Abstract: A locking system for locking a closure element, more particularly a door, having a main body, which rotatably receives an actuation element, for arrangement on one side of the closure element and having a locking module for arrangement on the opposite side of the closure element. The actuation element has an interface for connection to the locking module. The main body has a fixed interface for connection to the locking module; and depending on the type of locking module, same can only be connected to the co-rotating interface or to both interfaces. The disclosure also relates to a closure element having such a locking system, and a method for assembling a locking system.

Abstract: A casement lock (1) includes an actuation lug (2); a locking shaft (3) coupled to the actuation lug (2) and having two opposite flattened axial regions (5) at a free end (4) of the locking shaft and a circumferential profiling (6) between the flattened axial regions (5); and a cage (8) supporting a closure element (7) configured to be placed with an opening (9) on the free end (4) of the locking shaft (3) and fixed to the locking shaft (3). A locking element (14) is provided on the cage (8), which, in a locking position, secures the cage (8) on the locking shaft (3) against tilting. In a release position of the locking element (14), the cage (8) can be tilted relative to the locking shaft (3) and is moveable in an axial direction along the locking shaft (3) only in a state when tilted relative to the locking shaft (3).

Abstract: A casement lock (1) includes an actuation lug (2); a locking shaft (3) coupled to the actuation lug (2) and having two opposite flattened axial regions (5) at a free end (4) of the locking shaft and a circumferential profiling (6) between the flattened axial regions (5); and a cage (8) supporting a closure element (7) configured to be placed with an opening (9) on the free end (4) of the locking shaft (3) and fixed to the locking shaft (3). A locking element (14) is provided on the cage (8), which, in a locking position, secures the cage (8) on the locking shaft (3) against tilting. In a release position of the locking element (14), the cage (8) can be tilted relative to the locking shaft (3) and is moveable in an axial direction along the locking shaft (3) only in a state when tilted relative to the locking shaft (3).