| 摘要 |
<p>An axial tumbler lock assembly having a three-part cylinder arrangement including a fixed rear part, a rotatable front part, and a rotatable intermediate part, the three parts establishing between them two interfacial planes. Three-piece split tumbler arrangements are slidable in aligned bores in the cylinder parts and normally project across both interfacial planes to thus prevent relative turning of either rotatable cylinder part with respect to the fixed cylinder part. A reset key is provided for releasing the front cylinder part from the intermediate cylinder part without releasing the intermediate cylinder part, thus effecting a new alignment of tumbler pieces and a combination change so that a different operating key is required for each combination change of which the lock is capable. The reset key is incapable of effecting unlocking operations.</p> |
