Patent ID: 8056742

Claim:
A child-resistant closure that includes: a plastic inner shell having a base wall with a peripheral skirt, at least one internal thread segment on said peripheral skirt and a plurality of external lugs on said base wall adjacent to said skirt, and a plastic outer shell having a base wall with a peripheral skirt and a plurality of internal L-shaped lugs at a juncture of said base wall and said peripheral skirt, each of said L-shaped lugs including a first portion extending radially inwardly along an undersurface of said base wall of said outer shell for engaging said external lugs on said inner shell, and a second portion extending axially along an inner surface of said peripheral skirt of said outer shell for slidably engaging said inner shell and aligning said inner shell within said outer shell, wherein said base wall of said outer shell has a peripheral portion of a first thickness on which said first portions of said internal lugs are disposed and an imperforate central portion of a second thickness less than said first thickness, and wherein said base wall of said inner shell has a peripheral portion of a third thickness on which said external lugs are disposed and an imperforate central portion of a fourth thickness less than said third thickness.