Patent ID: 8181842
Filing Date: 2012-05-22
Classification: H01H

Abstract:
1. A device comprising: an end cover brazed onto a cylindrical body, said end cover comprising a circular peripheral rim brazed onto a part of an end surface of the cylindrical body, wherein said cover comprises a first part outside an interior of the cylindrical body and offset from the end surface of the cylindrical body and a second part within the interior of the cylindrical body, said first and second parts extending around a longitudinal axis of the cylindrical body wherein the circular peripheral rim of the cover exerts compressive stress on at least one third of the end surface of the cylindrical body after brazing, the first part comprises a first portion extending substantially perpendicular to the longitudinal axis of the cylindrical body and comprises an outer wall of the cover, and the second part comprises a second portion extending substantially perpendicular to the longitudinal axis of the cylindrical body and comprises an inner wall of the cover, and the distance between a plane defined by a top surface of the second portion and a plane defined by the end surface of the cylindrical body is greater than 6 mm, and the distance between a plane defined by a bottom surface of the first portion and a plane defined by the end surface of the cylindrical body is between 0.5 mm and 2 mm.