Master key lock, system and method
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United States of America Patent
Stats
-
Oct 2, 2012
Grant Date -
Aug 19, 2010
app pub date -
Feb 18, 2010
filing date -
Feb 18, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A master key lock includes a lock cylinder having a keyway for receiving a key, a sleeve about the cylinder, a plurality of wafer tumblers, a master key and a spring operable to axially move the sleeve relative to the cylinder when the master key is inserted into the keyway. A system that uses the master key lock includes a lock case wherein the sleeve is disposed between the cylinder and the lock case, the sleeve being axially movable within the case. The sleeve comprises a plurality of transversely disposed slots for engaging the plurality of wafer tumblers such that the lock is unlocked by insertion of a key or a master key. A method of using the master key lock is also disclosed.
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