Method of making a stem for a self-plugging blind fastener

Details Method of making a stem for a self-plugging blind fastener Method of making a stem for a self-plugging blind fastener

1987-07-28

1988-08-23

Combs, E. Michael

72377, B21K 144, B21K 158

Patent

active

047650109

ABSTRACT:
A self-plugging blind fastener of the break-stem type, is suitable for fastening apertured sheets together, and comprises a headed tubular body and an elongate stem disposed in the bore of the body. The stem comprises a plug, and a stem-tail connected to the plug by a breakneck which is concealed by overlapping lips. The plug has a stop face, and an annular locking groove between the breakneck and the stop face. The body has a deformable locking collar upstanding above an adjacent region of the upper surface of the head. The diameter of the bore reduces, to provide a stop face and a locking region of smaller diameter, within the head. The fastener is set by pulling the plug into the bore until the stop faces meet, to form a blind head, and then deforming the collar to force the body to bulge into the locking groove of the plug.

REFERENCES:
patent: 3044332 (1962-07-01), Siebol
patent: 3073205 (1963-01-01), Siebol
patent: 3292482 (1966-12-01), Fry et al.
patent: 3390601 (1968-07-01), Summerlin
patent: 4230017 (1980-10-01), Angelosanto
patent: 4365495 (1982-12-01), Francis
patent: 4627775 (1986-12-01), Dixon

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