CN101016918A

CN101016918A - Ball chain

Info

Publication number: CN101016918A
Application number: CN 200610002857
Authority: CN
Inventors: 许明哲; 陈丽芬
Original assignee: Chieftek Precision Co Ltd CPC
Current assignee: Chieftek Precision Co Ltd CPC
Priority date: 2006-02-07
Filing date: 2006-02-07
Publication date: 2007-08-15
Anticipated expiration: 2026-02-07
Also published as: CN100580264C

Abstract

A ball chain is composed of a row of a plurality of balls arranged in tandem and an axially extending spacing chain; the spacer chain provides a plurality of pockets arranged one behind the other in which the balls are located. The spacing chain comprises a plurality of spacing blocks which are arranged in a front-back manner, and the spacing blocks are positioned between the balls to space the balls in pairs; at least two axially extending elongated elastic bands and a transversely extending elastic connecting strip. The two ends of the elastic connecting strip are connected with the elastic belt, and the middle of the elastic connecting strip is elastically connected with the spacing block; the elastic connecting strip is kept to have the maximum length and enough elasticity, and can be more freely bent forwards, backwards, leftwards and rightwards, and the spacing block can also rotate and incline in various directions relative to the elastic connecting strip through the elastic connection. This ball chain thus has sufficient freedom to run smoothly with little resistance in a three-dimensional change of direction circulation path.

Description

Ball chain

Technical field

The present invention is ball chain design, is used in the linear motion mechanism as ball screw linear slide rail, sliding sleeve etc.; Constituted by many tandem balls of row and an axially extended spacer chain; Spacer chain is separated by ball in twos and is remained in the spacer chain; Ball chain can be along low noise on the track of three dimensional space bending extension, lower resistance and operation reposefully.

Background technique

In one motion, a movement parts and a guide member are arranged; There is the track of at least one row to align mutually on movement parts and the guide member, a plurality of ball rolling-operations of row and a transfer charge all arranged on the track of every row pairing; Movement parts also provides the return flow line and slalom course is connected with track, and forms the circulation channel; Ball circular flow in the circulation channel makes movement parts move with being able to not restrict driving journey on guide member.For avoiding colliding mutually between the ball generation, in No. the 5927858th, U. S. Patent, between ball, provide the design of spacer block with reduce wear and noise; Because the gap between spacer block and the ball makes spacer block tilt easily, skew causes and can't move smooth-goingly and interfere with each other with the circulation channel.

At U. S. Patent the 5947605th, wait for No. 6155718 and disclose the design of ball connection chain, the ball connection chain has the elongate strip of two axially-aligned and spacer block is coupled together in the axially-aligned mode, ball is placed between the spacer block and is held, because the ball connection chain becomes the prolate strip, pliability by the prolate bar, the ball connection chain can be unhinderedly crooked perpendicular to plane that is made of two elongate strip that is flat direction (being designated hereinafter simply as ball connection chain face), but in Vertical direction bigger rigidity is arranged, can produce resistance during toward this direction bending.This design so the channel that only is suitable for circulating are positioned on the plane of vertical ball connection chain face fully, also reach ball connection chain curving movement on two-dimensional space.When the circulation channel was not exclusively on this plane, the ball connection chain must also reach the resistance that must overcome toward the Vertical direction bending toward favouring the bending of ball connection chain face direction, and this design therefore will produce impedance and operation has some setbacks.

For overcoming the linear motion mechanism of circulation channel not on ball connection chain vertical surface the time, design as ball screw and some linear slide rails, U. S. Patent the 5th, in 593, No. 064 disclosed designs, provide a ball connection strap, the ball that has comprised one one-tenth row is arranged in the predetermined interval, one connecting band is prolonging the circular appearance of ball by four elongated shape subbands and is constituting, and these also are interconnected between the ball in the elongated shape subband, and the joint is compared down with ball diameter and become to dwindle shape.Because ball is surrounded by four subbands in being remained on completely, become to dwindle shape in addition in the joint, thereby ball connection strap more freely bending and rotation distortion herein, therefore, this design provides the ball connection strap more anfractuose degrees of freedom, thereby is able to operation reposefully in the linear motion mechanism when the circulation channel is not on ball connection chain vertical surface.These four circular shapes of elongated shape subband just can be positioned at the guide groove that the circulation channel is provided and only be positioned at head portion; Because the circulation channel is a case type loop, be to constitute by the parts more than at least two, thereby the junction arranged, the junction can produce the deviation that does not align, therefore each ball passes in and out this junction, the guide groove that four elongated shape subbands of ball connection strap must be provided the direct circulation channel again, thereby cause easily and block the situation that has some setbacks; On the other hand, as the junction of interval ball function, but for keeping its flexible and warping property the smaller the better, also therefore the area that contact with ball of junction reduces and increase is worn and torn, and is unfavorable for the life-span of ball connection strap; Also or the longer the better in the junction, also therefore will increase the distance between the ball and reduce load carrying capacity.

Similarly at U. S. Patent the 6th, 247, in the 846B1 number disclosed design, provide a rolling element to keep spacer block, comprised that one keeps partly, become a circular arc and between two rolling elements in both ends of the surface; And bent part, connecting a pair of maintenance partly, rolling element then is positioned at wherein.Via the bending of bent part, a pair of maintenance of connection partly can be tilted mutually; Rolling element keeps independent mutually between the spacer block on the other hand, thereby can be when rolling element be turned, angle between can adjusting keeps spacer block not move required degrees of freedom reposefully on the circulation channel is not positioned at linear motion mechanism on the ball connection chain vertical surface to reach rolling element.Because each rolling element keeps in the spacer block isolated operation circulation channel, when each rolling element keeps spacer block turnover junction, the guide groove that must be provided the direct circulation channel again, thereby cause easily and block the situation that has some setbacks.

Summary of the invention

The objective of the invention is to, provide ball chain design to have enough curved incline degrees of freedom, can use the linear motion mechanism when the circulation channel favours on the ball connection chain vertical surface, as the design of ball screw and some linear slide rails, low noise, lower resistance and smooth-going the operation.Design of the present invention provides a ball chain according to above-mentioned purpose, and ball chain is by many tandem balls of row, and an axially extended spacer chain constitutes; Spacer chain provides a plurality of tandem potholes, and ball is located in wherein.Spacer chain has comprised a plurality of tandem spacer blocks, and spacer block is separated by between ball and with ball in twos, avoids collision; Article two, extend axially leptosomatic elastic strip and comprise horizontal expansion elasticity linking strip, elasticity linking strip two ends link elastic strip and do the elasticity binding in neutral position and spacer block; Link horizontal expansion elasticity linking strip by elasticity, can have maximum length and enough elasticity, can be more freely crooked all around, link spacer block via elasticity and can also do all directions rotation inclination with respect to tie point, simultaneously, spacer block can be not more than under the ball diameter design and ball have bigger surface of contact with reduce with ball connect place's pressure, spacer block has the groove of allowing in addition, its size enough allows the elasticity linking strip can not interfere with it under required bending.

Have a guide groove in the circulation channel at least, ball chain extends axially leptosomatic elastic strip position then in groove, by the guiding ball chain of groove, is parallel to guiding face that guide groove constitutes and moves along the circulation channel in the circulation channel; The vertical surface of its guiding face at grade when the circulation channel is crooked, then leptosomatic elastic strip only needs along guiding face, curving movement in two-dimensional space, elasticity by the slender type elastic strip, ball chain is promptly can be at an easy rate crooked, to reach cyclic track medium or low resistance power and smooth-going the operation.

The vertical surface of guiding face is not at grade when the circulation channel is crooked, and displacement is arranged, during inclination, design as ball screw and some linear slide rails, when ball chain moves in this circulation channel, also must be along the bending simultaneously of circulation channel and displacement or inclination, and in three dimensional space curving movement; Also therefore must do corresponding bending and displacement or inclination between elastic strip and the connection strap, the opposite position and the direction of then still necessary maintenance of spacer block this moment and ball make that therefore spacer block and ball surface of contact are able to keep aligning with ball; Since elastic strip, different correspondence between connection strap and the spacer block three, thereby when operation, must be able to produce the relative position change.Because the elasticity of elastic strip and connection strap itself and and spacer block between the elasticity binding, make the position between the three under lower resistance, to do resiliently deformable, with the corresponding bending required between reaching in three dimensional space in the curving movement and the freedom of displacement or inclination; Therefore also spacer block can be between ball, along with and be aligned with the ball operation, the slender type elastic strip then is positioned at the guide groove that the circulation channel is provided, with keep ball chain along the groove guiding face in the circulation channel reposefully operation be achieved.

Description of drawings

Fig. 1 is linear slide rail design, the return flow line elevation cross-sectional view on loading zone ball spacer chain vertical surface T1 not in the channel that wherein circulates;

Fig. 2 is the A-A sectional drawing of Fig. 1;

Fig. 3 a is the disclosed spacer chain design of the present invention return flow line in Fig. 1, the front view when slalom course and loading zone channel; Fig. 3 b is Fig. 3 a G-G direction view;

Fig. 4 a is the disclosed spacer chain design of the present invention return flow line in Fig. 1, the top view when slalom course and loading zone channel; Fig. 4 b is Fig. 4 a D-D direction view; Fig. 4 c is Fig. 4 a E-E direction view;

Fig. 5 is first kind of embodiment's of the disclosed spacer chain design of the present invention a front view, b left view, c F-F cross section view, d top view, e K-K cross section view, f angled view;

Fig. 6 is second kind of embodiment's of the disclosed spacer chain design of the present invention a front view, bL-L cross section view, the enlarged view N of the thin portion of c, d M-M cross section view, e angled view;

Fig. 7 is the third embodiment's of the disclosed spacer chain design of the present invention a front view, b left view, the enlarged view R of the thin portion of c, d P-P cross section view, e Q-Q cross section view, f angled view;

Fig. 8 is the 4th kind of embodiment's of the disclosed spacer chain design of the present invention a front view, b left view, c U-U cross section view, d V-V cross section view, e H-H cross section view, f angled view;

Fig. 9 applies to the ball screw design for the disclosed ball spacer chain design of the present invention, and a ball chain moves schematic representation in ball screw, b W-W cross section view, the thin portion of e O enlarged view, second kind of embodiment's of d spacer chain design front view.

[figure number explanation]

Movement parts 01,110, guide member 02,120, ball chain 03,130, track 11,21,111,121, return flow line 12, slalom course 13, circulation channel 15, guide groove 16, track 21,

spacer chain

30,40,50,60,70,

ball

31,41,51,61,71,

spacer block

32,42a, 42b, 52a, 52a, 62a, 62b, 72a, 72b,

elastic strip

33,43,53,63,73,

elasticity linking strip

34,44,54,64,74, ball surface of

contact

35,45,55,65, allow groove 56, arcuation elasticity linking strip 46, linking block 48 in conjunction with bar 68, holds ball space 49 spacer chains, and two ends are spacer block 142a independently, 142b.

Embodiment

One motion design linear slide rail as shown in Figures 1 and 2; Comprise a movement parts 01, one guide member 02, and the ball chain 03 of multiple row; Provide multiple row axially extended track 11 on the movement parts, being adjacent to track 11 sides has an about axially extended return flow line 12, and track 11 and 12 two ends, return flow line are imported and exported each and are connected by single-revolution road 13; Corresponding to also providing a track 21, the track on the movement parts 11 forms a loading zone channel 14 on the guide member 02; Return flow line 12, slalom course 13 and loading zone channel 14 have formed a circulation channel 15; Ball chain 03 is made of many tandem balls 31 of row and an axially extended spacer chain 30, and spacer chain 30 provides a plurality of tandem potholes, and ball 31 is located in wherein and be separated by in twos and keep.Ball chain 03 circular flow in circulation channel 15, ball 31 in loading zone channel 14, bear the load and at track 11, roll in 21, revolution and reflux return flow line 12 in and form a shuttling movement in slalom course 13, movement parts 01 are also so be able on guide member 02 along the liftoff operation of track 21 infinities.Circulating as shown in Figure 1 has guide groove 16 in the channel 15, guide groove 16 has constituted guiding face H1 in the loading zone channel, in return flow line 12, constitute H2, for making return flow line 12 that the optimal design position can be arranged, return flow line 12 not necessarily will be on the vertical surface T1 of guiding face H1, and ball 31 central points and the track 11 of return flow line 12, the formed plane C1 of ball 31 central points in 12 and the vertical surface T1 of guiding face form an angle Φ 1, so the vertical surface T3 of the vertical surface T1 of loading zone channel guiding face and return flow line guiding face produces displacement.As Fig. 3, Figure 4 shows that ball chain 03 changes front elevation and the top view and all directions view of return flow line 12 over to through slalom course 13 from load channel region 11,12.Ball chain spacer chain 30 has comprised a plurality of tandem spacer blocks 32, and spacer block 32 is between ball 31, and spacer block and ball surface of contact 35 keep aligning with ball 31; Extend axially leptosomatic elastic strip 33 and horizontal expansion elasticity linking strip 34.Elastic strip 33 is positioned at circulation channel guide groove 16, and along guide groove 16 operation as shown in Figure 1, so elastic strip 33 and elasticity linking strip 34 and circulation channel groove guiding face H are on same plane; X-axis shown in the direction view G-G is the direction along spacer chain 30 operations, Y-axis is the direction that spacer chain guiding face H goes up vertical X-axis, the Z axle is the direction of perpendicular separation chain guiding face H, and XYZ axle and spacer chain guiding face H are along with the guide groove 16 of circulation channel is crooked and crooked; When ball chain spacer chain 30 load channel region 14 during with return flow line 12 elastic strip 33 orthogonal with elasticity linking strip 34, and spacer block 32 is parallel to each other with elasticity linking strip 34; In the time of in ball chain spacer chain 30 enters slalom course 13 elastic strip 33 and elasticity linking strip 34 on the Z axle mutually rotation tilt at angle Φ 3 as shown in Figure 3, simultaneously spacer block 32 and elasticity linking strip 34 on the Z axle mutually rotation tilt at angle Φ 4 shown in Fig. 4 direction view E-E, and on the Y-axis mutually rotation tilt at angle Φ 5 as shown in Figure 4 and on X-axis mutually rotation tilt at angle Φ 6 shown in direction view D-D; Because elastic strip 33 runs parallel in circulation channel 15 with ball row 31, when elasticity linking strip 34 is parallel to each other on the spacer chain guiding face, angle Φ 3 is identical with the vertical surface T1 angulation Φ 1 of formed plane C1 of loading zone channel ball central point and guiding face with return flow line shown in Figure 1 ball central point, simultaneously because spacer block is aligned with ball row 31, so also identical with angle Φ 4; Therefore the displacement that produced of the vertical surface T3 of the vertical surface T1 of loading zone channel guiding face and return flow line guiding face is big more as shown in Figure 1, and ball chain spacer chain 30 is at Φ 3, and the required degrees of freedom of Φ 4 angle tilts is big more.

Produce above-mentioned distortion at an easy rate and keep lower resistance to move smooth-goingly for making ball chain spacer chain 30 enter slalom course 13, be illustrated in figure 5 as first kind of embodiment of the present invention; One ball chain spacer chain 30 has comprised and extends axially leptosomatic elastic strip 33 and comprise horizontal expansion elasticity linking strip 34, a plurality of tandem spacer blocks 32, spacer block 32 is between ball 31, and to arrange the adjacent face 35 of ball 31 with front and back be arc surface, and this arc surface diameter is similar to ball diameter; Wherein junction 36 sizes of spacer block 32 and elasticity linking strip 34 are less than the diameter of spacer block, because the rigidity that has reduced between spacer block 32 and the elasticity linking strip 34 of dwindling of junction 36 also reaches and has increased elasticity, make that spacer block 32 and elasticity linking strip 34 can lower resistance ground resiliently deformables and reach as shown in Figure 3 on the Z axle Φ 4 at angle that tilts of rotation mutually, and on the Y-axis mutually rotation tilt at angle Φ 5 and on X-axis the rotation Φ 6 at angle that tilts mutually; Junction 36 dwindles simultaneously, the length and the elasticity of elasticity linking strip 34 have been increased, on the other hand, leptosomatic elastic strip 33 and horizontal expansion elasticity linking strip 34 junction 36 are similar to the size of elastic strip 33 sectional areas, make elastic strip 33 and elasticity linking strip 34 can lower resistance ground resiliently deformable and reach on the Z axle Φ 3 at angle that tilts of rotation mutually, ball chain spacer chain 30 is the more easily guiding face operation that constitutes of lower resistance ground guide groove in the circulation channel therefore; The size of junction determines along with the big or small required elasticity of tilt angle Φ 3.

Figure 6 shows that second kind of embodiment of the present invention, one ball chain spacer chain 40 has comprised and has extended axially leptosomatic elastic strip 43, horizontal expansion elasticity linking strip 44 and a plurality of

tandem spacer block

42a, 42b,

spacer block

42a, 42b is between ball 41; Spacer block 42a wherein, the elasticity junction 46 of 42b and elasticity linking strip 44 is made of an elasticity horizontal stripe 47, elasticity horizontal stripe 47 passes the plane H that is constituted in elastic strip 43 and elasticity linking strip 44, two ends link by plane H and are divided into independently two

spacer block

42a, 42b, the centre then links elasticity linking strip 44; Two independently to arrange ball 41 adjacent faces 45 be that its diameter of arc surface is similar to ball diameter spacer block and front and back, the flexible spacer block 42a that more increased by elasticity horizontal stripe 47, elastic deformability between 42b and the elasticity linking strip 44 has reduced as shown in Figure 3 ball chain spacer chain 40 simultaneously and has entered slalom course 13 and produce resistance and reach smooth-goingly and move.The spacer block 142a at ball chain spacer chain 40 two ends, the exterior edge face of 142b each by a linking block 48 with two spacer block 142a independently, 142b connects to one, spacer block 42a, the space 49 that holds ball between the 42b is similar to the size of ball 41; When have living space 49 when all filling ball 41, all two spacer block 42a independently, 42b will be limited by ball 41 and can't arbitrarily open outward, the channel 15 of can therefore avoiding and circulate produces interferes.With extend axially the elasticity linking strip that leptosomatic elastic strip 43 two ends join and become camber shape 46 to shrink back backward, make linking block 48 become the guiding block at ball chain spacer chain 40 two ends.

Figure 7 shows that the third embodiment of the present invention, one ball chain spacer chain 50 has comprised and has extended axially leptosomatic elastic strip 53, horizontal expansion elasticity linking strip 54 and a plurality of

tandem spacer block

52a, 52b,

spacer block

52a, 52b is between ball 51, independent two interblock spacer block 52a before and after being divided into by the vertical surface S on the plane that is constituted through elasticity linking strip 54 and with elastic strip 53 and

elasticity linking strip

54,52b, the unique spacer piece of front is adjacent with the ball 51 of front, the unique spacer piece of back is adjacent with the ball 51 of back, adjacent face 45 is the approximate ball diameter of its diameter of arc surface, two unique spacer piece 52a, it is one to be made of elasticity horizontal stripe 57 that the elasticity of 52b and elasticity linking strip 54 links, elasticity horizontal stripe 57 pass plane H that elastic strip 53 and elasticity linking strip 54 constituted at two ends each and two unique spacer piece 52a, the end of 52b links, the centre then links with elasticity linking strip 54, two unique spacer piece 52a, enough grooves 56 that allows are arranged between 52b and the elasticity linking strip 54, allow spacer block 52a, can not produce when 52b tilts and interfere with elasticity linking strip 54; By the flexible spacer block 52a that more increased of elasticity horizontal stripe 57, the elastic deformability between 52b and the elasticity linking strip 54 has reduced as shown in Figure 3 ball chain spacer chain 50 simultaneously and has entered slalom course 13 and produce resistance and reach smooth-goingly and move.

Figure 8 shows that the 4th kind of embodiment of the present invention, one ball chain spacer chain 60 has comprised and has extended axially leptosomatic elastic strip 63, horizontal expansion elasticity linking strip 64 and a plurality of

tandem spacer block

62a, 62b,

spacer block

62a, 62b is between ball 61; Spacer block 62a wherein, it is to be made of an elasticity horizontal stripe 67 that the elasticity of 62b and elasticity linking strip 64 links, elasticity horizontal stripe 67 passes the plane H that is constituted in elastic strip 63 and elasticity linking strip 64, two ends link by plane H and are divided into independently two

spacer block

62a, 62b, the centre then links elasticity linking strip 64; Two spacer block 62a independently, it is the approximate ball diameter of its diameter of arc surface that ball 61 adjacent faces 65 are arranged in 62b and front and back, wherein for avoiding

spacer block

62a, 62b outwards opens and causes outer rim to produce interference greater than ball 61 diameters with circulation channel 15, two spacer block 62a independently, 62b is integral by at least one combining in conjunction with bar 68; By the flexible spacer block 62a that more increased of elasticity horizontal stripe 67, the elastic deformability between 62b and the elasticity linking strip 64 has reduced as shown in Figure 3 ball chain spacer chain 60 simultaneously and has entered slalom course 13 and produce resistance and reach smooth-goingly and move.

One motion design ball screw as shown in Figure 9; Comprise the movement parts 110 1 pole shape guide members 120 of a ring-type and the ball chain 130 of at least one row; Movement parts provides at least one row helical axially extended track 111 on the ring-type endoporus, be adjacent to track 111, also one helical track 121 is provided and forms a loading zone channel 140 and extend axially in a spiral manner corresponding to the track on the movement parts 111 on the guide member 120 in pole shape cylindrical; Ball chain 130 is by many tandem balls 71 of row and an axially extended spacer chain 70, constituted by second kind of embodiment of the present invention, spacer chain 70 provides a plurality of tandem potholes, and ball 71 is located in wherein and be separated by in twos and keep.When movement parts 110 rotations, along 121 operations of guide member helical track, therefore movement parts 110 also is able to axially operation on guide member 120 by ball chain 130.Ball chain spacer chain 70 is made an appointment with in line when free state, when in 140 operations of loading zone channel then is helical, the vertical surface that is same as guiding face when wherein circulating the channel bending in linear sliding track mechanism is not design at grade, ball chain is in the situation of revolution channel region, as shown in Figure 3, extend axially leptosomatic elastic strip 73 between movement parts 110 ring-type endoporus and guide member 120 pole shape cylindricals and be guided, so 72 maintenances of spacer block align with ball 71 parallel with elastic strip 73, elasticity linking strip 74 and elastic strip 73, the spacer block 72 so the Φ 3 at angle that tilts mutually, Φ 4; Along with the increase or the minimizing angle Φ 3 of pitch, Φ 4 also can be along with increasing or reducing.Second kind of embodiment of the present invention as shown in Figure 6 is flexible by elasticity horizontal stripe 77, reaches mutual inclination Φ 4 at angle and increased the elastic deformability between spacer block 72 and the elasticity linking strip 74 and be able to lower resistance; Junction 76 sizes also have elastic strip 73 and elasticity linking strip 74 junction to be similar to the size of elastic strip 73 sectional areas much smaller than the length that therefore diameter of spacer block has increased elasticity linking strip 74 on the other hand, elastic strip 73 is with elasticity linking strip 74 thereby be able to lower resistance and reach mutual inclination Φ 3 at angle, second kind of embodiment's spacer chain, 70 designs therefore of the present invention can be in the motion design medium or low resistance power ground of ball screw, operation reposefully.

Claims

1, a kind of ball chain, mainly comprise a plurality of tandem balls of row and an axially extended spacer chain, wherein spacer chain has comprised two axially extended elastic strips, and the elasticity linking strip of a plurality of horizontal expansions and elastic strip formation binding, between the two elasticity linking strips, define and form the pothole of axially-aligned, and ball is located between this pothole; And a plurality of tandem spacer blocks, spacer block is separated by between ball and with ball in twos, and wherein this spacer block and elasticity linking strip form and link; Its junction is less than the diameter of spacer block.

2, ball chain design as claimed in claim 1, the wherein binding of this spacer block and elasticity linking strip, be to comprise by one toward the horizontal stripe that extends perpendicular to two directions on plane that spacer chain forms by the junction, the horizontal stripe two ends link and respectively to link a spacer block independently, be connected by horizontal stripe and elasticity linking strip, and form spacer block and the binding of elasticity linking strip indirectly.

3, ball chain as claimed in claim 1 design, wherein this spacer block is spaced apart chain and divides into two spacer blocks independently.

4, ball chain design as claimed in claim 3, wherein the opposing side of two spacer blocks forms parallel with two planes that spacer chain forms.

5, ball chain design as claimed in claim 3, wherein the opposing side of two spacer blocks forms vertical with two planes that spacer chain forms.

6, ball chain as claimed in claim 4 design, wherein each is adjacent with a ball for this each spacer block.

7, ball chain as claimed in claim 6 design, wherein horizontal two unique spacer pieces were integral via at least one being connected in conjunction with bar, and should link two unique spacer pieces along the periphery of spacer chain in conjunction with bar.

8, as Shen claim 1,2 or 3 described ball chain designs, wherein the face that this spacer block and ball are adjacent is an arc surface.

9, as claim 1,2 or 3 described ball chain designs, wherein the diameter of this spacer block is approximately suitable with ball diameter.

10, ball chain as claimed in claim 1, wherein the tie point size of the elasticity linking strip of horizontal expansion and elastic strip is similar in appearance to the size of elastic strip sectional area.