Patent ID: 7506856

Claim:
A seat slide device comprising: a lower rail having a channel structure; an upper rail having a channel structure, the upper rail being slidably engaged with the lower rail in a manner to define an elongate enclosed space therebetween; and a lock mechanism including: a lock arm disposed on the upper rail to be pivotable around a pivotal center axis which is approximately in parallel to an elongate direction of the upper rail, wherein the lock arm has a pair of arm portions, at least two lock pawls formed on the lock arm along the elongate direction of the upper rail, a plurality of lock holes formed on the lower rail and the upper rail, the lock pawls being insertable through the lock holes to lock the upper rail with respect to the lower rail, a pair of slits formed at predetermined front-and-rear positions of a side surface of the upper rail and formed to bridge from a top wall portion of the upper rail to an upper side wall portion of the upper rail, and a bearing bracket configured to pivotably support the lock arm, wherein the bearing bracket and the lock arm are disposed within the enclosed space between the upper rail and the lower rail, wherein the bearing bracket includes a pair of bearing portions configured to pivotably support both ends of the pair of arm portions of the lock arm via a pair of pivotal axles on the pair of bearing portions, wherein the pair of bearing portions and both ends of the pair of arm portions of the lock arm are insertable into the pair of slits in a direction from an inner side of the upper rail to an external side of the upper rail with both ends of the pair of arm portions of the lock arm pivotally supported on the pair of bearing portions of the bearing bracket, and wherein both ends of the pair of arm portions of the lock arm and the pair of bearing portions are disposed within inner spaces defined by the pair of slits.