Vehicle with solicited carriage descent

Vehicle with solicited carriage descent

A vehicle (10) includes a vehicle frame (12), a vertical mast (14) coupled to the vehicle frame, and a carriage (16) movably mounted to the mast for ascending and descending along the mast. At least one hydraulic cylinder (30) moves the carriage along the mast, a hydraulic pump (32) pumps hydraulic...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: HEITMANN, ERRIC L, KIRK, JOHN B
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
HAULING
HOISTING
HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDEDFOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCEDIRECTLY TO THE SURFACE OF A LOAD
LIFTING
PERFORMING OPERATIONS
TRANSPORTING
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Beschreibung
Zusammenfassung:A vehicle (10) includes a vehicle frame (12), a vertical mast (14) coupled to the vehicle frame, and a carriage (16) movably mounted to the mast for ascending and descending along the mast. At least one hydraulic cylinder (30) moves the carriage along the mast, a hydraulic pump (32) pumps hydraulic fluid into the hydraulic cylinder, and a flow valve (36) controls the flow of hydraulic fluid between the hydraulic pump and the hydraulic cylinder. A sensor (22) senses an actual descent speed of the carriage and a controller controls the flow valve to allow descent of the carriage at a requested descent speed. The controller controls the flow valve to limit descent of the carriage to a unsolicited descent speed limit if a difference between the actual descent speed and the requested descent speed exceeds a threshold value.