Patent ID: 8453765

Claim:
A directional-control apparatus for a drilling tool, the directional-control apparatus comprising: a centre axis; an intermediate housing, wherein at least one steering body fits into a respective bore in the intermediate housing being adjustable in a radial direction relative to the intermediate housing and against a wall of a borehole, the at least one steering body, at an end portion facing the centre axis, being supported on an outer eccentric sleeve which is rotatably supported on an inner eccentric sleeve which is rotatably supported on a mandrel; a first electrically operated actuator for rotation of the outer eccentric sleeve; and a second electrically operated actuator for rotation of the inner eccentric sleeve and the outer eccentric sleeve, wherein the drilling tool is steered in a desired direction and at a desired deflection, wherein the at least one steering body is provided with a hook which projects axially relative to the centre axis and into a groove in the outer eccentric sleeve.