Patent ID: 8714277

Claim:
Tool for engagement in the ground including a holding portion for maneuvering an engagement portion during turning of the tool around an axis of rotation extending through the holding portion and the engagement portion, wherein the engagement portion has a plurality of cutting blades extending in directions from the holding portion and being distributed around the axis of rotation for pressing down into and engagement with the ground, said cutting blades each having a proximal end closes closest to the holding portion and a distal free end, at the greatest distance from the holding portion, wherein the cutting blades have a respective front edge, as seen in a turning direction when turning around the axis of rotation, for cutting action against the ground and a respective rear edge, wherein points on the front edges are positioned at a greater distance from the axis of rotation than points on the rear edges, and wherein the cutting blades are angled such that a distal portion of each rear edge is positioned in front of, as seen in the turning direction, and essentially at the same distance from the axis of rotation as a proximal portion thereof.