LARGE SECONDARY HEAD RIVET

摘要

A blind rivet of the type adapted to be inserted into the opening in a workpiece and having a flange at one end and adapted to be deformed by the head of a mandrel at the opposite end when the mandrel is pulled. The blind rivet has an elongated rivet body carrying a flange at one end with a plurality of longitudinally extending weakened areas being provided on the body between the flange and the opposite end. The weakened areas form slits which are spaced from the flange and the opposite end so that a continuous solid annular section is formed on the rivet body adjacent the flange and the opposite end. Longitudinally extending solid portions are formed between the weakened areas that have abutting line contact throughout their longitudinally extent at the weakened areas. These weakened areas are adapted to separate when the rivet body is deformed to form from the solid portions a plurality of outwardly extending petals that form an enlarged secondary head on the rivet. The weakened areas only of the rivet body are adapted to be deformed when a mandrel, extending through the body is pulled so that minimal lateral forces would be exerted on an opening in a workpiece and the deformation of the rivet body would be localized. When the rivet is deformed, the solid annular section adjacent the opposite end is adapted to retain the mandrel head to seal the rivet within the workpiece opening.