Abstract: The invention relates to a safety helmet having an injected thermoplastics shell, and the method for manufacturing the same. The helmet shell is of composite structure and includes a rigid insert of reinforced resin and an outer casing of injected thermoplastics molded onto the insert which is embedded within the mass of said outer casing and is prestressed by shoulders 5 and 6 provided on overlapping portions 3 and 4 of casing 2, after cooling of the same.

Abstract: A protective helmet for a driver of, or passenger in, a vehicle, which helmet comprises a rigid protective shell and a fastening device comprised essentially of a rigid skirt extending around the base of the shell of the helmet with the interposition of padding inside the skirt and adapted to conform to the lower part of the head. The skirt is composed of two rigid half-skirts hinged on the helmet at opposite points of said base, and the base of the shell of the helmet includes two locking means thereon with additional fixing means on at least one half-skirt. The fastening device ensures the holding of the helmet on the head and prevents its being torn off, even in the case of a fall with successive impacts.