Valve closure for railway car cushioning device

Details Valve closure for railway car cushioning device Valve closure for railway car cushioning device

1977-09-16

1978-09-12

Blix, Trygve M.

Railway draft appliances

Cushioned

Springs

B61G 902

Patent

active

041131134

ABSTRACT:
An end-of-car railway car cushioning unit has a cylinder and a cylindrical piston mounted in the cylinder with the piston rod secured to the piston extending through an opening in the rear end of the cylinder with the piston forming a high pressure fluid chamber on the front face thereof and a low pressure fluid chamber on the rear face thereof. The piston has a plurality of openings therethrough and a metering valve is mounted in each of the openings to meter fluid flow between the low pressure chamber and the high pressure chamber. Each metering valve has a buff flow passage and a restricted draft flow passage. At least one selected metering valve has a cylindrical extension thereon projecting from the front face of the piston and adapted to engage an end wall of the high pressure chamber as the piston approaches the end of its buff stroke to block the flow of fluid from the high pressure chamber to the associated metering valve adjacent the end of the buff stroke. The extension is mounted for a limited inward movement upon contact with the end wall forming the cylinder to permit movement of the piston after such contact. The metering valves having the closure extension thereon are set to open at a lower force level than the remaining metering valves and a high force level is thus required for additional buff travel after the closure extension contacts the cylinder end wall.

REFERENCES:
patent: 1445615 (1923-02-01), Ferres
patent: 3596773 (1971-08-01), Peterson
patent: 3826343 (1974-07-01), Heymann
patent: 4040523 (1977-08-01), Carle et al.

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