Multi-grip blind rivet

Abstract

A multi-grip blind rivet 74 includes a rivet body 82 , adapted to receive a portion of a mandrel 76 . A plurality of indentations 88 are formed in an outer surface 86 of the rivet body 82 in each of three axially spaced transaxial planes. Each indentation 88 is formed with a work hardened base surface 90 having a convex portion, which is formed with axially spaced first and second transaxial edges 106 and 108 having nonlinear portions. Adjacent indentations 88 are separated by ribs 89 . A flared intermediate surface 122 extends between the base surface 90 and the outer surface 86 . The rivet 74 is assembled within aligned holes 128 and 130 of workpieces 124 and 126 , respectively, where, upon setting of the rivet, the indentations 88 collapse and the outer surface 86 bulges against walls of the holes to retain the workpieces together.

1 .- 29 . (canceled)  
   
   
       30 . A multi-grip blind rivet comprising: 
 a mandrel having a stem and a pulling head at one end of the stem;    a hollow cylindrical body having an outer surface and formed about an axis thereof and adapted to receive the stem of the mandrel therethrough; and    a plurality of indentations formed in the outer surface of the cylindrical body, at least one of the plurality of indentations formed with a base surface having a first arcuate transaxial edge extending along a length thereof and concavely facing a second substantially linear transaxial edge spaced axially from the first arcuate transaxial edge.    
   
   
       31 . The multi-grip blind rivet of  claim 30  wherein the at least one indentation is positioned at an end of the hollow cylindrical body adjacent the pulling head and wherein the second linear transaxial edge is positioned closer to the end than the first arcuate transaxial edge.