Abstract: A protective helmet including a rigid shell and an electronic connecting device mounted on the shell, the connecting device including an electronic circuit, first means for connecting said circuit to a power supply system, and second means for connecting said circuit to at least one accessory that can be mounted on the helmet, wherein the connecting device is mounted on the shell in an opening formed in said shell.

Abstract: A helmet includes a shell, a support element mounted on the shell, on the outer side thereof and above the facial opening, and at least a first visor mounted pivoting in relation to the shell around a pivot axis, between a lowered use position and a high retracted position. An articulating means is provided between the support element and the shell, to allow said support element to pivot in relation to the shell around a transverse axis situated in the vicinity of the back edge of the support element, between a lowered use position, in which said support element covers a portion of the shell, and a raised position. A locking means is also provided for locking the support element in the lowered position.

Abstract: The invention relates to a plastic part of a protective helmet, characterised in that the parts undergo a treatment in order to improve the technical specifications thereof, in particular the mechanical strength of a part of a protective helmet at low and high temperatures, said treatment comprising the application of ionising radiation to the parts.

Abstract: Supplementary padding (8), for a protective helmet (1) includes a T-shaped envelope (9) designed to be removably affixed inside the helmet. The envelope is made of a flexible material and defines pockets for receiving supplemental padding elements (10a, 10b, 10c, 10d), optionally made of synthetic foam. The envelope includes at least one opening for inserting the supplemental padding elements into said envelope and a self-gripping textile (21a, 21b, 21c, 21d) for releasably adhering the envelope to lining (7) of the helmet.