Linear guide device

Abstract

To provide a linear guide device with a dust-proof device between a rail member and a slider that suppress an influence on slide moving force with a simple constitution.SOLUTION: A linear guide device that consists of a long-sized rail member and a slider moving linearly along the rail member by a rotary body is provided with a seal member for filling a gap between the rail member and the slider on the side of the slider. The seal member has a side face seal part having a seal part formed in such a shape along a rolling surface that it approaches but does not contact the rolling surface, and then the side face seal part is installed movably between the slider and rail member, so that the side face seal part and the rail member are in either a contact state or a non-contact state while the slider is moving.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a linear guide device that mainly comprises a long rail member and a slider that moves along the rail member, and a dustproof device is installed between the rail member and the slider. [Background technology]

[0002] Conventionally, there has been a linear guide device consisting of a rail member that extends over a long distance with an approximately C-shaped cross section, and a slider that moves along the rail member.If dust or other debris gets between the rail member and the slider, the movement of the slider will become poor, so some devices have a dust prevention device (scraper) installed between the rail member and the slider (see, for example, Patent Document 1). Such a dustproof device is generally provided on a slider, and is in contact with the rail member to eliminate any gap between the rail member and the slider in order to enhance the dustproof effect. However, when the dustproof device is in contact with the rail member, there are problems such as an increase in the sliding force of the slider, and the dustproof device being in constant contact with the rail member, which makes it prone to deterioration. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7171999 Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above problems, an object of the present invention is to provide a dustproof device between a rail member and a slider in a linear guide device, which has a simple configuration and reduces the effect on the slide movement force. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention provides a linear guide device that mainly comprises a long rail member and a slider that moves along the rail member, the rail member having a substantially C-shaped cross section mainly consisting of a base plate and a pair of bent edges, the bent edges protruding in the same direction from both ends of the base plate, and the opposing surfaces of the bent edges being set as rolling sections, the slider mainly comprising a rotating body and a base material, the rotating body being supported by the base material and moving while rotating on a rolling surface set in the rolling section, and the base material moving linearly in the longitudinal direction of the rail member as it moves, the linear guide device having a seal member on the slider side, the seal member filling the gap between the rail member and the slider, the seal member having a shape that at least follows the rolling surface and has a side seal portion formed with a seal portion that is shaped so as to come close enough to the rolling surface without coming into contact with it, and the side seal portion being movably installed between the slider and the rail member, so that the side seal portion and the rail member can be in either a contacting or non-contacting state during movement of the slider.

[0006] Next, in order to solve the problem, the present invention is configured as a linear guide device mainly consisting of a long rail member and a slider that moves along the rail member, the rail member has a substantially C-shaped cross section mainly consisting of a base portion and a pair of bent edges, the bent edges are formed to protrude in the same direction from both ends of the base portion, and the opposing surfaces of the bent edges are set as rolling portions, the slider mainly consisting of a rotating body and a base material, the rotating body is supported by the base material and moves while rotating on the rolling surface set in the rolling portion, and as this movement occurs, the base material moves linearly in the longitudinal direction of the rail member. In the internal device, a sealing member is provided on the slider side, and this sealing member is intended to fill the gap between the rail member and the slider. The sealing member has a side sealing portion that is shaped to at least follow the rolling surface and has a sealing portion that is close enough to the rolling surface so as not to come into contact with it, and a long side sealing portion that is provided in the gap between the base material and the rail member. By installing at least the side sealing portion so that it can move between the slider and the rail member, the side sealing portion and the rail member can be in either a contacting or non-contacting state while the slider is moving.

[0007] The seal member is supported by the slider at the side seal portion, and the long side seal portion is not supported by either the rail member or the slider. [Effects of the Invention]

[0008] Since the seal member is movable, the sliding force is prevented from becoming heavy. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] Cross-sectional view of a slider. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 10 is an exploded perspective view of a linear guide device according to another embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

[0010] The best mode for carrying out the present invention will be described based on examples. [Example]

[0011] The present invention will now be described with reference to the accompanying drawings. For convenience, the left-right direction in FIG. 4, i.e., the linear movement direction, will be referred to as the front-rear direction or sliding direction, the up-down direction in FIG. 3 as the height direction or vertical direction, and the left-right direction in FIG. 3 as the horizontal direction. In the following description, the left side in FIG. 4 is the front side, and the right side is the rear side. In FIG. 1, reference numeral 100 denotes a linear guide device of the present invention, and the linear guide device 100 is mainly composed of a rail member 1, a slider member 2, a seal member 3, and an end cap 4.

[0012] The rail member 1 is a long member having a substantially C-shaped cross section. 5, the substantially C-shaped cross section is formed by a base portion 10 and a pair of bent edges 11, 11. The base portion 10 is a plate extending in the vertical direction, and a recess 101 is formed horizontally from one side in the vertical center. Bent edges 11, 11 are formed on both the top and bottom ends of the base portion 10, protruding horizontally on the side where the recess 101 is formed.

[0013] The bent edges 11 are formed as a pair, one above the other, as described above, and rolling portions 111, 111, which are semicircular recesses, are formed on the opposing surfaces of the bent edges 11, 11. The rolling portion 111 is formed by rolling surfaces 112, 112 that are curved in the concave direction and a recessed relief groove 113 formed near the intersection of the rolling surfaces 112, 112, and the rolling surfaces 112, 112 are formed symmetrically. The upper and lower rolling portions 111, 111 are formed symmetrically in the up-down direction. The rail member 1 of this embodiment is a long member made of an aluminum alloy and manufactured by extrusion molding. The manufacturing method and material are appropriately selected depending on the intended use, and it is of course also possible to manufacture it by bending a metal plate.

[0014] Then, on the rolling surfaces 112, 112 of the rail member 1 formed in this manner, the rotating body 21 of the slider 2, which will be described later, moves while rotating. The recess 101 has a mounting hole on the bottom surface of the recessed cross section for mounting the rail member 1 to an article, and the recess 101 is a place where the rail member 1 is fastened to the article with a screw or the like.

[0015] As shown in FIGS. 2 and 6, the slider 2 is mainly composed of a plate-shaped base material 20 and a plurality of rotors 21. The base material 20 is formed in the shape of a rectangular plate that is long in the sliding direction, and is provided with a plurality of shaft holes 201 corresponding to the rotors 21. The front and rear end faces are bent toward the rail member 1 to form support pieces 202, 202. As shown by the broken line in FIG. 3, the support piece 202 has a vertical height that fits between the pair of bent edges 11, 11 of the rail member 1, and a horizontal length that does not reach the base plate portion 10. The shaft holes 201 are holes for attaching the rotors 21, and in this embodiment, four shaft holes 201 are provided in the front-rear direction. The shaft holes 201 are provided at positions that are alternately offset in the vertical direction from the central axis in the sliding direction (the center of the rail member 1 in the vertical direction).

[0016] The rotating body 21 mainly consists of a rotating shaft 211 and rollers 222. The rollers 222 rotate around the rotating shaft 211 as their rotation axis. They are circular, have an axial hole in the center, and are donut-shaped. The outer circumferential surface of the circle is formed in a curved shape, and the curved portion serves as the contact surface 223, 223. The rotating shaft 211 is cylindrical and has a rotating portion 211A that holds the roller 222 in rotation, and a caulking portion 211B that is inserted into the shaft hole 201 of the base material 20 and that fixes the rotating body 21 to the base material 20. In this embodiment, the rotor 21 is of a ball bearing type in which a plurality of balls are held in the rotating portion between the rotary shaft 211 and the roller 222, thereby improving durability.

[0017] Then, the rotating body 21 is attached to the base material 20 by inserting the crimped portion 211B into the shaft hole 201 of the base material 20 and crimping. Since the shaft holes 201 are provided at positions that are eccentric in the vertical direction, the rotor 21 is also attached at a position that is eccentric in the vertical direction.

[0018] As shown in Figures 2 and 8, the sealing member 3 is mainly composed of a pair of side seal portions 30, 30 formed at a distance from each other in the front and rear, and a long side seal portion 31 which is a rectangular flat plate that is long in the front and rear direction and has a hollowed-out interior and is formed in an approximately square shape, and is molded integrally from synthetic resin material.

[0019] The side seal portion 30 is mainly formed by a rectangular parallelepiped opening seal portion 301 that is long in the vertical direction, a vertically elongated rectangular support hole 303 provided on one side of the left and right long side faces of the opening seal portion 301, and rolling portion seal portions 302, 302 that are formed to protrude in the vertical direction on the upper and lower end faces of the opening seal portion 301, respectively.

[0020] As shown in Figure 3, the opening seal portion 301 fits into the space 12 formed by the underside of the upper bent edge 11 of the rail member 1, the upper side of the lower bent edge 11, and the surface of the base portion 10 facing the recess 101, and is sized and shaped to be close to the upper and lower surfaces of the bent edge 11 that form the space, and the surface of the base portion 10 facing the recess 101. The rolling contact seal portion 302 protrudes in a semicircular shape so as to be close to the rolling contact surfaces 112, 112 of the rail member 1. In particular, if dust adheres to the rolling surface 112 on which the roller 222 rolls, it is likely to cause problems with the rolling of the roller 222, so the rolling portion seal portion 302 is shaped to fit along the rolling surface 112 and is placed close to it. As described above, the side seal portion 30 is shaped to close the inner surface of the approximately C-shaped cross section of the rail member 1 as much as possible, but is designed to be in close proximity to the rail member 1 so as not to come into contact with it. As shown in Figures 3 and 8, a large curved recess is provided on the surface of the opening seal portion 301 facing the support hole 303 to prevent the head of the screw from coming into contact with the opening seal portion 301 when attaching the rail member 1 to an article. Therefore, the side seal portion 30 does not close the recessed portion 101 that serves as the screw attachment portion of the rail member 1.

[0021] As shown by the dashed line in Figure 3, the support hole 303 is set to a size that allows the support piece 202 of the base material 20 to be inserted, and is larger than the support piece 202 so that the support piece 202 can move within the support hole 303.

[0022] The long side seal portion 31 is rectangular in size, close to the front-to-back length of the base material 20 and close to the height of the rail member 1, and its thickness is set to be approximately the same as the distance between the opposing surfaces of the base material 20 and the rail member 1, with the inside hollowed out to form a four-sided frame shape. As shown in Figure 2, the front and rear end faces of the short side are connected to the opposing surfaces of the opening seal portions 301, 301, respectively, and are connected so that the surface on the support hole 303 side and the surface of the long side seal portion 31 are flush with each other, and are molded integrally.

[0023] The seal member 3 thus formed is attached to the slider 2. First, the support holes 303, 303 of the seal member 3 are inserted into the support pieces 202, 202 of the slider 2, respectively, from the support holes 303, 303 side. Then, when the surface of the support hole 303 of the seal member 3 comes into contact with the base material 20 of the slider 2, the attachment of the seal member 3 is completed. At this time, since the rotating bodies 21 are positioned in hollowed-out areas inside the long side seal portion 31 in the shape of a four-sided frame, the rotating bodies 21 do not get in the way when the seal member 3 is attached.

[0024] As described above, the sealing member 3 is attached to the slider 2, but since the support hole 303 is formed larger than the support piece 202, the sealing member 3 can move up and down and back and forth relative to the slider 2 within the range in which the support piece 202 can move within the support hole 303. The sealing member 3 is also movable in the left-right direction (leftward in FIG. 3) facing the base material 20 side.

[0025] In this manner, the slider 2 and the seal member 3 are assembled, and the slider 2 with the seal member 3 attached is inserted from the end of the rail member 1 so that one side seal portion 30 is inserted into the space 12 of the rail member 1, then the rotating body 21... is inserted so that the contact surface 223 of the rotating body 21 contacts the rolling surface 112, and finally the other side seal portion 30 is inserted into the space 12 of the rail member 1. When the slider 2 is inserted into the rail member 1, the slider 2 moves on the rolling surface 112 while the contact surface 223 rotates, and the slider 2 becomes able to slide along the rail member 1 while the rotating body 21 rotates. Furthermore, since the rotating bodies 21 are eccentric in the vertical direction, the upper rotating body 21 moves on the upper rolling surface 112 and the lower rotating body 21 moves on the lower rolling surface 112, which makes it possible to distribute the load and reduce the vertical clearance of the slider 2, thereby making it possible to reduce the vertical vibration of the slider 2.

[0026] Furthermore, as mentioned above, the rolling portion 111 has an escape groove 113 between the rolling surfaces 112, 112, so that the upper and lower ends of the rotating body 21 do not come into contact with the rail member 1, and the rolling surface 112 comes into contact with the ground surface 223, as shown in Figure 7. The upper and lower ends of the rotor 21 in FIG. 7, i.e., the outer periphery of the rotor 21 with the largest diameter, become mating surfaces due to the molding of the rotor 21, and may not form a uniform arc due to the occurrence of burrs, etc. Therefore, when the upper and lower ends of the rotating body 21 do not come into contact with the rail member 1 as in this embodiment, the rotating body 21 can roll more smoothly. On the other hand, since the rotating body 21 is supported on the rolling surface 112 in a V-shape, it is possible to distribute the load on the rotating body 21. In addition, since the contact surface 223 of the rotating body 21 is supported from the left and right, the rotating body 21 can move linearly on the rolling surface 112 without swaying from side to side. In particular, if the upper and lower ends of the rotating body 21 come into contact with the rail members, the load tends to be concentrated on the upper and lower ends of the rotating body 21, which may lead to a decrease in the durability of the rotating body 21. The base material 20 has a function of attaching the rotating body 21 as well as the article to be moved, and is usually formed in a plate shape with appropriate mounting holes and the like.

[0027] Even if the slider 2 is attached in this manner, the slider 2 will fall off the end of the rail member 1, so an end cap 4 is attached to the end of the rail member 1. The end caps 4 are mainly made of synthetic resin, and are attached to the rail member 1 by engaging engagement pieces provided on the end cap 4 side with engagement holes provided on both ends of the rail member 1. The engaging pieces may be made of metal or may be fixed by screws depending on the strength required. Incidentally, if a device for restricting the forward and backward movement of the moving article is provided on the article side to which the linear guide device 100 is attached, the end cap 4 may not be used. In the drawing of this embodiment, the end cap 4 is attached only to the rear side.

[0028] As mentioned above, the side seal portion 30 of the seal member 3 is shaped to block the inner surface of the approximately C-shaped cross section of the rail member 1 as much as possible, making it difficult for dust and the like to enter the space 12 in which the rotating bodies 21... are located from the front and rear surfaces of the slider 2. The side seal portion 30 is set so as not to come into contact with the rail member 1 and is in a close proximity thereto, and therefore does not provide resistance when the slider 2 slides.

[0029] However, the positional relationship between the slider 2 rolling in the rolling portion 111 of the rail member 1 and the rotating body 21 is not necessarily constant during sliding movement. In particular, the straightness of the rail member 1 may vary slightly during manufacturing, processing, installation, etc., and the rotor 21 may also wear and cause some clearance between the rolling portion 111 and the rotor 21. Therefore, when the slider 2 slides, the slider 2 moves while slightly swaying up and down and left and right relative to the rail member 1. Therefore, since the side seal portion 30 is close to the rail member 1, the side seal portion 30 may come into contact with the rail member 1 during the vibration. However, even if it does come into contact, as mentioned above, the seal member 3 is attached so as to be movable relative to the base material 20, so even if the side seal portion 30 comes into contact with the rail member 1, the seal member 3 can move (escape) to a position where there is less resistance before it becomes a resistance. Therefore, the sliding force of the slider 2 can be minimized.

[0030] The long side seal portion 31 fills the gap between the side surface of the bent edge 11 of the rail member 1 (the right side surface in Figure 7) and the side surface of the base material 20 (the left side surface in Figure 7). The contact surface of the long side seal portion 31 is set so that it only slightly contacts the bent edge 11, forming a line contact that is long in the longitudinal direction and narrow in the vertical direction. Since the contact is close to a line contact in the longitudinal direction, i.e., in the sliding direction, there is no significant resistance when the slider 2 slides. In this way, it is made difficult for dust and the like to enter the space 12 in which the rotating bodies 21 are located through the gap.

[0031] In this embodiment, the substrate 20 is manufactured by press-molding a thin steel plate, but the substrate 20 is not smooth and may be slightly warped. Therefore, the gap distance between the base material 20 and the bent edge 11 may not be constant. Therefore, even if the long side seal portion 31 is set so that it slightly contacts the bent edge 11, depending on the smoothness of the base material 20, the gap between the base material 20 and the bent edge 11 may not be filled by the long side seal portion 31, and a slight gap may appear. The objective of the present invention is not to completely eliminate gaps to achieve dustproofing, but to enhance the dustproofing effect while minimizing the impact on the sliding force, so a slight gap is within the acceptable range, and the present invention does not aim to seal with a sealing member.

[0032] On the other hand, the rotating body 21 is fixed to the base material 20 at the crimped portion 211B of the rotating shaft 211, but there is some clearance between the rotating portion 211A and the rotating shaft 211, and the rotating portion 211A rattles relative to the rotating shaft 211. This is necessary so that the rotating portion 211A can rotate smoothly. Therefore, as mentioned above, the rotating bodies 21... are designed to minimize their vertical and horizontal vibration relative to the rail member 1, so that the rotating part 211A is fixed to a certain extent, and the rotating shaft 211 vibrates relative to the rotating part 211A. As a result, the base material 20 to which the rotation shaft 211 is fixed vibrates to some extent, and specifically, in the state shown in FIG. 7, the upper and lower ends of the base material 20 vibrate in the left and right directions.

[0033] When the upper and lower ends of the base material 20 swing left and right in this way, the gap between the base material 20 and the bent edge 11 widens or narrows, and when the gap narrows, the long side seal portion 31 is pressed against the base material 20. However, as mentioned above, the long side seal portion 31 is in near line contact with the bent edge 11, so unless the swing is large, even if it is pressed, it does not create much resistance and does not hinder the movement of the slider 2. Normally, measures are taken on the article side where the linear guide device is used to prevent the slider 2 from vibrating too much.

[0034] As described above, the long side seal portion 31 is not supported or fixed to the base material 20, and therefore can move (deform) between the base material 20 and the bent edge 11 within the elastic deformation of the synthetic resin material. In particular, the long side seal portion 31 is in the form of a thin plate, and therefore is easily deformed. As mentioned above, the side seal portion 30 is supported so as to be movable in the left-right direction relative to the base material 20. Therefore, even if the base material 20 sways left-right in this manner, the side seal portion 30 is prevented from following the swaying of the base material 20, and therefore it is possible to prevent the side seal portion 30 from coming into contact with the rail member 1 and increasing resistance. Furthermore, since the long side seal portion 31 is not supported or fixed to the base material 20 and has a shape that is easily deformed, it is unlikely to hinder the movement of the connected side seal portion 30.

[0035] In this way, the sealing member 3 is attached in a movable manner (with some play), so it is not affected by subtle movements of the slider 2, and even if it comes into contact with the rail member 1, it can move (escape) to a location with less resistance, thereby reducing the effect on the sliding movement force of the slider 2. In particular, if the side seal portion 30 is movable relative to the slider 2, it is possible to suppress the influence on the sliding movement force of the slider 2. If it were not movable, when the side seal portion 30 touches the rail member 1 inside the C-shape of the rail member 1, it would cause resistance, or the side seal portion 30 would be unable to escape and would become caught in a pinched position, resulting in a large sliding force. Therefore, the seal member 3 in this embodiment is molded from a hard synthetic resin material. Since it has better sliding properties than soft synthetic resins, it is more suitable for suppressing the effect on the sliding force, which is the subject of the present application.

[0036] In this embodiment, the slider 2 is slidable even if the seal member 3 is not attached. Furthermore, since the seal member 3 is simply inserted into the support piece 202, it is possible to later attach the seal member 3 to a linear guide device that does not have the seal member 3 attached. Therefore, it is possible to prepare a linear guide device without the sealing member 3 and to attach the sealing member as required, which not only reduces the number of linear guide devices in stock but also has the effect of making it easier to manage the production lot of the linear guide device. It is also possible to add a sealing member 3 to an article that is being used without a sealing member 3 later, or to use an article that is being used with a sealing member 3 without the sealing member 3.

[0037] FIG. 9 shows a seal member 3 that is made up of only side seal portions 30, 30. In the case of a linear guide device, foreign matter such as dust and dirt is likely to have a negative effect on sliding movement when it accumulates on the rolling surface 112 of the rail member 1. When the roller 222 runs on the rolling surface 112, the foreign matter adheres to the contact surface 223, preventing the roller 222 from rolling smoothly. Therefore, the rolling portion seal portion 302 adjacent to the rolling surface 112 has the function of scraping out foreign matter from the rolling surface 112 to prevent foreign matter from adhering to the contact surface 223, and the function of making it difficult for foreign matter to enter the contact surface 223. In addition, if foreign matter enters the rotor 21 through the large opening of the space 12 and adheres to the vicinity, the rotation of the rotor may become impaired due to the foreign matter. Therefore, the configuration in FIG. 9 is such that the sealing member 3 has only the side seal portions 30, 30, and fills in the areas that are most likely to be adversely affected by the sliding movement. This allows the size of the sealing member to be reduced, making it easier to produce at low cost. It also makes it easier to accommodate changes in the front-to-rear length of the slider. However, although the gap where the long side seal portion 31 is disposed is not large, a configuration having the long side seal portion 31 is more suitable for reducing the influence of sliding on foreign matter.

[0038] The linear guide device of the present invention can be used in a vertical direction as shown in FIG. 3, or can be rotated 90 degrees to be used in a horizontal direction, or can be used at an angle. It is also possible to use the slider attached to a fixed article and the rail member attached to a moving article.

[0039] As described above, the linear guide device of the present invention is not limited to drawer-type storage furniture, but can be used in a wide range of devices that move items in a linear manner, such as movable panels, grills on kitchen counters, paper trays in copiers, automobile consoles, and server racks. [Explanation of symbols]

[0040] 100 Linear guide device 1 Rail member 10 Circuit board 101 recess 11 Bent Edge 111 Rolling part 112 rolling surface 113 Relief groove 12 Space 2 Slider 20 Base material 201 Shaft hole 202 Support piece 21 Rotating body 211 Rotation axis 211A Rotating part 211B Crimping part 222 Roller 223 Ground plane 3 Sealing material 30 Side seal 301 Opening seal 302 Rolling part seal part 303 Support hole 31 Long side seal 4 End Caps

Claims

1. a linear guide device consisting mainly of a long rail member and a slider that moves along the rail member, wherein the rail member has a substantially C-shaped cross section consisting mainly of a base plate and a pair of bent edges, the bent edges protruding in the same direction from both ends of the base plate, and the opposing surfaces of the bent edges are set as rolling parts, and the slider is mainly composed of a rotating body and a base material, the rotating body is supported by the base material and moves while rotating on a rolling surface set in the rolling part, and as the slider moves, the base material moves linearly in the longitudinal direction of the rail member, and the linear guide device has a seal member on the slider side, which seal member fills the gap between the rail member and the slider, and the seal member has a side seal portion formed with a shape that at least follows the rolling surface and is shaped so that it comes close enough to the rolling surface without coming into contact with it, and by installing the side seal portion movably between the slider and the rail member, the side seal portion and the rail member can be in either a contacting or non-contacting state during movement of the slider,

2. a linear guide device consisting mainly of a long rail member and a slider that moves along the rail member, wherein the rail member has a substantially C-shaped cross section consisting mainly of a base plate and a pair of bent edges, the bent edges protruding in the same direction from both ends of the base plate, and the opposing surfaces of the bent edges are set as rolling parts, and the slider is mainly composed of a rotating body and a base material, the rotating body is supported by the base material and moves while rotating on a rolling surface set as the rolling part, and as the slider moves, the base material moves linearly in the longitudinal direction of the rail member; and a linear guide device wherein a seal member is provided on the slider side, the seal member is for filling the gap between the rail member and the slider, and the seal member has a side seal portion that is shaped to at least follow the rolling surface and is formed with a seal portion that is shaped to come close enough to the rolling surface so as not to come into contact with it, and a long side seal portion that is provided in the gap between the base material and the rail member, and by installing at least the side seal portion movably between the slider and the rail member, the side seal portion and the rail member can be in either a contacting or non-contacting state during movement of the slider.

3. 3. The linear guide device according to claim 2, wherein the seal member is supported by the slider at the side seal portions, and the long side seal portions are not supported by either the rail member or the slider.

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