CN212213172U - Back of chair subassembly and office chair - Google Patents

Abstract

The utility model relates to a back of chair subassembly and office chair, back of chair subassembly includes: the back support is provided with a plurality of limiting grooves which are vertically arranged; and the backrest part, the backrest part with but back support sliding connection, be equipped with adjustment button on the backrest part, adjustment button includes locating part and elastic component, the elastic component be used for providing with the locating part with the locking force of back support locking, the locating part includes spacing portion and presses the splenium, spacing portion be used for with spacing groove joint cooperation, press the splenium to be used for overcoming under the exogenic action locking force is in order to drive spacing portion is followed the spacing inslot is deviate from. The utility model discloses a back of the chair subassembly can realize the lift adjustment of piece of backing, and easy operation is convenient, can satisfy different users' user demand well.

Description

Back of chair subassembly and office chair

Technical Field

The utility model relates to a chair technical field especially relates to a back of chair subassembly and office chair.

Background

The office chair is necessary for modern work and life, and the comfort of the office chair is directly related to the health of people. At present, the backrest parts of most office chairs on the market are arranged on the chair seat through the backrest support, and the backrest parts and the backrest support are designed in an integrated manner, so that the backrest parts cannot be adjusted in a lifting manner, and the use requirements of different users cannot be well met; some office chairs can be adjusted in a lifting manner, but the operation is quite inconvenient, so that the user experience is poor.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a chair back assembly and an office chair to solve the problem that the backrest of the conventional office chair cannot be conveniently adjusted in a lifting manner.

A seatback assembly, said seatback assembly comprising:

the back support is provided with a plurality of limiting grooves which are vertically arranged; and

backrest, backrest with but back of the body support sliding connection, be equipped with adjustment button on the backrest, adjustment button includes locating part and elastic component, the elastic component be used for providing with the locating part with the locking force of back of the body support locking, the locating part includes spacing portion and presses the splenium, spacing portion be used for with spacing groove joint cooperation, press the splenium to be used for overcoming under the exogenic action locking force is in order to drive spacing portion is followed the spacing inslot is deviate from.

The back of the chair subassembly can realize the lift adjustment of the back piece through the cooperation of the adjusting button on the back piece and the limiting groove on the back support, is simple and convenient to operate, and the user can adjust the back piece to a proper height according to the self demand when using, so as to ensure the use comfort and well meet the use demands of different users.

In one embodiment, the backrest comprises a first back frame and a second back frame, and the first back frame is detachably connected with the second back frame.

In one embodiment, the first back frame is connected with the second back frame in a snap-fit manner.

In one embodiment, the two opposite sides of the inner periphery of the first back frame are correspondingly provided with sliding connection grooves extending vertically, the bottom ends of the sliding connection grooves are arranged in an open manner, the two opposite sides of the back support are respectively provided with sliding connection parts, and the sliding connection parts are in sliding fit with the sliding connection grooves in a one-to-one correspondence manner; the back of the body support the relative both sides correspond and are equipped with along a plurality of vertical arranging the spacing groove, the relative both sides of first back of the body frame correspond and are equipped with adjustment button.

In one of them embodiment, the back of the chair subassembly still includes the waist and leans on the piece, the relative both sides that the waist leaned on the piece are equipped with the slick line respectively, slick line slidable is located first back of the body frame with the second back of the body frame encloses the slip space that closes the formation in, first back of the body frame is close to the one side of second back of the body frame still is equipped with the draw-in groove, still be equipped with the fixture block on the slick line, the fixture block with the draw-in groove joint, just the fixture block can follow under the exogenic action the draw-in groove slides, so that the waist leans on the piece can be relative lean on the piece and carry out.

In one of them embodiment, back of the chair subassembly still includes the headrest unit, the headrest unit includes mount pad, lifter and headrest body, mount pad detachably connect in the top of piece is backed to the back, the lifter with the mount pad is connected, just the lifter can be relative the mount pad is gone up and down and is adjusted, the headrest body rotationally connect in the lifter.

In one embodiment, the headrest main body comprises a first supporting plate and a second supporting plate, the first supporting plate and the second supporting plate are detachably connected, and a hinge portion for being hinged to the lifting rod is arranged on one surface, away from the second supporting plate, of the first supporting plate.

In one of them embodiment, back of the chair subassembly still includes the handrail unit, the handrail unit includes handrail support, handrail board and regulation structure, handrail support's bottom with back of the body leg joint, the handrail board passes through adjust structure movably install in handrail support's top, it can make to adjust the structure handrail board is relative handrail support carries out lift adjustment, it can also make to adjust the structure handrail board is relative handrail support carries out the regulation all around.

In one embodiment, the adjusting structure comprises an armrest sleeve, an armrest button and an adjusting plate, the armrest button is mounted in the armrest sleeve, the armrest sleeve is liftably sleeved on the top end of the armrest support through the armrest button, the adjusting plate is movably mounted at the top of the armrest sleeve, the adjusting plate can slide back and forth and left and right relative to the armrest sleeve, and the armrest plate is connected to the top of the adjusting plate.

An office chair comprises a chair seat and the chair back component, wherein the chair seat is connected with a back support of the chair back component.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural view of an office chair according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a chair back assembly according to an embodiment of the present invention;

FIG. 3 is a schematic view of the seatback assembly of FIG. 2 from another perspective;

FIG. 4 is a schematic structural view of a back bracket of the chair back assembly of FIG. 2;

FIG. 5 is an exploded view of the back member of the seat back assembly of FIG. 2;

FIG. 6 is an enlarged view of a portion of FIG. 5 at A;

FIG. 7 is a schematic illustration of a lumbar support of the chair back assembly of FIG. 2;

FIG. 8 is an exploded view of a headrest unit of the seat back assembly of FIG. 2;

fig. 9 is an exploded view of an armrest unit of the seatback assembly of fig. 2.

10. A seatback assembly; 11. a back support; 111. a sliding connection part; 112. a limiting groove; 12. a backrest member; 121. a first back frame; 1211. a sliding connection groove; 1212. a card slot; 122. a second back frame; 123. an adjustment button; 1231. a limiting member; 1232. an elastic member; 13. a lumbar support; 131. sliding the edge; 132. a clamping block; 14. a headrest unit; 141. a mounting seat; 142. a lifting rod; 143. a headrest body; 1431. a first support plate; 1432. a second support plate; 15. an armrest unit; 151. a handrail support; 152. a handrail plate; 153. a handrail sleeve; 154. an armrest button; 155. an adjusting plate; 156. a handrail surface; 20. a chair seat.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an office chair according to an embodiment of the present invention, which includes a chair seat 20 and a chair back assembly 10 connected to the chair seat 20. Wherein, seat support 20 mainly used supports human buttock and thigh, and seat support 20 includes the supporting leg and locates the pedestal at supporting leg top, and the pedestal can carry out lift adjustment relative to the supporting leg. Optionally, the bottom of the supporting leg is also provided with a caster assembly, so that the office chair can be flexibly moved. The chair back component 10 comprises a back support 11, a back rest piece 12, a waist rest piece 13, a headrest unit 14 and an armrest unit 15, wherein the back support 11 is used for integrally assembling the chair back component 10 to a chair seat 20, the back rest piece 12 can support the back of a human body, the waist rest piece 13 can support the waist of the human body, the headrest unit 14 can support the head of the human body, and the armrest unit 15 can support the elbow of the human body. The utility model discloses an each functional unit of office chair can carry out corresponding regulation according to user's user demand, accords with the ergonomic design, can effectively promote and use the travelling comfort to can satisfy different users' user demand.

Referring to fig. 2 and fig. 3, schematic structural diagrams of the chair back assembly 10 in two viewing angles according to an embodiment of the present invention are shown. The present invention provides a chair back assembly 10 comprising a back support 11 and a backrest 12. Referring to fig. 4 to 6, the back support 11 is provided with a plurality of limiting grooves 112 vertically arranged, the back support 12 is slidably connected to the back support 11, the back support 12 is provided with an adjusting button 123, the adjusting button 123 includes a limiting member 1231 and an elastic member 1232, the elastic member 1232 is used for providing a locking force for locking the limiting member 1231 and the back support 11, the limiting member 1231 includes a limiting portion and a pressing portion, the limiting portion is used for being in clamping fit with the limiting grooves 112, and the pressing portion is used for overcoming the locking force under an external force to drive the limiting portion to be disengaged from the limiting grooves 112.

The back support 11 is used to form a main supporting structure of the chair back assembly 10, and the back support 11 is further used to be connected and fixed with the chair seat 20. Optionally, the back support 11 is made of an aluminum alloy material, so that the structural strength can be effectively guaranteed, and meanwhile, the texture of the appearance can be highlighted. The backrest 12 is used to support the back of a person to relieve back fatigue. The adjustment button 123 on the backrest 12 is matched with the limiting groove 112 on the backrest support 11, so that the lifting adjustment of the backrest 12 can be conveniently realized, specifically, in an initial state, the limiting portion of the limiting member 1231 is clamped in one of the limiting grooves 112 of the backrest support 11, the elastic member 1232 applies elastic locking force to the limiting member 1231 to prevent the limiting portion from being separated from the limiting groove 112, and at this time, the backrest 12 is fixed at a first height position relative to the backrest support 11. When needing to adjust back of body 12 to second high position, the user only needs to exert certain pressing force to pressing the splenium, press the splenium and just can overcome the elasticity locking force of elastic component 1232, and then drive spacing portion and deviate from spacing inslot 112, at this moment, the user can follow vertically to slide back of body 12 to second high position, then loosen and press the splenium, elastic component 1232 resumes deformation and can make spacing portion joint again in the spacing inslot 112 that corresponds the position, so that back of body 12 keeps at second high position relative back of body support 11, easy operation is convenient.

The backrest component 10 can be matched with the limiting groove 112 on the backrest support 11 through the adjusting button 123 on the backrest 12, so that the lifting adjustment of the backrest 12 can be realized, the operation is simple and convenient, and a user can adjust the backrest 12 to a proper height according to own requirements when using the backrest, so that the use comfort is ensured, and the use requirements of different users can be well met.

Referring to fig. 5, in one embodiment, the backrest 12 includes a first back frame 121 and a second back frame 122, and the first back frame 121 is detachably connected to the second back frame 122. The first back frame 121 and the second back frame 122 can be connected into a whole by means of snap connection, screw connection, and the like. The first back frame 121 and the second back frame 122 are mutually spliced to form a skeleton structure of the backrest 12, wherein the second back frame 122 is arranged on one side close to the back of the human body, and the back fabric is fixed on the second back frame 122 so as to support the back of the human body. First back of the body frame 121 and second back of the body frame 122 can adopt the plastic part to make, have certain elasticity, can play certain shock attenuation cushioning effect to improve the travelling comfort.

Optionally, the first back frame 121 is connected with the second back frame 122 in a snap-fit manner. Specifically, a plurality of buckles may be disposed on one surface of the first back frame 121 close to the second back frame 122 along the circumferential direction, and a plurality of clamping grooves corresponding to the buckles in a one-to-one manner are disposed on the second back frame 122. Alternatively, the positions of the buckle and the clamping groove can be interchanged. Compare in the mode of fix with screw, the mode through the buckle connection is with first back of the body frame 121 and the amalgamation of second back of the body frame 122, and the operation is simpler, can effectively promote production efficiency, reduces the production error to improve production quality. In addition, the back fabric of the traditional office chair is usually fixed on the backrest 12 and cannot be replaced, and the selection of the back fabric has great limitation. Adopt the mode of buckle connection to carry out the amalgamation with first back of the body frame 121 and second back of the body frame 122, can make things convenient for the change of back surface fabric, can adopt genuine leather or screen cloth as back surface fabric according to the demand that the user is different. For example, when the back fabric needs to be replaced, the first back frame 121 and the second back frame 122 are detached, the original fabric is taken down, a new fabric is sleeved on the surface of the second back frame 122, the edge of the fabric is clamped between the first back frame 121 and the second back frame 122, the operation is simple and convenient, and the fabric is not easy to fall off after being clamped.

Further, please refer to fig. 4 and fig. 6, the two opposite sides of the inner periphery of the first back frame 121 are correspondingly provided with sliding connection slots 1211 extending along the vertical direction, the bottom ends of the sliding connection slots 1211 are provided with openings, the two opposite sides of the back support 11 are respectively provided with sliding connection portions 111, and the sliding connection portions 111 are in one-to-one sliding fit with the sliding connection slots 1211; the two opposite sides of the back support 11 are correspondingly provided with a plurality of limiting grooves 112 vertically arranged, and the two opposite sides of the first back frame 121 are correspondingly provided with adjusting buttons 123.

Specifically, as shown in fig. 4, the back support 11 includes two side support columns disposed opposite to each other and at an interval, a bottom end of each side support column extends toward one side of the second back frame 122 and approaches each other, and top ends of the two side support columns are connected by a cross beam. The side portion of each side support pillar is correspondingly provided with a sliding connection portion 111, the sliding connection portion 111 is a long strip extending along the vertical direction, and one surface of each side support pillar facing the second back frame 122 is respectively provided with a plurality of limiting grooves 112. During assembly, the opening of the sliding groove 1211 of the first back frame 121 is aligned with the sliding portion 111 of the back support 11, and then the sliding portion 111 is pushed into the sliding groove 1211, so that the operation is simple and convenient, the back support 11 and the backrest 12 can be rapidly assembled, and the assembly efficiency can be effectively improved. Meanwhile, the adjusting buttons 123 on the two sides of the first back frame 121 are respectively matched with the limiting grooves 112 on the two sides of the back support 11, so that the back support 12 can be conveniently lifted and adjusted, and the assembling stability between the back support 11 and the back support 12 can be ensured.

Further, referring to fig. 2 and 7, the seat back assembly 10 further includes a lumbar support 13, two opposite sides of the lumbar support 13 are respectively provided with a sliding edge 131, and the sliding edges 131 are slidably disposed in a sliding space defined by the first back frame 121 and the second back frame 122. As shown in fig. 6, a clamping groove 1212 is further disposed on one side of the first back frame 121 close to the second back frame 122, a clamping block 132 is further disposed on the sliding edge 131, the clamping block 132 is clamped with the clamping groove 1212, and the clamping block 132 can slide along the clamping groove 1212 under the action of an external force, so that the lumbar support 13 can be adjusted to lift relative to the backrest 12. The waist of the human body can be supported through the waist support piece 13, the fatigue of the waist is relieved, and the use comfort is further improved. During the assembly, with the fixture block 132 joint of lumbar support 13 in the draw-in groove 1212 of first back frame 121, again with second back frame 122 and first back frame 121 amalgamation, alright place the contained formation sliding space that closes of first back frame 121 and second back frame 122 in with the smooth limit 131 clamp of lumbar support 13 to realize the reliable assembly between lumbar support 13 and the back support 12, easy operation is convenient, can effectively promote assembly efficiency, reduces assembly error. Moreover, since the lumbar support 13 is light in weight, the lumbar support 13 can be kept at a fixed position by the friction force between the fixture block 132 and the side wall of the fixture groove 1212, when the position of the lumbar support 13 needs to be adjusted, a user only needs to apply a certain acting force to the lumbar support 13, and the friction force can be overcome, so that the lumbar support 13 can be slid to a proper position, the operation is simple and convenient, the lifting adjustment of the lumbar support 13 can be realized, and the use requirements of different users can be met.

Further, referring to fig. 2 and 3, the seat back assembly 10 further includes a headrest unit 14, the headrest unit 14 includes a mounting seat 141, a lifting rod 142 and a headrest body 143, the mounting seat 141 is detachably connected to the top of the seat back 12, the lifting rod 142 is connected to the mounting seat 141, the lifting rod 142 can be adjusted to lift relative to the mounting seat 141, and the headrest body 143 is rotatably connected to the lifting rod 142. The headrest unit 14 is detachably attached to the top of the backrest 12 by a mounting seat 141, and the head of the human body can be supported by the headrest unit 14. When the user uses the headrest unit 14, the user can select to install or not install the headrest unit according to the requirement of the user, so that the user has diversified selection spaces. In addition, the user can adjust the height of the headrest body 143 according to his or her needs, or can rotate the headrest body 143 to adjust it to a suitable angle for better fitting with the head.

Specifically, as shown in fig. 8, sliding connection between lifter 142 and mount pad 141, the one side of lifter 142 is equipped with along a plurality of screens of vertical arranging, mount pad 141 corresponds be equipped with screens complex joint portion, through along vertical push-and-pull lifter 142 until adjusting headrest main part 143 to suitable height after, joint portion and the screens joint cooperation that corresponds the position, alright keep headrest main part 143 at fixed position, easy operation is convenient. The top of the lifter bar 142 is bent toward the headrest body 143 and is connected to the headrest body 143 by a screw, so that the headrest body 143 can swing with respect to the lifter bar 142.

Further, the headrest body 143 includes a first support plate 1431 and a second support plate 1432, the first support plate 1431 is detachably connected to the second support plate 1432, and a hinge portion for hinging with the lifting rod 142 is provided on a surface of the first support plate 1431 away from the second support plate 1432. First backup pad 1431 and second backup pad 1432 splice each other and form main part bearing structure, this main part bearing structure is the saddle shape that the centre is low both sides height roughly to can laminate mutually with human head better. The first support plate 1431 is used for being hinged to the lifting rod 142, the second support plate 1432 is located on one side close to the head of a human body, and the headrest fabric is sleeved on the surface of the second support plate 1432. The first support plate 1431 and the second support plate 1432 may be detachably connected by a screw connection, a snap connection, or the like. Optionally, first backup pad 1431 adopts the buckle to be connected with second backup pad 1432, can effectively promote production efficiency, reduces the production error, can also make things convenient for the change of headrest surface fabric simultaneously.

Referring to fig. 2 and 9, in addition to the above embodiment, the chair back assembly 10 further includes an armrest unit 15, the armrest unit 15 includes an armrest support 151, an armrest plate 152 and an adjusting structure, a bottom end of the armrest support 151 is connected to the back support 11, the armrest plate 152 is movably mounted at a top end of the armrest support 151 through the adjusting structure, the adjusting structure can adjust the armrest plate 152 to move up and down relative to the armrest support 151, and the adjusting structure can also adjust the armrest plate 152 to move back and forth and left and right relative to the armrest support 151. So for handrail unit 15 has the 3D function, and the design is more humanized, and the user can carry out lift adjustment according to self demand, perhaps adjusts all around to promote the comfort level. Specifically, as shown in fig. 2, there are two sets of armrest units 15 respectively disposed on two opposite sides of the back support 11, each armrest unit 15 is directly connected to the back support 11 through an L-shaped armrest support 151, and the armrest support 151 and the back support 11 can be made of an aluminum alloy material, so that the structural strength can be improved, the continuity of the overall appearance structure can be enhanced, and the visual aesthetic feeling is enhanced.

Referring to fig. 9, in an embodiment, the adjusting structure includes a glove holding sleeve 153, a handrail button 154 and an adjusting plate 155, the handrail button 154 is installed in the glove holding sleeve 153, the glove holding sleeve 153 is liftably sleeved on the top end of the handrail support 151 through the handrail button 154, the adjusting plate 155 is movably installed on the top of the glove holding sleeve 153, the adjusting plate 155 can slide back and forth and left and right relative to the glove holding sleeve 153, and the handrail plate 152 is connected to the top of the adjusting plate 155. Specifically, the armrest button 154 includes a button portion, a support connected to one side of the button portion, and an adjusting lever connected to the bottom of the support, the support is movably connected to the inside of the armrest sleeve 153, the armrest sleeve 153 is further provided with an avoidance opening exposed by the button portion, the top end of the armrest support 151 is provided with a slot for the adjustment lever to be movably inserted, one of the side walls of the slot is provided with a plurality of bayonets arranged along the vertical interval, and the bottom end of the adjusting lever is provided with a hook matched with the bayonets in a clamping manner. The user only needs to press the button portion, and then drives the pothook of adjusting the pole bottom through the support and deviate from in the bayonet socket, then with handrail board 152 lift adjustment to suitable height after, the pothook is blocked in the bayonet socket that corresponds again, alright be fixed in corresponding position with handrail board 152, easy operation is convenient. The adjusting plate 155 can drive the handrail plate 152 to slide back and forth or left and right, thereby realizing the front, back, left and right adjustment of the handrail plate 152.

Optionally, the armrest unit 15 further includes an armrest surface 156 disposed on the outer surface of the armrest plate 152, the armrest surface 156 may be made of a flexible material, and when the elbow portion of the user is overlapped on the armrest surface 156, the armrest surface is comfortable.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

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", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. 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 application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A seat back assembly, comprising:

the back support is provided with a plurality of limiting grooves which are vertically arranged; and

backrest, backrest with but back of the body support sliding connection, be equipped with adjustment button on the backrest, adjustment button includes locating part and elastic component, the elastic component be used for providing with the locating part with the locking force of back of the body support locking, the locating part includes spacing portion and presses the splenium, spacing portion be used for with spacing groove joint cooperation, press the splenium to be used for overcoming under the exogenic action locking force is in order to drive spacing portion is followed the spacing inslot is deviate from.

2. The seatback assembly of claim 1, wherein the seatback member includes a first back frame and a second back frame, the first back frame being removably connected to the second back frame.

3. The seatback assembly of claim 2, wherein the first back frame is snap-fit to the second back frame.

4. The chair back assembly according to claim 2, wherein sliding grooves extending vertically are correspondingly formed in opposite sides of the inner periphery of the first back frame, the bottom ends of the sliding grooves are open, sliding portions are respectively formed in opposite sides of the back support, and the sliding portions are in one-to-one sliding fit with the sliding grooves; the back of the body support the relative both sides correspond and are equipped with along a plurality of vertical arranging the spacing groove, the relative both sides of first back of the body frame correspond and are equipped with adjustment button.

5. The chair back component of claim 2, further comprising a waist support, wherein sliding edges are respectively arranged on two opposite sides of the waist support, the sliding edges are slidably arranged in a sliding space defined by the first back frame and the second back frame, a clamping groove is further arranged on one surface of the first back frame close to the second back frame, a clamping block is further arranged on the sliding edges, the clamping block is clamped with the clamping groove, and the clamping block can slide along the clamping groove under the action of external force, so that the waist support can be adjusted to be lifted relative to the back support.

6. The chair back assembly of claim 1, further comprising a headrest unit, the headrest unit including a mounting seat, a lifting rod and a headrest body, the mounting seat being detachably connected to a top of the backrest member, the lifting rod being connected to the mounting seat, and the lifting rod being adjustable relative to the mounting seat, the headrest body being rotatably connected to the lifting rod.

7. The seatback assembly of claim 6, wherein the headrest body comprises a first support plate and a second support plate, the first support plate is detachably connected to the second support plate, and a hinge portion for hinging with the lifting rod is arranged on one surface of the first support plate away from the second support plate.

8. The chair back assembly according to any one of claims 1 to 7, wherein the chair back assembly further comprises an armrest unit, the armrest unit comprises an armrest support, an armrest plate and an adjusting structure, the bottom end of the armrest support is connected with the back support, the armrest plate is movably mounted on the top end of the armrest support through the adjusting structure, the adjusting structure enables the armrest plate to be relatively adjusted by lifting the armrest support, and the adjusting structure enables the armrest plate to be relatively adjusted by lifting the armrest support.

9. The chair back assembly of claim 8, wherein the adjustment structure comprises an armrest sleeve, an armrest button mounted in the armrest sleeve, and an adjustment plate movably mounted on the top of the armrest sleeve, the armrest sleeve being configured to be raised and lowered by the armrest button, the adjustment plate being configured to slide back and forth and side to side relative to the armrest sleeve, the armrest plate being connected to the top of the adjustment plate.

10. An office chair comprising a seat and a back assembly as claimed in any one of claims 1 to 9, the seat being connected to a back support of the back assembly.

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