| 摘要 |
FIELD: life saving equipment. ^ SUBSTANCE: mask has shield of hemi-spherical shape provided with head part, air channels, air distribution insert, air receiving connection pipe, outlet nozzle and safety valve. Hemi-sphere and oval head part are aligned one with another and formed of optically transparent air-tight material with slot-like elastic channels communicating with stretched inner walls. One channel enters in hollow end of mask hemisphere hole, another channel is formed in hollow oval head part terminating with air-distribution insert at under-mask space. Another channel end connects with air intake connection pipe of ellipsoidal cross-section. ^ EFFECT: reduced cost, anthropometrical universality, increased operational and protective efficiency. ^ 3 cl, 4 dwg, 1 tbl |
