Abstract: A child's tiltable car seat comprises a base intended to be attached to a vehicle seat having a part of a curved slide mounted thereon and a tiltable structure having the other part of the curved slide attached thereto and cooperating with the base part of the curved slide. The base part of the curved slide has a C-shaped cross section, while the part of the curved slide attached to the tiltable structure has an .OMEGA.-shaped cross section. The flanges of the .OMEGA.-shaped part are able to slide inside grooves delimited by the C-shaped part thus providing a stable assembly.

Abstract: A seat body comprised of a shell is articulated on a base adapted for attachment to a passenger vehicle seat. The base has a wall with a circular opening within which an upper plate and a lower plate are attached to form a swivel assembly. The swivel assembly includes a hub that rests against the edge of the wall delimiting the opening, and two flanges resting respectively above and below the wall. A spring biased lever is provided to lock the swivel assembly rotationally relative to the base.