Electricity: transmission to vehicles – Conductors – Third rail
Patent
1993-04-20
1993-11-23
Huppert, Michael S.
Electricity: transmission to vehicles
Conductors
Third rail
191 22DM, B60M 130
Patent
active
052635619
ABSTRACT:
In accordance with the present invention, a power conductor rail structure is provided using a multi-metallic construction. The composite rail of the invention includes an asymmetrical steel portion having a top flange thickness greater than that of the bottom flange in a generally I-shaped configuration with spaced apertures along the length of the web. Aluminum cladding is cast onto both sides of the web with a cold rolled high conductivity layer, such as copper disposed between the aluminum and steel on either side of the web and having holes corresponding in size and shape to the apertures of the web. The aluminum cladding extends through the web apertures producing a multi-metallic sandwich construction. The high conductivity layers provide a mechanical bond between the steel and aluminum and reduces transfer resistance and increasing overall conductivity. In an alternative embodiment of the invention, the top flange is formed with openings with the aluminum cladding filling the openings so that the aluminum cladding forms part of the electrical contact surface.
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Huppert Michael S.
Inesscon Inc.
Lowe Scott L.
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