Blind fastener assembly.

摘要

A blind fastener assembly is disclosed, which is suitable for use in joint assemblies including advanced composite materials. The fastener assembly includes a pin (20), an expander (22), a sleeve (24), and an expandable washer (26), each of which have an initial diameter which permit them to pass through a hole in the workpiece. The washer is mounted about the pin shank between the sleeve and a tapered nose portion of the expander. The fastener assembly is inserted in a hole in the workpiece so that the expander head abuts the workpiece. Rotation of the pin causes the sleeve to force the washer to slide over the tapered nose (42) portion of the expander causing it to expand and abut the blind side of the workpiece. In one embodiment the pin threadably engages the expander and the head of the pin is positioned on the blind side of the workpiece. The washer is initially seated in a groove (36) in the pin shank. Rotation of the pin causes its head and the sleeve to advance toward the workpiece, and the washer is forced from the groove by the sleeve causing it to partially expand. Expansion is completed when the sleeve forces the washer over the tapered nose portion of the expander. In another embodiment the pin head is positioned on the accessible side of the workpiece and the pin threadably engages the sleeve. The washer is mounted about the pin on an extended portion of the expander which extends from the nose position. Rotation of the pin causes the sleeve to advance toward the workpiece forcing the washer over the tapered nose portion of the expander until it is fully expanded and abuts the workpiece.