CN113854765A

CN113854765A - Chair back and chair

Info

Publication number: CN113854765A
Application number: CN202111168606.2A
Authority: CN
Inventors: 岳守江
Original assignee: Anji Yuejie Furniture Co ltd
Current assignee: Anji Yuejie Furniture Co ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2021-12-31
Anticipated expiration: 2041-10-08
Also published as: CN113854765B

Abstract

The invention discloses a chair back, which is internally provided with an accommodating cavity; the chair back is provided with a chair back step which extends left and right in a protruding manner from the back surface, and a window which penetrates through the accommodating cavity up and down is formed at the chair back step; the window is inserted with a writing table which is partially positioned in the accommodating cavity, is in a vertical state and is supported on the steps of the chair back; the writing table can move upwards for a certain distance and then gradually turn backwards until the writing table is in a horizontal state and is clamped between the front window edge and the rear window edge of the window. The invention has the advantages that the length of the writing desk can be prolonged, and the comfort level of a user is improved.

Description

Chair back and chair

Technical Field

The invention relates to a chair back and a chair, and belongs to the technical field of chairs.

Background

In accordance with the use requirements, a chair used in an auditorium, a classroom, a report hall, or the like is required to be provided with a tablet or a desk on which a document is placed and which is used for recording. For example, patent application with publication number CN210643339U discloses a rotatable writing board on an office chair, wherein when the writing board rotates along the central axis of a support rod to the horizontal position of the writing board, the body horizontally rotates around a connecting block to the right front of the chair, so that the problem that people are inconvenient to record or place objects when using the chair is solved. The writing board is arranged on the armrest of the chair, so that the writing board is low in height and relatively backward, and a user needs to frequently lower the head and even bend down to write, which is very uncomfortable.

In view of this technical problem, the prior art, as disclosed in patent application publication No. CN209315323U, discloses a seat back having a tablet, comprising: the writing board comprises a writing board body, wherein a support arm is pivotally connected to a first side of the writing board body, a first concave portion used for at least partially accommodating the support arm when the writing board body is folded is arranged at the joint of the writing board body and the support arm, the other end of the support arm is pivotally connected with a seat backrest, a writing board body accommodating portion used for accommodating the writing board body is arranged on the seat backrest, a second concave portion allowing the support arm to pass through and at least partially accommodating the support arm is arranged on one side of the writing board body accommodating portion, and the support arm is jointly accommodated by the first concave portion and the second concave portion. The writing board is arranged on the back of the chair back, so that the writing board is raised and leaned forwards compared with CN210643339U, and the writing comfort of a user is improved. However, the chair back and the writing board still have the following defects:

1. the height of the chair back cannot be too high, otherwise the vision of the users in the back row can be blocked, the height of the bottom end of the writing board cannot be too low, otherwise the height of the writing desk after being turned is too low, therefore, the height from the bottom end of the writing board to the top edge of the chair back is limited, namely, the length of the writing board is limited, therefore, the users need to tilt the body forwards when writing, the defect can be solved by reducing the gap between the front row and the back row of the chair, but the space of the legs of the users can be caused to be short.

2. When the user does not write, the writing desk is locked by mutually matching the first locking mechanism and the second locking mechanism after being erected and folded, the second locking mechanism is inserted into the first locking mechanism according to the attached drawing to lock the writing board, and if the user is not operated properly or is used for a long time, the locking failure writing board is easy to loosen, so that the situation that the locking failure writing board falls backwards is easy to occur, and potential safety hazards are easy to occur.

3. The writing desk, the support arm, the first locking mechanism, the second locking mechanism, the writing board fixing piece and the like are exposed on the back of the chair back, the appearance is not attractive enough, and the writing desk is not high-grade when being applied to places such as auditoriums.

Disclosure of Invention

The invention aims to provide a chair back and a chair, which can prolong the length of a writing desk and improve the comfort of a user.

The invention is realized by the following technical scheme.

A chair back is provided with an accommodating cavity inside; the chair back is provided with a chair back step which extends left and right in a protruding manner from the back surface, and a window which penetrates through the accommodating cavity up and down is formed at the chair back step; the window is inserted with a writing table which is partially positioned in the accommodating cavity, is in a vertical state and is supported on the steps of the chair back; the writing table can move upwards for a certain distance and then gradually turn backwards until the writing table is in a horizontal state and is clamped between the front window edge and the rear window edge of the window.

As a further improvement of the invention, the front window edge and the writing desk are respectively provided with a limiting structure and a matching structure, and the limiting structure and the matching structure can be abutted with each other to limit the maximum distance of upward movement of the writing desk and limit the writing desk from sliding backwards in the process of backward overturning of the writing desk.

As a further improvement of the invention, the back of the writing table has at least two support members; the writing table is turned backwards, and the supporting part is always supported on the rear window edge when the writing table is in a horizontal state.

As a further improvement of the present invention, the support member extends in the front-rear direction of the writing desk; the writing table is of a hollow structure, the front part of the supporting piece penetrates into the writing table and supports the front surface of the writing table, and the rear part of the supporting piece is positioned on the back surface of the writing table.

As a further improvement of the present invention, the support member is made of a rigid material; the chair back and the writing desk are made of plastic materials.

As a further improvement of the invention, the upper window edge and the lower window edge are fixedly connected with the reinforcing members made of rigid materials, so that the structural strength of the upper window edge and the lower window edge when the writing desk is clamped is increased.

As a further improvement of the invention, the back surface of the chair back is provided with a sliding area surface for the writing table to slide up and down on the chair back steps; when the writing table is in a vertical state, the supporting part is always supported on the wall of the accommodating cavity, so that the front surface of the writing table is always attached to the sliding area surface of the chair back.

As a further improvement of the invention, the left side and the right side of the step structure are respectively provided with a side wall structure which is formed by the back surface protrusion of the chair back and extends upwards, and the left side and the right side of the writing desk are respectively attached to the corresponding side wall structures.

As a further improvement of the invention, the side wall structure and the sliding area surface both extend upwards to the top edge of the chair back, so that the side wall structure, the step structure and the sliding area surface form an invagination notch on the back of the chair back; the writing table is in a vertical state and completely fills the sunken gap when being supported on the step structure.

A chair comprises the chair back, a chair seat and armrests.

The invention has the beneficial effects that:

1. on the premise of not influencing the writing height and the visual field of a user, the length of the writing table in a horizontal state after being turned backwards is prolonged, so that the user can write in a normal sitting posture, and the comfort level of the user is improved;

2. the writing table limits the maximum upward movement distance of the writing table and limits translation in the overturning process by the abutting and matching of the limiting mechanism and the matching structure, and the support component is used as an overturning fulcrum, so that the overturning stability of the writing table is improved;

3. the support component of the writing table also plays a role in supporting the front surface of the writing table so as to avoid the situation that a user sinks downwards when writing, and meanwhile, the writing table is attached to the sliding area surface when in a vertical state so as to avoid the phenomenon that the writing table shakes forwards and backwards;

4. when the writing desk is not suitable for use, the writing desk and the chair back are in an integral structure in appearance, so that the writing desk is more attractive, and the high-grade feeling is improved.

Drawings

The preferred embodiments of the present invention will hereinafter be described in detail to facilitate understanding of the objects and advantages of the invention, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of a chair back in an upright state of a writing desk in an embodiment 1;

FIG. 2 is a schematic structural view of a chair back in an embodiment 1, wherein the writing desk is horizontal;

FIG. 3 is a schematic structural view of the writing desk with the back removed in embodiment 1;

FIG. 4 is a schematic view of the writing desk of embodiment 1 from one viewing angle;

FIG. 5 is a schematic view of the writing desk of embodiment 1 from another viewing angle;

FIG. 6 is a schematic sectional view of the chair back in embodiment 1;

fig. 7 is a schematic structural diagram of a chair in embodiment 2.

Detailed Description

The invention is explained in more detail below with reference to the drawings and exemplary embodiments.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like as referred to or as may be referred to in this specification are defined with respect to the configuration shown in the drawings, and the terms "inner" and "outer" refer to directions toward and away from the geometric center of a particular component and are relative terms, and thus may be changed accordingly depending on the position and the state of use of the particular component. Therefore, these and other directional terms should not be construed as limiting terms.

Example 1:

referring to fig. 1 to 6, a chair back 1 is roughly in the shape of a square with long upper and lower sides and narrow left and right sides, a back surface of the chair back 1 is protruded to form a chair back step 1-a extending left and right sides, and the left and right sides of the chair back step 1-a extend to the left and right side edges of the chair back 1. The chair back step 1-A is used for supporting the writing table 2 which is horizontally unfolded backwards and is described later, so the chair back step 1-A is not too low and should approximately correspond to the height of the chest of a user in normal sitting posture, a more comfortable writing height can be provided for a user in a back row at the height, the writing table 2 can be always kept in the range of the residual light of the user under the conditions that the user is in normal sitting posture and looks straight ahead, and the user can not frequently lower the head and raise the head or the trunk of the user can be bent downwards to clearly see the written content during writing.

The chair back 1 is of a hollow structure, an accommodating cavity 10 is formed in the chair back, a window 11 which extends along the left-right direction and penetrates through the accommodating cavity 10 up and down is formed in the step 1-A of the chair back, and the height of a front window edge 111 of the window 11 is higher than that of a rear window edge 112. In one embodiment, the step surface of the chair back step 1-A is matched with the inclination degree of the window 11, so that the window 11 is completely positioned on the chair back step 1-A; in another embodiment, where the step surface of the seat back step 1-A is substantially horizontal, the front window edge 111 of the window 11 is located on the back surface of the seat back 1, thus allowing a small portion of the window 11 to be located on the back surface of the seat back 1.

The window 11 is inserted and is equipped with the writing platform 2 that is vertical state, and writing platform 2 part is located the holding chamber 10 in the back of the chair 1, and part exposes outside the back of the chair 1, and writing platform 2 can upwards move a distance back again and overturn gradually, is the horizontality and is blocked between the front window edge 111 of window 11, back window edge 112. In this embodiment, the top end of the writing desk 2 in the upright state and the rear end in the horizontal state are defined as the distal end of the writing desk 2, and the bottom end of the writing desk 2 in the upright state and the front end in the horizontal state are defined as the proximal end of the writing desk 2; the surface of the writing desk 2 used for writing is defined as the front surface of the writing desk 2, and the other surface is defined as the back surface of the writing desk 2. In addition, the upright state and the horizontal state of the writing desk 2 are not strictly upright and horizontal, and a small degree of angle adjustment is allowed, depending on the angle design of the chair back 1 and the maximum writing comfort of the user.

The back of the writing table 2 is provided with a supporting step 2-A extending to two side faces of the writing table 2 along the left-right direction, the supporting step 2-A is supported on the chair back step 1-A when the writing table 2 is in a vertical state, so that the part from the far end of the writing table 2 to the supporting step 2-A is positioned outside the chair back 1, the part from the near end of the writing table 2 to the supporting step 2-A is in the accommodating cavity 10, namely the part which can be extended of the writing table 2, and the writing table 2 presents a complete length after being turned to be in a horizontal state. For a user, the height of the chair back 1 is not too high, generally lower than the eye height of the user in a normal sitting posture, otherwise the view of the user is easily blocked, accordingly, when the writing desk 2 is supported on the chair back step 1-a, the far end of the writing desk is not higher than the top edge of the chair back 1, the height of the chair back step 1-a is not too low based on the writing comfort of the user, the height from the top edge of the chair back 1 to the chair back step 1-a is limited, the length of the part of the writing desk 2 outside the chair back 1 is limited, if the part is used as the actual length of the writing desk 2 after being turned to the horizontal state, the far end of the writing desk 2 is too far away from the user, the user needs to lean forward, the writing is inconvenient, the distance between the front chair and the back chair can be reduced, and the problem is solved, but can lead to spatial constraints on the user's legs. In this application, the extensible part of the writing desk 2 is placed in the accommodating cavity 10, and the writing desk 2 is moved upwards and then turned backwards, so that the actual length of the writing desk 2 in a horizontal state is finally extended, and a user can write without leaning forward. Of course, the ratio of the length of the extendable portion of the writing table 2 to the total length of the writing table 2 is set mainly with reference to the interval between the front and rear chairs. Therefore, in summary, the writing desk 2 and the chair back 1 are structurally arranged, so that the user can write under the conditions of normal sitting posture and head-up visual angle, and the comfort and experience of the user are optimized.

The writing table 2 is functionally divided into a front writing table part 2-1 and a rear writing table part 2-2, the front writing table part 2-1 is used for a user to write, and the rear writing table part 2-2 is clamped by a front window edge 111 and a rear window edge 112 when the writing table 2 is turned backwards to be in a horizontal state. The bottom of the front window edge 111 and the front surface of the writing desk rear part 2-2 are respectively provided with a limiting structure 1-B and a matching structure 2-B, and the limiting structure 1-B and the matching structure 2-B are abutted when the writing desk 2 moves upwards until the supporting part 3 is supported on the front window edge 111, so that the maximum distance of upward movement of the writing desk 2 is limited, and the writing desk 2 is limited to slide backwards in the backward overturning process of the writing desk 2. The structure limiting structure 1-B and the matching structure 2-B are respectively a structure with a convex surface and a concave surface, or a structure with a concave surface and a convex surface.

The back of the writing table rear part 2-2 is provided with two bilateral symmetry supporting components 3, when the writing table 2 moves upwards to the limiting structure 1-B, the matching structure 2-B is abutted against each other, and the writing table 2 gradually turns backwards to be in a horizontal state, the supporting components 3 are supported on the rear window edge 112 all the time, and the contact part of the supporting components 3 and the rear window edge 112 is used as a rotation fulcrum, so that the turning stability of the writing table 2 is improved.

The user writes platform 2 when writing and needs to have better support nature, take place with the condition that the front of avoiding writing platform 2 appears the pressurized undercut, consequently, the thickness of writing platform 2 should not be too thin, but if writing platform 2 sets up to the solid body structure who possesses certain thickness, its weight can be too big, upward movement and backward upset seem comparatively heavy, and the pressure that receives in addition to self weight can make writing platform 2 and front window along 111, the position atress load that rear window along 112 blocked is heavier, thereby appear structural deformation, the condition that reduces life such as easy ageing. The writing desk 2 is provided in a hollow structure for the purpose of improving the supporting performance and reducing the load, and the front part 2-1 of the writing desk has a larger thickness than the rear part 2-2 of the writing desk, and the support member 3 extends along the length of the writing desk 2 from the distal end of the writing desk 2 to the proximal end of the writing desk 2. The support part 3 is structurally in a flat plate-shaped structure and is divided into two parts, the front part of the support part 3 penetrates into the front part 2-1 of the writing desk and supports the front surface of the writing desk 2 so as to improve the rigidity of the front surface of the writing desk 2 and prevent downward depression under pressure; the rear portion of the desk 2 is located on the back of the desk rear portion 2-2 for supporting on the rear window rim 112 as a fulcrum for the turning.

Further, the writing desk 2 comprises a bottom box structure 21 and a top cover structure 22, wherein the top cover structure 22 is embedded on the bottom box structure 21 and is detachably and fixedly connected through a fastener; the front surface of the writing desk front part 2-1 is positioned on the top cover structure 22, the bottom surface of the writing desk front part 2-1 and the writing desk rear part 2-2 are positioned on the bottom box structure 21, the bottom surface of the bottom box structure 21 is provided with a plurality of boss bodies 211, and the supporting part 3 is supported between the top cover structure 22 and the boss bodies 211, so that the structure of the writing desk 2 is hollow, and a stable and reliable supporting function can be provided for the front surface of the writing desk 2.

When a user holds an arm on the writing desk 2 during writing, the front part 2-1 of the writing desk is pressed down, and the back part of the writing desk has a slight upward tilting tendency under the lever action of the supporting component 3, so that the interaction force between the back part 2-2 of the writing desk and the front window edge 111 is greater than the interaction force between the supporting component 3 and the back window edge 112, namely the front window edge 111 and the back part 2-2 of the writing desk are more easily damaged. Therefore, the front window edge 111 and the writing table rear portion 2-2 are made of plastic materials, certain deformation can be allowed to occur when the front window edge 111 and the writing table rear portion 2-2 interact with each other, the situation that the writing table 2 cannot rotate due to the fact that the limiting structure 1-B and the matching structure 2-B are locked can be avoided in the overturning process of the writing table 2, in addition, the chair back 1 and the writing table 2 are made of plastic materials in a derivation mode in consideration of production cost, and specifically, the plastic materials such as polypropylene and polyethylene can be selected. The support part 3 is required to have certain strength to play the role of supporting the stable pivot in the front surface and the overturning process of the writing table 2, so that a rigid material is used, and particularly, metal parts such as stainless steel can be selected.

In order to further strengthen the structural strength of the front window edge 111 and the rear window edge 112 and further enable the front window edge 111 and the rear window edge 112 to be clamped on the writing desk 2 more stably and reliably, the reinforcing members 4 made of rigid materials are fixedly connected to the front window edge 111 and the rear window edge 112 and can be made of stainless steel, the reinforcing members are long-strip plate-shaped sheets extending in the left-right direction, the long-strip plate-shaped sheets are attached to the surfaces of the front window edge 111 and the rear window edge 112 and are fixedly connected through fasteners, and the front surface and the rear surface of the front window edge 111 and the rear window edge 112 can be additionally installed according to specific conditions.

The back of the chair back 1 is provided with a sliding area surface 1-s for the writing table 2 to slide up and down on the chair back step 1-A, when the writing table 2 is in a vertical state, the rear end of the supporting part 3 is always supported on the cavity wall of the accommodating cavity 10, so that the front of the writing table 2 is always attached to the sliding area surface 1-s, namely, the writing table 2 can not shake forwards and backwards when the supporting step 2-A of the writing table 2 is supported on the chair back step 1-A, and the writing table 2 can be prevented from tilting backwards in the upward moving process of the writing table 2, so that the phenomenon that the writing table 2 is blocked due to the fact that the writing table 2 overturns backwards in advance occurs.

The left side and the right side of the step structure are respectively provided with a side wall structure 1-C which is formed by the back surface of the chair back 1 in a protruding mode and extends upwards, the left side and the right side of the writing table 2 are respectively attached to the corresponding side wall structures 1-C, and the writing table 2 is guided to move upwards so that the situation that the writing table 2 inclines leftwards or rightwards to cause deflection in the process of moving upwards is avoided. In addition, convex buckles 2-C connected with springs are arranged on the left side surface and the right side surface of the writing desk 2, grooves 1-C0 are arranged at corresponding positions of the side wall structures 1-C, when the supporting step 2-A of the writing desk 2 is supported on the chair back step 1-A, the convex buckles 2-C are embedded into the grooves 1-C0 to lock the writing desk 2, and the springs are compressed to be separated from the grooves 1-C0 when the writing desk 2 moves upwards.

And furthermore, the side wall structure 1-C and the sliding area surface 1-s both extend upwards to the top edge of the chair back 1, so that the side wall structure 1-C, the step structure and the sliding area surface 1-s form an invagination gap on the back surface of the chair back 1, and the writing table 2 is in a vertical state and completely fills the invagination gap when being supported on the step structure. Therefore, when the writing desk 2 is not used, the writing desk 2 and the chair back 1 are integrated in appearance, and the appearance is more attractive.

In order to further facilitate the use of the user, a lifting groove 2-D is arranged on the back of the writing desk 2 close to the far end, so that the user can conveniently lift the writing desk 2 upwards; the front surface of the writing table rear part 2-2 is provided with a long groove 2-21 extending in the left-right direction, and the long groove can be used for holding pens.

Example 2:

referring to fig. 7, a chair includes a chair back, a chair seat and armrests according to embodiment 1. The chair can be applied to the places such as classrooms, auditoriums, report halls, movie rooms and the like.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments can be modified, or some technical features can be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A chair back is characterized in that an accommodating cavity is formed in the chair back; the chair back is provided with a chair back step which extends left and right in a protruding manner from the back surface, and a window which penetrates through the accommodating cavity up and down is formed at the chair back step; the window is inserted with a writing table which is partially positioned in the accommodating cavity, is in a vertical state and is supported on the steps of the chair back; the writing table can move upwards for a certain distance and then gradually turn backwards until the writing table is in a horizontal state and is clamped between the front window edge and the rear window edge of the window.

2. The chair back of claim 1, wherein the front window rim and the writing desk each have a limiting structure and a mating structure that can abut against each other to limit the maximum distance that the writing desk can move upward and limit the writing desk from sliding backward during the backward tilting of the writing desk.

3. The chair back of claim 2, wherein the back of the writing table has at least two support members; the writing table is turned backwards, and the supporting part is always supported on the rear window edge when the writing table is in a horizontal state.

4. The chair back of claim 3, wherein the support member extends in a front-to-back direction of the writing desk; the writing table is of a hollow structure, the front part of the supporting piece penetrates into the writing table and supports the front surface of the writing table, and the rear part of the supporting piece is positioned on the back surface of the writing table.

5. The chair back of claim 4, wherein the support member is made of a rigid material; the chair back and the writing desk are made of plastic materials.

6. The chair back of claim 5, wherein the upper and lower window rims are fixedly connected with a reinforcing member made of a rigid material for increasing the structural strength of the upper and lower window rims when the writing desk is clamped.

7. The chair back of claim 3, wherein the back of the chair back has a sliding area surface above the chair back step for the writing desk to slide up and down; when the writing table is in a vertical state, the supporting part is always supported on the wall of the accommodating cavity, so that the front surface of the writing table is always attached to the sliding area surface of the chair back.

8. The chair back of claim 7, wherein the left and right sides of the step structure each form a side wall structure formed by a back protrusion of the chair back and extending upward, and the left and right sides of the writing desk each abut against a corresponding side wall structure.

9. The chair back of claim 8, wherein the side wall structure and the sliding section face each extend upwardly to a top edge of the chair back such that the side wall structure, the step structure, and the sliding section face form an undercut in a back surface of the chair back; the writing table is in a vertical state and completely fills the sunken gap when being supported on the step structure.

10. A chair comprising a chair back as claimed in any of claims 1 to 9, and further comprising a seat and arm rests.