Screw closures for containers
AssigneeCMB Foodcan plc
InventorMalcolm G. Collins
Life of this patent
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Abstract
A screw closure for a container has a metal body shell (30) into which a plastics moulding (44) is snap-engaged. The moulding provides a screw thread (52) for the closure; in addition, it extends below the body shell to provide a security ring (50) which is attached by rupturable bridges (62). Relative rotation of the moulding and body shell when the closure is being fitted onto a container is prevented by teeth (58) formed around the top edge of the moulding, which deeply indents the sealing gasket (38) of the body shell.
Claims14
A screw closure, which has a metal body shell with a closure panel and a tubular skirt depending integrally therefrom, and a preformed tubular member of a moulded plastics material providing within the skirt of the metal body shell a generally cylindrical thread-forming region for engagement with a thread formation of the container, the plastics member being fitted into the skirt of the body shell after moulding by relative axial movement and snap-engagement of an end portion of the body shell behind an annular shoulder of the plastics member, the annular shoulder being interrupted by a plurality of circumferentially spaced, axially extending grooves which are formed in the plastics member exterior and extend from the annular shoulder towards the closure panel.
Dependencies are inferred from the claim text.