| 摘要 |
<p>Breathing apparatus, particularly for use in passenger aircraft, provides a battery-powered centrifuge mounted under the passenger seat and delivering downstream through a catalytic filter to an ori-nasal mask and hood assembly having similar filter means. The delivery tube from the centrifuge is a friction fit in the mask and readily disconnected for mobile use of same. Disconnection automatically seals the opening and the user then can draw external air through the filter and/or clean air or oxygen from the reservoir thereof constituted by the hood during mobile use. One-way valves control inhalation and exhalation. The hood is extensible and collapsible to provide a visual indication of the extent of the oxygen reservoir remaining.</p> |
