MECHANICAL CODED LOCK Russian patent published in 2006 - IPC E05B37/04 

FIELD: locks, particularly blocking devices for movable members, namely doors.

SUBSTANCE: lock comprises body, bolt, cross-bar with latch, code system with drive and transmission members. Locking discs and fixing unit are arranged on common axis. Each disc has orifice for transmission member receiving and groove for fixing unit receiving formed along disc generatrix. Lock is provided with clearing device, which erases the last code digit, pivoted additional locking discs, distance rings and safety unit. The safety unit consists of holder, cam with rod and arm. The body is made as bush with flange, has longitudinal groove and is provided with bolt arranged in the bush. The bolt is made as hollow cylindrical member with stepped cross-section and cantilever. Longitudinal through cut is made in cylindrical member wall. The bolt is provided with fastening unit, which connects the bolt with the body. The unit is formed as arm with toothed crown arranged on cantilever. Axis with locking discs is fixedly secured in the bolt and is made as hollow member with longitudinal groove. Fixing unit is formed as spring-loaded cylindrical finger. Distant rings are installed on the axis between locking discs and may perform longitudinal movement along the axis without rotation thereof. The drive is made as coded arm connected to bolt by spherical members, which may rotate and move in axial direction. The arm has pusher secured in the arm and arranged in the axis, as well as joint pins to connect coded arm with lock when true code is input. Cross bar with latch is formed as clamp with cylindrical members and may be moved in the cantilever of safety unit. The clamp is connected with the cam, which in turns is secured with toothed crown secured to arm. The clearing device is secured to pusher end.

EFFECT: improved secrecy, reliability and operational convenience.

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