Abstract: The invention relates to the upholstery of a seat element for a motor vehicle and to the method of creating it, in which method a foam support block is produced to fit a frame element; a cover element is created by cold-forming a foam sprayed onto a polypropylene substrate and attached on the reverse side of a textile material in the form of a skin or synthetic material to define the visible shape of the seat element; and the cover element is attached to the support block.

Abstract: An adjustment mechanism comprising a pivoting transmission member which surrounds an inlet member having three outwardly-directed projections. Between the inlet member and the bearing surface there are placed three springs urging wedging bodies towards the projections of the inlet member, and three fixed fingers. One of the fingers is of width sufficient to come into contact with the corresponding wedging bodies to prevent these bodies from wedging against the corresponding projections when the inlet member is in its rest position, while the other two fingers are of width that is small enough for the corresponding wedging bodies to then wedge against the corresponding projections.