Abstract
A crane for loading and unloading a cargo includes a trolley assembly. The trolley assembly includes a first trolley movable in a longitudinal direction along a boom of the crane; a second trolley movable in a lateral direction on the first trolley; a hoist provided on the second trolley; a spreader movable in a vertical direction by the hoist; a light emitting unit provided on the spreader; and a smart camera for capturing an image of the light emitting unit to measure a movement of the spreader. A movement of the hoist is controlled by a location control unit based on the measured movement of the spreader.
Original language | English |
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IPC | B66C 13/ 22 A I |
Patent number | US2011272376 |
Country/Territory | United States |
Priority date | 10/05/2010 |
Priority number | KR20100043419 |
Publication status | Published - 10 Nov 2011 |