Floating captivated wrenchable nut

F - Mech Eng,Light,Heat,Weapons – 16 – B

Patent

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Details

F16B 37/00 (2006.01) F16B 37/06 (2006.01)

Patent

CA 2430730

A two-piece fastening system utilizes separate parts, a nut and a retainer, which are securely united from opposite sides of the captivating element such as a sheet or panel. The nut body which has an axial threaded bore includes an integral collar located on one side of the nut having an outside diameter less than the outside diameter of the nut body. A tubular shank unitary with the nut body extends coaxially from the collar, the outside diameter of the shank being less than the outside diameter of the collar. The shank includes an expandable portion near its end which is deformable to provide attachment to the second part, a retainer, which has a bore that receives the expandable portion of the shank. The retainer bora includes an inside wall against which the expandable portion of the shank is forced to achieve attachment of the parts. The width of the retainer is preferably greater than the length of the shank so that once attached, the end of the shank is below the endface of the retainer. The inner face of the retainer abuts an annular end of the collar so that forces between the retainer and a threadably attached part cannot be transferred through the deformable portion of the shank. The retainer may be composed of a harder material or one that provides reduced friction to enhance its capability as a rotational, load-bearing surface. The two parts are assembled to the panel by inserting the tubular shank of the nut through the panel aperture, installing the retainer over the shank from the opposite side of the panel, and then deforming the shank against the inner wall of the retainer.

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