US 4,781,501 A · Self-plugging blind fastener

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.

Claims6

Dependent claims

A self-plugging blind fastener comprising:

a tubular body having an axial bore, and
an elongate stem disposed in said bore;
said bore including a main region and a locking region adjacent an end of the body, said locking region being of reduced diameter as compared with said main region,
said stem comprising a plug and, integrally connected to said plug, an elongate stem-tail which projects from said one end of the body,
said plug having means for engaging and deforming another end of said body to form a blind head,
said stem-tail extending through said locking region and including a plurality of swageable annular flanges;
at least one of said flanges being located within said locking region and swaged into interference with the body, thereby retaining the stem within the body, and
at least one further one of said swageable flanges being disposed in the main region of said bore and capable of being swaged into interference with the body when pulled into said locking region.

5 more elements

Dependencies are inferred from the claim text.

Self-plugging blind fastener

Life of this patent

Self-plugging blind fastener

Life of this patent

Abstract

Claims6