Underwater mask with water and breathing air discharge system

1. A mask for underwater use, comprising:

a frame;

a transparent part supported by the frame;

a gasket part mounted on the frame and designed to be positioned on a face of a user, the gasket part comprising:

a partitioning wall designed to rest on the user's nose when the mask is worn so as to form an upper chamber and a lower chamber sealingly separated from each other and with the lower chamber configured to accommodate the user's nose and mouth, wherein the upper chamber and the lower chamber are connected through a passage provided in the partitioning wall and at least one inner one-way valve so that air can pass from the upper chamber to the lower chamber but not vice versa; and

a perimeter edge designed to rest on the perimeter of the user's face to laterally delimit said upper and said lower chamber,

wherein the perimeter edge of the gasket part comprises one single discharge opening, which is located at a region adapted to be arranged near the user's mouth and which is a seat of a valve non-return mechanism, the valve non-return mechanism comprising a valve seat and a valve applied to said single discharge opening for expulsion from the lower chamber of breathed gases and simultaneously with any water present in said lower chamber;

a snorkel comprising at least one first channel and at least one second channel which connect the upper chamber and the lower chamber, respectively, with an external environment;

at least one discharge duct arranged on the perimeter edge of the gasket to convey exhaled air into the at least one second channel of said snorkel by means of a pair of discharge ducts arranged on the perimeter edge and adjacent thereto; and

a lower connection arranged in a lower part of the perimeter edge of the gasket near said one single discharge opening with said at least one discharge duct configured to convey therein the exhaled air running from an outer valve;

wherein the mask is configured such that the exhaled air enters the one single discharge opening prior to entering the at least one discharge duct.

2. The mask for underwater use according to claim 1 , wherein the outer valve comprises at least one outer valve seat and a bleed valve, and further wherein said lower connection comprises at least one opening accommodating or integral to the at least one outer valve seat that contains the bleed valve to expel the water coming from the lower chamber and/or coming from the at least one discharge duct.

3. The mask for underwater use according to claim 1 , wherein the valve non-return mechanism is of membrane type and comprises:

the valve, comprising a membrane cut-off made of an elastic, flexible material; and

the valve seat comprising at least one passage opening surrounded by a continuous surface closed on itself that sealingly contacts at least one corresponding sealing lip of the membrane cut-off, and further has one or more central ribs which form an intermediate support for the membrane cut-off, said ribs being arranged radially and in a plane of said valve seat.

4. The mask for underwater use according to claim 1 , wherein

the snorkel has an upper terminal connection between the snorkel and the mask, the upper terminal connection being fixed on the mask and being connected to the snorkel with a joint which has a coupling position in which the upper terminal connection and the snorkel are fixed in operating position and a releasing position from the upper terminal connection in which the snorkel remains connected to the terminal connection, but can freely swing.

5. The mask for underwater use according to claim 4 , wherein the upper terminal connection comprises a central duct and two side ducts, the central duct and the two side ducts engaging, at an end thereof, extensions of the at least one first channel and the at least one second channel of the snorkel, wherein an opposite end of the upper terminal connection is closed and has winglets for engaging corresponding winglets that are on the frame, the corresponding winglets on the frame being held in position by a hooking surface present on the transparent part when the mask is assembled.

6. The mask for underwater use according to claim 5 , wherein the upper terminal connection has a pair of openings for engaging the pair of discharge ducts, the pair of discharge ducts connecting the lower chamber with the at least one second channel of the snorkel.

7. The mask for underwater use according to claim 6 , wherein the pair of discharge ducts are connection tubes arranged outside both the frame and the gasket part.

8. The mask for underwater use according to claim 6 , wherein the pair of discharge ducts are located within the frame.

9. The mask for underwater use according to claim 1 , wherein the transparent part has a polygonal shape with squared connecting facets.