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Breathing equipment for aircrew

  • US 5,649,532 A
  • Filed: 01/18/1995
  • Issued: 07/22/1997
  • Est. Priority Date: 05/05/1992
  • Status: Expired due to Fees
First Claim
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1. Breathing apparatus for aircrew comprising a rigid outer shell in which a flexible face-piece is received whose periphery is adapted to make a seal with the pilot'"'"'s face, the face-piece incorporating an inspiratory and expiratory valve and the outer shell having means for attaching it at a fixed distance from the wearer'"'"'s face, the face-piece further including extendable means automatically operable to press the periphery of the face-piece towards the pilot'"'"'s face to improve the seal therewith when gas at a pressure above that required for normal breathing is supplied to the facemask and the extendable means reconfigured as a result thereof, the improvement comprising transparent viewing means disposed in the wearer'"'"'s line of sight and on the rigid outer shell in a fixed position relative thereto, said viewing means thereby being maintained at a fixed distance relative to the wearer'"'"'s eyes.

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