Abstract: A lock of the disconnectable rotor type comprises a rotor rotatable in a stator sleeve rotatable in a fixed lock case. Locking means (e.g. pairs of pins or pallets) cooperate with rotor and stator sleeve to couple them together for simultaneous rotation in the absence of a correct key while freeing the rotor from the stator sleeve when the correct key is introduced. The stator sleeve is maintained in a normal or "rest" position by an effaceable indexing member. The indexing member cooperates with the lock case to maintain the stator sleeve in its said position. A lock bolt actuating lever is coupled to the rotor by coupling means such as to effect this coupling only after rotation of the rotor independently of the stator sleeve. The coupling means include a slide ring rotatable with the rotor, cooperating with the stator sleeve through camming means to slide the slide ring axially, and including at least one actuating finger.