초록 ▼

A one-piece blow-molded closed plastic drum having an integrally-formed compression-molded handling ring and method of molding same is provided. The drum has structural strength and stability to resist breakage of the drum upon impact due to tipping or dropping of the drum. The drum includes a gener

A one-piece blow-molded closed plastic drum having an integrally-formed compression-molded handling ring and method of molding same is provided. The drum has structural strength and stability to resist breakage of the drum upon impact due to tipping or dropping of the drum. The drum includes a generally cylindrical body portion and a head portion integrally-molded with an upper end of the body portion including a transition area around and between the upper end of the body portion and a top of the drum in the head portion. The transition area has an outside curved surface of a predetermined radius so that an outside surface of the body portion is positioned in a tangential plane in close proximity to a tangential plane along the outer circumferential surface of the handling ring and/or an inside curved surface with at least one radius, preferably a double ogee with three predetermined radii, so that no acute angles are formed between inside surfaces at the transition area.

대표청구항 ▼

[ What is claimed is:] [1.] A one-piece blow-molded closed plastic drum, comprising:a generally cylindrical body portion defining an outer cylindrical surface and an inside surface:a bottom integrally-molded with a lower end of said cylindrical body portion;a head portion integrally-molded with an u

[ What is claimed is:] [1.] A one-piece blow-molded closed plastic drum, comprising:a generally cylindrical body portion defining an outer cylindrical surface and an inside surface:a bottom integrally-molded with a lower end of said cylindrical body portion;a head portion integrally-molded with an upper end of said cylindrical body portion and defining a top having an inside surface and a transition area extending around and connected at a lower end to an upper end of said body portion and connected at an upper end to said top;a handling ring integrally-molded with said drum and having a leg member extending upwardly from Generally said upper end of said transition area and a grippable member extending generally outwardly from an upper end of said leg member to define an outer circumferential surface on said handling ring; andsaid transition area having an inside curved surface below the connection to said leg member of said handling ring and with at least one predetermined radius so that no acute angles are formed between said inside surfaces of said top, said transition area and said body portion, said transition area inside curved surface defining a double ogee with three predetermined radii.