Medeco Security Locks, Inc.

Andy E Perkins

Peter H Field

Glenn K Hartman

Mark Benzie

Thomas Edwin Duckwall

Clyde T Roberson

W Daniel Boadwine

Anthony Hicks

Kevin Lee

Glenn Hartman

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.

Key blank, key and master keying system

A twisting tumbler lock with a side bar is provided with additional levels of security by a axially reciprocable slider which is normally positioned to block operation of the side bar but is moved by a specially configured key to free operation of the side bar. This provides a third level of locking security, it also allows master keying. The unique key has a portion of a rib formed to cooperate with the slider to further allow key control.

Rotating pin tumbler side bar lock with side bar control

Growing community of inventors

Lafayette, VA, United States of America

Andy E Perkins