Abstract: A cylindrical lock structure having a key-removable core in its outer knob, modified to provide a function as for hotel room use in which it is operable from the outside by key operation only and the outside knob sleeve or spindle is locked against bolt-retracting rotation relative to the chassis hub, is rendered immune to forcing from the application of excess torque to the outer knob, by mounting the knob neck rotatably on the knob sleeve and hub structure and by providing a rotative slip fit at the periphery of the face plate which closes the core-passing opening at the outer end ot the knob handle and supports such end from the knob sleeve, so as to allow the knob to rotate freely on the non-rotative knob sleeve and hub, and thereby prevent the application of excess torque to the locked knob sleeve.

Abstract: Apparatus for providing a "hotel function" in a cylinder lock having a key-removable locking core in its outside knob. Actuation of a push button in the inside knob causes the core to be disabled from retracting the bolt and projects an indicator from the face of the outside knob. The key plug of the core is connected to rotate a throw member which is axially movable between an inward operative position and an outward disabling position. The throw member is connected to the roll-back cam by a flat blade slidable in a cross slot in the roll-back cam sleeve. In the operative position of the throw member, a full width section of the blade lies in the cross slot to clutch the blade to the roll-back cam, while in the disabling position, a narrowed section of the blade lies in the cross slot and is rotatable therein so as to declutch the blade from the roll-back cam.