Surgery – Respiratory method or device – Draw-type snorkel
Patent
1988-12-30
1989-10-10
Eickholt, E. N.
Surgery
Respiratory method or device
Draw-type snorkel
272DIG1, B63C 1116
Patent
active
048724530
ABSTRACT:
The present invention is an improved skin diving snorkel having a conduit with an unobstructed, open end above water and an underwater end which has an upward opening mouthpiece. The mouthpiece provides a flow path from the conduit to the interior of the diver's mouth. A purge valve, situated adjacent and below the mouthpiece, allows water in the snorkel to flow to ambient when hydrostatic pressure within the snorkel is greater than ambient. A chamber, intersecting the conduit at approximately mid-length, houses a float member. When the snorkel is filled with water the float member is buoyed into the conduit and blocks upward flow therein.
The flooded snorkel is purged by exhaling into the mouthpiece. Because the float member blocks upward flow when the conduit is flooded, the upwardly expanding exhaled air is trapped beneath the float member. The trapped air displaces the water in the conduit, forcing the water down and out the purge valve. Exhalation pressure holds the buoyant member in the blocking position until the purging exhalation is complete. Release of exhalation pressure at the start of inhalation allows the buoyant member to drop back into the chamber, clearing the conduit for unrestricted respiration.
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patent: 4708135 (1987-11-01), Arkema
patent: 4793341 (1988-12-01), Arasmith
patent: 4805610 (1989-02-01), Hunt
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