JP2012241857A - Slide rail unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide rail which does not require the installation of another member, can be simply and easily formed and can be produced at a low cost in relation to the fabrication of a retention mechanism of an inner rail with respect to an outer rail.SOLUTION: The slide rail unit includes: a first rail member having a pair of flange parts each of which has a base part and a ball rolling surface; a second rail member having a shape substantially equal to that of the first rail member; a ball arranged between the first rail member and the second rail member; and a rail guide member which is fixed to the first rail member and is formed so as to have a diameter substantially equal to the ball diameter, wherein a protrusion part which is formed on the top edge part of the flange part and is protruded on the ball rolling surface is formed on the second rail member, a notch part with which the protrusion part is engaged is formed on the rail guide member while the second rail member is housed in the first rail member, the second rail member is assembled to the first rail member such that the base part of the second rail member can be moved in the direction coming close to the base part of the first rail member.

Description

  The present invention relates to a slide rail unit that is provided between a pair of members that relatively reciprocate along a predetermined direction, such as a drawer in furniture, for example, and supports the relative forward and backward movement of these members.

  Conventionally, a slide rail unit including an outer rail and an inner rail is known as a guide member for supporting the advancing and retreating movement of a movable member such as a drawer in furniture or a system kitchen (Patent Document 1). Specifically, an outer rail having a base portion and a pair of flange portions which are bent and raised along the longitudinal direction of the base portion and provided with a rolling surface of the ball, and is formed to be slightly smaller than the outer rail. And an inner rail having a pair of flange portions bent along the longitudinal direction of the base portion and the base portion and provided with a ball rolling surface, and between the ball rolling surface of the outer rail and the ball rolling surface of the inner rail And a retainer that aligns the plurality of balls at a predetermined interval.

  Such a conventional slide rail unit is used, for example, with the outer rail fixed to the furniture body and the inner rail fixed to both sides of the drawer. In this usage mode, when the drawer to which the inner rail is fixed is pulled into the furniture body, if the force for pulling the drawer is excessive, the drawer may rebound from the furniture body. As a means for preventing the drawer from rebounding, a conventional slide rail unit is formed with a holding mechanism for maintaining the inner rail stored in the outer rail. The holding mechanism is formed by a bounce prevention member provided on the outer rail and a pair of locking recesses provided on the flange portion of the inner rail. In such a conventional slide rail unit, when the inner rail is stored with respect to the outer rail, the locking recess of the inner rail engages with the rebound preventing member due to the elastic deformation of the rebound preventing member. Thereby, the storage state of the inner rail with respect to the outer rail is maintained.

Japanese Utility Model Publication No. 5-13221

  However, in such a conventional slide rail unit, since the member separate from the outer rail and the inner rail is provided when the inner rail holding mechanism is completed, the number of parts in the slide rail unit increases accordingly. As a result, there is a disadvantage that the production cost increases.

  The present invention has been made in view of such problems, and the object thereof is to provide a separate mechanism for manufacturing the inner rail holding mechanism with respect to the outer rail, and to easily and easily form the holding mechanism. Therefore, an object of the present invention is to provide a slide rail unit that can be produced at low cost.

  That is, the present invention provides a first rail member having a base portion and a pair of flange portions bent and raised along the longitudinal direction of the base portion and having a ball rolling surface, and the base portion and the length of the base portion. A second rail member bent and raised along a direction and provided with a ball rolling surface and housed between the pair of flange portions of the first rail member; and the first rail member A plurality of balls rolling while applying a load between the ball rolling surface of the second rail member and the ball rolling surface of the second rail member, and fixed to the tip of the first rail member into which the second rail member is inserted And a rail guide member formed to have a diameter substantially the same as the diameter of the ball and guiding the storage of the second rail member with respect to the first rail member.

  The second rail member is formed with a protrusion formed on the tip edge of the flange portion and protruding on the ball rolling surface, while the rail guide member has the second rail member A notched portion with which the protrusion of the second rail member engages is formed in the state of being accommodated in the first rail member, and the second rail member and the first rail member are base portions of the second rail member. Are assembled to each other via the balls so as to be displaceable in a direction close to the base portion of the first rail member.

  In such a slide rail unit to which the present invention is applied, the protrusion is formed at the leading edge of the flange portion provided on the second rail member, while the second rail member and the first rail member are The base portions of the second rail member are assembled to each other via the balls so as to be displaceable in a direction close to the base portion of the first rail member. For this reason, even if the rail guide member itself is not elastically deformed in the width direction of the first rail member, the first rail member or the second rail member is displaced in the direction in which the base portions of these rail members approach, Interference between the projection and the rail guide member when the second rail member is stored in the first rail member can be prevented, and as a result, the second rail member is easily stored in the first rail member. It becomes possible.

  In other words, according to the slide rail unit to which the present invention is applied, it is necessary to provide another member that can be elastically deformed when providing the holding mechanism for the second rail member with respect to the first rail member, as in the conventional slide rail unit. Instead, the holding mechanism is configured by molding the existing rail guide member and the second rail member. As a result, the number of parts can be reduced, and the production cost of the slide rail unit can be reduced.

It is a front view which shows the slide rail unit to which this invention is applied. It is sectional drawing of the direction perpendicular | vertical to the longitudinal direction of the slide rail unit to which this invention is applied. It is a front view which shows the rail guide member fixed to a 1st rail member. It is a perspective view which shows the rail guide member fixed to the 1st rail member. It is a perspective view which shows the projection part formed in a 2nd rail member. It is a schematic diagram which shows the manufacturing process of the projection part formed in a 2nd rail member. It is a front view which shows the storage mechanism with which a slide rail unit is provided with this invention. It is a front view which shows the storage relationship of a 1st rail member and a 2nd rail member. FIG. 9 is a half cross-sectional view showing a locking relationship between the protruding portion and a rail guide member in a region A shown in FIG. 8. FIG. 9 is a half sectional view showing a fitting relationship between the protruding portion and a rail guide member in a region B shown in FIG. 8.

    Hereinafter, an embodiment of a slide rail unit to which the present invention is applied will be described in detail with reference to the accompanying drawings.

  1 and 2 show an embodiment of a slide rail unit to which the present invention is applied. FIG. 1 is a front view, and FIG. 2 is a cross-sectional view in a direction perpendicular to the longitudinal direction. The slide rail unit is used, for example, for a slide part of a drawer in furniture, and is fixed to the outer rail 1 fixed to the furniture body, the center rail 2 assembled to the outer rail 1 movably, and the drawer. In addition, an inner rail 3 movably accommodated in the center rail 2, a plurality of balls 4 disposed between the outer rail 1 and the center rail 2, and between the center rail 2 and the inner rail 3. And retainers 5a and 5b for arranging these balls 4 at predetermined intervals.

  The outer rail 1 is formed by precision forming a metal plate material (for example, SPCC) by roll forming, and has a base portion 11 and a pair of flange portions 12 bent and raised along the longitudinal direction of the base portion 11. doing. A ball rolling surface 13 having a radius of curvature slightly larger than the radius of curvature of the spherical surface of the ball 4 is formed on the inner side surface of each flange portion 12, and the ball 4 moves on the ball rolling surface 13. It has come to roll.

  Similarly to the outer rail 1, the center rail 2 is precision-formed by roll forming of a metal plate material (for example, SPCC), and a pair of base portions 21 and a pair of the base rails 21 are bent and raised along the longitudinal direction of the base portions 21. A flange portion 22 is provided. The center rail 2 formed in this way is accommodated between a pair of flange portions 12 constituting the outer rail 1, and balls 4 are arranged between the outer rail 1. It is formed small around.

  A ball rolling surface 23 is provided on the outer surface of each flange portion 22 so as to face the ball rolling surface 13 of the outer rail 1 and have a radius of curvature slightly larger than the radius of curvature of the spherical surface of the ball 4. The balls 4 roll between the ball rolling surface 13 of the outer rail 1 and the ball rolling surface 23 of the center rail 2 while applying a load. Further, a ball rolling surface 24 having a radius of curvature slightly larger than the radius of curvature of the spherical surface of the ball 4 is formed on the inner surface of each flange portion 22, and the ball rolling surface 24 is formed by the inner rail. 3 is opposite. Each flange portion 22 of the center rail 2 configured in this way is formed by folding back a metal plate material, and when the flange portion 22 is extended, the ball rolling surface 23 and the ball rolling surface are formed. 24 are formed on the same plane.

  On the other hand, like the outer rail 1, the inner rail 3 is also precisely formed by roll forming processing of a metal plate material (for example, SPCC), and a pair of the base portion 31 and the pair of base members 31 bent and raised along the longitudinal direction. The flange portion 32 is provided. The inner rail 3 is accommodated between the pair of flange portions 22 of the center rail 2 and is formed slightly smaller than the center rail 2. A ball rolling surface 33 facing the ball rolling surface 24 of the center rail 2 is formed on the outer surface of each flange portion 32. The ball rolling surface 33 is also formed with a radius of curvature slightly larger than the radius of curvature of the spherical surface of the ball 4, similar to the ball rolling surfaces 13, 23, and 24. Rolling is performed between the ball rolling surface 33 and the ball rolling surface 24 of the center rail 2 while applying a load.

  The balls 4 arranged between the outer rail 1 and the center rail 2 are arranged at a predetermined interval by a retainer 5a, and the balls 4 arranged between the center rail 2 and the inner rail 3 are arranged at a predetermined interval. Thus, contact between adjacent balls is prevented. These retainers 5a and 5b are formed by pressing a steel plate or injection molding a resin material. As shown in FIG. 2, two rows of ball rows are arranged in each retainer 5a, 5b, but these two rows of ball rows are arranged by separate retainers and can roll independently. It may be configured to be able to.

  In the slide rail unit to which the present invention is applied, the outer rail 1, the center rail 2 and the inner rail 3 are formed to have substantially the same length, and the outer rail 1, the center rail 2 and the inner rail 3 receive a large number of balls 4. Is assembled through. Then, the rolling of the ball 4 allows the center rail 2 to slide by half the total length of the outer rail 1, and the inner rail 3 slides by half the total length of the center rail 2. It is configured to be able to move. As a result, it is possible to obtain a stroke amount for the entire length of the inner rail 3 as a slide rail unit.

  In the following description, for the sake of convenience, one end in the direction in which the rail members 1, 2, and 3 are pulled out is referred to as a front end, and the other end is referred to as a rear end. In the state where the center rail 2 is pulled out from the outer rail 1, as shown in FIG. 1, the front end portion of the outer rail 1 and the rear end portion of the center rail 2 overlap each other, and the front end portion of the outer rail 1 and the rear end portion of the center rail are overlapped. The ball 4 is interposed at a position where and overlap. On the other hand, when the inner rail 3 is pulled out from the center rail 2, the front end portion of the center rail 2 and the rear end portion of the inner rail 3 overlap each other, and the front end portion of the center rail 2 and the rear end of the inner rail 3 are overlapped. The ball 4 is interposed at a position where the portion overlaps.

  As shown in FIG. 1, a protective cap 61 that constitutes a holding mechanism for the inner rail 3 with respect to the center rail 2 is provided at the tip of the center rail 2. 3 and 4 show the protective cap 61. FIG. 3 is a front view showing the protective cap 61 fixed to the tip of the center rail 2. FIG. 4 is a perspective view of the protective cap 61. FIG. is there. This protective cap 61 is formed by injection molding of a resin material, and is fixed to the tip of the center rail 2. In FIG. 3, in order to make the configuration of the protective cap 61 easier to understand, hatching lines are applied to portions of the protective cap 61 that can be observed from the front.

  The protective cap 61 includes a cap portion 63 that engages with the end surface of the front end of the center rail 2, and a pair of rail guide members 64 that are connected to the cap portion 63. That is, the center rail 2 in this embodiment corresponds to the first rail member of the present invention. The cap portion 63 has a pair of flange portions 63a facing the pair of flange portions 22 provided on the center rail 2, and the protective cap 61 is fixed to the tip end portion of the center rail 2. The front end surface of the center rail 2 is formed so as to cover from the longitudinal direction of the center rail 2. Each flange portion 63 a is formed with an inclined surface 63 b that gradually slopes from the longitudinal end portion of the protective cap 61 to the connecting portion with the rail guide member 64. Further, the cap portion 63 has a fixed base portion 63c that contacts the base portion 21 of the center rail 2 facing the outer rail 1 in a state where the protective cap 61 is fixed to the tip end portion of the center rail 2. An attachment boss 63d that fits into the attachment hole 25 for fixing provided in the base portion 21 is provided in the base portion 63c.

  On the other hand, each of the pair of rail guide members 64 is erected from a pair of flange portions 63 a related to the cap portion 63 and is formed in a substantially cylindrical shape. Each rail guide member 64 is formed with a diameter substantially the same as the diameter of the ball 4 rolling while applying a load between the ball rolling surface 24 of the center rail 2 and the ball rolling surface 33 of the inner rail 3. ing. Further, a notch 65 is formed in the longitudinal center of the inward outer peripheral surface 64a of each rail guide member 64. At both ends in the longitudinal direction of the notch portion 65, there are a first step portion 65a provided on the free end side of the rail guide member 64 and a second step portion 65b provided on the connection portion side with the cap portion 63. is doing. And the notch part 65 provided in one rail guide member 64 has mutually opposed the notch part 65 provided in the other rail guide member 64 regarding the longitudinal direction of each rail guide member 64. Furthermore, an inclined surface 64b that is continuous with the inclined surface 63b provided on the flange portion 63a is formed at the connecting portion of each rail guide member 64 with the flange portion 63a.

  As shown in FIG. 3, the protective cap 61 configured in this way is fixed to the tip end portion of the center rail 2 by fitting the mounting boss 63 d into the fixing mounting hole 25 of the center rail 2. . Further, each rail guide member 64 is pressed against the ball rolling surface 24 of the center rail 2 by the fixing member 7. The fixing member 7 is formed by pressing a steel plate and is riveted to the base portion 21 of the center rail 2. The fixing member 7 is configured to fit into a notch 65 formed in each rail guide member 64.

  Here, each rail guide member 64 is formed with a diameter substantially the same as the diameter of the ball 4, and therefore, when the protective cap 61 is attached to the center rail 2, The facing outer peripheral surface 64a coincides with a tangential plane Q including a contact point P between the ball rolling surface 33 of the inner rail 3 and each ball 4 held by the center rail 2.

  According to the configuration of the protective cap 61, in the assembly operation of the slide rail unit of this embodiment, the ball rolling surface 33 of the inner rail 3 is brought into sliding contact with the inward outer peripheral surfaces 64a of the pair of rail guide members 64. However, when the inner rail 3 is inserted into the center rail 2, each ball 4 held by the flange portion 22 of the center rail 2 can be brought into contact with the ball rolling surface 33 of the inner rail 3 at an appropriate position. It becomes. In addition, the ball rolling surface 33 of the inner rail 3 and the ball rolling surface 24 of the center rail 2 can be accurately opposed to each other. That is, in the present invention, the center rail 2 to which the rail guide member 64 is fixed corresponds to the first rail member of the present invention. In FIG. 3, the ball rolling surface 23 provided on the center rail 2 is omitted for easy understanding of the relationship between the rail guide member 64 and the ball rolling surface 24 of the center rail 2.

  5 and 6 show a protrusion 62 that constitutes a holding mechanism for the inner rail 3 in cooperation with a rail guide member 64 that constitutes the protective cap 61. FIG. 5 shows the protrusion 62. FIG. 6 is a schematic view showing a manufacturing process of the protrusion 62. FIG. As shown in FIG. 6, the protrusions 62 are formed by pressing the tip surfaces 32 a of the pair of flange portions 32 provided on the inner rail 3 using a jig J. By this pressing, an indentation of the jig J is formed on the front end surface 32a of the flange portion, while the flange portion 32 is curved toward the outer side in the width direction of the inner rail 3, so that the flange portion 32 is rolled on the ball rolling surface 33 without being rolled toward the inner side in the width direction of the inner rail 3. By this forming process, a protrusion 62 protruding from the ball rolling surface 33 is completed at the leading edge of the flange portion 32 provided on the inner rail 3. Simultaneously with the pressing, inclined surfaces 62a and 62b are formed at both ends in the longitudinal direction of the protruding portion 62, as shown in FIG. 5, which are gradually inclined from the base portion of the protruding portion 62 to the head portion. It is like that. That is, the inner rail 3 on which the protrusion 62 is formed corresponds to the second rail member of the present invention.

  The pair of projecting portions 62 formed in this way is configured such that when the inner rail 3 is completely stored in the center rail 2, the ball rolling surface 24 of the center rail 2 and the ball rolling surface of the inner rail 3 are It is provided in the position where the ball 4 which rolls while applying a load between the running surface 33 is not interposed. Further, the inner rail 3 is completely accommodated with respect to the center rail 2 so as to be fitted into the notch 65 of the rail guide member 64 fixed to the front end of the center rail 2. . In FIG. 5, the protective cap 61 fixed to the front end portion of the center rail 2 is omitted for easy understanding of the configuration of the protruding portion 62.

  On the other hand, FIG. 7 is a front view showing the storage mechanism 8 of the slide rail unit according to the present embodiment. The storage mechanism 8 is provided at the rear end portion of the center rail 2 and is rotatably fixed to the base portion 21 of the center rail 2 facing the outer rail 1 via a support shaft 81a. And a guide projection 82 provided on the base 11 of the outer rail 1 facing the center rail 2.

  The storage mechanism 8 configured as described above is set in a state in which the protrusion 62 formed on the inner rail 3 is fitted in the notch 65 of the rail guide member 64 fixed to the center rail 2. The center rail 2 is configured to be accommodated in the outer rail 1. That is, the outer rail 1 in this embodiment corresponds to the third rail member of the present invention. Since the configuration and operation of the storage mechanism 8 are described in Japanese Patent Application Laid-Open No. 2004-57567, detailed description thereof is omitted.

  A slide rail unit to which the present invention having the above configuration is applied is used, for example, in a slide portion of a drawer in furniture. In such a case, the outer rail 1 is fixed to the furniture body, and the inner rail 3 is fixed to both side surfaces of the drawer. Used. When the drawer to which the inner rail 3 is fixed is stored in the furniture body, the center rail 2 is locked to the outer rail 1 due to the configuration of the storage mechanism 8. The rail 3 is stored.

  FIG. 8 is a front view showing a storage relationship between the center rail 2 and the inner rail 3. When the drawer to which the inner rail 3 is fixed is stored in the furniture body, the inner rail 3 slides in the right direction in FIG. At this time, the pair of projecting portions 62 provided on the inner rail 3 slide along the inclined surface 63b of the cap portion 63 and the inclined surface 64b of the rail guide member 64 constituting the protective cap 61, and thereafter The rail guide member 64 is guided onto the inward outer peripheral surface 64a.

  Here, since each rail guide member 64 is formed with a diameter substantially the same as the diameter of the ball 4, when the protrusion 62 of the inner rail 3 slides in the region A shown in FIG. The portion 62 interferes with the inward outer peripheral surface 64a of each rail guide member 64, which may cause sliding resistance of the inner rail 3 with respect to the center rail 2.

  However, the radius of curvature of the ball rolling surface 24 of the center rail 2 and the ball rolling surface 33 of the inner rail 3 rolls while applying a load between the ball rolling surface 24 and the ball rolling surface 33. The radius of curvature of the spherical surface of the ball 4 is set to be slightly larger, and the center rail 2 and the inner rail 3 are assembled to each other via the ball 4. For this reason, when the inner rail 3 is housed in the center rail 2, the center rail 2 and the inner rail 3 are slightly allowed to move in a direction perpendicular to the width direction of the rail members 2 and 3. The pair of protrusions 62 are not formed in the deep part of the ball rolling surface 33 formed on the flange 32, but are provided at the leading edge of the flange part 32.

  Therefore, when the projection 62 of the inner rail 3 slides in the region A shown in FIG. 8, the rail guide member 64 is arranged in the width direction of the center rail 2 and the inner rail in which the projection 62 is formed. As shown in FIG. 9, the inner rail 3 is perpendicular to the width direction of the inner rail 3 (the left direction in FIG. 9) without elastically deforming the three flange portions 32 in the width direction of the inner rail 3. That is, that is, the base portion 31 of the inner rail 3 can move slightly in the direction approaching the base portion 21 of the center rail 2. Due to the displacement of the inner rail 3, the projecting portion 62 provided on the inner rail 3 enters a recess 67 formed between the cap portion 63 and the rail guide member 64. As a result, it is possible to prevent the protrusion 62 and the rail guide member 64 from interfering with each other, thereby suppressing the occurrence of sliding resistance of the inner rail 3 with respect to the center rail 2.

  Further, when the inner rail 3 is housed in the center rail 2 and the pair of protrusions 62 provided on the inner rail 3 enter the area B shown in FIG. 8, as shown in FIG. The part 62 is fitted in the notch part 65 provided in the pair of rail guide members 64. In this state, even if the inner rail 3 is slid in the longitudinal direction of the center rail 2, the inclined surface 62a related to the protrusion 62 is the first step portion 65a of the notch 65, or the inclined surface 62b is the second. The inner rail 3 is retained in the center rail 2 by being locked to the step portion 65b. 9 and 10, only the protective cap 61 provided with the rail guide member 64 is hatched in order to clarify the relationship between the rail guide member 64 and the inner rail 3.

  When the inner rail 3 is housed in the center rail 2 and the pair of protrusions 62 are fitted in the pair of notches 65 provided on the inward outer peripheral surface 64a, the center rail 3 is moved to the outer rail. 1, the engaging member 81 is not locked to the guide protrusion 82, and as a result, the center rail 2 holding the inner rail 3 is stored in the outer rail 1. That is, the drawer to which the inner rail 3 is fixed is completely accommodated in the furniture body to which the outer rail 1 is fixed.

  On the other hand, when pulling out the drawer from the furniture body, the inclined surface 62b of the protrusion 62 provided in the inner rail 3 is engaged with the second step portion 65b of the notch 65 provided in the rail guide member 64. The inner rail 3 is held by the center rail 2. For this reason, the inner rail 3 is not pulled out from the center rail 2, and only the center rail 2 holding the inner rail 3 is pulled out from the outer rail 1.

  When the center rail 2 is pulled out from the outer rail 1, the drawer to which the inner rail 3 is fixed with a predetermined force against the locking force by the second step portion 65b of the notch 65 is moved to the left in FIG. When pulled out, the locked state between the inclined surface 62b of the protrusion 62 and the second step portion 65b of the notch 65 is released. At this time, since the inclined surface 62b is gradually inclined from the base of the projection 62 to the head, the inner rail 3 can be pulled out from the center rail 2 without any resistance.

  Thereafter, even if the protrusion 62 of the inner rail 3 slides in the region A shown in FIG. 8, the inner rail 3 is slightly allowed to move in the direction perpendicular to the width direction. As a result, the inner rail 3 can be pulled out from the center rail 2 without sliding resistance. Then, the inner rail 3 is pulled out from the center rail 2 while the ball rolling surface 33 of the inner rail 3 is in sliding contact with the inward outer peripheral surface 64 a of the rail guide member 64.

  According to the slide rail unit of the present invention configured as described above, in the conventional slide rail unit, the notch portion 65 is formed with respect to the rail guide member 64 used when the inner rail 3 is inserted into the center rail 2. On the other hand, a protrusion 62 protruding on the ball rolling surface 33 provided on the inner rail 3 is formed on the inner rail 3, and the inner rail with respect to the center rail 2 is formed by the notch 65 and the protrusion 62. 3 holding mechanisms are configured.

  In the slide rail unit to which the present invention is applied, the protrusion 62 is formed at the leading edge of the flange portion 32 provided on the inner rail 3, while the inner rail 3 is the base portion of the inner rail 3. 31 is assembled to the center rail 2 via the balls 4 so as to be able to be displaced in a direction close to the base portion 21 of the center rail 2. For this reason, when the inner rail 3 is stored in the center rail 2, the inner rail 3 is not deformed elastically in the width direction of the center rail 2, but the inner rail 3 is the base portion 31 of the inner rail 3. Is displaced in the direction approaching the base portion 21 of the center rail 2, it is possible to prevent the protrusion 62 and the rail guide member 64 from interfering with each other.

  That is, in the slide rail unit to which the present invention is applied, unlike the conventional slide rail unit, the inner rail holding mechanism is not configured by using a member separate from the center rail and the inner rail. A holding mechanism 6 for the inner rail 3 with respect to the center rail 2 is formed by molding the guide member 64 and the inner rail 3. For this reason, compared with the conventional slide rail unit, the number of parts can be reduced, and the production cost of the slide rail unit can be reduced.

  Further, in the slide rail unit to which the present invention is applied, the protrusion 62 provided on the inner rail 3 is easily formed by pressing the flange portion 32 of the inner rail 3 when configuring the holding mechanism 6. On the other hand, it is only necessary to provide the rail guide member 64 with the notch 65. That is, according to the slide rail unit to which the present invention is applied, the holding mechanism of the inner rail 3 with respect to the center rail 2 can be formed easily and easily, and the production cost of the slide rail unit is also compared with the conventional slide rail unit. Can be lowered.

  Further, in the slide rail unit to which the present invention is applied, the notch portion 65 is provided at the longitudinal center portion of the inward outer peripheral surface 64a of the rail guide member 64, and the notch portion 65 has first ends at both longitudinal ends. A step portion 65a and a second 65b are formed. For this reason, it is assumed that the inner rail 3 is accommodated in the center rail 2, and that the pulling force is further applied to the center rail 2 from the state in which the protrusion 62 provided on the inner rail 3 is fitted in the notch 65. In addition, the inclined surface 62 a of the protrusion 62 is locked to the first step portion 65 a of the notch 65. As a result, it is possible to prevent a collision between the center rail 2 and the inner rail 3 when the inner rail 3 is stored in the center rail 2.

  In the holding mechanism according to the above embodiment, a pair of protrusions 62 are formed on the inner rail 3, while a notch 65 is formed on each rail guide member 64, so that a total of two notches 65 are provided. However, if the storage state of the inner rail 3 with respect to the center rail 2 is maintained, a single protrusion 62 is provided for the inner rail 3 and either one of the two rail guide members 64 is provided. It is also possible to provide a configuration in which the notch 65 is provided in the projection and the protrusion 62 and the notch 65 are fitted to each other.

  Further, in the rail guide member 64 according to the above-described embodiment, the notch 65 is provided in the center in the longitudinal direction of the inward outer peripheral surface 64a, and the first step portion 65a and the second step 65a are provided at both longitudinal ends of the notch 65. Although the step portion 65b is formed, the configuration of the notch portion 65 is not limited to the configuration of the above embodiment. For example, the notch portion 65 is provided at the free end of the rail guide member 64 and the flange portion 22 of the center rail 2 is provided. It may be formed as a stepped portion that is opened toward the ball 4 held by the protrusion 4, and the protruding portion 62 provided on the inner rail 3 may be locked to the stepped portion that becomes the notch. However, from the viewpoint of preventing the inner rail 3 and the center rail 2 from colliding with each other when the inner rail 3 is retracted with respect to the center rail 2, the notch 65 has the longitudinal direction of the inward outer peripheral surface 64a. It is good to have the 1st step part 65a and the 2nd step part 65b in the center part, and the longitudinal direction both ends.

  Furthermore, the protective cap 61 according to the above-described embodiment has a cap portion that engages with the front end surface of the center rail 2 in consideration of the possibility that an operator working with the slide rail unit may be damaged by the front end of the center rail 2. 63, when the inner rail 3 is housed in the center rail 2, the ball rolling surface 33 of the inner rail 3 and the ball 4 held by the center rail 2 are slid in contact with each other at an appropriate position. As long as the inner rail 3 can be guided with respect to the center rail 2, the cap portion 63 may be omitted from the configuration of the protective cap 61.

  Moreover, although the said embodiment applies this invention to the slide rail unit which consists of three rail members of an inner rail, a center rail, and an outer rail, this invention is a slide rail unit which consists of an inner rail and two outer rail rail members, for example. It is applicable to. Also in such a slide rail unit, a rail guide member is usually provided at the front end of the outer rail in order to facilitate the operation of inserting the inner rail into the outer rail.

  For this reason, when applying this invention to the slide rail unit which consists of an inner rail and an outer rail, while forming a notch part with respect to the rail guide member fixed to the front-end | tip part of an outer rail, it is a protrusion part with respect to an inner rail. And an inner rail holding mechanism for the outer rail may be configured. That is, when the present invention is applied to a slide rail unit including an inner rail and an outer rail, the outer rail corresponds to the first rail member of the present invention, and the inner rail corresponds to the second rail member.

  As described above, when the present invention is applied to the slide rail unit including the inner rail and the outer rail, the rail guide in which the protrusion of the inner rail is provided on the outer rail while the inner rail is completely accommodated with respect to the outer rail. When fitted into the notch of the member, the inner rail is held against the outer rail. Thereby, it is possible to prevent the inner rail from rebounding when the inner rail is stored in the outer rail. Furthermore, the same effect as the embodiment in which the present invention is applied to the slide rail unit including the outer rail, the center rail, and the inner rail is exhibited.

  2 ... Center rail (first rail member), 3 ... Inner rail (second rail member), 4 ... Ball, 21, 31 ... Base part, 22, 32 ... Flange part, 23, 24, 33 ... Ball rolling 64, rail guide member, 62 ... projection, 64a ... inward outer peripheral surface (sliding contact surface), 65 ... notch

Claims (4)

A first rail member having a base portion and a pair of flange portions having a ball rolling surface and bent along the longitudinal direction of the base portion, and bent along the longitudinal direction of the base portion and the base portion. A second rail member having a pair of flange portions provided with a ball rolling surface, and housed between the pair of flange portions of the first rail member, and the ball rolling surface of the first rail member; A plurality of balls that roll while applying a load between the ball rolling surfaces of the second rail member, and the second rail member that is fixed to the tip of the first rail member to be inserted and A rail guide member that has a diameter substantially the same as the diameter and guides the storage of the second rail member with respect to the first rail member,
The second rail member is formed with a protrusion formed on the tip edge of the flange portion and protruding on the ball rolling surface,
The rail guide member is formed with a notch that engages with the protrusion of the second rail member in a state where the second rail member is housed in the first rail member.
The second rail member and the first rail member are assembled to each other via the balls so that the base portion of the second rail member can be displaced in a direction close to the base portion of the first rail member. Slide rail unit to be used. The slide rail unit according to claim 1, wherein a pair of stepped portions are provided at both longitudinal ends of the cutout portion provided in the rail guide member. The slide rail unit according to claim 2, wherein a fixing member for fixing the rail guide member to the first rail member is fitted into the cutout portion. In the slide rail unit according to claim 1 to 3,
A third rail member having a base portion and a pair of flange portions bent and raised along a longitudinal direction of the base portion and having a ball rolling surface;
A pair of flange portions included in the first rail member is formed with a rolling surface of a ball facing the rolling surface of the third rail member, and the first rail member is connected to the third rail via a plurality of balls. Stored between a pair of flange portions of the member,
The rear end portion of the first rail member is provided with an accommodation mechanism that allows the first rail member to be accommodated in the third rail member in a state where the second rail member is substantially accommodated in the first rail member. A slide rail unit characterized by

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