Underwater-breathing device

Claim 1

An underwater-breathing device for attachment to a scuba regulator for selectively breathing either stored air from an air tank while the diver is in deep water, or ambient air through a snorkel while he is submerged just uner the surface of the water, the device comprising: a snorkel tube adapted to allow the passage of air therethrough when the open end thereof is disposed just above the water surface; a scuba regulator adapted to be interconnected to said snorkel tube; a mouthpiece for receiving air from said snorkel tube or said scuba regulator; a valve means for selectively allowing air flow from said air tank or said ambient air through said snorkel, said valve means having a first, a second, and a third port, wherein said first port communicates with said snorkel tube, said second port communicates with said mouthpiece, and said third port communicates with said scuba regulator, and wherein said valve means comprises; a valve housing having a longitudinal bore formed therein, said first port being formed at one end of said longitudinal bore, and said second and third ports being oppositely disposed to each other and positioned intermediate the ends of said longitudinal bore; and a valve core slidably disposed in said longitudinal bore having first and second air-flow passages arranged to be selectively positioned between respective ports of said housing, said first air-flow passage being adapted to allow communication between said first and second ports when said valve core is positioned to allow air to pass from said snorkel tube through said mouthpiece, and said second air-flow passage being adapted to allow communication between said second and third ports when said valve core is positioned to allow air to pass from said regulator through said mouthpiece; means for selectively positioning said valve means to allow air to flow between said first and said second ports, and said second and said third ports; wherein said means for selectively positioning said valve means comprises: a pin member attached to said valve core; a knob member secured to said pin; and an elongated slot formed in said valve housing to receive said pin therethrough, whereby said pin can move longitudinally therein to provide longitudinal movement to said valve core for selectively aligning said flow passages with respective corresponding ports; and a detachable coupling means is interposed between said third port and said scuba regulator.