| 摘要 |
A facial mask assembly has a rigid shell (3), a flexible hose (12), and a swivel hose coupling (10) for connecting the rigid shell (3) to the flexible hose (12), the coupling (10) having first (14) and second (16) rigid sections. The first rigid section (14) is mounted to the rigid shell (3), for rotation relative to the rigid shell (3) about a first rotational axis (18). The second rigid section (16) is mounted to the flexible hose (12) for rotation relative to the flexible hose (12) about a second rotational axis (22). The coupling (10) further includes means for mounting the first (14) and second (16) rigid sections for rotation relative to each other about a third rotational axis (24). <IMAGE> |
