Breathing device for divers

Abstract

A breathing device for divers comprises a mouthpiece and a rigid breathing tube with a first end featuring an inclined opening, and a second end connected to a joint of the mouthpiece, a movable shutter that can move between an open and a closed position of the opening of the first end, a float for actuating the shutter, first articulation means for connecting the shutter to the tube, and second articulation means for connecting the float to the tube wherein the breathing tube is formed from a single tubular piece, externally to which the first and second articulation means are positioned.

What is claimed is: 
     
         1 . A breathing device for divers, the breathing device comprising:
 a mouthpiece,   a rigid breathing tube having a first end with an inclined opening and a second end connected to a fitting of the mouthpiece,   a shutter movable between an open position and a closed position of said opening of said first end,   a float for actuating said shutter,   a first articulation means of said shutter to said tube,   a second articulation means of said float to said tube,   characterized in that said breathing tube is formed from a single tubular piece externally to which said first and second articulation means are positioned.   
     
     
         2 . The breathing device for divers according to  claim 1 , characterized in that at least a terminal portion of the breathing tube comprising said first end and externally presenting said first and second articulation means has a tubular internal perimeter profile with a constant cross-sectional area. 
     
     
         3 . The breathing device for divers according to  claim 2 , characterized in that the breathing tube has a tubular internal perimeter profile with a constant cross-sectional area. 
     
     
         4 . The breathing device for divers according to  claim 3 , characterized in that the breathing tube has a tubular internal perimeter profile with a constant elliptical cross-sectional area. 
     
     
         5 . The breathing device for divers according to  claim 4 , characterized in that the second articulation means comprise a swinging cap for protective covering of said first end of the breathing tube, said cap having a positioning seat where the float is fixed. 
     
     
         6 . The breathing device for divers according to  claim 1 , characterized in that said first articulation means comprise a first pair of rotation pins defining a first hinge axis integrally formed with said tube, and said second articulation means comprise a second pair of rotation pins defining a second hinge axis integrally formed with said tube. 
     
     
         7 . The breathing device for divers according to  claim 5 , characterized in that said first articulation means comprise a first pair of rotation pins defining a first hinge axis, and said second articulation means comprise a second pair of rotation pins defining a second hinge axis, said first pair of rotation pins and said second pair of rotation pins being formed on an externally fitted support to said tube. 
     
     
         8 . The breathing device for divers according to  claim 7 , characterized in that said second pair of pins hinge said cap to said breathing tube. 
     
     
         9 . The breathing device for divers according to  claim 6 , characterized in that said first and second hinge axes are parallel. 
     
     
         10 . The breathing device for divers according to  claim 9 , characterized in that said first hinge axis is interposed between said first end and said second hinge axis. 
     
     
         11 . The breathing device for divers according to  claim 5 , characterized in that said float is made of a closed-porosity deformable material block press-fitted into said positioning seat. 
     
     
         12 . The breathing device for divers according to  claim 7 , characterized in that said first articulation means comprise a bracket having two parallel arms projecting from the tube extending orthogonally from the first hinge axis and connected by a crossbar, and in that said shutter is equipped with a counterweight and is rigidly fixed to said bracket. 
     
     
         13 . The breathing device for divers according to  claim 12 , characterized in that said shutter extends from a flat flange of the crossbar of said bracket orthogonal to the two arms of said bracket. 
     
     
         14 . The breathing device for divers according to  claim 12 , characterized in that the cap has a sliding wall for said bracket.