| 摘要 |
<p>The usual pin tumbler lock core is provided with an additional set of security disc tumblers adapted to engage contours on the bottom rail of a key and in so doing the security tumblers are rotated as the key is inserted in the lock so that when the key is fully inserted, gates on the security tumblers all align to permit the inward movement of a side bar. The invention also envisions the key which is an otherwise conventional key having a bevelled tip and a security contour on a lateral surface for activation of the security tumblers of the lock of the invention.</p> |
