E - Fixed Constructions – 05 – B
Patent
E - Fixed Constructions
05
B
E05B 35/12 (2006.01)
Patent
CA 2179675
A hierarchical system of locks and keys with at least two distinct key slot configurations and at least two distinct key blanks, each key blank being configured to enter only one of the first or second key slots. The key slots include an upper portion and a lower portion, and the lower portion extends away from the upper portion at a predetermined angle. The angles are different for each key slot and are selected so that the lower portions of the two distinct key slot configurations overlap, i.e., the upper portions thereof may be aligned such that the lower portions, which extend therefrom at different angles, define a common area of overlap. The overlap area defines the configuration of a corresponding third key which will enter each of the other two key slots (and thus be a master key with respect to the first and second key slots). In addition, the overlap area defines a third key slot configuration which may be used in an additional lock and will receive the third key blank but not the first and second key blanks. This feature permits limiting the access of certain keys within one hierarchical system while increasing masterkeying capabilities beyond those of the prior art.
Medeco Security Locks Inc.
Ridout & Maybee Llp
LandOfFree
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