Patent ID: 7775300
Filing Date: 2010-08-17
Classification: E21B

Abstract:
1. Earth drilling device comprising: an auger, a rotary drive for driving at least the auger in a rotating about a drilling axis, an encasing tube which surrounds the auger, for conveying therethrough drill spoil stripped by the auger towards the rotary drive in the upward direction, an ejecting device for discharging the drill spoil conveyed upwardly through the encasing tube by the auger, wherein the ejecting device has an upper end arranged at the upper end of the encasing tube and a discharge duct of adjustable length along a vertical axis parallel to the drilling axis and constructed for receiving the drill spoil conveyed upwardly through the encasing tube by the auger and guiding the drill spoil to the ground, wherein the discharge duct is movable relative to the upper end of the ejecting device, a mast element, along which the auger is movable together with the ejecting device, a device for changing the length of the discharge duct, and a lifting device for moving the discharge duct relative to the upper end of the ejecting device.