| 摘要 |
<p>The fastener assembly comprises a fastener having an elongate shank with a pointed end and having a head, the shank defining an axis and having two portions of different diameters, namely a thicker portion adjoining the head and a thinner portion adjoining the pointed end, the shank having a shoulder joining the thicker and thinner portion. There is a polymeric sleeve disposed around the elongate shank, the sleeve having an initial, axially measure length, which the sleeve assumes when disposed around the shank but not compressed axially, the sleeve having a critical, axially measured length, at which the sleeve splits when disposed around the shank and compressed axially. The thicker portion of the shank has an axial length between the initial and critical lengths of the sleeve.</p> |
