Patent ID: 7207457

Claim:
A molded plastic closure for an open top, industrial container of the type having an undercut top rim and wherein said enclosure comprises: a central deck portion; an inverted, U-shaped channel portion peripherally of said deck portion to receive and lock onto said undercut top rim; said channel portion comprising substantially parallel and concentric, but radially spaced, inner and outer walls, said outer wall defining an inwardly extending locking flange for cooperation with said undercut rim; said outer wall being integrally formed with an outwardly flaring skirt having an annular lower end portion; and a substantially continuous pattern of V-shaped ribs formed around and on the inside of said skirt, each V-shaped rib being integral with and extending from said flange to said lower end portion to increase the strength of at least said skirt; said molded plastic closure further including a tear line extending circumferentially around the lower end portion of said skirt and immediately below the bottoms of said V-shaped ribs: an opening in said skirt to interrupt said tear line and define a tear strip; a breakaway pull tab integral with said tear tab; and a plurality of U-shaped space parallel ribs formed on the inside surface of said pull tab and defining, in combination with the inside surface of said pull tab, an overall concavity to enhance manual gripping of said pull tab to remove said tear band.