Visor (B) is secured to helmet (A) by hinge devices (C) each consisting of an arched guideway (12) for a slider (10). The pattern of guideway (12) in its rear terminal tract is such as to draw slider (10) toward the rear top part of the helmet to ensure engagement of visor edge (B) to the bottom of edge (A1) of the helmet's opening. Likewise, the front terminal tract of arched guideway (12) is conceived in a manner such as will ensure elastic engagement of top edge (34) of the visor with the curved top surface (A2) of the helmet when the visor is lifted. Notches and elastic teeth (26-27) are provided between arched guideway (12) and slider (10); the notches and teeth make it possible to form between visor edges (B) and the opening of helmet (A), a ventilation slot for de-fogging the visor. Ventilation of the helmet is further improved by slots (52) in the front-rear part (A3) of the helmet connecting the exterior with a chamber (50) which outlets at visor (B) through a slot.
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