The e-Framework for Education and Research: An Overview

The invention provides an improved key actuated lock of the type including a front plate having a keyhole; a bolt with two stumps and two sets of pivoted levers of different lengths for each set provided with stump-receiving slots so that the slots in each set can be aligned by a key to receive a respective stump. The improvement is that the levers and stumps are so arranged that the stump received in the shorter of the sets of levers is masked by the other set of levers when viewed from the front plate thereby making the lock more difficult to pick or drill open.