SECRET BLOCK OF FOR BIT-KEY LOCK Russian patent published in 2008 - IPC E05B25/02 

FIELD: construction.

SUBSTANCE: secret block contains side plates of a bar with hollows for interaction with the bits of a key and a hole for the locking poll and placed between them on the guiding polls a set of flexible half-bit-keys with an individual code perforation, a hole for interaction with the bits of a key and locking tabs for interaction with the locking poll. The locking tabs are arranged at the opposite peripheral edges of each half-bit-key, code perforations and holes for interaction with the bits of a key are situated in the window of the central part of half-bit-keys. The gutters for the guiding polls are situated diagonally in the angles of the half-bit-keys field. The set of half-bit-keys is sprung by the general flat spring of a spring type which ends rest on its own half-set of half-bit-keys. At the side plates of the bar there is an additional hole for the second locking poll and above it there is rectangular hole for the flat spring. Holes for the interaction with the bits of a key are made in the middle part of the side plates and are connected with the respective holes and code perforations of the half-bit-keys. The half-bit-keys in the set are arranged one on another with the reverse side with the turn around their both vertical and horizontal axes.

EFFECT: increase of productivity and decrease of the production net cost of the item by decreasing a number of stamps for half-bit-keys preparation down to two and a number of springs in the construction down to one.

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