Importance

Loading Importance Indicators...

Abstract

A nosepiece for use with a pulling head and a riveter for installing blind bolts, primarily the 'Unimatic' or 'U' type. The nosepiece is preferably made out of two different components (a hard and tough one acting as the interface to the fastener, and a soft, ductile one acting as a shock absorber) and has an active area which is annular and effectively matched to the dimensions of the locking collar of the blind bolt. No tapered surface interferes with the sleeve during installation of the blind bolt. Instead, the active area includes a protrusion which intersects a support surface generally at a ninety degree angle. Providing a minimum or no transition fillet radius from the active area to the support area allows for a minimum length of the active area, providing maximum reinforcement to the active area. It also concentrates the operating stresses in a known area, dispersing them from the critical, working surface of the active area, providing an expected failure mode. A two piece design dissipates the operating stresses away from the active area, moving the unavoidable failures to an internal area of the nosepiece that cannot affect installation of the fastener. This 'stress and shock absorption' together with the design features described above leads to superior reliability and dramatic endurance improvements.

Loading the Abstract Image...

First Claim