Abstract

A method and apparatus for extending an existing simplex or multiplex lock-and-key system that includes a family of first keys each having a first profile and of a corresponding plurality of first locks each operable by a first key and each having a first keyway configured for accepting the first key profile. Second keys of a new family are defined with a core section corresponding to the first key profile and a narrowed projection extending from the bottom of the core section. Corresponding second locks have a second keyway profile defined as the compliment of the second key profile, thus including a complimentary core section and a foot recess extending from the bottom of the second keyway core section. The second locks accept a second key positioned at the second keyway baseline to normally lift the lock pin stacks and operate the second lock. The second locks also accept the first keys but the first keys cannot enter the narrowed foot recess of the second keyway and are accordingly elevated in the second keyway above the keyway baseline, and are therefore unable to normally lift the lock pin stacks to operate the second lock.

IPC Classes  ?

• E05B 35/08 - Locks for use with special keys or a plurality of keys operable by a plurality of keys
• E05B 35/10 - Locks for use with special keys or a plurality of keys operable by a plurality of keys with master and pass keys
• E05B 35/12 - Locks for use with special keys or a plurality of keys operable by a plurality of keys requiring the use of two keys, e.g. safe-deposit locks
• E05B 19/06 - Key bitsFlat key bits

Abstract

A method and system for securing keys in which all key blanks are assigned a unique serial number and access to uncut key blanks is restricted to authorized distributors and keycutters, through whom the current location of uncut serialized key blanks is tracked in a remotely accessible database to whom only authorized individuals have access. The database stores the access code of all uncut serialized key blanks and, when a key is cut from a serialized key, an access code is associated in the database with the cut serialized key. Duplicate copies of serialized keys can be created only upon presentation of the serialized key and the access code associated in the database with the serialized key in response to verification of the association by the database. No identifying information relating to the location of a lock operable by a particular serialized key or to an owner of the serialized key is associated in the database with the serialized key.

IPC Classes  ?

• G06F 7/00 - Methods or arrangements for processing data by operating upon the order or content of the data handled