A MEMBER FOR REMOVABLY CLOSING A CYLINDRICAL OPENING

摘要

A removable closure member for closing a cylindrical opening having a circumferential slot therein, the closure member formed of a plug body having a top surface (90) and an external cylindrical surface (80), a first and a second leaf (192, 194) each having an outer substantially semi-cylindrical edge, a first end portion of each leaf (192, 194) being pivotally secured to the plug body permitting each leaf to be pivoted between a retracted position and an expanded position in which the outer edge of each leaf is receivable within the circumferential slot (76) in the cylindrical opening and a plug holder removably attachable to the plug body top surface and having a rotatable portion for pivoting the leaves between their retracted and expanded positions.