Importance

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Abstract

The following specification discloses a breathing gas mask having an elastomeric or plastic main body portion supported by a head band formed with a number of supporting straps for holding the mask to a user's face. The mask has a large viewing lens with an elongated protuberance in the form of a bead extending around the periphery of the viewing lens for purposes of protecting the major lens surface from exposure to impacts and scratching when it is laid on its face. The mask incorporates an oral nasal interior breathing cover with a speaking diaphragm in adjacent relationship thereto to allow for the intake of breathing gas into the oral nasal mask area while allowing for exhalation through a poppet valve in connected relationship to the oral nasal mask. The outer mask seal incorporates a flared interior seal member around the inner periphery thereof which incorporates a compound curve having variable cross sectional shapes around the periphery thereof to allow for a tightened seal to a user's face.

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First Claim