Patent ID: 8141399

Claim:
A rotatable lock barrel, comprising: an elongated, generally cylindrically shaped barrel member having an exterior configured for receipt in a bore of a lock cylinder and an interior containing a locking member, said barrel member having a recess formed therein; a detent borne by said barrel member, that travels along a plane that extends approximately radially relative to said barrel member; and said locking member being disposed in the recess of the barrel member and being substantially entirely contained within the barrel member, said locking member being movable; said recess in said barrel member being configured to receive at least a portion of said detent to permit said detent to move into and out of engagement with a recess in the lock cylinder while selectively permitting and blocking rotation of said barrel member with respect to the lock cylinder; and an electronically powered drive mechanism located within and borne by the barrel member, said drive mechanism being disposed to move the locking member to a first position where said drive mechanism limits movement of said detent and alternately to a second position where said drive mechanism permits movement of said detent.