Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP12834576ApriorityCriticalpatent/JPS5355855A/en
Publication of JPS5355855ApublicationCriticalpatent/JPS5355855A/en
PURPOSE: To prevent a bucket from closing without load and falling freely to prevent it from occurring an accident by prohibiting to dispatch a close and upward command of a bucket by the erroneous operation of a controller when the bucket is in the air from the detected result of the hoist down speed of a supporting motor of a crane.
COPYRIGHT: (C)1978,JPO&Japio
JP12834576A1976-10-271976-10-27Device for controlling crane
PendingJPS5355855A
(en)