Railroad car with brake system which applies less braking when empty than when loaded
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United States of America Patent
Stats
-
May 2, 1989
Issued Date -
N/A
app pub date -
May 20, 1988
filing date -
Nov 6, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A railroad freight car comprising a freight-carrying first elongated body supported at one end by a first truck and at the other end by a second truck; each truck having a plurality of wheels and carrying air pressure operated braking apparatus for braking the wheels; the air pressure operated braking apparatus on the first truck including a pressurized air line having an air pressure sensor/changeover valve which governs the braking pressure applied only to the wheels of the first truck; the first truck having a bolster, spring-supported at each end by wheel-containing side frames, whereby the bolster is lowered relative to the frame when the elongated body condition varies from empty to loaded; a base mounting the air pressure sensor/changeover valve to the bolster; and, the valve having an arm responsive to change in height of the bolster relative to the frame to decrease the air pressure to the brake apparatus from a high pressure, when the elongated body is loaded, to a lower pressure when the elongated body has an empty load condition to thereby apply a predetermined high braking force to the wheels when the elongated body is loaded and apply a decreased or lower braking force to the wheels when an empty condition exists.
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