| 摘要 |
PURPOSE:To enhance the safety by folding a boom and an arm for accommodation of a bucket at the side of a cabin, and returning the bucket automatically to the accommodation position with maneuvering of a control lever to the accommodation side. CONSTITUTION:When the offset prohibited area as a hazardous area is approached, a boom solenoid proportional valve 37 and an arm solenoid proportional valve 38 are switched over to the port on the opposite side to operation of a manual control valve so as to stop rotation, when an offset solenoid proportional valve 39 is solely turned on. Then the level of a bucket 1 is checked to know whether or not the level is over the setting given by a bucket level setting switch 34. When an arm control lever 9a or a boom control lever is tuned fully, the proportional valve 39 is actuated to cause commencement of automatic return of bucket 1 to the accommodation position. When the bucket 1 is restituted to the standard position, the proportional valve 39 is switched over to the neutral. |
