| 摘要 |
<p>A closure assembly for a shipping and storage drum 22, the drum having an internally threaded plastic outlet 21 for receipt of the closure assembly. The closure assembly comprises a plastic closure 20 having an exterior end which remains outside of the internally threaded outlet 21 and opposite thereto an inserted end which extends into said threaded outlet 21 when said closure is received by the storage drum 22. The closure 20 is formed as an integral one-piece member and includes an externally threaded, generally cylindrical main body portion 40 and an outwardly radiating annular flange 43 adjacent the exterior end and being disposed at one end of said main body portion 40. The flange 43 is formed with and defines a three-sided, annular groove 44 opening towards the inserted end. The groove 44 includes a top axial wall 52, an outer inclined sidewall 54 and an inner, cylindrical sidewall 53. An annular elastomeric gasket 61 has an inside cylindrical surface 62 and is assembled into the groove 44 so as to be encapsulated between the sides of the groove. The gasket 61 is held in position by sizing the cylindrical sidewall 53 larger than the cylindrical surface 62 thereby causing the gasket 61 to stretch in order to fit around the cylindrical sidewall 53. <IMAGE></p> |
