Interference fit bolt and sleeve

Details Interference fit bolt and sleeve Interference fit bolt and sleeve

1990-01-16

1991-05-28

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Having separate expander means

Frangible member

411339, 411383, F16B 1304, F16B 2100

Patent

active

050189204

ABSTRACT:
In this fastening system two or more layers of material are fastened together by inserting a hollow sleeved fastener such as a rivet or a bolt into the hole in a high interference fit to expand the hole radially. The sleeve is configured either as a collar and a straight shank or as an angled upper portion combined with a shank for counterbored applications. The intersections between either the collar and the shank or the angle portion and the staight shank are designed with an enlarged radius such that when the sleeve is expanded after the insertion of the fastener inside of it, this radius is expanded, which in turn stress coins the adjacent edge of the hole in the layers. This localized stress coining as well as the hoop stress in the hole surrounding the hole dramatically increases the fatigue strength of the fastened layers in a structure assembly.

REFERENCES:
patent: 3915052 (1975-10-01), Ruhl
patent: 4850771 (1989-07-01), Hurd

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