JP2009144902A - Expansion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an expansion device having a small number of components, a simple structure, high strength, and excellent durability. <P>SOLUTION: This expansion device includes: a first extension member 1; a second extension member 2 extending in the same direction as the first extension member 1; a moving body 11 arranged between the first extension member 1 and the second extension member 2 and relatively moving in a longitudinal direction where the first and second extension members extend; a plurality of rolling elements 15 arranged between the first extension member 1, the second extension member 2, and the moving body 11; first load rolling element rolling contact passages 26, 37 formed by the first load rolling element rolling contact surfaces 12a, 12d of the moving body 11 and the rolling element rolling contact surfaces 1a, 1b of the first extension member 1; second load rolling element rolling contact passage 27, 36 formed by the second load rolling element rolling contact surfaces 12b, 12c of the moving body 11 and the rolling element rolling contact surfaces 2a, 2b of the second extension member; and rolling element direction changing passages 46, 47, 56, 57 formed at both ends of the moving body 11 and connecting the first and second load rolling element rolling contact surfaces. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a telescopic device such as a telescopic guide or a telescopic spline.

  2. Description of the Related Art Conventionally, furniture, OA equipment, machine tools, and the like are known in which an extension guide such as a slide rail is provided to slide the drawer or tool. Such a telescopic guide is engaged so that the two rail members on the fixed side and the moving side face each other, and are relatively moved in the extending longitudinal direction to expand and contract. As this telescopic guide, for example, the one disclosed in Patent Document 1 is known.

  The slide rail of Patent Document 1 is provided with a plate-shaped intermediate rail between a fixed-side outer rail and a movable-side outer rail that extend in the same direction and are arranged to face each other. Further, a plate-like cage for holding a plurality of balls is provided between the intermediate rail and the intermediate rail.

  These members are combined and engaged so as to be relatively movable in the extending longitudinal direction. In other words, a cage is provided between the two outer rails and the intermediate rail to move them relative to each other in the longitudinal direction, so that the outer rail and intermediate rail on the fixed side, the intermediate rail and the movement are fixed. The outer rails on the side are smoothly moved relative to each other. The outer dimension of the intermediate rail in the longitudinal direction is substantially the same as the stroke length of the slide rail.

Further, Patent Document 2 includes a guide shaft and a cylindrical nut penetrating the guide shaft, and a plurality of balls are interposed between the guide shaft and the nut so as to roll relative to each other in the axial direction. A telescopic spline as a moving linear guide device is disclosed. This telescopic spline is provided with a loop-shaped endless track groove (infinite circulation path) for rolling the ball. The endless track groove is filled with the ball and held, and a load ball guide groove (load The circulation path) and the no-load ball guide groove (no-load circulation path).
Japanese Utility Model Publication No. 63-82819 JP-A-10-26135

  However, in the telescopic guide shown in Patent Document 1, a cage for holding a ball and an intermediate rail are provided as separate bodies, and these are each formed of a plate-like member. Accordingly, the number of parts constituting the telescopic guide is large and the structure is complicated, and it is difficult for the telescopic guide to secure sufficient strength against moments such as twisting.

Further, since the cage holds the ball in a substantially bare state, there is a problem that noise is likely to occur when the telescopic guide is moved. In addition, since the cage itself is exposed when the telescopic guide is extended, rolling may be hindered by dust or the like adhering to the held ball.
In addition, the intermediate rail is required to have substantially the same dimensions as the stroke length, and it is difficult to save space.

  Moreover, in the expansion / contraction spline of patent document 2, the ball which exists in an unloaded circulation path among the infinite circulation paths holding a ball | bowl is in this unloaded circulation path for rolling in the following loaded circulation path. Is not used for rolling for relative movement between the nut and the guide shaft. However, in order to smoothly move the nut and the guide shaft relative to each other, it is necessary to fill and store the ball in the entire endless circuit, so that the ball is also placed in the no-load circuit. Must be present, and the number of balls used was wasted.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a telescopic device having a small number of parts, a simple structure, high strength, and excellent durability.

  In order to achieve the above object, the present invention proposes the following means. That is, the telescopic device according to the present invention includes a first extending member, a second extending member extending in the same direction as the first extending member, and the first extending member and the second extending member. A movable body that is disposed and relatively moves in the extending longitudinal direction, a plurality of rolling elements that are disposed between the first and second extending members, and the movable body, and the movable body A first loaded rolling element rolling surface formed by the first loaded rolling element rolling surface and a rolling element rolling surface of the first extending member, a second loaded rolling element rolling surface of the movable body, and the The rolling body direction change formed between the rolling body rolling surface of the second extending member and the first and second loading rolling body rolling paths formed at both ends of the moving body. And a road.

  Further, in the telescopic device of the present invention, the moving body is provided with two sets of the first and second load rolling element rolling paths and the rolling element direction changing path, respectively, and the rolling element direction changing on at least one side. The roads may be arranged so as to intersect each other when viewed from the longitudinal direction.

  Further, in the telescopic device of the present invention, the moving body is provided with two sets of the first and second load rolling element rolling paths and the rolling element direction changing path, respectively, and the rolling element direction changing on at least one side. The roads may be arranged so as not to cross each other when viewed from the longitudinal direction.

  Further, in the telescopic device of the present invention, the rolling element direction changing path on one side is disposed so as to intersect each other when viewed from the longitudinal direction, and the rolling element direction changing path on the other side is It is good also as arrange | positioning so that it may not mutually cross | intersect seeing from a longitudinal direction.

  In the telescopic device according to the present invention, a shaft that extends through the moving body in the longitudinal direction is disposed, and the shaft is movable relative to the moving body in the longitudinal direction. It is good as well.

  Further, in the telescopic device of the present invention, the first extending member penetrates the moving body in the longitudinal direction, and the moving body serves as the second extending member around a direction perpendicular to the longitudinal direction. It may be surrounded.

  In the telescopic device of the present invention, a plurality of infinite circulation paths including the first load rolling element rolling path, the second load rolling element rolling path, and the rolling element direction changing path are provided, and each of the infinite circulations is provided. The path may be arranged around the first extending member of the movable body with a space therebetween in the circumferential direction.

  According to the telescopic device according to the present invention, rolling of the rolling element is performed in the longitudinal direction in the first and second load rolling element rolling paths, so that there is no waste. In addition, since the rolling elements are housed in an infinite circulation path composed of the first and second load rolling element rolling paths and the rolling element direction changing path, dust or the like is difficult to adhere and noise during movement. Is also reduced. In addition, the moving body has a function of holding the rolling element and a function of moving the first and second extending members relative to each other, and the number of parts is reduced and the structure is easily formed. Moreover, the intensity | strength with respect to a moment is fully ensured and the intensity | strength of the expansion-contraction apparatus is improved. Furthermore, since the rolling elements are circulated infinitely, the dimension in the longitudinal direction can be reduced and the space can be saved.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a telescopic guide as the telescopic device of the first embodiment of the present invention, FIG. 2 is a side view of the telescopic guide of the first embodiment of the present invention viewed from the longitudinal direction, and FIG. The perspective view which shows the mobile body of the expansion-contraction guide of the 1st Embodiment of this invention, FIG. 4 is an exploded perspective view which shows the mobile body of the expansion-contraction guide of the 1st Embodiment of this invention.

  As shown in FIG. 1, the telescopic guide 10 of the present embodiment includes an extending first rail (first extending member) 1 and a second rail (second extending) extending in the same direction with respect to the first rail 1. The first rail 1 and the second rail 2 are each formed in a substantially C-shaped cross section and are arranged to face each other. A substantially rectangular parallelepiped moving body 11 is disposed between the first and second rails.

  As shown in FIG. 2, the first rail 1 has concave or grooved rolling element rolling surfaces 1 a and 1 b at both end portions orthogonal to the longitudinal direction. The rolling element rolling surface 1a is disposed at one end (left side in FIG. 2) of the both end portions, and the rolling element rolling surface 1b is disposed at the other end (right side in FIG. 2). Moreover, the 2nd rail 2 also has rolling-element rolling surfaces 2a and 2b in the both ends of the direction orthogonal to a longitudinal direction, and the rolling-element rolling surface 2a is arrange | positioned at one end among the said both ends. The rolling element rolling surface 2b is disposed at the other end.

  Further, as shown in FIGS. 1 and 3, the movable body 11 has a main body portion 12 at the center portion in the longitudinal direction, and two main body portions 12 are sandwiched from both ends in the longitudinal direction. An inner lid 13 is provided. An outer lid body 14 is provided outside the inner lid body 13, and the main body 12, the inner lid body 13, and the outer lid body 14 are integrated to form the movable body 11. ing. The two inner lid bodies 13 are made of the same member, and the two outer lid bodies 14 are also made of the same member.

  The moving body 11 is formed with two substantially loop-shaped infinite circulation paths 16 and 17 for holding a plurality of balls (rolling bodies) 15 and rolling and circulating them. These balls 15 are accommodated so as to fill the infinite circulation paths 16 and 17 respectively.

  As shown in FIG. 2, the infinite circulation path 16 includes a substantially linear first load rolling element rolling path 26 and a second load rolling element rolling path 36 extending in the longitudinal direction, and the first and second load rolling elements. It is formed from rolling element direction changing paths 46 and 56 for changing the direction of the ball 15 while smoothly connecting the rolling paths. The infinite circulation path 17 smoothly smoothes the first and second load rolling element rolling paths 37 and 27, which are substantially linear in the longitudinal direction, and the first and second load rolling element rolling paths. The rolling element direction changing paths 47 and 57 for changing the direction of the ball 15 are formed while being connected.

  The main body portion 12 of the moving body 11 has a concave or groove-shaped first load rolling element rolling surface extending in the longitudinal direction so as to be opposed to the rolling element rolling surface 1 a of the one end of the first rail 1. 12a is formed, and the first loaded rolling element rolling path 26 is formed by the rolling element rolling surface 1a and the first loaded rolling element rolling surface 12a so as to hold the ball 15 therebetween. Yes.

  Further, a concave or groove-like second load rolling element rolling surface 12b extending in the longitudinal direction is formed so as to be opposed to the rolling element rolling surface 2b at the other end of the second rail 2, These rolling element rolling surfaces 2b and second load rolling element rolling surfaces 12b form the second loaded rolling element rolling path 36 so as to hold the ball 15 therebetween.

  Similarly, a second load rolling element rolling surface 12c extending in the longitudinal direction is formed so as to face the rolling element rolling surface 2a at the one end of the second rail 2, and these rolling element rolling surfaces are formed. A second load rolling element rolling path 27 is formed by the running surface 2a and the second load rolling element rolling surface 12c so as to hold the ball 15 therebetween. In addition, a first load rolling element rolling surface 12d extending in the longitudinal direction is formed so as to face the rolling element rolling path 1b at the other end of the first rail 1, and these rolling element rolling surfaces 1b are formed. And the first load rolling element rolling surface 12d, the first load rolling element rolling path 37 is formed so as to hold the ball 15 therebetween.

  The first rail 1 and the moving body 11 are engaged with each other by holding the balls 15 in the first load rolling element rolling paths 26 and 37 in this way, and can be relatively moved only in the longitudinal direction. It is immovable in other directions. Further, the second rail 2 and the moving body 11 are engaged with each other by holding the ball 15 on the second load rolling element rolling paths 27 and 36, and can be relatively moved only in the longitudinal direction. It is immovable in the direction of.

  Moreover, as shown in FIG. 4, the rolling element direction change path 56 provided in one side (left side in FIG. 4) of the longitudinal direction among the two rolling element direction change paths 46 and 56 of the infinite circulation path 16 moves. Formed by the groove-shaped direction changing guide portion 23 of the inner lid body 13b provided on one side of the two inner lid bodies 13 of the body 11 and the outer surface of the main body portion 12 adjacent to the inner side of the inner lid body 13b. Has been. Further, the rolling element direction changing path 46 includes a groove-shaped direction changing guide portion 24 of the outer lid body 14a on the other side (right side in FIG. 4) and an inner lid body 13a adjacent to the inner side of the outer lid body 14a. And an outer surface.

  Of the two rolling element direction changing paths 47 and 57 of the infinite circulation path 17, the rolling element direction changing path 57 provided on one side in the longitudinal direction is a groove-shaped direction of the outer lid body 14b provided on one side. It is formed by the conversion guide part 24 and the outer surface of the inner lid body 13b adjacent to the inner side of the outer lid body 14b. Further, the rolling element direction changing path 47 is formed by the groove-shaped direction changing guide portion 23 of the inner lid body 13a on the other side and the outer surface of the main body portion 12 adjacent to the inner side of the inner lid body 13a. .

  Here, the rolling element direction changing path 56 of the endless circulation path 16 and the rolling element direction changing path 57 of the endless circulation path 17 are adjacent to each other in the longitudinal direction and are viewed from the side as viewed from the longitudinal direction. They are arranged so that they intersect. Further, the rolling element direction changing path 46 of the endless circulation path 16 and the rolling element direction changing path 47 of the endless circulation path 17 are adjacent to each other in the longitudinal direction and intersect each other in a side view as viewed from the longitudinal direction. It is arranged like that.

Next, the operation of the telescopic guide 10 configured as described above will be described.
First, in FIG. 1, when the first rail 1 and the second rail 2 are moved away from each other in the longitudinal direction and the telescopic guide 10 is extended, the first rail 1 is moved relative to the moving body 11. As the ball 15 is relatively moved to the other side (the right side in FIG. 1), the ball 15 held by the first load rolling element rolling path 26 moves in the first load rolling element rolling path 26 to the other side. Rolled over.

  Further, as the second rail 2 is moved relative to the moving body 11 to one side (left side in FIG. 1), the ball 15 held by the second load rolling element rolling path 36 is moved to the second load. It is rolled to the said one side in the rolling-element rolling path 36. FIG.

  Then, as the balls 15 held in the first and second load rolling element rolling paths roll in the opposite directions, the balls 15 in the rolling element direction changing path 46 become the first load rolling element rolling path. 26 is circulated so that the direction is changed from the other end of 26 toward the other end of the second load rolling element rolling path 36. Further, the ball 15 in the rolling element direction change path 56 changes direction from one end of the second load rolling element rolling path 36 toward one end of the first load rolling element rolling path 26. It is circulated as it is.

  That is, the entire ball 15 held in the endless circulation path 16 is circulated in this way, and the ball 15 held in the endless circulation path 17 is also the same. It is designed to be circulated. As the balls 15 in the infinite circulation paths 16 and 17 roll and circulate, the telescopic guide 10 smoothly moves and relatively moves the first rail 1 and the second rail 2 in the longitudinal direction. It is like that.

  Further, the first rail 1 and the second rail 2 are close to each other so as to overlap each other in the longitudinal direction, and when the telescopic guide 10 is contracted, the balls 15 in the paths of the infinite circulation paths 16 and 17 are disposed. The direction of the circulation is opposite to that in the above-described extension. The telescopic guide 10 is contracted by smoothly moving the first rail 1 and the second rail 2 relative to each other in the longitudinal direction.

  As described above, according to the telescopic guide 10 of the present embodiment, the infinite circulation path 16 includes the first load rolling element rolling path 26 and the second load rolling element rolling path 36 that are arranged extending in the longitudinal direction. The rolling element direction change paths 46 and 56 are provided so as to connect these. The infinite circulation path 17 has a first load rolling element rolling path 37 and a second load rolling element rolling path 27 arranged extending in the longitudinal direction, and the rolling elements are connected so as to connect them. Direction change paths 47 and 57 are provided.

  The endless circulation paths 16 and 17 are not provided with a no-load circulation path as a return path for the ball 15 as in the prior art. Each of the first and second load rolling element rolling paths is used for the relative movement by rolling the ball.

  Accordingly, since the portion where the ball 15 is not used for rolling for the relative movement is only in the rolling element direction changing paths 46, 56, 47, 57, an infinite circulation path as in the prior art. There is no need to hold and store extra balls in the no-load circulation path just for filling the road, and these balls 15 are used effectively and there is no waste.

  The moving body 11 has a function of holding a plurality of balls 15 and a function of moving the first and second rails relative to each other, and the holding balls 15 are moved in the paths of the infinite circulation paths 16 and 17. Since infinite circulation is possible, it is not necessary to provide a cage and an intermediate rail as separate bodies, for example, as in the prior art, the number of parts is reduced, and the structure is easily formed. Further, since the moving body 11 is formed in a substantially rectangular parallelepiped shape, the strength against a moment such as twisting is sufficiently secured, and the strength of the telescopic guide 10 is improved.

In addition, since the balls 15 are accommodated in the infinite circulation paths 16 and 17, external dust or the like is hardly attached, and noise during movement is reduced.
Further, when the moving body 11 circulates the balls 15 infinitely in the infinite circulation paths 16 and 17, the intermediate rail is used, for example, as in the prior art, and the intermediate rail has substantially the same dimension as the stroke length of the telescopic guide. Therefore, the dimension of the moving body 11 in the longitudinal direction can be reduced, and the space can be saved.

  The telescopic guide 10 is provided with two first load rolling element rolling paths that engage with the first rail 1 and two second load rolling element rolling paths that engage with the second rail 2. Since the ball 15 rolls on each of the first and second load rolling element rolling paths, and the movable body 11 moves relative to the first rail 1 and the second rail 2, the movable body 11 and each rail The engagement is more stable and has high strength, and more reliable and highly accurate expansion and contraction is performed.

  Further, the rolling element direction changing paths 46 and 47 and the rolling element direction changing paths 56 and 57 are arranged so as to cross each other in a side view as viewed from the longitudinal direction. The rolling element direction change path configured in this way can be formed with a relatively large radius of curvature in a limited space, so that the circulation of the balls 15 held in the path can be performed more smoothly. it can. Therefore, noise during operation of the ball 15 is further reduced and circulation is performed with higher accuracy.

Next, a second embodiment of the present invention will be described.
FIG. 5 is a perspective view showing a telescopic guide as the telescopic device of the second embodiment of the present invention, FIG. 6 is a schematic side view of the telescopic guide of the second embodiment of the present invention viewed from the longitudinal direction, and FIG. It is explanatory drawing which shows arrangement | positioning of the cover body and rolling element of the expansion-contraction guide of 2nd Embodiment.
In addition, the same code | symbol is attached | subjected to the same member as the expansion-contraction guide 10 of above-mentioned 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 5 and 6, the telescopic guide 20 of the present embodiment has a substantially rectangular parallelepiped shape between the extending first rail 1 and the second rail 2 extending in the same direction with respect to the first rail 1. The moving body 21 is provided.

  As shown in FIG. 5, the moving body 21 has a main body portion 22 at the center portion in the longitudinal direction, and two lid bodies 25 are arranged so as to sandwich the main body portion 22 from both ends in the longitudinal direction. It is installed. And these main-body parts 22 and the cover body 25 are united, and the moving body 21 is formed. The two lids 25 are made of the same member.

  The moving body 21 is formed with two substantially loop-shaped infinite circulation paths 60 and 70 for holding a plurality of balls 15 and rolling and circulating them. These balls 15 are stored so as to fill the infinite circulation paths 60 and 70 respectively.

  As shown in FIG. 6, the infinite circuit 60 includes a substantially straight first load rolling element rolling path 61 and a second load rolling element rolling path 62 extending in the longitudinal direction, and the first and second load rolling elements. It is formed from two rolling element direction changing paths 63 that are formed so as to smoothly connect the rolling paths and change the direction of the ball 15. The infinite circulation path 70 smoothly smoothes the first load rolling element rolling path 71 and the second load rolling element rolling path 72 that are substantially linear extending in the longitudinal direction, and the first and second load rolling element rolling paths. It is formed by connecting two rolling element direction change paths 73 for changing the direction of the ball 15.

  The main body 22 of the moving body 21 has a concave or groove-shaped first load rolling element rolling surface extending in the longitudinal direction so as to be opposed to the rolling element rolling surface 1 a of the one end of the first rail 1. 22a is formed, and the first load rolling element rolling path 61 is formed by the rolling element rolling surface 1a and the first load rolling element rolling surface 22a so as to hold the ball 15 therebetween. Yes.

  In addition, a concave or groove-like second load rolling element rolling surface 22b extending in the longitudinal direction is formed so as to be opposed to the rolling element rolling surface 2a of the one end of the second rail 2, and these The second load rolling element rolling path 62 is formed by the rolling element rolling surface 2a and the second load rolling element rolling surface 22b so as to hold the ball 15 therebetween.

  Similarly, a first load rolling element rolling surface 22c extending in the longitudinal direction is formed so as to face the rolling element rolling surface 1b at the other end of the first rail 1, and these rolling elements are formed. A first load rolling element rolling path 71 is formed by the rolling surface 1b and the first load rolling element rolling surface 22c so as to hold the ball 15 therebetween. Moreover, the 2nd load rolling-element rolling surface 22d extended in a longitudinal direction is formed so that it may oppose to the rolling-element rolling path 2b of the said other end of the 2nd rail 2, and these rolling-element rolling surfaces 2b are formed. And the second load rolling element rolling surface 22d, the second load rolling element rolling path 72 is formed so as to hold the ball 15 therebetween.

  The first rail 1 and the moving body 21 are engaged with each other by holding the balls 15 in the first load rolling element rolling paths 61 and 71 in this way, and can be relatively moved only in the longitudinal direction. It is immovable in other directions. Further, the second rail 2 and the moving body 21 are engaged with each other by holding the ball 15 in the second load rolling element rolling paths 62 and 72, and can be relatively moved only in the longitudinal direction. It is immovable in the direction of.

  Further, as shown in FIG. 7, the rolling element direction changing paths 63 and 73 provided at both end portions of the endless circulation paths 60 and 70 are groove-shaped direction changing guide portions of the lid body 25 of the moving body 21. 25a and the outer surface of the main body 22 on the inner side of the lid 25.

  The rolling element direction changing path 63 of the endless circulation path 60 and the rolling element direction changing path 73 of the endless circulation path 70 formed in this way are arranged so as not to cross each other when viewed from the longitudinal direction. Further, as shown in FIGS. 5 and 6, a through-hole 28 that penetrates the moving body 21 in the longitudinal direction is provided between the infinite circulation path 60 and the infinite circulation path 70. Is provided with a substantially rod-shaped shaft body (not shown) that extends through the through-hole 28 in the longitudinal direction, and the movable body 21 and the shaft body are configured to be relatively movable in the longitudinal direction. A mechanism (not shown) is formed.

Next, operation | movement of the expansion-contraction guide 20 comprised in this way is demonstrated.
First, when the first rail 1 and the second rail 2 are moved so as to be separated from each other in the longitudinal direction, and the telescopic guide 20 is extended, the first rail 1 is moved, for example, to the other side with respect to the moving body 21. With the relative movement, the ball 15 held on the first load rolling element rolling path 61 rolls in the first load rolling element rolling path 61 to the other side.

  Further, as the second rail 2 is relatively moved to one side with respect to the moving body 21, the ball 15 held by the second load rolling element rolling path 62 is moved into the second load rolling element rolling path 62. Is rolled to the one side.

  As the balls 15 held in the first and second load rolling element rolling paths roll in the opposite direction, the balls 15 in the rolling element direction changing path 63 on the other side in the longitudinal direction are Circulation is performed such that the direction is changed from the other end of the first load rolling element rolling path 61 toward the other end of the second load rolling element rolling path 62. The ball 15 in the rolling element direction changing path 63 on one side is directed from one end of the second load rolling element rolling path 62 to an end on one side of the first loaded rolling element rolling path 61. It is circulated as if it is changed direction.

  In other words, the entire ball 15 held in the endless circulation path 60 is circulated in this way, and the ball 15 held in the endless circulation path 70 is also the same. It is designed to be circulated. As the balls 15 in the infinite circulation paths 60 and 70 roll and circulate, the telescopic guide 20 smoothly moves the first rail 1 and the second rail 2 relative to each other in the longitudinal direction and extends. It is supposed to be.

  When the first rail 1 and the second rail 2 are close to each other so as to overlap each other in the longitudinal direction and the telescopic guide 20 is contracted, the balls 15 in the infinite circulation paths 60 and 70 are circulated. The direction to perform is opposite to that in the above-described extension. The telescopic guide 20 is configured to contract relative to each other by smoothly moving the first rail 1 and the second rail 2 in the longitudinal direction.

As described above, according to the telescopic guide 20 of the present embodiment, the following effects can be achieved while having the effects described in the telescopic guide 10 of the first embodiment.
That is, both end portions of the endless circulation paths 60 and 70 in the longitudinal direction are integrally formed with the lid bodies 25 respectively disposed at both ends of the main body portion 22 in the longitudinal direction, and each of the endless circulation paths 60 and 70 is formed. It is not necessary to form the rolling element direction change paths 63 and 73 in separate lids. Therefore, the number of parts is reduced, the cost is reduced, and the assembly workability is improved.

In addition, since the infinite circulation paths 60 and 70 are each formed with a relatively short circumference, the number of balls 15 held in the path is reduced, and the material cost is reduced.
Moreover, since the ball screw mechanism provided with a shaft body can be provided using the through-hole 28 of the moving body 21, the expansion-contraction guide 20 which can respond to various various requests and uses can be provided.

Next, a third embodiment of the present invention will be described.
FIG. 8 is a perspective view showing an extension guide as an extension device of the third embodiment of the present invention, and FIG. 9 is an explanatory view showing the arrangement of the lid and rolling elements of the extension guide of the third embodiment.
In addition, the same code | symbol is attached | subjected to the same member as the expansion-contraction guides 10 and 20 of above-mentioned 1st, 2nd embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 8, the telescopic guide 30 of the present embodiment has a substantially rectangular parallelepiped moving body between the extending first rail 1 and the second rail 2 extending in the same direction with respect to the first rail 1. 31 is provided.

  The movable body 31 has a main body portion 12 in the central portion in the longitudinal direction. A lid body 25 is disposed on one side (left side in FIG. 8) of the main body portion 12 in the longitudinal direction, and the other side (see FIG. 8 on the right side), an inner lid body 13 is disposed, and an outer lid body 14 is provided outside the inner lid body 13. The main body 12, the lid body 25, the inner lid body 13, and the outer lid body 14 are integrated to form a moving body 31.

  The moving body 31 is formed with an infinite circulation path 80 composed of a single line for holding a plurality of balls 15 and rolling and circulating. These balls 15 are stored so as to fill the inside of the infinite circulation path 80.

  As shown in FIG. 9, the infinite circulation path 80 includes two substantially linear first load rolling element rolling paths 26 and 37 and two second load rolling element rolling paths 27 and 36 extending in the longitudinal direction, It is formed of four rolling element direction change paths 46, 47, 63, 73 that change the direction of the ball 15 so as to smoothly connect the first and second load rolling element rolling paths.

Next, the operation of the telescopic guide 30 configured as described above will be described.
First, when the first rail 1 and the second rail 2 are moved so as to be separated from each other in the longitudinal direction, and the telescopic guide 30 is extended, the first rail 1 is moved to the other side with respect to the moving body 31, for example. With the relative movement, the ball 15 held by the first load rolling element rolling path 26 is rolled to the other side in the path of the first load rolling element rolling path 26.

  Further, as the second rail 2 is relatively moved to one side with respect to the moving body 31, the ball 15 held by the second load rolling element rolling path 36 is moved to the second load rolling element rolling path 36. Roll along the road to the one side.

  As the balls 15 held in the first and second load rolling element rolling paths roll in the opposite direction, the balls 15 in the rolling element direction changing path 46 on the other side in the longitudinal direction are Circulation is performed such that the direction is changed from the other end of the first load rolling element rolling path 26 toward the other end of the second load rolling element rolling path 36.

  Further, the ball 15 in the first load rolling element rolling path 37 is rolled from one side to the other side, and the second load rolling element rolling path 36 and the first load rolling element rolling path 37 are connected to each other. With the rolling of the balls 15 held in the opposite directions, the balls 15 in the rolling element direction changing path 73 are moved from the one end of the second load rolling element rolling path 36 to the first load rolling. The moving body rolling path 37 is circulated so as to be turned toward one end of the moving body rolling path 37.

  Moreover, since the ball 15 in the second load rolling element rolling path 27 is rolled from the other side toward the one side, the first load rolling element rolling path 37 and the second load rolling element rolling path 27 are moved. The balls 15 in the rolling element direction changing path 47 are moved from the other end of the first load rolling element rolling path 37 to the second load rolling with the rolling of the balls 15 held in the opposite directions. Circulation is performed in such a manner that the direction is changed toward the other end of the moving body rolling path 27.

  Furthermore, since the ball 15 in the path of the first load rolling element rolling path 26 is rolled from one side to the other side, the second load rolling element rolling path 27 and the first load rolling element rolling path 26. The balls 15 in the rolling element direction changing path 63 are moved from the end on one side of the second load rolling element rolling path 27 to the first load rolling with the rolling of the balls 15 held in the opposite directions. Circulation is performed in such a manner that the direction is changed toward one end of the moving body rolling path 26.

  That is, the entire ball 15 held in the endless circulation path 80 is circulated in this way, and the circulated ball 15 is circulated by the two first load rolling element rolling paths 26, 37 and 2. By rolling on the two second load rolling element rolling paths 27 and 36, the telescopic guide 30 is configured to smoothly move the first rail 1 and the second rail 2 relative to each other in the longitudinal direction and extend. .

  When the first rail 1 and the second rail 2 are close to each other so as to overlap each other in the longitudinal direction and the telescopic guide 30 is contracted, the direction in which the balls 15 circulate in the infinite circulation path 80 is changed. In the opposite direction to the above-described extension. The telescopic guide 30 is configured to contract smoothly by relatively moving the first rail 1 and the second rail 2 in the longitudinal direction.

As described above, according to the telescopic guide 30 of the present embodiment, the following effects can be achieved while having the effects described in the telescopic guides 10 and 20 of the first and second embodiments described above.
That is, the infinite circulation path 80 includes all of the two first load rolling element rolling paths 26 and 37, the two second load rolling element rolling paths 27 and 36, and the four rolling element direction changing paths 46, 47, 63, and 73. They are connected in a continuous manner and are formed in one strip. According to such a configuration, for example, compared to a configuration in which a plurality of sets of infinite circulation paths are provided, the rolling and circulation of the balls 15 accommodated therein are uniformly performed as a whole, so that a highly accurate relative movement can be expected.

Next, a fourth embodiment of the present invention will be described.
FIG. 10 is a partially transparent perspective view showing an expansion / contraction spline as an expansion / contraction device according to a fourth embodiment of the present invention, FIG. 11 is an exploded perspective view showing a schematic configuration of a movable body of the expansion / contraction spline of the fourth embodiment, and FIG. [FIG. 12] It is a sectional side view which shows the AA arrow of FIG.

  As shown in FIGS. 10 to 12, the expansion / contraction spline 40 of the present embodiment includes a substantially round bar-shaped track body (first extending member) 41 and a track body 41 extending in the longitudinal direction. In addition, the track body 41 and a substantially cylindrical tubular body (second extending member) 42 whose outer length in the longitudinal direction is set to be substantially the same are provided. A substantially cylindrical moving body 51 is disposed between the track body 41 and the cylinder 42 so as to be accommodated in the cylinder of the cylinder 42. That is, the rod-shaped track body 41 is inserted into the cylindrical moving body 51, and the moving body 51 is inserted into the cylindrical cylinder 42.

On the outer peripheral surface of the track body 41, a plurality of rolling-element rolling surfaces 41a having a groove shape extending in the longitudinal direction are formed. In addition, a plurality of concave rolling member rolling surfaces 42 a extending in the longitudinal direction are formed on the inner peripheral surface of the cylindrical body 42.
Further, as shown in FIG. 11, the moving body 51 has a substantially cylindrical main body 52 at the center in the longitudinal direction, and the main body 52 is sandwiched from both ends in the longitudinal direction so as to be substantially Two annular lid bodies 53 are arranged to face each other. These lid bodies 53 are formed symmetrically with each other.

  On the inner peripheral surface of the main body 52 of the moving body 51, a plurality of first grooved rolling surface rolling surfaces 52a extending in the longitudinal direction are formed. These first load rolling element rolling surfaces 52 a are respectively arranged to face the rolling element rolling surfaces 41 a of the track body 41 to form respective first load rolling element rolling paths 81. The plurality of first load rolling element rolling surfaces 52 a are arranged on the inner peripheral surface of the moving body 51 at equal intervals in the circumferential direction.

A plurality of second load rolling element rolling surfaces 52b having a groove shape extending along the longitudinal direction are formed on the outer peripheral surface of the main body 52 of the moving body 51. These second load rolling element rolling surfaces 52b are respectively disposed opposite to the rolling element rolling surfaces 42a of the cylindrical body 42 to form respective second load rolling element rolling paths 82. The plurality of second load rolling element rolling surfaces 52 b are arranged on the outer peripheral surface of the moving body 51 at equal intervals in the circumferential direction.
Further, the first loaded rolling element rolling surface 52a and the second loaded rolling element rolling surface 52b are formed at different positions in the circumferential direction of the moving body 51, for example, 45 ° around the central axis of the track body 41. It arrange | positions so that it may shift | deviate to some extent.

Moreover, it protrudes from the both end surfaces of the longitudinal direction of the main-body part 52 so that the 1st load rolling element rolling surface 52a and the 2nd load rolling element rolling surface 52b may be connected smoothly, and a some rolling element direction change inner periphery guide A portion 52c is formed. Further, the surface of each lid 53 facing the main body 52 is disposed to face the rolling element direction changing inner circumferential guide portion 52c, and a gap is formed between the rolling body direction changing inner circumferential guide portion 52c. A plurality of rolling element direction change outer periphery guide portions 53a formed in a substantially concave groove shape so as to be opened are provided.
A plurality of rolling element direction change paths 83 are formed so as to be sandwiched between the rolling element direction changing inner periphery guide part 52c and the rolling element direction changing outer periphery guide part 53a.

A plurality of infinite circulation paths 90 in the form of a long loop composed of the first load rolling element rolling path 81, the second load rolling element rolling path 82, and the rolling element rolling path 83 are formed. That is, the first load rolling element rolling path 81 and the second load rolling element rolling path 82 that are arranged substantially parallel to each other along the longitudinal direction, and the two rolling element rolling paths 83 on one side and the other side in the longitudinal direction. The infinite circulation path 90 is formed so as to connect smoothly.
The moving body 51 holds and holds a plurality of balls (rolling bodies) 55 so that the inside of the infinite circulation path 90 is filled, and each ball 55 circulates in the path and rolls. It is possible to run.

  The track body 41 and the moving body 51 are restrained from relative movement in the circumferential direction by holding the ball 55 in the first load rolling element rolling path 81, and in the longitudinal direction by the rolling of the ball 55. Relative movement is possible. In addition, the cylindrical body 42 and the moving body 51 are restrained from relative movement in the circumferential direction by holding the ball 55 in the second load rolling element rolling path 82, and are elongated by the rolling of the ball 55. Relative movement is possible in the direction.

Next, the operation of the telescopic spline 40 configured as described above will be described.
When the telescopic spline 40 that is in a contracted state is extended as shown in FIG. 10, the track body 41 and the cylindrical body 42 move in a direction away from each other in the longitudinal direction. At this time, as the track body 41 moves relative to the moving body 51 to the other side (the right side in FIG. 10), the balls 55 arranged on the first load rolling element rolling path 81 are moved to the first load rolling path. Roll in the moving body rolling path 81 to the other side.

  Further, as the cylindrical body 42 moves relative to the moving body 51 to one side (left side in FIG. 10), the balls 55 arranged in the second load rolling element rolling path 82 are moved to the second load rolling element. Roll to one side of the rolling path 82.

  Further, as the respective balls 55 arranged in the first and second load rolling element rolling paths 81 and 82 roll in the opposite longitudinal direction, they are arranged in the other rolling element direction changing path 83. The ball 55 rolls so that the direction is changed from the other end portion of the first load rolling element rolling path 81 toward the other end portion of the second load rolling element rolling path 82. Further, the ball 55 arranged in the rolling element direction changing path 83 on one side is directed from the one end part of the second load rolling element rolling path 82 to the one end part of the first loaded rolling element rolling path 81. Roll to change direction.

  That is, due to the relative movement in the longitudinal direction of the track body 41, the moving body 51, and the cylindrical body 42, the plurality of balls 55 held in the respective infinite circulation paths 90 circulate throughout the loop-shaped path. As these balls 55 circulate, the expansion / contraction spline 40 is extended by smoothly moving the track body 41 and the cylindrical body 42 relative to each other in the longitudinal direction.

  In addition, when the telescopic spline 40 in the extended state contracts and the track body 41 and the cylinder body 42 come close to each other so as to overlap each other in the longitudinal direction, the respective balls in the infinite circulation path 90 55 rolls and circulates in a direction opposite to the rolling direction of the ball 55 at the time of extension described above. As the balls 55 circulate, the telescopic spline 40 contracts by smoothly moving the track body 41 and the cylinder body 42 in the longitudinal direction.

As described above, according to the expansion / contraction spline 40 of the present embodiment, the same effects as those described in the expansion / contraction guides 10, 20, and 30 of the first to third embodiments are provided.
Further, the rod-like track body 41 is surrounded by the cylindrical moving body 51, the moving body 51 is surrounded by the cylindrical tube body 42, and the track body 41, the moving body 51, and the cylinder body 42 are relatively moved in the longitudinal direction. Since the expansion / contraction motion is performed, by incorporating the expansion / contraction spline 40 into a device or the like, it is possible to meet various demands and applications for the motion. In addition, since the moving body 51 is formed in a cylindrical shape, the strength against a moment such as a twist applied to the apparatus is sufficiently secured, and the strength of the telescopic spline 40 is improved.

  Since a loop-shaped infinite circuit 90 composed of the first load rolling element rolling path 81, the second load rolling element rolling path 82 and the two rolling element direction changing paths 83 connecting them is formed, There is no provision of a no-load circuit used for returning the balls 55 used for the rolling of the movement back to the loaded rolling element rolling path. Therefore, the rolling of the ball 55 is effectively performed without waste by the circulation and return in the longitudinal direction.

In addition, a plurality of infinite circulation paths 90 including a first load rolling element rolling path 81, a second load rolling element rolling path 82, and a rolling element direction changing path 83 are provided. Since the track bodies 41 are arranged at equal intervals in the circumferential direction, the mechanical strength against the external force applied to the device from the outer periphery of the expansion / contraction spline 40 is increased, and the accuracy of the expansion / contraction motion is sufficiently ensured. In addition, the arrangement | positioning space | interval of the circumferential direction of each infinite circulation path 90 is not limited equally to the circumferential direction of this embodiment, For example, it is good also as arrange | positioning at intervals in the circumferential direction unevenly. .
Further, since the cylindrical body 42 is formed in a substantially cylindrical shape, the radial outer shape orthogonal to the longitudinal direction of the apparatus can be set small, and space saving is possible.

Next, a fifth embodiment of the present invention will be described.
13 is a partially transparent perspective view showing a telescopic spline as a telescopic device according to a fifth embodiment of the present invention, FIG. 14 is an exploded perspective view showing a schematic configuration of a movable body of the telescopic spline of the fifth embodiment, and FIG. [FIG. 15] It is a sectional side view which shows the BB arrow of FIG.
In addition, the same code | symbol is attached | subjected to the same member as the expansion-contraction spline 40 of the above-mentioned 4th Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 13 to 15, the telescopic spline 50 of the present embodiment extends through the track body 41 and extends in the longitudinal direction, and the outer length of the track body 41 is set to be substantially the same. A cylindrical body (second extending member) 92 having a substantially rectangular tube shape is provided. Further, between the track body 41 and the cylindrical body 92, a substantially rectangular cylindrical moving body 101 is disposed so as to be accommodated in the cylinder of the cylindrical body 92. That is, the rod-shaped track body 41 is inserted into the cylindrical moving body 101, and the moving body 101 is inserted into the cylindrical cylinder 92.

The four corners of the inner periphery of the cylindrical body 92 are each formed into a concave groove shape extending in the longitudinal direction, and serve as a rolling element rolling surface 92a.
Further, as shown in FIG. 14, the moving body 101 has a substantially rectangular tube-shaped main body portion 102 in the center portion in the longitudinal direction, and the center of the cross section perpendicular to the longitudinal direction of the main body portion 102 is a track body. It is formed in a substantially cylindrical hole shape through which 41 can penetrate. Further, two substantially square plate-like lids 103 are arranged so as to sandwich the main body 102 from both ends in the longitudinal direction, and the track body 41 can penetrate the center of the cross section of the lids 103. It is formed in a substantially circular hole shape. These lids 103 are formed symmetrically with each other.

  On the inner peripheral surface of the main body 102 of the moving body 101, a plurality of first load rolling element rolling surfaces 102a having a groove shape extending in the longitudinal direction are formed. These first load rolling element rolling surfaces 102 a are respectively arranged to face the rolling element rolling surfaces 41 a of the track body 41 to form respective first load rolling element rolling paths 111. The plurality of first load rolling element rolling surfaces 102 a are arranged on the inner peripheral surface of the moving body 101 at equal intervals in the circumferential direction.

In addition, a plurality of concave groove-shaped second load rolling element rolling surfaces 102 b extending along the longitudinal direction are formed at the four corners of the outer periphery of the main body 102 of the moving body 101. These second load rolling element rolling surfaces 102b are respectively arranged to face the rolling element rolling surfaces 92a of the cylindrical body 92 to form respective second load rolling element rolling paths 112.
In addition, the first loaded rolling element rolling surface 102a and the second loaded rolling element rolling surface 102b are formed at different positions in the circumferential direction of the moving body 101, for example, 45 ° around the central axis of the track body 41. It arrange | positions so that it may shift | deviate to some extent.

Also, a plurality of rolling element direction change inner peripheral guides projecting from both longitudinal end surfaces of the main body 102 so as to smoothly connect the first loaded rolling element rolling surface 102a and the second loaded rolling element rolling surface 102b. A portion 102c is formed. Further, on the surface of each lid 103 facing the main body 102, it is disposed opposite to the rolling element direction changing inner circumferential guide part 102c, and a gap is formed between the rolling body direction changing inner circumferential guide part 102c. A plurality of rolling element direction change outer periphery guide portions 103a formed in a substantially concave groove shape so as to be opened are provided.
A plurality of rolling element direction changing paths 113 are formed so as to be sandwiched between the rolling element direction changing inner periphery guide part 102c and the rolling element direction changing outer periphery guide part 103a.

  In addition, a plurality of infinite circulation paths 120 in the form of a long circle formed by the first load rolling element rolling path 111, the second load rolling element rolling path 112, and the rolling element rolling path 113 are formed. That is, the first load rolling element rolling path 111 and the second load rolling element rolling path 112 that are arranged substantially parallel to each other along the longitudinal direction, and the two rolling element rolling paths 113 are one side and the other side in the longitudinal direction. The infinite circulation path 120 is formed so as to connect smoothly.

  The track body 41 and the moving body 101 are restrained from relative movement in the circumferential direction by holding the ball 55 on the first load rolling element rolling path 111, and in the longitudinal direction by the rolling of the ball 55. Relative movement is possible. Further, the cylindrical body 92 and the moving body 101 are engaged so that the ball 55 is held in the second load rolling element rolling path 112 and the inner periphery of the cylindrical body 92 and the outer periphery of the moving body 101 are fitted together. Therefore, relative movement in the circumferential direction is restricted, and relative movement in the longitudinal direction is enabled by rolling of the ball 55 of the second load rolling element rolling path 112.

As described above, according to the expansion / contraction spline 50 of this embodiment, it has the same effect as the effect demonstrated in the expansion / contraction spline 40 of the above-mentioned 4th Embodiment.
Moreover, since the cylindrical body 92 is formed in a rectangular tube shape and the rolling element rolling surface 92a of the cylindrical body 92 can be formed using the corners of the four corners of the inner periphery, the rolling element rolling surface 92a is formed. Therefore, it is possible to reduce the number of processes for cutting and the like, to reduce the number of manufacturing processes and to improve productivity.

The present invention is not limited to the first to fifth embodiments described above, and various modifications can be made without departing from the spirit of the present invention.
For example, in the first and second embodiments, it has been described that two infinite circulation paths are provided. However, the present invention is not limited to this, and the apparatus may be configured with one or three infinite circulation paths. Four or more may be used. In the fourth and fifth embodiments, a plurality of infinite circulation paths are provided. However, one infinite circulation path may be provided. However, when there is one infinite circulation path, a sliding guide mechanism is further used between the moving body and each rail so that the moving body and each rail, track body or cylinder are stabilized and securely engaged. It is preferable to combine them.

  In the third embodiment, one endless circulation path 80 is provided. However, the present invention is not limited to this. For example, two or more endless circulation paths 80 are adjacent to each other in the longitudinal direction of the moving body 31. You may comprise an apparatus side by side.

In the fourth and fifth embodiments, the track body 41 is described as being formed in a substantially round bar shape. However, the present invention is not limited to this, and for example, a cross section orthogonal to the longitudinal direction thereof has a substantially elliptical shape, a substantially triangular shape, It is good also as forming in rod shape other than that, such as a substantially square shape or a substantially hexagonal shape. Further, the track body 41 may be formed in other shapes such as a cylindrical shape or a plate shape without being formed into a rod shape.
In the fourth and fifth embodiments, the movable bodies 51 and 101 and the cylindrical bodies 42 and 92 are described as being formed in a substantially cylindrical shape or a substantially rectangular tube shape, respectively, but are limited to these shapes. It may be other shapes such as a substantially elliptical cylinder, a substantially triangular cylinder, or a substantially hexagonal cylinder. Further, the movable bodies 51 and 101 and the cylinders 42 and 92 may be formed in other shapes, for example, by cutting out a part in the circumferential direction and forming a substantially C-shaped cross section without forming the cylinders 42 and 92 in a cylindrical shape. .

  In the first to fifth embodiments, the balls 15 and 55 are described as rolling elements. However, the present invention is not limited to this. For example, instead of the balls 15 and 55, an apparatus using a substantially cylindrical roller is used. You may comprise.

It is a perspective view which shows the expansion-contraction guide as an expansion-contraction apparatus of the 1st Embodiment of this invention. It is the side view which looked at the expansion-contraction guide as an expansion-contraction apparatus of the 1st Embodiment of this invention from the longitudinal direction. It is a perspective view which shows the moving body of the expansion-contraction guide as an expansion-contraction apparatus of the 1st Embodiment of this invention. It is a disassembled perspective view which shows the moving body of the expansion-contraction guide as an expansion-contraction apparatus of the 1st Embodiment of this invention. It is a perspective view which shows the expansion-contraction guide as an expansion-contraction apparatus of the 2nd Embodiment of this invention. It is the schematic side view which looked at the expansion-contraction guide as an expansion-contraction apparatus of the 2nd Embodiment of this invention from the longitudinal direction. It is explanatory drawing which shows arrangement | positioning of the cover body and rolling body of an expansion-contraction guide as an expansion-contraction apparatus of the 2nd Embodiment of this invention. It is a perspective view which shows the expansion-contraction guide as an expansion-contraction apparatus of the 3rd Embodiment of this invention. It is explanatory drawing which shows arrangement | positioning of the cover body and rolling body of an expansion-contraction guide as an expansion-contraction apparatus of the 3rd Embodiment of this invention. It is a partially transparent perspective view which shows the expansion-contraction spline as an expansion-contraction apparatus of the 4th Embodiment of this invention. It is a disassembled perspective view which shows schematic structure of the moving body of the expansion-contraction spline as an expansion-contraction apparatus of the 4th Embodiment of this invention. It is a sectional side view which shows the AA arrow of FIG. It is a partially transparent perspective view which shows the expansion-contraction spline as an expansion-contraction apparatus of the 5th Embodiment of this invention. It is a disassembled perspective view which shows schematic structure of the moving body of the expansion-contraction spline as an expansion-contraction apparatus of the 5th Embodiment of this invention. It is a sectional side view which shows the BB arrow of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st rail (1st extending member), 1a, 1b, 2a, 2b, 41a, 42a, 92a ... Rolling-element rolling surface, 2 ... 2nd rail (2nd extending member), 10, 20, 30 ... telescopic guide (extension device), 11, 21, 31, 51, 101 ... moving body, 12a, 12d, 22a, 22c, 52a, 102a ... first load rolling element rolling surface, 12b, 12c, 22b, 22d , 52b, 102b ... second load rolling element rolling surface, 15, 55 ... ball (rolling element), 26, 37, 61, 71, 81, 111 ... first load rolling element rolling path, 27, 36, 62, 72, 82, 112 ... second load rolling element rolling path, 40, 50 ... telescopic spline (extensible device), 41 ... raceway (first extending member), 42, 92 ... cylindrical body (second extending member) 46, 47, 56, 57, 63, 73, 83, 13 ... rolling element direction changing passage.

Claims (7)

A first extending member;
A second extending member extending in the same direction as the first extending member;
A movable body disposed between the first extending member and the second extending member and relatively moving in the extending longitudinal direction;
A plurality of rolling elements disposed between the first extending member and the second extending member and the moving body;
A first load rolling element rolling path formed by the first load rolling element rolling surface of the moving body and the rolling element rolling surface of the first extending member;
A second load rolling element rolling path formed by the second load rolling element rolling surface of the movable body and the rolling element rolling surface of the second extending member;
A telescopic device comprising: a rolling element direction changing path formed at both ends of the moving body and connecting the first and second load rolling element rolling paths. The telescopic device according to claim 1,
The moving body is provided with two sets of the first and second load rolling element rolling paths and the rolling element direction changing path, respectively.
A telescopic device, wherein the rolling element direction changing paths on at least one side are arranged so as to intersect each other when viewed from the longitudinal direction. The telescopic device according to claim 1,
The moving body is provided with two sets of the first and second load rolling element rolling paths and the rolling element direction changing path, respectively.
The telescopic device, wherein the rolling element direction changing paths on at least one side are arranged so as not to cross each other when viewed from the longitudinal direction. The telescopic device according to claim 2 or 3,
The rolling element direction changing paths on one side are arranged so as to intersect with each other when viewed from the longitudinal direction, and the rolling element direction changing paths on the other side do not intersect with each other when viewed from the longitudinal direction. A telescopic device characterized by being arranged as described above. The telescopic device according to claim 3,
A shaft extending through the moving body in the longitudinal direction is disposed;
The telescopic device, wherein the shaft body is movable relative to the moving body in the longitudinal direction. The telescopic device according to claim 1,
The first extending member penetrates the moving body in the longitudinal direction;
A telescopic device, wherein the movable body is surrounded by the second extending member in a direction perpendicular to the longitudinal direction. The telescopic device according to claim 6,
A plurality of infinite circulation paths each including the first load rolling element rolling path, the second load rolling element rolling path, and the rolling element direction changing path are provided, and each of the infinite circulation paths is the first of the moving body. A telescopic device characterized in that it is disposed around the extending member in the circumferential direction with a space therebetween.

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