Anti-theft product tag with ball clutch

Abstract

An article surveillance includes a pair of components that are detachably connected together having a releasably grasping device engaging with an article intended to be protected. The device is coupled between the two components with a selected one of the components having an elongated prong insertably received within the other component and is held thereto by a ball clutch mechanism. The mechanism includes a tapered housing with an internal tapered wall surface enclosing a plug member having at least two balls carried in opposing grooves. The tapered housing and the plug member include a coaxial passageway for insertably receiving the elongated prong from the first component. The plug member is resiliently biased to a first position by an expansion spring causing the balls to bear against the tapered inner wall of the housing, restricting the passageway. When the prong of the first component is occupying the passageway, the sides of the prong force the balls outwardly as the plug member moves to compress the spring. The widened mouth of the housing permits the balls to expand or separate and does not place any restriction on the pin. Should the first component with the pin be withdrawn by unauthorized personnel, the plug member will be pushed into the tapered recess of the housing by expansion of the spring and the balls will contract and restrict the shaft or pin member of the first component, so as to hold the component together.