Structure for a vehicle seat element, and a method of making such a structure

The present invention relates to a rigid structure made of composite-material for a vehicle seat element, and to methods of making such structures. A rigid structure for a vehicle seat element, the structure being formed as a single piece made of a composite material comprising a thermoplastic matrix and reinforcing fibers forming at least firstly first and second rigid sideplates each extending between a first end and a second end, and secondly a rigid horizontal cross-member secured to the second ends of the sideplates. The structure has at least one hinge comprising a first fixing portion overmolded by the first end of the first sideplate.