CN213216127U

CN213216127U - Seat and back of chair thereof

Info

Publication number: CN213216127U
Application number: CN202021025718.3U
Authority: CN
Inventors: 王江林; 刘磊; 王玄; 黄锡江
Original assignee: Henglin Home Furnishings Co Ltd
Current assignee: Henglin Home Furnishings Co Ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2021-05-18
Anticipated expiration: 2030-06-05

Abstract

The utility model relates to a thing to sit on field especially relates to a seat and back of the chair thereof. A chair back comprises a chair back main body and a waist support connected below the front end face of the chair back main body; the upper end swing joint that the waist leaned on in back of the chair main part, be connected with elastomeric element on the swing joint portion that the waist leaned on and/or the swing joint portion of back of the chair main part, elastomeric element acts on the waist leans on, and its potential energy can maintain the waist leans on relative back of the chair main part to be in the state of stretching forward. This back of the chair makes the waist lean on can hug closely user's waist through setting up elastomeric element, provides stronger top waist sense, realizes the function that the position of sitting was corrected.

Description

Seat and back of chair thereof

Technical Field

The utility model relates to a thing to sit on field especially relates to a seat and back of the chair thereof.

Background

The backrest of a common office chair is used for leaning of the back of a seat occupant, the aim is to reduce the force required by straightening of the back of the seat occupant, so that the seat occupant can obtain longer sitting and comfortable support, meanwhile, besides the backrest for leaning of the back of the seat occupant, a waist rest is additionally arranged below the backrest, the aim is to provide support of the waist of the seat occupant, and the overall comfort level during sitting is improved. However, the lumbar support arranged on the backrest is usually designed in a fixed manner, and a user can only actively attach to the lumbar support to experience the waist supporting effect, so that the user is forced to keep a seat with a specific sitting posture, and the sitting experience is poor. Moreover, different people have different human bodies or back curves, the fixed waist support cannot always provide a proper stable supporting point for different waist shapes, and further cannot provide a sitting posture correction function, and a comfortable self-adaptive effect is lacked.

Referring to a self-adaptive supporting device of a chair and the chair, which are disclosed in the Chinese patent publication with the publication number of CN110150891A, the self-adaptive supporting device comprises a chair back and a waist rest, a connecting fastener is arranged between the waist rest and the chair back, the connecting fastener comprises a male buckle with a ball head and a female buckle with a ball socket, the ball head is inserted into the ball socket to realize rotation in all directions, the male buckle is connected with the waist rest, and the female buckle is connected with the chair back; at least one group of elastic components is arranged between the waist rest and the chair back, the front end and the rear end of each elastic component are respectively connected with the waist rest and the chair back, and each group of elastic components comprises at least two springs. The scheme claims in the specification that the waist rest is more flexible and can be more fit with the curve of the waist of a human body. However, it has the following problems;

1, the waist support in the scheme is too flexible, so although the waist support can be fit with the waist curve of a human body, the waist support can provide a weak waist supporting feeling, and the function of sitting posture correction cannot be provided.

2, prop up the lumbar support through a plurality of springs in this scheme, the elasticity of spring is axial direction, and the whole lumbar support is articulated the setting. Therefore, when the waist rest is subjected to external force, the spring not only generates axial extrusion, but also generates deformation of other arbitrary angles, and the deformation of the spring is easily caused after long-term use.

3, the implementation of the technical scheme must ensure that the two axial ends of the spring are respectively propped against the waist rest and the chair back. Therefore, the arrangement mode of the spring in the scheme requires that the chair back is provided with a supporting part which is opposite to the waist and has supporting strength, thereby greatly limiting the applicable environment of the scheme.

Disclosure of Invention

In order to solve the above problem, a first object of the present invention is to provide a chair back, which can be used for pressing against the waist of a user by setting an elastic member, thereby providing a stronger feeling of pressing against the waist and realizing the function of sitting posture correction.

A second object of the present invention is to provide a seat having the above-mentioned back.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a chair back comprises a chair back main body and a waist support connected below the front end face of the chair back main body; the method is characterized in that: the upper end swing joint that the waist leaned on in back of the chair main part, be connected with elastomeric element on the swing joint portion that the waist leaned on and/or the swing joint portion of back of the chair main part, elastomeric element acts on the waist leans on, and its potential energy can maintain the waist leans on relative back of the chair main part to be in the state of stretching forward. The forward extending state of the lumbar support means that the lumbar support is in a forward position with respect to the seat back main body. The user is seated with the preferential contact against the lumbar support.

The above technical scheme is adopted in the utility model, this technical scheme relates to a back of the chair, and this back of the chair includes that the waist leans on, back of the chair main part and elastomeric element, and the upper end swing joint that the waist leaned on is in back of the chair main part, and elastomeric element sets up on the swing joint portion that the waist leaned on and/or the swing joint portion of back of the chair main part. The elastic component acts on the waist support to maintain the waist support in a forward extending state. When a user sits, the waist of the user exerts pressure on the waist support, and the waist support moves relative to the chair back main body along the movable connecting end of the waist support; at this time, the waist rest presses the elastic member to deform the elastic member, and the elastic force accumulated by the elastic member resists the external force. Under the interaction, the front end surface of the waist rest can be tightly attached to the waist of the user.

Compared with the technical scheme recorded in the Chinese patent publication with the publication number of CN110150891A, the scheme has the following two advantages:

1, the elastic component in the scheme mainly keeps the waist support in a forward extending state, but does not pursue the waist support to be more flexible; therefore, the elastic component in the scheme can be tightly attached to the waist of a user mainly for waist support, so that a strong waist supporting feeling is provided, and the function of sitting posture correction is realized.

Objectively, the waist rest and the chair back main body certainly have a connecting end which is a movable connecting end in the scheme. The elastic component in the scheme is arranged at the movable connecting part of the waist rest and/or the movable connecting part of the chair back main body, and the movable connecting part of the waist rest and the movable connecting part of the chair back main body are functional parts which are mainly used for realizing movable connection of the waist rest and the chair back main body. Therefore, compared with the scheme of the background technology, the scheme arranges the elastic component at the connecting position of the waist rest and the chair back main body; the chair back main body does not need to be provided with a large supporting part.

Preferably, the elastic component is an elastic rubber piece connected to the movable connecting part of the waist rest and/or the movable connecting part of the chair back main body, one end of the elastic rubber piece abuts against the waist rest, and the other end of the elastic rubber piece abuts against the chair back main body. In this technical scheme, inject the elastic component is elastic rubber spare, compares in other metal elastic component (like spring, torsional spring etc.), and elastic rubber spare has provides great elastic effect on the basis of less deformation volume to satisfy the requirement that provides stronger top waist feel more.

Preferably, the upper end of the waist support is hinged to the chair back main body through a rotating shaft, and the rotating shaft penetrates through the elastic rubber piece. On the basis of the adoption of the elastic rubber piece, the waist rest is hinged on the chair back main body by adopting a rotating shaft; so make the connection mode of waist support and back of the chair main part comparatively nimble, and the amount of exercise of waist support relative back of the chair main part is all implemented on elastic rubber spare to the stability and the reset force of waist support are provided by elastic rubber spare completely. Furthermore, the rotating shaft is limited to penetrate through the elastic rubber piece in the scheme, so that the elastic rubber piece is in a natural state, a weak extrusion state and a strong extrusion state, and the connection position of the waist rest and the chair back main body is fixed relative to the elastic rubber piece no matter how large the deformation quantity of the elastic rubber piece is, and the problem that the elastic direction provided for the waist rest is inconsistent due to the difference of the deformation quantity of the elastic rubber piece is solved.

Preferably, the chair back main body is provided with an installation groove, and at least one group of hinged seats is arranged in the installation groove; the rotating shaft is arranged on the hinge seat in a penetrating mode, and the elastic rubber piece is embedded and fixed in the mounting groove; the waist rest is abutted against the elastic rubber piece. The rotating shaft described in the above scheme is combined to penetrate through the elastic rubber piece. In this scheme, pass the pivot earlier the elastic rubber spare, then fix a position the pivot on articulated seat and make the elastic rubber spare inlay simultaneously and adorn in the mounting groove to accomplish the installation of elastic rubber spare. Therefore, the scheme not only limits the elastic rubber part to be installed on the chair back main body in a mode of being integrally embedded in the installation groove, but also limits the elastic rubber part through the rotating shaft and prevents the elastic rubber part from being separated from the installation groove.

Preferably, the hinged seat comprises a base part and a locking part which are arranged in the mounting groove, and the locking part is detachably connected or movably connected to the base part or the chair back main body around the base part; the locking part sets the rotating shaft on the hinging seat. In the technical scheme, the locking part can be detachably connected or movably connected to the base part or the peripheral chair back main body, namely, the locking part can be used for positioning the rotating shaft on the hinged seat in an unlocking mode, so that the assembly, disassembly and maintenance are facilitated.

Preferably, the outer surface of the elastic rubber part is provided with a convex part which is convex relative to the radial direction of the rotating shaft, and the waist rest is provided with a groove corresponding to the convex part; the convex part is embedded in the groove. The technical scheme has shown that the waist rest is hinged on the chair back main body by adopting the rotating shaft. On the basis, the convex part on the outer surface of the elastic rubber part is embedded in the groove of the waist rest, so that the waist rest can be subjected to the elasticity of the elastic rubber part along with the clockwise/anticlockwise rotation of the rotating shaft. Moreover, compared with the scheme of directly pressing the elastic rubber piece, the scheme also has the advantage that the convex part on the outer surface can provide larger deformation amount so as to avoid poor use experience caused by the smaller movement range of the waist rest. Meanwhile, the main body part of the elastic rubber piece ensures the elastic strength.

Preferably, the upper end of the waist support is hinged to the chair back main body through a rotating shaft, the elastic part is a torsion spring sleeved on the rotating shaft, and the deformation end of the torsion spring is abutted against the waist support. The scheme provides another implementation structure, and the waist rest can be tightly attached to the waist of a user through the rotating shaft and the torsion spring.

Preferably, the front end surface of the waist rest is provided with a supporting surface; the bearing surface is provided so as to be deformable based on the surface shape of the load and the applied pressure, thereby conforming to the load. According to the technical scheme, the waist rest can be tightly attached to the waist of the user; the front end surface of the waist support is set to be a deformable supporting surface which is used for fitting the waist of a user and adapting to the waist curves of different body types.

Preferably, the chair back main body comprises a main body frame and a backrest connected to the main body frame; the backrest is positioned above the waist rest and comprises a backrest frame and mesh cloth connected to the backrest frame and used for forming a supporting surface; the lumbar support comprises a lumbar support frame and a mesh connected to the lumbar support frame and used for forming a supporting surface.

A seat, characterized by: comprising a chair back as described above.

Drawings

Fig. 1 is a schematic view of a chair back structure in embodiment 1.

Fig. 2 is a sectional view of a chair back structure in embodiment 1.

Fig. 3 is an enlarged view of a portion a of fig. 2.

Fig. 4 is a partial exploded view of the chair back.

FIG. 5 is a perspective view partially in section of the chair back.

Fig. 6 is a schematic structural view of the elastic rubber member.

Fig. 7 is a schematic structural view of the lumbar support frame.

Fig. 8 is an enlarged view of a portion B of fig. 7.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

As shown in fig. 1 to 8, the present embodiment relates to a chair back, which includes a chair back main body 1 and a lumbar support 2 connected to a lower portion of a front end surface of the chair back main body 1. Waist leans on 2 upper end swing joint on back of the chair main part 1, and the waist leans on 2 swing joint portion and/or back of the chair main part 1 swing joint portion on be connected with elastomeric element, and elastomeric element acts on the waist leans on 2, and its potential energy can maintain the relative back of the chair main part 1 of waist leans on 2 is in the proud state. The forward extending state of the lumbar support 2 means that the lumbar support 2 is in a forward position with respect to the seatback main body 1. The user is seated with the preferential contact against the lumbar support 2.

Above-mentioned technical scheme relates to a back of chair, and this back of chair includes waist by 2, back of chair main part 1 and elastomeric element, and waist by 2's upper end swing joint in back of chair main part 1, elastomeric element sets up on waist by 2's swing joint portion and/or back of chair main part 1's swing joint portion. The elastic component acts on the lumbar support 2 to maintain the lumbar support 2 in a forward extending state. When the user sits, the waist of the user applies pressure to the lumbar support 2, and the lumbar support 2 moves relative to the seatback main body 1 along the movable connection end thereof. At this time, the lumbar support 2 presses the elastic member to deform the elastic member, and the elastic force accumulated by the elastic member opposes the external force. Under the mutual action, the front end surface of the waist support 2 can be tightly attached to the waist of the user.

the elastic component in the proposal mainly keeps the lumbar support 2 in a forward extending state, but does not pursue the lumbar support 2 to be more flexible. Therefore, the elastic part in the scheme can be tightly attached to the waist of a user mainly for the waist support 2, so that a stronger waist supporting feeling is provided, and the function of sitting posture correction is realized.

Objectively, the waist rest 2 and the chair back main body 1 certainly have a connecting end, in this case, a movable connecting end. The elastic component in the scheme is arranged at the movable connecting part of the waist support 2 and/or the movable connecting part of the chair back main body 1, and the movable connecting part of the waist support 2 and the movable connecting part of the chair back main body 1 refer to functional parts of the waist support 2 and the chair back main body 1 mainly for realizing movable connection of the waist support 2 and the chair back main body. Therefore, compared to the prior art, this embodiment provides the elastic member at the position where the lumbar support 2 is connected to the seatback main body 1. There is no need to provide a large support portion on the seatback main body 1.

Based on the basic requirements of the above scheme, the present embodiment provides two implementation modes as follows:

the first embodiment is that the upper end of the waist support 2 is hinged to the chair back main body 1 through a rotating shaft, the elastic part is a torsion spring arranged on the rotating shaft in a sleeved mode, and the deformation end of the torsion spring is abutted to the waist support 2. The waist rest 2 can be tightly attached to the waist of a user through the rotating shaft and the torsion spring; besides the two advantages described above, the waist rest 2 is hinged to the chair back body 1 by the rotating shaft in the same direction as the deformation direction of the torsion spring, and the torsion spring is not deformed.

The second embodiment is the key point of this embodiment, and specifically, the elastic component is an elastic rubber piece 3 connected to the movable connection portion of the lumbar support 2 and/or the movable connection portion of the chair back main body 1, one end of the elastic rubber piece 3 abuts against the lumbar support 2, and the other end abuts against the chair back main body 1. In this technical scheme, inject elastic component is elastic rubber spare 3, compares in other metal elastic component like spring, torsional spring etc. elastic rubber spare 3 has provides great elastic effect on the basis of less deformation volume to satisfy the requirement that provides stronger top waist feel more.

In a further scheme, the upper end of the waist rest 2 is hinged to the chair back main body 1 through a rotating shaft 4, and the rotating shaft 4 penetrates through the elastic rubber piece 3. On the basis of the elastic rubber piece 3, the waist rest 2 is hinged on the chair back main body 1 by a rotating shaft 4. Therefore, the connection mode of the lumbar support 2 and the chair back main body 1 is flexible, and the movement amount of the lumbar support 2 relative to the chair back main body 1 is implemented on the elastic rubber piece 3, so that the stability and the reset force of the lumbar support 2 are completely provided by the elastic rubber piece 3. Furthermore, in the scheme, the rotating shaft 4 is limited to penetrate through the elastic rubber part 3, so that the deformation of the elastic rubber part 3 is large no matter the elastic rubber part 3 is in a natural state, a weak extrusion state and a strong extrusion state, and the connecting position of the lumbar support 2 and the chair back main body 1 is certain relative to the elastic rubber part 3, so that the problem that the elastic force direction provided for the lumbar support 2 is inconsistent due to the difference of the deformation of the elastic rubber part 3 is avoided.

Be equipped with mounting groove 11 on the back of the chair main part 1, set up at least a set of articulated seat in the mounting groove 11. The hinged seat comprises a base part 51 and a locking part 52 which are arranged in the mounting groove 11, and the locking part 52 is detachably connected or movably connected to the base part 51 or the chair back main body 1 at the periphery of the base part. The locking portion 52 is used for positioning the rotating shaft 4 on the hinge seat. In the technical scheme, the locking part 52 is detachably or movably connected to the base part 51 or the chair back main body 1 around the base part, that is, the locking part 52 adopts an unlocking mode to position the rotating shaft 4 on the hinged seat, so that the disassembly and assembly or the maintenance are convenient; in the embodiment shown in the drawings, the lock portion 52 is connected to the seatback main body 1 by a screw member. The elastic rubber part 3 is embedded and fixed in the mounting groove 11, and the waist rest 2 is abutted against the elastic rubber part 3. The rotating shaft 4 described in connection with the above-mentioned embodiments passes through the elastic rubber member 3. In this scheme, pass pivot 4 earlier the elastic rubber spare 3, then with pivot 4 location on articulated seat and make elastic rubber spare 3 inlay the dress in mounting groove 11 simultaneously to accomplish the installation of elastic rubber spare 3. Therefore, this embodiment not only restricts the elastic rubber member 3 from being mounted on the seat back body 1 so as to be integrally fitted in the mounting groove 11, but also restricts the elastic rubber member 3 by the rotation shaft 4, and prevents the elastic rubber member 3 from being separated from the mounting groove 11. As shown in fig. 7 and 8, a connecting seat 23 is provided on the rear end surface of the lumbar support, and the rotating shaft 4 is inserted into the connecting seat 23.

As shown in fig. 3-6, the outer surface of the elastic rubber member 3 is provided with a protrusion 31 protruding radially relative to the rotating shaft 4, the lumbar support 2 is provided with a groove 21 corresponding to the protrusion 31, and the groove 21 is shown to be disposed on the connecting seat 23. The projection 31 is fitted into the recess 21. The above technical solutions have explained that the lumbar support 2 is hinged to the chair back main body 1 by the rotating shaft 4. On the basis, the convex part 31 on the outer surface of the elastic rubber part 3 is embedded in the groove 21 of the lumbar support 2, so that the lumbar support 2 can be subjected to the elastic force of the elastic rubber part 3 along with the rotation of the rotating shaft 4 in the clockwise/anticlockwise direction. Moreover, this solution has the advantage over the solution of directly pressing the elastic rubber member 3 that the convex portion 31 on the outer surface can provide a larger amount of deformation to avoid poor use experience caused by a smaller range of motion of the lumbar support 2. Meanwhile, the main body part of the elastic rubber member 3 ensures the elastic strength.

In addition, in either of the above embodiments, a feature may be incorporated to enhance the use experience of the lumbar support 2.

Specifically, a supporting surface is arranged on the front end surface of the waist rest 2. The bearing surface is provided so as to be deformable based on the surface shape of the load and the applied pressure, thereby conforming to the load. According to the technical scheme, the waist support 2 can be tightly attached to the waist of the user. The front end surface of the waist support 2 is set as a deformable supporting surface which is used for fitting the waist of a user and adapting to the waist curves of different body types. In a specific scheme, the chair back is a mesh chair back, and the chair back main body 1 comprises a main body frame 12 and a backrest connected to the main body frame 12. The backrest is positioned above the waist support 2 and comprises a backrest frame 13 and mesh cloth connected to the backrest frame 13 and used for forming a supporting surface. The lumbar support 2 includes a lumbar support frame 22 and a mesh attached to the lumbar support frame 22 for forming a support surface.

Example 2:

the present embodiment is not shown in the drawings, and relates to a chair comprising a chair back as described in embodiment 1.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims

1. A chair back comprises a chair back main body (1) and a waist rest (2) connected below the front end face of the chair back main body (1); the method is characterized in that: waist leans on the upper end swing joint of (2) on back of the chair main part (1), and the waist leans on the swing joint portion of (2) and/or is connected with elastomeric element on the swing joint portion of back of the chair main part (1), and elastomeric element acts on the waist leans on (2), and its potential energy can maintain the waist leans on (2) back of the chair main part (1) relatively and is in the state of stretching forward.

2. The chair back of claim 1, wherein: the elastic component is an elastic rubber piece (3) connected to the movable connecting portion of the waist support (2) and/or the movable connecting portion of the chair back main body (1), one end of the elastic rubber piece (3) is abutted against the waist support (2), and the other end of the elastic rubber piece is abutted against the chair back main body (1).

3. The chair back of claim 2, wherein: the upper end of the waist support (2) is hinged to the chair back main body (1) through a rotating shaft (4), and the rotating shaft (4) penetrates through the elastic rubber piece (3).

4. A chair back as claimed in claim 3, wherein: the chair back main body (1) is provided with a mounting groove (11), and at least one group of hinged seats is arranged in the mounting groove (11); the rotating shaft (4) is positioned on the hinge seat in a penetrating way, and the elastic rubber piece (3) is embedded and fixed in the mounting groove (11); the waist rest (2) is abutted against the elastic rubber piece (3).

5. The chair back of claim 4, wherein: the hinged seat comprises a base part (51) and a locking part (52), wherein the base part (51) and the locking part (52) are arranged in the mounting groove (11), and the locking part (52) is detachably connected or movably connected to the base part (51) or the chair back main body (1) at the periphery of the base part; the rotating shaft (4) is positioned on the hinge seat in a penetrating way by the locking part (52).

6. The chair back of claim 4, wherein: the outer surface of the elastic rubber piece (3) is provided with a convex part (31) which is convex relative to the radial direction of the rotating shaft (4), and the waist rest (2) is provided with a groove (21) which corresponds to the convex part (31); the protruding part (31) is embedded in the groove (21).

7. The chair back of claim 1, wherein: the upper end that the waist leaned on (2) articulates on back of the chair main part (1) through pivot (4), and elastomeric element establishes for the cover torsional spring on pivot (4), the deformation end of torsional spring supports and leans on (2) the waist.

8. A chair back according to any one of claims 1-7, wherein: the front end surface of the waist rest (2) is provided with a supporting surface; the bearing surface is provided so as to be deformable based on the surface shape of the load and the applied pressure, thereby conforming to the load.

9. The chair back of claim 8, wherein: the chair back main body (1) comprises a main body frame (12) and a backrest connected to the main body frame (12); the backrest is positioned above the waist rest (2) and comprises a backrest frame (13) and mesh cloth connected to the backrest frame (13) and used for forming a supporting surface; the lumbar support (2) comprises a lumbar support frame (22) and a mesh connected to the lumbar support frame (22) and used for forming a supporting surface.

10. A seat, characterized by: a chair back comprising any one of claims 1-9.