| 摘要 |
<p>When viewed in a cross section taken along an axial direction (50a), a breathing hose (50) for a diving breathing device comprises a circumferential wall (51) constituted by an outwardly projecting thicker portions (52) flat on an internal circumferential surface thereof and thinner portions (53) bent inwardly at a small curvature which are disposed in an alternate fashion. Since the internal circumferential surface (51a) is practically a flat surface, there is no risk of causing a sanitary problem as is encountered with a bellows hose where dirty matters accumulate in recessed portions to permet propagation of various germs. In addition, thinner portions provide flexibility required for a breathing hose. <IMAGE></p> |
