Provided is an automatic boom extension/contraction device for a work machine in which it is possible to reduce the burden, such as arm or hand fatigue, on a worker inputting an operation for extending or contracting a boom when the worker actuates the boom so as to extend or contact. When, in a state in which an automatic extension/contraction switch (53) is ON, an engine rotation speed equal to or greater than a first predetermined rotation speed (R1) is detected by an engine rotation speed sensor (51) and an operation in which the speed of extension/contraction actuation of a boom (22) is equal to or greater than a predetermined speed is inputted through a boom extension/contraction lever (52), an automatic extension/contraction actuation is performed in which the extension/contraction actuation of the boom (22) is maintained in a state in which an operation of extending/contacting the boom (22) is not inputted through the boom extension/contraction lever (52).
AUTOMATIC BOOM TELESCOPIC MOTION APPARATUS FOR WORKING MACHINE
AUTOMATISCHE TELESKOPISCHE AUSLEGERBEWEGUNGSVORRICHTUNG FÜR ARBEITSMASCHINE
DISPOSITIF D'EXTENSION/RÉTRACTION AUTOMATIQUE DE FLÈCHE POUR MACHINE DE TRAVAIL
2019-09-18
Patent
Elektronische Ressource
Englisch
IPC: | B66C Krane , CRANES |
Automatic boom telescopic motion apparatus for working machine
Europäisches Patentamt | 2018
|AUTOMATIC BOOM TELESCOPIC MOTION APPARATUS FOR WORKING MACHINE
Europäisches Patentamt | 2017
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