Vehicle seat slide device

1. A seat slide device comprising:

a first rail adapted to be fixed to one of a vehicle floor and a vehicle seat, the first rail including a wall portion having a pair of insertion holes arranged in a widthwise direction of the first rail;

a second rail adapted to be fixed to the other one of the vehicle floor and the vehicle seat, wherein the second rail is assembled to the first rail so as to be movable relative to the first rail, and cooperates with the first rail to form an inner space;

a first stopper having an attachment portion and a pair of movement limiting portions, the attachment portion contacting an outer surface of the wall portion of the first rail to be attached to the wall portion, the movement limiting portions being formed integrally with the attachment portion and extending from side edges of the attachment portion through the insertion holes to be located in the inner space; and

a second stopper provided on the second rail,

wherein the movement limiting portions are arranged to be contactable with the second stopper in a direction of relative movement between the first rail and the second rail, wherein, by being engaged with the second stopper, the movement limiting portions limit a relative movement range of the first and second rails.

2. The seat slide device according to claim 1 , wherein the wall portion of the first rail has an inner surface located in the inner space, and wherein the movement limiting portions are structured so as to contact the inner surface of the wall portion on a side opposite to the second stopper in the direction of the relative movement between the first and second rails.

3. The seat slide device according to claim 1 , wherein the movement limiting portions include a pair of plate-like flanges, each of which is passed through one of the insertion holes and extends along the direction of the relative movement between the first and second rails.

4. The seat slide device according to claim 3 , wherein the attachment portion is formed like a plate and has the side edges in a direction intersecting the direction of the relative movement between the first and second rails, and wherein each flange is bent in relation to the attachment portion so as to extend from the corresponding side edge of the attachment portion and to be passed through the corresponding insertion hole.

5. The seat slide device according to claim 3 , wherein the attachment portion includes an extended piece that extends toward the second stopper beyond a contact position at which the flanges contact the second stopper.

6. The seat slide device according to claim 5 , wherein the attachment portion is fastened at the extended piece to the wall portion of the first rail by means of a fastening member.

7. The seat slide device according to claim 1 , wherein the movement limiting portions are structured to contact an existing portion provided on the first rail at a side opposite to the second stopper in the direction of the relative movement between the first and second rails.

8. The seat slide device according to claim 1 , wherein the attachment portion is formed like a plate and has the side edges in a direction perpendicular to the direction of the relative movement between the first and second rails,

wherein the movement limiting portions include a pair of plate-like flanges extending along the direction of the relative movement between the first and second rails, each flange being bent in relation to the attachment portion so as to extend from the corresponding side edge of the attachment portion and to be passed through the corresponding insertion hole, and

wherein the attachment portion includes a pair of extended pieces extending from opposite sides in the direction of the relative movement between the first and second rails and beyond the flanges, the extended pieces contacting the outer surface of the wall portion of the first rail.

9. The seat slide device according to claim 8 , wherein the attachment portion is fastened at the extended pieces to the wall portion of the first rail by means of fastening members, and wherein the attachment portion is fitted to the wall portion of the first rail by means of a projection/recess fitting structure between the extended pieces.

10. The seat slide device according to claim 8 , wherein the attachment portion is fastened at a portion between the extended pieces to the wall portion of the first rail by means of a fastening member, and wherein the attachment portion is fitted to the wall portion of the first rail by means of a projection/recess fitting structure at each of the extended pieces.

11. The seat slide device according to claim 9 , wherein the projection/recess fitting structure includes a recess formed in the wall portion of the first rail and a projection formed on the attachment portion to be fitted in the recess.

12. The seat slide device according to claim 10 , wherein the projection/recess fitting structure includes a recess formed in the wall portion of the first rail and a projection formed on the attachment portion to be fitted in the recess.