Abstract: 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.

Abstract: 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.

Abstract: 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.