RIM CODED LOCK Russian patent published in 2006 - IPC E05B37/02 

FIELD: ironmongery, particularly locks for metal doors.

SUBSTANCE: coded lock comprises coded disc and locking disc control means located on face side thereof and adapted to provide coding mechanism flushing with door leaf. All hairlines and symbols are relocated from locking disc to preinstalled symbol disc formed as a cup with flange. The flange is provided with hairlines and signs embossed on it. The locking disc is made as a cup with end extension to provide radial movement thereof. Longitudinal groove and slot are relocated from stepped bush to aligning bush. Central pad located between the discs is made as a cup. Each outer coded disc is formed with drive piece bent through right angle to provide free rotation thereof in one of two annular channels. Coded discs are pressed by nut having hairlines embossed on outer peripheral surface thereof. During lock closing the nut is automatically blocked with locking pin. Door handle is connected to stop means, which transmits rotation to blocking mechanism. Axial stop means displacement is limited by screw, which retains coded mechanism in the door from connected side thereof through mounting bush on which locking lock mechanism is assembled. The mounting bush is screwed-on from inner door side.

EFFECT: increased secrecy, reliability, simplified locking, unlocking and code changing.

12 dwg