Sierra Engineering Co.

Donald G Davis

John Wippler

David L Heitman

A face mask for supplying oxygen to personnel such as flight crews during times when there is inadequate air available, has fitted to it a device containing a passageway leading from the interior to the exterior of the mask, and a manually operable, slidable valve stem adapted in a first position to block the exit through the passageway of gas within the mask, and in a second position to open the passageway to permit the flow of gas from the interior to the exterior of the mask. The exit opening from the passageway is located at the upper nose area where it will be encompassed within the cavity of a goggle fitted over the vicinity of the eyes of the user. By manually moving the valve stem to the position where the passageway is open, oxygen from within the face mask is forced into the goggle cavity to flush out from the goggle cavity any smoke or noxious gas which may be present within it.

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Azusa, CA, United States of America

Donald G Davis