Surgery – Respiratory method or device – Draw-type snorkel
Patent
1997-02-27
1999-02-09
Weiss, John G.
Surgery
Respiratory method or device
Draw-type snorkel
12820127, A62B 762
Patent
active
058681299
ABSTRACT:
The instant invention is a skin diving snorkel having a conduit with an open end above the water surface, and an underwater end which terminates in a collapsible chamber. A mouthpiece adjacent and above the chamber provides a flow path between the conduit and the interior of the diver's mouth. A check valve in the opening between the conduit and the chamber allows water to flow from the conduit into the chamber, but not in the reverse direction. The chamber also has a purge valve which allows water in the chamber to flow to ambient. When the hydrostatic pressure within the snorkel is greater than ambient, water will flow sequentially through the check valve, chamber and purge valve to ambient. Consequently, water in the snorkel which extends above the ambient water surface will ultimately drain through the purge valve, decreasing the amount of water remaining within the snorkel to be purged. The chamber volume and double valve arrangement inhibit the flow of air through the purge valve during a purging exhalation, minimizing the wasteful loss of purging air. The chamber can be manually or mechanically collapsed, which reduces the chamber's internal volume. Collapsing the chamber will force air or water within to flow out the purge valve. When the collapsing force is removed, a spring, or alternately, the resilient construction of the chamber itself, will cause the chamber to expand back to its original internal volume. The expanding chamber will pull water from the conduit through the check valve into the chamber. Alternately collapsing and expanding the chamber will pump water from the conduit to ambient without resorting to an explosive exhalation.
REFERENCES:
patent: 4708135 (1987-11-01), Arkema
patent: 5193530 (1993-03-01), Gamow et al.
patent: 5438977 (1995-08-01), Gomez et al.
patent: 5487379 (1996-01-01), Koshiishi
patent: 5535734 (1996-07-01), Lu et al.
patent: 5671728 (1997-09-01), Winefordner et al.
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