Drilling assembly

Abstract

The invention relates to a drilling assembly for earth or rock drilling, comprising an inner rod, which comprises, at its distal end facing the ground, an inner drilling tool for removing ground material, and which can be connected, at its proximal end, to a rotary drive for the transmitting a drilling torque, a tubular outer rod, which surrounds the inner rod and comprises, at its distal end, an annular drill bit for removing ground material, and an impact unit, which is arranged on the inner rod in the region of the distal end and is configured to exert axially directed impacts on the inner drilling tool, wherein, in the region of the distal end, a radial connecting apparatus is arranged and configured between the inner rod and the outer rod, which connecting apparatus allows torque to be transmitted from the rotationally driven inner rod to the drill bit of the outer rod. According to the invention, it is provided that a telescopic connecting unit is arranged on the inner rod and is configured to allow torque to be transmitted between the distal end of the inner rod and the proximal end of the inner rod, and to allow axial displacement between the distal end of the inner rod and the proximal end of the inner rod.

Dependencies are inferred from the claim text.