Patent ID: 8499911

Claim:
A power supply system for a crane in which a crane for loading and unloading a container for marine transportation is linked to a power supply truck for supplying power while following the crane, with a linkage mechanism, the power supply system characterized in that the linkage mechanism includes: a receiving member disposed on the power supply truck; and a pushing member disposed on the crane, and the power supply system includes the linkage mechanism configured in a manner that, when the crane moves in a travel direction, the pushing member comes into contact with the receiving member to transmit a force of the crane moving in the travel direction to the power supply truck, when the crane moves in a transverse direction intersecting the travel direction, the receiving member does not disturb move of the pushing member, and thus a force of the crane moving in the transverse direction is not transmitted to the power supply truck, and when the crane is displaced in a vertical direction, the receiving member does not disturb move of the pushing member, and thus a force of the crane moving in the vertical direction is not transmitted to the power supply truck.