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
1983-03-15
1986-04-22
Dorner, Kenneth J.
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
411421, 408230, F16B 2500
Patent
active
045838984
ABSTRACT:
A self-drilling and self-tapping screw with a compound flute configuration having a straight portion including at least part of the cutting edge and a curved portion defining the drag surface. Generally convex point configurations having uniformly radiused heels or, alternatively, heels formed by two planar surfaces intersecting to enclose an obtuse angle less than 180 degrees are also disclosed. Fluting cutters and pointing cutters for making this screw as well as a general description of the method of making the screw have been set forth in the instant application.
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"How Much from Special Drill Shapes"; Oxford, Carl, Jr.--Modern Machine Shop; Oct. 1975, pp. 100-105.
"Holemaking Hangups? Drill Points Make the Difference"; Johnson, William A.;--Machine and Tool Blue Book, Jul. 1979, pp. 108-120.
Buckman Thomas W.
Dorner Kenneth J.
Illinois Tool Works Inc.
Roche David I.
Wilson Neill
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