Abstract: The protective structure comprises a at least in one direction curved support rib structure of a material or a material composition that is suited for injection molding, which support rib structure is formed of an outer frame and of inner frames fitted into the interior space of the outer frame and being fixed to each other and/or to the outer frame. The material thickness of the support rib structure varies in a direction perpendicular to a surface formed by the support rib structure so that the material thickness is greater at the middle of the support rib structure compared to the material thickness at the edges of the support rib structure.
Abstract: The protective structure comprises a at least in one direction curved support rib structure of a material or a material composition that is suited for injection molding, which support rib structure is formed of an outer frame and of inner frames fitted into the interior space of the outer frame and being fixed to each other and/or to the outer frame. The material thickness of the support rib structure varies in a direction perpendicular to a surface formed by the support rib structure so that the material thickness is greater at the middle of the support rib structure compared to the material thickness at the edges of the support rib structure.