Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1979-11-19
1982-07-06
Britts, Ramon S.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
29407, 411 8, 411389, F16B 3500
Patent
active
043380549
ABSTRACT:
A metal fastener characterized by a sharp yield point and improved elongation beyond the yield point and a tensile strength (force) at least as large as the specified minimum for the grade, size, and threads of said metal fastener, which metal fastener has a nominal diameter D and comprises: one or more externally threaded components having threads of nominal diameter D with a stress area A.sub.s ; a nonthreaded shank component having a diameter D.sub.s equal to or substantially equal to the nominal diameter D extending axially with the threaded components; the shank component characterized by a reduced portion of axial length L.sub.r, the reduced portion having an axially transverse cross-sectional area A.sub.r sufficiently less than the stress area A.sub.s of the threaded components along substantially the axial length L.sub.r, whereby, on tightening of the metal fastener to failure the failure occurs in the reduced portion of the shank component; and means with the reduced portion, extending substantially the axial length L.sub.r, to align the reduced portion of the metal fastener in a passageway in which the metal fastener is to be employed.
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Britts Ramon S.
Crowley Richard P.
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