METHOD OF MANUFACTURE OF BREATHING APPARATUS HALF-MASK Russian patent published in 1997 - IPC

FIELD: equipment of individual protection of respiratory organs, in particular, manufacture of breathing apparatus half-masks. SUBSTANCE: the method consists in the fact that a flat blank in the form of a square with two opposite convex sides is cut out. Then folds in diagonals of smaller squares passing from the vertices of angles of the larger square inside the half-mask are formed. After that parts of the folds shape. A strip of filter medium is fastened around the edges of the half-mask. EFFECT: facilitated procedure. 4 dwg