An actuating device has an actuating member (2) pivotable in a first operating state about an axis (1). The actuating member (2) is connected in a torsion-proof manner with a toothed member (3). The toothed member (3), in a second operating state, prevents pivoting movement of the actuating member (2). The toothed member is coupled, in a lockable manner, with a detent member (4). The detent member 4 is movably mounted with respect to the axis (1).