초록 ▼

A closure assembly for a shipping and storage drum where the drum includes an internally threaded plastic outlet for receipt of the closure assembly includes a plastic closure having a generally cylindrical main body portion which is externally threaded and which constitutes the leading edge of thre

A closure assembly for a shipping and storage drum where the drum includes an internally threaded plastic outlet for receipt of the closure assembly includes a plastic closure having a generally cylindrical main body portion which is externally threaded and which constitutes the leading edge of threaded engagement into the outlet. Disposed at the upper end of the main body portion and integral therewith is an annular, peripheral flange the underside of which is shaped with an annular groove which is designed to receive an elastomeric gasket. The annular groove has an outwardly inclined outer wall and a generally cylindrical inner wall. The gasket is held in position as part of the closure by an interference fit between the inside surface of the gasket and the inner cylindrical wall of the groove. The plastic outlet of the shipping and storage drum includes a generally cylindrical raised rib and outward thereto and concentric therewith a generally cylindrical raised wall. Upon full threaded engagement of the closure into the outlet, the raised rib presses into the central area of the elastomeric gasket and the upper surface of the closure is seated within the raised wall and is below the top surface of the wall. The external threads of the closure arranged with two threaded portions, one portion being a straight thread and the lower or leading edge portion being a tapered thread. The thread pitch is the same and the threads are continuous with each other.

대표청구항 ▼

[ What is claimed is:] [1.] A closure assembly for a shipping and storage drum, said drum having an internally threaded plastic outlet for receipt of said closure assembly, said closure assembly comprising:a plastic closure having an exterior end which remains outside of said internally threaded out

[ What is claimed is:] [1.] A closure assembly for a shipping and storage drum, said drum having an internally threaded plastic outlet for receipt of said closure assembly, said closure assembly comprising:a plastic closure having an exterior end which remains outside of said internally threaded outlet and opposite thereto an inserted end which extends into said threaded outlet when said closure is received by the storage drum, said closure being formed as an integral one-piece member and including an externally threaded, generally cylindrical main body portion and an outwardly radiating annular flange adjacent said exterior end and being disposed at one end of said main body portion, said flange being formed with and defining a three-sided, annular groove opening towards said inserted end and including a top axial wall, an outer inclined sidewall and an inner, generally cylindrical sidewall; andan annular ring-shaped elastomeric gasket having an inside, generally cylindrical surface and being assembled into said groove and being held in position by sizing the generally cylindrical sidewall larger than said generally cylindrical surface thereby causing the gasket to stretch in order to fit around said generally cylindrical sidewall.