CN208658356U

CN208658356U - A kind of waist bracket chair by rack-driving

Info

Publication number: CN208658356U
Application number: CN201721788891.7U
Authority: CN
Inventors: 欧亚平; 吴青松
Original assignee: 欧亚平; 吴青松
Current assignee: ANJI SHENGXIN OFFICE FURNITURE Co.,Ltd.
Priority date: 2017-12-20
Filing date: 2017-12-20
Publication date: 2019-03-29
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 by rack-driving.The utility model, which relates to, has the technical scheme that a kind of waist bracket chair by rack-driving, 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, the transmission parts include linking arm connect with described gas spring one end, the connection rack gear that is connected on the linking arm and connect with the rotating assembly and with the swing tooth for connecting rack gear and engaging.The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of waist bracket chair by rack-driving.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 by rack-driving

Technical field

The utility model relates to seat design manufacturing fields, and in particular to a kind of waist bracket chair by rack-driving.

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 by rack-driving 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

A kind of waist bracket chair by rack-driving, include waist support, gas spring, rotating assembly and transmission parts, described turn Shaft assembly includes main shaft, and the waist support is rotated using the main shaft as axis, and the rotation is the flexible process of the gas spring The transmission of the transmission parts and realize, the transmission parts include connect with described gas spring one end linking arm, connect Connection rack gear on the linking arm and the swing tooth for connecting with the rotating assembly and being engaged with the connection rack gear.

In the technical scheme, most important component is the transportable waist support, when human body sitting posture changes, example When leaning forward such as human body, the waist support can also be moved forward, and the back position of close human body simultaneously fits closely, and increase the branch to human body Support force.And the power of advance with the retrogressing of the waist support is both from the flexible running of the gas spring.In the technical scheme, Power part is not using other driving methods but defines the gas spring, is because the motive force of gas spring continues And uniformly, the waist support can be enabled to have a uniform and lasting promotion or support force, comfort stronger human body.And its The components such as his driving part or elastomeric element, such as spring column, spring, by the image of Hooke's law, the support force provided Deformation with itself is positively correlated, and in moving process, can not provide lasting and uniform power.In the technical program, about seat cushion, Handrail, the structure of chair leg, shape, connection relationship etc., do not do specific restriction.

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

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

As the preferred of the utility model, the gas spring is mounted below seat cushion, and the linking arm is slidably connected at institute It states below seat cushion, the linking arm is equipped with elongated slot, and the extending direction of the elongated slot is parallel with the telescopic direction of the gas spring, Also comprising connect with the seat cushion and the pin of the activity insertion elongated slot.

The gas spring can be directly mounted at below the seat cushion, can also be indirect by the connecting component of such as bottom plate etc It is assemblied in below the seat cushion, the technical program is with no restrictions.Realize that transmission is the transmission parts by rack-and-pinion A kind of way of realization drives the linking arm to push ahead specifically, the gas spring stretches, and the end of the linking arm connects Then the connection rack gear drives the connection rack gear to push ahead, and the tooth that swings drives in the advance of the connection rack gear Lower natural rotation drives the swing of the waist support.

Just as described above, the swing tooth realizes that the swing of the waist support can be directly connected to and be indirectly connected with two Kind mode.In the technical solution being directly connected to, the swing tooth is directly connect with the main shaft, and the waist support is also directly and institute Main shaft connection is stated, the main shaft participates in rotation.In the technical solution being indirectly connected with, described there are a rotation connections Part, the swing tooth and the waist support are all connected on the rotating connector, and the main shaft is not involved in rotation.

The fluting direction of the elongated slot is also front-rear direction, and the pin, which can be directly connected to seat cushion, can be connected to such as bottom On the fixing piece of plate etc, the cooperation of the pin and the elongated slot can also increase the linking arm and push by the gas spring When advance guiding performance and stability.

The gas spring is consistent to the principle for when after-contraction, driving the waist support to swing and above, and details are not described herein again.

As the preferred of the utility model, described gas spring one end is connect with the transmission parts, the transmission parts with The main shaft connection, the main shaft connect with the waist support and the waist support are driven to rotate.

As an implementation, the transmission parts are directly connected on the main shaft, and corresponding, described Waist support is also directly connected on the main shaft.In this embodiment, the main shaft is rotation, and directly drives the waist Support is rotated.

As the preferred of the utility model, described gas spring one end is connect with the transmission parts, the transmission parts with Rotating connector connection, the rotating connector is set on the main shaft, the rotating connector connect with the waist support and The waist support is driven to swing.

As another embodiment, the main shaft is intended only as guiding and position restriction, itself is simultaneously not involved in rotation.If There is the rotating connector to be set on the main shaft, the rotating connector is to be connected to institute as the medium of transmission State waist support and the transmission parts.The transmission parts drive the rotating connector rotation, to directly drive the waist support It swings, the main shaft does not rotate.

As previously mentioned, in present specification, the seat cushion is a upperseat concept, can be the cushion sheet of seat cushion Body 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 limit A soft cushion is determined.

As the preferred of the utility model, the waist support includes swing arm, the supporting plate being flexibly connected with the swing arm and is used for Adjust the angle adjustment part of the supporting plate predetermined angle.

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

The swing arm can be connected directly or indirectly with the transmission parts, and the swing arm participates in swinging, and described The supporting plate is connected in swing arm, the supporting plate is flexibly connected with the swing arm, i.e., the described supporting plate can be adjusted relative to the swing arm Angle so that the supporting plate more flexible more can be snugly bonded with the small of the back of human body.

The supporting plate and the swing arm junction are equipped with torsional spring, and there are two aspects for the effect of the torsional spring.First, in human body When leaning forward or swinging back, torsional spring, which can be supplied to the supporting plate one suitable torsion, to be come so that the angle of the supporting plate adjusts more It is flexible；Second, the angle of the supporting plate can be automatically regulated to be predetermined angle, example by the torsional spring when human body leaves seat If do not tilted in front of face, increase aesthetics and uniformity.

As the preferred of the utility model, the waist support 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.

It is comfortable since the emphasis of the technical program is that the waist support can be close to human waist and back in real time, therefore in addition to support Property, also contain 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 the switching for switching gas spring the adjustment state and lock state Switch block.

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

As the preferred of the utility model, the gas spring be equipped with valve, the switching switch block comprising operating parts, The drag-line connecting with the operating parts and the pull rod connecting with the drag-line, the pull rod withstand the valve and in the drag-lines Pulling under far from the valve.

As the preferred of the utility model, the operating parts includes the ratchet wheel frame with ratchet, and the ratchet wheel frame, which is equipped with, to be turned Axis is movably connected with ratchet handle, and the ratchet handle is equipped with detent pin and is movably connected with pawl, the pawl and ratchet Corresponding, the front of the ratchet handle hooks the tail end of drag-line.

As the preferred of the utility model, the ratchet handle of the pawl is pierced by from the through-hole of ratchet handle.

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

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

As the preferred of the utility model, including Foot of chair component, seat cushion, armrest assembly and backrest, the armrest assembly Casing top be equipped with rocker arm, the front end of the rocker arm is equipped with to ship and resell on another market and be flexibly connected with the rear portion of backrest；Under the seat cushion The lower part of the fixed bottom plate in portion, the bottom plate is fixedly connected with the top of Foot of chair component, what the rear portion in the bottom plate was fixed The connection of the front of control cage and gas spring, the tail portion of the gas spring is equipped with one end that connecting pin is connected to linking arm one, described The other end of linking arm one is equipped with rocking pin and is actively embedded in the swinging chute of casing part.

As the preferred of the utility model, the inner cavity of described sleeve pipe is equipped with spacer, and the inner cavity of the spacer is equipped with main shaft, institute The lower part for stating main shaft is equipped with connecting plate and is fixedly connected with bottom plate, and handrail is installed on the top of the main shaft.

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.

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, gas spring 12 can be directly mounted at 3 lower section of seat cushion, can also pass through such as bottom The connecting component of plate etc is assemblied in 3 lower section of seat cushion indirectly, and the technical program is with no restrictions.Transmission is realized by rack-and-pinion It is a kind of way of realization of transmission parts 40, specifically, gas spring 12 stretches, drives linking arm 41 to push ahead, linking arm 41 End be connected to connection rack gear 42, drive connection rack gear 42 push ahead, swing tooth 43 connection rack gear 42 advance drive Lower natural rotation drives the swing of waist support 5.The fluting direction of elongated slot 11 is also front-rear direction, and pin 10 can be directly connected to seat cushion 3 It can be connected on the fixing piece of such as bottom plate etc, the cooperation of pin 10 and elongated slot 11 can also increase linking arm 41 by gas bullet The guiding performance and stability of advance when spring 12 pushes.

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 swing.

Claims

1. a kind of waist bracket chair by rack-driving, it is characterised in that: comprising waist support (5), gas spring (12), rotating assembly and Transmission parts (40), the rotating assembly include main shaft (16), and the waist support (5) is that axis is rotated with the main shaft (16), The rotation is the flexible transmission by the transmission parts (40) of the gas spring (12) and realizes, the transmission parts (40) comprising the linking arm (41) being connect with the gas spring (12) one end, the connection rack gear being connected on the linking arm (41) (42) and with the rotating assembly swing tooth (43) for connecting and being engaged with connection rack gear (42).

2. a kind of waist bracket chair by rack-driving according to claim 1, it is characterised in that: the gas spring (12) It is mounted below seat cushion (3), the linking arm (41) is slidably connected at below the seat cushion (3), sets on the linking arm (41) Have elongated slot (11), the extending direction of the elongated slot (11) is parallel with the telescopic direction of the gas spring (12), also comprising with it is described Seat cushion (3) connection and activity are embedded in the pin (10) of the elongated slot (11).

3. a kind of waist bracket chair by rack-driving according to claim 1 or 2, 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) it is connect with the waist support (5) and the waist support (5) is driven to rotate.

4. a kind of waist bracket chair by rack-driving according to claim 1 or 2, 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 rotation connection Part is set on the main shaft (16), and the rotating connector connect with the waist support (5) and the waist support (5) is driven to rotate.

5. a kind of waist bracket chair by rack-driving according to claim 1 or 2, it is characterised in that: the waist support (5) Comprising swing arm (52), the supporting plate (51) being flexibly connected with the swing arm (52) and for adjusting the supporting plate (51) predetermined angle Angle adjustment part.

6. a kind of waist bracket chair by rack-driving according to claim 5, it is characterised in that: the angle adjustment part For torsional spring.

7. a kind of waist bracket chair by rack-driving according to claim 1 or 2, it is characterised in that: the waist support (5) It is equipped with functional blocks.

8. a kind of waist bracket chair by rack-driving according to claim 7, it is characterised in that: the functional blocks are Magnetic therapy chunking, electric heating chunking or massage chunking.

9. a kind of waist bracket chair by rack-driving according to claim 1 or 2, it is characterised in that: also comprising being used for Switch the switching switch block of the gas spring (12) adjustment state and lock state.

10. a kind of waist bracket chair by rack-driving according to claim 9, it is characterised in that: the gas spring (12) valve (29) are equipped with, the switching switch block include operating parts, the drag-line (21) that is connect with the operating parts and with The pull rod (30) of drag-line (21) connection, the pull rod (30) withstand the valve (29) and the pulling in the drag-line (21) Lower separate the valve (29).