Invention Grant
US07658244B2 Device for advancing drillings in the ground 失效
用于在地面上推进钻孔的装置

Device for advancing drillings in the ground
Abstract:
A device for driving boreholes in the ground, having a rotationally driven main shaft with a shaft journal whose axis (B) forms an acute angle with respect to the axis (A) of the main shaft. A drill head is mounted such that it can rotate about the axis (B) of the shaft journal and has a circumferential region which runs on a complementary circumferential region, wherein the complementary circumferential region can be set rotating.
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