FIELD: construction.
SUBSTANCE: protective lock comprises a box with hinges, a rigid web mounted in box hinges with the possibility of rotation in the horizontal plane, a seal of elastic material arranged between the web and the face surface of the box, a mechanism of web rotation and a locking mechanism. The lock is also equipped with an additional seal made as a hollow ring with a source of compressed air. On an inner surface of the box there is a support platform. The additional seal is installed between the box and the web.
EFFECT: increased reliability of underground facility protection with simplification of lock design, provision of economic efficiency in process of manufacturing and operation of the lock.
2 cl, 5 dwg
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