| 摘要 |
A high security barrel lock and a high security key with a movable external sleeve for maintaining the lock in an unlocked position. The lock has a cylindrical barrel with an axial bore. A hollow plunger and a center pin with an enlarged head are axially mounted in the bore. A pair of locking balls are constrained for limited movement between locked and unlocked positions in radial passageways formed in the barrel. The sleeve is fitted over the barrel and is constrained for movement between a locking ball holding position and a locking ball releasing position. In the holding position, the sleeve holds the locking balls in their unlocked position and, in the releasing position, the locking balls are released by the sleeve and free to move radially outward in the barrel passageways into their locked position. Thus, the installer does not require a key in order to install the lock.
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