EP 3819458 A1 20210512 - STRENGTHENED PERCUSSIVE DRILL STRING FEMALE COUPLING
Title (en)
STRENGTHENED PERCUSSIVE DRILL STRING FEMALE COUPLING
Title (de)
VERSTÄRKTE BUCHSENKOPPLUNG FÜR SCHLAGBOHRGESTÄNGE
Title (fr)
COUPLAGE FEMELLE DE TRAIN DE FORAGE À PERCUSSION RENFORCÉ
Publication
Application
Priority
EP 19208106 A 20191108
Abstract (en)
The present invention relates to a drill string for percussive drilling comprising having a first elongate percussive drill rod comprising a main section and an externally threaded male end and a second elongate percussive drill rod comprising a main section and an internally threaded mounting sleeve. The male end and female ends overlap to form a coupling region and a thread clearance area is formed adjacent to the end most female thread. The mounting sleeve has a first region having a first outer skirt diameter, D<sub>1</sub>, at the axially rearward end and a second outer skirt diameter, D<sub>2</sub>, along part of the axial length between the axially rearward end and the main section forming a strengthened region wherein D<sub>2</sub> is greater than D<sub>1</sub>.
IPC 8 full level
E21B 17/042 (2006.01)
CPC (source: EP KR)
E21B 17/0426 (2013.01 - EP KR)
Citation (applicant)
- US 4332502 A 19820601 - WORMALD PHILIP J, et al
- US 4398756 A 19830816 - DURET JEAN [FR], et al
- US 4687368 A 19870818 - EKLOF AANGSTROEM KE T [SE], et al
- DE 2800887 A1 19780713 - PADLEY & VENABLES LTD
- EP 1511911 B1 20141119 - ATLAS COPCO SECOROC AB [SE]
Citation (search report)
- [A] EP 2845993 A1 20150311 - SANDVIK INTELLECTUAL PROPERTY [SE]
- [A] WO 2019206484 A1 20191031 - KROLL PETER [US], et al
- [A] EP 2710217 A1 20140326 - ATLAS COPCO SECOROC AB [SE]
- [A] US 3485271 A 19691223 - HALSEY GEORGE H
- [A] US 4509777 A 19850409 - WALKER JAMES M [US]
Designated contracting state (EPC)
AL 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 RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3819458 A1 20210512; EP 3819458 B1 20221019; KR 20220092588 A 20220701; WO 2021089727 A1 20210514
DOCDB simple family (application)
EP 19208106 A 20191108; EP 2020081180 W 20201105; KR 20227018577 A 20201105