Extruding and tapping screw and blank for manufacture of such sc

Details Extruding and tapping screw and blank for manufacture of such sc Extruding and tapping screw and blank for manufacture of such sc

1979-08-09

1981-05-26

Hunt, Brooks H.

Stock material or miscellaneous articles

All metal or with adjacent metals

Intermediate article

428583, 428585, F16B 2500

Patent

active

042699029

ABSTRACT:
A threaded fastener particularly designed for extruding and forming threads in a sheet metal material. A threaded shank region and threaded, generally, conical point region are interconnected by a thread forming and extruding region which includes a plurality of partially formed threads both in circumferential extent and depth of impression. The thread-forming region tapers downwardly toward the point region at an angle of about 6.degree. to maximize the thread-forming capabilities of the screw.

REFERENCES:
patent: 684774 (1901-10-01), Baggs
patent: 2167558 (1939-07-01), Upson
patent: 2703419 (1955-03-01), Barth
patent: 3180126 (1965-04-01), Carlson
patent: 3438299 (1969-04-01), Gutshall
patent: 3724315 (1973-04-01), Sygnaton
patent: 3752030 (1973-08-01), Steurer
patent: 3812639 (1974-05-01), Sygnator
patent: 4042342 (1977-08-01), Muenchinger

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