CN209135618U - A kind of the rotation splitlevel desktop unfolding mechanism and double layered table top of changeable table - Google Patents

Abstract

The utility model discloses the rotation splitlevel desktop unfolding mechanisms and double layered table top of a kind of changeable table, including the turntable that is arranged in A plane and fan board group, rotates the turntable and to be arranged at least two crank groups on turntable and push out and the fan board group of crank group end is set forms an annular tabletop；The crank group includes the upper crank for being hinged on one side of turntable and the lower crank for being hinged on another side, and the fan board group includes that hinged male fan and the mother hinged with lower crank fan with upper crank；Board group is fanned when expansion and is slid in and out by crank group promotion along straight line, and fan board group is unfolded outward from two layers of stacked state and female fan decline is parallel with male fan and is finally spliced into an annular tabletop.The utility model is compact-sized, by female fan of turntable structure and splitlevel and male fan can quick-expansion deform, to achieve the effect that storage and increase desktop area.

Description

A kind of the rotation splitlevel desktop unfolding mechanism and double layered table top of changeable table

Technical field

The utility model belongs to technical field of furniture, and in particular to a kind of rotating mechanism that can be rotated Deforming table.

Background technique

Furniture is deformed, as its name suggests, the furniture that can be deformed refers to that a furniture can be according to reality in appearance, function Demand and change.It has overturned the single-function of antique traditional furniture, by changing inside of furniture structure, makes the same furniture Can flexibly it change between multiple functions, i.e. a furniture is provided simultaneously with two or more kinds of household functions, realizes furniture Function diversification.Furniture is deformed, maximum feature is to create space, and the same furniture can create multiple and different by deformation The space of function.Specifically, the connection methods such as to be exactly furniture design teacher buckled using connecting rod, machine, pulley increase the structure of furniture Variation makes furniture functions diversification using the modes such as folding, hiding, lifting, shared, displacement, as long as user passes through simply The operations such as passage, overturning, folding, rotation can complete the conversion between furniture different function.A kind of design in this way, makes Furniture produces the demand of a variety of environmental changes in single space, allows a space to serve as multiple spaces and uses, saves space-efficient New space has been createed simultaneously.

Wherein commonly deformation furniture includes folding bed, folding table, Telescopic table, Combined table-chair or divan, In, Telescopic table is generally dining table, mainly dilatation is realized by having the function of the mechanism of Telescopic, thus Two-stage or multistage adjusting are able to carry out to achieve the effect that adjust size of desktop or increase the desktop number of plies.

Existing Telescopic table mainly includes plug-type two kinds telescopic with rotation, such as application No. is: A kind of Novel extensible type round table driven by mechanical mechanism of CN201210168505.X, this part patent is by being divided into three for desktop Layer, and a kind of column type linkage mechanism is devised, it is its synchronous expansion, to reach telescopic effect.But this three-dimensional column linkage Mechanism structure is complex, and needs biggish vertical direction spatial, higher for space waste, and the rotation of its connecting rod initial state Angle is smaller, so that its resistance for rotating desktop is larger, biggish rotatory force is not only needed to be difficult to operate so as to cause it, but also Its structure is easily damaged, and causes its higher problem of desktop later maintenance cost.

Also for example application No. is CN201210187865.4 can automatically changing size desk, equally use connecting rod with Sliding-rail sliding structure, and being driven by the motor driver that is arranged on bottom plate, but the structure also need it is biggish Vertical direction spatial keeps its space utilization rate lower, and structure is complicated causes the maintenance cost in later period higher, while being driven using motor It is dynamic to keep its manufacturing cost higher.

The structure of connecting rod and sliding rail is mostly used in the prior art, and each sliding block is enabled by driven by rotary disc connecting rod Pushing out desktop makes its protruding formation table board structure, but usually structure is complicated for its driving mechanism, and is easy to occupy perpendicular To space, so that desktop thickness is larger；And existing flexible desktop is splitlevel structure, but rotates flexible structure often Cannot preferably be unfolded, be merely able to it is the partially unfolded achieve the effect that enlarged-area, and a complete planar structure can not be formed.

Utility model content

In order to solve, structure is complicated later maintenance cost of the existing technology is higher and splitlevel desktop can not spell completely The problem of connecing, the utility model aim is to provide a kind of deformation mechanism in rotation extension table can utilize sky as far as possible Between be spliced to form one to reducing space waste and enable to two layers of fan plate that can be fully deployed by liftable structure Desktop.

The technology employed by the present utility model is a kind of rotation splitlevel desktop unfolding mechanism of changeable table, including Turntable in A plane and fan board group are set, it is outside to rotate at least two crank groups that the turntable to be arranged on turntable The fan board group that crank group end is set is pushed to form an annular tabletop；The crank group includes being hinged on one side of turntable Upper crank and be hinged on the lower crank of another side, the fan board group includes the public fan hinged with upper crank and cuts with scissors with lower crank The female fan connect；Board group is fanned when expansion and is slid in and out by crank group promotion along straight line, and fan board group is unfolded outward from two layers of stacked state And female fan declines parallel with male fan and is finally spliced into an annular tabletop.

Firstly, mechanism is the rotation unfolding mechanism applied in rotation extension table, wherein the A plane is only used Come indicate its setting in one plane, specifically not limit be what table top, including desk or fixed planar support machine Structure.And the fan board group includes two blocks of sector structure plates that stacked on top state is kept in retracted position, wherein female Fan is upper, and public affairs fan is under.And female fan and male fan can be upper crank and lower crank by rotation turntable in A sliding on planes Corresponding fan plate is pushed to inwardly or outwardly slide.Wherein public fan only moves along a straight line, and female fan not only moves along a straight line And can be moved downward when close to outside position of maximum extension, it finally moves to and is flushed with public affairs fan, be then spliced to form a ring The table top set-ups of shape.

Further, the sliding block that the A plane is equipped with linear track and slides on linear track, the male fan and mother Fan, which is each attached on corresponding sliding block ascender line track, to be slided；It is additionally provided with fluctuating orbit in mother's fan bottom, outside fluctuating orbit Side end is equipped with inclined-plane, and female fan bottom is equipped with the A pulley slided on fluctuating orbit, mother's fan along the inclined-plane of fluctuating orbit to Lower movement is flushed with public affairs fan.The linear track is all the same, and the corresponding linear track two sides of each female fan are equipped with one Fluctuating orbit, and female upper bottom portion sets that there are two A pulleys, to have preferable stability.By with bevelled fluctuating orbit Guidance effect can be provided to female fan, so that it is moved up when being pulled by lower crank and stacked with public fan staggered floor.

Further, the A plane is equipped with four groups of fan board groups, wherein the upper crank of single crank group is cut with scissors in turntable Angle of the line A and lower crank in contact and the turntable center of circle between the line B in turntable hinge joint and the turntable center of circle is 14-17 °. It is worth noting that because the utility model does not limit its specific fan board group quantity, it is equal using the fan board group of different number It needs to carry out angles and positions restriction to upper crank and lower crank, so as to reach preferable using effect.But because common It is four groups, therefore only optimizes restriction to using four groups of fan board group.It is same to wrap including four female fans and four male fans Include four upper cranks and four lower cranks.Here angle is to being in same group of fan board group and corresponding same group of crank group carries out It limits, if mother's fan and male fan can not be aligned and be spliced into a complete slab construction not in 14-17 ° of angular range, General best angle is 15 °.

Further, female fan bottom is equipped with the lifting fixed plate being fixed on corresponding sliding block, the lifting fixed plate It is equipped at least two lifting shafts and female fan is socketed on lifting shaft and pumps；The public fan bottom is equipped with The parallel dead plate being fixed on corresponding sliding block.Two circular cavities are offered on mother's fan, and are equipped with linear bearing in hole, are led to Female frictional force fanned between lifting shaft can be reduced by crossing linear bearing, consequently facilitating female fan elevating movement.

Further, the upper crank and parallel dead plate are hinged, and lower crank and lifting fixed plate are hinged, the upper crank It include being not located on same plane and two horizontal parts being parallel to each other and for connecting the song of two horizontal parts with lower crank Type interconnecting piece, horizontal part is higher than inside horizontal part on the outside of the upper crank, and horizontal part end is with setting parallel on the outside of upper crank Pull rod top in fixed plate is hinged；Horizontal part is lower than inside horizontal part on the outside of the lower crank.Two levels described here Portion is not located at same plane and refers to it there are differences in height, to interfere when avoiding the problem that mutually rotating.

Further, the lifting fixed plate is equipped with drop-down spring, and the drop-down spring is connected with mother's fan and given always Mother's fan provides downward screen resilience female fan is moved at fluctuating orbit inclined-plane to be moved downward automatically；Female fan with it is adjacent male It fans contact surface and is equipped with tongue-and-groove, the tenon item with tongue and groove fit clamping limit is equipped on male fan and adjacent female fan contact surface；It is described Mother's fan back side is additionally provided with magnet slot, is equipped in magnet slot and is used to provide the magnet of downward pulling force to female fan；On the turntable Equipped with annular hollow-out layer.Here preferable lower pulling force can be provided to female fan by increasing drop-down spring, and by being equipped with magnet Lower pulling force can be further provided for, to make female fan that can stablize decline.And tongue-and-groove therein and tenon item are the female fans of guarantee and male Fan can increase mutual connection effect when being in same plane and being bonded, thus when forming a complete annular tabletop When, relatively stable planar structure can be formed by tongue-and-groove and tenon item.

Further, the turntable bottom passes through the center the A change being equipped with and connect with A Plane Rotation, the center A change Including the fixed disk mutually fastened and the change that fixed disk side is arranged in, the turntable is connect with fixed disk.Here to turntable Fixed form be defined, the center the A change described first is bolted by two cyclic structures, including bottom Aluminium alloy change and fixed disk, wherein fixed disk is used to fix, and change is fixed in A plane.And in the entire center A change Between be perforative through-hole structure, thus be reserved with certain space be used to place other equipment.

Further, the A disc that diameter is less than A center change, the A pad are additionally provided between turntable and the change of the center A Disk is fixed in the change of center, and the lower crank of withdrawal is accommodated by the annulus formed between A disc and the change of the center A.

A kind of multilayer desktop of the rotation splitlevel desktop unfolding mechanism using above-mentioned changeable table, the A plane is setting In the support baseboard top surface of turntable lower part, it is equipped with B disc far from the center A change side in the turntable, is padded by A disc and B Disk folder holds turntable；It is additionally provided with the change of the center B on B disc, table top is equipped in the change of the center B；The table top is turned by the center B Ring and B disc are rotatablely connected, and the B disc is fixedly connected with A disc；It is equipped with linkage mechanism on support baseboard, passes through linkage Table top and turntable are sequentially connected for mechanism and passing through Table top able to be rotated makes fan board group be unfolded or withdraw.It here is a kind of using above-mentioned The multilayer desktop of unfolding mechanism, because the unfolding mechanism needs rotating mechanism, drive is unfolded, and by having additional table top knot Structure is to provide another desktop to place article, and the table top is mutually rotatablely connected with support baseboard, turntable, by adding Rotation connection function is realized in the change of some centers B.Wherein, the change of the center A and the change of the center B are identical structure, same to have Have a change and fixed dish structure, but because setting position is different, and play the role of difference, thus using different scientific and technical terminologies into Row refers to.Wherein the change of the center B is to be inverted setting, and change is connect with table top, and fixed disk tips upside down on B disc, and with first The center A change in the four studs insertion B disc being fixed in the change of the center B with bottom is fixed.B disc therein and A are padded Disk is identical structure, primarily to avoid upper lower crank, can be turned when upper crank and lower crank inwardly rotates and shunk It moves into the gap between two discs and two center changes.When fixed, it is pierced by simultaneously from the change of the center B by four studs Sequentially pass through B disc, turntable, A disc and the change of the center A, and by the change of the center A hold-doun nut be fixedly connected. So that two center changes, two discs and turntable form a fixed connection.It is worth noting that the change of the center A and the change of the center B It is to be fixed by fixed disk, and screw rod same connect with two fixed disks, so that the change enable rotates.

Further, the linkage mechanism includes the central shaft for being fixed on support baseboard center, centrally disposed shaft On linkage unit and the push-pull device at fixed that is connected with linkage unit, the linkage unit include in being successively socketed in from top to bottom Set bar pallet, pressure spring cover board, central axis pressure spring on mandrels stem, the set bar pallet are equipped with linkage pin, pressure spring lid Plate and set bar pallet slide up and down in central shaft with upper and lower stretch of central axis pressure spring；The center A change and branch It is additionally provided with washer between support bottom plate and increases gap to guarantee that linkage mechanism being capable of stable operation.

The utility model has the following beneficial effects:

(1) the utility model is compact-sized, being capable of quick-expansion change by the female fan and male fan of turntable structure and splitlevel Shape, to achieve the effect that storage and increase desktop area；

(2) the utility model passes through the fluctuating orbit being equipped with and lifting fixed plate realizes the lifting effect of female fan, and can It can be realized as the servo-actuated lifting of female fan when rotating turntable, it is ingenious in design convenient for operation, and high stability；

(3) the utility model passes through the center the A change being equipped with and the change of the center B realizes that table top and the opposite of support baseboard turn It is dynamic, while fixation can either be facilitated by fixed disk and the structure of change, while will not influence its rotating effect again；

(4) the utility model, which passes through the B disc being equipped with and A disc, can avoid lower crank, when upper crank and lower crank It can be turned in the gap between two discs and two center changes when inwardly rotation is shunk；

(5) all fan board groups can be unfolded in the utility model by way of direct Table top able to be rotated, so that operation It is more convenient, while so that remaining equipment is connected transmission by mechanical connecting structure design, it is operated to reach easy Effect.

Detailed description of the invention

Outline structural diagram when Fig. 1 is the contraction of the utility model；

Outline structural diagram when Fig. 2 is the expansion of the utility model；

Fig. 3 is the split type configuration schematic diagram in part of the utility model；

Fig. 4 is the support baseboard of the utility model and the configuration schematic diagram of parts thereof；

Fig. 5 is the side perspective structural schematic diagram of the utility model；

Fig. 6 is female fan and the male annular tabletop structural schematic diagram fanned and be spliced to form of the utility model；

Fig. 7 is the perspective structure perspective diagram when female fan splices with male fan of the utility model；

Perspective structure perspective diagram when Fig. 8 is the contraction of the utility model；

Fig. 9 is perspective structure perspective diagram when female fan of the utility model falls just below parallel with male fan；

Figure 10 is the structural schematic diagram of the bottom surface of table top of the utility model；

Figure 11 is the axis geodesic structure schematic diagram of the bottom surface of table top of the utility model upward；

Figure 12 is the turntable of the utility model and the axis geodesic structure schematic diagram of crank group；

Figure 13 is the turntable of the utility model and the overlooking structure diagram of crank group, wherein it is hinged to have marked out upper crank Point, respectively with the optimum angle of circle center line connecting, is 15 ° with lower crank hinge joint；

Figure 14 is the structural schematic diagram of female fan of the utility model and the linear bearing of bottom；

Figure 15 is the lifting fixed plate structure schematic diagram of the utility model；

Figure 16 is the parallel dead plate structural schematic diagram of the utility model；

Figure 17 is the male fan and female fan connecting end surface structure schematic diagram of the utility model；

Figure 18 is the side structure schematic view of the gliding groove of the utility model；

Lateral parts structural schematic diagram when Figure 19 is female fan lifting of the utility model；

Figure 20 is the table top overlooking structure diagram of the utility model；

Figure 21 is the support baseboard upper surface axis side structure schematic diagram with linkage mechanism of the utility model；

Figure 22 is that the support baseboard bottom surface of the utility model is equipped with the structural schematic diagram of push-and-pull fixture；

Figure 23 is the structural schematic diagram of the center the A change of the utility model；

Figure 24 is the structural schematic diagram of the A disc of the utility model；

Figure 25 is the utility model support baseboard axis side structure schematic diagram；

Figure 26 is the support baseboard overlooking structure diagram with linkage mechanism of the utility model；

Figure 27 is the axis side structure schematic diagram of the utility model set bar pallet；

Figure 28 is the structural schematic diagram of the utility model linkage unit；

Figure 29 is the axis side structure schematic diagram of the utility model steel wire pressing plate；

Figure 30 is the structural schematic diagram of the utility model steel wire flexible deep gouge and steel wire bar deep gouge.

In figure: 1- turntable, the upper crank of 2-, 3- lower crank, 4- public affairs fan, mother's 5- fan, 6- linear track, 7- sliding block, 8- lifting Fixed plate, 9- lifting shaft, 10- pull rod, 11- pull down spring, 12- fluctuating orbit, the change of the center 13-A, 14-A disc, 15- tenon Slot, 16- tenon item, 17- magnet slot, 18-B disc, the change of the center 19-B, 20- table top, 21- table circle, 22-B pulley, 23- glide Slot, 24- baffle, 25- wedge block, 26-B block, 27- parallel dead plate, 28- support baseboard, 29-A block, 30-A pulley, 31- Central shaft, 32- set bar pallet, 33- pressure spring cover board, 34- central axis pressure spring, 35- linkage pin, 36- retaining rail, 37- are sliding Dynamic rail, 38- connecting rod, 39- push and pull fixture, the left steel wire of 40-, the right steel wire of 41-, 42- steel wire pressure bar, 43- intercommunicating pore, 44- steel wire Flexible deep gouge, 45- steel wire bar deep gouge, 46- steel wire cover board, 47- steel wire through-hole, 48- stretch through-hole.

Specific embodiment

With reference to the accompanying drawing and specific embodiment does further explaination to the utility model.

Embodiment 1:

The present embodiment is a kind of rotation splitlevel desktop unfolding mechanism of changeable table, such as Figure 25, Figure 12, Figure 13 and Fig. 4 institute Show, including the turntable 1 being arranged in A plane and fan board group, rotates the turntable 1 and make that at least two on the turntable 1 are arranged Crank group pushes out fan board group one annular tabletop of formation that crank group end is arranged in；The crank group includes being hinged on to turn The upper crank 2 of 1 one sides of disk and the lower crank 3 for being hinged on another side, the fan board group includes the public affairs hinged with upper crank 2 Fan 4 and the female fan 5 hinged with lower crank 3；Board group is fanned when expansion and is slid in and out by crank group promotion along straight line, fans board group from two layers Stacked state is unfolded outward and 5 decline of female fan is parallel with male fan 4 and is finally spliced into an annular tabletop.

Embodiment 2:

The present embodiment is to optimize restriction on the basis of above-described embodiment 1, such as Figure 14, Figure 15, Figure 16 and Figure 17 institute Show, the sliding block 7 for being equipped with linear track 6 in A plane and being slided on linear track 6, the male fan 4 and female fan 5 are each attached to It is slided on corresponding 7 ascender line track 6 of sliding block；It is additionally provided with fluctuating orbit 12 in 5 bottoms of mother's fan, in 12 outboard end of fluctuating orbit Portion is equipped with inclined-plane, and 5 bottoms of female fan are equipped with the A pulley 30 slided on fluctuating orbit 12, and mother's fan 5 is along the oblique of fluctuating orbit 12 Movement is flushed with public affairs fan 4 downwards.A plane is equipped with four groups of fan board groups, wherein the upper crank 2 of single crank group is in turntable 1 Angle of the line A and lower crank 3 in 1 center of circle of hinge joint and turntable between the line B in 1 center of circle of 1 hinge joint of turntable and turntable be 14-17°

It is equipped with the lifting fixed plate 8 being fixed on corresponding sliding block 7 in 5 bottoms of female fan, the lifting fixed plate 8 is equipped with extremely Lack two lifting shafts 9 and female fan 5 is socketed on lifting shaft 9 and pumps；4 bottoms of the public fan, which are equipped with, to be fixed Parallel dead plate 27 on corresponding sliding block 7.Two circular cavities are offered on mother's fan 5, and are equipped with linear bearing in hole, are led to Female frictional force fanned between 5 and lifting shaft 9 can be reduced by crossing linear bearing, consequently facilitating 5 elevating movements of female fan.Upper crank 2 with Parallel dead plate 27 is hinged, and lower crank 3 and lifting fixed plate 8 are hinged, and the upper crank 2 and lower crank 3 are same including being not located at In one plane and two horizontal parts being parallel to each other and for connecting the curved interconnecting piece of two horizontal parts, outside the upper crank 2 Side horizontal part is higher than inside horizontal part, on upper 2 outside horizontal part end of crank and the pull rod 10 being arranged on parallel dead plate 27 Portion is hinged；The 3 outside horizontal part of lower crank is lower than inside horizontal part.Two horizontal parts described here are not located at same plane Referring to it, there are differences in height, to interfere when avoiding the problem that mutually rotating.

It goes up and down fixed plate 8 and is equipped with drop-down spring 11, the drop-down spring 11 connect with mother's fan 5 and mentions always to female fan 5 For downward screen resilience female fan 5 is moved at 12 inclined-plane of fluctuating orbit to move downward automatically；Female fan 5 and adjacent male fan 4 contact surfaces are equipped with tongue-and-groove 15, and the tenon item for cooperating clamping limit with tongue-and-groove 15 is equipped on male fan 4 and 5 contact surfaces of adjacent female fan 16；5 back sides of female fan are additionally provided with magnet slot 17, are equipped in magnet slot 17 and are used to provide the magnetic of downward pulling force to female fan 5 Iron；The turntable 1 is equipped with annular hollow-out layer.1 bottom of turntable passes through the center the A change 13 being equipped with and connect with A Plane Rotation, institute Stating the center A change 13 includes the fixed disk mutually fastened and the change that fixed disk side is arranged in, and the turntable 1 connects with fixed disk It connects.

The A disc 14 that diameter is less than A center change 13, the A disc are additionally provided between turntable 1 and the center A change 13 14 are fixed in the change of center, and the lower song of withdrawal is accommodated by the annulus formed between A disc 14 and the center A change 13 Handle 3.

Embodiment 3:

The present embodiment be it is a kind of using above-mentioned changeable table rotation splitlevel desktop unfolding mechanism multilayer desktop, as Fig. 1, Shown in Fig. 2, Figure 18, Figure 19, Figure 20, Figure 23 and Figure 24, A plane is that 28 top surface of support baseboard of 1 lower part of turntable is arranged in, in institute It states turntable 1 and is equipped with B disc 18 far from 13 side of the center A change, turntable 1 is clamped by A disc 14 and B disc 18；In B disc 18 On be additionally provided with the center B change 19, in the center B change 19 be equipped with table top 20；The table top 20 is padded by the center B change 19 and B Disk 18 is rotatablely connected, and the B disc 18 is fixedly connected with A disc 14.

It is equipped with linkage mechanism on support baseboard 28, makes table top 20 be sequentially connected and lead to turntable 1 by linkage mechanism Crossing Table top able to be rotated 20 makes to fan board group expansion or withdraw.It here is a kind of multilayer desktop using above-mentioned unfolding mechanism, because of the exhibition Opening mechanism needs rotating mechanism drive to be unfolded, and is placed by having additional table top 20 structure to provide another desktop Article, and the table top 20 and support baseboard 28, turntable 1 are mutually rotatablely connected, and are realized by the center the B change 19 having additional It is rotatablely connected function.

Wherein, the center A change 13 and the center B change 19 are identical structure, equally have change and fixed dish structure, but Because it is different that position is arranged, and plays the role of difference, therefore referred to using different scientific and technical terminologies.The wherein center B change 19 is are inverted setting, and change is connect with table top 20, and fixed disk tips upside down on B disc 18, and with being first fixed on the change of the center B It is fixed with the center the A change 13 of bottom in four studs insertion B disc 18 on 19.B disc 18 and A disc 14 therein is Identical structure, primarily to upper lower crank 3 is avoided, when upper crank 2 and lower crank 3 can turn to when inwardly rotation is shunk In gap between two discs and two center changes.When fixed, be pierced by from the center B change 19 by four studs and according to It is secondary pass through B disc 18, turntable 1, A disc 14 and the center A change 13, and by the center A change 13 hold-doun nut consolidated Fixed connection.So that two center changes, two discs and turntable 1 form a fixed connection.It is worth noting that the center A change 13 It is to be fixed by fixed disk, and screw rod same connect with two fixed disks with the center B change 19, thus the change made It can rotate.Wherein, the linkage mechanism includes the central shaft 31 for being fixed on 28 center of support baseboard, centrally disposed shaft Linkage unit on 31 and the push-pull device at fixed being connected with linkage unit, the linkage unit include successively being socketed in from top to bottom Set bar pallet 32, pressure spring cover board 33, central axis pressure spring 34 in central shaft 31, the set bar pallet 32 are equipped with linkage Pin 35, pressure spring cover board 33 and set bar pallet 32 above glide in central shaft 31 with upper and lower stretch of central axis pressure spring 34 It is dynamic；It is additionally provided with washer between the center A change 13 and support baseboard 28 and increases gap to guarantee that linkage mechanism can stablize fortune Row.

Embodiment 4:

The present embodiment is a kind of changeable table of multilayered structure, including chassis and the desk body that is arranged on chassis, wherein desk body Including main four structures: support baseboard 28, rotary extension desktop, table top 20 and table circle 21.Wherein, support baseboard 28 is fixed Supporting member on chassis, as bottommost.

As shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, rotary extension desktop, including turntable 1,1 one side of turntable The central angles such as the rich center of circle set that there are four upper cranks 2, and hinged there are four lower songs for equally corresponding upper crank 2 on 1 another side of turntable Handle 3.Equal central angles are equipped with eight linear tracks 6 on support baseboard 28, and slidable sliding block 7 is equipped on linear track 6, Upper 2 outboard end of crank is hinged with parallel dead plate 27.The parallel dead plate 27 is a kind of plate-shaped piece of metal, is above offered more A hole is used to fix, and the parallel dead plate 27 is bolted on corresponding sliding block 7.It is leaned in parallel dead plate 27 Nearly upper 2 end of crank is equipped with the pull rod 10 perpendicular to parallel dead plate 27, and upper crank 2 and 10 top of pull rod are hinged.

3 outboard end of lower crank is hinged with lifting fixed plate 8, and the lifting fixed plate 8 is similarly a kind of metal plate Shape structure, and side is equipped with two lifting shafts 9 perpendicular to lifting fixed plate 8 on it, and respectively sets in lifting 8 two sides of fixed plate There is the ear handle for having strip-shaped hole.Lifting fixed plate 8 is bolted on remaining four corresponding sliding blocks 7, and is gone up and down Fixed plate 8 and the interval of parallel dead plate 27 are arranged.The lower crank 3 is directly hinged with lifting 8 end of fixed plate, so that lifting is solid Fixed board 8 and parallel dead plate 27 are in same level.

It is equipped with female fan 5 in lifting fixed plate 8, public fan 4 is equipped on parallel dead plate 27.Wherein female fan 5 and 4 rulers of male fan It is very little identical, open up on mother's fan 5 there are four through-hole, two of them from the back side inserted with linear bearing, by the way that linear axis will be had The through-hole held, which is aligned with lifting shaft 9 and lifting shaft 9 is enable to pass through linear bearing, makes female fan 5 move up and down along lifting shaft 9.And Drop-down spring 11 is connected on the ear handle of lifting 8 two sides of fixed plate, the spring 11 that pulls down is from the through-hole being arranged on female fan 5 It is pierced by and is fixed in end equipped with fixing piece upwards.Public fan 4 is equipped on parallel dead plate 27, the public fan 4 passes through spiral shell Bolt is fixed on parallel dead plate 27.It is additionally provided with magnet slot 17 in 5 bottoms of mother's fan simultaneously, magnet is equipped in magnet slot 17.And Lifting fixed plate 8 is metal material, and downward pulling force is equally provided by magnet.

Wherein, upper crank 2 includes two parallel portions and a curved interconnecting piece for being used to connect with lower crank 3.Upper song Handle 2 and the hinged parallel portion of turntable 1, which are higher than, fans 4 hinged parallel portions with public affairs, and the parallel portion hinged with turntable 1 of lower crank 3 is lower than 5 hinged parallel portions are fanned with mother, the parallel portion of inside is arcuate shape, and the parallel portion in outside is linear structure, but on The radian in the inside parallel portion of crank 2 is less than 3 inside parallel portion of lower crank.The upper crank 2 and lower crank 3 passes through certain arc The design of shape structure and the structure design of upper and lower two parallel portion generate obstruction when effectively can avoid mutually rotating.And upper crank 2 Difference in height between 3 outboard end of lower crank is equal to 10 height of pull rod being arranged on parallel dead plate 27.

The linear track 6 of corresponding lifting 8 lower part of fixed plate is equipped with fluctuating orbit 12, the lift rail on support baseboard 28 Road 12 sets there are two and is symmetricly set on 6 two sides of linear track, sets that there are two A pulley 30, each A pulleys 30 in 5 bottoms of mother's fan It is corresponding with fluctuating orbit 12 and at an upper portion thereof along fluctuating orbit 12 slide.Fluctuating orbit 12 how close to outboard end be equipped with inclined-plane.

When entire turntable 1 rotates, upper crank 2 drives male fan 4 inwardly or outwardly to move with mother's fan 5 with lower crank 3, to outward transport When dynamic, public affairs fan 4 moves along a straight line, and remains and move in outward direction.And female fan 5 is outside with the promotion of lower crank 3 Side movement.Because when keeping receiving state, mother's fan 5 be stacked on two it is adjacent it is male fan 4 junction tops, when pushing out mother When fanning 5, mother's fan 5 will do it three sections of motion processes.The fluctuating orbit 12 of first segment, Xiang Pingzhi carries out parallel lines movement outward； Second segment, when A pulley 30 moves on inclined-plane, entire female fan 5 receives the pulling force of drop-down spring 11 and magnet down along inclined-plane Movement, and finally move to and fanned at 4 on the same plane with public.At this time between male fan 4 and female fan 5 there is also certain interval, But female fan 5 has been in position of maximum extension at this time, that is to say, that the center of circle of two hinge joints and turntable 1 of lower crank 3 at this time Place is on the same line；Third section, lower crank 3 inwardly retracts female fan 5 at this time, and public fan 4 continues to move out, until public affairs fan 4 Formation one complete cyclic annular table board structure is bonded with mother's fan 5.And the process inwardly moved is to rotate backward turntable 1, and mistake Journey with above-mentioned to move out process opposite.

Wherein, in order to provide stability, female fan 5 is equipped with tongue-and-groove 15 with 4 contact surfaces of adjacent male fan, it is public fan 4 and 5 contact surfaces of adjacent female fan are equipped with the tenon item 16 for cooperating clamping limit with tongue-and-groove 15.When mother's fan 5 contacts fitting with male fan 4, tenon Item 16 and the clamping of tongue-and-groove 15 limit are to provide the support force on vertical direction to entire annular desktop.

The A disc 14 and B disc 18 for clamping turntable 1, the A disc 14 and B disc 18 are additionally provided in 1 two sides of turntable Structure size is identical, and is equipped with the center A change 13 in 28 center of support baseboard, and the A disc 14 is fixed on the change of the center A On 13, the washer for being spaced is additionally provided between 13 bottom of the center A change and support baseboard 28.

As shown in Figure 10 and Figure 11, the table top 20 is the circular plate structure of size identical as support baseboard 28, bottom Face sets that there are six fixed blind holes by the central angles such as entad, and there are six the surfaces of blind hole to be equipped with metal shielding setting, For providing structural strength.The center B change 19, the centre of the center B change 19 are additionally provided in 20 bottom center position of table top Hole radius is greater than the radius of the circular annular form structure of six fixed blind hole compositions, so that all fixed blind holes can be exposed.

Wherein, the center A change 13 and the center B change 19 are identical structure, equally have change and fixed dish structure, but Because it is different that position is arranged, and plays the role of difference, therefore referred to using different scientific and technical terminologies.The wherein center B change 19 is are inverted setting, and change is connect with table top 20, and fixed disk tips upside down on B disc 18, and with being first fixed on the change of the center B It is fixed with the center the A change 13 of bottom in four studs insertion B disc 18 on 19.B disc 18 and A disc 14 therein is Identical structure, primarily to upper lower crank 3 is avoided, when upper crank 2 and lower crank 3 can turn to when inwardly rotation is shunk In gap between two discs and two center changes.When fixed, be pierced by from the center B change 19 by four studs and according to It is secondary pass through B disc 18, turntable 1, A disc 14 and the center A change 13, and by the center A change 13 hold-doun nut consolidated Fixed connection.So that two center changes, two discs and turntable 1 form a fixed connection.It is worth noting that the center A change 13 It is to be fixed by fixed disk, and screw rod same connect with two fixed disks with the center B change 19, thus the change made It can rotate.

The table circle 21 is socketed on the outside of support baseboard 28 and rotary extension desktop, and table circle 21 can have mercy on 28 turns of support baseboard The movement of dynamic and downward spiral exposes the gap between table top 20 and support baseboard 28 to keep rotary extension desktop protruding.Table It encloses on 21 inner rings and is provided at least three B pulleys 22, the B pulley 22 and 28 top surface outer ring contact slide of support baseboard, and 28 outer ring of support baseboard is equipped with gliding groove 23 corresponding with B pulley 22, and is equipped in 23 bottom surface of gliding groove and is used to stop B pulley 22 continue the baffle 24 for dropping out gliding groove 23 downwards；23 side of gliding groove is equipped with inclined-plane, and in the gliding groove close to inclined-plane 23 edges, which are equipped with, is used to padded wedge block 25,25 thickness of wedge block and 23 depth of gliding groove and no more than table top 20 with The spacing of support baseboard 28.The gliding groove 23 is additionally provided with A block 29 far from 25 side of wedge block, in wedge block 25 far from downslide 23 side of slot is equipped with B block 26；It is equipped with bolt on table circle 21, is moved on wedge block 25 simultaneously when B pulley 22 is ramped up Bolt is pulled to rotate table circle 21 can not to realize positioning when resisting B block 26.Rotary extension desktop includes that setting is supporting Turntable 1 and fan board group on bottom plate 28, rotate the turntable 1 and at least two crank groups being arranged on the turntable 1 are pushed out The dynamic fan board group that crank group end is arranged in forms an annular tabletop.

In entire desk body structure, table top 20 can be relatively rotated with turntable 1, realize table top by the linkage mechanism being equipped with Transmission connection between 20 and turntable 1.

As shown in Figure 21, Figure 22, Figure 26, Figure 27, Figure 28, Figure 29 and Figure 30, linkage mechanism includes being fixed on support baseboard Central shaft 31, the linkage unit on centrally disposed shaft 31 and the push-pull device at fixed being connected with linkage unit at 28 centers, The linkage unit includes the set bar pallet 32 being successively socketed in central shaft 31 from top to bottom, pressure spring cover board 33, center Axis pressure spring 34, the set bar pallet 32 are equipped with linkage pin 35, and pressure spring cover board 33 and set bar pallet 32 are with central axis Upper and lower stretch of pressure spring 34 slides up and down in central shaft 31；The push-pull device at fixed includes steel wire and is arranged in support baseboard Push-and-pull fixture 39, expansion rail on 28, the push-and-pull fixture 39 connect with one end of expansion rail and drive expansion rail sliding Dynamic, the other end of expansion rail is connect by steel wire with the bottom of pressure spring cover board 33, and the sliding rail that stretches passes through pierce tap dynamic pressure spring lid 33 extruding center axis pressure spring 34 of plate stretches in central shaft 31.

Central shaft 31 is noticeable for limiting central axis pressure spring 34, pressure spring cover board 33 and set bar pallet 32 It is that pressure spring cover board 33 and set bar pallet 32 are socketed in central shaft 31 by centrally-disposed through-hole, pressure spring Cover board 33 and set bar pallet 32 pass through the elastic hanging pneumatics of central axis pressure spring 34 on central axis pressure spring 34, set bar pallet Linkage pin 35 on 32 is used to connect each layer desktop of deformation desktop, is equipped with coaxial linkage hole on each layer desktop, passes through The linkage hole that the linkage insertion of pin 35 is located on each layer desktop can drive each layer desktop to rotate together, and the desktop of each layer It is successively set on the top of set bar pallet 32, when in use, moves push-and-pull fixture 39 to the direction far from central axis pressure spring 34, Expansion rail drives steel wire mobile to the direction far from central shaft 31 at this time, the mobile compression center of pierce tap dynamic pressure spring cover board 33 Axis pressure spring 34, central axis pressure spring 34 is shunk at this time, and pressure spring cover board 33 and set bar pallet 32 move down, at this time set bar pallet 32 are detached from each layer desktop on top, and each layer desktop independently rotates；Push-and-pull fixture is moved to the direction close to central axis pressure spring 34 39, steel wire reduces the pressure of pressure spring cover board 33 at this time, and pressure spring cover board 33 moves up under the elastic force of drop-down spring 11, links Pin pallet 32 moves up, and linkage pin 35 is connected to the linkage hole of each layer desktop, and thus each layer desktop can rotate together； It is worth noting that, set bar pallet 32 can be freely rotated in central shaft 31, and set bar pallet 32 and pressure spring lid It is absolute construction between plate 33, do not interact respective rotation.Expansion rail includes retaining rail 36 and is arranged in retaining rail Sliding rail 37 on 36；One end of the sliding rail 37 is connect by steel wire with 33 bottom of pressure spring cover board, and the other end passes through connection Bar 38 is connect with push-and-pull fixture 39；Retaining rail 36 is bolted to connection on the surface of corresponding position.

In order to guarantee stability of the pressure spring cover board 33 when receiving steel wire and pulling, steel wire includes left steel wire 40 and right steel wire 41, Zuo Gangsi 40 and right steel wire 41 one end be commonly connected to sliding rail 37 on, the other end pair of Zuo Gangsi 40 and right steel wire 41 Claim the two sides for being connected to 33 bottom midpoint of pressure spring cover board, by being pulled simultaneously with steel wire at the both ends of pressure spring cover board 33, phase Than there is better stability in single steel wire, slide up and down pressure spring cover board 33 steadily in central shaft 31, no It shifts.

Push-pull device at fixed further includes the steel wire pressure bar 42 being arranged on support baseboard 28 for changing steel wire draw direction；Due to The position of expansion rail and pressure spring cover board 33 is different, is likely to result in when steel wire pulls pressure spring cover board 33 that there are various lateral forces Situation, and steel wire is influenced to the pulling effect of pressure spring cover board 33, the steel wire pressure bar 42 of setting is used for the steering guide rail as steel wire, Change the draw direction of steel wire, to improve the cooperation between steel wire and pressure spring cover board 33.

The upper surface of support baseboard 28 is additionally provided with two and is respectively used to place left steel wire 40 and the steel wire of right steel wire 41 is flexible One end of deep gouge 44, the flexible deep gouge 44 of steel wire is located at 36 side of retaining rail, and the other end is located at 33 bottom of pressure spring cover board, described The flexible deep gouge 44 of steel wire is connected with steel wire bar deep gouge 45 in the side close to pressure spring cover board 33, and steel wire pressure bar 42 is arranged in steel wire bar In deep gouge 45；The steel wire for being located at 28 surface of support baseboard is arranged and is stretched in deep gouge 44 to steel wire, secures steel wire flexible Route in the process, avoids steel wire from interfering with each other in a relaxed state, so that use below goes wrong.On support baseboard 28 also Equipped with for preventing steel wire from skidding off the steel wire cover board 46 of the flexible deep gouge 44 of steel wire, the steel wire cover board 46 is in steel wire bar deep gouge 45 Top is equipped with steel wire through-hole 47, and steel wire cover board 46 is bolted to connection on support baseboard 28.It will by steel wire cover board 46 The flexible deep gouge 44 of steel wire covers, so that the surface of support baseboard 28 is more clean and tidy and beautiful.Simultaneously as the center A change 13 with It is equipped with washer between support baseboard 28, so that row forms certain gap, steel wire can be prevented by the steel wire cover board 46 being equipped with It drops out to influence other organisation operations outward.

Support baseboard 28 is equipped with the hand for placing push-and-pull fixture 39 between 28 edge of support baseboard and push-and-pull fixture 39 The flexible through-hole 48 of handle, when handle pulls out steel wire, handle can be placed into flexible through-hole 48, convenient for push-and-pull fixture 39 Handle placement while for handle rotation provide can big rotational angle, also make entire desk body cleaner and tidier, be worth It is noted that flexible through-hole 48 can also be able to be that 28 bottom surface of support baseboard is arranged in for through the through-hole of support baseboard 28 The groove of handle can be placed.

It is worth noting that because 28 center of support baseboard is equipped with the center A change 13, and among the center A change 13 For hollow structure, there are a spaces, the linkage unit to be just arranged for its center when being fastened on support baseboard 28 In the space.And the center A change 13 can be open and cover by the A disc 14 on 13 top of the center A change, the set bar described at this time Column 35 sequentially passes through A disc 14, turntable 1, B disc 18 and the center B change 19, wherein sets on A disc 14, turntable 1 and B disc 18 Have for the through-hole that passes through of linkage pin 35, through-hole need to be only aligned by when installation.And set bar pallet 32 can be in the change of the center A It pumps in 13 along axis, and the central axis pressure spring 34 of lower part pushes pressure spring cover board 33 and set bar pallet 32 court always Upper movement, so that linkage pin 35 is inserted into fixed blind hole, so that turntable 1 and table top 20 be made to be sequentially connected.Here pass through The steel wire pressing plate cooperates with the washer that 13 bottom of the center A change is arranged in, and avoids left steel wire 40 and right steel wire 41 from steel wire It is dropped out in flexible deep gouge 44, and can guarantee that steel wire can be slided smoothly and pressure spring cover board 33 is pulled to move downward.And it links Pin 32 center of pallet is socketed in central shaft 31, and the linear bearing by being equipped with has lower frictional force, so that linkage Pin pallet 32 can have mercy on central shaft 31 rotation.

The application method of the present embodiment: desk body entire first, which is in, fastens retracted position, at this time as shown in Figure 1.Then it draws The bolt of table circle 21 out, and rotary table circle 21 makes its downward screw expose rotary extension desktop.Push-and-pull fixture is pulled at this time 39, so that linkage pin 35 is inserted into the fixation blind hole being arranged on 20 bottom surface of table top, so that table top 20 and turntable 1 are rotatablely connected. If for linkage pin 35 just on the outside of fixed blind hole, slow Table top able to be rotated 20 to link pin 35 in central axis pressure spring at this time Alignment is moved upwards under 34 promotion and is inserted into corresponding fixed blind hole reaches transmission connection.Table top able to be rotated 20 to rotate at this time Flexible desktop rotates protruding simultaneously, can both stop when mother's fan 5 be bonded with male fan 4 and forms a completely ring-type desktop Table top able to be rotated 20.Then pull push-and-pull fixture 39 enable linkage pin 35 dropped out in central blind hole again make table top 20 with Turntable 1 is detached from rotation.Table top 20 can be rotated arbitrarily at this time, and the cyclic annular desktop of lower layer has been formed, and reach expansion effect.

The installation process of the present embodiment: firstly, by support baseboard 28 be arranged on chassis, while by linear track 6, lifting Track 12, central shaft 31, wedge block 25 and stopper are arranged on support baseboard 28.And it is parallel dead plate 27 and lifting is solid Fixed board 8 is mounted on corresponding sliding rail.And dug on support baseboard 28 steel wire stretch deep gouge 44, edge gliding groove 23, Institute's hole.Then the center A change 13 is installed, when installation center change, because fixed disk and change are identical radius Size, and be that will connect bolt between change and support baseboard 28, therefore use a kind of cleverly installation method.In fixed disk The fixation hole of corresponding change is equipped with through-hole, because change is equipped with multiple fixation holes and is used to install bolt, but only need to be in fixed disk It is equipped with a through-hole.Rotation fixed disk makes through-hole correspond to each fixation hole at this time, then by bolt from through-hole side It penetrates and is inserted into corresponding fixation hole and be fixed, successively rotating fixed disk then can be achieved consolidating change and support baseboard 28 Fixed connection.Then A disc 14 and turntable 1 are placed in the center A change 13.Simultaneously by hingedly on the turntable 1 upper crank 2 with Lower crank 3 is correspondingly connected on parallel dead plate 27 or lifting fixed plate 8.B disc 18 and table top 20 are installed again at this time.And in B Heart change 19 is directly first to be mounted in the way of the center A change 13 on 20 bottom surface of table top, and be equipped in the center B change 19 Four studs.Corresponding four are equipped in the center A change 13, A disc 14, turntable 1, B disc 18, the center B change 19 to lead to Hole, also by four through-holes alignment of all components when installation, stud energy when convenient for tipping upside down on table top 20 on B disc 18 It is enough to be just inserted into four through-holes and close window A center change 13, A disc 14, turntable 1, B disc 18 and the center B change 19.Finally In fixed bolt.

The utility model is not limited to above-mentioned optional embodiment, anyone can obtain under the enlightenment of the utility model Other various forms of products out.Above-mentioned specific embodiment should not be understood the limitation of the pairs of protection scope of the utility model, The protection scope of the utility model should be subject to be defined in claims, and specification can be used for explaining that right is wanted Seek book.

Claims (10)

1. a kind of rotation splitlevel desktop unfolding mechanism of changeable table, it is characterised in that: including the turntable being arranged in A plane (1) and fan board group it, rotates the turntable (1) and makes at least two crank groups on turntable (1) are arranged and push out setting and exist The fan board group of crank group end forms an annular tabletop；The crank group includes the upper song for being hinged on (1) side of turntable Handle (2) and the lower crank (3) for being hinged on another side, the fan board group include that the public affairs hinged with upper crank (2) fan (4) and under The hinged female fan (5) of crank (3)；Board group is fanned when expansion and is slid in and out by crank group promotion along straight line, and fan board group is stacked from two layers State is unfolded outward and female fan (5) decline is parallel with male fan (4) and is finally spliced into an annular tabletop.

2. a kind of rotation splitlevel desktop unfolding mechanism of changeable table according to claim 1, it is characterised in that: the A The sliding block (7) that plane is equipped with linear track (6) and slides on linear track (6), the male fan (4) and female fan (5) are solid It is scheduled on corresponding sliding block (7) ascender line track (6) and slides；Fluctuating orbit (12) are additionally provided in mother's fan (5) bottom, are being gone up and down Track (12) outboard end is equipped with inclined-plane, and female fan (5) bottom is equipped with the A pulley (30) slided on fluctuating orbit (12), Mother's fan (5) is moved downward along the inclined-plane of fluctuating orbit (12) to be flushed with male fan (4).

3. a kind of rotation splitlevel desktop unfolding mechanism of changeable table according to claim 1 or 2, it is characterised in that: institute A plane is stated equipped with four groups of fan board groups, wherein the upper crank (2) of single crank group is in turntable (1) hinge joint and turntable (1) Angle of the line A and lower crank (3) in the center of circle between turntable (1) hinge joint and the line B in turntable (1) center of circle is 14-17 °.

4. a kind of rotation splitlevel desktop unfolding mechanism of changeable table according to claim 1 or 2, it is characterised in that: institute It states female fan (5) bottom and is equipped with the lifting fixed plate (8) being fixed on corresponding sliding block (7), the lifting fixed plate (8) is equipped with extremely Lack two lifting shafts (9) and female fan (5) is socketed on lifting shaft (9) and pumps；Described public fan (4) bottom Equipped with the parallel dead plate (27) being fixed on corresponding sliding block (7).

5. a kind of rotation splitlevel desktop unfolding mechanism of changeable table according to claim 4, it is characterised in that: on described Crank (2) and parallel dead plate (27) hingedly, lower crank (3) and lifting fixed plate (8) hingedly, the upper crank (2) and lower song Handle (3) includes being not located at two horizontal parts on same plane and being parallel to each other and for connecting the curved company of two horizontal parts Socket part, upper crank (2) the outside horizontal part are higher than inside horizontal part, and horizontal part end and setting are being put down on the outside of upper crank (2) Pull rod (10) top in row fixed plate (27) is hinged；Horizontal part is lower than inside horizontal part on the outside of the lower crank (3).

6. a kind of rotation splitlevel desktop unfolding mechanism of changeable table according to claim 5, it is characterised in that: the liter It drops fixed plate (8) and is equipped with drop-down spring (11), the drop-down spring (11) connect with mother's fan (5) and mentions always to female fan (5) For downward screen resilience female fan (5) is moved at fluctuating orbit (12) inclined-plane to move downward automatically；Female fan (5) and phase Adjacent public fan (4) contact surface is equipped with tongue-and-groove (15), is equipped on male fan (4) and adjacent female fan (5) contact surface and matches with tongue-and-groove (15) Close the tenon item (16) of clamping limit；Described female fan (5) back side is additionally provided with magnet slot (17), is equipped in magnet slot (17) and is used to give Mother's fan (5) provides the magnet of downward pulling force；The turntable (1) is equipped with annular hollow-out layer.

7. a kind of rotation splitlevel desktop unfolding mechanism of changeable table according to claim 1 or 2, it is characterised in that: institute It states turntable (1) bottom to connect by the center the A change (13) being equipped with A Plane Rotation, the center A change (13) includes mutual The fixed disk of fastening and the change that fixed disk side is arranged in, the turntable (1) connect with fixed disk.

8. a kind of rotation splitlevel desktop unfolding mechanism of changeable table according to claim 7, it is characterised in that: in turntable (1) the A disc (14) that diameter is less than the change of the center A (13) is additionally provided between the center A change (13), the A disc (14) is solid It is scheduled on the change of the center A (13), withdrawal is accommodated by the annulus formed between A disc (14) and the center A change (13) Lower crank (3).

9. a kind of multilayer desktop of the rotation splitlevel desktop unfolding mechanism using changeable table described in claim 8, feature Be: the A plane is setting in support baseboard (28) top surface of turntable (1) lower part, is turned in the turntable (1) far from the center A Ring (13) side is equipped with B disc (18), passes through A disc (14) and B disc (18) clamping turntable (1)；It is also set on B disc (18) There are the change of the center B (19), is equipped with table top (20) on the change of the center B (19)；The table top (20) by the change of the center B (19) with B disc (18) rotation connection, the B disc (18) are fixedly connected with A disc (14)；Gear is equipped on support baseboard (28) Structure, by linkage mechanism make table top (20) and turntable (1) be sequentially connected and by Table top able to be rotated (20) make to fan board group expansion or It withdraws.

10. a kind of multilayer desktop according to claim 9, it is characterised in that: the linkage mechanism includes being fixed on support Central shaft, the linkage unit on centrally disposed shaft and the push-and-pull dress being connected with linkage unit at bottom plate (28) center It sets, the linkage unit includes the set bar pallet, pressure spring cover board, central axis pressure being successively socketed in central shaft from top to bottom Spring, the set bar pallet are equipped with linkage pin, pressure spring cover board and set bar pallet as the upper and lower of central axis pressure spring stretches It is slided up and down in central shaft；It is additionally provided with washer between the center A change and support baseboard (28) and increases gap to guarantee Linkage mechanism being capable of stable operation.