Seat adjustment device, and to methods of operating such

Seat adjusting device (10) and method of operating such, with two relative to each other and / or with respect to a mounting surface (12, 14) arranged to move the seat parts (15, 16, 17, 18, 19) via at least one ratchet mechanism (56) with each other are connected, wherein the ratchet mechanism (56) comprises a double-acting rotary drive (54) and the rotary drive (54) by means of a connecting element (52, 64, 72, 78) with at least one pneumatic linear actuator (52) is operatively connected, which when acted with a pressure (42, 43) contracts axially and thereby the rotary drive (54) to rotate.