Seat adjusting mechanism

Claim 1

In an adjustable vehicle seat; a seat frame; a seat cushion having a forward portion and a rear portion; means mounting said seat cushion for movement, relative to said seat frame, between a first position in which said rear portion of the seat cushion is at substantially the same elevation as said forward portion and a second position in which said rear portion is higher than said forward portion; a cam member; means pivotally mounting said cam member on said seat frame for movement of the cam member, about a pivotal axis, between an operative position for maintaining the seat cushion in its second position and an inoperative position in which the seat cushion is in its first position; means, responsive to a seat occupant leaning forward and lifting the rear portion of said seat cushion, for moving said cam member from its inoperative to its operative position; the center of gravity of said cam member being located forwardly of its pivotal axis when the cam member is in its operative position, to urge the cam member toward its inoperative position; and means on said cam member for engaging the bottom of said seat cushion rearwardly of the front portion thereof, when the cam member is in its operative position, so that the vector force of the weight of said seat cushion is directed downwardly upon said cam member, and no further forwardly than through said pivotal axis of the cam member, to maintain said cam member in said operative position, against the urging of its center of gravity, when the cam member is in said engagement with said seat cushion.