Title: Key controlled security apparatus

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Abstract: A security apparatus including a cylinder lock with an actuator plug rotatably mounted within a hollow cylindrical housing. Retained by the actuator plug are a plurality of locking wafers that are spring biased into a locking spline formed in the inner surface of the housing so as to retain the plug in a locked station. Also retained by the plug is a first directional wafer, spring biased into a quiescent position wherein it allows counterclockwise rotation of the plug from a locked station but prevents clockwise rotation thereof and movable into an active position wherein it allows either clockwise or counterclockwise rotation of the plug. A second directional wafer is spring biased in a primary position wherein it permits both clockwise and counterclockwise rotation of the plug from the locked station and movable into an intermediate position wherein it allows clockwise rotation but prevents counterclockwise rotation of the plug. A first control key is bitted so as to pull the locking wafers to shear positions out of the locking spline while leaving the first and second directional wafers in their quiescent and primary positions, respectively. A second control key is bitted so as to pull the locking wafers into shear positions and draw the first and second directional wafers into their active and intermediate positions, respectively. Finally, a master key is bitted so as to draw the locking wafers into shear positions, pull the first directional wafer into its active position and leave the second directional wafer in its primary position.


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