Patent ID: 6662490
Filing Date: 2003-12-16
Classification: A01M,E01C,F16L

Abstract:
A core hole plug assembly for covering and sealing a hole, comprising:a stainless steel cover plate; the cover plate having an upper side and a lower side; the cover plate having an outer diameter greater than a diameter of a hole to be covered and sealed by the core hole plug assembly; the cover plate having a central opening therein for receiving a bolt shaft of a stainless steel bolt and nut assembly for moving a stainless steel compression plate relative to the cover plate; a resilient expansible cylindrical plug made of a polymeric material; the expansible plug having an upper end and a lower end portion; the upper end of the expansible plug being permanently and nonrotatably bonded to the underside of the cover plate; the expansible plug having a tubular sidewall; the expansible plug, in an unexpanded state, having an outside diameter between about 2Â¾ and about 2&frac78; inches and a height between about 1 and 1Â½ inches; the expansible plug having an unexpanded outer diameter less than the diameter of the cover plate and about &frac18; to about Â¼ of an inch less than a diameter of a hole to be covered and sealed by the core hole plug assembly; the expansible plug being expandable to an outer diameter greater than a diameter of a hole to be covered and sealed by the core hole plug assembly; the polymeric material of the expansible plug forming a lowermost disk shaped layer of the core hole plug assembly and having indicia thereon; the compression plate having a diameter equal to or less than the unexpanded outer diameter of the expansible plug; the compression plate being permanently and nonrotatably secured to the lower end portion of the expansible plug by being embedded in the lower end portion of the expansible plug; and the nut of the bolt and nut assembly for moving the compression plate relative to the cover plate being permanently and nonrotatably secured to the compression plate; the bolt of the bolt and nut assembly having a head on the upper side of the cover plate and a shaft passing through the central opening in the cover plate, through the expansible plug and threaded into the nut whereby the expansible plug can be expanded in diameter by tightening the bolt and nut assembly and reduced in diameter by loosening the bolt and nut assembly; and the central opening in the cover plate having a recess therein so that the head of the bolt is substantially flush with an upper surface of the cover plate.