Patent · US Expired

Contact arrangement for air-blast switches with a tubular element of ferromagnetic material

US4418255A · kind A · utility

2Cited by

3References

5Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Ruediger Hess · Berlin, DE
Heiner Marin · Berlin, DE

Key dates

Filing date	Oct 22, 1981
Grant date	Nov 29, 1983
Priority date	—
Expiry date	Oct 22, 2001

Classification

Technology area (CPC H)Electricity
CPC primaryH01H33/7053
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In a contact arrangement for air-blast switches, a tubular element consisting of ferromagnetic material (the inner wall surface of which is conical and continues the contour of a nozzle aperture) is provided with a layer of graphite. The layer is formed by one or more bushings which are force fitted into the tubular element. The desired conical inner contour can be produced by machining initially cylindrical inner surfaces after mounting the bushings within the tubular element.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.