Key operated lock has three armed change lever with one arm having tangent surface to movement path to form pivoted wedge surface

摘要

The lock (16) has a cylinder lock controlling a bolt (16) and returnable tumbler (4). A three armed change lever (28) has a first arm connected to the bolt tail (18) and the second engaging a locking ward (23). The third arm (31) engages the tumbler tail. The flank (38) of the third arm has a tangent (T) in reference to the movement path (z) of the tumbler and the connection point (26) with the movement tangent (KT) form a pivoting wedge surface.