| 摘要 |
PROBLEM TO BE SOLVED: To provide a telescopic boom mechanism for a crane device, which has a simple structure and can reduce a swivel range of a rear side of a rotating superstructure.SOLUTION: A telescopic boom mechanism for a crane device comprises a passage switching valve 35b that switches a passage of hydraulic fluid supplied via a hydraulic hose 35a to a cylinder/boom connection switching cylinder 32b side or to a boom connection switching cylinder 34b side, a hose reel 35c for unwinding the hydraulic hose 35a according to the extension movement of an extension cylinder 31 and winding the hydraulic hose 35a according to the contraction movement, a cable 37 for supplying power from the rotating superstructure side to a solenoid that drives the passage switching valve 35b and transmitting signals from a proximity switch 36 to the rotating superstructure side, and a cord reel 37a for unwinding the cable 37 according to the extension movement of the extension cylinder 31 and winding the cable 37 according to the contraction movement. The hose reel 35c and the cord reel 37a are arranged in the boom extension/contraction direction of the rotating superstructure with respect to one another. |
