Abstract:
A diving snorkel having a mouth portion and a main pipe molded from thermoplastic materials. There are two extending folding pieces and two matching recesses on the upper end. After the two folding pieces are pressed into the recesses by the external force, an anti-water piece is formed.

Description:
FIELD OF THE INVENTION 
     This invention relates to diving snorkel allowing a diver to breath as the diver swims under water. 
     BACKGROUND OF THE INVENTION 
     Typical structure of diving snorkel (as shown in FIG. 1) is generally divided into three parts: a mouth portion is below, a breathing tube is in the middle and an anti-water piece is above. The mouth portion is a hollow tubular structure, and includes three passages: a passage passes up to the breathing tube; a passage in a bending tube that passes to the mouthpiece; and another downward passage passes to a water outlet. There is a non-return valve provided on the water outlet, such that the water can be let out and cannot come back in. The bore breathing tube is a hollow tube and connects up to the anti-water piece and down to the mouth piece. The anti-water piece reduces the water coming in as much as possible and allows air to come in. The air passes up to the mouthpiece through the breathing tube. The water falls into the water outlet of the mouthpiece along the breathing tube due to gravity and the water outflows downward from the non-return valve due to the pressure that the diver may intensely breathe out through the mouthpiece to expel out the water. These three parts are generally manufactured separately, and are assembled by means of preset clamping members. Most products which are commercially available belong to these types. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide a structure in which the anti-water piece and the breathing tube can be directly molded together, above has a function of the against water piece, with a down side having a function of the bore breathing tube, and a diving snorkel is assembled with the mouth portion by means of manual pressure deformation. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a side view of a prior art. 
     FIG. 2 is a side view of a breathing tube of the present invention. 
     FIG. 3 is a sectional view of the enlarged area A in FIG.  1 . 
     FIG. 4 is a side view of the anti-water piece of the present invention. 
     FIG. 5 is a side view showing an action with which the waterproof pieces are placed in the recesses by means of pressure. 
     FIG. 6 is a side view of another embodiment for the main pipe of the present invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     As shown in FIG. 2 the constitution of the breathing tube for the present invention includes a mouth portion  10  and a main pipe  20 . The structure of the mouth portion  10  is the same as the conventional structure, main pipe  20  includes an air pipe  21  and an anti-water device  22 , usually above line W which represents approximately the water level. The constitution of the mouth portion  10  includes a mouthpiece  11  and a bottom chamber  12 . The mouthpiece  11  is the same as the conventional device, in which the air is directed to the mouthpiece by a bending air pipe. The water above the main pipe  20  can be received in the bottom chamber  12 , with a non-return valve provided below the bottom chamber  12 , which enables outflow of the water. 
     FIG. 3 is an enlarged sectional view of anti-water device  22  including an opening  23 , two water outlets  24 ,  25 , and two waterproof pieces  26 ,  27 . The opening  23  provides an inlet and an outlet for air. The two waterproof pieces  26 ,  27  crisscross each other, each front edge crossing centerline D. The water falling in through the opening  23 , is respectively separated by the waterproof pieces  26 ,  27  and outflows the breathing tube through the water outlet  24 ,  25 . If a slight amount of water remains in the main pipe  20 , it will fall to the bottom chamber  12  due to the gravity, and will outflow during breathing out. 
     FIG. 4 shows a state during manufacture of the main pipe  20  which is made from thermoplastic elastic and flexible materials. There is a waterproof piece  26 , 27  on each side above the hollow tubular main pipe  20 . The waterproof pieces  26 ,  27  are connected to the pipe body of the main pipe  20 , by connecting parts  261 ,  271  which are thinner than its thickness. There are folding recesses  262 ,  272  provided in the approximate middle of the waterproof pieces  26 ,  27 . The thickness of the external edges  263 ,  273  for the waterproof pieces  26 ,  27  match with the recesses  241 ,  251  positioned in the water outlets  24 ,  25 . Recesses  241 , 251  provided on both sides of the holes, which can be inserted by the external edges  263 ,  273  of the waterproof pieces  26 ,  27 . 
     After the main pipe  20  is molded with the connected parts  261 ,  271 , the folding recesses  262 ,  272  are bent by means of pressing on the waterproof pieces  26 ,  27 , such that the external edges  263 ,  273  are inserted into the recesses  241 ,  251 . The waterproof pieces  26 , 27  are stretched along the direction of the recesses  241 , 251  when the pressing pressure is eliminated. At this time the waterproof pieces  26 , 27  are fixed in the water outlets  25 , 26  (as shown in FIG.  2  and FIG.  3 ). 
     FIG. 6 illustrates another embodiment of the waterproof device which has three waterproof pieces  31 ,  32 ,  33  and three water outlets  34 ,  35 ,  36 . The construction of the waterproof pieces  31 , 32 ,  33  is the same as above-mentioned two waterproof slices  26 ,  27 . 
     The structure below the main pipe  20  is the same as the conventional device which is connected with the mouth portion  10  by clamping. 
     In summary, the waterproof pieces  26 ,  27  are fixed in the recesses  241 ,  251  by means of manual pressure, which is formed during projection molding with the structural design of the main pipe  20 , thus forming the water outlets  24 ,  25 . The structure having the anti-water part is formed above the main pipe  20 , and is integrated with the breathing tube, enabling easy manufacture and lower cost.