Composite fastener and method of manufacture
AssigneeNorthrop Corporation
InventorsNejat A. Olez, Flerida B. Uldrich
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Abstract
An essentially cylindrical, light weight, composite fastener formed of an interior cylindrical core member, a cone-shaped molded insert plug member in the first or head end of the core, and an exterior cup-shaped overwrap member. Threads are formed at the second or threaded end of the fastener. All of the components are fabricated of an organic resin material with high-modulus fibers embedded therein. The fibers of the exterior member are long and continuous while the fibers of the other members are short and chopped. All the fibers are essentially parallel with the axis of the fastener. The resin material is preferably polyetheretherketone and the fibers are preferably graphite. Also disclosed is the method of manufacturing the above described fastener.
Claims18
A composite fastener comprising:
- a first outer member formed in a cup-like shape from a resin composite material including a plurality of long high-modulus fibers embedded therein and arranged into a configuration extending over and intersecting each other across the bottom of said cup-like shape;
- and
- a second inner member formed in a cylindrical shape from a resin material with high-modulus fibers embedded therein, said second member being located within said first member.
An essentially cylindrical composite fastener having a first head end and a second threaded end including:
- an interior cylindrical core member formed from an organic resin material with short, chopped, high-modulus fibers embedded therein;
- an exterior member formed from strips consolidated into a star-shaped configuration and preformed into a cup-shaped configuration, said strips being formed from an organic resin material with long, continuous, high-modulus fibers embedded therein for the full lengths of the strips.
Dependencies are inferred from the claim text.