Hydro-pneumatic cushioning device

Details Hydro-pneumatic cushioning device Hydro-pneumatic cushioning device

1994-06-10

1996-01-30

Oberleitner, Robert J.

Railway draft appliances

Cushioned

Springs

188287, B61G 900

Patent

active

054874807

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.

REFERENCES:
patent: 1534059 (1925-04-01), Dennett
patent: 1935741 (1933-11-01), Gunn
patent: 2011460 (1935-08-01), Snyder
patent: 3584331 (1971-06-01), Hooge
patent: 3589528 (1971-06-01), Stephenson
patent: 3791534 (1974-02-01), Stephenson
patent: 3854596 (1974-12-01), Stephenson et al.
patent: 3864922 (1975-02-01), Dial et al.
patent: 4838392 (1989-06-01), Miller et al.
patent: 5025938 (1991-06-01), Bomgardner et al.

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