DETACHABLE CODED DEVICE FOR PROTECTION OF KEYHOLES Russian patent published in 2009 - IPC E05B17/18 

FIELD: mechanics.

SUBSTANCE: invention relates to facilities for door locking. Detachable coded device for protection of keyholes contains fixed on door co-axial to keyhole annular body, which is outfitted by end wall with ellipsoid central opening, and blind flange, which includes cylindrical body with hollow center, outfitted by external and internal end covers, between which co-axial on cylindrical body there are located tilting yokes of coded device with dimples on internal cylindrical surface and adjusting notches on external cylindrical surface, and installed with ability of rotation axial bore of cylindrical body ladder-shaped roller, at the end of which it is implemented T-shaped ellipsoid tail, entering into ellipsoid central opening of end wall of annular body. In plane of each becket on external surface of cylindrical body there are implemented sockets, in which there are installed spring-load balls, and radial channel, in which it is located spring-loaded detent with globular face, directed into the side of roller, and projection on the opposite butt, directed to the side of beckets. On external surface of roller there are implemented dimples for globular face of spring-loaded detent. One of dimples on inner surface of each fixture is implemented with groove for projection of spring-loaded detent. On inner end cover of cylindrical body there are implemented digital flanges, coming into corresponding openings on butt wall, which exclude turning of cylindrical body relative to annular body.

EFFECT: invention provides improved reliability of keyholes protection against unblanking by outsiders.

3 cl, 5 dwg