LIFTING DEVICE

LIFTING DEVICE

PROBLEM TO BE SOLVED: To increase the reliability of a function for preventing a hydraulic cylinder from lowering unexpectedly in a lifting device for lifting or lowering an object to be loaded and unloaded using the hydraulic cylinder as a driving source. SOLUTION: In this lifting device, a first f...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: ODAGUCHI TSUTOMU
Format: Patent
Sprache:eng
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:PROBLEM TO BE SOLVED: To increase the reliability of a function for preventing a hydraulic cylinder from lowering unexpectedly in a lifting device for lifting or lowering an object to be loaded and unloaded using the hydraulic cylinder as a driving source. SOLUTION: In this lifting device, a first flow meter 23 is provided on a hydraulic cylinder 12 side across a hydraulic hose 19, and a second flow meter 24 is provided on a hydraulic source device 13 side. This lifting device is constituted to switch a first electromagnetic selector valve 21 provided between the hydraulic cylinder 12 and the hydraulic hose 19 to a check valve 21b side if difference in measured flow rate occurs between the first flow meter 23 and the second flow meter 24 when the hydraulic cylinder 12 lowers. Consequently, if the hydraulic hose 19 is broken, flowing-out of hydraulic fluid from the hydraulic cylinder 12 is prevented to prevent unexpected lowering operation. COPYRIGHT: (C)2005,JPO&NCIPI