Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc.
Patent
1987-01-28
1989-04-25
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
411383, 411395, 411424, 411479, 411901, 411908, F16B 3500
Patent
active
048243140
ABSTRACT:
A method of forming a lightweight threaded fastener element of bimaterial construction to high tolerance requirements, the element formed by the steps of shaping a metal shell to a preliminary configuration blank by extrusion, filling the extruded shell with a less dense material such as a curable epoxy-graphite material or an aluminum-lithium alloy, further shaping the filled blank by forging both the core material and shell to an intermediate configuration which is finished by warm rolling to form a strong lightweight fastener element configured with the metal shell thereof which may be engageable with a cooperating metal fastener assembly member.
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"Tool and Die Journal" Jul. 1944, pp. 196,198,200.
Anderson Terry J.
Block Robert B.
Dino Suzanne L.
Northrop Corporation
Smith Gary L.
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