Safety helmet for motor-cyclists provided with manually-adjustable ventilation means

Claim 1

Safety helmet equipped with internal channels for the ventilation and the cooling of the internal area, characterized in that said helmet is provided at the top of its external rigid cap, with at least one opening or air intake, in communication with said air channels and provided in the cap and through the underlying protective layers, above which an aerodynamic guide fin is positioned at a short distance from the external surface of the cap, which is so shaped as to create, between the cap and the guide fin, a duct having a cross-section with a surface area decreasing towards the rear portion of the helmet, capable of enabling an air stream flowing through said duct to locally undergo, in correspondence of said air intake, a speed increase, with a such a decrease in the local pressure as to determine a suction of warm air from the interior of the helmet, with said warm air flowing towards the outside through the outlet of said air intake, with between said guide fin and the external surface of said cap an adjustment element of slider type being provided, guided on said guide fin, and manually adjustable in correspondence of said air intake, with said slider being so shaped and positioned as to constitute, besides a flow shutter, also a baffle plate, capable of favouring the intake of warm air from the interior of the helmet.