Rail road car truck and fitting therefor
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United States of America Patent
Stats
-
Oct 25, 2016
Grant Date -
Apr 24, 2014
app pub date -
Dec 31, 2013
filing date -
Jul 8, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A rail road freight car truck has a truck bolster mounted transversely to a side frame pair. A mounting interface between the axel ends and the sideframe pedestals allows lateral swing truck like rocking motion of the sideframes combined with a longitudinal selfsteering capability by use of a longitudinally oriented rocker that permits resistance to deflection proportionally to the weight carried across the interface. The truck may have auxiliary centering elements made of resilient elastomeric material mounted in the pedestal seats and may also have friction dampers provided with brake linings or like on the face engaging the sideframe columns, on the slope face, having a disinclination to stick-slip behavior and operate to yield upward and downward friction forces that are not overly unequal and may be mounted in a four-cornered arrangement at each end of the truck bolster. Spring groups may include subgroups of springs of differing heights.
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