The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 1985
Filed:
Mar. 14, 1983
Robert T Fischer, Homewood, IL (US);
Merle D Wahlstrom, South Holland, IL (US);
Miner Enterprises, Inc., Geneva, IL (US);
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.