Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Pilot end having means enhancing fastening or installation
Patent
1985-01-17
1989-06-06
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Pilot end having means enhancing fastening or installation
411417, F16B 2500
Patent
active
048367303
ABSTRACT:
A drilling and thread forming fastener is provided having a threaded shank and a pilot end. The fastener pilot end in cross section has a major and minor axis intersecting at the fastener center of rotation. A pair of arcuate flutes are disposed in opposed quadrants from a pair of arcuate lands, each of said arcuate flutes and an arcuate land intersecting on the major axis to form a cutting edge of the fastener, the two cutting edges being disposed in a plane containing the center of rotation of the fastener.
The fastener construction is adaptable to applications in relatively thick materials including cement or cinder block, and is effective to increase tool life when manufactured by a forging process.
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Arnold Larry J.
Jesson George
Dino Suzanne L.
Emhart Industries Inc.
Smith Gary L.
Szatkowski Thomas S.
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