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
1979-05-21
1982-01-19
Britts, Ramon S.
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
F16B 2500
Patent
active
043114237
ABSTRACT:
A hole-drilling, extruding and thread-forming sheet screw comprises an inverted pyramidal hole-drilling section with cutting edges, an inverted, truncated-pyramidal extruding section integral with the hole-drilling section, and a cylindrical thread-forming section with male threads integral with the extruding section. The extruding section includes four substantially vertically extending flat side surfaces and four substantially vertically extending ridges, each of which provides a smooth, curved surface gradually and progressively increasing in its radius and arcuate length as it extends upwardly, so that the curved surface can serve as an active surface for smoothly enlarging a hole drilled in a workpiece and forcibly deforming metal around the hole to form a desired tubular extrusion with the workpiece.
REFERENCES:
patent: 88539 (1869-04-01), Bocking
patent: 551354 (1895-12-01), Lee
patent: 1485202 (1924-02-01), Rosenberg
patent: 2703419 (1955-03-01), Barth
patent: 3093028 (1963-06-01), Mathie
patent: 3357295 (1967-12-01), Smith
patent: 3438299 (1969-04-01), Gutshall
patent: 3682038 (1972-08-01), Lejdegard
patent: 3724315 (1973-04-01), Sygnator
patent: 4068554 (1978-01-01), Hirabayashi
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