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A one piece thermoplastic tighthead drum having a drum body, a bottom, a top and at least one handling ring, at least one of said top and/or bottom including a raised central section surrounded by an annular groove defined by a groove floor, a first sidewall connecting the groove floor and the raise

A one piece thermoplastic tighthead drum having a drum body, a bottom, a top and at least one handling ring, at least one of said top and/or bottom including a raised central section surrounded by an annular groove defined by a groove floor, a first sidewall connecting the groove floor and the raised central section and a second sidewall comprising at least a portion of the handling ring. The drum body, the top and/or bottom having the handling ring associated with it and the handling ring converge in an area of merger, the interior surface of which comprises a smooth undulating surface having at least four radii. The configuration provides a double hinge for minimizing the effects of drop impact in the area of merger.

대표청구항 ▼

1. A one piece thermoplastic drum comprisinga drum body having an upper end and a lower end, at least one handling ring, a bottom at the lower end of the drum body, and a top at the upper end of the drum body, at least one of the top and bottom comprising a raised central section and an annular groo

1. A one piece thermoplastic drum comprisinga drum body having an upper end and a lower end, at least one handling ring, a bottom at the lower end of the drum body, and a top at the upper end of the drum body, at least one of the top and bottom comprising a raised central section and an annular groove outward of said raised central section, the annular groove being formed by a groove floor, a first sidewall extending from the groove floor to the raised central section and a second sidewall comprising at least a portion of the handling ring wherein the at least one of the top and bottom, the drum body and the handling ring converge in an area of merger having an interior surface associated therewith, said interior surface comprising a smooth undulating surface comprising at least four radii.