JP2001180338A - Seat slide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength of a long lower rail, ensure a bolting space at the bottom of the long lower rail, and bolt the long lower rail to a floor through an opening in the long lower rail. SOLUTION: A long lower rail 12 has a roller receiving step portion 12f formed on each side of the bottom of a body portion 12a. An upper rail 13 includes a body portion 13a and a vertical wall 13e projecting from the middle of an upper wall 13d upward beyond an opening 12e. A roller 27 is inserted between the bottom step portions 12f of the body portion 12a of the long lower rail 12, and the upper wall 13d of the body portion 13a of the upper rail 13. The roller 27 has opposite side portions 27a having a larger diameter than a middle portion 27b. Both side portions 27a of the roller 27 are placed on the bottom step portions 12f of the body portion 12a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat slide device, and more specifically, to a long lower rail that is long mounted in the front-rear direction of a sheet mounting floor, and a longitudinal direction on the long lower rail. The present invention relates to a seat slide device comprising an upper rail slidably guided and supported on a seat body side.

[0002]

2. Description of the Related Art Generally, a vehicle seat is provided with a seat cushion and a seat main body comprising a seat back and the like provided upright and rotatably adjustable behind the seat cushion. By supporting the vehicle body on the floor via a front-rear slide mechanism, the vehicle is configured to be able to slide and adjust in the front-rear direction of the vehicle body, so that the layout of seats in the vehicle interior can be variously changed.

[0003] As such a seat forward / backward slide mechanism, a long seat longitudinally formed on the vehicle body floor side, mounted on the vehicle body floor side, and provided at substantially the same height as the surface of the floor carpet. A seat slide device including a lower rail and an upper rail attached and fixed to the seat body side is used.

As shown in FIG. 3, in the conventional ordinary seat slide device 1, a pair of left and right lower rails 2 are formed of a metal plate and have a substantially upward U-shaped main body 2a.
And a pair of right and left locking portions 3 which are bent inward from the front end sides of both side portions 2b of the main body portion 2a and are suspended downward, and an opening is formed at an end portion of the locking portion 3. ing. Also,
The front and rear ends of the lower rail 2 are fixed on the vehicle body floor via the front and rear legs 4a and 4b.

[0005] A pair of left and right upper rails 5 of the seat slide device 1 are formed in a substantially inverted T-shape so as to be mounted on the lower rail 2 so as to be covered with the lower rail 2, and from the front end side of a horizontal portion 5 a of the upper rail 5. Both sides 5 bent upward
The locked portion 7 is formed by b. This locked part 7
Are combined so as to be engageable with the locking portion 3 on the lower rail 2 side. An anchor member, a shaft of a seat lifter, a base of a reclining mechanism, and the like are attached to a substantially inverted T-shaped vertical portion 5c of the upper rail 5. A roller 9 a is inserted between the lower rail 2 and the upper rail 5, and a ball 9 b is inserted between the locking portion 3 and the locked portion 7.

When the roller 9a and the ball 9b are interposed between the lower rail 2 and the upper rail 5 so as to be slidably supported, a sliding function is obtained by the conventional simple sliding between metal surfaces. It can prevent problems such as a sudden increase or decrease in slide resistance and a malfunction during operation due to abnormal noise or fluctuations in slide resistance due to load. is there.

[0007]

However, when the conventional seat slide apparatus 1 as described above is formed long, there is also a problem that the processing of each part is complicated, and there is a backlash due to a dimensional error of each part. In addition, when the lower rail 2 is placed on the floor side of the vehicle body, dust on the floor surface passes through the opening of the lower rail 2 when the lower rail 2 is placed on the floor side of the vehicle body. There is a possibility that the upper rail 5 may fall into the lower rail 2 and a smooth sliding operation of the upper rail 5 may not be obtained. In addition, it is impossible to obtain a simple and inexpensive configuration that appropriately supports the weight of the occupant and the like.

An object of the present invention is to improve the strength of the long lower rail, prevent deformation of the upper rail, form the opening of the long lower rail narrow, and remove dust on the floor surface from the lower rail. Can be prevented from falling into the inside of the lower rail from the opening of the long lower rail, can be bolted to the floor of the long lower rail from the narrow opening of the long lower rail, and if garbage falls inside the lower rail There is no risk of hindering the rotation of the roller, and when a peeling load is applied, it can exhibit the primary function of preventing peeling. Moreover, the structure is simple, and there is no need to increase the number of new parts or to install additional parts, and it is cost effective. Inexpensive, easy and quick installation work, smooth and stable sliding operation can be achieved, and friction resistance is reduced to improve operability. There is provided a seat slide device capable of and.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a seat slide device according to a first aspect of the present invention is provided such that the sheet slide device is long in the front-rear direction of a sheet mounting floor surface. A long lower rail, and an upper rail that is guided and supported slidably in the longitudinal direction on the long lower rail and is attached and fixed to the seat body side, wherein the long lower rail is substantially upward. A main body having a U-shape, and a pair of left and right upper parts extending inward from both ends of the main body and forming an opening, and a roller receiving part on both sides of a bottom part of the main body. A step portion is formed, a slider receiving portion is formed at both ends of the main body portion, and the upper rail is a book having a substantially downward U-shape so as to be mounted on the long lower rail. And a vertical wall protruding above the center of the upper wall of the main body and protruding above the opening in the upper part of the long lower rail. A part is formed.

According to a second aspect of the present invention, there is provided a seat slide device, comprising: a long lower rail which is long mounted in the front-rear direction of a sheet mounting floor; and a slidable longitudinal direction on the long lower rail. In a seat slide device comprising an upper rail which is guided and supported and is attached to and fixed to a seat body side, the long lower rail has a body part having a substantially upward U-shape; A pair of left and right upper portions extending to form an opening, a roller receiving step is formed on both sides of the bottom of the main body, and a slider receiving portion is formed at both ends of the main body, The upper rail has a substantially U-shaped main body portion which is mounted on the long lower rail so as to be covered with the long lower rail, and protrudes upward from a center of an upper wall of the main body portion. A vertical wall protruding above the opening at the upper part of the rail, a slider receiving part formed at the upper end of both sides of the main part of the upper rail, and a slider receiving part of the long lower rail and a slider receiving part of the upper rail. A slider is inserted between the upper and lower parts, and a roller is inserted between a step at the bottom of the main body of the long lower rail and an upper wall of the main body of the upper rail,
Both sides of the roller are formed to have a larger diameter than the center, and both sides of the roller are mounted on a step at the bottom of the main body of the long lower rail.

According to a third aspect of the present invention, there is provided a seat slide device, comprising: a long lower rail which is long mounted in the front-rear direction of a sheet mounting floor; and a slidable longitudinal direction on the long lower rail. In a seat slide device comprising an upper rail which is guided and supported and is attached to and fixed to a seat body side, the long lower rail has a body part having a substantially upward U-shape; A pair of left and right upper portions extending to form an opening, a roller receiving step is formed on both sides of the bottom of the main body, and a slider receiving portion is formed at both ends of the main body, The upper rail has a substantially U-shaped main body portion which is mounted on the long lower rail so as to be covered with the long lower rail, and protrudes upward from a center of an upper wall of the main body portion. A vertical wall protruding above the opening at the upper part of the rail, a slider receiving part formed at the upper end of both sides of the main part of the upper rail, and a slider receiving part of the long lower rail and a slider receiving part of the upper rail. A slider is inserted between the upper and lower parts, and a roller is inserted between a step at the bottom of the main body of the long lower rail and an upper wall of the main body of the upper rail,
Both sides of the roller are formed with a larger diameter than the center, and both sides of the roller are placed on the step at the bottom of the main body of the long lower rail, and the center of the small diameter and the long lower are The long lower rail is bolted to the floor in a space formed between the rail and the bottom of the main body.

According to a fourth aspect of the present invention, there is provided a seat slide device comprising: a long lower rail which is mounted long in the front-rear direction of a sheet mounting floor; and a slidable longitudinal direction on the long lower rail. In a seat slide device comprising an upper rail which is guided and supported and is attached to and fixed to a seat body side, the long lower rail has a body part having a substantially upward U-shape; A pair of left and right upper portions extending to form an opening, a roller receiving step is formed on both sides of the bottom of the main body, and a slider receiving portion is formed at both ends of the main body, The upper rail has a substantially U-shaped main body portion which is mounted on the long lower rail so as to be covered with the long lower rail, and protrudes upward from a center of an upper wall of the main body portion. A vertical wall protruding above the opening at the upper part of the rail, a slider receiving part formed at the upper end of both sides of the main part of the upper rail, and a slider receiving part of the long lower rail and a slider receiving part of the upper rail. A slider is inserted between the upper and lower parts, and a roller is inserted between a step at the bottom of the main body of the long lower rail and an upper wall of the main body of the upper rail,
Both sides of the roller are provided in contact with or near both sides of the main body of the upper rail.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A seat slide device according to the present invention will be described below in detail with reference to the drawings. 1 and 2 show an embodiment of the present invention, respectively. FIG. 1 shows a cross-sectional shape of a slide rail mechanism part which is a main part of the present invention, and FIG. 2 shows an exploded perspective view. ing. Although not shown, the seat slide device 11 is provided on the floor of the vehicle body between the seat body constituted by a seat cushion, a seat back and the like and the floor surface of the vehicle body. It is well-known that it is used to support the slidable direction.

The sheet slide device 11 is a long lower rail 12 that is placed long in the front-rear direction of the sheet mounting floor.
And an upper rail 13 which is guided and supported slidably in the longitudinal direction on the long lower rail 12 and is attached and fixed to the seat body side. The seat slide device 11 is formed by extrusion molding from a light alloy such as an aluminum die cast or a magnesium alloy.
In addition, a hard synthetic resin molded product may be used. Although the long lower rail 12 is buried in the cutout portion 14a of the carpet 14 in the embodiment shown in FIG. 1, a leg may be provided and used as a normal seat slide device.

The long lower rail 12 has a main body portion 12a having a substantially upward U-shape, slider receiving portions 12c, 12c formed inside the outer ends of both sides 12b, 12b of the main body portion 12a, and Both sides 12b, 1
The opening 12 is bent inward from the tip side of 2b and extended.
e, a pair of left and right upper portions 12d, 12d. Roller receiving step portions 12f, 12f are formed on both sides of a bottom portion of the main body portion 12a.

The upper rail 13 has a substantially downwardly U-shaped main body portion 13a which can be mounted on the long lower rail 12 so as to be covered with the lower lower rail 12, and both side portions 13a of the main body portion 13a.
slider receiving portion 1 formed on the upper outside of b, 13b
3c, 13c and upper walls 13d, 13d of the main body 13a
Of the long lower rail 12
The upper part 12d has a vertical wall 13e protruding above the opening 12e of the upper part 12d. A latch 32 as a lock mechanism and an interlock member 33 are provided between the upper rail 13 and the long lower rail 12.

As shown in FIG. 1, a first hook portion 15 is formed at an end of the main body portion 12a of the long lower rail 12 on the side of the opening 12e, and both side portions 12a of the main body portion 12a are formed.
Second hook portions 17, 17 are formed on b, 12b, respectively. In addition, the upper ends of both sides 12b, 12b of the upper part of the long lower rail 12 and a pair of left and right upper parts 12d,
The finisher mounting portions 21 and 21 are provided near the connection portion with the 12d.
Are formed projecting obliquely upward, and finishers 23, 23 are attached to the finisher attaching portion 21, as shown in FIG.

The finisher 23 is formed of a synthetic resin material, has a soft lip portion 23a formed on the inside, and a locking portion 23b formed on the back side of the finisher 23. The locking portion 23b is attached to the finisher mounting portion 21. By being locked, the lip 23a comes into contact with the vertical wall 13e protruding above the opening 12e, and the opening 12e of the upper portions 12d, 12d of the long lower rail 12 is shielded. . End caps 23c and 23d are attached to the front and rear ends of the finisher 23.

As shown in FIG. 1, the upper rail 13
First locking portions 18, 18 which are locked to the first hook portions 15, 15 of the long lower rail 12, respectively, are formed on upper walls 13d, 13d of the main body portion 13a, and the main body portion of the upper rail 13 is formed. The second hook portions 17, 1 of the long lower rail 12 are provided at the tip sides of both side portions 13 b, 13 b of the long lower rail 12.
The second locking portions 19, 19 locked to the lock 7 are formed respectively.

A slider 25 is inserted between the slider receiving portions 12c, 12c of the long lower rail 12 and the slider receiving portions 13c, 13c of the upper rail 13. This slider 25 is the upper rail 13
Because it is located at the upper end of both sides 13b, 13b of the main body 13a, the frictional resistance in the vertical and horizontal directions can be reduced. A roller 27 is inserted between the steps 12f, 12f at the bottom of the main body 12a of the long lower rail 12 and the upper walls 13d, 13d of the main body 13a of the upper rail 13. Reference numeral 27c is a roller shaft.

The roller 27 has two side portions 27a, 27a.
Are formed with a larger diameter than the central portion 27b, and both side portions 27a of the roller are mounted on the upper end of a vertical wall forming steps 12f, 12f at the bottom of the main body portion 12a of the long lower rail 12. Thereby, a wide space can be secured between the small-diameter central portion 27b and the bottom of the main body 12a of the long lower rail 12, and the strength is improved by forming the steps 12f, 12f at the bottom. be able to. Further, when the long lower rail 12 is fixed to the floor surface with the bolt 31, there is no fear that the head 31a of the bolt 31 abuts on the roller 27 because there is a wide space.

The upper part 12 of the long lower rail 12
The head 31 of the bolt 31 is provided on the opening 12e side of the d and 12d.
Each of the arc-shaped notches 12g through which a can be inserted is formed, so that the bolts 31 of the long lower rail 12 can be easily fixed.

Also, both side portions 27a of the roller 27, 27a
Of the main body 13a of the upper rail 13 are slidably abutted or provided on both sides 13b, 13b. When the vertical wall 13e of the upper rail 13 receives a tensile load upward, it is possible to prevent the side portions 13b, 13b of the main body portion 13a of the upper rail 13 from bending inward.

According to such a configuration, even if a peeling load acts on the long lower rail 12 and the upper rail 13 from above and below, the first rails 12 and 13 provided between the two rails 12 and 13 can be used.
Hook portions 15 and 15 and first locking portions 18 and 18 are locked, and second hook portions 17 and 17 and second locking portions 1 are locked.
9 and 19 are locked, so that a peeling prevention function can be obtained temporarily, so that peeling can be easily and reliably obtained in a required state even when a peeling load is greatly applied.

The present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part of the seat slide device can be freely modified and changed as needed. Various modifications may be considered, including the shape and material of the rail.

[0026]

The above is an embodiment of the seat slide device according to the present invention.
The long lower rail includes a main body having a substantially upward U-shape, and a pair of left and right upper parts extending inward from both ends of the main body and forming an opening, and a bottom part of the main body. Roller receiving step portions are formed on both sides of the main body portion, and slider receiving portions are formed at both ends of the main body portion, and the upper rail is substantially downward U-shaped so as to be covered with the long lower rail and assembled. And a vertical wall protruding above a center of an upper wall of the main body and protruding above an opening at an upper portion of the long lower rail, and both side portions of the main body of the upper rail. Since the slider receiving part is formed at the upper end, the opening of the long lower rail is formed narrow, and dust on the floor surface can be prevented from falling into the lower rail from the opening of the lower rail. The long lower rail can be bolted to the floor from the narrow opening of the lower rail, and even if dirt falls inside the lower rail, a roller receiving step is formed, so dust can be collected at the bottom of the step. It can be stored, and when a peeling load is applied, it can temporarily exhibit the peeling prevention function, and it has a simple structure, does not require an increase in the number of new parts or additional work, and is inexpensive. It is possible to obtain a seat slide device that can perform the mounting operation easily and quickly, can obtain a smooth and stable sliding operation, and can reduce frictional resistance and improve operability.

According to the seat slide device of the second aspect of the present invention, the long lower rail has a main body having a substantially upward U-shape, and extends inward from both ends of the main body. And a pair of left and right upper portions forming an opening, a roller receiving step is formed on both sides of the bottom of the main body, a slider receiving portion is formed at both ends of the main body, and the upper is formed. The rail has a substantially downward U-shaped main body that is mounted on the long lower rail so as to be mounted thereon, and an upper portion of the main wall protrudes upward from the center of the upper wall. A vertical wall protruding above the upper portion, a slider receiving portion formed at upper ends of both sides of the main body portion of the upper rail, and a slider receiving portion of the long lower rail and a slider receiving portion of the upper rail. Slider is inserted between the roller is inserted between the upper wall of the body portion of the stepped portion and the upper rail of the bottom of the body portion of the long lower rail,
Since both sides of the roller are formed with a larger diameter than the center, and both sides of the roller are placed on the step at the bottom of the body of the long lower rail, the body of the long lower rail is When the long lower rail is bolted to the floor, there is no danger that the head of the bolt will contact the bottom of the upper rail, and debris will fall into the lower rail. Even if it does, since the roller receiving step is formed, dust can be stored in the lower part of the step, and when a peeling load is applied, it can temporarily exhibit the peeling prevention function, and the structure is simple. It is possible to obtain a seat slide device that can perform the mounting operation easily and quickly, can obtain a smooth and stable sliding operation, and can reduce frictional resistance and improve operability.

Further, according to the seat slide device of the third aspect of the present invention, the long lower rail has a main body having a substantially upward U-shape, and extends inward from both ends of the main body. And a pair of left and right upper portions forming an opening, a roller receiving step is formed on both sides of the bottom of the main body, a slider receiving portion is formed at both ends of the main body, and the upper is formed. The rail has a substantially downward U-shaped main body that is mounted on the long lower rail so as to be mounted thereon, and an upper portion of the main wall protrudes upward from the center of the upper wall. A vertical wall protruding above the upper portion, a slider receiving portion formed at upper ends of both sides of the main body portion of the upper rail, and a slider receiving portion of the long lower rail and a slider receiving portion of the upper rail. Slider is inserted between the roller is inserted between the upper wall of the body portion of the stepped portion and the upper rail of the bottom of the body portion of the long lower rail,
Both sides of the roller are formed with a larger diameter than the center, and both sides of the roller are placed on the step at the bottom of the main body of the long lower rail, and the center of the small diameter and the long lower are Since the long lower rail is bolted to the floor in the space formed between the bottom of the main body of the rail and the bottom, the strength of the bottom of the main body of the long lower rail can be improved, and the long lower rail can be used. When bolted to the floor, there is no danger that the head of the bolt will contact the bottom of the upper rail, and even if dust falls into the lower rail, a roller receiving step is formed. The garbage can be stored in the lower part of the unit, the structure is simple, the number of new parts is not increased or additional work is not required, the cost is low, the installation work can be performed simply and quickly, and it is smooth. It is possible to obtain a stable sliding operation can be natural also get seat slide device capable of improving the operability with less frictional resistance.

According to the seat sliding device of the fourth aspect of the present invention, the long lower rail has a substantially upwardly U-shaped main body, and extends inward from both ends of the main body. And a pair of left and right upper portions forming an opening, a roller receiving step is formed on both sides of the bottom of the main body, a slider receiving portion is formed at both ends of the main body, and the upper is formed. The rail has a substantially downward U-shaped main body that is mounted on the long lower rail so as to be mounted thereon, and an upper portion of the main wall protrudes upward from the center of the upper wall. A vertical wall protruding above the upper portion, a slider receiving portion formed at upper ends of both sides of the main body portion of the upper rail, and a slider receiving portion of the long lower rail and a slider receiving portion of the upper rail. Slider is inserted between the roller is inserted between the upper wall of the body portion of the stepped portion and the upper rail of the bottom of the body portion of the long lower rail,
Since both side portions of the roller are provided in contact with or near both side portions of the main body of the upper rail, the strength of the bottom of the main body of the long lower rail can be improved, and the long lower rail can be placed on the floor. When bolted to the surface, there is no danger that the head of the bolt will come into contact with the bottom of the upper rail, and when a peeling load is applied, deformation of the upper rail can be prevented. Formed narrowly, it can prevent dust on the floor from falling into the lower rail through the lower rail opening, and can be bolted to the floor of the long lower rail from the narrow opening of the long lower rail. Also, even if dust falls into the lower rail, the roller receiving step is formed, so dust can be stored at the bottom of the step, Duck structure is simple, requires no increase or attached work of new parts, is less expensive in terms of cost,
It is possible to obtain a seat slide device that can perform the mounting operation easily and quickly, can obtain a smooth and stable sliding operation, and can reduce frictional resistance and improve operability.

According to the present invention, the strength of the long lower rail can be improved, the upper rail can be prevented from being deformed, the opening of the long lower rail is formed narrow, and dust on the floor surface can be reduced. Can be prevented from falling into the inside of the lower rail from the opening of the long lower rail, can be bolted to the floor of the long lower rail from the narrow opening of the long lower rail, and if garbage falls inside the lower rail There is no risk of hindering the rotation of the roller, and when a peeling load is applied, it can exhibit the primary function of preventing peeling. Moreover, the structure is simple, and there is no need to increase the number of new parts or to install additional parts, and it is cost effective. Inexpensive, easy and quick installation work, smooth and stable sliding operation can be achieved, and friction resistance is reduced to improve operability. It can be obtained seat slide device capable of and.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing an embodiment of a seat slide device according to the present invention.

FIG. 2 is an exploded perspective view of the seat slide device according to the present invention.

FIG. 3 is a schematic sectional view of a conventional seat slide device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Seat slide device 12 Long lower rail 12a Main part 12b Both sides 12c Slider receiving part 12d Upper part 12e Opening 12f Roller receiving step 12g Notch 13 Upper rail 13a Main part 13b Both sides 13c Slider receiving part 13d Upper wall 13e Vertical wall 15 First hook portion 17 Second hook portion 18 First locking portion 19 Second locking portion 21 Finisher mounting portion 23 Finisher 23a Lip portion 23b Locking portion 23c End cap 23d End cap 25 Slider 27 Roller 27a Both sides 27b Central part 31 Bolt 31a Head 32 Latch 33 Interlock member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mori Sachi Eguchi 771 Kozono, Ayase-shi, Kanagawa F-term in Ikeda Bussan Co., Ltd. 3B087 BA02 BB03 BB06 BB08

Claims (4)

[Claims] 1. A long lower rail which is mounted long in the front-rear direction of a sheet mounting floor surface, is guided and supported slidably in the longitudinal direction on the long lower rail, and is attached and fixed to a seat body side. In the seat slide device comprising an upper rail, the long lower rail includes a main body having a substantially upward U-shape, and a pair of left and right sides extending inward from both ends of the main body and forming an opening. An upper portion, a roller receiving step portion is formed on both sides of a bottom portion of the main body portion, a slider receiving portion is formed at both ends of the main body portion, and the upper rail is covered with the long lower rail. A main body having a substantially downward U-shape that can be assembled as above, protruding above the center of the upper wall of the main body, and protruding above the opening at the upper part of the long lower rail. Has a straight wall, a seat slide apparatus characterized by slider receiving portions on both sides the upper end of the body portion of the upper rail are formed. 2. A long lower rail which is long mounted in the front-rear direction of a sheet mounting floor surface, is guided and supported slidably in the longitudinal direction on the long lower rail, and is mounted and fixed to the seat body side. In the seat slide device comprising an upper rail, the long lower rail includes a main body having a substantially upward U-shape, and a pair of left and right sides extending inward from both ends of the main body and forming an opening. An upper portion, a roller receiving step portion is formed on both sides of a bottom portion of the main body portion, a slider receiving portion is formed at both ends of the main body portion, and the upper rail is covered with the long lower rail. A main body having a substantially downward U-shape that can be assembled as above, protruding above the center of the upper wall of the main body, and protruding above the opening at the upper part of the long lower rail. A slider receiving portion is formed at the upper end of both sides of the main body portion of the upper rail, and a slider is inserted between the slider receiving portion of the long lower rail and the slider receiving portion of the upper rail. A roller is inserted between the step at the bottom of the body of the lower rail and the upper wall of the body of the upper rail, and both sides of the roller are formed with a larger diameter than the center, and both sides of the roller are formed. A seat slide device, wherein the portion is mounted on a step at the bottom of the main body of the long lower rail. 3. A long lower rail which is long mounted in the front-rear direction of the sheet mounting floor surface, is guided and supported slidably in the longitudinal direction on the long lower rail, and is attached and fixed to the seat body side. In the seat slide device comprising an upper rail, the long lower rail includes a main body having a substantially upward U-shape, and a pair of left and right sides extending inward from both ends of the main body and forming an opening. An upper portion, a roller receiving step portion is formed on both sides of a bottom portion of the main body portion, a slider receiving portion is formed at both ends of the main body portion, and the upper rail is covered with the long lower rail. A main body having a substantially downward U-shape that can be assembled as above, protruding above the center of the upper wall of the main body, and protruding above the opening at the upper part of the long lower rail. A slider receiving portion is formed at the upper end of both sides of the main body portion of the upper rail, and a slider is inserted between the slider receiving portion of the long lower rail and the slider receiving portion of the upper rail. A roller is inserted between the step at the bottom of the body of the lower rail and the upper wall of the body of the upper rail, and both sides of the roller are formed with a larger diameter than the center, and both sides of the roller are formed. Part is placed on the step at the bottom of the main body of the long lower rail, and the long lower rail is attached to the floor surface in the space formed between the center of the small diameter and the bottom of the main body of the long lower rail. A seat slide device which is bolted. 4. A long lower rail which is long mounted in the front-rear direction of the sheet mounting floor surface, is guided and supported slidably in the longitudinal direction on the long lower rail, and is attached and fixed to the seat body side. In the seat slide device comprising an upper rail, the long lower rail includes a main body having a substantially upward U-shape, and a pair of left and right sides extending inward from both ends of the main body and forming an opening. An upper portion, a roller receiving step portion is formed on both sides of a bottom portion of the main body portion, a slider receiving portion is formed at both ends of the main body portion, and the upper rail is covered with the long lower rail. A main body having a substantially downward U-shape that can be assembled as above, protruding above the center of the upper wall of the main body, and protruding above the opening at the upper part of the long lower rail. A slider receiving portion is formed at the upper end of both sides of the main body portion of the upper rail, and a slider is inserted between the slider receiving portion of the long lower rail and the slider receiving portion of the upper rail. A roller is inserted between a step at the bottom of the main body of the lower rail and an upper wall of the main body of the upper rail, and both sides of the roller abut or come into contact with both sides of the main body of the upper rail. A seat slide device, which is provided.