Hitachi, Ltd.

Ryohei Ishige

Yutaka Yoshida

Yasuo Nabeshima

Hiroaki Yabu

Kazuo Hatakeyama

A crane provided with traveling wheels disposed under a crane frame. The crane includes a hoisting accessory which is adapted to be hoisted by a hoist apparatus. AC motors are provided as travel motors for driving the traveling wheels as well as hoist motors for driving the hoist apparatus. The crane is equipped with a DC power source generating DC power, inverter units converting the DC power into AC power and outputting the AC power, and a change-over or switching arrangement for supplying the AC power to the travel motors when the crane is being moved and to the hoist motors during a hoisting operation of the hoisting accessory.

Crane and driving system therefor

A shed for storing containers in a three-dimensional system essentially including rails laid on the floor, a crane movably supported on the rails, an elevating member on the crane for vertical elevatory movement, a spreader frame mounted on the elevating member for movement in a horizontal direction, brackets on the spreader frame capable of moving vertically, twist lock pins each twistably attached to one of the brackets, three-dimensional shelves arranged on the floor along the rails, and guides located horizontally on each of the shelves. The spreader frame is thrust from the elevating member toward one of the shelves, and the brackets are moved downwardly on to a container on the shelf while supporting the spreader frame by guides mounted on the shelf, to bring the twist lock pins into engagement with the container. Then the brackets are moved upwardly to lift the container from the shelf and the spreader frame is returned to the elevating member to thereby remove the container from the shelf by the crane. A container can be placed on one of the shelves by the crane by reversing the process described above.

Container storage shed installation

An apparatus for controlling the running track of a trackless moving body comprising a guide wire, a position deviation sensor unit mounted on the trackless moving body for sensing a deviation of the position of the moving body relative to the guide wire, a steering control circuit connected to the position deviation sensor unit, and a steering drive unit connected to the steering control circuit for steering the moving body. The steering control circuit comprises a first-order lag circuit receiving the output signal from the position deviation sensor unit, a subtractor receiving the output signal from the position deviation sensor unit and the output signal from the first-order lag circuit, and a comparator receiving the output signal from the subtractor. In the steering control circuit, the output signal from the first-order lag circuit is subtracted in the subtractor from the output signal from the position deviation sensor unit so as to detect the rate of variation of position deviation during a predetermined period of time, and the subtractor output signal including the information of the rate of crane position deviation is compared in the comparator with a reference setting, so that the steering drive unit is actuated depending on the result of comparison for causing approaching movement of the moving body toward the guide wire.

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Kudamatsu, Japan

Ryohei Ishige