Hiab Ab

Cargotec Patenter Ab

Lars Rydahl

Per Gustafsson

Sten Siren

Sten Sirén

Erik Nylander

Mats Lindström

Jan Mikaelsson

A hydraulic crane comprising: &#x2014;a rotatable column (); &#x2014;a crane boom system () comprising two or more liftable and lowerable crane booms (); and &#x2014;an electronic control device (), 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.

Hydraulic crane

A stabilizer leg arrangement with a stabilizer leg (), which is extensible by a hydraulic cylinder () into a supporting position in contact with the ground. A piston () divides the internal space of the hydraulic cylinder into first and second chambers (), wherein these chambers are configured to come into fluid communication with each other through a flow channel () in the hydraulic cylinder when the piston reaches an advanced end position and abuts against a stop surface. An electronic control device () is configured to establish information as to whether or not the stabilizer leg is in the supporting position while taking into account a measuring value (V) related to the hydraulic pressure in the first chamber (). The invention also relates to a corresponding method and a mobile working machine comprising such a stabilizer leg arrangement.

Stabilizer leg arrangement and method for detecting whether or not a stabilizer leg is in supporting contact with the ground

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Hudiksvall, Sweden

Lars Rydahl