FIELD: protection against unauthorized access. SUBSTANCE: device for safeguarding key holes has cylindrical body with internal guide opening for a key. A diaphragm is secured to the body and made in the form of a cylinder installed in the cover between external input hole and internal output hole and may be rotated and stopped. The device is provided with spring loaded gates with lengthwise ledges installed in inclined divergent slots originated in the diaphragm and the body and may be moved axially and radially under action of the key. EFFECT: reliability. 7 dwg
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