EP 1769131 A1 20070404 - DRILL HEAD FOR A GROUND-BORING DEVICE
Title (en)
DRILL HEAD FOR A GROUND-BORING DEVICE
Title (de)
BOHRKOPF FÜR EIN ERDBOHRGERÄT
Title (fr)
TETE DE FORAGE D'UN ENGIN A FORER LE SOL
Publication
Application
Priority
- EP 2005007286 W 20050706
- DE 102004032551 A 20040706
- DE 102005031707 A 20050705
Abstract (en)
[origin: WO2006002997A1] The invention relates to a drill head for a ground-boring device that displaces earth on impact. Said drill head comprises at least three drill head sections (3, 4, 11). The first drill head section is provided with a shape that is optimized for loosening and guiding the device while the second section is optimized regarding radial displacement of the ground at a low resistance to movement and the third section is provided with a fixed connection to the housing of the ground-boring device. In order to obtain improved transmission of advancing forces to the ground and thus improved advancement of the ground-boring device, at least two of the drill head sections are embodied so as to be movable relative to each other along the longitudinal axis thereof.
IPC 8 full level
E21B 7/26 (2006.01); E21B 4/06 (2006.01); E21B 4/14 (2006.01)
CPC (source: EP US)
E21B 4/145 (2013.01 - EP); E21B 7/046 (2013.01 - EP US); E21B 7/26 (2013.01 - EP US)
Citation (search report)
See references of WO 2006002997A1
Designated contracting state (EPC)
FR GB
DOCDB simple family (publication)
WO 2006002997 A1 20060112; AU 2005259407 A1 20060112; AU 2005259407 B2 20100909; EP 1769131 A1 20070404; EP 1769131 B1 20111116; US 2009211812 A1 20090827; US 7938205 B2 20110510
DOCDB simple family (application)
EP 2005007286 W 20050706; AU 2005259407 A 20050706; EP 05772195 A 20050706; US 57175105 A 20050706