Patent ID: 9142894
Filing Date: 2015-09-22
Classification: B21D,B21J,B21K,E01B,H01R

Abstract:
1. Permanent electrical contact applicable to the web of rails and the like, comprising a bush in electrically conductive material having a tubular stem insertable in a hole in the web of a rail, a flanged head radially widened compared to the stem and suitable for engaging in abutment with a portion surrounding the hole, and an axial through hole in which a punch can be inserted to expand the tubular stem radially and join a radially outer surface of the stem closely with the hole, wherein at least a portion of the outer surface of the stem is substantially made of a first conductive metal and at least a portion of the flanged head is substantially made of a second conductive metal different from the first conductive metal, wherein the bush consists of a double layer tubular body having an outer layer substantially made from the first conductive metal and an inner layer substantially made from the second conductive metal, the inner layer and the outer layer of the tubular body being metallurgically bonded.