Abstract: A cutter wheel for a dredging apparatus mounted for rotation about a shaft and having outwardly projecting cutting blades mounted on openings formed in the cylindrical peripheral plane of said wheel, while a stationary suction mouth is provided inside said wheel which is adapted for being in fluid communication with the cutting blades on rotation of said wheel, said suction mouth being connected to said shaft so that it may be rotated by means of a piston-cylinder assembly to change its angular position.

Abstract: A device for raising and lowering a load while preventing swinging of the load comprising a container bridge having a displaceable trolley thereon, the trolley carrying a drum for hoisting cables which pass over sheaves to the load for raising and lowering the load by wind-up and pay-out of the cables. In order to prevent swinging of the load, a positioning wire extends from a drum on the trolley to the load at an oblique inclination which forms an angle with respect to the hoisting cables.

Abstract: A container loading and unloading device is described wherein containers are raised along a substantially vertical path, thereafter displaced along a horizontal path and finally lowered along a vertical path. The device comprises at least one horizontal girder supported by a frame; at least two hoists disposed for raising and lowering of the containers, the hoists being supported by and movable over the girder and operatively positioned a distance from each other; and at least one substantially horizontally extending continuous conveyor for the horizontal displacement of the containers. Such conveyor is situated between the hoists and includes a support for at least one container and means for displacing such support and container placed thereon along a horizontal path from a point near one hoist to a point near the other.