All metal self-locking screw fastener

Details All metal self-locking screw fastener All metal self-locking screw fastener

1974-06-24

1978-05-23

Britts, Ramon S.

Brushing, scrubbing, and general cleaning

F16B 39284

Patent

active

040905446

ABSTRACT:
An externally screw threaded fastener body is bored longitudinally to form a bore having a reduced inner axial portion and an outer axial portion of enlarged diameter and a noncircular mandrel is forced into the bore to expand the reduced inner portion thereof and thereby form at least one radially outwardly protruding lobe for local increase in the pitch diameter of the external screw thread. The fastener body may then again be drilled longitudinally, the final result being a fastener, at least a portion of which is tubular with a relatively thin resilient circumferential wall having at least one radially outward lobe.

REFERENCES:
patent: 2869607 (1959-01-01), Widmann
patent: 3027042 (1962-03-01), Graves
patent: 3212547 (1965-10-01), McKay et al.
patent: 3249142 (1966-05-01), Phipard
patent: 3358726 (1967-12-01), Gabbey
patent: 3426642 (1969-02-01), Phipard
patent: 3479675 (1969-11-01), Ricca
patent: 3643722 (1972-02-01), Oestericher

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