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US 4,380,303 AGranted
Molded container and opening means therefore
AssigneeBuckeye Molding Company
InventorsDavid O. Allen, Harry A. E. Wombold
Life of this patent
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AssigneeBuckeye Molding Company
InventorsDavid O. Allen, Harry A. E. Wombold
Estimating the term…
An essentially straight walled, minimally tapered or non-tapered container is provided with a radially outwardly projecting chime or bead formation which enables gripping of such container when molded to facilitate removal of the container from an injection mold apparatus. The described molded part extraction technology allows the formation of a novel easy-open closure in which the easy-openable closure structure is injection molded and may be one piece with a container side wall. The disclosure also includes a description of two forms of molding method and apparatus suitable for accomplishment of the described technology. The novel easy openable closure structure includes a closure panel forming a side wall which is inwardly convergent from one end of the container. A weakened web connects the closure panel to the container. The closure panel is provided with other weakened webs and a pull ring which enables removal of the closure panel by a pulling force exerted on the pull ring.
A one-piece injection molded plastic container blank comprising a tubular body having one end closed and one end open, said body having an outwardly projecting chime surrounding the closed end thereof and an outwardly projecting flange surrounding the open end thereof, the surface of said flange distal said chime diverging outwardly with increasing distance from said chime, the exterior surface of said tubular body being substantially right-cylindrical from said chime to said flange and the surface of said flange proximal said chime intersecting said right-cylindrical exterior surface to form an obtuse included angle with said substantially right-cylindrical exterior surface.
A container having an injection molded plastic body part including a tubular portion having at one end thereof closure means one-piece with said tubular portion, said tubular portion having at the opposite end thereof outwardly projecting flange means one-piece with said tubular portion, said container further including a sheet material closure having a double-seamed juncture with said flange, said tubular portion having an outwardly projecting chime one-piece therewith which surrounds said closure means, said tubular portion having a substantially right-cylindrical outer surface extending from said chime to said flange, said first closure being an easy-open closure.
A molded one-piece plastic container blank comprising a tubular body open at one end thereof and having integrally formed closure means closing the opposite end thereof, said body including a chime surrounding said opposite end, said closure means including a closure panel spaced inwardly of said container from said chime and a relatively thin and thereby weakened first web bridging the space between said chime and said closure panel and having uninterruptedly continuous junctures with each of said chime and said closure panel, said closure panel having an integrally formed side wall which is inwardly convergent from said web, said side wall having an outer surface notched to define a second web spaced from and extending parallel to said first web, said side wall having a groove defining a third web therein extending from said first web to said second web, and pull open means one-piece with said side wall disposed adjacent said third web and manually pullable for rupturing said first, second and third webs.
A molded one-piece plastic container blank comprising a tubular body open at one end thereof and having integrally formed closure means closing the opposite end thereof, said body including a chime surrounding said opposite end, said closure means including a closure panel spaced inwardly of said container from said chime and a relatively thin and thereby weakened first web bridging the space between said chime and said closure panel and having uninterruptedly continuous junctures with each of said chime and said closure panel, said closure panel having an integrally formed side wall which is inwardly convergent from said web, said closure panel having a notch facing inwardly of said container defining a second web spaced from and extending parallel to said first web, said side wall having groove means defining connecting web means extending from said first web to said second web, and pull open means one-piece with said side wall disposed adjacent said connecting web means and manually pullable for rupturing said first web, said second web, and said connecting web means.
Dependencies are inferred from the claim text.