Blind fastener for composite materials

Details Blind fastener for composite materials Blind fastener for composite materials

1981-01-29

1983-03-15

Holko, Thomas J.

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

Having separate expander means

Bulged by axially contracting ends

411 44, 411 54, 411 70, F16B 1304

Patent

active

043766048

ABSTRACT:
A blind fastener particularly suited for mechanically joining composite structures such as graphite and fiber/epoxy matrix with a minimum of blind side damage. A first sleeve of highly ductile material is disposed as a liner about the portion of the nut which passes through the composite materials. The first sleeve extends longer than the thickness of the materials. A second sleeve of measurably less ductility is disposed between the first sleeve and the head of the threaded corebolt. The two sleeves have abutting surfaces which are non-sliding whereby as the nut and corebolt are threadily engaged and the two sleeves are brought into compression, the less ductile sleeve flairs the more ductile sleeve about the nut to create a protected area about the blind side of the materials.

REFERENCES:
patent: 1695303 (1928-12-01), Tomkinson
patent: 2341598 (1944-02-01), Crowley
patent: 3129630 (1964-04-01), Wing et al.
patent: 4033222 (1977-07-01), Wilson
patent: 4142439 (1979-03-01), Landt

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