| 摘要 |
<p>The rivet is comprised of two main parts, a hollow rivet forming part (1) presenting a head and a shank whose extremity opposite to the extremity carrying the head comprises a hollow cylindrical recess provided in the cylindrical shank in the axial direction of the latter through at least one portion of the length of the cylindrical shank, and a mail forming part (2) comprising a hollow cylindrical shank which extends conically in order to form a point, the mail forming part being slipped on the cylindrical shank of the hollow rivet forming part up to a shoulder provided at the external surface of the cylindrical shank of the hollow rivet forming part; between the nail forming part and the hollow rivet forming part there is inserted, partially inside the recess of the hollow rivet part, a body which has a substantially conical external shape (3) and whose summit is oriented towards the head of the hollow rivet forming part.</p> |
