| 摘要 |
<p>A permanent electrical contact applicable to the web (1)of rails comprises a bush (2) in electrically conductive material having a tubular stem (3) suitable for inserting in a hole (4) in the web (1) of a rail, a flanged head (5) radially widened compared to the stem (3) and suitable for engaging in abutment with a portion surrounding the hole (4), and an axial through hole (8) in which a punch can be inserted to expand the tubular stem (3) radially and join a radially outer surface (15) of the stem (3) closely with the hole (4), wherein at least a portion of the outer surface (15) is substantially made of a first conductive metal and at least a portion of the flanged head (5) is substantially made of a second conductive metal different from the first conductive metal.</p> |
