Earth drilling device

Details Earth drilling device Earth drilling device

2009-04-17

2010-10-05

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

With tool drive prime mover or above-ground mechanical...

C213S205000, C213S209000

Reexamination Certificate

active

07806205

ABSTRACT:
An earth drilling device having a rotary drive and a drilling head connected to the rotary drive via a shaft is disclosed. The shaft runs at least partially axially along a pipe with two pipe ends, the first pipe end of which is connectable to a vacuum source and the second pipe end of which is provided with a pipe opening over which the drilling head at least partially projects. The drilling head is provided with at least two fillet sections connected to the shaft, which are attached to the shaft in radial extension and in projection along the axis of the pipe only partly cover the pipe opening. The fillet sections are each connected to an axially oriented surface section, which contacts the inner wall of the pipe in a gliding manner or contacts an inner wall of a sleeve coaxially connected to the second pipe end when the drilling head rotates. The axially oriented surface sections are each connected to a limb which axially projects over the pipe or the sleeve.

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