초록 ▼

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

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.

대표청구항 ▼

1. 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

1. 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. 2. The container blank of claim 1 wherein the surface of said flange distal said chime is an uninterrupted extension of the interior surface of said tubular body. 3. The container blank of claim 1 formed of high-density polyethylene. 4. The container blank of claim 1 wherein the closed end of said tubular body comprises a closure panel surrounded by said substantially right-cylindrical exterior surface and merging to become one-piece with the interior surface of said tubular body intermediate said chime and said flange. 5. The container blank of claim 4 wherein the interior surface of said tubular body is axially parallel to within 6 minutes of one degree to said substantially right-cylindrical outer surface between said flange and said closure panel. 6. The container blank of claim 1 wherein said obtuse included angle measured in any plane common to the axis of said substantially right-cylindrical exterior surface is about 165°. 7. The container blank of claim 1 wherein the outer reach of said chime from said substantially right-cylindrical exterior surface exceeds the outer reach of said flange from said substantially right-cylindrical exterior surface. 8. 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. 9. The container of claim 8 wherein the outward extent of said chime from said substantially cylindrical surface approximately equals the outward extent of said double-seamed juncture from said cylindrical surface. 10. The container of claim 9 wherein the axial extent of said chime approximately equals the axial extent of said double-seamed juncture. 11. 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. 12. The molded container blank of claim 11 wherein said first web is a circular web, and said second web extends circularly parallel to said first web for an angle less than 360° measured from the juncture of said third web with said second web so that rupture of said second web terminates before rupture of said first web is completed with the consequence that manual pulling of said pull means can entirely free said closure panel from said container. 13. The container blank of claim 11 wherein said pull-open means comprises a spoke member projecting into and surrounded by said side wall, said pull-open means further including flange means one piece with said spoke member and projecting laterally from said spoke member, one end of said flange means one piece with said side wall, said third web rupturable by reason of a lateral movement of said spoke member about the juncture of said flange means with said side wall. 14. The container blank of claim 13 including finger engageable ring means one piece with said spoke member at the end thereof which is most remote from said side wall. 15. 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. 16. The molded container blank of claim 15 wherein said first web is a circular web, and said second web extends circularly parallel to said first web for an angle less than 360° measured from the juncture of said connecting web means with said second web so that rupture of said second web terminates before rupture of said first web is completed with the consequence that manual pulling of said pull means can entirely free said closure panel from said container. 17. The container blank of claim 15 wherein said pull-open means comprises a spoke member projecting into and surrounded by said side wall, said pull-open means further including flange means one piece with said spoke member and projecting laterally from said spoke member, one end of said flange means one piece with said side wall, said connecting web means rupturable by reason of a lateral movement of said spoke member about the juncture of said flange means with said side wall. 18. The container blank of claim 17 including finger engageable ring means one piece with said spoke member at the end thereof which is most remote from said side wall. 19. The molded container blank of claim 11, 12, 13, 14, 15, 16, 17 or 18 wherein said one end of said tubular body has outwardly projecting flange means one piece with said tubular body for attachment of a sheet material closure thereto. 20. The molded container blank of claim 19 wherein said plastic is high-density polyethelene. 21. The molded container blank of claim 11, 12, 13, 14, 15, 16, 17, or 18 wherein said plastic is high-density polyethelene.