| 摘要 |
A keyhole barrier system for use with tumbler locks containing a keyway and a plurality of tumblers. The system contains a keyhole block having both retention and signaling portions. The retention portion prevents removal of the keyhole block from the lock by providing a locking surface for the lock tumblers. The signaling portion extends outwardly from the keyway preferably substantially parallel to the retention portion. The system can further include an extractor having both insertion and handle portions. The extractor facilitates removal of the installed keyhole block by raising the tumblers locked against the keyhole block. Further, the handle portion and the signaling portion can form a retraction aid to facilitate removal of the system from a keyway. A method for forming a keyhole barrier system for use in tumbler locks includes providing a keyhole block having a laterally visible signaling portion and a retention portion in which the retention portion comprises an elongated portion, a locking surface and a tip. The method also includes inserting the keyhole block into the tumbler lock and allowing at least one pin from the lock to drop behind the locking surface. The lock cannot be operated by a conventional key with the keyhole block installed.
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