Pin tumbler lock cylinder
AssigneeBenjamin D. Pollack
InventorJoseph M. Genakis
Life of this patent
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Abstract
A cylinder lock comprising a plug, with an eccentric face, a cylinder and an eccentric sleeve between the plug and cylinder. When a proper key is inserted and raises the pins to operating shear level the plug and sleeve can be turned as a unit on an axis to unlock or lock, but in the event there is a single pin restraining the rotary motion of the sleeve, only a limited plug motion is permitted as it is now in an eccentric relation with respect to the cylinder. Picking of the lock is prevented by dividing the sleeve into segments rotatable with respect to each other and providing each with circumferentially extending recesses in which tumbler pins can become ledged.
Claims15
A cylinder lock comprising:
- a lock housing defining a circularly cylindrical bore and a plurality of housing tumbler-ways;
- a circularly cylindrical sleeve means rotatably mounted in said bore and having a circularly cylindrical passage with a central axis eccentric to the axis of said bore, said sleeve means defining a plurality of sleeve tumbler-ways aligned with said housing tumbler-ways;
- a cylindrical plug rotatably mounted in said passage and defining a longitudinally extending keyway, said plug further defining a plurality of transversely extending plug tumbler-ways intersecting said keyway and aligned with said sleeve tumbler-ways;
- a plurality of stacked tumblers longitudinally movable within each set of said aligned housing, sleeve and plug tumbler-ways;
- bias means forcing said stacked tumblers toward said keyway;
- and
- coupling means substantially preventing rotation of said plug within said passage so as to limit lock opening movement of said plug to an orbital path about the axis of said bore.
A cylinder lock comprising:
- a lock housing defining a circularly cylindrical bore and a plurality of housing tumbler-ways;
- a circularly cylindrical sleeve means rotatably mounted in said bore and having a circularly cylindrical passage with a central axis eccentric to the axis of said bore, said sleeve means comprising a plurality of axially aligned sleeve segments rotatable with respect to each other, each of said segments defining at least one sleeve tumbler-way aligned with one of said housing tumbler-ways;
- a cylindrical plug rotatably mounted in said passage and defining a longitudinally extending keyway, said plug further defining a plurality of transversely extending plug tumbler-ways intersecting said keyway and aligned with said sleeve tumbler-ways;
- a plurality of stacked tumblers longitudinally movable within each set of said aligned housing, sleeve and plug tumbler-ways;
- and
- bias means forcing said stacked tumblers toward said keyway.
Dependencies are inferred from the claim text.