초록 ▼

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 hu

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.

대표청구항 ▼

A cylinder lock having an outer knob structure adapted to function by key operation only and having a knob which functions as a handle only and not to retract the lock bolt, said lock having a chassis including an outer hub, a knob sleeve mounted coaxially in said hub, and a locking lug locking the

A cylinder lock having an outer knob structure adapted to function by key operation only and having a knob which functions as a handle only and not to retract the lock bolt, said lock having a chassis including an outer hub, a knob sleeve mounted coaxially in said hub, and a locking lug locking the sleeve against rotation relative to the hub, the outer end of the sleeve forming a core seat for the reception of a key-removable core having a central lobe containing a rotary key plug and having a laterally projecting pin tumbler housing, a roll-back cam carrier rotatably mounted in the knob sleeve, having a roll-back cam at its inner end for actuating a bolt retractor, and means for connecting the cam carrier for operation by the key plug of a core mounted in said core seat, wherein the improvement comprises a knob having a neck portion mounted for rotation on said hub and knob sleeve structure and having a hand-hold at its outer end formed with a large circular opening coaxial with the knob sleeve and adapted to pass the key-removable core to and from said core seat, and means for closing said circular knob opening and supporting the outer end of the knob from the knob sleeve, said means including a face plate in said knob opening and having an inner opening surrounding a portion of the core so as to expose the key plug thereof for key insertion, said closing and supporting means having a rotary slip fit at a peripheral face thereof which allows the knob to rotate freely under low turning force and thereby to render said lock immune to forcing by the application of high torque to said knob.