CN106597682A

CN106597682A - Telescopic leg frame of linkage folding glasses

Info

Publication number: CN106597682A
Application number: CN201510675606.XA
Authority: CN
Inventors: 陈永明
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-10-16
Filing date: 2015-10-16
Publication date: 2017-04-26

Abstract

The invention discloses a telescopic leg frame of linkage folding glasses, which is used for folding lenses and telescoping the leg frame of the telescopic glasses through the linkage of the transmission components. The transmission components and the guide components are matched by sliding friction. The transmission components comprise an elastic transmission part and a plurality of transmission parts. The shapes of fitting faces of the guide components are convex and concave. The transmission components pull and push the means of the movement of the ear hook component. The glasses have the advantages of convenient opening and closing and small size after being folded, and the leg frame has the advantages of simple structure, strong reliability and convenient process.

Description

Link the telescopic leg of foldable glasses

Technical field

The present invention relates to glasses, particularly a kind of telescopic leg of the foldable glasses that link.

Background technology

Chinese patent ZL2003101042516 discloses a kind of scheme of doldable spectacles, and publication number CN1611992A is public On May 2005 day 4 is opened, using folding and the flexible frame mode linked by driving member of leg support of eyeglass, is had Take up space after condensation little and folding with convenience the characteristics of.But the structure of its leg support is more complicated, and reliability is low.

The content of the invention

The present invention provides a kind of scheme of telescopic leg, and for the glasses of above-mentioned construction, and simple structure, technique is convenient, It is highly reliable.

Glasses leg support of the present invention each include pedestal component, tack component, driving member.It is provided with the pedestal component point The guide not worked in the two different runnings that stretch, the position that guide is located be the anterior of pedestal component or Person is at rear portion.Tack component is connected with pedestal component by sliding friction mating surface.Driving member with guide by matching somebody with somebody Close to change and drive after the direction of motion motion of tack component.The present invention adopt scheme be：It is sliding between driving member and guide Dynamic friction coordinates.

The scheme that can also be adopted is：The shape of guide mating surface or being shaped as of being arranged in be located at it is anterior forward, position In the protrusion backward or invaginated type at rear portion, driving member pulls or promotes the motion of tack component.The scheme that can be adopted also has： The position of guide of flexible two runnings is acted on equally in the front portion of pedestal component, or is similarly positioned in rear portion.Base The slideway for moving towards in front and back is provided with frame member, tack component is moved along slideway, the different piece of driving member is respectively along pedestal structure Two slideways arranged on part are moved in the opposite direction.Elastic transmission element and multiply driving member and set stack structure can be respectively Or together coordinate with above-mentioned each case and adopt.

The present invention by the way of sliding friction coordinates, install and safeguard by the manufacture for eliminating pulley.Because guide is not to turn Moving part, guide can be connected with pedestal component, one-shot forming.And above-mentioned fit system to be particularly suited for intensity big Cooperation i.e. between the big and thicker driving member of hardness and guide, is also more suitable for driving member and the elasticity constituted using multiply Driving member so that driving member can increased reliability more resistant to abrasion, extend service life.Elastic transmission element also more resistant to Impact, is more beneficial for preventing unexpected stress from going to pot.Guide mating surface is protrusion or invaginated type, and driving member prolongs in change Stretch transition during direction length can with longer, can be excessive it is gentler, can reduce resistance when running, also more Be adapted to using the big driving member of intensity, the particularly mating surface of guide be arc or when being arranged as arc can it is excessive more Uniformly, above-mentioned effect becomes apparent from.Using invaginated type guide, because mating surface is in inner side, therefore the shell of pedestal component is just Guide can be doubled as, structure is simplified, technique is facilitated.By the way of driving member push-and-pull transmission, half is reduced long The driving member of degree, while reducing connection and the difficulty installed；Due to being closely located to for guide, can be by whole guides It is integrally formed, for example, can makes the tubular body of a bending, driving member is placed in bend pipe and be capable of achieving function, because And structure is significantly simplify, facilitate technique.Using set stack structure, because driving member is engaged from from cross section Part surround and unexpected bending be less likely to occur, reliability is higher.In addition tack component can also be simplified using set stack structure Structure simplify the connection of tack component and pedestal component simultaneously.

The push-and-pull kind of drive and set stack structure also have a benefit, are not pens in slideway because tack component is only unidirectionally pind down The flexible of leg support still can run freely in the case of straight.So can have certain curved in the angle pedestal component overlooked Song, it is more identical with the shape of eyeglass so that more compact structure after whole mirror condensation.

Description of the drawings

Fig. 1, Fig. 2 are schematic diagram of the glasses leg support of example 1 in elongation condensation course intermediateness and with other part relations；

Fig. 3 is the elongation state of example 1 and the schematic diagram with other part relations；

Fig. 4 is the condensed state of example 1 and the schematic diagram with other part relations；

Fig. 5 is the schematic side view of example 1；

Fig. 6 is the A-A sectional views of Fig. 5；

Fig. 7 is the enlarged drawing of Fig. 6 local；

Fig. 8 regards schematic diagram for the vertical view of example 1；

Fig. 9 is B-B sectional views that Fig. 8 amplifies and local omission；

Figure 10 is the glasses leg support cross-sectional schematic of example 2；

Figure 11 is the cross-sectional schematic of example 3；

Figure 12 is the rear portion cross-sectional schematic of example 4；

Figure 13 is the rear portion cross-sectional schematic of example 5；

Figure 14 is the schematic side view of example 6；

Figure 15 is the front part schematic side view of example 7；

Figure 16 is the rear portion schematic side view of example 8.

Specific embodiment

Example 1

The leg support front portion that the pedestal component 1 of leg support is connected with the support element of glasses, is pedestal component near junction 1 front portion, rear portion is proximate at tack, as shown in Figure 8.Be provided with pedestal component 1 move towards in front and back respectively with motion Two slideways that the different part in direction coordinates, i.e. Passive part slideway 4 and driving link slideway 5.Slideway 4 is located at slideway 5 Top, vice versa.Due to the upper-lower height of pedestal component 1 can be bigger than left and right thickness it is many, position arranges up and down can be with Allow between above-mentioned two slideways has bigger distance than left and right arrangement, and driving member just can have during bearing of trend is changed It is more excessive.Slideway 4 is hollow form, and tack component 2 is placed among slideway 4, can move forward and backward.Slideway 4 and ear The composition set stack structure of hook component 2.Slideway 5 is also hollow form, and direction is extended in the longitudinal towards another leg support side one is provided with Bar gap 7.There is a slide block 8 to be placed in slideway 5, can move forward and backward.Arrange slide block can preferably connect driving member with The movement locus of pivot and control driving member.Also can by driving member directly with it is pivotally connected.Slideway 5 is also set with slide block 8 Stack structure, driving member 3 is also set stack structure with slideway 4 and 5, and the part being engaged with slideway from from cross section is in slideway Within the scope of surrounding.As shown in figure 9, device has guide 6 between the top of two slideway front portions, guide is set 6 purpose is extension and the direction of motion for changing driving member 3, and two slideways coordinate to control the movement locus of driving member, Driving member 3 is allowed to turn about 180 degree, its two ends can move in the opposite direction respectively along different slideways, so that Obtaining tack component 2 can move to required direction.Guide 6 has two mating surfaces of ab, is respectively acting on flexible two Different runnings, 6b faces position is forward, is the human eye sight direction i.e. invaginated type forward when wearing, and 6a faces are to lordosis Go out shape., slightly larger than the thickness or diameter of driving member, two mating surfaces are similar shape for the distance between 6a faces and 6b faces. Two mating surfaces respectively connect respectively the curved surface of two slideways for two ends, can be continuous whole curved surfaces, it is also possible to matched somebody with somebody by multiple Conjunction face rearranges.Guide and two slideways can constitute the U-shaped slideway toppled over.In side-looking angle, guide mating surface Shape can be arc, can also be a section of curve of rule, such as parabola or catenary etc., mating surface Can be symmetrical shape, the axis of symmetry of curve two with driving member different piece in single running are in opposite direction Trajectory is equidistant.The mating surface of guide is the symmetrical curved surface of rule or is conducive to reducing according to the symmetrical curved arrangement of rule Resistance during operation, other each cases of the invention are also such.The shape of the angle guide mating surface of forward sight it is then more neat more It is straight better.Driving member 3 and guide 6 are also set stack structure, that is, the part for moving with bearing of trend or required fortune Activity on the vertical direction in dynamic direction is limited within the scope of the part being engaged surrounds.As shown in figure 9, transmission Part 3 is the elongated thing that can bend, and its one end is connected with tack component 2, can extend along slideway 4, by with guide 6 Cooperation be changed into extend along slideway 5, the other end is connected with slide block 8.As shown in Fig. 7 and Fig. 1, the part of slide block from Pass in gap 7 on slideway 5, be connected with the connector being fixed on picture frame eyeglass by pivot.

In leg support elongation process, with the expansion of two eyeglasses, connected connector from the rear portion of pedestal component 1 anteriorly Motion, promotes driving member 3 to travel forward along slideway 5 by pivot band movable slider 8, and driving member 3 with guide through coordinating It is changed into being moved backward along slideway 4 after the mating reaction of face 6b, so as to promote connected tack component 2 to move backward, by ear Hook component 2 is ejected from slideway 4, realizes the elongation of leg support.In leg support condensation course, with the folding of two eyeglasses, Slide block 8 is moved backward, and Jing guide mating surfaces 6a of driving member 3 are led and pull back tack component 2 and travel forward, and realizes condensation. Driving member is moved along U-shaped slideway in running.When the way of propelling is operated, the upper mating surface of driving member and slideway 4 and The lower mating surface of slideway 5 coordinates.Slideway with the part being engaged is coordinated by sliding friction.

Due to the quality very little of tack component, as long as driving member has some intensity, itself can keep certain shape when being promoted Shape, can be delivered to the other end by the active force of very little from one end, and material such as metal-polymer material etc. can be achieved with pushing away The function of dynamic tack component motion.The cross section of driving member of the present invention can be various shape, can also be multiply group Into, the driving member that multiply is constituted can keep more flexible while intensity is improved.

Example 2

The guide 6 of this example is located at front and rear.It is forwardly convex shape positioned at front portion, is made up of two guides Oval arcuation mating surface.It is convex shape backward positioned at rear portion, is the guide of an oval arcuation mating surface.It is above-mentioned Oval short axle is equidistant with two in opposite direction trajectories of the driving member different piece in single running, guide Mating surface is symmetrical shape.3 points of driving member ab two parts.In leg support elongation process by driving member 3b part with Cooperation positioned at mating surface 6b of the guide at rear portion pulls tack component 2 to move.Then pass through driving member in the condensation process 3a parts pull tack component 2 to move with the cooperation of guide mating surface 6a.Driving member can use various flexible materials, Other are same using each case of pulling mode.To can be driven when driving member is the very big material such as fabric of flexibility Part 3 is directly connected to the connector for being connected lens frame, using the function of the flexible replacement pivot of driving member.Remaining and example 1 is roughly the same.

Example 3

The guide 6 of this example is all located at rear portion, i.e., at tack.The mating surface of guide is to be backwardly recessed and protrude Curved surface.The direction that the U-shaped of formation is toppled over is contrary with example 1.Tack component 2 is pulled to transport by driving member 3 when leg support extends It is dynamic, it is then to promote during condensation.The shape of guide mating surface is arc-shaped, and the guide for acting on different runnings coordinates Face 6a is the different concentric semicircles arc of radius with 6b, and 6a faces connect direction for interior, and 6b faces are circumscribed direction, and 6a faces position is leaned on Afterwards.Whole guides are the ducted body of an arc.Driving member 3 in slideway 4 with the location overlap of tack component 2, transmission Part is coordinated with the upper mating surface of slideway 4 indirectly by tack component.Therefore, no matter the size of tack component, entirely Portion's driving member can be limited in operation in most narrow space.Remaining is roughly the same with example 1.

Example 4

Guide mating surface can be irregular asymmetrically shaped, and as shown in figure 12, most concavo-convex place namely most locates rearward It is on the upper side.The front and back position of two ends of mating surface can have difference.Can also in the shape of the angle guide mating surface of forward sight It is somewhat curved.Remaining is roughly the same with example 3.Because the range of activity of driving member can will not with confined very little, driving member There is unexpected bending, the driving member that driving member can just adopt the relatively low material of the relatively low elephant hardness of intensity or size thinner is realized The function of promotion, that is, the flexibility of the confined less driving member of activity space of driving member just can be bigger.Driving member It is flexible bigger, the shape of guide mating surface also just can also be less with more samples, the distance between slideway 4 and slideway 5, The profile of leg support can have more selections.

Example 5

This example is located at the convex shape that the shape of the guide at rear portion is seemingly toppled over, and has plane on prominent position.Passive part slideway The end of 4 lower mating surface and the end of the upper mating surface of driving link slideway 5, i.e. in Figure 13 at 6b1 and 6b2 with transmission The frictional fit of part serves the effect of guide.In the case where being engaged with elastic transmission element, because elastic component is bent Shi Zishen can keep the movement locus of certain shape, driving member to be still curve, therefore the mating surface of guide and driving member It is made up of the face of four very littles of 6b1 to 6b4,6b1 to 6b4 is arranged as the shape protruded backward.With flexible big intensity Mating surface also includes the plane between 6b3 and 6b4 when low driving member coordinates.In the feelings that driving member is operated using pulling mode Under condition, the Telescopic that the shape of guide mating surface can have very many selections, leg support can be realized, in this example, At the only 6b1 and at 6b2 and in the case of other parts are non-existent, that is, the end of slideway also serves as guide, and does not have Telescopic still can be realized when having special guide.Remaining is roughly the same with example 2.

Example 6

As shown in figure 14, the guide that this example is located at rear portion is in the 6b1 and 6b2 near slideway end.It is anterior with There are guide 6a1 and 6a2 on 6b1 corresponding with 6b2 position.Guide is set before and after on pedestal component, transmission is allowed Part is moved around above-mentioned two parts guide, you can the movement locus of control driving member so that driving member has the motion rail at Mark from the front to the back while, in addition the track at from the front to the back, the function flexible to realize leg support.In the angle of forward sight, At the top of an above-mentioned trajectory and another trajectory end guide, i.e. between 6a1 and 6a2, that is, Driving member different piece the one of direction of trajectory in opposite direction stretched or contract in single running trajectory Top at and another direction trajectory end guide between, device on position more more forwardly of than 6a1 and 6a2 There is 6a3,6a1,6a2 and 6a3 are arranged as forwardly convex shape.Because anterior guide has the 6a3 on salient position, So that driving member can have more excessive during bearing of trend is changed, therefore be more suitable for using the big driving member of intensity, Namely driving member 3a parts more thick and stiff than 3b parts can be spent bigger.Guide is not rotated, and is sliding between driving member Dynamic friction coordinates.

4 points of the Passive part slideway of the operation of this example tack component 2 is two parts, and 4a parts are on the side of pedestal component 1 The gap opened, the very short rear portion in pedestal component 1 of 4b partial-lengths and the composition set stack structure of tack component 2.4a part be for Raising reliability and set, in the case where only 4b parts are without 4a parts, the flexible and whole mirror of leg support is worn Function still can be realized.And the purpose for arranging slideway 5 is to prevent because misoperation causes driving member in non-extended direction Upper stress and go to pot, in the case of without driving link slideway 5, the Telescopic of leg support equally also can be realized.This example The side of guide can arrange block piece to prevent driving member from leaving guide to increase reliability, omit in figure.Remaining with It is roughly the same shown in LZ 2003101042516.

Example 7

This example acts on the guide of elongation process in front portion, there is the 6b1 positioned at Passive part slideway 4b ends and active The 6b2 of part slideway 5b ends, the end of above-mentioned two slideways coordinated with driving member doubles as guide.6b1's and 6b2 Position is respectively the end of in opposite direction movement locus line of the different piece of driving member in single running, works as guiding The mating surface of part be it is continuous whole in the case of be also mating surface two ends, 6b1 and 6b2 is referred to as terminal guide part, or The end of person's guide, front viewing angle terminal guide part mating surface be 6b1 and 6b2 projection between distance be guide end Portion's distance, is also the distance between slideway 4 and the end projection of slideway 5 in this example.At the plane for above extending up and down There can be 6b4.In the angle of forward sight, the position of 6b4 between 6b1 and 6b2 in the middle of position on, 6b4 and 6b1 or The distance of 6b2 projections is about 1/the 2 of 6b1 and 6b2 projector distances；There can be 6b3 between 6b1 and 6b4, Can have 6b5 between 6b4 and 6b2,6b3 between 6b1 to 6b2 distance about 1/4th at, 6b5 in 6b1 extremely Between 6b2 at about 3/the 4 of distance, the distance between 6b3 and 6b5 projections are also about that 6b1 and 6b2 projects it Between distance 1/2nd.6b3,6b4 and 6b5 are located further forward and in the middle of between 6b1 and 6b2 than 6b1 and 6b2 Position.When guide is only made up of 6b1 and 6b2 plus tetra- parts of 6b3 and 6b5, or only added by 6b1 and 6b2 Tri- parts of upper 6b4 constitute, and are exactly than two terminal guide parts positioned at front portion more in the case of other local vacancies Device has guide on forward and close forward sight position middle therebetween, and the spacing that projection is regarded in face of guide cooperation is little In the case that the mating surface of 1/the 2 of threshold value, i.e. guide is arranged as invaginated type forward, with slightly resilient biography Moving part such as nylon tape coordinates, and promotes the function of tack component motion and just can realize.When guide adds 6b3 by 6b1 and 6b2 When constituting with tetra- parts of 6b5, the distance between adjacent guide is as between 6b3 and 6b5 or between 6b2 and 6b5 The value of distance is about 1/the 2 of the distance between 6b1 and 6b2 value or less, that is, guide coordinates interplanar distance Value is less than 1/the 2 of the value of guide threshold value.Prolong because the more remote guide in the distance between two slideway ends changes The length of transition just can be longer when stretching direction, and the intensity of driving member can be stronger, therefore the spacing of guide just can be more Greatly.And the less reliability of the more complete spacing of guide mating surface is higher.As shown in figure 15, when by 6b1 to 6b5 five When part constitutes, reliability is higher, and the value of spacing less than the value of threshold value 1/4th when, or the value of spacing is It is higher when below the value of 5 times of driving member thickness, without highest during spacing.Guide can be rearranged by multiple, multiple The mating surface of guide is located at anterior curve prominent forward by the mating surface that one section of two ends are terminal guide parts between two ends Arrangement.The mating surface of guide arrangement can constitute the U-shaped slideway toppled over slideway 4 and 5.Above-mentioned curve is guide Position can be arc, it is possibility to have deformation, such as be rearranged by some curved surfaces and plane, can be irregular shape Shape.The shape of guide mating surface can also be change, such as this example, because the end of two slideways also serves as guide And slideway has extension, therefore the front and back position of terminal guide part 6b1 and 6b2 not only can be with other guide positions Arrangement it is different and different, but also can because during driving member stress deformation extent different and change.Guide mating surface Spacing as driving member deformation extent is different and change.Affect the intensity, the elasticity that have a driving member of driving member deformation extent Strong and weak and operation speed also has change of frictional force etc. between part.Above-mentioned guide mating surface shape irregular and Although not interfering with the realization of guide function, the raising to leg support and whole glasses performance is unfavorable. Therefore it is preferably provided special terminal guide part to determine the front and back position of mating surface.And shape is by the symmetrical curve row of rule Row, or the curved surface that rule is symmetrical, resistance when particularly shape is run closer to semi arch is less.In the angle of forward sight, With the connecting line of the identical whole intermediate points of each guide mating surface or so width as straight line preferably, that is, arrange more Neat more straight better, guide threshold value also refers to air line distance.

The guide that this example works in the condensation process is similarly positioned in front portion, due to being worked when pulling mode is run, The quantity of guide and the selection of position are very more, can realize its function, but work as and invaginated type guide position Have guide on corresponding position, that is, for corresponding convex shape when, the range of activity of driving member can be had preferably Limit and be conducive to the raising of performance.As shown in figure 15, the position of two parts guide corresponds.Concavity is led with convex Shape to the mating surface of part is more identical, and the spacing between the mating surface of each guide is less, and the restriction to driving member is got over Many, the more abundant reliability of restriction is higher, and the shape of guide mating surface also can just have the deformation of more degree, position It is most forward with the movement locus line of driving member or most locate rearward, that is, the turning point of front and back position can be with more deviations Between position, be asymmetrically shaped.In fig .15, when guide is made up of tri- parts of 6b1,6b2,6b4, turn Be to be at folding at 6b4 places at about 1/the 2 of threshold value, i.e., on middle position, and example 4, such as Figure 12 Shown, turning point is then at about 1/the 5 or about 4/5ths of guide threshold value.But, deformation is got over The resistance of big operation is bigger, and guide is got over for excessive segment length when driving member is turned to that increases that standing shape plays a part of It is little, in the case where guide is only convex shape if example 2 and example 6 are also such.

Driving link slideway 5 can be divided into 5a and 5b two parts, and 5a parts are the gaps opened on the side of pedestal component 1, operation with The part of the connection of driving member 3.5b parts coordinate in the plane being located below with driving member.Two parts of Passive part slideway 4 are all In plane located above, construction is similar with slideway 5, and position is then identical.The different piece of driving member is not respectively along Same slideway is moved in the opposite direction.Slideway is higher to the more reliabilities of range of activity restriction of driving member, as slideway 4b Bottom and the top of slideway 5b can increase reliability when having stop, reliability can be also increased when also there is stop guide side Property, omit in figure.In addition, if being also beneficial to improve reliability using banding driving member.The part of this example motion with The cooperation of slot-shaped slideway is roughly the same with example 6, and remaining is roughly the same with example 1.

Example 8

The guide that this example acts on elongation process is identical with example 7, is oriented to including convex shape as shown in figure 15 but not The part of part, and have driving member 3a parts to be connected with tack component 2.The guide for acting on condensation course is then located at rear portion, As shown in figure 16, the shell at the rear portion of pedestal component 1 also serves as guide.More leaning on than two terminal guide parts positioned at rear portion Afterwards and near forward sight therebetween in the middle of position on device have guide, guide mating surface is arranged as being backwardly recessed shape. Guide mating surface is rearranged by plane and curved surface, is irregular shape.In elongation process driving member 3b be located at The guide 6b of anterior invaginated type forward coordinates, and promotes tack component 2 to move.In the condensation process then by another part biography Moving part 3a parts coordinate with the guide 6a for being backwardly recessed shape positioned at rear portion, are also to promote tack component 2 to move.Remaining It is roughly the same with example 7.This example slideway 4 and slideway 5 also respectively can cover stack structure with the part composition being engaged, and Reliability is higher.

The limitation of activity of this example driving member is less, therefore driving member should have certain elasticity, is capable of achieving using nylon tape Its function, and to be advisable using the driving member with strong elasticity as steel band.The driving member when the spacing of guide is larger of example 7 Also there is certain elasticity.It is less in spacing, under being such as smaller than less than 2 times of driving member thickness, and slideway 4b In the case that stop is arranged at the top of portion and slideway 5b, function can also be realized using the very low driving member of elasticity.But it is elastic Low driving member easily goes to pot when there is unexpected bending, and reliability is low.The range of activity of driving member is restricted more greatly fewer The elasticity of driving member just should be stronger.And driving member be restricted it is more many be just less susceptible to unexpected bending, elasticity also just can be with It is lower, such as example 3 and example 4, in the case where the no elasticity of driving member is for example with copper wire its work(can be also reliably achieved Can, example 1 is also such in the case where the narrow tack component of slideway is relatively thin.Due to elastic component impact resistance, meaning can be prevented Outer stress goes to pot, and each case of the invention can adopt elastic transmission element to improve reliability.

Claims

1. a kind of telescopic leg of the foldable glasses of linkage, includes pedestal component, tack component, driving member；On the pedestal component The guide for working in the two different runnings that stretch respectively is provided with, the position that guide is located is pedestal structure Part anterior or at rear portion；It is connected by sliding friction mating surface between tack component and pedestal component, driving member Changed by the cooperation with guide and drive after the direction of motion motion of tack component；Characterized in that, driving member and guiding It is sliding friction cooperation between part.

2. the leg support described in a Ju claim 1, it is characterised in that the shape of guide mating surface or be arranged in be shaped as position Move forward, positioned at the protrusion backward or invaginated type at rear portion, driving member pulling or promotion tack component in anterior.

3. the leg support described in a Ju claim 2, it is characterised in that the position for acting on the guide of flexible two runnings is same Sample is in the front portion of pedestal component, or is similarly positioned in rear portion；The slideway for moving towards in front and back, ear are provided with the pedestal component Hook component is moved along slideway, and two set along pedestal component respectively slideways of the different piece of driving member are to contrary side To motion.

4. the leg support described in a Ju claim 3, it is characterised in that guide mating surface is arranged as invaginated type, the value of its spacing Less than 1/the 4 of the value of guide threshold value；Guide mating surface or the mating surface of arrangement and two slideway compositions The U-shaped slideway toppled over.

5. the leg support described in one of Ju claim 2 to 4, it is characterised in that the shape of guide mating surface is arranged in It is shaped as arc.

6. the leg support described in one of Ju Claims 1-4, it is characterised in that driving member is elastic component.

7. the leg support described in one of Ju Claims 1-4, it is characterised in that the part composition being engaged by sliding friction Structure includes set stack structure, or entirely set stack structure.

8. the leg support described in one of Ju Claims 1-4, it is characterised in that driving member is made up of multiply.

9. the leg support described in a Ju claim 5, it is characterised in that driving member is elastic component.

10. the leg support described in a Ju claim 9, it is characterised in that the structure of the part composition being engaged by sliding friction is included There are set stack structure, or entirely set stack structure.