Patent ID: 7017993

Claim:
A seat device, comprising a seatback, in combination with a lower rail and an upper rail, the seat device having a lock/unlock mechanism for releasing a locking condition between the lower rail and the upper rail by turning down the seatback in a forward direction and allowing said upper rail to slide on said lower rail, the seat device comprising: a turning bracket of said lock/unlock mechanism rotatably supported on a lower arm fixed to said upper rail to rotate about an axis, said turning bracket being always fixed against sliding movement relative to the upper rail; an actuating lever rotatable about said axis to rotate upon rotation of the turning bracket; a lock segment inserted into opening portions of both rails to effect the locking condition, the lock segment being movable to a position releasing the locking condition in accordance with movement of said actuating lever, wherein said seatback turning down in said forward direction causes to turn said turning bracket and said actuating lever in one direction and release a locking condition of said both rails; and a hook member pivotally supported by said lower arm and having a projecting portion capable of engaging with or disengaging from a notch portion of said turning bracket, wherein said lower rail and upper rail are maintained to be released when said projecting portion is engaged with said notch portion.