Self-counter-sinking screw with cutting receiving pockets

Details Self-counter-sinking screw with cutting receiving pockets Self-counter-sinking screw with cutting receiving pockets

1996-03-27

1997-11-04

Saether, Flemming

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Head having counter-sinking means

F16B 3506

Patent

active

056832176

ABSTRACT:
A self-countersinking screw including an inverted-conical head portion formed at a top with a cavity adapted to receive a tip of a screwdriver and having a conical bottom, said conical bottom having a plurality of triangular recesses each having a lateral side extending inwardly to form a sharp edge and a space for receiving chips, a threaded portion, and a tapered portion having a large diameter connected with the head portion and a small diameter connected with the threaded portion, whereby the sharp edge will make a countersink on a workpiece when the countersunk head screw is turned therein.

REFERENCES:
patent: 298427 (1884-05-01), Stone
patent: 466463 (1892-01-01), Holland
patent: 1894708 (1933-01-01), Sardenson
patent: 3903784 (1975-09-01), Dekker
patent: 4572720 (1986-02-01), Rockenfeller
patent: 4697969 (1987-10-01), Sparkes
patent: 5203657 (1993-04-01), Nagoshi et al.
patent: 5249882 (1993-10-01), Nagoshi et al.

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