Chip breaker screws

Details Chip breaker screws Chip breaker screws

1979-09-21

1981-10-20

Britts, Ramon S.

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

408227, F16B 2500

Patent

active

042957680

ABSTRACT:
A drilling and thread forming screw is provided with means for breaking the chips produced during the drilling process. An obstruction in the form of a truncated cylindrical element having its flat end portion substantially facing the cutting edge of the cutting surface and having its cylindrical centerline perpendicular to the cutting edge is provided on the cutting surface whereby a chip formed by the drilling process is turned back into a sharp radius, causing the chip to break.

REFERENCES:
patent: 1638230 (1927-08-01), Alsaker
patent: 2322894 (1943-06-01), Stevens
patent: 2404048 (1946-07-01), Gepfert
patent: 2479730 (1949-08-01), Dewar
patent: 2769355 (1956-11-01), Crisp
patent: 2966081 (1960-12-01), Kallio
patent: 2981127 (1961-04-01), Ransom
patent: 3786713 (1974-01-01), Sygnator
patent: 3789725 (1974-02-01), Lindstrom
patent: 4147088 (1979-04-01), Whittaker, Jr.

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