An installation body for door and/or window handles is composed of a base body that has at least two passage holes for the insertion of fastening screws and a recess providing a receptacle for a detent ring. The base body is made up of a top side and a bottom side. The installation body is equipped with a covering element that is rotatably mounted on the top side of the base body and covers the latter in the first rotary position relative to the base body and allows access to the passage holes in the second rotary position relative to the base To meet aesthetic requirements and prevent visibility of parts of the subconstruction, the bottom side of the base plate is equipped with a lower covering. The covering element and the lower covering part fully surround the base body in the first rotary position of the covering element.

A digital door lock, and more particularly, an interface module device of a digital door lock is provided, which is capable of adjusting and aligning a position of a fastening bolt of the digital door lock so as to match fastening positions of a variety of locking devices while using a previously-installed locking device as it is. Accordingly, an interface module device for a door lock is provided, which includes a bracket, an interface bracket fastened with the bracket, and an interval alignment disposed between the bracket and the interface bracket to adjust an interval between fastening nuts inserted into fastening holes of the locking device.

An exemplary lock includes an outer spindle, a center spindle, and a lock control assembly selectively coupling the outer and center spindles. In one embodiment, the lock control assembly includes a cam coupled to the center spindle, a locking bar slidingly coupled to the outer spindle, a cam follower positioned between the locking bar and the cam, and a biasing element urging the locking bar into engagement with the cam follower. Engagement between the cam and the cam follower may be configured to move the cam follower longitudinally in response to relative rotation between the cam and the cam follower.