| 摘要 |
<P>PROBLEM TO BE SOLVED: To change a lane smoothly by maintaining lighting of a HID (High Intensity Discharge) lamp when switching between a ground power feeding and on-board power feeding. <P>SOLUTION: A portal type crane device 10 lifts and lowers a container in an optional lane in a container yard by driving motors 30 to 32, and includes: a power feeding switcher 1S switchingly selecting and outputting either of an AC power fed from a bus bar 8 extended along the lane, and an AC power generated by a self-device; the HID lamp 35 lighting the surrounding area of the crane device; and an inverter inverting the AC power that is output from the power feeding switcher 1S into a DC current and again inverting it into a AC current for the supply to the HID lamp 35. <P>COPYRIGHT: (C)2013,JPO&INPIT |
