CN208676717U

CN208676717U - Ergonomic chair

Info

Publication number: CN208676717U
Application number: CN201820514854.5U
Authority: CN
Inventors: 周骏; 王大秋
Original assignee: Zhejiang Malati Intelligent Furniture Technology Co Ltd
Current assignee: Zhejiang Shengtuo Furniture Technology Co., Ltd.
Priority date: 2018-04-12
Filing date: 2018-04-12
Publication date: 2019-04-02
Anticipated expiration: 2028-04-12

Abstract

The utility model discloses a kind of ergonomic chairs, including chair back component and seat assemblies, chair back component includes back bracket, back lower bracket and elastically-deformable seat back frame occurs under traction or squeezing action, and makes the above-mentioned relatively-stationary locking mechanism in three holding position；Carry on the back lower bracket by connecting rod connect seat assemblies, back pedestal lower end and back lower bracket upper end rotation connection, the upper and lower ends of seat back frame respectively with back frame upper, carry on the back lower bracket lower hinge；The utility model is when for different people or the same person different sitting posture state, back bracket can be adjusted in unlock, due to seat back frame high resilience, when back bracket being pushed to rotate, it will drive seat back frame to rotate and deformation, motive force of the elastic property of seat back frame as back bracket spinning reduction；When turning to the posture and angle of suitable user, locking mechanism is locked.

Description

Ergonomic chair

Technical field

The utility model relates to the technical field of the seat, in particular to a kind of ergonomic chair.

Background technique

Office chair obtains the universal approval of people and likes as people's work, widely used seat tool of living, and existing Public, one of essential furniture in domestic environment is acted on behalf, the regulatory function of office chair back is mostly that layback is adjusted currently on the market Section, back lifting adjusting, several functions of Lumbar lift adjustment.Because in the operating condition, the sitting posture of people is not fixed and invariable, It such as bends over the desk writing of leaning forward, sitting postures, the back state of human body such as eyes head-up browsing webpage are all different, fixed angle and shape The chair back be just unable to satisfy the use demands of different sitting postures.

Summary of the invention

The utility model overcomes above-mentioned the deficiencies in the prior art, provides one kind under different sitting posture states, Can adjusting back angle or shape can achieve the ergonomic chair of support human body back and waist completely.

The technical solution of the utility model is achieved in that

A kind of ergonomic chair, including chair back component and seat assemblies, the chair back component include back bracket, back Lower bracket and elastically-deformable seat back frame occurs under traction or squeezing action, and keeps above-mentioned three holding position relatively solid Fixed locking mechanism；It carries on the back lower bracket and seat assemblies, back pedestal lower end and the rotation connection of back lower bracket upper end is connected by connecting rod, The upper and lower ends of seat back frame respectively with back frame upper, back lower bracket lower hinge；When locking mechanism unlocks, back bracket Rotation, the upper lower link point linear distance of seat back frame change, so that shape and angle change occur for seat back frame； When locking mechanism locks, so that back bracket, back lower bracket and seat back frame three keep relatively-stationary posture.

Preferably, the locking mechanism includes the adjusting handle that limited block, locking plate and control locking plate move up and down Hand, limited block are arranged in back pedestal lower end, and multiple card slots, back pedestal lower end and back lower bracket upper end are provided on limited block Two axle beds be rotatablely connected by pin shaft, limited block is in pin shaft lower end；Locking plate mounting groove, lock are equipped on back lower bracket Stator mounting groove is in below limited block, and end cap is stamped outside locking plate mounting groove, and locking plate is in locking plate mounting groove and stays There is free gap, linear type socket is equipped on end cap, pin hole, the lock of regulation handle and back lower bracket are equipped on locking plate The rotation connection of stator mounting groove two sides, regulation handle middle part are fixed with bolt, and the socket that bolt passes through end cap is inserted into locking plate Pin hole in, regulation handle rotation drive bolt stir locking plate move up insertion the corresponding card slot of limited block in realize lock It is fixed.

Preferably, the detent block for limiting regulation handle rotation is equipped in regulation handle, it is right on back lower bracket It should be equipped with detent slot, when detent block and detent slot cooperate, regulation handle is no longer rotated.

Preferably, back bracket is in up-side down triangle, back bracket is by two lower vertical edges and a upper horizontal edge connection group At being respectively outward extended with engaging lug in upper horizontal edge left and right ends, the engaging lug is hinged by small axis and seat back frame top. The fastness and stability of back bracket can be improved in this way, while again can be in favor of simplifying the structure of itself, and improves beauty Degree.

Preferably, seat back frame lower end, which extends back, link block, the link block passes through small axis and back lower bracket Lower hinge.

Existing net chair makes that human body waist can be pushed up as far as possible in the middle part of the chair back, some is set to improve waist comfort level Sliding Lumbar is set, some improves chassis, so that waist can be pushed up when human body reclining always, but these all higher costs, knot Structure is complicated；Some carries out structural improvement to back frame, so that back frame waist designs for lordosis, the screen cloth set that stretches tight in back frame can be formed The Lumbar of one lordosis, this spline structure is relatively simple, and top waist effect can be realized by the change of shape, but is used in this way Moulding, due to the strain problem of screen cloth, screen cloth can be very loose among back frame, can thus reduce the elasticity of screen cloth Lumbar, pushes up Waist effect can give a discount, and play reaction, so that screen cloth among back frame is also at tensional state, need to be improved by technique, But this will increase complex degree of structure and cost；Preferably, seat back frame is integrally S-shaped, net is attached on seat back frame Cloth, the seat back frame middle and lower part are in face arch moulding, and the limit base in rear arch moulding, screen cloth middle part are equipped in the middle part of seat back frame Equipped with drawing seat, drawing base rear end is connected by traction belt with limit base, and screen cloth is protected under the action of the stretching backward of traction belt Hold tensioned state.Seat back frame is integrally S-shaped, can comply fully with the requirement of ergonomics size；Meanwhile screen cloth intermediate slack Part is stuck at limit base by drawing the compressing of seat, the drawing of traction belt, and such screen cloth intermediate slack part is at taut Tight device, the Lumbar that screen cloth middle and lower part is formed are also at tensioned state, form effectively stable support to human body waist

Preferably, the seat back frame includes the first, second frame side being vertically arranged, in the first, second frame Top cross-member and bottom transverse member are equipped between side, rear extends in the first, second oblique seat back frame of frame middle side part And cross to form limit base at middle part, limit base is rigid, and is equipped with first passed through for traction belt at the middle part of limit base and is led to Hole, the rear end of traction belt are connected with kelly after passing through first through hole, and kelly is stuck in limit base rear end.Limit base position is fixed and is located The rear in the middle part of the screen cloth, drawing seat first is that for abutted in the middle part of screen cloth and post-tensioning tightens screen cloth, second is that being led for connecting Drawstring；Traction belt pulls back screen cloth, and is limited at limit base position, so that the part of relaxation will be stretched tight in the middle part of screen cloth Tightly, so that the seat back frame middle and lower part in face arch moulding cooperates screen cloth, and it may be at the state tightened.

Preferably, the traction belt is an endless belt, the length of kelly is greater than the length of first through hole, kelly with lead The rear end socket of drawstring and the both ends of kelly are stuck in the first through hole two sides of limit base.With such a structure, facilitate tune It saves and connect.

Preferably, the drawing seat includes the drawing that rear side in the middle part of the tie rod and screen cloth of front side in the middle part of screen cloth is arranged in Fixing piece, the tie rod is in a strip shape, and the length of tie rod is greater than the length of tie rod fixing piece, in the middle part of tie rod fixing piece and tie rod It is fixedly linked, the front end of traction belt is limited between tie rod fixing piece and tie rod.Tie rod guarantees that certain length makes as far as possible Increase the contact area with screen cloth, tie rod is in a strip shape, and will not seem lofty and cause sense of discomfort to human body back；Tie rod and tie rod Fixing piece one in front and one in back and by screen cloth is held on wherein, and not only can protect screen cloth but also can guarantee makes to lead backward as far as possible in the middle part of screen cloth It draws, while facilitating connection traction belt again, achieve many things at one stroke.

Screen cloth more leans on middle section overrelaxation, in order to tighten screen cloth middle section as far as possible, preferably, the shape of tie rod Arc-shaped, the both ends of tie rod are extendable diagonally forward, and the thickness of tie rod is gradually reduced by middle part to both ends.The thickness of tie rod has transition Variation can make up recessed defect after shape caused by tightening backward among screen cloth, make whole to seem more beautiful.

Preferably, being equipped at least two positioning columns at the back side of tie rod, screw hole is provided on positioning column, positioning column passes through net Cloth is simultaneously connected with tie rod fixing piece by screw；Tie rod fixing piece is the box body of front end opening, and tie rod fixing piece rear end is equipped with Second through-hole, the front end of traction belt are connected with bayonet lock after passing through the second through-hole, and bayonet lock is stuck in tie rod fixing piece.Tie rod only passes through Positioning column passes through screen cloth, does not constitute excessive destruction to screen cloth, and can play the role of connecting tie rod fixing piece.

Preferably, the traction belt is an endless belt, the length of bayonet lock is greater than the length of the second through-hole, bayonet lock with lead The front end of drawstring is socketed and the both ends of bayonet lock are stuck in the second through-hole two sides in tie rod fixing piece.Bayonet lock only needs and traction belt Socket and the horizontal fixation that traction belt front end can be realized in tie rod fixing piece.

In order to guarantee certain contact area and make entirety more aesthetically pleasing, preferably, the length of tie rod is seat back frame The 1/2-2/3 of width.

Preferably, seat back frame generally plastic-injection forms, seat back frame is surrounded by card slot, the surrounding of screen cloth It is fixed in the card slot of seat back frame surrounding.

It is using the principles of the present invention and beneficial effect of above-mentioned technical proposal:

The utility model can be carried on the back in adjustment when for different people or the same person different sitting posture state in unlock Upper bracket, due to seat back frame high resilience, the linear distance of two hinge joints can be elongated above and below seat back frame, The length of seat back frame is elongated by force both can hingedly install with back frame upper, back lower bracket, push back bracket hair When raw rotation, it will drive seat back frame and rotate and deformation, the elastic property of seat back frame is as back bracket spinning reduction Motive force；When turning to the posture and angle of suitable user, locking mechanism is locked.

It further says, seat back frame middle and lower part described in the utility model forms Lumbar, seat back frame in face arch moulding It is whole S-shaped, the requirement of ergonomics size can be complied fully with；Meanwhile the part of screen cloth intermediate slack supporting by drawing seat Pressure, the drawing of traction belt, and be stuck at limit base, such screen cloth intermediate slack part is at tightening device, screen cloth middle and lower part The Lumbar of formation is also at tensioned state, and effectively stable support is formed to human body waist.

Detailed description of the invention

Fig. 1 is the structural schematic diagram that the utility model seat back frame covers with screen cloth in embodiment；

Fig. 2 is the structural schematic diagram of the utility model seat back frame in embodiment；

Fig. 3 is configuration state schematic diagram of the reverse side in the portion A in Fig. 2 when with drawing band connection；

Fig. 4 is traction belt and the disassembled form schematic diagram for pulling seat；

Fig. 5 is traction belt and the assembled state schematic diagram for pulling seat；

Fig. 6 is the side status schematic diagram of Fig. 1；

Fig. 7 is the fractionation structural representation of the utility model chair back component；

Fig. 8 is back bracket, the attachment structure schematic diagram for carrying on the back lower bracket；

Fig. 9 is the disassembled form schematic diagram of back bracket and regulation handle, locking plate；

Figure 10 is the structural schematic diagram for carrying on the back lower bracket；

Figure 11 is back bracket when locking mechanism is in the unlocked state, the connection status diagram for carrying on the back lower bracket；

Figure 12 be back holder pivots in place, schematic diagram when locking mechanism is in the lock state；

Figure 13 is the disassembled form schematic diagram of both back bracket, back lower bracket with seat back frame；

Figure 14 is the schematic diagram that chair back component is in original state；

Figure 15 be back holder pivots in place, schematic diagram when chair back component is in the lock state；

Figure 16 is the matching relationship schematic diagram of human body back curve and seat back frame curve when chair back component is not adjusted；

Figure 17 is the matching relationship schematic diagram of human body back curve and seat back frame curve after chair back component is adjusted.

Specific embodiment

Specific embodiment of the present utility model is as follows:

Embodiment: a kind of ergonomic chair of the utility model, as shown in Figure 16,17, including chair back component 19 and chair Holder assembly 20, seat assemblies 20 include the seat 22 of 21 top of chassis 21 and chassis, and 21 lower section of chassis is supported by base assembly 23, Base assembly 23 includes elevating lever 24 and star base 25.

As shown in Fig. 7-15, the chair back component 19 includes back bracket 26, back lower bracket 27 and is drawing or squeezing Effect is lower to occur elastically-deformable seat back frame 1, and makes the above-mentioned relatively-stationary locking mechanism in three holding position；Chair back frame Frame 1 forms for plastic-injection, as shown in Figure 1, being covered with screen cloth on seat back frame 1, seat back frame 1 is surrounded by card slot (not Diagram), the surrounding of screen cloth 2 is fixed in the card slot of 1 surrounding of seat back frame by filler rod (not shown).

The chassis 21 that lower bracket 27 connects seat assemblies 20 by connecting rod 28 is carried on the back, connecting rod 28 is a L shape connecting rod, back bracket 26 lower ends and back 27 upper end of lower bracket rotation connection, the upper and lower ends of seat back frame 1 respectively with 26 top of back bracket, back lower 27 lower hinge of frame；When locking mechanism unlocks, back bracket 26 is rotated, and the upper lower link point linear distance of seat back frame 1 occurs Variation, so that shape and angle change occur for seat back frame 1；When locking mechanism locks, so that back bracket 26, lower of back Frame 27 and 1 three of seat back frame keep relatively-stationary posture.

As shown in fig.7-12, the locking mechanism includes moving down on limited block 29, locking plate 30 and control locking plate 30 Dynamic regulation handle 31, the setting of limited block 29 are integrally formed in 26 lower end of back bracket and with back bracket 26, back bracket 26 In up-side down triangle, back bracket 26 is made of two lower vertical edges 32 and a upper connection of horizontal edge 33, and limited block 29 is by back 26 the lowermost apex of bracket extends downwardly, and is respectively outward extended with engaging lug 34 in upper 33 left and right ends of horizontal edge, described The ear 35 that is reserved by small axis and 1 top of seat back frame of engaging lug 34 it is hinged；1 lower end of seat back frame extends back and has connection Block 36, the link block 36 is by small axis and carries on the back the second small axle bed 51 of 27 lower part of lower bracket hingedly.

As shown in Fig. 7,8,10, multiple card slots 37,26 lower end of back bracket and back are provided on the lower end surface of limited block 29 Two axle beds 38 of 27 upper end of lower bracket are rotatablely connected by pin shaft 39, and limited block 29 is in 39 lower end of pin shaft；In back lower bracket 27 are equipped with locking plate mounting groove 40, and locking plate mounting groove 40 is in 29 lower section of limited block, is stamped end outside locking plate mounting groove 40 Lid 41, locking plate 30 is in locking plate mounting groove 40 and there are free gaps, is inserted in 41 center vertical of end cap equipped with linear type Mouth 42 is equipped with pin hole 43,40 two sides of locking plate mounting groove of regulation handle 31 and back lower bracket 27 at 30 center of locking plate The first small axle bed 50 be rotatablely connected, socket 45,45 middle part of socket are socketed in the middle part of the shaft 44 among regulation handle 31 It is fixed with bolt 46, the socket 42 that bolt 46 passes through end cap 41 is inserted into the pin hole 43 of locking plate 30, and regulation handle 31 is revolved Turn to drive bolt 46 to stir locking plate 30 and move up in the corresponding card slot of insertion limited block 37 and realizes locking.

It further says, the detent block 47 for limiting the rotation of regulation handle 31 is equipped in regulation handle 31, under back It is correspondingly provided on bracket 27 detent slot (not shown), when detent block 47 and detent slot cooperate, regulation handle 31 is no longer rotated.

When installing seat back frame 1, as shown in figure 13, the hinge joint and back 27 lower part of lower bracket hinge on 26 top of back bracket Straight-line distance is 740mm, and the spacing between two hinge joints up and down of seat back frame 1 itself is 710mm, due to chair back frame 1 high resilience of frame, therefore the linear distance of about 1 two hinge joint of seat back frame can elongate during installation, by the chair back The length of frame 1 is elongated by force both can hingedly install with 26 top of back bracket, back lower bracket 27, and back bracket is pushed to occur When rotation, it will drive seat back frame and rotate and deformation, the elastic property of seat back frame is as back bracket spinning reduction Motive force.

As shown in figure 16, in the initial state, human body back curve 48 and 1 front end surface curve of seat back frame are not extremely to paste It closes, being in particular in human body back curve 48, there are larger gaps 49 between 1 top of seat back frame above the waist；Back bracket 27 When rotating forward, 1 top of seat back frame is pushed to travel forward, the angle of seat back frame 1 just changes, while seat back frame 1 upper lower link point linear distance changes, and makes the shape of seat back frame 1 that some variations occur, and passes through regulation handle 31 control, so that 1 attitude stabilization of seat back frame is in preset state；As shown in figure 17,1 angle of seat back frame and attitudes vibration Afterwards, human body back curve 48 is bonded substantially with 1 front end surface curve of seat back frame, achievees the purpose that comfortable support.

In order to meet the needs of ergonomics, as shown in Fig. 1,2,6,7,1 whole design of seat back frame at S-shaped, And it is corresponding, 1 middle and lower part of seat back frame is in face arch moulding, and cooperation screen cloth forms the Lumbar 3 of an arch, seat back frame 1 middle part is equipped with the limit base 4 in rear arch moulding, and drawing seat 5 is equipped in the middle part of screen cloth 2, and drawing 5 rear end of seat passes through traction belt 6 and limit Position seat 4 is connected, and 2 middle section of screen cloth keeps tensioned state under the action of the stretching backward of traction belt 6.

Specifically, the seat back frame 1 includes the first, second frame side 7,8 being vertically arranged, first, second Top cross-member 9 and bottom transverse member 10 are equipped between frame side 7,8, in 7, the 8 oblique chair back frame in middle part of the first, second frame side Rear extends and crosses to form limit base 4 at middle part in frame 1, and briefly, limit base 4 is a curved rod, limit base 4 and the One, the second frame side 7,8 is integrally formed, and limit base 4 is rigid, and is equipped at the middle part of limit base 4 and passes through for traction belt 6 First through hole 11, the rear end of traction belt 6 is connected with kelly 12 after passing through first through hole 11, and kelly 12 is stuck in 4 rear end of limit base.

The traction belt 6 is an endless belt, and the length of kelly 12 is greater than the length of first through hole 11, kelly 12 and drawing With 6 rear end socket and the both ends of kelly 12 are stuck in 11 two sides of first through hole of limit base 4.

As shown in Figure 4,5, the drawing seat 5 includes 2 middle part of tie rod 13 and screen cloth being arranged on front side of 2 middle part of screen cloth The tie rod fixing piece 14 of rear side, the tie rod 13 is in a strip shape, and the length of tie rod 13 is the 1/2-2/3 of seat back frame width, draws The length of item 13 is greater than the length of tie rod fixing piece 14, is fixedly linked in the middle part of tie rod fixing piece 14 and tie rod 13, before traction belt 6 End is limited between tie rod fixing piece 14 and tie rod 13；The shape of tie rod 13 is arc-shaped, and the both ends of tie rod 13 are extendable diagonally forward, And the thickness of tie rod 13 is gradually reduced by middle part to both ends.

Specifically, it sets at the back side of tie rod 13 there are two positioning column 15, is provided with screw hole 16, positioning column 15 on positioning column 15 It is connected across screen cloth 2 and with tie rod fixing piece 14 by screw；Tie rod fixing piece 14 is the box body of front end opening, and tie rod is fixed 14 rear end of part is equipped with the second through-hole 17, and the front end of traction belt 6 is connected with bayonet lock 18 after passing through the second through-hole 17, and bayonet lock 18 is stuck in drawing In fixing piece 14；Specifically, the length of bayonet lock 18 is greater than the length of the second through-hole 17, the front end of bayonet lock 18 and traction belt 6 It is socketed and the both ends of bayonet lock 18 is stuck in 17 two sides of the second through-hole in tie rod fixing piece 14.

In application, two positioning columns 15 to be passed through to the hole location reserved among screen cloth 2, the front end of traction belt 6 is logical for specific installation It crosses bayonet lock 18 to be stuck in tie rod fixing piece 14, then tie rod 13 and tie rod fixing piece 14 is screwed, thus by screen cloth It is fixedly clamped, then pulls back traction belt 6, the part of screen cloth intermediate slack will be tauted, then 6 rear end of traction belt is worn Cross the first through hole 11 of limit base 4, then kelly 12 passed through into 6 rear end of traction belt and is stuck in 4 rear end of limit base, loose screen cloth by It in the post-tensioning of traction belt 6, and is stuck at limit base 4, is just constantly in tight state.

Finally, as shown in Figure 1, screen cloth is just by tight at S state, waist just forms the radian state of " S " type.Certainly The size and ratio of each position of back frame are by the calculating of science, and " S " the type radian of back frame side can comply fully with The requirement of ergonomics size, reaches the comfortable effect of backrest.

The preferred embodiment in the utility model is only intended to help to illustrate the utility model.Preferred embodiment is chatted there is no detailed All details are stated, also not limiting the utility model is only the specific embodiment.Obviously, according in this specification Hold, can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to preferably explain this reality With novel principle and practical application, so that skilled artisan be enable to utilize the utility model well.This reality It is limited only by the claims and their full scope and equivalents with novel.

Claims

1. a kind of ergonomic chair, including chair back component and seat assemblies, it is characterized in that: the chair back component includes back Bracket carries on the back lower bracket and elastically-deformable seat back frame occurs under traction or squeezing action, and makes above-mentioned three's holding position Set relatively-stationary locking mechanism；It carries on the back lower bracket and seat assemblies, back pedestal lower end and back lower bracket upper end is connected by connecting rod Rotation connection, the upper and lower ends of seat back frame respectively with back frame upper, back lower bracket lower hinge；Locking mechanism unlock When, the upper lower link point linear distance of back holder pivots, seat back frame changes, so that shape occurs for seat back frame With angle change；When locking mechanism locks, so that back bracket, back lower bracket and seat back frame three keep relatively-stationary appearance State.

2. a kind of ergonomic chair according to claim 1, it is characterized in that: the locking mechanism include limited block, The regulation handle that locking plate and control locking plate move up and down, limited block are arranged in back pedestal lower end, are provided on limited block Two axle beds of multiple card slots, back pedestal lower end and back lower bracket upper end are rotatablely connected by pin shaft, and limited block is in pin shaft Lower end；Locking plate mounting groove is equipped on back lower bracket, locking plate mounting groove is in below limited block, locking plate mounting groove outer cover There is end cap, locking plate is in locking plate mounting groove and there are free gaps, linear type socket is equipped on end cap, in locking plate It is equipped with pin hole, the locking plate mounting groove two sides rotation connection of regulation handle and back lower bracket, the fixation of regulation handle middle part is set There is bolt, bolt passes through in the pin hole of socket insertion locking plate of end cap, and regulation handle rotation drives bolt to stir locking plate It moves up in the insertion corresponding card slot of limited block and realizes locking.

3. a kind of ergonomic chair according to claim 2, it is characterized in that: being equipped in regulation handle for limiting tune The detent block for saving handle rotation is correspondingly provided with detent slot on back lower bracket, and when detent block and detent slot cooperate, regulation handle is not It is rotated further by.

4. a kind of ergonomic chair according to claim 1, it is characterized in that: back bracket is in up-side down triangle, back branch Frame is made of two lower vertical edges and a upper horizontal edge connection, is respectively outward extended with engaging lug in upper horizontal edge left and right ends, described Engaging lug by small axis and seat back frame top it is hinged.

5. a kind of ergonomic chair according to claim 1, it is characterized in that: seat back frame lower end, which extends back, connection Block, the link block pass through small axis and back lower bracket lower hinge.

6. a kind of ergonomic chair according to claim 1, it is characterized in that: seat back frame is integrally S-shaped, in chair back frame Screen cloth is attached on frame, the seat back frame middle and lower part is in face arch moulding, and the limit in rear arch moulding is equipped in the middle part of seat back frame Position seat, screen cloth middle part are equipped with drawing seat, and drawing base rear end is connected by traction belt with limit base, and screen cloth is pulled back traction belt Tensioned state is kept under the action of stretching.

7. a kind of ergonomic chair according to claim 6, it is characterized in that: the seat back frame includes being vertically arranged The first, second frame side, between the first, second frame side be equipped with top cross-member and bottom transverse member, first, second Rear extends and crosses to form limit base at middle part in the oblique seat back frame of frame middle side part, and limit base is substantially rigid, The middle part of limit base is equipped with the first through hole passed through for traction belt, and the rear end of traction belt is connected with kelly after passing through first through hole, Kelly is stuck in limit base rear end.

8. a kind of ergonomic chair according to claim 7, it is characterized in that: the traction belt is an endless belt, card The length of bar is greater than the length of first through hole, and the rear end socket of kelly and traction belt and the both ends of kelly are stuck in the of limit base One through-hole two sides.

9. a kind of ergonomic chair according to claim 6, it is characterized in that: the drawing seat includes being arranged in screen cloth The tie rod fixing piece of rear side in the middle part of tie rod and screen cloth on front side of middle part, the tie rod is in a strip shape, and the length of tie rod, which is greater than, draws Be fixedly linked in the middle part of the length of fixing piece, tie rod fixing piece and tie rod, the front end of traction belt be limited in tie rod fixing piece with Between tie rod.

10. a kind of ergonomic chair according to claim 9, it is characterized in that: the shape of tie rod is arc-shaped, the two of tie rod Hold extendable diagonally forward, and the thickness of tie rod is gradually reduced by middle part to both ends.

11. a kind of ergonomic chair according to claim 9, it is characterized in that: being equipped at least two at the back side of tie rod Positioning column, screw hole is provided on positioning column, and positioning column passes through screen cloth and is connected with tie rod fixing piece by screw；Tie rod fixing piece is The box body of one front end opening, tie rod fixing piece rear end are equipped with the second through-hole, and the front end of traction belt is connected with after passing through the second through-hole Bayonet lock, bayonet lock are stuck in tie rod fixing piece.

12. a kind of ergonomic chair according to claim 11, it is characterized in that: the traction belt is an endless belt, The length of bayonet lock is greater than the length of the second through-hole, the front end socket of the bayonet lock and traction belt and both ends of bayonet lock are stuck in tie rod and fix The second through-hole two sides in part.

13. a kind of ergonomic chair according to claim 1, it is characterized in that: seat back frame generally plastic-injection and At seat back frame is surrounded by card slot, and the surrounding of screen cloth is fixed in the card slot of seat back frame surrounding.