Self-extruding fastener

Details Self-extruding fastener Self-extruding fastener

1979-02-26

1980-12-30

Britts, Ramon S.

F16B 2500

Patent

active

042416388

ABSTRACT:
A self-extruding fastener having a head provided with a cross groove, a stem having two screw threads and a tapering portion terminating at a sharp pointed forward end adapted to form a guide opening in a thin sheet of metal. A third screw thread generates in a position midway between said two screw threads and in a portion where the stem ends and the tapering portion begins, and extends to the pointed forward end, while the two screw threads disappear in the tapering portion. Therefore, the self-extruding fastener according to the invention comprises three sections, that is, two screw thread section, three screw thread section and one screw thread section.

REFERENCES:
patent: 1749903 (1930-03-01), Cannon
patent: 1802668 (1931-04-01), Newton
patent: 2314391 (1943-03-01), DeVellier
patent: 3277769 (1966-10-01), Lippmeier
patent: 3541918 (1970-11-01), Johnson
patent: 3942405 (1976-03-01), Wagner
patent: 4027573 (1977-06-01), Laverty

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