TAMPER-RESISTANT LOCK Russian patent published in 2012 - IPC E05B21/00 

FIELD: construction.

SUBSTANCE: lock comprises a boxy casing, figure plates equipped with an appropriate part, which is suitable for detachable engagement with an appropriate section of a rack, which may carry out reciprocal motion and carries at least one bolt on its free end, besides, plates may execute vertical reciprocal motion by action of a key, at the same time at least one of the plates comprises at least one section equipped with at least one seat, which is aligned relative to at least one nearest ledge, besides, at least one plate equipped with at least one seat may oscillate around a guide finger rigidly joined with a boxy casing, for mutual engagement of at least one seat with an according at least one ledge, differing by the fact that it comprises elastic facilities arranged between a fixed stop and a section, which is located near the seat, for elastic feed of at least one plate into the second configuration for mutual separation and absence of interaction between the seat and the specified ledge. Elastic facilities are formed with an axial spring, which is installed inside an element, which is rigidly joined with a boxy casing, besides, the end of the spring that rests against the section is located near the seat of at least one plate, besides, the element rigidly connected with the boxy casing suitable for location of an axial spring also comprises a ledge.

EFFECT: higher resistance to tampering.

4 cl, 4 dwg