| 摘要 |
An improvement to Del Nin's security locking device outlined by U.S. Patent No. 5,983,680 issued Nov. 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 opening 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 and tear, with more sturdy bayonette latch mechanism resulting in solid precision control over deadbolt's vertical movement. |
