EP 2268888 A2 20110105 - GRIP HEAD FOR AN EARTH BORING UNIT
Title (en)
GRIP HEAD FOR AN EARTH BORING UNIT
Title (de)
SPANNKOPF FÜR EINE ERDBOHRANLAGE
Title (fr)
TÊTE DE SERRAGE POUR UN DISPOSITIF DE FORAGE DE TERRAIN
Publication
Application
Priority
- EP 2009003100 W 20090429
- DE 102008021491 A 20080429
Abstract (en)
[origin: WO2009132831A2] The invention relates to a grip head for an earth boring unit, comprising a hollow shaft (3), wherein a sleeve (1) is arranged coaxially on the hollow shaft (3) to slide relative thereto, said sleeve having at least one end region (1b) widening particularly at the bottom thereof particularly in the form of a cone and at least two clamp jaws (2) which can be displaced radially relative to the hollow shaft (3) are arranged in the hollow shaft (3) and/or on the sleeve (1), comprising stop faces (2b) cooperating with the widening end region (1b), such that on movement of the end region (1b) over the clamp jaws (2) said jaws may be pressed inwards and a first tensioning mechanism and form a first tensioning device for an upper end of a casing (9) which may be introduced from below into the sleeve, in particular such that a cooperation between clamp jaws (2) and casing (9) permits transmission of a torque between ween the hollow shaft (3) and casing (9) and a second tensioning mechanism is provided in the hollow shaft (3), by means of which the introduced / introducible casing (9) may be fixed at the upper rend region thereof in the axial direction, in particular fixing a casing (9) in the axial direction against gravity relative to the grip head, wherein a flush tube (14) of supplying a flushing fluid is arranged coaxially in the hollow shaft (3) and fixed in rotation relative thereto the lower region of which is enclosed by an annular balloon (11) which may be pumped up with a fluid, in particular a liquid.
IPC 8 full level
E21B 19/07 (2006.01)
CPC (source: EP US)
E21B 3/02 (2013.01 - EP US); E21B 7/20 (2013.01 - EP US); E21B 19/07 (2013.01 - EP US); E21B 21/106 (2013.01 - EP US)
Citation (search report)
See references of WO 2009132831A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA RS
DOCDB simple family (publication)
DE 102008021491 A1 20091105; CN 102037207 A 20110427; EP 2268888 A2 20110105; US 2011114391 A1 20110519; WO 2009132831 A2 20091105; WO 2009132831 A3 20101209
DOCDB simple family (application)
DE 102008021491 A 20080429; CN 200980114570 A 20090429; EP 09737875 A 20090429; EP 2009003100 W 20090429; US 91829009 A 20090429