CN209629128U - Lifting device and seat - Google Patents

Abstract

The utility model relates to a kind of lifting device and seats, and chair is arranged in leans on back, including mounting bracket, two connecting rods for connecting backrest and mounting bracket and the locking mechanism for making connecting rod be parked on commitment positions for configuring headrest or Lumbar；Two respective one end of connecting rod and backrest are rotatablely connected, and two connecting rods intermesh with this one end that backrest is rotatablely connected, and the other end of connecting rod is flexibly connected with mounting bracket；During two connecting rods are rotated synchronously around each autorotation point, mounting bracket is lifted or is declined.It is connect by two connecting rods with backrest, the mode of two connecting rod one end gear teeth meshings is engaged, and two connecting rods drive mounting bracket to move up and down around the rotating joint synchronous rotary with backrest；Because connecting rod and backrest are rotation connection, connecting rod and backrest junction engaged position size are limited, and the corresponding position of backrest does not need to combine headrest or the stroke of Lumbar that higher supporter is arranged as previous.

Description

Lifting device and seat

Technical field

The utility model belongs to office chair or the technical field of the seat more particularly to a kind of lifting for office chair or seat Device.

Background technique

With the improvement of living condition, people require office chair comfort higher and higher.Lumbar and headrest, which are used as, to be done The important component of public chair has an important influence on the comfort level of human body.Traditional Lumbar or headrest, is fixed on office chair Corresponding position, lean on rest for human body waist or head and be used.But the Lumbar and headrest of fixed position do not adapt to difference The people of the height bodily form uses.

Conventional way is the supporter that a vertical direction is arranged on office chair backrest currently on the market, on supporter The sliding slot of straight line or camber line, Lumbar or headrest are plugged in sliding slot, and are in sliding fit with the sliding chute.This lifting structure, Lumbar or The height of the lifting of headrest is determined by the sliding length of sliding slot.But in certain space, this design, which exists, to be lacked It falls into, Lumbar or headrest cannot reach required adjustable height；Such as to make the adjustable height long enough of headrest or Lumbar, then It needs to increase the length or height of supporter, but this will affect beauty, is unfavorable for chair and is designed towards the direction of good appearance.

Summary of the invention

In order to solve the above technical problems, the purpose of the utility model is to provide it is a kind of in a limited space or position just The lifting device and seat of Lumbar or headrest lifting can be achieved, which is arranged the lifting travel so that headrest or Lumbar Length is not rely on the height of supporter, and depends on the length of rotational angle or connecting rod, therefore the installation position of lifting device It is relatively limited to set required space, so that installation is more flexible, the direction for being conducive to seat towards contour structures beauty is designed.

In order to achieve the above purpose, the utility model uses technical solution below:

A kind of lifting device, is arranged in the back that leans on of chair, and the lifting device includes for configuring headrest or waist The mounting bracket leaned on, two connecting rods for connecting backrest and mounting bracket and the lock for making connecting rod be parked on commitment positions Determine mechanism；The respective one end of two connecting rods and backrest are rotatablely connected, and this one end of two connecting rods and backrest rotation connection It intermeshes, the other end of connecting rod is flexibly connected with mounting bracket；During two connecting rods are rotated synchronously around each autorotation point, Mounting bracket is lifted or is declined.

The utility model is connect by two connecting rods with backrest, and two respective one end of connecting rod are rotatablely connected with backrest, It realizes that two connecting rods are rotated synchronously by gear teeth occlusion, and then mounting bracket is driven to move up and down；Because connecting rod is with backrest Rotation connection, therefore connecting rod and backrest junction engaged position size are limited, the corresponding position of backrest is not needed as previous one Sample combines headrest or the stroke of Lumbar that higher supporter is arranged, and the direction for being conducive to seat towards contour structures beauty is designed.

Preferably, this end that two connecting rods are respectively connected with backrest is a runner, on the outer peripheral surface of runner Even to be provided with multiple gear teeth, two connecting rods are mutually twisted realization synchronous rotary by the gear teeth.

Preferably, setting in the corresponding position of backrest, there are two shaft, the runner and shaft axial restraints, circumferential direction Rotation connection.This ensure that runner rotates, while runner will not be made to be detached from shaft again.

Preferably, formed in shaft surrounding it is fluted, circumferentially arranged at least two baffles in groove, runner with This opposite one side of groove is equipped with the gear tooth with baffle fit, and gear tooth is inserted into groove, the gear tooth touching in runner rotation It is limited to baffle.By above-mentioned setting, the rotational angle and range of connecting rod are defined.

Preferably, the backrest includes back frame, crosspiece, two respective one end of connecting rod are equipped on back frame It is rotatablely connected with crosspiece, Lumbar is configured in mounting bracket.

Preferably, the back frame includes left and right spaced first frame side, the second frame side and company It is connected to top frame side, the under(-)chassis side of the first, second frame side upper and lower side, the left and right ends of crosspiece are respectively with first, Two frame sides are connected.Backrest uses tower structure, facilitates arrangement screen cloth and lifting device.

Preferably, the height of crosspiece is 2-4cm.The height needed at the rotation connection position of connecting rod and crosspiece is only 2- 4cm will not have an impact appearance without excessively high height.

Preferably, the backrest includes back frame, the back frame includes spaced first frame in left and right Frame side, the second frame side and the top frame side, the under(-)chassis side that are connected to the first, second frame side upper and lower side, two companies The respective one end of bar is directly or indirectly rotatablely connected with top frame side, configured with headrest in mounting bracket.Lifting device may be used also To be arranged at the top of backrest, the lifting as headrest, which supports, to be used.

Preferably, the locking mechanism includes positioning region and resilient clamp member, the positioning region be set to connecting rod with The side of this one end of backrest rotation connection, is equipped with multiple locating slots of arc-shaped arrangement on positioning region, and resilient clamp member is attached In on connecting rod and resilient clamp member is matched with locating slot always, resilient clamp member overcomes when connecting rod rotates under external force Resistance transfers between different locating slots, the locating slot of resilient clamp member and corresponding position clamping lock when connecting rod stops operating It is fixed.

Preferably, the resilient clamp member includes shell, positioning ball and spring；The main body of the shell is in U-shape, Including U-shaped shell surface, the ball baffle of U-shaped shell surface side and the fixed part for being installed to shell on connecting rod, institute are set It states and offers circular hole on ball baffle, the diameter of the circular hole is less than the diameter of positioning ball；The spring-compressed is mounted on outer It is pressed at the circular hole of ball baffle in the U-lag of shell and by positioning ball；During link rotatable, positioning ball stretches out circular hole Position constantly with locating slot contact squeeze, and be stuck in when connecting rod is static in the locating slot of corresponding position and realize determining for connecting rod Position.It reorders the structure of a ball in the spring that is provided on one side of connecting rod, is equipped with corresponding position limiting structure in the corresponding positions of backrest, makes It has the gear of height to adjust in lifting process.

To spring positioning and spring is installed for convenience, preferably, the other side of the U-shaped shell surface is provided with spring The other side of U-shaped shell surface is arranged in mounting post, mounting post, and the spring is threaded through in mounting post.

Preferably, the other end of connecting rod is flexibly connected with mounting bracket and refers to: being provided with waist type in the mounting bracket Slot, the other end of connecting rod are provided with connecting pin, and the connecting pin is threaded through in waist type groove；When link rotatable, connecting pin drives peace Dress bracket moves up and down, while connecting pin slides in waist type groove.Guarantee that connecting rod and mounting bracket connect in link rotatable in this way There is certain free gap at the place of connecing, it is ensured that lifting is smooth.

Preferably, the waist type groove is horizontal kidney slot.One end of two connecting rods is engaged by circular gear Mode presses the center of circle synchronous rotary of gear, and the other end of two connecting rods moves in a circle.So two connecting rods is another Linear distance between end changes, and lateral waist type groove is designed in the Lumbar or head rest being attached thereto.

Alternatively mode is provided with connecting pin in the mounting bracket, and the other end of connecting rod is provided with waist type groove, The connecting pin is threaded through in waist type groove；When link rotatable, connecting pin and mounting bracket is driven to move up and down by waist type groove, together When connecting pin slided in waist type groove.

Mounting bracket is disconnected pin in order to prevent, preferably, the head of connecting pin expands formation for preventing suddenly Itself is detached from the stopper section of waist type groove.

Preferably, the other end of connecting rod is flexibly connected with mounting bracket and refers to: the other end and mounting bracket of connecting rod turn Dynamic connection, connecting rod is telescopic connecting rod.

Preferably, the other end of connecting rod is flexibly connected with mounting bracket and refers to: the other end and mounting bracket of connecting rod turn Dynamic connection, connecting rod are at least two small rod connection compositions, are hinged between the small rod.

Preferably, in mounting bracket be configured with Lumbar, the Lumbar by two pieces of Lumbar board groups at；The mounting bracket Including rack body, the both ends of rack body are symmetrically arranged with a supporter, and Lumbar plate is mounted on supporter, the other end of connecting rod It is movably connected with the support.

Preferably, rack body is in linear type, the supporter is arched, and supporter is under external force extrusion Elastically-deformable elastomer is generated, the both ends of the supporter are fixedly connected with Lumbar plate.In this way Lumbar can produce deformation with It shrinks, waist impression is more comfortable.

Preferably, being provided with grip part at the center of the rack body.By setting rack body and grip part, lead to It crosses the power that up and down direction is applied to grip part and drives link rotatable, to realize the height adjustment of Lumbar or headrest.

Preferably, connecting rod extends away from the direction of backrest by one end of connecting rod to the other end.It may make peace in this way Gap is kept between dress bracket and Lumbar, while being convenient for link rotatable again.

A kind of seat, it is characterized in that: including seat, backrest and lifting device as described above.

Compared with prior art, the utility model has the beneficial effects that

1. being connect by two connecting rods with backrest, the mode of two connecting rod one end gear teeth meshings is engaged, two companies Bar drives mounting bracket to move up and down around the rotating joint synchronous rotary with backrest；Because connecting rod and backrest are rotation Connection, therefore connecting rod and backrest junction engaged position size are limited, the corresponding position of backrest does not need to tie as previous Higher supporter is arranged in syncephalon pillow or the stroke of Lumbar, and the direction for being conducive to seat towards contour structures beauty is designed.

2. compared with prior art, can be real in narrow space using the technical solution of the utility model Now to the demand of the adjustable height of Lumbar or headrest, which is determined by the diameter of two runners, as long as the power of runner occlusion Reach required requirement, runner diameter can be made small.

3. the spring that is provided on one side in connecting rod is reordered the structure of a ball, corresponding limit is equipped in the corresponding positions of backrest Bit architecture makes it have the adjusting of the gear of height in lifting process.

4. one end of two connecting rods is the center of circle synchronous rotary in such a way that runner is engaged by runner, two connecting rods The other end move in a circle.So the linear distance between the other end of two connecting rods changes, it is attached thereto Lumbar or head rest design have a waist type groove being laterally arranged, guarantee connecting rod and mounting bracket junction in link rotatable in this way There is certain free gap, it is ensured that lifting is smooth.

Detailed description of the invention

Fig. 1 is the explosive view of the lifting device of the utility model and backrest cooperation in embodiment 1.

Fig. 2 is the Structure explosion diagram of connecting rod and locking mechanism.

Fig. 3 is the structural schematic diagram of resilient clamp member shell.

Fig. 4 is the lifting device of the utility model and the status diagram one (Lumbar initial position) of backrest cooperation.

Fig. 5 is the lifting device of the utility model and the status diagram two of backrest cooperation (Lumbar is in upper end).

Fig. 6 is the lifting device of the utility model and the status diagram three of backrest cooperation (Lumbar is in lower end).

Fig. 7 is the cooperation schematic diagram one of connecting rod, locking mechanism and backrest.

Fig. 8 is the cooperation schematic diagram two of connecting rod, locking mechanism and backrest.

Fig. 9 is the cooperation schematic diagram three of connecting rod, locking mechanism and backrest.

Figure 10 is the cooperation schematic diagram four of connecting rod, locking mechanism and backrest.

Figure 11 is the cooperation schematic diagram one of connecting rod, locking mechanism, mounting bracket and backrest.

Figure 12 is three-dimensional cooperation schematic diagram two of connecting rod, locking mechanism, mounting bracket and backrest (Lumbar is in upper end).

Figure 13 is three-dimensional cooperation schematic diagram three of connecting rod, locking mechanism, mounting bracket and backrest (Lumbar is in lower end)；

Figure 14 is the mated condition schematic diagram of lifting device and backrest in embodiment 2.

Specific embodiment

In order to be more clearly understood that the above objects, features, and advantages of the utility model, with reference to the accompanying drawing and have The utility model is further described in detail in body embodiment.It should be noted that in the absence of conflict, this Shen The feature in embodiment and embodiment please can be combined with each other.

Many details are explained in the following description in order to fully understand the utility model, still, this is practical Novel to be implemented using other than the one described here other modes, therefore, the protection scope of the utility model is simultaneously It is not limited by the specific embodiments disclosed below.

It is to go up and down dress the utility model relates to the reference azimuth of each component, such as left and right, upper and lower, side, side etc. It sets, backrest and seat describe under normal operating condition.It is to be appreciated that term " on ", "lower", " side ", " side " The orientation or positional relationship of equal instructions is to be based on the orientation or positional relationship shown in the drawings, and being merely for convenience of description, this is practical new Type and simplified description, rather than the lifting device or backrest of indication or suggestion meaning must have specific direction, with specific Orientation construction and operation, it is thus impossible to be construed as a limitation of the present invention.

Term " first ", " second " etc. are only used for the purpose of description in the description of the present invention, and should not be understood as Indication or suggestion relative importance.

The terms such as term " installation ", " connected ", " connection ", " fixation ", " support " shall be understood in a broad sense, for example, " even Connect " it may be fixed connection or may be dismantle connection, or integral connection；" connected " can be directly connected, can also be with Indirectly connected through an intermediary；It for the ordinary skill in the art, can be as the case may be or originally practical Novel specific explanations understand the concrete meaning of above-mentioned term in the present invention.

In the description of this specification, the description of term " specific embodiment " etc. means that the embodiment or example is combined to describe Particular features, structures, materials, or characteristics be contained at least one embodiment or example of the utility model.In this specification In, schematic expression of the above terms are not necessarily referring to identical embodiment or example.Moreover, the specific features of description, Structure, material or feature can be combined in any suitable manner in any one or more of the embodiments or examples.

Specific embodiment of the present utility model is made a detailed explanation with reference to the accompanying drawing.

Embodiment 1:

As Fig. 1~Figure 13 illustrates a kind of lifting device and the back of the lifting device is arranged.

In the present embodiment, the lifting device includes for configuring the mounting bracket 3 of Lumbar 2, for connecting backrest With two connecting rods 4 of mounting bracket 3 and for making connecting rod 4 be parked on the locking mechanism 5 of commitment positions；Two connecting rods 4 Respective one end and backrest are rotatablely connected, and this one end that two connecting rods 4 are rotatablely connected with backrest is intermeshed, connecting rod 4 it is another One end is flexibly connected with mounting bracket 3；During two connecting rods 4 are rotated synchronously around each autorotation point, mounting bracket 3 is lifted Or decline.

In the present embodiment, as shown in Figure 1, the backrest includes the back frame 1 of configurable screen cloth, the seat back frame Frame 1 is including spaced first frame in left and right side 62, the second frame side 63 and is connected to the first, second frame side 62,63 Top frame side 64, the under(-)chassis side 65 of upper and lower side are equipped with crosspiece between the middle and lower part of the first, second frame side 62,63 6, crosspiece 6 is arc-shaped, and the height of crosspiece 6 is 2-4cm, the left and right ends of crosspiece 6 respectively with the first, second frame side 62,63 phases Even, it is rotatablely connected in the middle part of two respective one end of connecting rod 4 and crosspiece 6.

Specifically, the middle part of crosspiece 6 offers groove body 61 along its length, at the center of groove body 61 there are two settings Shaft 12, the shaft are screw hole column.This end that two connecting rods 4 are respectively connected with the crosspiece of backrest 6 is a runner 43, is being turned Multiple gear teeth 42 are evenly arranged on the outer peripheral surface of wheel 43, two connecting rods 4 are mutually twisted realization synchronous rotary by the gear teeth 42.By This end that connecting rod 4 is connected with crosspiece 6 to the other end, connecting rod 4 extends away from the direction of crosspiece 6.

The runner 43 and 12 axial restraint of shaft are circumferentially rotated and are connect, and specifically, are formed in 12 surrounding of shaft Baffle ring 66 forms groove 13 between baffle ring 66 and shaft 12, circumferentially arranged at least two baffles 131 in groove 13, such as scheme Shown in 11, the gear tooth 132 cooperated with baffle 131 is equipped in this one side opposite with groove 13 of runner 43；The wheel face of runner 43 Place offers blind hole 44, and through-hole 45 is offered at the center of blind hole 44；After the through-hole 45 of 4 one end of connecting rod passes through shaft 12, turn The wheel face of wheel 43 fits with baffle ring 66, and keeps off tooth 132 and be then inserted into groove 13, and the runner 43 of two connecting rods 4 is mutual Engagement.At this point, cooperated by gasket inbuilt in blind hole 44 and self-tapping screw 46 and shaft 12 so that connecting rod 4 in the axial direction by It is fixed, it can be rotated in the circumferential, and the runner 43 of two connecting rods is intermeshed always to guarantee two connecting rods during rotation Move synchronously；The touching of tooth 132 to baffle 131 is kept off when runner 12 turns to predetermined angle simultaneously to be limited.

Lumbar 2 is configured in mounting bracket 3, Lumbar 2 can be a monolith and be mounted in mounting bracket 3, and with installation branch The activity of frame and move up and down.In the present embodiment, the Lumbar 2 is made of two blocks of Lumbar plates 21；Lumbar plate 21 is nylon Or rubber material is made, and can produce elastic deformation under external force, so that human body sensory is more comfortable；Furthermore because of human body Waist also divides the left and right sides, and the form of the two Lumbar plates 21 in left and right is more advantageous to the fitting with human body waist more closely, comfortably Feel stronger.

The mounting bracket 3 includes rack body 32, and the both ends of rack body 32 are symmetrically arranged with a supporter 31, Lumbar plate 21 are mounted on supporter 31, and the other end of connecting rod 4 is flexibly connected with supporter 31；Rack body 32 is in linear type, bracket sheet Upper end is formed with grip part 321 at the center of body 32；The supporter 31 is connected to below 32 end of rack body, supporter 31 It is arched, and supporter 31 is to generate elastically-deformable elastomer under external force extrusion, the both ends of the supporter 31 with Lumbar plate is fixedly connected；Specifically, slightly locate (that is, at end positions) in the bow of supporter 31 and offer location hole 312, it is fixed Position hole 312 is screw hole, is correspondingly provided with mounting hole 211 on Lumbar plate 21 and passes through screw after mounting hole 211 is aligned with location hole 312 Locking.

In the present embodiment, the other end of connecting rod 4 is flexibly connected with mounting bracket 3 and refers to: being arranged in the mounting bracket 3 Have the waist type groove 311 of horizontal direction, specifically, the setting of waist type groove 311 in 31 center position of supporter, connecting rod 4 it is another End is provided with connecting pin 41, and the connecting pin 41 is threaded through in waist type groove 311；As shown in Figure 8,9, 10, the head of connecting pin 41 Suddenly expand the stopper section 411 formed for preventing itself to be detached from waist type groove 311, equally, stopper section 411 or waist type groove 311 have It is flexible.When installation, the waist type groove 311 of mounting bracket 3 is aligned at the connecting pin 41 of connecting rod 4 and is inserted into, stopper section 411 or waist type Slot 311 deforms so that stopper section 411 penetrates waist type groove 311；Equally, alternatively form, as shown in Fig. 1,2,4,5,6, Connecting pin 41 is equipped with threaded hole 412 and is equally fixed by self-tapping screw after connecting pin 41 is inserted into waist type groove 311, so that even Relative motion between outbound 41 and mounting bracket 3 only has sliding of the connecting pin 41 in waist type groove 311.

As shown in figure 4, connecting rod 4 is in horizontality under the action of locking mechanism 5 when original state connecting rod 4 does not rotate, Crosspiece 6 is in the middle position of 21 up and down direction of Lumbar plate；As shown in Figure 5,6, when connecting rod 4 rotates, connecting pin 41 drives installation Bracket 3 moves up and down, while connecting pin 41 slides in waist type groove 311.

As shown in Fig. 1,2,3,10,11, locking mechanism is symmetrically arranged two groups, every group of locking mechanism and a connecting rod 4 Configuration；Specifically, the locking mechanism 5 includes positioning region 51 and resilient clamp member 52,51 company of being set to of positioning region The side of this one end that bar 4 and crosspiece 6 are rotatablely connected, specifically, positioning region 51 is the side wall of groove body 61, on positioning region 51 Multiple locating slots 511 equipped with arc-shaped arrangement, resilient clamp member 52 is attached on connecting rod 4 and resilient clamp member 52 is always and fixed Position slot 511 match, when connecting rod 4 rotates under external force resilient clamp member 52 overcome resistance different locating slots 511 it Between transfer, 511 snap lock of locating slot of resilient clamp member 52 and corresponding position when connecting rod 4 stops operating.

Resilient clamp member 52 includes shell 521, positioning ball 522 and spring 523.The main body of shell 521 is in U-shape, packet It includes U-shaped shell surface 5211, the ball baffle 5212 of 5211 side of U-shaped shell surface is set and for shell 521 to be installed to connecting rod 4 On fixed part 5213, fixed part 5213 be arranged in 5212 side of ball baffle.Circular hole 5214 is offered on ball baffle 5212, The diameter of the circular hole 5214 is slightly less than the diameter of positioning ball 522, to guarantee that positioning ball 522 will not take off from circular hole 5214 Out.Spring 523 compresses the circular hole that ball baffle 5212 is pressed in the U-lag 5215 for being mounted on shell 521 and by positioning ball 522 It is stretched out outside circular hole 5214 at 5214 to positioning 522 part of ball.

The runner 43 of connecting rod 4, thickness is greater than the thickness of 4 shaft of connecting rod, as shown in figure 11, in runner 43 and 4 shaft of connecting rod Junction is provided with the mounting post 15 of spring 523.When installation, by the U-lag 5215 open-mouth one side alignment connecting rod 4 of shell 521 Shaft, by adjusting that spring 523 will be made to be threaded through in mounting post 15 and spring is in compressive state, the bullet of compressive state Spring presses to ball 522 is positioned at the circular hole of ball baffle 5212, at this time by screw and 4 shaft of connecting rod and fixed part 5213 it Between cooperation complete resilient clamp member 52 installation.And after the wheel face 431 and baffle ring 66 of runner 43 towards baffle ring 66 fit, it is fixed Position ball 522 is also caught in locating slot 511 just.

After connecting rod 4 is installed on crosspiece 6, in two 4 rotary courses of connecting rod, connecting pin 41 is sliding in waist type groove 311 It is dynamic, and mounting bracket 3 is lifted or is declined.Meanwhile the position for positioning the stretching circular hole 5214 of ball 522 overcomes resistance different It is transferred between locating slot 511.When connecting rod 4 stops operating, positioning ball 522 stretches out the position and corresponding position of circular hole 5214 The positioning of connecting rod 4 is realized in 511 extrusion fit of locating slot.

The present embodiment provides a kind of seat, including seat (not shown), backrest and lifting dress as described above in turn It sets.

Embodiment 2: the present embodiment the difference from embodiment 1 is that: as shown in figure 14, the backrest includes back frame 1, The back frame 1 includes spaced first frame in left and right side 62, the second frame side 63 and is connected to first, second Frame side 62, the top frame side 64 of 63 upper and lower sides, under(-)chassis side (not shown), two respective one end of connecting rod 4 directly or It is rotatablely connected indirectly with top frame side 64, is the back side that 4 one end of connecting rod is connected to top frame side 64 specifically, installation Configured with headrest 71 on bracket 3.

Above content is only illustrate to examples for clearly illustrating the present invention described in this specification.The utility model Person of ordinary skill in the field can make various modifications or additions to the described embodiments or using class As mode substitute, content without departing from the utility model specification or surmount model defined in the claims It encloses, all should belong to the protection range of the utility model.

Claims (21)

1. a kind of lifting device, chair is arranged in leans on back, it is characterised in that: the lifting device includes for configuring It headrest (71) or the mounting bracket (3) of Lumbar (2), two connecting rods (4) for connecting backrest and mounting bracket (3) and is used for Connecting rod (4) is set to be parked on the locking mechanism (5) of commitment positions；The respective one end of two connecting rods (4) and backrest are rotatablely connected, And this one end that two connecting rods (4) are rotatablely connected with backrest is intermeshed, the other end of connecting rod (4) and mounting bracket (3) activity Connection；During two connecting rods (4) rotate synchronously around each autorotation point, mounting bracket (3) are lifted or are declined.

2. a kind of lifting device according to claim 1, it is characterised in that: two connecting rods (4) respectively with backrest phase This end even is a runner (43), is evenly arranged on the outer peripheral surface of runner (43) multiple gear teeth (42), and two connecting rods (4) are logical It crosses the gear teeth (42) and is mutually twisted realization synchronous rotary.

3. a kind of lifting device according to claim 2, it is characterised in that: turn there are two being set in the corresponding position of backrest Axis (12), the runner (43) and shaft (12) axial restraint are circumferentially rotated and are connect.

4. a kind of lifting device according to claim 3, it is characterised in that: formed in shaft (12) surrounding fluted (13), circumferentially arranged at least two baffles (131) in groove (13), in this opposite one side of runner (43) and groove (13) It is equipped with the gear tooth (132) cooperated with baffle (131), gear tooth (132) is inserted into groove (13), is kept off when runner (43) rotate Tooth (132) touching to baffle (131) is limited.

5. a kind of lifting device according to claim 1, it is characterised in that: the backrest includes back frame (1), is being leaned on Back frame frame (1) is equipped with crosspiece (6), and two respective one end of connecting rod (4) and crosspiece (6) are rotatablely connected, and mounting bracket is matched on (3) It is equipped with Lumbar (2).

6. a kind of lifting device according to claim 5, it is characterised in that: the back frame (1) includes between left and right Every the first frame side of setting, the second frame side and the top frame side, the bottom that are connected to the first, second frame side upper and lower side Frame side, the left and right ends of crosspiece (6) are connected with the first, second frame side respectively.

7. a kind of lifting device according to claim 1 or 6, it is characterised in that: the height of crosspiece (6) is 2-4cm.

8. a kind of lifting device according to claim 1, it is characterised in that: the backrest includes back frame (1), described Back frame (1) include left and right spaced first frame side, the second frame side and be connected to the first, second frame side Top frame side, the under(-)chassis side of upper and lower side, two respective one end of connecting rod (4) are directly or indirectly rotated with top frame side It connects, configured with headrest in mounting bracket (3).

9. a kind of lifting device according to claim 1, it is characterised in that: the locking mechanism (5) includes positioning region (51) with resilient clamp member (52), the positioning region is set to the side of this one end of connecting rod (4) and backrest rotation connection, In Positioning region is equipped with multiple locating slots (511) of arc-shaped arrangement, and resilient clamp member (52) is attached on connecting rod (4) and elastic card Fitting (52) is matched with locating slot (511) always, and resilient clamp member (52) overcomes resistance when connecting rod (4) rotates under external force Power transfers between different locating slots (511), the positioning of resilient clamp member (52) and corresponding position when connecting rod (4) stops operating Slot (511) snap lock.

10. a kind of lifting device according to claim 9, it is characterised in that: the resilient clamp member (52) includes shell (521), ball (522) and spring (523) are positioned；The main body of the shell (521) is in U-shape, including U-shaped shell surface (5211), It is arranged in the ball baffle (5212) of U-shaped shell surface (5211) side and for shell (521) to be installed to consolidating on connecting rod (4) Determine portion (5213), offered circular hole (5214) on the ball baffle (5212), the diameter of the circular hole (5214) is less than positioning The diameter of ball (522)；Spring (523) compression is mounted in the U-lag (5215) of shell (521) and will position ball (522) it presses at the circular hole (5214) of ball baffle (5212)；In connecting rod (4) rotation process, circle is stretched out in positioning ball (522) The position in hole (5214) constantly with locating slot (511) contact squeeze, and is stuck in when connecting rod (4) is static the locating slot of corresponding position (511) positioning of connecting rod (4) is realized in.

11. a kind of lifting device according to claim 10, it is characterised in that: be additionally provided on connecting rod (4) for solid Determine the mounting post (15) of spring (523), mounting post (15) is arranged in the other side of U-shaped shell surface (5211), and the spring (523) is worn It is located on mounting post (15).

12. a kind of lifting device according to claim 1, it is characterised in that: the other end and mounting bracket of connecting rod (4) (3) it is flexibly connected and refers to: being provided with waist type groove (311) on the mounting bracket (3), the other end of connecting rod (4) is provided with connection It sells (41), the connecting pin (41) is threaded through in waist type groove (311)；When connecting rod (4) rotates, connecting pin (41) drives mounting bracket (3) it moves up and down, while connecting pin (41) sliding in waist type groove (311).

13. a kind of lifting device according to claim 1, it is characterised in that: the other end and mounting bracket of connecting rod (4) (3) it is flexibly connected and refers to: being provided with connecting pin (41) on the mounting bracket (3), the other end of connecting rod (4) is provided with waist type groove (311), the connecting pin (41) is threaded through in waist type groove (311)；When connecting rod (4) rotates, is driven and connected by waist type groove (311) Pin (41) and mounting bracket (3) move up and down, while connecting pin (41) sliding in waist type groove (311).

14. a kind of lifting device according to claim 12 or 13, it is characterised in that: the head of connecting pin (41) is expanded suddenly The big stopper section formed for preventing itself to be detached from waist type groove (311).

15. a kind of lifting device according to claim 1, it is characterised in that: the other end and mounting bracket of connecting rod (4) (3) be flexibly connected and refer to: the other end of connecting rod (4) and mounting bracket (3) are rotatablely connected, and connecting rod (4) is telescopic connecting rod.

16. a kind of lifting device according to claim 1, it is characterised in that: the other end and mounting bracket of connecting rod (4) (3) be flexibly connected and refer to: the other end of connecting rod (4) and mounting bracket (3) are rotatablely connected, and connecting rod (4) is at least two small rods Connection forms, and is hinged between the small rod.

17. a kind of lifting device according to claim 1, it is characterised in that: Lumbar (2) are configured in mounting bracket (3), The Lumbar (2) by two pieces of Lumbar board groups at；The mounting bracket (3) includes rack body (32), rack body (32) Both ends are symmetrically arranged with a supporter (31), and Lumbar plate is mounted on supporter (31), the other end of connecting rod (4) and supporter (31) It is flexibly connected.

18. a kind of lifting device according to claim 17, it is characterised in that: rack body (32) is in linear type, described Supporter (31) is arched, and supporter (31) is that elastically-deformable elastomer, the support are generated under external force extrusion The both ends of body (31) are fixedly connected with Lumbar plate.

19. a kind of lifting device according to claim 17, it is characterised in that: shape at the center of the rack body (32) At there is grip part (321).

20. a kind of lifting device according to claim 1, it is characterised in that: by one end to the other end, the connecting rod court of connecting rod Far from backrest direction extend.

21. a kind of seat, it is characterized in that: including seat, backrest and such as described in any item lifting devices of claim 1-20.