LOCKDOWN CYLINDER LOCKS

摘要

An exemplary lock cylinder includes a shell, a plug positioned in the shell, and a locking assembly. The locking assembly is configured to prevent rotation of the plug when no key is inserted, and to permit rotation of the plug upon insertion of any of a plurality of keys having different bitting profiles. The locking assembly may further be configured to prevent key extraction when the plug is in a rotated position.

主权项

1. A lock cylinder, comprising:
a shell including a generally cylindrical chamber and an opening; a plug disposed within the chamber, the plug including a keyway configured to receive a key, and a pocket connected to the keyway, wherein in a home position of the plug, the pocket is aligned with the opening and a shear line is defined between the pocket and the opening, and in a rotated position of the plug, the pocket is not aligned with the opening; and a locking assembly positioned at least partially within the pocket, operable in a blocking state wherein a contiguous portion of the locking assembly crosses the shear line and rotation of the plug is prevented, and an unblocking state wherein no contiguous portion of the locking assembly crosses the shear line and rotation of the plug is permitted; wherein the key comprises a plurality of bitting positions and a bitting profile selected from a predetermined set of possible bitting profiles, each of the possible bitting profiles defined at least in part by a unique combination of bitting position root depths, each of the bitting position root depths selected from a predetermined set of possible root depths; and wherein each of the possible bitting profiles is operable to transition the locking assembly from the blocking state to the unblocking state.