This invention relates to an apparatus designed to prevent the unauthorized opening of conventional locks such as a cylinder lock. More specifically, the invention will prohibit one from attempting to pick a lock with a foreign device because even if the internal mechanism of the lock could be set, it will not rotate until access to the keyway is blocked. With such access blocked, the picking of the lock cannot be accomplished.
Conventional locks, such as the cylinder lock found on many vending machines, pay telephones, amusement devices and the like, are quite susceptible to being picked. Usually the internal mechanisms of these types of locks include a plurality of spring loaded tumblers which are properly set by the key designed therefor. Once set, of course, the lock can be rotated and the compartment under lock opened. With such a mechanism it is not too difficult to utilize a paper clip, hair pin or the like and maneuver the same until all the tumblers are set to thereby open the lock. Of course, such maneuvering requires continual access to the keyway.
To date no device of which I am aware utilizes a double lock system to prevent the rotation of the cylinder lock even after the lock is set, either by key or foreign device. The second lock, holding the cylinder lock and preventing rotation thereof, is released only after access to the keyway is blocked prohibiting one from maintaining the cylinder lock set with a foreign device.