Patent ID: 8132436

Claim:
A locking device comprising: a frame having an opening; a plug that may be placed in the frame, in a closed position of the plug, closing the opening in the frame, and removed from the frame to an opening position of the plug; a keeper mounted on the frame; a wrench including means for storing an identification code of the wrench; a lock having a bolt mounted on the plug, the plug having an opening providing access to the lock by the wrench so the wrench can move the lock from a locking position, in which the bolt is captured by the keeper, to an unlocking position, in which the bolt is disengaged from the keeper; code reading means integrated into the plug for reading the identification code when the wrench is introduced into the opening of the plug; an electronic module integrated into the plug and storing a code for comparison to the identification code read by the code reading means; and a movable obstructing component that is movable with respect to the plug and that is located in the opening of the plug, wherein the obstructing component, in an obstructing position, blocks passage of the wrench for operation of the lock by the wrench, and in an unobstructing position, allows the wrench to be positioned for operating the lock when the identification code of the wrench read by the code reading means agrees with the identification code stored in the electronic module.