| 摘要 |
<p>An axial split-pin tumbler-type lock mechanism includes a rotatable operating part and a stationary part, which adjoin at an interfacial plane. Tumblers each including a drive element and a follower element are mounted in bores in the parts which meet in alignment at the interfacial plane, and the tumblers are movable back and forth in the bores. When the joints between the tumbler elements coincide with the interfacial plane upon insertion of a key, the operating part may be rotated by means of the key, to accomplish desired function. The lock mechanism is provided with structure making it resistant to picking, including ledge means on the operating part adjacent to at least one bore of a pair of aligned bores, and rib means on the follower element of the tumbler movable in such pair of aligned bores and adapted to overlappingly engage the ledge means when picking torque is applied to the operating part and while the tumbler joint is displaced from the interfacial plane, for preventing longitudinal movement of the follower element in the direction of the interfacial plane.</p> |
