Self-drilling screw

Details Self-drilling screw Self-drilling screw

1995-05-22

1997-01-28

Larson, Lowell A.

Threaded, headed fastener, or washer making: process and apparat

Process

Making externally threaded fastener, e.g., screw or bolt

B21H 302

Patent

active

055973574

ABSTRACT:
A self-drilling screw is provided which is suitable for use with both relatively thick metal plates and relatively thin metal sheets. The screw is formed from a blank 1 which includes a shank 2 extending between a head 3 and drilling tip 4. The shank 2, adjacent the head 3, is formed with a frusto-conical enlargement 8. A thread 10, when formed in shank 2, is extended into enlargement 8 so as to create a final part 11 of the thread which, in use of the screw with sheet metal 12, distorts the sheet metal such that it firmly locks onto the enlargement 8. A shallow recess 6 is provided in the underside of head 3 surrounding the frusto-conical enlargement 8.

REFERENCES:
patent: 3661046 (1972-05-01), Waud et al.
patent: 3812639 (1974-05-01), Sygnator
patent: 4516893 (1985-05-01), Barth
patent: 4749319 (1988-06-01), Sygnator
patent: 4764066 (1988-08-01), Terrell et al.
patent: 4781506 (1988-11-01), Roberts et al.
patent: 5356253 (1994-10-01), Whitesell

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