Importance

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Abstract

A removable closure for blocking an opening able to resist high forces is formed by a plug assembly installed in a receptacle located over the opening, the receptacle including a smaller bore at the beginning of the receptacle and a larger bore adjacent thereto, these bores together forming an inwardly extending rim and an adjacent groove, with opposite radial clearance openings extending axially through the rim. The plug assembly includes two oblong plates mounted on a plug member, a first oblong plate threaded onto an intermediate threaded section of the plug member, a second oblong plate fixed to the end of the plug next to the first oblong plate in a crosswise orientation. The plug member is rotated to align the two oblong plates in preparation for insertion into the receptacle, and the ends thereof are then inserted into the clearance openings to position the second oblong plate entirely within the groove while leaving the first oblong plate ends interfit within the clearance openings. The plug member is rotated back to retighten the threaded engagement with the first oblong plate and to orient the second oblong plate within the groove crosswise to the first oblong plate and located behind one side of the rim to be able resist high forces exerted thereon without loading the threaded connection.

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First Claim