Abstract: A key (1) for a rotary cylinder lock (2) comprises a key grip (3) and a key shank (4), which adjoins the key grip (3) and extends along a longitudinal axis (L), wherein the key shank (4) has, on its outside (5), control recesses (10), in particular control bores, for properly positioning tumblers on the rotary cylinder lock (2) and also has at least one control element (6) arranged in a movable manner in the key shank (4), which control element (6) has a control surface (8), which interacts with a tumbler (7) of the rotary cylinder lock (2). Furthermore, the key is characterized in that the key shank (4), in the region of the control element (6), has a tapered cross section (9), which is tapered in relation to the cross section (11) with the control recesses (10).

Abstract: A key (1) for a rotary cylinder lock (2) comprises a key grip (3) and a key shank (4), which adjoins the key grip (3) and extends along a longitudinal axis (L), wherein the key shank (4) has, on its outside (5), control recesses (10), in particular control bores, for properly positioning tumblers on the rotary cylinder lock (2) and also has at least one control element (6) arranged in a movable manner in the key shank (4), which control element (6) has a control surface (8), which interacts with a tumbler (7) of the rotary cylinder lock (2). Furthermore, the key is characterized in that the key shank (4), in the region of the control element (6), has a tapered cross section (9), which is tapered in relation to the cross section (11) with the control recesses (10).

Abstract: The mechatronic locking apparatus comprises a control circuit (4), from which information signals can be transmitted to a control circuit (6) of the lock cylinder (2) using a first communication path (5). A security key (3) has at least one second communication path (7) for storing and/or processing access data. The two communication paths (5, 7) are connected to said control circuit (4) of the security key (3). The first communication path (5) preferably uses an electrical contact in the lock cylinder (2). The second communication path (7) comprises a transponder (8). The first communication path (5) may also be used for power supply purposes.

Abstract: The mechatronic locking apparatus comprises a control circuit (4), from which information signals can be transmitted to a control circuit (6) of the lock cylinder (2) using a first communication path (5). A security key (3) has at least one second communication path (7) for storing and/or processing access data. The two communication paths (5, 7) are connected to said control circuit (4) of the security key (3). The first communication path (5) preferably uses an electrical contact in the lock cylinder (2). The second communication path (7) comprises a transponder (8). The first communication path (5) may also be used for power supply purposes.