초록 ▼

In a removable core-type lock, the internal tumbler pin mechanism is modified to incorporate an antipick jamming action that is actuated whenever an attempt is made to pick the tumbler pins. The jamming action comprises a pair of security tumbler pin assemblies that cooperate with the lock\s cylindr

In a removable core-type lock, the internal tumbler pin mechanism is modified to incorporate an antipick jamming action that is actuated whenever an attempt is made to pick the tumbler pins. The jamming action comprises a pair of security tumbler pin assemblies that cooperate with the lock\s cylindrical plug which incorporates the lock\s keyway and serves as the primary locking element, and with a modified control sleeve structure which forms part of the jamming action and serves as a control means for releasably retaining the core in the lock\s casing. In reaction to tampering of the lock by an attempt to pick the tumbler pins, one of the security pins is forced to a position that locks the control sleeve structure and plug together in a manner that prevents the opening of the lock or the removal of the core from the lock casing by means other than the use of a properly notched primary or control key.

대표청구항 ▼

In a lock of the type having a casing and a core housing that houses a locking mechanism and that is releasably retained within the casing, and wherein the locking mechanism includes a cylindrical locking/unlocking plug defining a keyway and includes a core retaining control sleeve rotatably fitted

In a lock of the type having a casing and a core housing that houses a locking mechanism and that is releasably retained within the casing, and wherein the locking mechanism includes a cylindrical locking/unlocking plug defining a keyway and includes a core retaining control sleeve rotatably fitted on the plug and disposed therewith in the core housing, and a row of transversely oriented tumbler bores and associated primary/control tumbler assemblies so constructed and arranged in the core housing, sleeve and plug so that the tumbler assemblies have true primary and control breakpoints which respectively enable a primary key to rotate the plug relative to the control sleeve and core for unlocking the lock, and enable a control key to rotate the plug and control sleeve relative to the core housing for releasing the core housing from the casing, wherein the lock incorporates the improvement of an antipick jamming action that comprises: said sleeve being transversely divided into first and second sleeve segments that are arranged for independent limited angular rotation relative to said core housing, said true primary/control breakpoints in said tumbler assemblies being disposed to that the primary key causes said plug to rotate relative to both said first and said second sleeve segments, and so that the control key causes said plug to rotate relative to said first segment and causes said second segment to rotate jointly with said plug relative to said core housing to release said core housing from said casing; at least a first security tumbler bore formed in said core housing so as to intersect with said first sleeve segment, and a security tumbler bore formed in said first sleeve segment so as to extend between said core housing and plug, and a security tumbler bore formed in said plug so as to extend from said first sleeve segment inwardly into said plug, said security bores in said plug and first sleeve segment being normally aligned with each other and circumferentially offset from said first security tumbler bore in said core housing and being movable into alignment with said first security tumbler bore in said core housing when said first sleeve segment and said plug are caused to rotate relative to said core housing due to picking of breakpoints on said primary/control tumbler assemblies; and at least a first security tumbler means mounted in said first security tumbler bore of said core housing for causing said first sleeve segment and said plug to be jammed together so as to prevent relative rotation therebetween when said security tumbler bores in said plug and first sleeve segment become aligned with said first security tumbler bore in said core housing such that said plug cannot be rotated sufficiently relative to said core housing to open the lock because said plug is constrained to the limited angular rotation of said first sleeve segment.