Railway car cushioning device

Details Railway car cushioning device Railway car cushioning device

1976-03-03

1977-08-09

Hoffman, Drayton E.

Railway draft appliances

Cushioned

Springs

188282, 213 43, 213223, B61G 908

Patent

active

040405230

ABSTRACT:
An end-of-car hydraulic pneumatic cushioning device for connecting to the coupler of a railway car having a piston mounted within a cylinder and a piston rod secured to the piston extending rearwardly from the cylinder. The piston divides the cylinder into a front high pressure chamber and a rear low pressure chamber, and a gaseous and liquid fluid mixture is provided in both the high and low pressure chambers. The piston carries normally closed metering valves which open in buff travel a buff flow passage between the low and high pressure chambers after around two inches or more of buff travel from neutral extended position, and open upon return draft travel after buff travel a restricted draft flow passage between the low and high pressure chambers. The gas in the fluid mixture particularly upon high velocity impact loads is dispersed throughout the liquid and thus has a large contact area with the liquid to minimize the increase in temperature of the gas upon being compressed.

REFERENCES:
patent: 1434024 (1922-10-01), Ree
patent: 3596773 (1971-08-01), Peterson
patent: 3596774 (1971-08-01), MacCurdy
patent: 3731771 (1973-05-01), Borgo
patent: 3826343 (1974-07-01), Heymann

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