RAILCAR CUSHIONING DEVICE
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United States of America Patent
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Issued Date -
Aug 29, 2013
app pub date -
Feb 29, 2012
filing date -
Feb 29, 2012
priority date (Note) -
Abandoned
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Abstract
A railcar cushioning device has a hydraulic cylinder holding pressurized fluid. The cylinder has a cylinder body with an inner chamber and a reservoir chamber. A piston is movably positioned in the inner chamber. The cylinder body has a bleed opening allowing bleed flow from the inner chamber to the reservoir chamber. A bleed orifice valve in the bleed opening has a valve housing and a poppet received in the valve housing that moves to allow and restrict fluid flow through a bleed flow path based on the pressure of the fluid. The poppet has an orifice channel allowing a restricted fluid flow through the valve housing when the pressure in the inner chamber is greater than the pressure in the reservoir chamber.
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