Abstract: The invention relates to a clamping head for an earth-drilling system comprising a hollow shaft (3) through which a drill pipe (9) can be guided, wherein a sleeve (1) is arranged coaxially on the hollow shaft (3) in such a way that it can move relative thereto, said sleeve having at least one widening end region (1b), in particular a downwardly widening end region which particularly widens in a conical shape, and wherein at least two clamping jaws (2) which can move radially with respect to the hollow shaft (3) are mounted in the hollow shaft (3) and/or on the sleeve (1), said clamping jaws being provided at their radially outer end with run-on surfaces (2b) interacting with the widening end region (1b), such that the clamping jaws (2) can be pressed radially inward as a result of the end region (1b) sliding over them and form a first clamping mechanism for a drill pipe (9), in particular such that a torque can be transmitted between the hollow shaft (3) and drill pipe (9) as a result of an interaction betwee

Abstract: The invention relates to a grip head for an earth boring unit, comprising a hollow shaft (3), wherein a sleeve (1) is arranged coaxially on the hollow shaft (3) to slide relative thereto, said sleeve having at least one end region (1b) widening particularly at the bottom thereof particularly in the form of a cone and at least two clamp jaws (2) which can be displaced radially relative to the hollow shaft (3) are arranged in the hollow shaft (3) and/or on the sleeve (1), comprising stop faces (2b) cooperating with the widening end region (1b), such that on movement of the end region (1b) over the clamp jaws (2) said jaws may be pressed inwards and a first tensioning mechanism and form a first tensioning device for an upper end of a casing (9) which may be introduced from below into the sleeve, in particular such that a cooperation between clamp jaws (2) and casing (9) permits transmission of a torque between ween the hollow shaft (3) and casing (9) and a second tensioning mechanism is provided in the hollow sh