Patent ID: 7739812
Filing Date: 2010-06-22
Classification: E02F

Abstract:
1. A cutter head for a cutter suction dredger intended to be mounted rotatably about a cutter head center axis with respect to a suction device for sucking up material which has been cut loose by the cutter head from the bottom of a body of water, which cutter head comprises a base ring, a boss located at a distance from the base ring in the direction of the center axis, as well as a plurality of arms which extend from the base ring to the boss and are distributed at regular intervals in the peripheral direction, each of which arms has a series of teeth located on radially outermost parts of the arm and directed outwards at an angle with respect to the peripheral direction, the direction of rotation of the cutter head being set in such a manner that the teeth perform a cutting movement, wherein non-return means extend between at least two neighboring arms, which non-return means prevent a movement of the cut material from the center axis to the exterior, wherein the non-return means are attached to a surface of an arm, which surface is turned radially outwards with respect to the center axis, and are displaceable between a position where they interact with and a position where they do not interact with a surface of a neighboring arm, which surface is turned radially inwards with respect to the center axis.