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AssigneeMedeco Security Locks, Inc.
InventorsPeter H. Field, Andy E. Perkins, Anthony Hicks, Mark Benzie, Glenn Hartman, Clyde Roberson, Thomas Duckwall, Kevin Lee, W. Daniel Boadwine
Estimating the term…
A key blank, key and master keying system for a twisting tumbler sidebar lock of the type where the sidebar is blocked or unblocked by a selectively positioned longitudinally extending slider, has a key blank with a slider contacting surface on a rib on the blank below the bitting area at one of a plurality of selected predetermined locations. A key with skew cut bittings can be cut on the blank and the blank can be configured with the slider contacting surface at different predetermined locations. The slider contact area on the rib of the key blank can be divided into two horizontal portions at different predetermined locations and the slider itself can have contact surfaces also positioned at different predetermined locations so that a number of different master keying variations are possible.
A key blank for use in cutting a key which key is for a twisting tumbler/sidebar type lock having a slider for blocking or allowing operation of the sidebar, the key blank comprising:
A key for use in a lock having twisting tumblers operated by skew cut bittings on the key, a sidebar and a locking slider for selectively blocking or allowing operation of the sidebar, the key comprising:
A master keying system for us with a twisting tumbler sidebar lock having a locking slider, a key comprising a key blade having skew cut bittings extending vertically alone a longitudinally-extending top edge, and a slider contact area being divided horizontally into two portions and positioned at different predetermined locations and the locking slider having contact surfaces positioned at different predetermined locations so that a plurality of master keying variations are produced.
Dependencies are inferred from the claim text.