| 摘要 |
<p>A breathing apparatus has first bellows (31) and second bellows (41), the first bellows (31) being so designed as to expand by a part of air exhaled by the diver or wearer of the breathing apparatus being supplied thereto through a mouth piece (4) and the second bellows (41) being so designed as to contract as the pressure of a surrounding atmosphere around the breathing apparatus, i. e., the atmospheric pressure under water. When the sum of an expanded amount of the first bellows (31) and a contracted amount of the second means (41) reaches a value which is equal to or larger than a predetermined value, an exhalation discharg valve (61) disposed on a mouth piece (4) is so opened as to discharge the exhaled air into a surrounding atmosphere around the breathing apparatus. This arrangement for the breathing apparatus enables the number of times of re-utilizing the exhaled air as air for inhalation to increase as the pressure of the surrounding atmosphere increases.</p> |
