Drill and thread forming screw

Details Drill and thread forming screw Drill and thread forming screw

1981-06-01

1984-10-16

Scanlan, Jr., Richard 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

F16B 2500

Patent

active

044772173

ABSTRACT:
A drilling and thread forming screw including a shank portion with a head at one end and a drill point at the other end. The shank includes a threaded portion having a minor diameter and a major diameter. The drill point defines a segment of a cone having a base and a point. The base intersects the shank at the minor diameter of the shank. This screw is adapted to drill into a substrate up to the minor diameter of the shank and then to form female threads in the substrate.

REFERENCES:
patent: 2015159 (1935-09-01), Rosenberg
patent: 3093028 (1963-06-01), Mathie
patent: 3221588 (1965-12-01), Wieber
patent: 3682038 (1972-08-01), Lejdegard
patent: 3882756 (1975-05-01), Sauer et al.

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