| 摘要 |
In emergency escape breathing apparatus a half mask 5 mounted near a visor part of a hood 1 engages the nose and mouth of the wearer so that the gases breathed by the wearer are inhaled from and exhaled to the interior of the half mask 5 and thence to a reservoir of breathable gas such as the interior of the hood 1 outside the half mask 5. Exhaled gases are regenerated by passage through potassium superoxide material 8 or 11 located either in the walls of the half mask 5 (Figs. 1 and 2) or in a container 10 mounted to the hood 1 near to the visor part of the hood 1 (Figs 3, 4 and 5). The potassium superoxide absorbs carbon dioxide in the presence of moisture and generates oxygen in proportion to the carbon dioxide absorbed. The gases pass through the potassium superoxide material 11 during both inhalation and exhalation (Figs 1, 2 and 3) or alternatively make a single passage through the potassium superoxide material 11 either on exhalation (Fig. 4) or inhalation (Fig. 5). <IMAGE> |
