Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1999-01-13
2000-08-29
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
411403, 4113877, 411424, F16B 2300, F16B 2500, F16B 3506
Patent
active
061098515
ABSTRACT:
A carbon steel screw has one or more portions which have been selectively hardened by selective heat treatment and quenching. In one embodiment, an upper portion of the screw head is selectively hardened to prevent or reduce damage when torque is applied using a driving tool. In another embodiment, the screw tip is selectively hardened for more effective penetration into a substrate. Preferably, the selectively heated portions are selectively quenched to reduce or avoid distortion.
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Marketing brochure of Elco Industries, Inc., entitled "DRIL-FLEX, A New Concept In Structural Fastening", dated Feb. 1989.
Bauer Mark D.
Hasan S. Riaz U L
Spring William A.
Starozhitsky Michael
Illinois Tool Works Inc.
Wilson Neill
LandOfFree
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