Centering device for longitudinal elements and a resetting device for motor vehicles

Adjustment device consisting of a console (2) and a part (1) which can be adjusted between different positions and which is arranged in the console, and a position-retaining device (11) for position retaining of the adjustable part in the chosen position, which comprises a fixed position retaining organ (13) arranged on the console, and exhibiting a concave guiding surface (16), and a mobile position-retaining organ (12) attached to the adjustable part, or conversely with the mobile position-retaining organ (12) exhibiting a pin (14) which is spring biased for contact against the concave guiding surface and arranged to, when overcoming a certain adjustment force of the adjustable part, depart from said contact position, characterized in that the pin (14) is arranged in at least one casing (18), and together with the casing is positioned in a cavity (20) in a holder (15) which is fixedly attached to the adjustable part, with a pin head (23) protruding out of an opening (24) in a front end of both the casing and the holder, and in that the holder (15) exhibits a seat (38) with a guiding surface for a peripheral conical portion (36) of the casing, and in that the casing is spring biased in the axial direction so that the conical portion strives to be in contact with the seat of the holder in and for centering of the casing and the pin relative to the longitudinal axis (21) of the holder.