| 摘要 |
An improvement to Del Nin s security locking device outlined by U.S Patent N o. 5,983,680 issued November 16, 1999 is described wherein the improvement comprises of new gearing arrangement and vertical deadbolt design so as to strengthen the device s vulnerability to forced breakage, and so that such locking device may operate on doors openin g from either left or right sides of its door frame. This improved vertical deadbolt design additionally replaces need for any spring-like mechanisms prone to attack and vulnerable to wear a nd tear, with more sturdy bayonette latch mechanism resulting in solid precision control over deadbolt s vertical movement.
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