Patent ID: 7393055

Claim:
A vehicle seat, comprising: a seat part mounted on a seat frame, said seat frame having front and rear edges and being movable between an initial rear position and an end forward position relative to a vehicle travel direction; a floor structure; front and rear pairs of support legs pivotally coupled to said seat frame adjacent said front and rear edges, respectively, and to said floor structure; and an actuating mechanism connected to one pair of said front and rear pairs of said support legs by a differential mechanism converting pivoting of said one pair into a change of effective lengths of said support legs of said one pair determining vertical distances between said seat frame and said floor structure, said differential mechanism matching said effective lengths of said support legs of said one pair to effective lengths of the other pair of said support legs, said effective lengths of said other pair of said support legs being changeable upon movement of said seat frame, said differential mechanism having a mechanical bell crank lever for each of said support legs of said one pair, each said bell crank lever having a first arm articulated to an end of the respective support leg adjacent said floor structure and a second arm articulated to said floor structure; whereby, all adjustment motion of said seat frame between said rear position and said forward position occurs without tilting of said seat frame relative to said floor structure.