Patent ID: 9080591
Filing Date: 2015-07-14
Classification: F16B

Abstract:
1. A concentric threaded fastener comprising: a body comprising a starting shape at one end, an ending shape at another end wherein said starting shape is not a circle and at least one continuous surface formed by a plurality of concentric layers disposed between said starting shape and said ending shape; wherein each of said plurality of layers has a thickness defined by slices taken perpendicular to a central longitudinal axis such that a shape of each successive slice from said starting shape to said ending shape is dimensioned to have a local clearance such that said shape of said slice fits within a shape of an adjacent larger slice and such that said plurality of layers forms a plug when each of said plurality of layers is aligned in an unrotated position; and wherein each of said plurality of slices of said plurality of layers is successively rotated about a central axis to form said at least one substantially continuous surface.