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Underwater oxygen supply system

  • US 5,411,018 A
  • Filed: 05/26/1994
  • Issued: 05/02/1995
  • Est. Priority Date: 05/26/1994
  • Status: Expired due to Fees
First Claim
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1. An underwater breathing apparatus having a pressurized air tank, a primary breathing apparatus, and a separate secondary breathing apparatus with mouthpiece wherein the improvement comprises:

  • (a) a pressurized oxygen tank secured to the air tank;

    (b) a first conduit coupled to the air tank and a separate second conduit coupled to said oxygen tank;

    (c) a gas mixing valve coupled to both said conduits intermediate the secondary breathing apparatus and said conduits, said gas mixing valve comprising;

    i. selector switch means for selectively supplying either pressurized air from the air tank, pressurized oxygen from said oxygen tank, or a pressurized air/oxygen mixture to the secondary breathing apparatus;

    ii. an internal mixing chamber for combining said pressurized air and said pressurized oxygen therein prior to delivering said pressurized air/oxygen mixture to the secondary breathing apparatus; and

    ,iii. check valve means for preventing backflow through said gas mixing valve.

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