| 摘要 |
PROBLEM TO BE SOLVED: To prevent interference between a hook and a taking-up rope for lifting the hook and a hydraulic cylinder for lifting a crawler side frame at the time of crane operation.SOLUTION: A cylinder housing device is a device that swings a hydraulic cylinder 160 that is suspended on a belly surface side of a lower boom 140 for swinging, between a housing posture for arrangement along a belly surface of the lower boom 140 and a use posture for arrangement in vertical direction. The cylinder housing device includes a guide part 171 which engages with a rod tip end of the hydraulic cylinder 160 for guiding the rod tip end according to expanding/contracting operation of a rod 162 of the hydraulic cylinder 160. Relating to the cylinder housing device, when the rod 162 of the hydraulic cylinder 160 which is in the use posture is contracted by a specified amount, the tip end of the hydraulic cylinder 160 is guided by the guide part 171 so that the hydraulic cylinder 160 comes into the housing posture, and when the hydraulic cylinder 160 in the housing posture is expanded by a specified amount, engagement between the guide part 171 and the tip end of the hydraulic cylinder 160 is released, and the hydraulic cylinder 160 comes into the use posture. |
