GENERAL-PURPOSE FILTERING RESPIRATOR Russian patent published in 1997 - IPC

FIELD: multifunctional individual protective devices used under elevated temperature conditions. SUBSTANCE: respirator has helmet with inner fittings and belt secured under chin. Helmet body is made double-layer. Inner layer has netted structure with cells and is removably connected with outer layer along line of joining. Multilayer removable fabric filter is mounted between body layers. Filter is made from material providing for aerosol and gas protection. Outer layer of helmet body is made monolithic and is provided with ridges, which together with filter define gas ducts. Helmet body is connected with corrugated air hoses and semimask through fastening branch pipes. Semimask has breathing and breathing out valves. EFFECT: reduced sizes and weight, increased efficiency and reduced breath resistance. 2 cl, 2 dwg