Fastener system using biangular countersink geometry

Details Fastener system using biangular countersink geometry Fastener system using biangular countersink geometry

1996-09-13

1999-02-09

Barefoot, Galen L.

Aeronautics and astronautics

Aircraft structure

Details

411507, 411424, 411426, 411378, 29509, 295241, 4034051, 403388, 4034081, F16B 1904

Patent

active

058683569

ABSTRACT:
A biangular countersink in a skin panel to be joined to an underlying support member includes a frustoconical base portion defining a large included angle and an extremely shallow outer portion cut at a very small acute included angle. Fasteners usable with the countersink have heads with frustoconical undersides matching the deeper base portion of the countersink and rounded heads sized to fit within the shallow, acutely angled outer portion of the countersink. The combination of fastener and biangular countersink reduces annular grooves or "halos" which typically are formed around conventional flush head fasteners.

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