Patent ID: 8931990
Filing Date: 2015-01-13
Classification: B23P,F16B,Y10T

Abstract:
1. A pierce nut for punching through and attachment to a plastically deformable metal sheet, said pierce nut comprising: a pilot having an end surface that defines a portion of a front end of said pierce nut, said end surface of said pilot designed to engage and punch through the metal sheet to form an opening in the metal sheet when said end surface is forced against the metal sheet, said end surface positioned about a hole in said pilot, said end surface lies in an end surface plane; an abutment surface spaced rearwardly of said end surface, said abutment surface defines an outer edge portion of said front end of said pierce nut, said abutment surface design to abut against the metal sheet after said end surface punches through the metal sheet, said abutment surface having a face that lies in an abutment surface plane, said abutment surface plane parallel to said end surface plane; a first groove positioned between said pilot and said abutment surface, said first groove having a first wall, a second wall and a transition surface connected between said first and second wall, an outer peripheral edge of said end surface terminating at said first wall, said first wall sloped downwardly from said end surface and toward a central axis of said pilot, said transition surface having an arcuate shape, said second wall sloped upwardly from said transition surface and away from said central axis of said pilot; and, a second groove which is positioned between said abutment surface and said first groove and at least partly surrounds the first groove, said second groove positioned rearwardly of said end surface of said pilot, said second groove having a first wall, a second wall and a transition surface connected between said first and second wall, said first wall of said second groove terminating at said second wall of said first groove, said first wall of said second groove sloped downwardly from said abutment surface plane, said transition surface of said second groove having an arcuate shape, said second wall of said second groove sloped upwardly from said transition surface of said second groove and away from said central axis of said pilot and terminating at said abutment surface.