| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently ensure a foot operation while preventing interference between a bucket and a cabin as much as possible when an interference area is widely set in the front. SOLUTION: In a corner part on the front and lower side of a contact area B formed by an area front surface B1 serving as a front limitation of the contact area B and an area lower surface B2 serving as a lower limit of the contact area B, an exception area C of a right triangle seen from the side taking the area front surface B1 as a vertical side and the area lower surface B2 as the base is set under a-fixed condition. When an arm top pin 8 is within the above exception area C, a contact prevention function is canceled and actions of boom raising, arm pulling and left offset are permitted in a decelerating state. An alarm 24 is simultaneously operated. COPYRIGHT: (C)2009,JPO&INPIT
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