Combined ventilation device for helmets for motorcyclists

A combined internal ventilation device for helmets for motorcyclists comprising:

• a first plate-like element, having a substantially polygonal arched form, forming a front covering (1) that can be fittingly housed in a corresponding opening of a helmet cap (2) and flush with it;
• a second plate-like element, forming a back covering (18), that can also be fittingly housed in a corresponding opening of cap (2) and far from said front covering (1);
• a bearing plate (24) anchored under said front covering (1) and at a short distance from this, in order to define a housing for kinematic control elements of the ventilation device;
• two air intakes (5, 6), obtained in said frontal covering (1), laterally with respect to an opening (3) located in central position, and to a further opening (7) designed to house key-means (7a) for the closing activation of all the air intakes (3, 5, 6), said air intakes (5, 6), and a central air intake (3) and said further opening (7) being closed by wings (5a, 6a, 3a) that can be opened only towards the inside and kept in closing position through suitably preloaded springs;
• a canal (20) connecting the inside of said housing for the kinematic control elements with an exhaust opening obtained in said back covering (18) and provided with an additional wing (17) that can be opened and kept in a closed position by a preloaded spring, said canal (20) forming a duct with the internal surface of the cap (2), said duct being intended for the suction of warm air from the helmet and for exhausting it towards the outside of said helmet through said exhaust opening;
• and
• a plate (13) sliding, with a limited travel, between said front covering (1) and said bearing plate (24) extended in the inside of said duct to allow the activation of said additional wing (17) closing the exhaust opening of warm air, said sliding plate (13) being provided with means for hooking and unhooking (10-12) with the end of a positioning lever (14) and a leaf lever (22) so arranged as to allow sequential activation of two of said wings (5a, 6a) of the air intakes, and a third wing (3a) and the key-means (7a) of all wings, between said sliding plate (13) and said front covering (1) there being also provided a system of fixed strikers (15, 16) located between the wings (5a, 6a) of the air intakes and said bearing plate (24), said positioning lever (14) together with said leaf and said sliding plate being so arranged as to allow, by a first pressure action on said third wing (3a), the opening of the two side intakes (5, 6), with return of the third wing (3a) to a closing position and, by means of a second pressure on said third wing (3a), up to allow its stopping in an open position, also the opening of the additional wing (17) of the warm air exhaust, the simultaneous return to a position of total closing of all the wings being obtained by a pressure exercised on said key means (7a) provided for the closing of all the air intakes.