CN114098335A

CN114098335A - Chair with detachable top

Info

Publication number: CN114098335A
Application number: CN202111361512.7A
Authority: CN
Inventors: 陈琼
Original assignee: Foshan Gudiju Furniture Co ltd
Current assignee: Anji Hexuan Home Furnishings Co ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-03-01
Anticipated expiration: 2041-11-17
Also published as: CN114098335B

Abstract

The invention discloses a chair, which comprises two chair frames arranged at intervals left and right, a chair surface layer fixed by the two chair frames and opened left and right, a chair foot rest and a base connected with the chair foot rest, wherein the chair surface layer is provided with a plurality of chair legs; the two chair frames are respectively provided with an adjusting seat movably connected with the base; when the load of the chair surface layer is stressed, the adjusting seat drives the chair frame to move relative to the base so as to buffer the sharp increase of the tensity of the chair surface layer. The invention has the beneficial effect that the chair surface layer can be well protected.

Description

Chair with detachable top

Technical Field

The invention relates to a chair.

Background

The production and manufacturing industry of chairs has the cost including material cost, labor cost, manufacturing cost and transportation cost, wherein a very important factor influencing the transportation cost is the cabinet loading amount of the chair, and for the chair capable of being assembled and disassembled, the occupied space before the chair is assembled is inversely proportional to the cabinet loading amount, so that the volume compression ratio when the chair is assembled is an important means for saving the transportation cost.

For example, patent application publication No. CN204336339U discloses a folding chair, which comprises a chair back, a chair seat, a connecting member, and a locking member, wherein the chair back and the chair seat are rotatably connected by the connecting member, the chair back and the chair seat rotate around the connecting member between a first position and a second position, wherein in the first position, the chair back is substantially located at an upright position, in the second position, the folded chair back is located at a position attached to the chair seat, the locking member comprises a first portion and a second portion, the first portion is located on the chair back, the second portion is located on the chair seat, the first portion and the second portion of the locking member are engaged, and the chair back can move relative to the chair seat in the direction of the rotation axis of the chair seat, so that the first portion and the second portion are locked or disengaged, and further relative rotation of the chair back and the chair seat is prevented or allowed. The chair has the advantages that the components of the connecting piece and the locking piece for realizing the folding function of the chair back are more, and the structure is relatively complex. Because the folding function of accomodating is mainly used in the transportation, and the probability of use is lower when using in reality, consequently increases the cost on this part of function and seems the cost performance lower.

For example, patent application publication No. CN201346027 discloses a chair, particularly a leg-foldable chair structure, which can be easily disassembled and folded without using tools. The chair comprises a chair back plate, a chair seat plate, a left chair leg frame and a right chair leg frame, wherein plugs are symmetrically fixed on the left side and the right side of the chair back plate; the head parts of the chair leg frames are respectively provided with an insertion pipe, and the plug can be tightly inserted into the insertion pipes; the chair leg frames are respectively provided with a cross arm, and the chair seat plate is movably connected with the cross arms. The folding chair structure can realize the folding function of the chair through simple plugging and unplugging actions, does not need any tool, and can conveniently fold the chair backrest and the chair seat frame, thereby reducing the space occupation and saving the storage and transportation cost. The chair can preferably reduce the occupied space, but the number of parts required to be assembled is too many, which is troublesome for users, especially users with poor manual ability.

In addition, to the chair that the office space used, the user is longer when sitting, and the permeability of user's buttock and back requires comparatively highly, for example the patent application that publication number is CN201509912U discloses a net chair, and it includes from lower chair leg, chair frame, seat support and the back of the chair that sets gradually, the seat support includes chair seat frame and screen cloth, and the screen cloth is tightened and is installed edge on the chair seat frame, and the back of the chair includes back of the chair frame and screen cloth, and the screen cloth is tightened and is installed in the week edge of back of the chair frame, and the both sides fretwork shaping of chair seat frame has the bracing piece of crisscross setting. The mesh cloth has the characteristics of good air permeability and good elasticity, and can be deformed along with the weight of the buttocks and the back of a human body when a person sits on the mesh chair and leans against the mesh chair, so that the mesh cloth is comfortable to use; after the mesh cloth is used for a certain time, the mesh cloth can be cleaned only by using a cleaning tool to wash the mesh cloth, and the cleaning is convenient; the supporting rods which are formed in a hollow-out mode and arranged in a staggered mode on the two sides of the chair seat frame can increase supporting force of the chair seat frame and enable the stress range of the chair seat frame to be larger, and the weight of the chair seat frame can be reduced and the net chair is lighter. This chair is in the state of tightening through being in the screen cloth, and the rate of tension of screen cloth can obtain a surge when the user sits down, and the screen cloth appears the rate of tension reduction easily after long-time the use, local lax, the screen cloth edge appears damaged with the junction of seat support.

Disclosure of Invention

The invention aims to provide a chair which can well protect a chair surface layer.

The invention is realized by the following technical scheme.

A chair comprises two chair frames which are arranged at intervals left and right, a chair surface layer which is fixed by the two chair frames and is opened left and right, chair foot frames and a base which is connected with the chair foot frames; the two chair frames are respectively provided with an adjusting seat movably connected with the base; when the load of the chair surface layer is stressed, the adjusting seat drives the chair frame to move relative to the base so as to buffer the sharp increase of the tensity of the chair surface layer.

As a further improvement of the invention, the two adjusting seats are respectively and rotatably connected to the left end and the right end of the base, and the rotating axes of the two adjusting seats extend along the front-back direction; the two adjusting seats can rotate in opposite directions to change the left-right distance between the two chair frames, and rotate in the same direction to change the left-right inclination amplitude of the two chair surface layers.

As a further improvement of the invention, the base and the adjusting seat are respectively provided with a first limit structure and a second limit structure which can block each other, so as to limit the maximum angle of the adjusting seat which is turned downwards relative to the base and limit the maximum threshold value of the left-right distance between the two chair frames.

As a further improvement of the invention, a first elastic reset piece is arranged between the base and the adjusting seat and used for driving the adjusting seat to rotate and reset.

As a further improvement of the invention, at least one supporting frame is arranged between the two chair frames, and the left end and the right end of the supporting frame are respectively connected with the corresponding chair frames; and in the process that the left-right distance between the two chair frames is gradually reduced from the maximum threshold value, the supporting frame always applies supporting force for resisting the continuous reduction of the left-right distance to the two chair frames.

As a further improvement of the present invention, the seat frame includes a seat frame extending substantially forward and backward, and a back frame extending substantially upward and downward; the chair surface layer comprises a chair seat surface layer which is fixed by two chair seat frames and is supported from left to right, and a chair back surface layer which is fixed by two chair back frames and is supported from left to right.

As a further improvement of the invention, the supporting frames are respectively arranged between the front parts of the two seat frames, in front of the adjusting seat and between the upper parts of the two back frames.

As a further improvement of the invention, a waist support is arranged between the two chair back frames at a position corresponding to the waist of a user, and the left end and the right end of the waist support are respectively connected with the corresponding chair back frames and can support the chair back surface layer.

As a further improvement of the invention, the base is rotatably connected to the top end of the chair foot rest, and the rotation axis thereof extends in the left-right direction.

As a further improvement of the invention, a second elastic reset piece is arranged between the base and the top end of the chair foot rest and is used for driving the base to rotate and reset.

The invention has the beneficial effects that:

according to the invention, the buffer effect of the rapid increase of the tension degree of the chair surface layer when the chair surface layer is loaded and pressed is realized through the rotary connection of the adjusting seat and the base, the irreversible stretching deformation of the chair surface layer can be avoided, and the damage of the connection between the edge of the chair surface layer and the chair frame can be avoided; moreover, the function of the chair for left and right leisure can be provided.

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 view of a chair;

FIG. 2 is a schematic structural view of the chair with the seat layer removed;

FIG. 3 is a schematic structural view of the chair frame;

FIG. 4 is an exploded view of the chair frame;

FIG. 5 is a schematic structural view of a skeleton;

FIG. 6 is a schematic structural view of the engagement frame;

FIG. 7 is a schematic structural view of a base structure;

FIG. 8 is an exploded view of the base mechanism;

FIG. 9 is a schematic view of the rotation of the adjustment seat during loading;

FIG. 10 is a schematic view of the adjustment of the seat during the left and right rocking of the chair.

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.

Referring to fig. 1-10, a chair comprises two chair frames 1 arranged at intervals left and right, a chair surface layer 2 fixed by the two chair frames 1 and opened left and right, a chair leg frame 4, and a base mechanism 3 connected with the chair leg frame 4.

The chair frame 1 comprises a chair seat frame 11 extending basically back and forth, a chair back frame 12 extending basically up and down, a connecting frame 13 connecting the rear end of the chair seat frame 11 and the bottom end of the chair back frame 12, and a framework 14. It should be noted that the seat frame 11 and the back frame 12 are not straight structures, but are curved due to ergonomics, but the extending directions of the two are front and back and up and down.

The chair surface layer 2 is a surface layer structure which has a certain stretching degree and can be tensioned, can support the buttocks of a user and the back of the user, preferably uses mesh cloth, has the characteristics of good fabric air permeability, large friction force and softness, and has excellent air permeability and rebound resilience under the condition of ensuring bearing. Specifically, the seat surface layer 2 includes a seat surface layer 21 fixed to the two seat frames 11 and stretched in the left-right direction, and a back surface layer 22 fixed to the two back frames 12 and stretched in the left-right direction.

The engaging frame 13 is made of an elastic material, such as rubber, silica gel, natural rubber, and the like, and has strong properties of bending deformation under pressure and resilience to recover the original shape. The framework 14 is made of a rigid material, such as a metal product made of stainless steel, and has high structural strength. The connecting member has an arc-shaped segment structure, and naturally extends the front-rear extension direction of the seat frame 11 to the up-down extension direction of the seat back frame 12.

When the connecting frame 13 is not provided with the framework 14, the connecting frame can be bent and deformed so that the back frame 12 can be turned over forwards, and the back frame 12 and the seat frame 11 can be folded, so that the space occupied by the chair in the vertical direction can be compressed, and the cabinet loading amount can be increased. When the frame 14 is assembled to the engaging frame 13, that is, after the chair is assembled, the frame 14 can support the engaging frame 13 so that the engaging frame 13 can maintain its original shape without deformation, thereby making the chair frame 1 a firm and stable structure.

The seat frame 11 and the back frame 12 need to have certain rigidity as the supporting main body of the seat frame 1, so that the seat frame 1 becomes a foldable structure body with soft elasticity only at the bending part, and compared with other mechanical structures such as joints and hinges, the structure has fewer components and simpler overall structure, is not easy to cause mechanical failure, and has relatively lower production cost.

Further, a surface of the engaging frame 13 has a mounting groove 131 recessed inward and extending in an extending direction of the engaging frame 13, and the frame 14 is inserted into the mounting groove 131. The mounting groove 131 is preferably disposed on the inner side of the engagement frame 13, so that the appearance of the frame 14 can be prevented from being affected by exposure, and the probability of damage to the frame 14 from the external environment such as collision can be reduced. The framework 14 is in an arc-shaped sheet structure in structural shape, and of course, since the engaging frame 13 is made of elastic material, the framework 14 is made of rigid material, and the framework 14 is slightly larger than the mounting groove 131 in size, so that the framework 14 is embedded in the mounting groove 131 in an interference manner, and the framework 14 is prevented from being loosened in the mounting groove 131. In addition, the widths of the frame 14 and the mounting grooves 131 should be increased as much as possible, so that the frame 14 has better supporting performance.

In order to further improve the structural strength and structural stability of the assembled chair frame 1, one surface of the seat frame 11 and the back frame 12 has an extension groove 132 engaging with the mounting groove 131, and obviously, the surface of the extension groove 132 is also the inner side surface of the seat frame 11 and the back frame 12. The two ends of the framework 14 are respectively embedded into the corresponding extension grooves 132, and similarly, the framework 14 is slightly larger than the extension grooves 132 in size.

The both ends of skeleton 14 can dismantle the connection with seat frame 11, back of the chair frame 12 respectively, compare in linking frame 13 with elastic material, skeleton 14 and seat frame 11, back of the chair frame 12 fixed connection have better connection stability, and the mode of adopting to dismantle the connection is also convenient for the dismantlement dress cabinet of seat frame 1. More specifically, the frame 14 is fixedly connected to the seat frame 11 and the back frame 12 by a plurality of fasteners.

In order to increase the load of the shear stress applied to the engagement frame 13 and the structural strength of the engagement frame 13 in the inner and outer width directions, the bottom of the mounting groove 131 has at least one reinforcing groove 133 recessed inward and extending in the extending direction of the mounting groove 131, and the surface of the framework 14 attached to the bottom of the mounting groove 131 has a reinforcing structure 141 inserted into the reinforcing groove 133. More specifically, two reinforcing grooves 133 are formed at the intersection of the groove bottom and the two groove walls of the mounting groove 131, and correspondingly, reinforcing structures 141 which are folded edges are formed on two sides of the framework 14.

The engaging frame 13 has a plurality of partition grooves 134 arranged at intervals along the extending direction thereof, and the partition grooves 134 form notches at least at the inwardly curved surface of the engaging frame 13. In this embodiment, the partition grooves 134 are notched on the inner side and the top (inner curved surface). In the process of gradually folding the connecting piece, the width of the blocking groove 134 is continuously compressed, so that the buffer effect is achieved, the irreversible deformation damage caused by overhigh local extrusion force of the connecting frame 13 when the seat frame 11 and the back frame 12 are folded can be avoided, and meanwhile, the blocking groove 134 can also enable the connecting frame 13 to be more easily bent, so that the labor is saved during folding. The number, spacing distance, and groove width of the partition grooves 134 are determined according to the actual application.

Although the link frame 13 can be supported by the frame 14 and the link member can be connected to the seat frame 11 and the back frame 12 well, misalignment between both ends of the link frame 13 and the rear end of the seat frame 11 and the bottom end of the back frame 12 is likely to occur. Therefore, a connecting member 15 is provided between both ends of the link frame 13 and the rear end of the seat frame 11/the bottom end of the back frame 12 for connecting both ends of the link member to the rear end of the seat frame 11/the bottom end of the back frame 12. Due to the elastic material of the connecting element, one part of the connecting element 15 is embedded in the connecting frame 13, and the other part is fixed on the seat frame 11/the back frame 12. The portion of the connecting member 15 inserted into the engaging frame 13 functions like the frame 14 to support the end portion of the engaging frame 13, and the other portion of the connecting member 15 is fixedly connected to the seat frame 11/the back frame 12 to improve the connection stability.

More specifically, the connecting member 15 includes a first connecting member portion 151 and a second connecting member portion 152, and the first connecting member portion and the second connecting member portion 152 are both plate-shaped structures and are integrally connected in a folded angle relationship. The connecting piece 15 is the same as the framework 14 and is also made of rigid materials. The groove bottom of the mounting groove 131 is provided with inwardly recessed caulking grooves 135 near both ends, the first connecting part 151 is embedded in the caulking groove 135, and the first connecting part 151 is slightly larger than the caulking groove 135 in size, so that the first connecting part 151 is not easy to loose in the caulking groove 135. The second connecting part 152 is attached to the groove bottoms of the mounting grooves 131 and the extension grooves 132, and the frame 14 is attached to the second connecting part 152, so that the second connecting part 152 is sandwiched between the mounting grooves 131 and the groove bottoms of the extension grooves 132 and the frame 14, and the second connecting part 152 and the extension grooves 132 are fixed together. First, the connecting member 15 not only serves to connect the end of the link member with the rear end of the seat frame 11/the bottom end of the back frame 12, but the insertion of the first portion 151 of the connecting member in the insertion groove 135 further increases the load of the shear stress applied to both ends of the link member; and the second portion 152 of the connecting member is sandwiched between the mounting groove 131, the groove bottom of the extension groove 132 and the frame 14, so that the fixing strength to the seat frame 11/back frame 12 can be improved. In addition, the connector second portion 152 and the extension slot 132 are also removably secured together using a plurality of fasteners.

The two chair seat frames 11 are respectively detachably connected to the left end and the right end of the base mechanism 3, and the two chair seat frames 11 can be compressed left and right when being used for loading a cabinet, and the chair surface layer 2 is also folded at the same time, so that the chair can compress the space occupied transversely.

The space that can occupy through compressing the chair in horizontal, vertical two directions can increase substantially the dress cabinet volume of chair, saves the cost of commodity circulation transportation.

It should be noted that, in order to prevent the seat surface layer 21 from directly collapsing downward when the user sits on the chair after assembling, the seat surface layer 21 is in a tensioned state, that is, the seat surface layer 21 is stretched out to some extent from the left to the right, so that the buttocks of the user can be stably supported. However, when the seat surface layer 21 is naturally opened to the left and right, the left-right distance between the two seat frames 11 is smaller than the left-right distance after the chair is assembled, and therefore, there is a certain dimensional deviation in the installation, that is, the seat frames 11 and the base mechanism 3 need to be connected and installed in a state where the seat surface layer 21 is stretched to the left and right. It is difficult for the user to maintain the seat covering 21 stretched apart during assembly without the aid of tools and to control the magnitude of the stretching so that alignment of the seat frame 11 and the base unit 3 is difficult.

Based on this technical problem, base mechanism 3 includes base 31, two respectively with the seat frame 11 that corresponds can dismantle the regulation seat 32 of being connected, two adjust the seat 32 and rotate respectively and connect in the left and right sides both ends of base 31 to the axis of rotation between them all extends along the fore-and-aft direction, two adjust the seat 32 and can rotate the left and right sides interval change that makes two seat frames 11 in opposite direction. Two adjust seat 32 simultaneously can reduce the left and right sides interval at base mechanism 3 both ends when upwards overturning for base 31, the user when the equipment, can ignore seat support surface course 21 whether stretched out, earlier with two seat support 11 respectively with the regulation seat 32 fixed connection that corresponds, then push down two seat support 11 or upwards push up base 31, just can make two adjust seat 32 overturn downwards for base 31 to increase the left and right sides interval of two seat support 11, be about being about to seat support surface course 21 stretch out and make it be in the tensioning state.

After the two adjusting seats 32 are turned downwards relative to the base 31 to a state that the three are flush, if the two adjusting seats are turned downwards continuously, the left-right distance between the two seat frames 11 is reduced, and therefore, the base 31 and the adjusting seats 32 are respectively provided with a first limiting structure 311 and a second limiting structure 321 which can block each other, and the first limiting structure and the second limiting structure are used for limiting the maximum threshold value of the left-right distance between the two seat frames 1. Due to the self-weight of the seat frame 11 and the adjusting seat 32, the adjusting seat 32 and the base 31 can be stably maintained in a state where the first limiting structure 311 and the second limiting structure 321 block each other without being subjected to an external force. In addition, when the first limiting structure 311 and the second limiting structure 321 block each other, the adjusting seat 32 may be flush with the base 31, or the adjusting seat 32 may be slightly tilted upward relative to the base 31.

Seat frame 11 adjust seat 32 and establish slot 111, insert structure 322 respectively, insert structure 322 is inserted and is established in slot 111 for inject seat frame 11 and adjust the relative position of seat 32, seat frame 11 and adjust seat 32 use a plurality of fasteners to realize dismantling the connection, during the equipment, insert the insert structure 322 of adjusting seat 32 earlier and establish on seat frame 11's slot 111, and then use the fastener to connect, be convenient for find accurate connection installation position.

Since the adjusting seat 32 is adjusted by rotating, it is difficult to satisfy that the inserting structure 322 is completely aligned with the slot 111, and therefore a gap is provided between the inserting structure 322 and the slot 111 for easy insertion, which is easy to cause looseness therebetween. Therefore, the adjusting seat 32 has a blocking structure 323, the blocking structure 323 abuts against the side surface of the seat frame 11 close to the base 31 to prevent the seat frame 11 and the adjusting seat 32 from moving relatively, and a groove is formed between the inserting structure 322 and the blocking structure 323, so that the seat frame 11 and the adjusting seat 32 are inserted into each other.

It should be noted that, when the load of the chair surface layer 2 is pressed (when the user sits on the chair seat surface layer 21), the tightness of the chair seat surface layer 21 will increase sharply, and especially, when the user with a large weight and the user sit on the chair seat surface layer 21 quickly, the degree of the sharp increase of the tightness will be increased, and this condition also easily causes irreversible stretching damage to the chair seat surface layer 21, so that the service life of the chair seat surface layer is shortened, and the edge of the chair seat surface layer 21 fixed on the chair seat frame 11 is also easily damaged. Just because adjust seat 32 and base 31's rotation connection relation, when seat surface course 2 is compressed, the acting force can be exerted to seat frame 11 to the surge of seat surface course 21 rate of tension, thereby make and adjust seat 32 and can upwards overturn for base 31, shorten two intervals about seat frame 11, then reduced the degree that seat surface course 21 rate of tension surge, certain cushioning effect has been played, can reduce the damage that seat surface course 21 received, in order to prolong its life, also can have certain elastic buffer simultaneously, reduce the harsh sense of the user sitting on seat surface course 21, and the comfort level is improved.

The two adjusting seats 32 are rotated in opposite directions (i.e. the two adjusting seats 32 are simultaneously turned upwards or downwards relative to the base 31) so that the left-right distance between the two chair frames 1 is changed, and the two adjusting seats 32 are rotated in the same direction (i.e. one adjusting seat 32 is turned upwards relative to the base 31 and the other adjusting seat 32 is turned downwards relative to the base 31) so that the left-right inclination amplitude of the two chair face layers 2 is changed. When a user sits on the seat surface layer 21 and tilts his body to the left or right, the two adjustment bases 32 are rotated in the same direction, thereby allowing the chair to have a function of rocking left or right. Correspondingly, the first limiting structure 311 and the second limiting structure 321, which are blocked from each other, can also be used to limit the maximum angle of the adjusting seat 32 that is turned downward relative to the base 31, i.e. the maximum amplitude of the left and right rocking is limited.

A first elastic reset piece 3-1 is arranged between the base 31 and the adjusting seat 32, the first elastic reset piece 3-1 is used for driving the adjusting seat 32 to rotate and reset, a spring is preferably used, and when a user stands up or sits up, the auxiliary seat surface layer 21 and the base connecting layer are quickly restored to a horizontal state.

Two be equipped with at least one support frame 5 between the chair frame 1, corresponding chair frame 1 is connected respectively at both ends about support frame 5, support frame 5 is two the interval is by the in-process that maximum threshold value reduces gradually about the chair frame 1, applys the holding power that is used for resisting to control the interval and continues to reduce to two chair frames 1 all the time to can further reduce chair seat surface course 21 rate of tension increases's degree, has improved buffering effect. In addition, the left end and the right end of the support frame 5 are detachably connected with the corresponding chair frame 1, and the chair seat frame 11 is firstly connected with the adjusting seat 32 and then connected with the support frame 5 during assembly. In the present embodiment, the supporting frame 5 is a long sheet structure having a certain curvature, and is made of a plastic material so that it can withstand a certain degree of bending deformation.

The support frame 5 is a beam structure directly connecting the two chair frames 1, and the support frame 5 is respectively arranged between the front parts of the two chair seat frames 11 and positioned in front of the adjusting seat 32 and between the upper parts of the two back-of-chair frames 12, so that the two chair seat frames 11 and the two support frames 5 form a closed structure, and the overall structural stability and the deformation resistance can be improved.

Two the position that corresponds user's waist between back of the chair frame 12 is equipped with the waist and holds in the palm 6, the waist holds in the palm 6 about both ends and connects the back of the chair frame 12 that corresponds respectively, and can support back of the chair surface course 22, user's rear portion can play better supporting role to the waist when supporting completely on back of the chair surface course 22, accords with the ergonomic requirement to can improve the comfort level.

In addition, the base 31 is pivotally connected to the top end of the chair foot rest 4, and the pivot axis thereof extends in the left-right direction, so that the chair has the function of a front-back leisure and the two functions of the front-back leisure and the left-right leisure are independent of each other and do not interfere with each other. A second elastic restoring member 3-2 is arranged between the base 31 and the top end of the chair foot rest 4 for driving the base 31 to rotate and restore, and the second elastic restoring member 3-2 also preferably uses a spring.

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 is characterized by comprising two chair frames which are arranged at intervals from left to right, a chair surface layer which is fixed by the two chair frames and is expanded from left to right, a chair foot rest and a base which is connected with the chair foot rest; the two chair frames are respectively provided with an adjusting seat movably connected with the base; when the load of the chair surface layer is stressed, the adjusting seat drives the chair frame to move relative to the base so as to buffer the sharp increase of the tensity of the chair surface layer.

2. The chair as claimed in claim 1, wherein the two adjusting seats are rotatably connected to left and right ends of the base, respectively, and the rotation axes of the two adjusting seats extend in the front-rear direction; the two adjusting seats can rotate in opposite directions to change the left-right distance between the two chair frames, and rotate in the same direction to change the left-right inclination amplitude of the two chair surface layers.

3. The chair as claimed in claim 2, wherein the base and the adjusting seat have first and second mutually blocking limiting structures for limiting a maximum angle of the adjusting seat relative to the base for tilting downward and a maximum threshold for limiting a left-right distance between the two frames.

4. A chair according to claim 2 or 3, wherein a first elastic reset member is disposed between the base and the adjusting seat for driving the adjusting seat to rotate and reset.

5. The chair according to claim 2, wherein at least one support frame is arranged between the two chair frames, and the left end and the right end of each support frame are respectively connected with the corresponding chair frame; and in the process that the left-right distance between the two chair frames is gradually reduced from the maximum threshold value, the supporting frame always applies supporting force for resisting the continuous reduction of the left-right distance to the two chair frames.

6. The chair according to claim 5, wherein the seat frame includes a seat frame extending forward and backward, and a back frame extending upward and downward; the chair surface layer comprises a chair seat surface layer which is fixed by two chair seat frames and is supported from left to right, and a chair back surface layer which is fixed by two chair back frames and is supported from left to right.

7. A chair according to claim 6, wherein the support frame is provided between the front parts of the two seat frames and between the upper parts of the two back frames in front of the adjustable seat.

8. The chair according to claim 1, wherein a waist support is provided between the two back frames at a position corresponding to the waist of the user, and the left and right ends of the waist support are respectively connected with the corresponding back frames and can support the back layer.

9. The chair as claimed in claim 1, wherein the base is rotatably connected to the top end of the leg frame, and the rotation axis thereof extends in the left-right direction.

10. The chair as claimed in claim 9, wherein a second elastic restoring member is provided between the base and the top end of the seat leg frame for driving the base to rotate and restore.