Patent ID: 7222508

Claim:
A door lock operable to rotate a tailpiece between two positions including a locked position and an unlocked position, the door lock comprising: a housing suitable for secure attachment to a door and including an outer surface defining a cylinder, a cylinder body located at least partially within the housing and selectively rotatable with respect to the housing, a rotating member located at least partially within the cylinder body and selectively rotatable with respect to the cylinder body, the rotating member including a key receptacle, a tailpiece coupled to the rotating member and configured to selectively rotate with rotation of the rotating member, a turnpiece directly engaged with the rotating member and not directly engaged with the cylinder body, a first locking device that is mounted on the housing and completely within the cylinder defined by the outer surface and that prevents rotation of the cylinder body with respect to the housing in the absence of an appropriate electronic credential, and allows rotation of the cylinder body with respect to the housing upon the presentation of the appropriate electronic credential, a second locking device that prevents rotation of the rotating member with respect to the cylinder body in the absence of an appropriate key, and allows rotation of the rotating member with respect to the cylinder body upon the insertion of an appropriate key in the key receptacle, wherein when the appropriate key is inserted in the key receptacle and either the turnpiece or the key is turned, the tailpiece is rotated between the locked position and the unlocked position, and wherein upon the presentation of the appropriate electronic credential and in the absence of an appropriate key, when the turnpiece is rotated, causing the rotating member and the cylinder body to be rotated, the tailpiece is rotated between the locked position and the unlocked position.