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1. (WO2017186549) HYDRAULIC CRANE

Pub. No.:    WO/2017/186549    International Application No.:    PCT/EP2017/059323
Publication Date: Fri Nov 03 00:59:59 CET 2017 International Filing Date: Fri Apr 21 01:59:59 CEST 2017
IPC: B66C 23/90
Applicants: CARGOTEC PATENTER AB
Inventors: SIRÉN, Sten
GUSTAFSSON, Per
RYDAHL, Lars
Title: HYDRAULIC CRANE
Abstract:
A hydraulic crane comprising: - a rotatable column (7); - a crane boom system (10) comprising two or more liftable and lowerable crane booms (11, 13); and - an electronic control device (25), which is configured to prevent an execution of crane boom movements that would make the lifting moment of the crane exceed the maximum allowed lifting moment of the crane, and to continuously establish position information as to the prevailing position of the load suspension point (P) of the crane boom system. When the lifting moment of the crane has reached a limit value at a given level below the maximum allowed lifting moment, the electronic control device is configured to prevent the execution of any combination of crane boom movements that would increase the horizontal distance between the load suspension point and said vertical axis of rotation and at the same time allow the execution of any combination of crane boom movements that keeps said horizontal distance unchanged or reduces said horizontal distance.