Hydro-pneumatic cushioning device
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United States of America Patent
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-
Jan 30, 1996
Grant Date -
N/A
app pub date -
Jun 10, 1994
filing date -
Jun 10, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An end-of-car coupler includes a hydro-pneumatic cushioning device. The latter has a ported tube separating the hydraulic cylinder chamber from an outer annular chamber containing gas. Each port is fitted with a valve, the obturating member of each valve being a differential area piston. The valves are all closed until subjected to a certain threshold force by movement of the plunger in the cylinder when all those valves between the plunger and the end of the cylinder chamber open to allow liquid flow between the two chambers.
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