B - Operations – Transporting – 61 – D
Patent
B - Operations, Transporting
61
D
105/153
B61D 7/00 (2006.01)
Patent
CA 1228769
ABSTRACT OF THE DISCLOSURE 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.
487320
Fischer Robert T.
Wahlstrom Merle D.
Mcfadden Fincham
Miner Enterprises Inc.
LandOfFree
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