Ikeda Bussan Co. Ltd.

Teruaki Inoue

Tohru Isomura

Masao Sebata

A seat slide device comprises a rail unit consisting of upper and lower guide rails and rollers disposed between the upper and lower guide rails. The upper guide rail includes a substantially channeled member consisting of a downwardly-opening, channeled portion, a vertical portion extending vertically and longitudinally from an upper wall of the downwardly-opening, channeled portion, and flanged portions formed at lower ends of both side walls of the downwardly-opening, channeled portion. The flanged portions of the upper guide rail are slidably engaged with the respective flanged portions of the lower guide rail when assembling. The vertical portion, the downwardly-opening, channeled portion, and the flanged portions of the upper guide rail are integrally formed by bending a piece of metal sheet. The vertical portion is formed by doubling over the metal sheet at an essentially center of the metal sheet. By caulking a flanged portion formed on one vertical wall section of the vertical portion doubled by burring or hole-flanging onto the perimeter of a circular hole formed on the other vertical wall section of the vertical portion doubled by punching, the opposing wall sections of the vertical portion are firmly secured to each other.

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Fujisawa, Japan

Teruaki Inoue