Resealable closure device

A plastic closure assembly for a can top comprising

• a plastic insert to be installed in the can top and defining a pouring aperture;
• and
• a closure element fitting in a sealing manner in said aperture, said closure element having
• a cylindrical plug element extending into the pouring aperture, a plurality of angularly spaced apart dogs projecting radially outwardly from said plug element, each of said dogs having a bearing surface substantially perpendicular to said plug element,
• said plastic insert having a cylindrical wall portion extending into the can to receive the plug element,
• a plurality of angularly spaced dogs projecting radially inwardly from said wall portion,
• each of said dogs having a bearing surface substantially perpendicular to said plug element,
• the respective bearing surfaces on said plastic insert and the respective bearing surfaces on said plug element being so constructed and arranged to engage in pairs and to form a bayonet type connection,
• at least one of said bearing surfaces of each pair of dogs being slightly inclined with respect to a plane perpendicular to the longitudinal axis of said plug element, and
• at least one pair of said bearing surfaces having interlocking means engaging when said closure element is forced away from said insert by pressure in the container so as to prevent disengaging the connection while there is pressure in the container.