Lock assembly with locking bar

摘要

A lock assembly includes a cylindrical key plug with a key slot and a shell surrounding the plug. A first locking mechanism is provided by split top pins projecting across the shear surface interface between the plug and the shell and are positioned to align the split with the shear surface by notches of varying height located along the top of a key. Second and preferably third locking mechanisms are also located in the plug and include a locking bar that projects into a locking groove in the shell when in the locked position. The locking bar has an offset ridge along an upper edge that prevents the locking bar from moving to an unlocked position unless side pins having recesses adapted to receive the ridge are properly positioned by depressions of the correct depth along the side of the key to align the recesses with the ridge. The lock can be easily rekeyed by simply reversing the locking bar.