FORTIFICATION ENTRANCE Russian patent published in 1995 - IPC

FIELD: military fortifications, mainly skeleton-fabric ones; it can also be used for equipment of hermetically sealed entrance apertures in partitions separating rooms with different levers of contaminations. SUBSTANCE: fortification entrance uses a skeleton frame made in the form of two supporting rings furnished with eyes and interconnected by braces, covering shell positioned outside the skeleton frame, and a protective device made as a flexible shell positioned inside the skeleton frame; rotating rings furnished with handles-catches are rigidly secured to the ends of the flexible shell. The skeleton frame supporting rings are positioned between the protective device turning rings; the turning rings coaxially rest on the supporting rings and are connected with them by means of handles- catches and eyes. EFFECT: enhanced reliability. 2 dwg