Railway rolling stock – Special car bodies – Dumping
Patent
1993-02-02
1993-08-24
Le, Mark T.
Railway rolling stock
Special car bodies
Dumping
1052821, 1053081, 105293, 105296, 1053111, 105313, B61D 720
Patent
active
052379345
ABSTRACT:
The present invention is a control device that allows an operator to partially open a gate valve found at the bottom of a railway freight car hopper in order to obtain a sample of a flowable particulate or granular product contained within the hopper but preventing the gate valve from fully opening so as to partially unload the hopper. The device is provided with a rotatable operating shaft having attaching to it a structure for opening and closing the gate valve in response to rotation of the operating shaft. The operating shaft is provided with two ends that extend through end panels of the hopper. One of the two ends is provided with a lockable sample control handle and the second of the two ends is provided with an angled slot by which a lockable control handle movably attaches. The angled slot allows the operating shaft to be rotated when the control handle is locked closed by unlocking and turning the sample control handle. The limited rotation of the operating shaft allowed by the angled slot is sufficient to partially open the gate valve in order that the sample be obtained. However, the gate valve cannot open fully as long as the control handle is locked closed because the angled slot limits rotation of the operating shaft.
REFERENCES:
patent: 3561368 (1971-02-01), Giesking
patent: 4695207 (1987-09-01), Miller
patent: 5000358 (1991-03-01), Dugge
patent: 5060579 (1991-10-01), Johnson et al.
patent: 5115748 (1992-05-01), Westlake
Le Mark T.
Touchstone, Inc.
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