Patent ID: 8661865

Claim:
A system, comprising: a programmable cylinder lock; a use key; and a change key, wherein the programmable cylinder lock comprises a stator ( 1 ), and a cylindrical rotor ( 2 ) mounted inside the stator ( 1 ) for rotation around its own axis and having a keyhole extending in a direction of the axis for insertion of a key, and comprising inside the cylindrical rotor ( 2 ) a plurality of key followers ( 4 ) movable along longitudinal and transversal directions, adapted to cooperate with codification conformations of a key inserted into the keyhole of the cylindrical rotor ( 2 ), and a plurality of locking pins ( 6 ), movable along the longitudinal direction, forming lock blocking members, said key followers ( 4 ) and locking pins ( 6 ) forming together a plurality of pairs each including a locking pin ( 6 ) and a key follower ( 4 ) and having toothings adapted to mutually cooperate, in different relative positions, to define a lock codification, the cylindrical rotor ( 2 ) comprising a transversally displaceable stop bar ( 9 ) that cooperates with a longitudinal groove ( 10 ) of the stator ( 1 ) and that cooperates with the locking pins ( 6 ) in order to immobilize said locking pins ( 6 ) when the cylindrical rotor ( 2 ) is made to rotate within the stator ( 1 ) and the stop bar ( 9 ) comes out of said groove ( 10 ) and engages the locking pins ( 6 ), and comprising a change bar ( 11 ) which is transversally displaceable and is slidingly coupled with the key followers ( 4 ) in order to normally engage the key followers ( 4 ) with the locking pins ( 6 ), and to disengage the key followers ( 4 ) from the locking pins ( 6 ) when said change bar ( 11 ) comes into said groove ( 10 ) of the stator ( 1 ) and provides a lock programming position, wherein said stop bar ( 9 ) has at least one protrusion ( 12 ) facing the keyhole of said cylindrical rotor ( 2 ), and wherein the use key ( 13 ) has at least one recess ( 14 ) that faces said protrusion ( 12 ) of the stop bar ( 9 ) when the use key ( 13 ) is correctly inserted in the keyhole of the cylinder lock, whereas the change key ( 15 ) corresponding to the use key ( 13 ) has a longitudinal groove ( 16 ) extending in a position corresponding to said at least one recess ( 14 ) of the use key ( 13 ).