Locks – Operating mechanism – Key
Patent
1978-06-27
1979-09-25
Wolfe, Robert L.
Locks
Operating mechanism
Key
70409, 70411, E05B 1904
Patent
active
041686179
ABSTRACT:
A lock system has a master-only lock which can be opened only by a master key and a subordinate lock which can be opened by a subordinate key and a master key. The master-key slot of the master-only lock is formed with a plurality of parallel longitudinally extending and inwardly projecting guide ridges and a plurality of parallel longitudinally extending and inwardly open variable recesses interleaved with and parallel to the guide ridges. The master key is complementarily shaped. The subordinate lock has guide ridges and variable recesses identical to that of the master-only lock, and in addition is formed with further variable recesses in which fit corresponding further ridges on the subordinate key. Thus, the subordinate key is of larger cross-sectional area than the master key so that it cannot fit into the master lock. The various guide ridges provided in all the locks and variable recesses which change from lock to lock are interleaved with each other to discourage machining of a subordinate key down into a master key.
REFERENCES:
patent: 3499304 (1970-03-01), Naujoks
EVVA-Werk Spezialerzeugung von Zylinder- und Sicherheitsschlosse
Striker Michael J.
Wolfe Robert L.
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