Patent ID: 8851395
Filing Date: 2014-10-07
Classification: H01R,Y10T

Abstract:
1. Method for applying a permanent electrical contact to a hole of a metal wall portion, particularly of a railway rail web or a tubular profile, comprising the steps of: providing a bush with a tubular stem having a distal end and a proximal end, providing a punch having an elongate shaft with a distal end and a proximal end, an enlarged expansion portion arranged near the distal end of the shaft and a connecting portion arranged near the proximal end of the shaft, providing a pulling device having a distal abutment portion and a pulling mechanism with a pull connector adapted to engage the connecting portion of the punch and to pull it proximally with respect to the abutment portion, inserting the punch in a passage hole of the tubular stem of the bush so that the connecting portion protrudes proximally from the proximal end of the tubular stem and the expansion portion is located at the distal end of the tubular stem, connecting the connecting portion of the punch to the pull connector of the pulling device to connect the preassembled bush punch unit with the pulling device, inserting the preassembled bush punch unit from a proximal side of the wall portion distally in the hole, activating the pulling mechanism of the pulling device to pull the punch with its expansion portion proximally through the passage hole of the tubular stem, while the distal abutment portion pushes in stationary relationship in a distal direction against the proximal end of the bush, thereby radially expanding the tubular stem and permanently anchoring the bush in the hole.