| 摘要 |
A self-plugging blind fastener suitable for fastening apertured sheets together, and of the type comprising a body having a shank, headed at one end, and an axial bore in which is disposed an elongate stem which, in use, is pulled to expand the shank and lock part of the stem in the body, has an improvement for locking the stem in the body. The head end of the bore is of reduced diameter and presents a stop-shoulder. The stop-shoulder is an annular skirt partly separated from surrounding material by an annular cleavage, and presents a planar stop-face facing away from the head-end. The stem comprises a plug which is connected by a breakneck to a stem-tail for pulling the plug into the bore of the body. The plug has an annular locking recess spaced from the breakneck, and is radially enlarged on the side of the locking recess remote from the breakneck to provide a plug-shoulder and shank-enlarging means. The plug-shoulder presents a planar face for engaging the stop face of the body and deforming the annular skirt into the locking recess during setting of the fastener.
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