Slab-sided self-tapping screw

Details Slab-sided self-tapping screw Slab-sided self-tapping screw

1974-10-07

1976-03-09

Britts, Ramon S.

10152T, F16B 3302

Patent

active

039424065

ABSTRACT:
A self-tapping fastener and method of manufacture wherein said fastener is provided with a unique tapping section, in addition to a driving head and an intermediate threaded portion of generally conventional design. The tapping section is defined by a plurality of interrupted thread turns of an asymmetrical configuration. Each turn includes a pair of diametrically opposed lobe portions, with a pair of opposed side portions disposed intermediate said lobes. One said side portion is defined by a complete absence or void of material provided by a gap of controlled dimensions, while the other is provided by a thread form of an incomplete or under-filled configuration. The fastener of the invention is fabricated by rolling a specially designed blank between a pair of standard thread rolling dies.

REFERENCES:
patent: 2347360 (1944-04-01), Muenchinger
patent: 2350346 (1944-06-01), Gaskell
patent: 2703419 (1955-03-01), Barth
patent: 3492908 (1970-02-01), Thurston

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