Method of manufacturing screw fasteners

Details Method of manufacturing screw fasteners Method of manufacturing screw fasteners

1987-05-22

1988-04-12

Combs, E. Michael

B21H 302, B21K 156

Patent

active

047364815

ABSTRACT:
A bi-metallic screw fastener blank for a self drilling and tapping screw and a process for making it are disclosed. The screw blank comprises a member made of a first material and has a head member and a shank member adjacent to the head to which is affixed by welding means a slug member made of a second hardenable material. After welding to the head member, the hardenable member leaves an annular groove at the weld interface having a diameter equal to the defined root diameter of the screw.

REFERENCES:
patent: 398912 (1889-03-01), Thomson
patent: 910434 (1909-01-01), Thompson
patent: 1262975 (1918-04-01), Pierce
patent: 1462775 (1923-07-01), Trivelloni
patent: 2153702 (1939-04-01), Tighe
patent: 2406327 (1946-08-01), Friedrich
patent: 2525258 (1950-10-01), Fabrizio
patent: 3611862 (1971-10-01), Walker
patent: 3924508 (1975-12-01), DeCaro

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