Controlled expansion protruding-head rivet design

摘要

The rivet 10 comprises a shank portion 12 having a minimum and maximum shank diameter 18. The flush head 14 of the rivet includes a head diameter 23 before forming a land 24 on the edge thereof of between 1.875 times the minimum shank diameter 18 and 1.879 times the maximum shank diameter. The major crown 25 has a height 26 between 0.063 times the minimum shank diameter 18 and 0.078 times the maximum shank diameter and a major crown radius 27 between 2.974 times the minimum shank diameter 18 and 2.690 times the maximum shank diameter. The minor crown radius 30 is between 4.014 times the minimum shank diameter and 2.880 times the maximum shank diameter. The minor crown height 29 of between 0.021 times the minimum shank diameter and 0.031 times the maximum shank diameter. The underhead surface 32 taper angle 34 is between 102 and 103 degrees. The land 24 has a width 37 between 0.021 times the minimum shank diameter 18 and 0.012 times the maximum shank diameter. The minimum head diameter 23' after forming the land 24 is 1.823 times the minimum shank diameter 18. The radius 40 between the shank 12 and flush head 14 is between 0.030 times the minimum shank diameter 18 and 0.080 times the maximum shank diameter. The tail portion 41 also varies as a function of the minimum and maximum shank diameter.