Surgery – Respiratory method or device – Draw-type snorkel
Patent
1988-12-30
1989-10-31
Eickholt, Eugene H.
Surgery
Respiratory method or device
Draw-type snorkel
272DIG1, B63C 1116
Patent
active
048770221
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 terminates in a chamber. The chamber houses a normally closed float valve in series with an outwardly directed purge valve. The purge valve allows water in the snorkel to flow to ambient when hydrostatic pressure within the snorkel is greater than ambient. The chamber also serves to accumulate water which drains down the conduit after a purging exhalation or after splashing in the open end. A mouthpiece adjacent and above the chamber provides a flow path from the conduit to the interior of the diver's mouth.
The float valve opens when the chamber is flooded with water. Consequently, water in the snorkel which extends above the ambient water surface will drain through the purge valve, decreasing the amount of water remaining within the snorkel to be purged. The float valve blocks flow through the purge valve when the chamber is emptied of water during a purging exhalation, preventing the wasteful loss of purging air. Water which accumulates in the chamber between purges is eliminated when the snorkel is next purged.
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patent: 4610246 (1985-03-01), Delphia
patent: 4708135 (1987-11-01), Arkema
patent: 4793341 (1988-12-01), Arasmith
patent: 4805610 (1989-02-01), Hunt
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