Title:
DEVICE FOR ADVANCING DRILLINGS IN THE GROUND
Document Type and Number:
WIPO Patent Application WO2004013449
Kind Code:
A3
Abstract:
Disclosed is a device for advancing drillings in the ground, comprising a rotatably driven main shaft (12) that is provided with a shaft cog (11), the axis (B) of which forms a sharp angle (w) along with the axis (A) of the main shaft (12), and an ear-type head (1) that is rotatably mounted about the axis (B) of the shaft cog (11) and is provided with a peripheral area (18) which runs along an opposite peripheral area (19). The inventive opposite peripheral area (19) can be made to rotate.
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Inventors:
MOHRMANN MICHAEL (DE)
Application Number:
PCT/EP2003/007810
Publication Date:
April 22, 2004
Filing Date:
July 18, 2003
Export Citation:
Assignee:
WIRTH CO KG MASCH BOHR (DE)
MOHRMANN MICHAEL (DE)
MOHRMANN MICHAEL (DE)
International Classes:
E21B4/00; E21B4/16; E21B10/00; E21B10/08; E21D9/087; E21D9/11; (IPC1-7): E21B4/00; E21B4/16; E21B10/08; E21D9/11
Foreign References:
| DE4332113A1 | 1995-03-23 | |||
| US4736987A | 1988-04-12 | |||
| EP0692612A2 | 1996-01-17 | |||
| JPH07324591A | 1995-12-12 | |||
| US4332420A | 1982-06-01 | |||
| US3963080A | 1976-06-15 | |||
| US4548443A | 1985-10-22 | |||
| US3383138A | 1968-05-14 | |||
| DE3416514A1 | 1985-11-07 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 04 30 April 1996 (1996-04-30)
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