Patent ID: 9476181
Filing Date: 2016-10-25
CPC Classification: E02F

Claim Text:
1. A drag head of a trailing suction hopper dredger, comprising a visor which is dragged over a bottom in a dragging direction and herein loosens soil, and a suction conduit which connects to the visor and which discharges the loosened soil, wherein the bottom comprises a rock bottom, and wherein the drag head is further provided with cutting bodies for loosening the soil, wherein the cutting bodies comprise conical bits each having a top with a radius of curvature between 1 and 100 mm, wherein the conical bits form at least one series which extends along a straight line substantially perpendicular to the dragging direction, wherein each of the at least one series comprises at least 15 conical bits, the conical bits being configured to draw furrows in the rock bottom in the dragging direction, wherein a part of the bottom situated between the furrows is broken into chips which are readily suctioned up by the suction conduit.