Tamper-proof railroad hopper car door operating system

Details Tamper-proof railroad hopper car door operating system Tamper-proof railroad hopper car door operating system

1983-03-14

1985-09-24

Reeves, Robert B.

Railway rolling stock

Special car bodies

Dumping

105289, 105308R, 91461, B61D 700, F15B 1304

Patent

active

045427011

ABSTRACT:
A tamper-proof railroad hopper car door operating system for preventing operation of the doors when the auxiliary train line air pressure, and thus the locomotive engine, is removed. A directional control valve is provided through which air pressure is switched from the car reservoir pressure tank to control a door operating air cylinder. The control valve includes a pilot inlet connected to the auxiliary train line for supplying air pressure to switch the control valve, while the reservoir air pressure flows through the valve to supply the power medium for the air cylinder. In this manner when the auxiliary train line air pressure is removed, reservoir air pressure cannot be switched to move the hopper car door.

REFERENCES:
patent: 1481787 (1924-01-01), Benbow
patent: 3178886 (1965-04-01), Watson
patent: 3654837 (1972-04-01), Knapp
patent: 3828948 (1974-08-01), Peterson
patent: 3877394 (1975-04-01), Schmeling
NOPAK Publication, "Fluid Power Handbook", Dec. 1980.
Wabco Publication of Valve Types, Sep. 1981.
Miner Enterprises Brochure on AUTOMEC, "Air Cylinder Operated Mechanism . . . ", (undated).
Miner Enterprises Brochure on AUTOMEC, "Ideal for New Coal Cars . . . ", (undated).
Progressive Railroading Publication, "Quick Release Coal Car", Mar. 1982.

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