JP6392176B2 - Rail slider unit - Google Patents

Description

  The present invention relates to a rail slider unit that relatively slides two objects.

  Patent Document 1 provides a slide rail unit that can be formed easily and easily without the need to provide a separate member for manufacturing the inner rail holding mechanism with respect to the outer rail, and can be produced at low cost. It is described. The slide rail unit includes a first rail member having a pair of flange portions each having a base portion and a ball rolling surface, a second rail member having substantially the same shape as the first rail member, and a first rail member, A ball disposed between the second rail member and a rail guide member fixed to the first rail member and having a diameter substantially the same as the diameter of the ball, the second rail member having a flange portion; A protrusion formed on the leading edge and projecting on the ball rolling surface is formed, and a notch portion on which the protrusion is engaged with the second rail member is formed on the rail guide member, and the second rail member is The base portion of the second rail member is assembled to the first rail member so that the base portion can be displaced in a direction close to that of the first rail member.

JP 2012-241857 A

  A device or system called a slide rail or a rail slider in which a rail and a rail are combined is used as a member that linearly guides the article with a low frictional force with respect to the articles or a fixed object such as a table. There is a need for a rail slider that has a ball (ball bearing) between the rails and that transfers the ball, and that has a simple configuration that eliminates the ball, has high accuracy, and is low in cost. .

  One embodiment of the present invention is a rail slider unit having an outer frame extending in the longitudinal direction and an inner frame that slides relatively inside the outer frame. The outer frame includes a pair of outer rails, and the inner frame includes a pair of inner rails, and includes a pair of inner rails that slide relative to each other while part of the outer surfaces are in contact with part of the inner surfaces of the pair of outer rails. Each outer surface of the inner rail includes a convex surface protruding outward, and each inner surface of the outer rail has a first surface and a second surface in contact with a part of the convex surface with the convex surface of the outer surface of the inner rail interposed therebetween. including. The outer frame includes a first member that forms the first surface and the second surface, and an inclined surface that is located outside the first member and corresponds to the first surface and the second surface. The inner frame includes a convex member that forms a convex surface, and a support member that supports the convex member so that the convex member is pressed outward by a plurality of elastic members.

  This rail slider unit is a type that slides inside the outer rail of the outer frame while the inner rail of the inner frame is in contact with the outer rail, and does not require a ball to be transferred between the outer rail and the inner rail. is there. The outer rail includes a first surface and a second surface that are in contact with each other with the convex surface of the outer surface of the inner rail interposed therebetween. The outer rail stabilizes the movement of the inner rail and distributes the load during sliding to reduce the frictional force generated during sliding. Reduce. Further, the outer frame constituting the outer rail is located on the outer side of the first member and the first member forming the first surface and the second surface of the outer rail, and the first surface and the second surface. And a second member having a slope corresponding to the surface. As the first member, it is possible to select a member that exhibits low frictional resistance when sliding with the inner rail, or to select such a shape and configuration. As the second member, select a high-strength (high-rigidity) member that receives a load between the inner rail and the outer rail as an outer rail, and does not easily cause an element that hinders the running of the inner rail such as distortion, Such a shape and configuration can be selected. Moreover, since it comprises with a some member, since the manufacturing and processing method suitable for each member can be selected, the manufacturing tolerance of an outer rail is easy to be reduced.

  The inner frame constituting the inner rail includes a convex member that forms a convex surface and a support member that supports the convex member, and a plurality of elastic members are sandwiched between the support member and the convex member so that the convex surface of the inner rail. The contact condition between the member and each surface of the first member of the outer rail can be finely adjusted. For example, by inserting an appropriate elastic member during assembly of the rail slider unit, manufacturing tolerances are reduced, and displacement (unbalance) occurs in the friction resistance (slide load, slide load) between the outer rail and the inner rail. Can be reduced. In addition, it is possible to reduce the secular change caused by wear during use of the rail slider unit.

  The convex member and the support member may be the same material. Further, as the convex member, a member that exhibits low frictional resistance when sliding with the outer rail may be selected, or such a shape and configuration may be selected. As the support member, it is possible to select a high-strength member that receives a load between the outer rail and the inner rail, and is unlikely to generate an element that hinders running such as distortion.

  The plurality of elastic members may be arranged on the front and rear and the left and right along the longitudinal direction. By arranging the elastic members before and after the convex member serving as the left and right inner rails and the first member serving as the outer rail, it is easy to adjust the balance of the contact state between the left and right inner rails and the outer rails.

  An example of the elastic member is a spring spring. The elastic member may be a leaf spring, but the retraction spring is one of the elastic members that can easily adjust the distance between the convex member and the support member.

  The convex surface includes a surface protruding in an arc shape in contact with each of the first surface and the second surface, and the first surface and the second surface are surfaces protruding with a curvature radius larger than the curvature radius of the protruding surface. It may include a concave surface that touches. By providing the concave surface generated by wear in advance, the shape change due to wear is small, and the secular change of the friction coefficient between the outer rail and the inner rail can be suppressed.

  The first member may include a groove extending along the longitudinal direction between the first surface and the second surface. When the lubricant is injected between the inner rail and the outer rail, this groove can be a path for allowing the lubricant to penetrate into the rail. Further, since the member forming the first surface of the first member and the member forming the second surface are connected by the groove with low rigidity, each member is the second member of the second member having high molding accuracy. It closely adheres to the slopes corresponding to the first surface and the second surface. Therefore, the contact accuracy between the rails can be improved, and a rail slider unit with little variation in frictional resistance can be provided.

  The first member of the outer frame is typically a resin having a small friction coefficient, and the first member may have a rigidity lower than that of the convex member. By sliding the convex surface of the convex member having high rigidity between the first surface and the second surface of the first member having low rigidity, the frictional resistance can be reduced.

  The outer frame includes a plurality of pairs of outer rails that are intermittently connected in the longitudinal direction, and the inner frame is a plurality of members that are intermittently connected in the longitudinal direction and slide inside each of the plurality of pairs of outer rails. A pair of inner rails may be included. By disposing the combination of the outer rail and the inner rail intermittently in the longitudinal direction, the contact accuracy between the outer rail and the inner rail can be controlled in each combination, and friction is achieved by distributing the load in multiple combinations. Resistance can be reduced.

  A typical configuration in which the combination of the outer rail and the inner rail is intermittently arranged in the longitudinal direction is provided in the inner frame, on the outer side of the supporting member continuous in the longitudinal direction, a plurality of convex members interrupted in the longitudinal direction are provided, The plurality of convex members are supported so as to be pressed outward by the elastic members, respectively, and in the outer frame, the plurality of first members that are intermittent in the longitudinal direction are provided inside the second member that is continuous in the longitudinal direction. In addition, an opening is formed between the first members.

The perspective view which shows the structure of a rail slider unit. The top view which shows the structure of a rail slider unit. Sectional drawing which shows the structure of a rail slider unit. The perspective view which expands and shows the components which comprise a rail slider unit. The schematic diagram which expands and shows the cross section of the rail slider unit shown in FIG.

  FIG. 1 is a perspective view showing a schematic configuration of the rail slider unit 10. The rail slider unit (rail slider) 10 is also called a slide rail or the like, and is a part suitable for linearly moving a mounted article with a low friction load. For example, it is used as a unit that moves the lens built in the projector, and it is used to move parts and parts such as stages in a linear direction in machine tools, industrial robots, and manufacturing equipment. Used for various purposes.

  FIG. 2 is a plan view showing the configuration of the rail slider unit (rail slider) 10. FIG. 3 is an enlarged cross-sectional view of the configuration of the rail slider 10. FIG. 4 shows the components constituting the rail slider 10 in an expanded manner.

  The rail slider 10 has an outer frame 11 extending in the longitudinal direction and an inner frame 12 that slides relatively inside the outer frame 11. Typical dimensions of the rail slider 10 are 90 mm in the longitudinal direction, 25 mm in the lateral direction (width direction), and about 8 mm in thickness, and the inner frame 12 is 10 mm before and after the outer frame 11 in the longitudinal direction. It is possible to slide about 20 mm in total. In addition, these dimensions are examples and are not limited.

  The outer frame 11 includes inner rails 21 arranged on the inner side in the longitudinal direction and on the left and right sides in the width direction. The outer rails 21 are a pair of left and right rails, and the outer frame 11 includes two pairs of outer rails 21 that are disposed in the front-rear direction. Each of the pair of outer rails 21 has a symmetrical configuration.

  The inner frame 12 includes inner rails 51 disposed on the outer side in the longitudinal direction and on the left and right sides in the width direction. The inner rails 51 are paired with left and right rails 51, and the inner frame 12 includes two pairs of inner rails 51 that are arranged intermittently in the front and rear direction. Each of the pair of inner rails 51 has a symmetrical configuration.

  As shown in the enlarged sectional view of FIG. 5, each inner rail 51 slides relatively while a part of the outer surface 52 is in contact with a part of the inner surface 22 of the outer rail 21. The outer surface 52 of the inner rail 51 includes a convex surface 53 protruding outward, and the inner surface 22 of the outer rail 21 has a first surface 23 and a second surface 24 in contact with a part of the convex surface 53 with the convex surface 53 interposed therebetween. including. The outer frame 11 is positioned on the outer side of the first member (outer guide) 20 that forms the first surface 23 and the second surface 24 of the outer rail 21, and the outer surface 20. And a second member (rail outer) 40 having inclined surfaces 45 corresponding to the two surfaces 24, respectively.

  The inner frame 12 includes a convex member (inner guide) 50 that forms the convex surface 53 of the inner rail 51, and a support member (rail inner) 60 that supports the inner guide 50 to be pressed outward by a plurality of elastic members 70. Including.

  The outer rail 11 of the outer frame 11 is a member attached to one of the objects to be slid relative to each other, and is a flat member extending in the longitudinal direction as a whole, and both ends in the width direction constitute the outer rail 21. And it has a V shape protruding outward to support it. The rail outer 40 includes a base part (base part) 42 including a mounting surface fixed to an object by screws or the like, and V-shaped side wall parts extending in the longitudinal direction along the base part 42 on both sides in the width direction of the base part 42. (Flange part) 43 and the end wall part 44 provided in the both ends of the longitudinal direction of the base 42 are included.

  The end wall portion 44 is a portion that is bent to prevent the inner frame 12 from coming out of the outer frame 11 after the inner frame 12 is set on the outer frame 11. The side wall portion 43 includes a concave (V-shaped) slope 45 corresponding to the first surface 23 and the second surface 24 of the first member (outer guide) 20 on the inner side. The rail outer 40 is formed in a C shape with a cross section in a plane perpendicular to the longitudinal direction having an opening on the side opposite to the base 42. The rail outer 40 is made of metal, and is processed into a predetermined shape from a flat plate member, for example, a rolled steel plate, by pressing.

  The outer guide 20 set inside the outer rail 40 includes a portion 35 that constitutes the outer rail 21 that is arranged in the front and rear, and a portion 31 that connects the portion 35 that constitutes the outer rail. The portion 35 constituting the outer rail includes an outer surface 25 that is in close contact with the rail outer 40 and an inner surface 22 that includes the first surface 23 and the second surface 24 that form the outer rail 21, and the cross-sectional shape is the rail outer 40. It is a letter shape that wants to protrude to the side.

  The portion 31 connecting the portions 35 constituting the outer rails on both sides (front and rear) in the longitudinal direction has a shape protruding outward from the portion 35 constituting the outer rail by being recessed outward from the portion 35 constituting the outer rail. It has become. Due to the recessed shape 33 and the material of the outer guide 20 described later, the portions 35 constituting the outer rails on both sides are elastically connected. The connecting portion 31 fits into an opening 46 provided in the center in the longitudinal direction of the rail outer 40 and fulfills the function of determining the position of the outer guide 20 with respect to the rail outer 40. In the outer guide 20, a portion 32 that protrudes outward is also provided on the portion 35 that constitutes the outer rail, and the outer guide 20 performs a positioning function by being fitted into the opening 47 provided in the rail outer 40. .

  The opening 46 provided in the side wall 43 of the rail outer 40 serves as a positioning function, and also functions as an opening for separating the side wall 43 in the front and rear directions. Therefore, the side wall 43 can be easily bent with respect to the base 42, and the bending of the side walls 43 on both sides of the opening 46 can be individually adjusted, so that the bending accuracy of the side wall 43 can be easily increased. Easy to increase.

  The outer guide 20 is less rigid than the outer rail 40 but has a smaller coefficient of friction, and a low frictional resistance is realized by combining a steel material constituting the inner guide 50, for example, an aluminum alloy, particularly an aluminum-magnesium alloy having high strength and corrosion resistance. A member that can be formed, for example, a resin called engineering plastic. The outer guide 20 further forms the outer rail 21 by the first surface 23 and the second surface 24. Therefore, in addition to good slidability (friction characteristics), the outer guide 20 extends along the inclined surface 45 of the second member 40. Flexibility to adapt, durability against environmental changes (hygroscopicity, thermal expansion), etc. are required. As the resin for the outer guide 20, a crystalline thermoplastic resin is suitable, and examples thereof include materials such as POM (polyoxymethylene) and semicrystalline polyamide. An example of the semi-crystalline polyamide is a semi-crystalline polyamide manufactured by Solvay, trade name: Amodel®. The combination of the outer guide 20 and the inner guide 50 is not limited to this, For example, you may replace the material of the outer guide 20 and the inner guide 50. FIG. Moreover, you may form the outer guide 20 with a metal.

  The inner frame 12 that slides inside the outer frame 11 includes an inner guide 50 that slides in contact with the outer guide 20, a rail inner 60 that supports the inner guide 50, and an inner guide 50 that is outside the rail inner 60. And an elastic member 70 that pressurizes the elastic member 70. The rail inner 60 includes a base part (base part) 61 including a surface to which the other object to be slid is attached by screwing or the like, and a side wall part (flange part) extending from both sides of the base part 61 along the longitudinal direction. 62. The rail inner 60 has a U-shaped cross section perpendicular to the longitudinal direction, and can be formed by pressing from a flat metal member such as a rolled steel plate.

  The inner guide 50 attached to the outer side of the side wall part 62 of the rail inner 60 has a plate-like body 55 arranged along the flat outer surface 63 of the side wall part 62 and an outer surface 52 of the plate-like body 55 facing outward. And a convex portion 56 including the protruding convex surface 53. These convex portions 56 are positioned at both ends of the plate-like body 55 in the longitudinal direction, extend along the longitudinal direction, and constitute an inner rail 51 that is disposed intermittently in the front-rear direction. Each convex-shaped part 56 slides within the range of each outer rail 21 arrange | positioned back and forth on both sides of the connection part 31 of the outer guide 20. As shown in FIG.

  The inner guide 50 further includes a plurality of protrusion pairs 57 provided so as to protrude inward in the vicinity of the upper and lower edges of the plate-like body 55, and a support bar provided so as to protrude inwardly before and after the plate-like body 55. Axis) 58. The inner guide 50 is attached to the rail inner 60 so as to move in the width direction, and the protrusion pair 57 is inserted into an opening pair 64 provided at a corresponding position of the rail inner 60, and the inner guide 50 with respect to the rail inner 60. The function to determine the position of the. The support bar 58 is inserted into a hole 65 provided at a corresponding position of the rail inner 60 and functions as a shaft that supports the elastic member 70.

  The inner guide 50 is typically formed by die-casting a metal raw material such as a zinc alloy or an aluminum alloy. By forming the inner guide 50 by die-casting, the dimensional accuracy is good, the shape of the convex surface 53 can be smoothed, and excellent sliding performance as the inner rail 51 can be exhibited. When the inner guide 50 is not required to be so strong, the inner guide 50 may be formed of resin or the like, and the rail slider 10 can be provided at a lower cost.

  The member 70 that elastically supports the inner guide 50 with respect to the rail inner 60 is typically a spring (disc spring) 70. By inserting the hole 71 of the disc spring 70 into the shaft 58 of the inner guide 50 and installing it between the rail inner 60 and the inner guide 50, it is provided at four locations on the front, rear, left and right along the longitudinal direction of the inner frame 12. A disc spring 70 can be arranged. By interposing the disc spring 70 between the rail inner 60 and the inner guide 50 and changing the thickness of the disc spring 70, the distance between the rail inner 60 and the inner guide 50 can be adjusted. For this reason, the contact area or contact pressure between the inner guide 50 and the outer guide 20 can be adjusted. Therefore, the difference in frictional resistance due to manufacturing tolerances and the occurrence of rattling can be suppressed, and further the fluctuation of frictional resistance and the occurrence of rattling due to aging can be suppressed.

  The rail inner 60, the inner guide 50, the outer guide 20, and the rail outer 40 have tolerances, and the dimensions may be slightly different depending on the production lot. By preparing several types of disc springs 70 having slightly different thicknesses, and selecting the thickness of the disc springs 70 attached to the front, rear, left and right for each lot, and using the optimum combination of disc springs 70, the rail slider 10 of the production lot is manufactured. It becomes possible to absorb the difference in performance. Therefore, it is possible to provide the rail slider 10 in which the frictional resistance is within a predetermined range without using a ball bearing.

  By disposing the disc spring 70, which is an elastic member, between the rail inner 60 and the inner guide 50, the inner guide 50 can be pressed against the first surface 23 and the second surface 24 of the outer guide 20. For this reason, a load (friction resistance) can be applied between the outer rail 21 and the inner rail 51 in advance, and the initial load when the rail slider unit 10 is slid can be made constant. . Therefore, it is possible to provide the rail slider 10 that is easy to control the position when the object is slid.

  The disc spring 70 has a small installation space, and can control the height (select by the height) to keep the elastic force within a certain range. Therefore, it is suitable as an elastic body installed between the rail inner 60 and the inner guide 50.

  As shown in an enlarged view in FIG. 5, the rail slider 10 includes an inner rail 51 including a convex surface 53 and a first surface 23 combined in a V shape toward the outside so as to sandwich the convex surface 53 vertically. The combination with the outer rail 21 including the second surface 24 allows the inner frame 12 and the outer frame 11 to slide relative to each other without sandwiching the ball. Since the first surface 23 and the second surface 24 formed in a V shape of the outer guide 20 constituting the outer rail 21 sandwich the convex surface 53 of the inner guide 50 constituting the inner rail 51, The inner frame 12 can be slid while being held at a predetermined position near the center of the outer frame 11 so as to face the left and right loads, and the load during sliding can be distributed in four directions. The inclination angle of the first surface 23 and the second surface 24 is typically 45 degrees. However, when the direction of the load applied to the rail slider 10 is known in advance, the inclination varies depending on the direction. It is also possible to provide a rail slider 10 with an angle. A typical range of the inclination angle is about 30 to 60 degrees.

  In the rail slider 10, the outer guide 20 constituting the outer rail 21 is disposed inside the rail outer 40 having high rigidity and small manufacturing tolerances, and the rail outer 40 is provided with the first surface 23 and the second surface 24. Corresponding support surfaces (slopes) 45 are provided, and the load of the inner rail 51 is received by the rail outer 40 via the outer guide 20. Therefore, as the outer guide 20, it is possible to select a material having less frictional resistance and higher durability than the rigidity and manufacturing accuracy in combination with the inner guide 50. In this example, the outer guide 20 which is resinous and has a small friction coefficient and durability, but has lower rigidity than the rail outer 40 can be employed. Furthermore, the manufacturing cost of the rail slider 10 can be reduced by limiting the range of use of materials that are likely to be expensive, such as engineering plastics having low friction coefficient and high durability.

  The first surface 23 and the second surface 24 of the outer guide 20 are each a radius of curvature of a portion 54 that protrudes in contact with the first surface 23 and the second surface 24 of the convex surface 53 of the inner guide 50. It includes a recessed portion 29 with a radius of curvature r2 greater than r1. The rail slider 10 slides while the protruding portion 54 of the inner guide 50 with the curvature radius r1 contacts the recessed portion 29 of the outer guide 20 with the curvature radius r2. The contact portion between the outer guide 20 and the inner guide 50 is inevitably worn out by sliding. By forming the surface of the outer guide 20 in a worn state in advance, it is possible to suppress fluctuations in frictional resistance due to wear. Furthermore, since the inner guide 50 is pressed against the first surface 23 and the second surface 24 by the disc spring 70, which is an elastic member, fluctuations in frictional resistance due to wear can be suppressed.

  The outer guide 20 includes a groove 26 extending along the longitudinal direction at the apex (valley) between the first surface 23 and the second surface 24 combined in a V shape. By using this groove 26, the lubricant for reducing the friction between the outer rail 21 and the inner rail 51 can be dispersed in the longitudinal direction, and the frictional force between the outer rail 21 and the inner rail 51 can be further reduced. An example of the lubricant is quick-drying dry grease, and the injected lubricant is dispersed in the longitudinal direction through the grooves 26, whereby a uniform lubricating film can be formed on the sliding contact portions of the outer guide 20 and the inner guide 50. .

  The groove 26 functions to reduce the thickness of the connecting portion between the first portion 27 on the side including the first surface 23 of the outer guide 20 and the second portion 28 on the side including the second surface 24. . Accordingly, the first portion 27 and the second portion 28 have a low connection strength, and the portions 27 and 28 of the resin outer guide 20 are in close contact with the inclined surface 45 of the rail outer 40, so that the manufacturing accuracy of the rail outer 40 is improved. Accordingly, the positional accuracy of the first surface 23 and the second surface 24 of the outer guide 20 can be controlled. By supporting the first portion 27 and the second portion 28 of the outer guide 20 having low rigidity by the inclined surface 45 of the rail outer 40 having high rigidity, the dimensional accuracy of the outer rail 21 can be improved. The rail slider 10 with little variation can be provided.

  In order to keep the friction resistance small in the rail slider 10 in which the outer guide 20 and the inner guide 50 are brought into contact with each other and slid without using a ball, it is important to ensure the dimensional accuracy of the contact portion. In order to reduce the frictional resistance, it is necessary to reduce the load (load) applied to the contact portion, and the length of the contact portion is also necessary. On the other hand, when the contact portion becomes long, it becomes difficult to ensure the accuracy. In this rail slider 10, a plurality of outer rails 21 and two inner rails 51 in this example are arranged on the front and rear sides, and the load is distributed by combining the rail sliders 10 by shortening the respective rails. The accuracy of the contact part of the rail is ensured.

  In the rail slider 10, the outer rail 21 employs a configuration in which the outer guide (first member) 20 is coupled by a portion 31 that flexibly connects the portions 35 constituting the two outer rails. By connecting the front and rear of the second member) 40 with an opening 46 that also serves as a positioning, the accuracy of the outer rails 21 arranged in the front and rear can be managed independently or to some extent independent. In the inner rail 51, the convex portions 56 of the inner guides (convex surface members) 50 that form the front and rear inner rails 51 are connected by a plate-like body 55, and the rail inner (supporting member) 60 of each convex portion 56 is connected. The position can be controlled by a disc spring 70. Accordingly, it is possible to adjust the contact state between the front and rear left and right outer rails 21 and the inner rail 51 almost independently, and the outer rail 21 and the inner rail 51 are in contact with each other and slide with low frictional resistance. Therefore, a suitable condition can be generated.

  In addition, the combination of the outer rail 21 and the inner rail 51 may be one, and the combination of the three or more outer rails 21 and the inner rails 51 may be arrange | positioned forward and backward.

  The rail slider unit 10 is suitable for a mechanism that linearly moves an object in a projector lens moving mechanism, a machine tool, an industrial robot, and the like, and can be applied to a wide range of fields.

10 rail slider unit 11 outer frame, 12 inner frame 20 first member (outer guide), 21 outer rail 40 second member (rail outer),
50 Convex surface member (inner guide), 51 Inner rail 60 Support member (rail inner)
70 Elastic member (breather spring)

Claims (8)

An outer frame extending in the longitudinal direction; and an inner frame that slides relatively within the outer frame;
The outer frame includes a pair of outer rails,
The inner frame is a pair of inner rails, and includes a pair of inner rails that slide relative to each other while a part of the outer surface is in contact with a part of the inner surfaces of the pair of outer rails,
The outer surface of each of the inner rails includes a convex surface protruding outward;
The inner surface of each of the outer rails includes a first surface and a second surface sandwiching the convex surface and in contact with a part of the convex surface,
The outer frame includes a first member that forms the first surface and the second surface;
A second member located outside the first member, comprising a slope corresponding to the first surface and the second surface, and having a higher rigidity than the first member;
The inner frame includes a convex member that forms the convex surface,
A rail slider unit, comprising: a support member that supports the convex member so as to press outward by a plurality of elastic members. In claim 1,
The plurality of elastic members are rail slider units that are arranged on the front and rear and the left and right along the longitudinal direction. In claim 1 or 2,
The rail slider unit, wherein the elastic member is a spring. In any of claims 1 to 3,
The convex surface includes a surface protruding in an arc shape in contact with the first surface and the second surface,
The rail slider unit, wherein the first surface and the second surface include a concave surface in contact with the protruded surface with a radius of curvature larger than a radius of curvature of the protruded surface. In any of claims 1 to 4,
The rail slider unit, wherein the first member includes a groove extending along a longitudinal direction between the first surface and the second surface. In any of claims 1 to 5,
The first member is a rail slider unit whose rigidity is lower than that of the convex member. In any one of Claims 1 thru | or 6.
The outer frame includes a plurality of the pair of outer rails connected intermittently in the longitudinal direction,
The inner frame includes a plurality of the pair of inner rails that are intermittently connected in a longitudinal direction and slide inside the pair of outer rails, respectively. In claim 7,
The inner frame includes a plurality of convex members interrupted in the longitudinal direction on the outside of a support member continuous in the longitudinal direction, and the plurality of convex members are supported so as to be pressurized outward by the elastic members, respectively. ,
The outer frame includes a plurality of the first members intermittent in the longitudinal direction inside the second member that is continuous in the longitudinal direction, and an opening is formed between the first members. , Rail slider unit.

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