Patent ID: 8668180

Claim:
A seat slide device comprising: a lower rail fixed to a floor; an upper rail fixed to a seat and supported to be movable with respect to the lower rail; a plurality of lock portions formed in the lower rail and arranged in a movement direction of the upper rail; a lock member attached to the upper rail, wherein the seat slide device is switchable between a locked state, in which the lock member is engaged with the lock portions to restrict movement of the upper rail with respect to the lower rail, and an unlocked state, in which the lock member is separated from the lock portions to permit the movement of the upper rail with respect to the lower rail; a movable portion selectively approaching and separating from a top plate portion of the lower rail; and an interlocking mechanism for transmitting movement of the lock member as movement of the movable portion, the interlocking mechanism includes: a slider connected to the upper rail so that the slider reciprocates in a longitudinal direction of the upper rail, the movable portion being provided in the slider; and a guide formed in the upper rail, the guide causing the movable portion to separate from the top plate portion or approach the top plate portion through movement of the slider, wherein the interlocking mechanism moves by transmitting movement of the lock member as the movement of the slider drives the movable portion along edges of said guide, and wherein in the unlocked state, the movable portion becomes separated from the top plate portion, in the locked state, the movable portion approaches the top plate portion to decrease a gap between the movable portion and top plate portion compared to the gap in the unlocked state.