Compressive indentation fastener device

A compression indentation fastener device having a nail-like arrangement comprising:

• a shank extending along a shank axis and between a first end and a second end;
• a tip that smoothly tapers to a point at said first end of said shank;
• a head disposed at said second end of said shank, said head extending outwardly from said second end of said shank in a transverse plane that is substantially perpendicular to said shank axis to define a head periphery;
• said shank having a shank diameter and an exterior surface consisting of a smooth cylindrical shape that runs the entire length of said shank from said head to said tip;
• said head having an anterior side adjacent said second end of said shank and a posterior side opposite said anterior side, said anterior side of said head including an exposed area arranged to impact a first surface of a substrate material, said exposed area extending between said second end of said shank and said head periphery;
• said anterior side of said head including a relief portion disposed between said shank and said head periphery, said relief portion spaced radially inward of said head periphery to define a bearing surface that is disposed radially between said relief portion and said head periphery, wherein said relief portion is a depression that extends continuously about said second end of said shank and that is open at said anterior side of said head to receive and compress a volume of the substrate material when said exposed area of said anterior side of said head impacts the first surface of the substrate material, creating an area of densely compacted substrate at a location adjacent said bearing surface;
• and
• said head including a convergent surface extending radially outwardly from said second end of said shank to a peak of said relief portion on said anterior side of said head at a progressively increasing diameter such that said head has a diameter that is greater than said shank diameter at all points along said convergent surface and a divergent surface extending outwardly from said peak to said bearing surface, wherein said convergent surface is smooth and has a frustoconical shape,
• wherein said head is made of a rigid material that has a hardness of at least 3.5 on Mohs hardness scale.

A compression indentation fastener device having a nail-like arrangement comprising:

• a shank extending along a shank axis and between a first end and a second end, said shank having a shank diameter and an exterior surface that is smooth and has a cylindrical shape;
• a head disposed at said second end of said shank, said head extending outwardly from said second end of said shank in a transverse plane that is substantially perpendicular to said shank axis to define a head periphery;
• said head having an anterior side adjacent said second end of said shank and a posterior side opposite said anterior side, said anterior side of said head including an exposed area arranged to impact a first surface of a substrate material, said exposed area extending between said second end of said shank and said head periphery;
• said anterior side of said head including a relief portion disposed between said shank and said head periphery, said relief portion spaced radially inward of said head periphery to define a bearing surface that is disposed radially between said relief portion and said head periphery, wherein said relief portion is a depression that extends continuously about said second end of said shank and that is open at said anterior side of said head to receive and compress a volume of the substrate material when said exposed area of said anterior side of said head impacts the first surface of the substrate material, creating an area of densely compacted substrate at a location adjacent said bearing surface;
• and
• said head including a convergent surface extending radially outwardly from said second end of said shank to a peak of said relief portion on said anterior side of said head at a progressively increasing diameter such that said head has a diameter that is greater than said shank diameter at all points along said convergent surface and a divergent surface extending outwardly from said peak to said bearing surface, wherein said convergent surface is smooth and has a frustoconical shape,
• wherein said bearing surface has a planar, ring-like shape that defines a reference plane that is substantially parallel to said transverse plane and that is substantially perpendicular to said shank axis, said posterior side of said head being located to one side of said reference plane and said first end of said shank being located to an opposite side of said reference plane,
• wherein said head is moveable between a first impacted position and a second impacted position, said reference plane of said bearing surface is adapted to be aligned with the first surface of the substrate material in said first impacted position, and at least a portion of said head is adapted to be embedded in the substrate material in said second impacted position,
• wherein said head is made of a rigid material that resists deformation when said head moves from said first impacted position to said second impacted position, said rigid material of said head is adapted to be harder than the substrate material,
• wherein said rigid material of said head has a hardness of at least 3.5 on Mohs hardness scale.