Patent ID: 7401707

Claim:
A closure that includes: an outer plastic shell having an annular base wall, a skirt with a central axis extending from an outer peripheral edge of said base wall, a circumferential array of lugs on an underside of said base wall, a pair of axially spaced internal beads on said skirt spaced from said base wall, and an opening defined by an inner peripheral edge of said base wall, an inner plastic shell having an annular base wall, a skirt with a central axis extending from an outer peripheral edge of said base wall, at least one internal thread on said skirt of said inner shell, a circumferential array of lugs on an outer surface of said base wall, a circumferential external bead on an outer surface of said skirt adjacent to an edge of said skirt remote from said base wall, and a dome extending from an inner peripheral edge of said base wall coaxially and oppositely from said skirt, said inner shell being positionable within said outer shell in a non-child-resistant first position with said external bead on said skirt of said inner shell captured between said internal beads on said skirt of said outer shell and said outer shell rotatably coupled to said inner shell so that said at least one internal thread on said skirt of said inner shell can be threaded onto and off of a container by rotation of said outer shell, said inner shell being positionable within said outer shell in a child-resistant second position with said dome extending into said opening, and with said external bead on said inner shell skirt spaced from said internal beads on said outer shell skirt such that rotation of said outer shell is imparted to said inner shell by engagement of said lugs on said base walls, the internal bead further from said base wall of said outer shell having a lesser internal diameter than the internal bead closer to said base wall of said outer shell to retard removal of said inner shell from within said outer shell in said non-child-resistant first position of said inner shell, said outer shell including ribs extending entirely between said internal beads, and said inner shell including ribs on said external bead for engagement with said ribs on said outer shell in said non-child-resistant first position of said inner shell, said ribs on said outer shell having radially inner edges that blend with innermost edges of said internal beads and being angulated between said internal beads with respect to said central axis of said outer shell.