| 摘要 |
PROBLEM TO BE SOLVED: To surely fasten even a fastening object part of a soft or fragile material or even when a rivet itself has a covering of low surface friction. SOLUTION: This blind rivet 2 has a cylindrical shell 4, and a mandrel 6, extended by penetrating through the shell. The shell 4 has an outward extending flange 8 for forming a rivet head part in one end part, and has a first radial directional recess set 12 arranged on the surface outer periphery of the shell 4 at a first distance from the rivet head part, and a second radial directional recess set 14 arranged on the surface outer periphery of the shell 4 at a second distance from the rivet head part. The radial directional recesses 12 and 14 are formed by calking the rivet shell 4, after being arranged around the mandrel 6. A shell end part on the distant side from the rivet head part becomes a blind end part of the shell. The mandrel 6 has a head part 10 abutting against the blind end part of the shell 4 on one end, and a stem extending from the head part. The stem has a fragile point 17 in the middle in the length direction.
|
