Abstract: An locking assembly structured to removably and automatically secure an umbrella mast or other stanchion to a supporting base including a mounting structure secured to the base in interconnecting relation between the stanchion and the base. The locking assembly is connected to the mounting structure and includes a movable locking member positionable between a locked orientation and a released orientation. The locked and released orientations are respectively and at least partially defined by the locking member disposed into and out of interruptive engagement with a predetermined exterior surface portion of the stanchion on an interior of the mounting structure. Automatic disposition of the locking member between the released and locked orientations is facilitated by an end portion of the locking member configured and structured to both slidingly and interruptively engage the stanchion.