Lock structure with a warning device

A lock structure comprising a lock housing (4), a hollow lock cylinder mounted in said housing;

• a rotary plug member within said cylinder, said plug member having an axial keyhole slot therein;
• a plural number of aligned lock actuator tumblers extending within the plug member and the cylinder whereby insertion of a properly configured key into the keyhole slot causes the plug member tumblers to push the cylinder tumblers outwardly to positions wherein the plug member can be rotated;
• lock bolt means movable between a locking position and an unlocking position;
• means (2) for coupling the plug member to the lock bolt means, whereby rotation of the plug member moves the lock bolt means to its unlocking position;
• aligned false tumblers (111,110) extending within the plug member and the cylinder, whereby insertion of an improperly configured key into the keyhole slot causes the false tumblers in the plug member to push the associated cylinder false tumblers outwardly to a position projecting from the cylinder;
• a warning switch means (702);
• and an actuator means (301) for said switch means;
• said actuator means being operatively connected to said false tumblers so that when a cylinder false tumbler is forced outwardly to a position projecting from the cylinder the actuator means is operated to actuate the warning switch means.