Patent ID: 6276040
Filing Date: 2001-08-21
Classification: B23P,F16B,Y10T

Abstract:
A method of attaching a metal fastening element to a metal plate-like element, said fastening element including a central annular pilot, an annular contact face surrounding said pilot and an annular recess in said contact face surrounding said pilot having a bottom wall, an inner side wall adjacent said pilot and an outer side wall, said method comprising:forming an opening in said plate-like element and inserting said pilot of said fastening element through said opening;deforming an annular portion of said plate-like element surrounding said opening into said annular recess and against said bottom wall;deforming circumferentially spaced outer portions of said pilot toward said bottom wall of said recess and radially outwardly to form integral circumferentially spaced radial projections overlying said annular portion of said plate-like element, thereby clamping said annular portion of said plate-like element in said annular recess of said fastening element.