| 摘要 |
In a corner part on the front and lower side of a contact area between a bucket and a cabin formed by an area front surface serving as a front limitation of the contact area and an area lower surface serving as a lower limit of the contact area, an exception area of a right triangle seen from the side taking the area front surface as a vertical side and the area lower surface as the base is set under a fixed condition. When an arm top pin is within the above exception area, a contact prevention function is cancelled and actions of boom raising, arm pulling and left offset are permitted in a decelerating state.
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