Rib-clamping chair back and chair

Abstract

The utility model provides a rib clamping chair back and seat, including back support member, rib side support component symmetrically arranged on the left side and right side of back support member, through setting up the tooth linkage mechanism between the skeleton of two rib side support component, make the user manually pull one rib side support member and trigger the tooth linkage mechanism, the tooth linkage mechanism can trigger the tooth linkage mechanism. Therefore, the two rib side supporting pieces stay at the corresponding positions after being far away from each other or close to each other, effective supporting is formed for the ribs of a user, the adjusting mode is simple, operation is convenient, and the sitting posture adjusting device can be suitable for children or adults of different postures to sit; the rib clamping chair back is arranged on the seat, and the supporting force of the rib side supporting piece is not influenced by the gravity of a seated person, so that when users with different body forms sit on the seat, the users can adjust the supporting force of the rib side supporting piece on the rib side according to own requirements, and the use experience feeling of the seat is improved.

Description

Technical Field

[0001] The utility model relates to the field of seats, in particular to a ribbed chair back and a seat. Background Art

[0002] The existing seats on the market include seats for adults, such as office chairs, and seats for children, such as study chairs. Many of these seats are provided with side supports in order to correct the sitting posture of the user, thereby preventing the user from developing health problems such as scoliosis.

[0003] For example, in the seat patent with announcement number CN219613431, a laterally adjustable clamping arm is provided on the back frame of the seat, and the ends of the two clamping arms are respectively opened to form a clamping portion for clamping the body below the armpit and the ribs, and the clamping arm includes a fixing portion, on which are provided two laterally spaced fixing holes, and the back frame is provided with corresponding adjustment holes, so that the clamping arm can be matched with different fixing holes and adjustment holes by screws to adjust the distance between the two clamping arms, so that the seat can be suitable for adults of different body shapes or children in different developmental states to sit; however, the seat needs to repeatedly disassemble and assemble the screws when adjusting the distance between the clamping arms, and the adjustment process is relatively cumbersome.

[0004] For another example, in the chair patent with announcement number CN102726973, two supports are arranged on both sides of the chair surface, and a driving member and a connecting rod mechanism are connected between the two supports. When the user sits on the chair surface, the driving member and the connecting rod mechanism are triggered, and the two supports clamp the waist from both sides of the chair surface; the chair can convert the gravitational potential energy generated by the human body sitting on the chair surface into kinetic energy of the two supports to tighten the waist, so that adults or children of different body shapes can get support on both sides of their waist when sitting; but because the support force of clamping the waist side of the chair is mainly affected by the gravity of the sitter, the support force of the waist side is proportional to the body gravity of the sitter, that is, the greater the gravity of the sitter, the greater the support force of the waist side, which makes it difficult for sitter of different body shapes to adjust the support force of the waist side according to their own needs after sitting. This affects the sitting experience of the chair. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the purpose of the utility model is to provide a ribbed chair back. By arranging a tooth linkage mechanism between the skeletons of two rib side support components, the user can manually pull one of the rib side supports to trigger the tooth linkage structure, thereby making the two rib side supports move away from or approach each other and stay in corresponding positions, and effectively support the user's ribs. The adjustment method is simple and easy to operate, and it can be suitable for children or adults with different body shapes to sit.

[0006] A chair is further provided, in which the ribbed chair back is arranged on the chair, and the supporting force of the rib side support parts is not affected by the gravity of the seated person, so that when users of different body shapes sit down, the users can adjust the supporting force of the rib side support parts on the rib side according to their own needs, thereby improving the user experience of the chair.

[0007] The technical solution of the utility model is achieved in this way:

[0008] A ribbed chair back comprising

[0009] Back support; used to provide support for the back;

[0010] The rib side support assembly is symmetrically arranged on the left and right sides of the back support member, and the rib side support assembly includes a rib side support member and a frame connected to each other; the portion of the rib side support member that extends forward beyond the front end of the back support member has a support surface, the two support surfaces are opposite to each other, and a support area is formed between the two support surfaces; a tooth linkage structure is provided between the two frames, and the tooth linkage structure includes a rack on the frame that is located inside the rib side support member, the two racks are staggered left and right, and the teeth of the two racks are simultaneously meshed with linkage gears;

[0011] External force acts on one of the rib side supports and triggers the tooth linkage structure, so that the two rib side supports move closer to or farther from each other to adjust the size of the support area; and the two adjusted rib side supports can stay at the corresponding positions and remain in place.

[0012] Preferably, at least one end of the linkage gear is connected to a rotating shaft, and a rotating shaft hole corresponding to the position of the rotating shaft is provided on the back support member, and the rotating shaft is rotatably connected in the rotating shaft hole; the rotating shaft connected to the end of the linkage gear can provide rotational support for the linkage gear after cooperating with the rotating shaft hole, so that the linkage gear can be stably rotatably connected to the back support member.

[0013] Preferably, the support area has a maximum support space and a minimum support space; the two rib side support members are close to each other to a minimum width or away from each other to a maximum width, so that the support area switches between the minimum support space and the maximum support space; so that the chair back can be adapted to the needs of seated persons of different body shapes.

[0014] Preferably, the skeleton includes a main body and a rack connected to the inner end of the main body, the width of the main body is greater than the width of the rack, and a step surface is formed at the position where the main body and the rack are connected, wherein the step surface on one skeleton is opposite to the end of the rack on the other skeleton; when the two rib side supports are close to each other to the minimum width, the step surface on one skeleton is against the end of the rack on the other skeleton; so that the two skeletons are within a reasonable range when sliding left and right, avoiding the racks on the two skeletons from being misaligned during sliding and causing interference between the two rib side support components.

[0015] Preferably, it also includes a connecting member connected to each frame accordingly, and the back support member is provided with a slide groove extending left and right, and the connecting member is slidably connected in the slide groove; the connecting member is equivalent to a mounting carrier of the rib side support assembly, and the rib side support assembly can be moved in the left and right directions by sliding the connecting member in the slide groove.

[0016] Preferably, the slide groove includes limit ends on its left and right sides, and when the two rib side supports move away from each other to the maximum width, the limit ends abut against the connecting member, so that the two rib side supports will not fall out of the back support member when they are at the maximum width.

[0017] Preferably, the connecting member is a U-shaped plate with a U-shaped groove formed on the U-shaped plate, and a corresponding plug-in plate is provided on the frame, which is inserted into the U-shaped groove and connected to the U-shaped plate by screws; the U-shaped groove can provide a plug-in guide for the plug-in plate, and after the plug-in plate is inserted into the U-shaped groove, the screw connection also makes the connection effect of the plug-in plate and the connecting member more stable.

[0018] Preferably, a control and adjustment mechanism is provided between at least one of the left rib side support assembly and the right rib side support assembly and the back support member, and the control and adjustment mechanism is configured to lock and unlock the position of the corresponding rib side support assembly that moves left and right; so that the corresponding rib side support assembly can be slidably adjusted left and right, and the adjusted rib side support assembly can stay in the corresponding position.

[0019] Preferably, the control and adjustment mechanism includes a control rod connected to the rib side support assembly, and the back support is provided with a plurality of gear sockets arranged at intervals in the left and right directions and used to cooperate with the control rod. When the control rod is out of the corresponding gear socket, the corresponding rib side support can move left and right and adjust the size of the support area; when the control rod is inserted into the corresponding gear socket, the corresponding rib side support can stay in the corresponding position after adjustment; thereby simplifying the position locking and unlocking process of the rib side support assembly to a simple pulling process of the control rod, making the position adjustment and locking of the rib side support assembly simple and efficient.

[0020] Preferably, each frame is connected to a U-shaped plate; a U-shaped groove is formed on the U-shaped plate, and the U-shaped groove is surrounded by two spaced flat plates and a vertical plate connected between the two flat plates. The opposite end of the vertical plate has an opening open to the outside, and the frame is provided with a corresponding plug plate, which is inserted into the U-shaped groove from the opening and connected to the U-shaped plate by screws, and a distance is left between the plug plate and the vertical plate, thereby forming a guide groove connected to the outside world, and a control rod is inserted in the guide groove; the control rod uses the space between the plug plate and the vertical plate, so that the control rod can slide left and right with the corresponding rib side support assembly while realizing the position locking and unlocking of the corresponding rib side support assembly, with a simple design and ingenious structure.

[0021] Preferably, a side extension portion extending toward the inner side of the control rod is provided on the rod body of the control rod near the back support member, and the side extension portion is opposite to the rib side support member; when the control rod is disengaged from the corresponding gear position socket, the side extension portion abuts against the rib side support member, so that the control rod and the rib side support member form a hook limit, so as to prevent the control rod from falling off the rib side support assembly when the control rod is disengaged from the gear position socket.

[0022] Preferably, a back plate is connected to the front end of the back support member, which covers the front surface of the back support member and is provided with an avoidance groove for preventing the frame from moving left and right. The back plate blocks the front surface of the back support member while hiding the frame in appearance, and the avoidance groove can provide avoidance space for the frame to slide left and right. The design is ingenious and kills two birds with one stone.

[0023] Preferably, each skeleton is connected with a corresponding connecting piece, and the back support is provided with a slide groove extending left and right, and the connecting piece is slidably connected in the slide groove; when the back plate is connected to the front end of the back support, the rear end of the back plate is against the front end of the connecting piece; the back plate can also limit the connecting piece to prevent the connecting piece from slipping out of the slide groove forward.

[0024] Preferably, a soft pad is connected to the support surface of the rib side support member; the soft pad can provide a soft support touch for the rib side, thereby improving the sitting experience.

[0025] Preferably, the width between two rib side supports ranges from 240 mm to 380 mm.

[0026] A chair comprises the ribbed chair back.

[0027] The beneficial effects of the utility model using the above technical solution are:

[0028] 1. The ribbed chair back in the utility model can link the rib side support components on both sides of the chair back through the tooth linkage structure. The structure is simple and easy to operate. When the user adjusts the size of the support area to suit his own body shape, he only needs to pull one of the rib side support components, without repeatedly disassembling and assembling screws, which simplifies the adjustment process of the support space.

[0029] 2. The two rib side support components in the rib chair back change the size of the support space through the tooth linkage structure and can stay in the corresponding position. Therefore, the supporting force of the two rib side supports on the rib side is not affected by the sitting gravity. The occupant can adjust the supporting force of the rib side supports according to his own choice and needs, which improves the sitting experience of the chair.

[0030] 3. In the control and adjustment mechanism, the control rod and the multiple gear jacks cooperate to simplify the process of locking and unlocking the position of the rib side support assembly into the process of pulling and pulling the control rod, which has a simple structure, is easy to operate, and has a high adjustment effect.

[0031] 4. The front surface of the back support is connected to the backboard to form a double-layer structure, which can not only hide the frame inside the double-layer structure to optimize the appearance of the chair back, but also leave an avoidance groove on the backboard to prevent the frame from sliding, ensuring the normal sliding adjustment of the rib side support assembly. The design is ingenious and kills two birds with one stone. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of a ribbed chair back;

[0033] Figure 2 This is an enlarged view of the control rod;

[0034] Figure 3 This is an exploded view of the ribbed chair back;

[0035] Figure 4 This is an exploded view of the ribbed chair back from another angle;

[0036] Figure 5 is a schematic diagram of two rib side supports moving away from each other;

[0037] Figure 6 It is a schematic diagram of two rib side supports approaching each other;

[0038] Figure 7 A cross-sectional view showing the connection position of the control rod;

[0039] The figures are marked as follows: 1-back support, 2-rib side support, 3-linkage gear, 4-control rod, 5-back plate, 11-slide groove, 12-rotating shaft hole, 13-gear position jack, 22-cushion, 23-skeleton, 24-rack, 25-U-shaped plate, 31-rotating shaft, 51-avoidance groove, 111-limiting end, 231-plug plate, 232-step surface, 251-U-shaped groove, 252-guide groove, 253-vertical plate, 254-flat plate. DETAILED DESCRIPTION

[0040] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0042] The specific implementation methods of the utility model are as follows:

[0043] like Figure 1-7 As shown, this embodiment provides a ribbed chair back, comprising:

[0044] Back support member 1; used to provide support for the back, the back support member 1 is generally a plate-like structure;

[0045] The rib side support assembly is symmetrically arranged on the left and right sides of the back support member 1, and the rib side support assembly includes a rib side support member 2 and a frame 23 connected to each other; the rib side support member 2 is a plate-like structure, the front end of which protrudes forward and forms a parabolic arc to imitate the spinal curve of the human body; the part of the rib side support member 2 that extends forward beyond the front end of the back support member 1 has a support surface, the two support surfaces are opposite to each other, and a support area is formed between the two support surfaces; a tooth linkage structure is provided between the two frames 23, and the tooth linkage structure includes a rack 24 on the frame 23 located on the inner side of the rib side support member 2, the two racks 24 are staggered left and right, and the teeth of the two racks 24 are simultaneously meshed with a linkage gear 3;

[0046] When adjusting the size of the support area, an external force acts on one of the rib side supports 2 and triggers the tooth linkage structure, so that the two rib side supports 2 move closer to or farther away from each other to adjust the size of the support area. The external force usually refers to the pulling force of one of the rib side supports 2 by manpower; and the two rib side supports 2 after adjustment can stay in the corresponding position and remain in place.

[0047] Furthermore, in order to enable the linkage gear 3 to rotate stably, at least one end of the linkage gear 3 is connected to a rotating shaft 31, and a rotating shaft hole 12 corresponding to the position of the rotating shaft 31 is provided on the back support 1. In this embodiment, both ends of the linkage gear 31 are provided with rotating shafts 31, and the rotating shaft 31 is rotatably connected in the rotating shaft hole 12; the rotating shaft 31 connected to the end of the linkage gear 3 can provide rotation support for the linkage gear 3 after cooperating with the rotating shaft hole 12, so that the linkage gear 3 can be stably rotatably connected to the back support 1.

[0048] Furthermore, the support space of the support area formed when the two rib side supports 2 are adjusted has a maximum support space and a minimum support space; the two rib side supports 2 are close to each other to the minimum width or away from each other to the maximum width, so that the support area switches between the minimum support space and the maximum support space; so that the chair back can be adapted to the needs of seated persons of different body shapes; when the two rib side supports 2 are close to each other and the support area is in the minimum support space, the two rib side supports 2 cannot continue to be close to each other to avoid interference between the two rib side supports 2. Specifically, the frame 23 includes a main body and a portion connected to the inner end of the main body. The width of the main body is greater than that of the rack 24, and a step surface 232 is formed at the position where the main body and the rack 24 are connected, wherein the step surface 232 on one frame 23 is opposite to the end of the rack 24 on the other frame 23; when the two rib side support members 2 are close to each other to the minimum width, the step surface 232 on one frame 23 is against the end of the rack 24 on the other frame 23; so that the two frames 23 are within a reasonable range when sliding left and right, avoiding the racks 24 on the two frames 23 from being misaligned during sliding, which causes interference between the two rib side support components.

[0049] Furthermore, in order to enable the rib side support assembly to slide stably left and right on the back support 2, the ribbed chair back also includes a connecting member connected to each frame 23 accordingly, and the back support 1 is provided with a slide groove 11 extending left and right, and the connecting member is slidably connected in the slide groove 11; the connecting member is equivalent to the installation carrier of the rib side support assembly, and the connecting member is slidably connected in the slide groove 11, so that the rib side support assembly can move in the left and right direction.

[0050] Furthermore, when the two rib side supports 2 move away from each other and make the supporting area in the maximum supporting space, the two rib side supports 2 cannot continue to move away from each other to prevent the two rib side supports 2 from escaping from the slide groove 11. Specifically, the slide groove 11 includes limit ends 111 on its left and right sides. When the two rib side supports 2 move away from each other to the maximum width, the limit ends 111 abut against the connecting piece, so that the two rib side supports 2 will not fall out of the back support 1 when they are at the maximum width.

[0051] Furthermore, the skeleton 23 is connected to the connecting piece in the following manner: the connecting piece is a U-shaped plate 25, the volume of the U-shaped plate 25 is smaller than the volume of the skeleton 23, a U-shaped groove 251 is formed on the U-shaped plate 25, and a corresponding plug-in plate 231 is provided on the skeleton 23, the plug-in plate 231 is inserted into the U-shaped groove 251 and connected to the U-shaped plate 25 by screws; the U-shaped plate 25 occupies a small volume space and is not likely to affect the installation layout of other components; and the U-shaped groove 251 can provide a plug-in guide for the plug-in plate 231, and after the plug-in plate 231 is inserted into the U-shaped groove 251, the screw connection also makes the connection effect of the plug-in plate 231 and the connecting piece more stable.

[0052] Furthermore, a control and adjustment mechanism is provided between at least one of the left rib side support assembly and the right rib side support assembly and the back support member 1. In this embodiment, in order to ensure that the rib side support assemblies on both sides have sufficient locking force, control and adjustment mechanisms are provided between the rib side support assemblies on both sides and the back support member 1. The control and adjustment mechanisms are configured to lock and unlock the positions of the corresponding rib side support assemblies that move left and right; so that the corresponding rib side support assemblies can be slidably adjusted left and right, and the adjusted rib side support assemblies can stay in the corresponding positions; specifically, the control and adjustment mechanisms include The back support member 1 is provided with a control rod 4 connected to the assembly, and a plurality of gear sockets 13 which are arranged at intervals along the left-right direction and are used to cooperate with the control rod 4. When the control rod 4 is out of the corresponding gear socket 13, the corresponding rib side support member 2 can move left and right and adjust the size of the support area; when the control rod 4 is inserted into the corresponding gear socket 13, the corresponding rib side support member 2 can stay in the corresponding position after adjustment; thereby simplifying the position locking and unlocking process of the rib side support assembly to a simple pulling process of the control rod 4, making the position adjustment and locking of the rib side support assembly simple and efficient.

[0053] Furthermore, in order to be able to lock and unlock the position of the corresponding rib side support assembly, the control rod 4 needs to be connected to the rib side support assembly. Specifically, a U-shaped groove 251 is formed on the U-shaped plate 25, and the U-shaped groove 251 is surrounded by two spaced flat plates 254 and a vertical plate 253 connected between the two flat plates 254. The opposite end of the vertical plate 253 has an opening open to the outside, and the skeleton 23 has a corresponding plug plate 231. The plug plate 231 is inserted into the U-shaped groove 251 from the opening and is connected to the U-shaped plate 25 by screws, and a distance is left between the plug plate 231 and the vertical plate 253, thereby forming a guide groove 252 connected to the outside world, and the control rod 4 is inserted in the guide groove 252; the control rod 4 borrows the space between the plug plate 231 and the vertical plate 253, so that the control rod 4 can slide left and right with the corresponding rib side support assembly while realizing the position locking and unlocking of the corresponding rib side support assembly. The design is simple and the structure is ingenious.

[0054] Furthermore, although the control rod 4 will be separated when inserted into the guide groove 252 and matched with the gear socket 13, this inserted design makes it easy for the control rod 4 to slip out of the guide groove 252 when it is pulled by an external force and slip out of the gear socket 13, so that the control rod 4 is separated from the rib side support assembly. Therefore, in order to avoid this phenomenon, the control rod 4 has a side extension portion 41 extending toward the inner side of the control rod 4 at a position close to the back support 1 on the rod body, and the side extension portion 41 is opposite to the rib side support 2; when the control rod 4 slips out of the corresponding gear socket 13, the side extension portion 41 abuts against the rib side support 2, so that the control rod 4 and the rib side support 2 form a hook limit; to avoid the control rod 4 falling off from the rib side support assembly when the control rod 4 slips out of the gear socket 13.

[0055] Furthermore, the skeleton 23 and the slide groove 11 exposed on the back support 1 will affect the appearance of the chair back, so a back plate 5 is connected to the front end of the back support 1, the back plate 5 covers the front surface of the back support 1, and the back plate 5 is provided with an avoidance groove 51 for avoiding the left and right movement of the skeleton 23; the back plate 1 blocks the front surface of the back support 1 and forms a double-layer structure, which can hide the skeleton 23 in appearance, and the avoidance groove 51 can provide avoidance space for the left and right sliding of the skeleton 23. The design is ingenious and kills two birds with one stone.

[0056] Furthermore, the back plate 5 can also play a limiting role on the connecting piece. Specifically, each skeleton 23 is connected with a corresponding connecting piece, which is a U-shaped plate 25. The back support member 1 is provided with a slide groove 11 extending left and right, and the U-shaped plate 25 is slidably connected in the slide groove 11; when the back plate 5 is connected to the front end of the back support member 1, the rear end of the back plate 5 is against the front end of the U-shaped plate 25. At this time, the front and rear ends of the U-shaped plate 25 are respectively in contact with the back plate 1 and the bottom of the slide groove 11, so as to prevent the connecting piece from slipping out of the slide groove 11 forward.

[0057] Furthermore, a soft pad 22 is connected to the support surface of the rib side support member 2; the soft pad 22 can provide a soft support touch for the rib side, thereby improving the sitting experience.

[0058] Furthermore, in order to make the size of the support area within a reasonable range, the width between the two rib side supports 2 varies from 240mm to 380mm; this range allows children or adults with different body shapes to have their rib sides at both ends of their upper body effectively supported after sitting down.

[0059] A chair (not shown) is further provided, comprising the ribbed chair back; when a user sits on the chair, the size of the support area suitable for the user can be adjusted by pulling the rib side support members 2, so that the rib side support members 2 on both sides are always close to the rib side position, so as to play a role in waist clamping and correction.

[0060] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A ribbed chair back, characterized in that: include: Back support member (1); used to provide support for the back; A rib side support assembly is symmetrically arranged on the left and right sides of the back support member (1), and the rib side support assembly comprises a rib side support member (2) and a frame (23) connected to each other; the portion of the rib side support member (2) that extends forward beyond the front end of the back support member (1) comprises a support surface, the two support surfaces are opposite to each other, and a support area is formed between the two support surfaces; a tooth linkage structure is provided between the two frames (23), the tooth linkage structure comprises a rack (24) on the frame (23) and located inside the rib side support member (2), the two racks (24) are staggered left and right, and the teeth of the two racks (24) are simultaneously meshed with a linkage gear (3); An external force acts on one of the rib side support members (2) and triggers the tooth linkage structure, so that the two rib side support members (2) move closer to or farther from each other to adjust the size of the support area; and the two rib side support members (2) after adjustment can stay at corresponding positions and remain in place.

2. The ribbed chair back according to claim 1, characterized in that: At least one end of the linkage gear (3) is connected to a rotating shaft (31); a rotating shaft hole (12) corresponding to the position of the rotating shaft (31) is provided on the back support member (1); and the rotating shaft (31) is rotatably connected in the rotating shaft hole (12).

3. The ribbed chair back according to claim 1, characterized in that: The support area has a maximum support space and a minimum support space; The two rib side support members (2) are moved closer to each other to a minimum width or farther away from each other to a maximum width, so that the support area switches between a minimum support space and a maximum support space.

4. The ribbed chair back according to claim 3, characterized in that: The frame (23) comprises a body and a rack (24) connected to the inner end of the body, the width of the body is greater than the width of the rack (24), and a step surface (232) is formed at the position where the body and the rack (24) are connected, wherein the step surface (232) on one frame (23) is opposite to the end of the rack (24) on the other frame (23); when the two rib side support members (2) are close to each other to a minimum width, the step surface (232) on one frame (23) is against the end of the rack (24) on the other frame (23).

5. The ribbed chair back according to claim 3, characterized in that: It also includes a connecting piece connected to each frame (23) accordingly. The back support member (1) is provided with a slide groove (11) extending left and right. The connecting piece is slidably connected in the slide groove (11).

6. The ribbed chair back according to claim 5, characterized in that: The slide groove (11) comprises limiting ends (111) on its left and right sides, and when the two rib side support members (2) are moved away from each other to a maximum width, the limiting ends (111) abut against the connecting member.

7. The ribbed chair back according to claim 5, characterized in that: The connecting member is a U-shaped plate (25) having a U-shaped groove (251) formed thereon, and a corresponding plug plate (231) is provided on the frame (23). The plug plate (231) is inserted into the U-shaped groove (251) and connected to the U-shaped plate (25) by means of screws.

8. The ribbed chair back according to claim 1, characterized in that: A control and adjustment mechanism is provided between at least one of the left rib side support assembly and the right rib side support assembly and the back support member (1), and the control and adjustment mechanism is configured to lock and unlock the position of the corresponding rib side support assembly that moves left and right.

9. The ribbed chair back according to claim 8, characterized in that: The control and adjustment mechanism comprises a control rod (4) connected to the rib side support assembly, and a plurality of gear position sockets (13) are arranged at intervals in the left-right direction on the back support member (1) and are used to cooperate with the control rod (4). When the control rod (4) is out of the corresponding gear position socket (13), the corresponding rib side support member (2) can move left and right and adjust the size of the support area; when the control rod (4) is inserted into the corresponding gear position socket (13), the corresponding rib side support member (2) can stay in the corresponding position after adjustment.

10. The ribbed chair back according to claim 9, characterized in that: Each frame (23) is connected to a U-shaped plate (25) correspondingly; a U-shaped groove (251) is formed on the U-shaped plate (25), and the U-shaped groove (251) is surrounded by two spaced flat plates (254) and a vertical plate (253) connected between the two flat plates (254); the opposite end of the vertical plate (253) has an opening open to the outside; the frame (23) has a corresponding plug plate (231), and the plug plate (231) is inserted into the U-shaped groove (251) from the opening and connected to the U-shaped plate (25) by screws, and a distance is left between the plug plate (231) and the vertical plate (253), thereby forming a guide groove (252) connected to the outside, and the control pull rod (4) is inserted into the guide groove (252).

11. The ribbed chair back according to claim 9, characterized in that: A side extension portion (41) extending toward the inner side of the control rod (4) is provided on the rod body of the control rod (4) near the back support member (1), and the side extension portion (41) is opposite to the rib side support member (2); when the control rod (4) is disengaged from the corresponding gear position socket (13), the side extension portion (41) abuts against the rib side support member (2), so that the control rod (4) and the rib side support member (2) form a hooking limit.

12. The ribbed chair back according to claim 1, characterized in that: A back plate (5) is connected to the front end of the back support member (1), the back plate (5) covers the front surface of the back support member (1), and an avoidance groove (51) for avoiding left and right movement of the frame (23) is provided on the back plate (5).

13. The ribbed chair back according to claim 12, characterized in that: Each frame (23) is connected to a corresponding connecting piece, and a slide groove (11) extending leftward and rightward is provided on the back support (1), and the connecting piece is slidably connected in the slide groove (11); when the back plate (5) is connected to the front end of the back support (1), the rear end of the back plate (5) abuts against the front end of the connecting piece.

14. The ribbed chair back according to claim 1, characterized in that: A soft pad (22) is connected to the supporting surface of the rib side supporting member (2).

15. The ribbed chair back according to claim 1, characterized in that: The width between the two rib side supports (2) varies in the range of 240 mm to 380 mm.

16. A seat, characterized in that: The invention comprises the ribbed chair back as claimed in claim 1.

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