Abstract: The present invention relates to an adjusting device for vehicle seats having a threaded spindle (4) and a spindle nut arranged thereon, each of which is connected in an axially immovable manner with one or the other of elements (1, 2) to be adjusted relative to each other. The spindle nut (13) is provided with a full-length (or continuous) channel (20) running parallel to the threaded bore which receives the threaded spindle (4), which channel receives a bar (22) which prevents a rotation of the spindle nut (13) about the longitudinal axis of its threaded bore. The opposing boundary surfaces (21) of the channel (20), which cooperate with the bar (22) are spaced from each other such that at the midpoint of the channel (20) the space is equal to the bar thickness and uniformly increases toward the two ends of the channel.

Abstract: A seat, particularly a power vehicle seat, has seat rail elements arranged at both longitudinal sides and forming a connection between a vehicle body and the seat part, each of the seat rail elements has a guide rail and a movable rail displaceably longitudinally relative to the guide rail, each of the movable rails includes a carrying member and a holding member together forming a T-shaped movable rail, a hinge connected with the seat part and connecting the movable rail with the back part, the hinge includes two hinge parts formed as a position adjusting and fixing transmission, wherein one of the hinge parts is fixedly connected with the carrying member of the T-shaped movable rail, whereas the other hinge part is connected with the back part and surrounded by the holding member of the T-shaped movable rail.