Vehicle seat having a height- and length-adjustable seat part

Claim 1

A vehicle seat including a backrest and a seat part which is formed by a cushion secured to a first rigid armature, the first armature being itself supported by a second rigid armature on which the backrest is mounted, means for causing the first armature to be moved back and forth with respect to the second armature in a direction termed the longitudinal in order to vary the length of the seat part, and the second armature being supported by a raising mechanism for moving the seat part up and down, wherein the raising mechanism includes at least one rigid raising connecting piece which can be moved in terms of pivoting in a vertical plane parallel to the aforementioned longitudinal direction when the raising mechanism is actuated, this raising connecting piece including a portion, hereinafter termed the driving portion, which undergoes a backward relative movement with respect to the second armature when the raising mechanism moves the seat part up and which undergoes a forward relative movement with respect to the second armature when the raising mechanism moves the seat part down, and wherein the driving portion of the raising connecting piece is coupled to the first armature by a mechanical link in order to move said first armature backward relative to the second armature when the raising mechanism moves the seat part up, and to move the first armature forward relative to the second armature when the raising mechanism moves the seat part down.