초록 ▼

A closure and boss combination for providing an internally threaded outlet in a drum end includes a raised metal boss formed in the drum end and configured with a pair of concentric axially extending annular walls connected by an annular ring-shaped top surface. Securely crimped within the raised me

A closure and boss combination for providing an internally threaded outlet in a drum end includes a raised metal boss formed in the drum end and configured with a pair of concentric axially extending annular walls connected by an annular ring-shaped top surface. Securely crimped within the raised metal boss is a synthetic material closure which includes an internal series of threads surrounded by a crimping flange which includes on its outer diameter surface a series of serrations configured with alternating recesses and protruding portions. The flange includes an interior support surface which is substantially concentric with the outer surface of the serrations and the inner, axially extending wall portion of the boss is contiguous with this inner support surface in order to provide back-up support and preclude close-in of the closure and distortion of the closure threads during the crimping operation and during subsequent stress-inducing operations such as exposure to high-temperature sources.

대표청구항 ▼

In combination: a drum-like container end having a raised boss formed therein, said raised boss including an outer axially extending wall portion, an inner axially extending wall portion and a radially extending connecting wall portion joining said inner and outer wall portions together; and a synth

In combination: a drum-like container end having a raised boss formed therein, said raised boss including an outer axially extending wall portion, an inner axially extending wall portion and a radially extending connecting wall portion joining said inner and outer wall portions together; and a synthetic material closure received by said container raised boss and having plug-engaging means internally disposed therein and an annular crimping flange including a first flange surface contiguous with said outer wall portion and a second flange surface contiguous with said inner wall portion.