Let's start with Duarry's patents, as these documents are for the most part all that I have been able to find in the way of illustrations. Here's my translation of Duarry's snorkel patent:
DESCRIPTIVE REPORT entitled: «PERFECTED SNORKEL FOR UNDERWATER SWIMMING».
Applicant: Don JUAN DUARRY SERRA, of Spanish nationality, resident in BARCELONA, Calle Rosellón 1.
The present invention relates to a snorkel for underwater swimming of the type that includes a straight section terminated by its upper end in a curved portion shaped like a rod, provided in its mouth with a shut-off valve, and by its lower end in another curved portion associated with the nozzle with its corresponding air expulsion valve.
In accordance with the present invention, the mentioned straight section is constituted by several truncated cone-shaped pieces telescopically, and the upper curved portion presents at the place of its start an outer flange of diameter corresponding to the inside of the upper mouth of the lower truncated conical piece , so that by folding the different pieces into each other, said mouth fits hard against the said flange, keeping the assembly firmly attached. This achieves that this perfected breathing tube occupies a small space in the collected position, thus facilitating its comfortable transport in backpacks, bath bags, etc.
Another feature of the invention is that the hollow spherical body of elastic material of the shut-off valve of the air inlet mouth of the upper curved portion is provided with a cylindrical appendix, provided with a head at its free end, which it is slidably fastened in an annular guide disposed inside said mouth, concentrically with respect to its edge, which constitutes the valve seat, and which allows the spherical body to be applied against or separated from said seat, although remaining always linked with said mouth.
The accompanying drawing illustrates by way of example, not limitation, an embodiment of the perfected snorkel in question, showing:
Fig. 1 a side view, partially in vertical section, of said tube with its telescopic section extended;
Fig. 2 a side view analogous to that of Fig. 1, also partially in vertical section, but illustrating its collected telescopic section; and
Fig. 3 a cross-section of the shut-off valve of the air inlet, according to III-III of Fig. 1.
The respirator represented represents a straight section consisting of three truncated conical pieces 1, 2, and 3, telescopically interlocked, a portion curved in the way of a rod, provided in its mouth with a shut-off valve, and a curved portion 5 that carries associated the nozzle 6 with its corresponding air expulsion valve 7. The curved portion 4, firmly attached to the upper end of the tubular frustoconical piece 3, presents at the place of its start an outer flange 8 of diameter corresponding to the inside of the upper mouth 9 of the lower frustoconical piece 1, so that by refolding the different pieces 1, 2 and 3 of the telescopic section as illustrated in Fig. 2, the mentioned mouth of the tubular piece 1 fits hard against the flange 8, maintaining the tightly attached set.
The shut-off valve of the air inlet, which currently has a spherical hollow body 10 intended to act as a float, differs from the known valves by the fact that said spherical body is provided with a cylindrical appendix 11, provided of a head 12 at its free end, which is slidably held in an annular guide 13 disposed inside the mouth of the curved portion l, concentrically with respect to its edge 14, which constitutes the valve seat. Said cylindrical appendix 11 with its head 12 maintains the spherical body 10 permanently connected with the mouth of the curved portion 4, and since said appendix is slidable axially in the annular guide 13, said spherical body 10 is normally maintained, by gravity, at a certain distance from the valve seat 14, as can be seen in the drawing, allowing air to freely enter through said mouth of the portion 4. On the contrary, when the repeated hollow spherical body 10 is submerged in the water, applied as a float against the edge 14 of said mouth, obtaining it and thus preventing water penetration. ¡: Due to the simplicity of this shut-off valve and that the guide members of the spherical body 10 are arranged on the inside of the curved portion 4, its operation is safe and any possibility of failure is excluded.
It is noted that everything that does not alter, change or modify the essence of the invention may be subject to variations in detail.
NOTE
The utility model requested falls on the following claims:
1 °. - Snorkel perfected for underwater swimming, comprising a straight section terminated by its upper end in a curved portion as a rod, provided in its mouth with a shut-off valve that involves a spherical hollow body, and by its lower end In another curved portion, the nozzle is associated with its corresponding air expulsion valve, characterized in that the mentioned straight section is constituted by several truncated conical rods (1, 2, 3) telescopically fitted together, and the upper curved portion (4) it presents at the place of its start an outer flange (8) of diameter corresponding to the inside of the upper mouth (9) of the lower frustoconical piece, so that when folding the different telescopic pieces (1, 2, 3) into each other, said mouth (9) fits hard against the said flange (8), keeping the assembly firmly attached.
2 .- Improved snorkel for underwater swimming according to claim 14, characterized in that the spherical hollow body (10) of the shut-off valve of the air inlet mouth of the upper curved portion (4) is provided with a cylindrical appendix ( 11), provided with a head (12) at its free end, which is slidably held in an annular guide (13) arranged inside said mouth, concentrically with respect to its edge (14), which constitutes the valve seat, and which allows the mentioned spherical body (10) to be applied against said seat (14) or separated from it, although always remaining connected with said mouth.
3 .- SNORKEL PERFECTED FOR UNDERWATER SWIMMING, as described and claimed herein that consists of six sheets typed on one side and a sheet of drawings.
BARCELONA, May 16, 1957.
JUAN DUARRY SIERRA
P.P.