inclination of the back support part 1a is close to that of the upper inclined part 2a, and the inclination of the lumbar support part 1b is close to that of the lower inclined part 2b. The back support part 1a and the lumbar support part 1b are detachably connected to the back panel 2 by a hook structure, and the back support part 1a is connected to the upper inclined part 2a, and the lumbar support part 1b is connected to the lower inclined part 2b.

[0021] In this embodiment, by setting the back pad 1 as a split structure, the inclinations of the back support part 1a and the upper inclined part 2a are similar, and the inclinations of the waist support part 1b and the lower inclined part 2b are similar. The two parts of the back pad 1 are detachably connected to the corresponding inclination positions on the back plate 2. The back support part 1a can be slidably assembled along the front end face of the upper inclined part 2a, and the waist support part 1b can be slidably assembled along the front end face of the lower inclined part 2b. This solves the problem of difficult assembly of the back pad 1 and the back plate 2 due to the arc-shaped structure of the back plate 2, thus making the installation and disassembly operations between the back pad 1 and the back plate 2 more stable and smooth. Furthermore, the entire back pad 1 is detachably connected to the back plate 2, and the back pad 1 can be removed separately for cleaning and replacement. The same back plate 2 can accommodate back pads 1 of different materials and shapes. Even the shapes and materials of the back support part 1a and the waist support part 1b can be different. Users can freely choose and match according to their needs, making it highly practical.

[0022] Please refer to the attached document. Figure 2 and attached Figure 5-8 In some embodiments of this application, the hook structure includes a hook 110 and a slot. The hook 110 is disposed in one of the back pad 1 and the back plate 2, and the slot is opened in the other of the back pad 1 and the back plate 2. The slot extends vertically and includes a movable part 201 and a locking part 202 that are connected vertically. A locking plate 210 is provided laterally on the side wall of the locking part 202. The hook 110 passes through or leaves the slot from the movable part 201, and the hook 110 can slide up and down along the slot. When the hook 110 slides into the locking part 202, the hook 110 and the locking plate 210 engage and cooperate, so that the hook 110 and the locking plate 210 are relatively fixed in the front-back direction, thereby fixing the back pad 1 and the back plate 2 in the front-back direction.

[0023] In this embodiment, by setting a hook structure, the hook 110 guides the back support 1a to be assembled to the upper inclined part 2a and guides the waist support 1b to be assembled to the lower inclined part 2b in a sliding manner within the slot, ensuring precise positioning. Please refer to the attached diagram. Figure 5During installation, simply place the lumbar support 1b in front of the downward tilting part 2b, allowing the hook 110 to engage with the movable part 201. Please refer to the attached document. Figure 6 Then, slide the lumbar support 1b until it fully fits the lower inclined part 2b. The hook 110 slides into the locking part 202 and engages with the locking plate 210, thus positioning the lumbar support 1b on the lower inclined part 2b for further fixing. Conversely, the lumbar support 1b can be removed from the lower inclined part 2b. Similarly, please refer to the attached diagram. Figure 7-8 The back support 1a can also be attached to the upper inclined part 2a. As a result, the attachment and removal operation between the back pad 1 and the back plate 2 is not only highly smooth, but also very convenient.

[0024] Preferably, after the hook 110 is engaged with the locking part 202, the connecting hole on the back plate 2 is aligned with the threaded hole on the back pad 1. The screw is screwed into the connecting hole and threaded into the threaded hole, so that the back pad 1 can be completely fixed to the back plate 2. Conversely, the screw can be unscrewed to disassemble again. The installation and disassembly operation is simple and the connection strength is high.

[0025] Please refer to the attached document. Figure 2-4 In some embodiments of this application, multiple hooks 110 are provided on the rear side of the back support 1a and the waist support 1b, and multiple slots are correspondingly hollowed out on the back plate 2.

[0026] In this embodiment, the back pad 1 has a layered structure, including a soft padding layer on the front and a hard board layer on the back. The soft padding layer is made of molded cotton, but can also be made of materials such as mesh, leather, or velvet, providing a comfortable support experience for the user. The hard board layer on the back is an injection-molded plastic board, which is easy to process and manufacture and provides support for the soft padding layer. Therefore, by setting the hook 110 on the back pad 1, the hook 110 on the hard board layer on the back pad 1 can be formed in one piece using a mold, which is relatively convenient for processing and manufacturing. Moreover, the back plate 2 is also made of a rigid material, which makes it easy to cut out and form a slot.

[0027] Preferably, multiple hooks 110 are distributed along the edges of the back support portion 1a and the waist support portion 1b, and the hooks 110 on the left and right sides of the back support portion 1a and the waist support portion 1b are symmetrically arranged. The slots on the left and right sides of the back plate 2 are also symmetrically arranged, so that the hook heads of the left and right hooks 110 face opposite directions. After the hooks 110 are engaged with the locking portion 202, the back pad 1 and the back plate 2 are more tightly assembled in the left and right directions, and the connection strength is higher.

[0028] Please refer to the attached document. Figure 2 and attached Figure 5-8In some embodiments of this application, the movable part 201 is located above the locking part 202. Under the action of gravity, the back pad 1 has a tendency to slide downward relative to the back plate 2, so that the hook 110 can smoothly engage with the locking part 202 and stably engage with the plate 210, thereby making the assembly operation of the back pad 1 more stable and smooth.

[0029] Preferably, please refer to the appendix. Figure 5-8 When installing the back pad 1 onto the back panel 2, first install the lumbar support 1b onto the lower inclined part 2b, and then install the back support 1a onto the upper inclined part 2a, so that when the back support 1a is installed, there is enough gap between the back support 1a and the lumbar support 1b to allow the back support 1a to slide down to align with the upper inclined part 2a.

[0030] Please refer to the attached document. Figure 2-3 In some embodiments of this application, the back panel 2 has an overall arc-shaped structure that curves forward on both sides, and the back support 1a and lumbar support 1b also have corresponding arc-shaped structures that curve forward on both sides. This makes the entire chair back also have an arc-shaped structure that curves forward on both sides, so that the shape of the chair back can better wrap around and fit the user's back, further improving the support experience of the chair back. Furthermore, when the back support 1a and lumbar support 1b are assembled to the back panel 2, the curvature on both sides prevents the back support 1a and lumbar support 1b from moving left and right relative to the back panel 2, thus making the installation and removal of the back cushion 1 more stable and smooth.

[0031] Please refer to the attached document. Figure 2-4 In some embodiments of this application, a magnetic positioning structure is further provided between the back pad 1 and the back plate 2. The magnetic positioning structure includes a magnetic suction member 3 and an adsorption part 220 that magnetically attract each other. The magnetic suction member 3 is disposed in one of the back pad 1 and the back plate 2, and the adsorption part 220 is disposed in the other of the back pad 1 and the back plate 2. When the back pad 1 is placed on the front side of the back plate 2, the magnetic suction member 3 is adsorbed onto the adsorption part 220, so that the back pad 1 fits against the back plate 2. With the help of the magnetic attraction of the magnetic suction member 3 and the adsorption part 220, the back pad 1 can automatically fit against the back plate 2. The user does not need to manually fit the back pad 1 and the back plate 2 during assembly. The positioning accuracy is high. After adsorption, it is only necessary to further slide the back support part 1a to align with the upper inclined part 2a and slide the waist support part 1b to align with the lower inclined part 2b. Then the hook 110 can be engaged with the locking part 202 to complete the assembly operation of the back pad 1, thereby further improving the ease of installation of the back pad 1.

[0032] Please refer to the attached document. Figure 2-4In some embodiments of this application, the magnetic suction member 3 is disposed on the rear side of the back support part 1a and the lumbar support part 1b, and the back panel 2 is a plate-shaped piece made of metal. The part of the back panel 2 facing the magnetic suction member 3 is configured as an adsorption part 220. The back panel 2 is made of metal, which not only makes the overall backrest have high structural strength, but also allows the magnetic suction member 3 to be disposed on the back pad 1. When the back pad 1 is installed, the magnetic suction member 3 directly adsorbs the back panel 2, making the installation operation of the back pad 1 more stable.

[0033] Please refer to the attached document. Figure 3-4 In some embodiments of this application, columnar positioning portions 120 are formed on the rear side of the back support portion 1a and the waist support portion 1b. A groove 121 is formed in the positioning portion 120. The magnetic suction member 3 is snapped into the positioning portion 120 through the groove 121. A plurality of grooves extending in the vertical direction are formed in the front side of the back plate 2. The grooves are configured as adsorption portions 220. The positioning portion 120 and the adsorption portion 220 are snapped together and can slide relative to each other in the vertical direction.

[0034] In this embodiment, by setting the magnetic suction member 3 on the positioning part 120, and the adsorption part 220 having a groove-shaped structure that engages with the positioning part 120, during the assembly of the back support part 1a and the waist support part 1b, when the hook 110 engages from the movable part 201, the positioning part 120 engages with the adsorption part 220, and when the hook 110 slides into the locking part 202, the positioning part 120 moves downward along the adsorption part 220. That is, during the sliding assembly of the back pad 1, the positioning part 120 remains engaged with the adsorption part 220 and the magnetic suction member 3 remains adsorbed on the adsorption part 220, which not only further improves the positioning accuracy between the back pad 1 and the back plate 2, but also makes the loading and unloading operation of the back pad 1 more stable.

[0035] Please refer to the attached document. Figure 2-4 In some embodiments of this application, a limiting structure is further provided between the back pad 1 and the back plate 2. The limiting structure includes a limiting protrusion 130 and a limiting groove 230 that engage with each other. The limiting protrusion 130 is provided in one of the back pad 1 and the back plate 2, and the limiting groove 230 is provided in the other of the back pad 1 and the back plate 2. When the limiting protrusion 130 is engaged with the limiting groove 230, the back pad 1 and the back plate 2 are relatively fixed in the left-right direction. When the back pad 1 is slidably assembled to the back plate 2 through the hook structure, the limiting structure restricts the back pad 1 and the back plate 2 in the horizontal direction, further improving the connection strength between the back pad 1 and the back plate 2, making the loading and unloading operation of the back pad 1 more stable and smooth.

[0036] Please refer to the attached document. Figure 2-4In some embodiments of this application, limiting protrusions 130 are provided on the rear sides of both the back support portion 1a and the waist support portion 1b, and corresponding limiting grooves 230 extending in the vertical direction are hollowed out on the upper inclined portion 2a and the lower inclined portion 2b. The limiting protrusions 130 can be formed in one piece with the hard plate layer on the rear side of the back pad 1, which makes the processing operation relatively simple, and the limiting grooves 230 are also easy to drill on the metal back plate 2.

[0037] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means three or more.

[0038] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A chair back that facilitates the attachment and removal of the back cushion, characterized in that, The back panel includes a front back pad (1) and a rear back panel (2). The back panel (2) has an arc-shaped structure that protrudes forward in the middle, so that the back panel (2) is divided into an upper inclined part (2a) that tilts upward and backward and a lower inclined part (2b) that tilts downward and backward in the lower. The back pad (1) also has an arc-shaped structure that protrudes forward in the middle. The back pad (1) is a split structure, including an upper back support part (1a) and a lower waist support part (1b). The inclination of the back support part (1a) is close to that of the upper inclined part (2a), and the inclination of the waist support part (1b) is close to that of the lower inclined part (2b). The back support part (1a) and the waist support part (1b) are detachably connected to the back panel (2) by a hook structure. The back support part (1a) is connected to the upper inclined part (2a), and the waist support part (1b) is connected to the lower inclined part (2b).

2. The chair back with detachable backrest according to claim 1, characterized in that, The hook structure includes a hook (110) and a slot. The hook (110) is disposed in one of the back pad (1) and the back plate (2), and the slot is disposed in the other of the back pad (1) and the back plate (2). The slot extends vertically and includes a movable part (201) and a locking part (202) that are connected vertically. A locking plate (210) is provided horizontally on the side wall of the locking part (202). The hook (110) passes through the movable part (201) and disengages from the slot. The hook (110) can slide up and down along the slot. When the hook (110) slides into the locking part (202), the hook (110) and the locking plate (210) engage and cooperate, so that the hook (110) and the locking plate (210) are relatively fixed in the front-back direction, thereby making the back pad (1) and the back plate (2) relatively fixed in the front-back direction.

3. The chair back with detachable backrest according to claim 2, characterized in that, The back support (1a) and the waist support (1b) are provided with a plurality of hooks (110) on their rear sides, and the back plate (2) is hollowed out to form a plurality of slots.

4. The chair back with detachable backrest according to claim 2, characterized in that, The movable part (201) is located above the locking part (202).

5. The chair back with detachable backrest according to claim 1, characterized in that, The back plate (2) presents an arc-shaped structure that curves forward on both the left and right sides. The back support (1a) and the waist support (1b) also present arc-shaped structures that curve forward on both the left and right sides.

6. The chair back with detachable backrest according to claim 1, characterized in that, A magnetic positioning structure is also provided between the back pad (1) and the back plate (2). The magnetic positioning structure includes a magnetic suction element (3) and an adsorption part (220) that magnetically attract each other. The magnetic suction element (3) is provided in one of the back pad (1) and the back plate (2), and the adsorption part (220) is provided in the other of the back pad (1) and the back plate (2). When the back pad (1) is placed on the front side of the back plate (2), the magnetic suction element (3) is adsorbed onto the adsorption part (220), so that the back pad (1) fits against the back plate (2).

7. The chair back with detachable backrest according to claim 6, characterized in that, The magnetic suction member (3) is disposed on the rear side of the back support part (1a) and the waist support part (1b). The back plate (2) is a plate-shaped piece made of metal. The part of the back plate (2) facing the magnetic suction member (3) is configured as the suction part (220).

8. The chair back with detachable backrest according to claim 7, characterized in that, The back support (1a) and the waist support (1b) have columnar positioning parts (120) protruding from their rear sides. The positioning parts (120) have recessed grooves (121). The magnetic attractant (3) is engaged with the positioning parts (120) through the grooves (121). The front side of the back plate (2) has recessed grooves extending vertically. These grooves are configured as the adsorption parts (220). The positioning parts (120) and the adsorption parts (220) are engaged and can slide relative to each other in the vertical direction.

9. The chair back with detachable backrest according to claim 1, characterized in that, A limiting structure is also provided between the back pad (1) and the back plate (2). The limiting structure includes a limiting protrusion (130) and a limiting groove (230) that are engaged with each other. The limiting protrusion (130) is provided in one of the back pad (1) and the back plate (2), and the limiting groove (230) is provided in the other of the back pad (1) and the back plate (2). When the limiting protrusion (130) is engaged in the limiting groove (230), the back pad (1) and the back plate (2) are fixed relative to each other in the left and right directions.

10. The chair back with detachable backrest according to claim 9, characterized in that, The back support (1a) and the waist support (1b) are provided with the limiting protrusion (130) on their rear sides, and the upper inclined part (2a) and the lower inclined part (2b) are respectively hollowed out to form the limiting groove (230) extending in the vertical direction.

Images