Combination lock, has pressure plate, which is pressed down when incorrect number key is pressed, so that pins leaves valleys of movable plate to return the movable plate to its original position by restoring force of springs

摘要

The lock has blocking devices attached at a pressure plate (52), where each device has a pin engaging with two opposite troughs of a movable plate (22). Long and short pressure rods are provided for number keys of a master secret key. The plate (52) is pressed down, if a incorrect number key is pressed, so that the pins leave the troughs to return the plate (22) to its original position by the restoring force of springs.