EP 2252763 A1 20101124 - CLAMPING HEAD FOR AN EARTH-DRILLING SYSTEM
Title (en)
CLAMPING HEAD FOR AN EARTH-DRILLING SYSTEM
Title (de)
SPANNKOPF FÜR EINE ERDBOHRANLAGE
Title (fr)
TÊTE DE SERRAGE POUR UNE INSTALLATION DE FORAGE DU SOL
Publication
Application
Priority
- EP 2009001414 W 20090227
- DE 102008012729 A 20080305
Abstract (en)
[origin: US2011260480A1] The invention relates to a clamping head for an earth-drilling system comprising a hollow shaft (3) through which a drill pipe (9) can be guided, wherein a sleeve (1) is arranged coaxially on the hollow shaft (3) in such a way that it can move relative thereto, said sleeve having at least one widening end region (1b), in particular a downwardly widening end region which particularly widens in a conical shape, and wherein at least two clamping jaws (2) which can move radially with respect to the hollow shaft (3) are mounted in the hollow shaft (3) and/or on the sleeve (1), said clamping jaws being provided at their radially outer end with run-on surfaces (2b) interacting with the widening end region (1b), such that the clamping jaws (2) can be pressed radially inward as a result of the end region (1b) sliding over them and form a first clamping mechanism for a drill pipe (9), in particular such that a torque can be transmitted between the hollow shaft (3) and drill pipe (9) as a result of an interaction between the clamping jaws (2) and drill pipe (9), wherein a second clamping mechanism is provided in the hollow shaft (3) and can be used to secure a drill pipe (9) in the axial direction, in particular in order to draw a drill pipe (9) from the ground in the axial direction.
IPC 8 full level
E21B 19/07 (2006.01); E21B 19/16 (2006.01)
CPC (source: EP US)
E21B 19/07 (2013.01 - EP US); E21B 19/161 (2013.01 - EP US)
Citation (search report)
See references of WO 2009109336A1
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)
US 2011260480 A1 20111027; AT E540193 T1 20120115; CN 101978131 A 20110216; DE 102008012729 A1 20090910; EP 2252763 A1 20101124; EP 2252763 B1 20120104; WO 2009109336 A1 20090911
DOCDB simple family (application)
US 91823409 A 20090227; AT 09716504 T 20090227; CN 200980107734 A 20090227; DE 102008012729 A 20080305; EP 09716504 A 20090227; EP 2009001414 W 20090227