| 摘要 |
PROBLEM TO BE SOLVED: To provide a full-face oxygen mask capable of being adjusted in the size of its harness, widened in its visual field and capable of conforming to the size or shape of every head by providing a flexible lens to the flexible face seal surrounding the lens and attaching the harness composed of an expansible flexible tube to the face seal so as to position around the rear part of the head of a wearer. SOLUTION: A mask assembly 10 is constituted of a face seal made of an elastomer fitted to the periphery of the face of a wearer, a flexible lens 14, an oxygen supply adjusting device 16 and an expansible harness 18. The flexible lens 14 made of an elastomer is attached to the face seal 12 by adhesion or insertion. The adjusting device 16 supplies breathing oxygen to a mask wearer and further supplies oxygen or other breathing gas mixture to a breathing air adjusting device and the harness 18 connected to the face seal 12 through a mask gas passage. Connection straps 20, 22 are connected by a connector 24 and the size or comfortableness of an expanded mask is adjusted by the connector 24. |
