초록 ▼

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 be

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.

대표청구항 ▼

A breathing gas mask having a major plastic lens surface therein for viewing formed as a separate lens portion and connected to the remainder of the mask as an initially separable item wherein the improvement comprises: said lens surface having a raised bead portion projecting outwardly therefrom in

A breathing gas mask having a major plastic lens surface therein for viewing formed as a separate lens portion and connected to the remainder of the mask as an initially separable item wherein the improvement comprises: said lens surface having a raised bead portion projecting outwardly therefrom in at least a portion of the peripheral region thereof for causing said lens to rest thereagainst instead of on the major lens surface to remove the major lens surface of the lens from a surface upon which it is placed so that it lies is speced relationship therefrom as supported by the raised bead portion.