JP2005153696A - Seat sliding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve sliding performance and abrasion resistance by improving lubrication in a slider part, in regard to a seat sliding device provided with a resin slider. <P>SOLUTION: In this seat sliding device, the resin slider 6 is fitted for arrangement in a part wherein wall surfaces 2a and 2b of a lower rail 2 and wall surfaces 3a and 3b of an upper rail 3 face to each other in the condition wherein the slider 6 is supported by the upper rail 3. The slider 6 is provided with a grease gathering part and an elastic deforming buffer part. With such a structure, sliding performance between the lower rail 2 and the upper rail 3 can be excellently maintained by the grease gathering in the grease gathering part. The buffer part of the slider 6 can excellently maintain sliding performance of the seal sliding device. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seat slide device, and more particularly to a slide structure of a slide rail.

  The seat slide device is usually configured to include a lower rail fixedly arranged on the floor surface side and an upper rail that is inserted into the lower rail so as to be relatively displaceable in the axial direction and to which a seat is attached. In order to make the relative sliding with the upper rail smooth, a roller and a ball are respectively arranged between the two, and the load in the vertical direction is supported by the roller, and the load in the horizontal direction and the diagonal direction is supported by the ball. It was common (refer patent document 1).

  However, in the structure in which the roller and the ball are respectively disposed between the lower rail and the upper rail in this way, the lower rail, the upper rail, and the roller and the ball are all made of metal. Further, there is a problem that the upper rail and the roller and the ball are in metal contact and a contact noise is generated.

  In view of such a problem, from the viewpoint of reducing as much as possible the generation of contact sound associated with the sliding of the slide rail, there is a technique for substituting one or both of the roller and the ball with a resin slider. It has been proposed (see, for example, Patent Document 2 and Patent Document 3).

(Japanese Patent Laid-Open No. 11-170895 (paragraphs “0013” to [0020], FIGS. 3 to 5)

JP-A-5-254364 (paragraphs “0003” to [0005], FIG. 1) Japanese Patent Laid-Open No. 10-315810 (paragraphs “0008” to [0014], FIG. 3 and FIG. 4).

  However, in the conventional seat slide device provided with such a resin slider, sufficient consideration has not been given to the lubricity such as the application of grease, so that the sliding property of the slide rail is deteriorated due to the breakage of the grease. In addition, the durability of the slider decreases and the backlash between the lower rail and the upper rail becomes excessive. As a result, the slide performance as the seat slide device is deteriorated and the operation fee is reduced. There was a problem that the ring deteriorated and the commercial value of the seat slide device was lowered.

  Therefore, in the present invention, in the seat slide device provided with the resin slider, the main purpose is to improve the slidability and wear resistance by making the slider portion have good lubricity. .

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

  In the first invention of the present application, a seat slide device comprising a lower rail 2 fixedly arranged on the floor surface side, and an upper rail 3 fitted into the lower rail 2 so as to be relatively displaceable in the axial direction and to which a seat is attached. The resin slider 6 is fitted and arranged in a state where the wall surfaces 2a, 2b of the lower rail 2 and the wall surfaces 3a, 3b of the upper rail 3 face each other while being supported on the upper rail 3 side. 6 is characterized in that storage portions 64, 69 for storing grease and buffer portions 63, 67, 68 capable of elastic deformation in the thickness direction are provided.

  The second invention of the present application is characterized in that, in the seat slide device according to the first invention, the buffer parts 63, 67, and 68 are configured by elastically deformable cavities.

  According to a third invention of the present application, in the seat slide device according to the first invention, the storage portions 64 and 69 are configured by concave portions 64 and 69 that open to face the wall surfaces 2a and 2b of the lower rail 2. It is a feature.

  According to a fourth invention of the present application, in the seat slide device according to the first, second or third invention, the slider 6 includes a side wall 2a extending in the vertical direction of the lower rail 2 and the upper rail 3 facing each other. It is characterized by having a flat plate shape having a substantially flat plate-like main body portion 61 fitted between the side walls 3a extending in the vertical direction.

  According to a fifth invention of the present application, in the seat slide device according to the first, second or third invention, the slider 6 includes a side wall 2a extending in the vertical direction of the lower rail 2 and the upper rail 3 which are opposed to each other. A substantially flat main body 61 fitted between the side walls 3a extending in the vertical direction of the main body 61, and an upper extension 66 facing the upper wall 3c of the upper rail 3 continuously from the upper end of the main body 61. The main body portion 61 has a substantially U-shaped cross section formed by a lower extending portion 65 that is continuous with the lower end of the main body portion 61 and faces the bottom wall 3a of the upper rail 3.

  In the present invention, the following effects can be obtained.

  (A) According to the seat slide device according to the first invention of the present application, the resin slider 6 is placed on the upper rail where the wall surfaces 2a, 2b of the lower rail 2 and the wall surfaces 3a, 3b of the upper rail 3 face each other. The slider 6 is fitted and arranged in a state of being supported on the side 3, and the slider 6 is provided with storage portions 64 and 69 for storing grease and buffer portions 63, 67 and 68 that can be elastically deformed in the thickness direction. Therefore, the lubricity between the slider 6 and the wall surfaces 2a and 2b of the lower rail 2 facing and relatively sliding with the grease stored in the storage portions 64 and 69 is maintained well over a long period of time. The sliding performance between the lower rail 2 and the upper rail 3 is maintained at a high level.

  Further, since the sliders 6, 67, and 68 are provided in the slider 6, for example, there is dimensional variation due to production errors between the lower rail 2 and the upper rail 3 of the slide rail 1. In this case, the buffer portions 63, 67 and 68 are elastically deformed in the thickness direction, so that the variation in dimensions is absorbed as much as possible, and the sliding performance of the seat slide device is maintained well.

  As a synergistic effect, the slide performance and operation feeling of the seat slide device are improved, and as a result, the commercial value of the seat slide device can be expected to be improved.

  Further, the slider 6 is configured to be fitted and disposed at a portion where the wall surfaces 2a and 2b of the lower rail 2 of the slide rail 1 and the wall surfaces 3a and 3b of the upper rail 3 face each other, and the slider 6 is adopted. At this time, since it is not necessary to change the shape of the slide rail or the like, the molding process of the lower rail 2 and the upper rail 3 of the slide rail 1 is not increased, and the seat slide device including the slider 6 is included. Therefore, the manufacturing cost can be kept low, which can contribute to the cost reduction of the seat slide device.

  (B) According to the seat slide device according to the second invention of the present application, in addition to the effect described in the above (a), the following specific effect is obtained. That is, in the present invention, the buffer parts 63, 67, 68 are formed of elastically deformable cavities, so that the buffer parts 63, 67, 68 in the case where the slider 6 is integrally formed of a resin material. Manufacture is easy, and the cost reduction of the slider 6 is promoted accordingly.

  (C) According to the seat slide device according to the third invention of the present application, in addition to the effect described in the above (a), the following specific effect can be obtained. That is, in the present invention, since the storage portions 64 and 69 are constituted by the concave portions 64 and 69 that open to the wall surfaces 2a and 2b of the lower rail 2, the slider 6 is integrally formed with a resin material. The manufacture of the recesses 64 and 69 is easy, and the cost reduction of the slider 6 is promoted accordingly.

  (D) According to the seat slide device according to the fourth invention of the present application, in addition to the effect described in the above (a), (b) or (c), the following specific effect can be obtained. In other words, in the present invention, the slider 6 is mounted on the substantially flat plate-like body portion fitted between the side wall 2a extending in the vertical direction of the lower rail 2 and the side wall 3a extending in the vertical direction of the upper rail 3 facing each other. Since the slider 6 is in the form of a flat plate, it is easy to form the slider 6 integrally with a resin material, so that the cost of the slider 6 can be reduced, and the sheet is provided with the slider 6. Cost reduction of the slide device is promoted.

  (E) According to the seat slide device according to the fourth invention of the present application, in addition to the effect described in the above (a), (b) or (c), the following specific effect can be obtained. In other words, in the present invention, the slider 6 is mounted on the substantially flat plate-like body portion fitted between the side wall 2a extending in the vertical direction of the lower rail 2 and the side wall 3a extending in the vertical direction of the upper rail 3 facing each other. 61, an upper extending portion 66 that is continuous with the upper end of the main body 61 and faces the upper wall 3c of the upper rail 3, and a bottom wall 3a of the upper rail 3 that is continuous with the lower end of the main body 61. Since it has a substantially U-shaped cross section composed of the opposed lower extending portions 65, the body portion 61 can support a lateral load acting between the lower rail 2 and the upper rail 3, and the slider 6 Since the lower extending portion 65 and the upper extending portion 66 can support the vertical load acting between the lower rail 2 and the upper rail 3, it is used in a conventional seat slide device. Both the roller and the ball that have been removed can be eliminated, and the sliding property between the lower rail 2 and the upper rail 3 can be ensured only by the slider 6, and as a result, the number of parts and the number of assembly steps can be reduced. A slide device can be provided at a lower cost.

  Hereinafter, the present invention will be specifically described based on preferred embodiments.

A: First Embodiment FIGS. 1 to 3 show a seat slide device Z1 according to a first embodiment of the present invention. The seat slide device Z1 is fixedly arranged on the vehicle body floor surface side, and is fitted and arranged so as to be slidable relative to the lower rail 2, and a seat (not shown) is attached to the upper side thereof. The upper rail 3 is provided.

  As shown in FIG. 3, the lower rail 2 includes a bottom wall 2a, a pair of left and right side walls 2b that rises continuously from the left and right edges of the bottom wall 2a, and an upper end of the side wall 2b. It has a pair of left and right ceiling walls 2c extending inward, has a substantially C-shaped cross section with a groove 21 between the pair of ceiling walls 2c, and faces the pair of ceiling walls 2c upward. It is fixed to the floor of the vehicle body in a different posture.

  As shown in FIG. 3, the upper rail 3 has a substantially inverted T-shaped cross-section formed by abutting and joining plate materials having a substantially L-shaped cross-sectional shape in a back-to-back state. 3b, a pair of left and right side walls 3b that rises continuously from the left and right edges of the side wall 3b, and a vertical wall 3c that rises upward from the center in the width direction of the bottom wall 3a and is fixed to the seat side. Composed.

  As shown in FIGS. 1 to 3, the lower rail 2 and the upper rail 3 are arranged such that the side wall 3b of the upper rail 3 is placed in a space surrounded by the bottom wall 2a, the side wall 2b, and the top wall 2c of the lower rail 2. It is assembled in the state of entering. In order to smoothly and stably move the lower rail 2 and the upper rail 3 relative to each other, the following first rollers 4 and 5 and a slider 6 are provided.

  The first rollers 4 are respectively supported at both ends of a support shaft 8 fixed to the lower end portion of the vertical wall 3 of the upper rail 3, and are slidably contacted on the bottom wall 2a of the lower rail 2, It supports a downward load applied to the upper rail 3 and is disposed at both front and rear ends of the upper rail 3.

  The second rollers 5 are respectively supported at both ends of a support shaft 8 fixed to the lower end portion of the vertical wall 3 of the upper rail 3, close to the top wall 2 c of the lower rail 2, and at the bottom of the lower rail 2. It is spaced apart from the wall 2a. When an upward load is applied to the upper rail 3 and the upper rail 3 is lifted, it comes into contact with the top wall 2c of the lower rail 2 and prevents further lifting. Therefore, the upper rail 3 is disposed at a substantially central portion in the axial direction.

  The slider 6 is disposed between the side wall 2b of the lower rail 2 and the side wall 3b of the upper rail 3 that face each other in the width direction of the slide rail 1, and supports the load in the horizontal direction applied to the upper rail 3 to support the load. The distance between the lower rail 2 and the upper rail 3 is always kept at a constant value, and is arranged at an intermediate position between the first roller 4 and the second roller 5 in the upper rail 3.

  The slider 6 is integrally formed of a resin material and has a predetermined thickness (specifically, the side wall 2b of the lower rail 2 and the side wall 3b of the upper rail 3 as shown in FIGS. 4 to 6). A main body portion 61 having a strip plate shape having a dimension substantially matching the interval between the main body portion 61 and the back surface 61a side of the main body portion 61 with a predetermined interval in the longitudinal direction of the main body portion 61. The two locking projections 62 are formed.

  The main body portion 61 has a long hole-like cross-sectional shape, and a cushion hole 63 (corresponding to a “buffer portion” in the claims) penetrating the main body portion 61 in the height direction (short side direction). A plurality (5 in this embodiment) are provided at predetermined intervals in the length direction (long side direction). Therefore, the main body 61 can be appropriately elastically deformed in the thickness direction at a portion corresponding to the cushion hole 63.

  In addition, a recess 64 that is recessed into the inner side of the cushion hole 63 and extends in the height direction is formed at a position corresponding to the cushion hole 63 on the surface 61 b of the main body 61. The recess 64 corresponds to a “reservoir” in the claims, and is filled with grease as described later. The slider 6 is fixedly supported on the side wall 3b by engaging the locking projection 62 from the outer surface side of the side wall 3b into the locking hole 31 provided on the side wall 3b of the upper rail 3. The

  The upper rail 3 is fitted to the lower rail 2 side with the first roller 4 and the second roller 5 attached to the lower end of the vertical wall 3c and the slider 6 attached to the side wall 3b. It is. When the upper rail 3 is fitted into the lower rail 2, the first roller 4 contacts the bottom wall 2 a of the lower rail 2, and the second roller 5 approaches the top wall 2 c of the lower rail 2. While facing each other, the surface 61 b of each slider 6 is close to or in contact with the side wall 2 b of the lower rail 2.

  In this inserted state, grease is applied to the inner side of the lower rail 2, and the lubricity of each of the rollers 4, 5 and the slider 6 is ensured by the grease. In this case, since the slider 6 is made of a resin material, ensuring the lubricity reduces the slidability between the lower rail 2 and the upper rail 3 and the wear of the slider 6. This is extremely important in terms of enhancing the durability and suppressing the play between the lower rail 2 and the upper rail 3 to maintain the operational feeling.

  In this case, in the slider 6 of this embodiment, since the concave portion 64 is provided on the surface 61 b side of the main body portion 61, grease is stored in the concave portion 64. For this reason, when the surface 61 b of the main body 61 of the slider 6 slides on the side wall 2 b of the lower rail 2 and the slide operation of the slide rail 1 is performed, the grease in the recess 64 is removed from the recess 64. This gradually leaks and enters between the surface 61b and the side wall 3b of the lower rail 2, whereby the slidability between the two is maintained well over a long period of time, and as a result, the wear of the slider 6 is reduced. As a result, the durability of the seat slide device Z1 is suppressed, and rattling between the lower rail 2 and the upper rail 3 is suppressed, and an improvement in the operation feeling of the seat slide device Z1 can be expected.

  In addition, since the slider 6 is provided with the cushion hole 63, for example, when there is a dimensional variation due to a production error between the lower rail 2 and the upper rail 3 of the slide rail 1, The cushion hole 63 is elastically deformed in the thickness direction, so that the dimensional variation is absorbed as much as possible. As a result, the sliding performance of the seat slide device Z1 is favorably maintained.

B: Second Embodiment FIGS. 7 to 9 show a seat slide device Z2 according to a second embodiment of the present invention. This seat slide device Z2 is fixedly arranged on the vehicle body floor surface side, is fitted and arranged so as to be slidable relative to the lower rail 2, and a seat (not shown) is attached to the upper side thereof. The upper rail 3 is provided.

  As shown in FIG. 9, the lower rail 2 has a bottom wall 2a, a pair of left and right side walls 2b that rises continuously from the left and right edges of the bottom wall 2a, and an upper end of the side wall 2b. It has a pair of left and right ceiling walls 2c extending inward, has a substantially C-shaped cross section with a groove 21 between the pair of ceiling walls 2c, and faces the pair of ceiling walls 2c upward. It is fixed to the floor of the vehicle body in a different posture.

  As shown in FIG. 9, the upper rail 3 has a substantially inverted T-shaped cross-sectional shape obtained by abutting and joining plate materials having a substantially L-shaped cross-sectional shape in a back-to-back state. 3b, a pair of left and right side walls 3b that rises continuously from the left and right edges of the side wall 3b, and a vertical wall 3c that rises upward from the center in the width direction of the bottom wall 3a and is fixed to the seat side. Composed.

  As shown in FIGS. 7 to 9, the lower rail 2 and the upper rail 3 are arranged such that the side wall 3b of the upper rail 3 is placed in a space surrounded by the bottom wall 2a, the side wall 2b, and the top wall 2c of the lower rail 2. It is assembled in the state of entering. In order to smoothly and stably move the lower rail 2 and the upper rail 3 relative to each other, the following slider 6 is provided.

  The slider 6 is integrally formed of a resin material. As shown in FIGS. 10 to 12, the slider 6 has a substantially U-shape having a main body 61, a lower extension 65, and an upper extension 66. While having a cross-sectional shape, the main body 61 is provided with a locking projection 62.

  The main body 61 has a strip-like shape having a predetermined thickness (specifically, a dimension that substantially matches the distance between the side wall 2b of the lower rail 2 and the side wall 3b of the upper rail 3). The main body portion 61 has a long hole-like cross-sectional shape and passes through the main body portion 61 in the height direction (short side direction) and corresponds to a cushion hole 63 (corresponding to a “buffer portion” in the claims). ) Are provided at a predetermined interval in the length direction (long side direction) (five in this embodiment). Therefore, the main body 61 can be appropriately elastically deformed in the thickness direction at a portion corresponding to the cushion hole 63.

  In addition, a recess 64 that is recessed into the inner side of the cushion hole 63 and extends in the height direction is formed at a position corresponding to the cushion hole 63 on the surface 61 b of the main body 61. The recess 64 corresponds to a “reservoir” in the claims, and is filled with grease as described later. Further, on the back surface 61 a of the main body 61, locking protrusions 62 inserted and locked into the locking holes 31 provided in the side wall 3 b of the upper rail 3 are provided at predetermined intervals in the longitudinal direction of the main body 61. It is formed integrally with the main body 61.

The lower extending portion 65 protrudes from the locking projection 62 continuously to a portion of the lower end edge of the main body portion 61 that is closer to one side in the thickness direction (specifically, the protruding side portion of the locking projection 62). The plate-like body extends to the side, and recessed cushion holes 67 and 68 are formed on both edges of the lower surface thereof and open to the lower surface, and the lower extending portion 65 is formed in the thickness direction. A concave portion 69 (corresponding to a “reservoir” in the claims) is formed.
The upper extending portion 66 is a plate-like body that extends continuously to one side in the thickness direction of the upper end edge of the main body portion 61 and extends toward the protruding side of the locking projection 62, and is It faces the side extending portion 65 substantially in parallel.

  As shown in FIG. 9, the slider 6 configured as described above is arranged so as to surround the bottom wall 3 a and the side wall 3 b of the upper rail 3 from the outside thereof. That is, the main body 61 faces the side wall 3b, the lower extension 65 faces the bottom wall 3a, and the upper extension 66 faces the upper end of the side wall 3b. In this state, the locking protrusion 62 provided on the main body 61 side is inserted and locked into the locking hole 31 on the upper rail 3 side, thereby being fixed to the upper rail 3 side. As shown in FIGS. 7 and 8, the slider 6 is provided at each of the left and right side walls 3b of the upper rail 3 at two positions in the front and rear directions with a predetermined interval in the rail axis direction.

  The upper rail 3 to which the slider 6 is attached in this manner is inserted and inserted into the lower rail 2 from one end side in the axial direction. In this inserted state, as shown in FIG. The surface 61b of the main body 61 of the slider 6 faces the side wall 2b of the lower rail 2 in the proximity or contact state, and the lower extension 65 has the lower surface abutted against the bottom wall 2a of the lower rail 2. Furthermore, the upper extending portion 66 is opposed to the top wall 2c of the lower rail 2 in the proximity or contact state.

  And in this insertion state, grease is apply | coated to the inner side of the said lower rail 2, and the lubricity of each said slider 6 part is ensured with this grease. In this case, since the slider 6 is made of a resin material, ensuring the lubricity reduces the slidability between the lower rail 2 and the upper rail 3 and the wear of the slider 6. This is extremely important in terms of enhancing the durability and suppressing the play between the lower rail 2 and the upper rail 3 to maintain the operational feeling.

  In the slider 6 of this embodiment, since the concave portion 64 is provided on the surface 61 b side of the main body portion 61, grease is stored in the concave portion 64. For this reason, when the surface 61 b of the main body 61 of the slider 6 slides on the side wall 2 b of the lower rail 2 and the slide operation of the slide rail 1 is performed, the grease in the recess 64 is removed from the recess 64. It gradually leaks and enters between the surface 61b and the side wall 3b of the lower rail 2, whereby the slidability between the two is maintained well over a long period of time.

  Similarly, since the concave portion 69 is provided in the lower extending portion 65, grease is stored in the concave portion 69. Therefore, when the lower extending portion 65 slides on the bottom wall 2a of the lower rail 2 and the slide rail 1 is slid, grease in the recess 69 gradually leaks from the recess 69. This enters between the lower surface of the lower extending portion 65 and the bottom wall 2a of the lower rail 2, so that the slidability between them is well maintained over a long period of time.

  As a result, the wear of the slider 6 is reduced and the durability thereof is increased, and rattling between the lower rail 2 and the upper rail 3 is suppressed, and the operational feeling of the seat slide device Z2 can be expected to be improved. become.

  Further, in this case, the upper extending portion 66 of the slider 6 is interposed between the upper end of the side wall 3b of the upper rail 3 and the top wall 2c of the lower rail 2 opposed thereto, so that the upper The upward load applied to the rail 3 is supported by the upper extending portion 66 coming into contact with the top wall 2c of the lower rail 2, and the backlash in the vertical direction of the upper rail 3 with respect to the lower rail 2 is further reliably suppressed. The

  Further, since the cushion hole 63 is provided in the main body portion 61 of the slider 6 and the cushion holes 67 and 68 are provided in the lower extension portion 65, respectively, for example, the lower rail of the slide rail 1 is provided. 2 and the upper rail 3, when there are variations in dimensions in the vertical and horizontal directions due to production errors, the cushion holes 63, 67, 68 are elastically deformed in the thickness direction so that the above dimensions are obtained. The upper variation is absorbed as much as possible, and as a result, the sliding performance of the seat slide device Z2 is maintained well.

  On the other hand, in the seat slide device Z2, the slider 6 is formed in a substantially U-shape including the main body 61, the lower extending portion 65, and the upper extending portion 66. A horizontal load acting between the upper rails 3 is supported, and a vertical load acting between the lower rail 2 and the upper rail 3 is supported by the lower extending portion 65 and the upper extending portion 66. Therefore, both the roller and the ball used in the conventional seat slide device can be eliminated, and the slidability between the lower rail 2 and the upper rail 3 can be ensured only by the slider 6. As a result, the seat slide device Z2 can be provided at a lower cost by reducing the number of parts and the number of assembly steps.

1 is a side view of a seat slide device according to a first embodiment of the present invention. It is an II-II arrow line view of FIG. It is III-III expanded sectional drawing of FIG. It is a side view of the slider shown in FIG. It is a VV arrow line view of FIG. It is VI-VI sectional drawing of FIG. It is a side view of the seat slide apparatus which concerns on 2nd Embodiment of this invention. It is a VIII-VIII arrow line view of FIG. It is IX-IX expanded sectional drawing of FIG. It is a side view of the slider shown in FIG. It is a XI-XI arrow line view of FIG. It is XII-XII sectional drawing of FIG.

Explanation of symbols

1 .. Slide rail 2 .. Lower rail 3 .. Upper rail 4 .. First roller 5 .. Second roller 6 .. Slider 7 .. Lock hole 21 .. Groove 31 .. Locking hole 61. 62 .. Locking projection 63 .. Cushion hole 64 .. Recess 65.. Lower extension part 66 .. Upper extension part 67 .. Cushion hole 68 .. Cushion hole 69.

Claims (5)

A seat slide device comprising: a lower rail (2) fixedly arranged on the floor surface side; and an upper rail (3) to be fitted in the lower rail (2) so as to be relatively displaceable in the axial direction and to which a seat is attached. And
A resin slider (6) is supported on the upper rail (3) side at a portion where the wall surface (2a, 2b) of the lower rail (2) and the wall surface (3a, 3b) of the upper rail (3) face each other. And placed in a state,
The slider (6) is provided with a storage portion (64, 69) for storing grease and a buffer portion (63, 67, 68) that is elastically deformable in the thickness direction. apparatus. In claim 1,
The seat slide device, wherein the buffer portion (63, 67, 68) is an elastically deformable cavity. In claim 1,
The seat slide device according to claim 1, wherein the storage portion (64, 69) is a recess (64, 69) that opens to face the wall surface (2a, 2b) of the lower rail (2). In claim 1, 2 or 3,
The substantially flat plate in which the slider (6) is fitted between a side wall (2a) extending in the vertical direction of the lower rail (2) facing each other and a side wall (3a) extending in the vertical direction of the upper rail (3). A sheet slide device having a flat plate-like shape having a main body portion (61). In claim 1, 2 or 3,
The substantially flat plate in which the slider (6) is fitted between a side wall (2a) extending in the vertical direction of the lower rail (2) facing each other and a side wall (3a) extending in the vertical direction of the upper rail (3). Main body (61), an upper extending portion (66) that is continuous with the upper end of the main body (61) and faces the upper wall (3c) of the upper rail (3), and the main body (61 ), And a lower extending portion (65) facing the bottom wall (3a) of the upper rail (3) and having a substantially U-shaped cross section.

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