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US 4,418,255 AGranted
Contact arrangement for air-blast switches with a tubular element of ferromagnetic material
AssigneeSiemens Aktiengesellschaft
InventorsRuediger Hess, Heiner Marin
Life of this patent
Estimating the term…
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.
Claims5
A contact arrangement for an air-blast switch comprising:
- a tubular first contact piece;
- a second contact piece axially associated with the first contact piece and positioned so that upon cutoff under load an arc is drawn between the contact pieces and subjected to a blast of compressed gas;
- the first contact piece including at its end face a nozzle body having a conical nozzle aperture contour that expands inwardly from the end face;
- at its interior a tubular element of ferromagnetic material having an inner wall surface;
- a layer of graphite disposed on said inner wall surface;
- and the tubular element being positioned adjacent the nozzle body so that the inner wall surface continues the contour of the nozzle of the aperture.
3 more elements
Dependencies are inferred from the claim text.