CN208540957U

CN208540957U - A kind of waist bracket chair being driven by sprocket wheel

Info

Publication number: CN208540957U
Application number: CN201721788593.8U
Authority: CN
Inventors: 欧亚平; 吴青松
Original assignee: Individual
Current assignee: Anji Shengxin Office Furniture Co ltd
Priority date: 2017-12-20
Filing date: 2017-12-20
Publication date: 2019-02-26
Anticipated expiration: 2027-12-20

Abstract

The utility model relates to seat design manufacturing fields, and in particular to a kind of waist bracket chair being driven by sprocket wheel.The utility model, which relates to, has the technical scheme that a kind of waist bracket chair being driven by sprocket wheel, include waist support, gas spring, rotating assembly and transmission parts, the rotating assembly includes main shaft, the waist support is rotated using the main shaft as axis, the rotation is the flexible transmission by the transmission parts of the gas spring and realizes that the transmission parts include the linking arm connecting with the gas spring, the gear being connected on the linking arm, the gear linkage and chain that connect with the rotating assembly.The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of waist bracket chair being driven by sprocket wheel.When user is moved forward and backward on the seat, waist support can be close to human waist and back and make synchronizing moving, be bonded in real time to waist, increase the support force to human body waist position.

Description

A kind of waist bracket chair being driven by sprocket wheel

Technical field

The utility model relates to seat design manufacturing fields, and in particular to a kind of waist bracket chair being driven by sprocket wheel.

Background technique

Seat is a kind of furniture that purposes is very extensive in daily life and work, generally comprises pedestal, backrest, support knot The components such as structure, handrail bring more comfortable and health usage experience, the knot of seat to meet the needs of people's personalization Structure and function are also constantly being improved.When user uses seat, the buttocks of oneself is often supported by pedestal and backrest And back, and the support phase of waist, to just weaker, the muscle and vertebrae of human waist and back will bear human body top weight Pressure, lumbar muscle strain and vertebrae lesion can if things go on like this occur, bring study, life, the inconvenience in work.

In recent years, in order to provide support force to waist, the seat with waist support just occurs on the market, in pedestal or leans on Back connects waist support, provides good support force to the waist of user, keeps its sitting posture tall and straight, has good protection function to lumbar vertebrae Energy.However, there are waist supports to be bonded untight defect with human body for existing waist bracket chair, i.e., when the sitting posture of user adjusts, Such as leaning forward, waist support flexible with the movement of human body can not often adjust at this time, and can not remain valid is bonded human body supporting waist, The using effect of waist support is more undesirable.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of waist bracket being driven by sprocket wheel Chair.When user is moved forward and backward on the seat, waist support can be close to human waist and back and make synchronizing moving, be bonded in real time to waist, Increase the support force to human body waist position.

The above-mentioned technical purpose of the utility model has the technical scheme that

It is a kind of by sprocket wheel be driven waist bracket chair, include waist support 5, gas spring 12, rotating assembly and transmission parts 40, The rotating assembly includes main shaft 16, and the waist support 5 is that axis is rotated with the main shaft 16, and the rotation is the gas spring The 12 flexible transmission by the transmission parts 40 and realize, the transmission parts 40 include connect with the gas spring 12 Linking arm 41, the sprocket wheel 412 being connected on the linking arm 41, the sprocket wheel connector 413 that is connect with the rotating assembly and Chain 411, the chain 411 engage connection with the sprocket wheel 412, the chain 411 and 413 company of engagement of sprocket wheel connector It connects.

As the preferred of the utility model, described 12 one end of gas spring is connect with the transmission parts 40, the driving section Part 40 is connect with the main shaft 16, and the main shaft 16 connect with the waist support 5 and the waist support 5 is driven to rotate.

In the technical scheme, most important component is the transportable waist support 5, when human body sitting posture changes, Such as human body, when leaning forward, the waist support 5 can also move forward, and simultaneously fit closely, increase to human body close to the back position of human body Support force.And the power of advance with the retrogressing of the waist support 5 is both from the flexible running of the gas spring 12.In this technology In scheme, power part is not using other driving methods but defines the gas spring 12, is because of gas spring 12 Motive force continue and uniformly, the waist support 5 can be enabled to have a uniform and lasting promotion or support force to human body, relax Suitable sense is stronger.And other components such as driving part or elastomeric element, such as spring column, spring, by the image of Hooke's law, The support force of offer and the deformation of itself are positively correlated, and in moving process, can not provide lasting and uniform power.The technical program In, about seat cushion, handrail, the structure of chair leg, shape, connection relationship etc., specific restriction is not done.

Herein, using the stretching direction definition of gas spring 12 as front-rear direction, the stretching direction of gas spring 12 is that is, close Before the direction of human body waist is, after the retracted orientation of the gas spring 12, the i.e. direction far from human body waist are.

The motion profile of the gas spring 12 is straight-line trajectory in the front-back direction, and the motion profile of the waist support 5 It is the arching trajectory rotated with the main shaft 16 for axis, the effect of the transmission parts 40 is exactly to connect the gas spring 12 With the waist support 5, and the straight-line trajectory of the gas spring 12 become the arc rotary motion profile of the waist support 5. In addition, still head forward, is not specifically limited in the technical program forward for the installation direction of the gas spring 12, i.e. tail portion.

The gas spring 12 can be directly mounted at 3 lower section of seat cushion, can also pass through the connecting component of such as bottom plate etc It is assemblied in 3 lower section of seat cushion indirectly, the technical program is with no restrictions.

Use the mode of sprocket wheel chain for a specific embodiment of the transmission parts 40, specifically, the gas bullet Be connected with linking arm 41 on spring 12, be connected to sprocket wheel 412 on the linking arm 41, and the engagement of the chain 411 be connected to it is described On sprocket wheel 412.When the gas spring 12 is stretched out, the chain 411 is pulled along, the other end and the chain of the chain 411 It takes turns connector 413 to bond, the sprocket wheel connector 413 is driven to swing around the main shaft 16.In this manner, it can also incite somebody to action The technical solution that the chain 411 matches the sprocket wheel 412 replaces with the coordinated scheme of common synchronous belt and synchronizing wheel, principle It is identical.

The gas spring 12 is consistent to the principle for when after-contraction, driving the waist support 5 to swing and above, no longer superfluous herein It states.

As an implementation, the transmission parts 40 are directly connected on the main shaft 16, and corresponding, The waist support 5 is also directly connected on the main shaft 16.In this embodiment, the main shaft 16 is rotation, and directly The waist support 5 is driven to be rotated.

As the preferred of the utility model, described 12 one end of gas spring is connect with the transmission parts 40, the driving section Part 40 is connect with rotating connector, and the rotating connector is set on the main shaft 16, the rotating connector and the waist Support 5 connects and the waist support 5 is driven to swing.

As another embodiment, the main shaft 16 is intended only as guiding and position restriction, itself is simultaneously not involved in rotation. It is set on the main shaft 16 equipped with a rotating connector, the rotating connector is the medium as transmission, connection The waist support 5 and the transmission parts 40.The transmission parts 40 drive the rotating connector to rotate, to directly drive The waist support 5 is swung, and the main shaft 16 does not rotate.

As previously mentioned, in present specification, the seat cushion 3 is a upperseat concept, can be the cushion of seat cushion Itself, is also possible to a seat plate, is also possible to the component comprising seat plate below a cushion and cushion, should not be interpreted as seat cushion 3 define a soft cushion.

As the preferred of the utility model, the waist support 5 includes swing arm 52, the supporting plate 51 being flexibly connected with the swing arm 52 With the angle adjustment part for adjusting 51 predetermined angle of supporting plate.

As the preferred of the utility model, the angle adjustment part is torsional spring.

The swing arm 52 can be connected directly or indirectly with the transmission parts 40, and the swing arm 42 participates in swinging, and The supporting plate 51 is connected in the swing arm 52, the supporting plate 51 is flexibly connected with the swing arm 52, i.e., the described supporting plate 51 can be adjusted The whole angle relative to the swing arm 52 so that the supporting plate 51 can more it is flexible more snugly with the small of the back of human body Fitting.

The supporting plate 51 is equipped with torsional spring with 52 junction of swing arm, and there are two aspects for the effect of the torsional spring.First, When human body leans forward or swings back, torsional spring can be supplied to the supporting plate 51 1 suitable torsion and come the angle so that the supporting plate 51 Degree adjustment is more flexible；Second, the angle of the supporting plate 51 can be automatically regulated to be pre- by the torsional spring when human body leaves seat If not tilting in front of angle, such as face, increase aesthetics and uniformity.

As the preferred of the utility model, the waist support 5 is equipped with functional blocks.

As the preferred of the utility model, the functional blocks are magnetic therapy chunking, electric heating chunking or massage chunking.

As the preferred of the utility model, the functional blocks are removably mounted in the waist support 5.

Since the emphasis of the technical program is that the waist support 5 can be close to human waist and back in real time, therefore relaxing in addition to support Adaptive also contains the abutting degree of healthy magnetic therapy.Manufacturer can add each different functional group according to actual business demand Block, such as magnetic therapy, electric heating, massage etc., can also produce multiple functional blocks, using unified connection mounting means, for user Itself selection replacement and installation.

As the preferred of the utility model, also comprising for switching cutting for the 12 adjustment state of gas spring and lock state Change switch block.

The switching switch block is used to switch the state of the gas spring 12.When the gas spring 12 is in adjustment state When, the gas bar of the gas spring 12 can freely stretch out retraction, in this condition, human body layback, the retraction of gas bar, the waist support 5 swing backward；Human body leans forward, and gas bar stretches out, and the waist support 5 is swung forward.When the gas spring 12 is in the lock state, institute The extension elongation for stating gas bar is locked, and the waist support 5 is also fixed, no longer swing.

As the preferred of the utility model, the gas spring 12 is equipped with valve 29, and the switching switch block includes behaviour Workpiece, the drag-line 21 connecting with the operating parts and the pull rod 30 connecting with the drag-line 21, the pull rod 30 withstand the valve Door 29 and the separate valve 29 under the pulling of the drag-line 21.

As the preferred of the utility model, the operating parts includes the ratchet wheel frame 23 with ratchet 24, the ratchet wheel frame 23 It is movably connected with ratchet handle 26 equipped with shaft 22, the ratchet handle 26 is equipped with detent pin 35 and is movably connected with pawl 25, the pawl 25 is corresponding with ratchet 24, and the front of the ratchet handle 26 hooks the tail end of drag-line 21.

As the preferred of the utility model, the ratchet handle 27 of the pawl 25 is worn from the through-hole 28 of ratchet handle 26 Out.

As the preferred of the utility model, the rotating assembly is two, and two rotating assemblies are located at 3 liang of seat cushion Side, the waist support 5 are two, are individually connected on the rotating assembly.

As the preferred of the utility model, the rotating assembly is one, is located at 3 side of seat cushion, and the waist support 5 is one It is a, it is connected on the rotating assembly.

As the preferred of the utility model, including Foot of chair component 1, seat cushion 3, armrest assembly 4 and backrest 5, the handrail 6 top of casing of component 4 is equipped with rocker arm 8, and the front end of the rocker arm 8 is equipped with to ship and resell on another market and 32 be flexibly connected with the rear portion of backrest 5；Institute The fixed bottom plate 13 in lower part of seat cushion 3 is stated, the lower part of the bottom plate 13 is fixedly connected with the top of Foot of chair component 1, the bottom The control cage 31 that rear portion in plate 13 is fixed is connect with the front of gas spring 12, and the tail portion of the gas spring 12 is equipped with connecting pin 33 It is connected to one end of linking arm 1, the other end of the linking arm 1 is equipped with rocking pin 17 and is actively embedded in 6 lower part of casing In swinging chute 18.

As the preferred of the utility model, the inner cavity of described sleeve pipe 6 is equipped with spacer 15, and the inner cavity of the spacer 15 is equipped with master Axis 16, the lower part of the main shaft 16 are equipped with connecting plate 19 and are fixedly connected with bottom plate 13, and handrail 2 is installed on the top of the main shaft 16.

In conclusion the utility model has the following beneficial effects:

1, waist support can be carried out rotation, to adapt to human body sitting posture, timely supporting waist.

2, used gas spring as power part, gas spring persistently can give waist support uniform lasting power, so that waist It is uniformly lasting to the support force of human body to hold in the palm, and increases comfort level.

3, whole design, which can be used, in waist support can also be used two sides separate design.

4, it is just connected between supporting plate and swing arm by torsional spring, back is more bonded, after people leaves waist support, supporting plate energy Face position is kept, is not tilted, aesthetics is promoted.

5, installation function component, the different function such as Lai Shixian magnetic therapy, massage, electric heating be can customize in waist support.

6, the extension elongation of gas spring can be locked.

Detailed description of the invention

Fig. 1 is the main view of embodiment one；

Fig. 2 is the left view of Fig. 1；

Fig. 3 is the top view of Fig. 1；

Fig. 4 is the main view of embodiment two；

Fig. 5 is the left view of Fig. 4；

Fig. 6 is the top view of Fig. 4；

Fig. 7 be I in Fig. 1, Fig. 4 at enlarged drawing；

Fig. 8 be II in Fig. 1, Fig. 4 at enlarged drawing；

Fig. 9 be III in Fig. 2, Fig. 5 at enlarged drawing；

Figure 10 be IV in Fig. 3, Fig. 6 at enlarged drawing；

Figure 11 be V in Fig. 3 at enlarged drawing；

Figure 12 be VI in Fig. 3, Fig. 6 at enlarged drawing；

Figure 13 be VII in Fig. 3, Fig. 6 at enlarged drawing；

Figure 14 be VIII in Fig. 3, Fig. 6 at enlarged drawing；

Figure 15 be Ⅸ in Fig. 6 at enlarged drawing；

Figure 16 is the top view of embodiment three；

Figure 17 is the details enlarged drawing in Figure 16 at A；

Figure 18 is the side sectional view in Figure 16 at B.

Specific embodiment

The utility model is described in further detail below in conjunction with attached drawing.

This specific embodiment is only the explanation to the utility model, is not limitations of the present invention, ability Field technique personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but As long as all by the protection of Patent Law in the scope of the claims of the utility model.

Embodiment 1, as shown in Figure 1, Figure 2, backrest shown in Fig. 3, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11, Figure 12, Figure 13, Figure 14 It can be close to the mobile chair of human waist and back, including Foot of chair component 1, seat cushion 3, armrest assembly 4 and backrest 5, armrest assembly 4 6 top of casing be equipped with rocker arm 8, the front end of rocker arm 8 is equipped with to ship and resell on another market and 32 be flexibly connected with the rear portion of backrest 5；The lower part of seat cushion 3 The lower part of fixed bottom plate 13, bottom plate 13 is fixedly connected with the top of Foot of chair component 1, the fixed control in the rear portion in bottom plate 13 Frame 31 is connect with the front of gas bar 12, and the tail portion of gas bar 12 is equipped with one end that connecting pin 33 is connected to linking arm 1, linking arm one 9 other end is equipped with rocking pin 17 and is actively embedded in the swinging chute 18 of 6 lower part of casing.

Backrest 5 is two pieces of shape structures of separation.

The lower part of headrest 7 is connect with 3 lower part of seat cushion.

In embodiment, the concrete form of Coupling is casing 6, and the inner cavity of casing 6 is equipped with spacer 15, the inner cavity of spacer 15 Equipped with main shaft 16, the lower part of main shaft 16 is equipped with connecting plate 19 and is fixedly connected with bottom plate 13, and handrail 2 is installed on the top of main shaft 16.

Pin 10 is equipped in bottom plate 13, linking arm 1 is equipped with elongated slot 11 in the corresponding position of pin 10, and pin 10 is actively embedding Enter in elongated slot 11.

The side setting of bottom plate 13 has the ratchet wheel frame 23 of ratchet 24, and ratchet wheel frame 23 is equipped with shaft 22 and is movably connected with spine Wheel handle 26, ratchet handle 26 are equipped with detent pin 35 and are movably connected with pawl 25, and pawl 25 is corresponding with ratchet 24, ratchet hand The front of handle 26 hooks the tail end of drag-line 21.

The ratchet handle 27 of pawl 25 is pierced by from the through-hole 28 of ratchet handle 26.

30 lower part of pull rod that 31 activity of control cage is installed with hooks the front end of drag-line 21, the upper middle part of pull rod 30 and gas bar 12 valve 29 is corresponding.

Linking arm 1 and connecting plate 19 are exposed to outer part and wrap up with shield 20.

Embodiment 2, as shown in Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 12, Figure 13, Figure 14, Figure 15, including chair 6 top of casing of sub- foot component 1, seat cushion 3, armrest assembly 4 and backrest 5, armrest assembly 4 is equipped with rocker arm 8, the front end of rocker arm 8 It 32 is flexibly connected with the rear portion of backrest 5 equipped with shipping and reselling on another market；The fixed bottom plate 13 in the lower part of seat cushion 3, the lower part of bottom plate 13 and Foot of chair The top of component 1 is fixedly connected, and the fixed control cage 31 in the rear portion in bottom plate 13 is connect with the front of gas bar 12, the tail of gas bar 12 Portion is equipped with one end that connecting pin 33 is connected to linking arm 1, and the other end of linking arm 1 is equipped with rocking pin 17 and is actively embedded in set In the swinging chute 18 of 6 lower part of pipe.

Backrest 5 is monolith shape structure.

Ship and resell on another market 32 insertion backrest, 5 rear portion backrest elongated slot 34 in be flexibly connected；

The lower part of headrest 7 is connect with backrest 5.

The inner cavity of casing 6 is equipped with spacer 15, and the inner cavity of spacer 15 is equipped with main shaft 16, and the lower part of main shaft 16 is equipped with connecting plate 19 It is fixedly connected with bottom plate 13, handrail 2 is installed on the top of main shaft 16.

The state of pawl 25 and ratchet handle 26 is that backrest 5 is in static state in Fig. 8, when need backrest 5 be close to people When body the small of the back is mobile, rotating ratchet handle 26 is moved along shaft 22 upwards, through-hole 28 drives 27 rearward displacement of ratchet handle, makes Pawl 25 is obtained to engage from the rear portion that the engagement of the front of ratchet 24 is moved to ratchet 24；Drag-line 21 is pulled simultaneously, is drawn by drag-line 21 Dynamic pull rod 30 opens valve 29；Compressed spring stretching, extension in gas bar 12 makes the elongation of bar 12 of bringing about the desired sensation, and is driven and is connected by connecting pin 33 Arm 1 is connect to move forward along elongated slot 11；It is with main shaft 16 by rocking pin 17, the drive of swinging chute 18 casing 6, rocker arm 8 simultaneously Center inwardly rotates forward；Rocker arm 8 is moved forward by 32 drive backrests 5 of shipping and reselling on another market simultaneously is close to human waist and back.When human body to When leaning on afterwards, human waist and back presses backward, and by backrest 5 to pusher, backrest 5 is by ship and resell on another market 32 drive rocker arms 8, casing 6 with main shaft Outside back rotation centered on 16；Simultaneously rocker arm 8 by swinging chute 18, rocking pin 17 drive linking arm 1 along elongated slot 11 to After move；Linking arm 1 makes the shortening of bar 12 of bringing about the desired sensation by the compressed spring in 33 compressed gas bar 12 of connecting pin simultaneously.It is using In the process, when some position if necessary to backrest 5 in entire shift motion stops, move and then put down upwards ratchet handle 27, so that pawl 25 is engaged from the front that the engagement of the rear portion of ratchet 24 is moved to ratchet 24, spine then is put down down along shaft 22 Wheel handle 26, to loosen drag-line 21 and pull rod 30 closes valve 29.Certainly, the utility model backrest can be close to The gas bar 12 of the mobile chair of human waist and back, can be used for example: compressed spring, extension spring, elastic rubber etc. are realized.Make Linking arm 1 is driven to move along elongated slot 11 by connecting pin 33 with elastic construction；Pass through rocking pin 17,18 band of swinging chute simultaneously Dynamic casing 6, rocker arm 8 are rotated centered on main shaft 16；Rocker arm 8 is belonged to by the mobile scheme of 32 drive backrests 5 of shipping and reselling on another market simultaneously The range of the utility model protection.

Embodiment 3, as shown in Figure 16 and Figure 17 and Figure 18, gas spring 12 can be directly mounted at 3 lower section of seat cushion, can also pass through The connecting component of such as bottom plate etc is assemblied in 3 lower section of seat cushion indirectly, and the technical program is with no restrictions.In the present embodiment, it passes Dynamic component 40 is connect comprising the linking arm 41 connecting with gas spring 12, the sprocket wheel 412 being connected on linking arm 41, with rotating assembly Sprocket wheel connector 413 and chain 411, chain 411 engages connection with sprocket wheel 412, and chain 411 is engaged with sprocket wheel connector 413 Connection.

Use the mode of sprocket wheel chain for another specific embodiment of transmission parts 40, specifically, in gas spring 12 Be connected with linking arm 41, be connected to sprocket wheel 412 on linking arm 41, linking arm 41 and sprocket wheel 412 and chain 411 is engaged and is connected to On sprocket wheel 412.When gas spring 12 is stretched out, chain 411 is pulled along, and the other end and sprocket wheel connector 413 of chain 411 bond, Band movable sprocket connector 413 is swung around main shaft 16.In this manner, chain 411 can also be matched to the technology of sprocket wheel 412 Scheme replaces with the coordinated scheme of common synchronous belt and synchronizing wheel, and principle is identical.

In addition, waist support 5 is comprising swing arm 52, the supporting plate 51 being flexibly connected with swing arm 52 and for adjusting 51 predetermined angle of supporting plate Torsional spring.

Swing arm 52 can be with transmission parts 40, i.e., and swing tooth 43 is connected directly or indirectly, and swing arm 52 participates in swinging, and Supporting plate 51 is connected in swing arm 52, supporting plate 51 is flexibly connected with swing arm 52, i.e., supporting plate 51 can adjust the angle relative to swing arm 52, So that supporting plate 51 more flexible more can be snugly bonded with the small of the back of human body.

Supporting plate 51 and 52 junction of swing arm are equipped with torsional spring, and there are two aspects for the effect of torsional spring.First, lean forward in human body or When layback, torsional spring, which can be supplied to supporting plate 51 1 suitable torsion, to be come so that the angle adjustment of supporting plate 51 is more flexible；Second, When human body leaves seat, the angle of supporting plate 51 can be automatically regulated to be in front of predetermined angle, such as face and not tilt by torsional spring, increase Add aesthetics and uniformity.

Waist support 5 is equipped with functional blocks.Functional blocks are magnetic therapy chunking, electric heating chunking or massage chunking.Functional blocks can Disassembly is mounted in waist support 5.Since the emphasis of the technical program is that waist support 5 can be close to human waist and back in real time, therefore in addition to branch The comfort of support also contains the abutting degree of healthy magnetic therapy.Manufacturer can add each different according to actual business demand Functional blocks, such as magnetic therapy, electric heating, massage etc., can also produce multiple functional blocks, using unified connection mounting means, Replacement and installation are selected for user itself.

Also comprising the switching switch block for switching gas spring 12 adjustment state and lock state.Switch switch block to use In the state of switching gas spring 12.When gas spring 12 is in adjustment state, the gas bar of gas spring 12 can freely stretch out retraction, In this condition, human body is swung back, and gas bar retraction, waist support 5 is swung backward；Human body leans forward, and gas bar stretches out, and waist support 5 is swung forward. When gas spring 12 is in the lock state, the extension elongation of gas bar is locked, and waist support 5 is also fixed, no longer front and back rotation.

Claims

1. a kind of waist bracket chair being driven by sprocket wheel, it is characterised in that: include waist support (5), gas spring (12), rotating assembly With transmission parts (40), the rotating assembly includes main shaft (16), and the waist support (5) is that axis is turned with the main shaft (16) Dynamic, the rotation is the flexible transmission by the transmission parts (40) of the gas spring (12) and realizes, the transmission Component (40) includes the linking arm (41) connecting with the gas spring (12), the sprocket wheel being connected on the linking arm (41) (412), the sprocket wheel connector (413) and chain (411) being connect with the rotating assembly, the chain (411) and the sprocket wheel (412) engagement connection, the chain (411) engage connection with the sprocket wheel connector (413).

2. a kind of waist bracket chair being driven by sprocket wheel according to claim 1, it is characterised in that: the gas spring (12) One end is connect with the transmission parts (40), and the transmission parts (40) connect with the main shaft (16), the main shaft (16) with The waist support (5) connects and the waist support (5) is driven to rotate.

3. a kind of waist bracket chair being driven by sprocket wheel according to claim 1, it is characterised in that: the gas spring (12) One end is connect with the transmission parts (40), and the transmission parts (40) connect with rotating connector, the rotating connector set It is located on the main shaft (16), the rotating connector connect with the waist support (5) and the waist support (5) is driven to rotate.

4. a kind of waist bracket chair being driven by sprocket wheel according to claim 1, it is characterised in that: waist support (5) packet Containing swing arm (52), the supporting plate (51) being flexibly connected with the swing arm (52) and angle for adjusting the supporting plate (51) predetermined angle Spend adjustment part.

5. a kind of waist bracket chair being driven by sprocket wheel according to claim 4, it is characterised in that: the angle adjustment part For torsional spring.

6. a kind of waist bracket chair being driven by sprocket wheel according to claim 1, it is characterised in that: on the waist support (5) Equipped with functional blocks.

7. a kind of waist bracket chair being driven by sprocket wheel according to claim 6, it is characterised in that: the functional blocks are Magnetic therapy chunking, electric heating chunking or massage chunking.

8. a kind of waist bracket chair being driven by sprocket wheel according to claim 1, it is characterised in that: also comprising for switching The switching switch block of gas spring (12) the adjustment state and lock state.

9. a kind of waist bracket chair being driven by sprocket wheel according to claim 8, it is characterised in that: the gas spring (12) Be equipped with valve (29), the switching switch block include operating parts, the drag-line (21) that is connect with the operating parts and with it is described The pull rod (30) of drag-line (21) connection, the pull rod (30) withstand the valve (29) and remote under the pulling of the drag-line (21) From the valve (29).