Patent ID: 6406210
Filing Date: 2002-06-18
Classification: F16B,Y10T

Abstract:
A combination for making a mechanical screw connection in metal structures, comprising:a first metal structure, said first metal structure including front and back ends defining a cavity internal of said first metal structure; said cavity having first and second ends and being of a predetermined length, said first end of said cavity being located at said front end of said first metal structure and said second end of said cavity being located internally within said first metal structure at a predetermined position between said front and back ends of said first metal structure; said first metal structure further includes a passages internal of said first metal structure, said passage extending from said back end of said first metal structure through said second end of said internal cavity; a machine screw, said machine screw including a head and a shaft; said shaft comprising a predetermined length and diameter and including screw threads, said screw threads extending from a distal end of said shaft over at least a portion of said length of said shaft; said head being captured within said internal cavity and said shaft projecting outwardly from said first metal structure beyond one of said front and rear ends of said first metal structure; an insert for capturing said head within said internal cavity, said insert being positioned entirely within said internal cavity and being attached to said first structure for barring withdrawal of said machine screw head from said internal cavity, said insert including a central passage there through, said central passage being axially aligned with said passage in said first metal structure: a backstop, said backstop being positioned within said internal cavity in between said head and said second end of said internal cavity to prevent said head from contacting said second end of said internal cavity and limiting maximum insertion of said insert within said internal cavity; said backstop including a passage there through, and said backstop member passage being axially aligned with said passage in said first metal structure and said central passage in said insert; and said head being wider than said passage of said first structure, said passage in said backstop, and said central passage of said insert, and said diameter of said shaft being smaller than said passage of said first structure, said passage in sail backstop, and said central passage of said insert to prevent passage of said head, but permit extension of said shaft; and wherein said combination further comprises an insert for capturing said head within said internal cavity, said insert being positioned within said cavity and attached to said first structure for barring withdrawal of said machine screw head from said internal cavity, said insert including a central passage there through; and wherein said insert comprises a cylinder having first and second ends and a cylindrical outer wall; and wherein said internal cavity further comprises a cylindrical geometry and contains a cylindrical side wall; said cylindrical side wall including a screw thread, said screw thread extending from said first end of said cavity a predetermined axial distance; and wherein said cylindrical outer wall of said insert includes a screw thread for mating engagement with said screw thread of said cylindrical inner wall of said cavity; and wherein said backstop member further comprises an inverted bowl shaped body containing a cylindrical axially extending passage there through; and wherein said inverted bowl shaped body comprises a hollow cylinder including a cylindrical wall and first and second ends; said first end of said hollow cylinder being open and bordered by a circular edge, and said second end of said hollow cylinder comprising a washer shaped wall; said washer shaped wall containing a central circular passage, and said central circular passage being slightly larger in diameter than said shaft and smaller in size than said head.