Self-tapping screw for fastening a metal corrugated board

Details Self-tapping screw for fastening a metal corrugated board Self-tapping screw for fastening a metal corrugated board

1998-07-02

1999-06-08

Wilson, Neill

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

411399, 411413, F16B 2500, F16B 3504

Patent

active

059099925

ABSTRACT:
A self-tapping screw consists of a head and a threaded shank which is provided with a blade, a first threaded portion contiguous to the blade, and a second threaded portion contiguous to the head and greater in length, tooth pitch and tooth depth than the first threaded portion. The self-tapping screw is fastened onto a corrugated board such that the blade and the first threaded portion are securely embedded in a girder, and that the second threaded portion is securely embedded in an insulation layer located between the corrugated board and the girder.

REFERENCES:
patent: 4878793 (1989-11-01), Hewison
patent: 5433570 (1995-07-01), Koppel

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