(19)

(11)

EP 2 118 434 A1

(12)

(43) Date of publication: 18.11.2009 Bulletin 2009/47 (21) Application number: 08705223.9 (22) Date of filing: 21.01.2008

(51) International Patent Classification (IPC):  E21B 21/02(2006.01) E21B 21/00(2006.01) (86) International application number: PCT/SE2008/000050 (87) International publication number: WO 2008/100193 (21.08.2008 Gazette 2008/34)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR (30) Priority: 14.02.2007 SE 0700365 (71) Applicant: Atlas Copco Rock Drills AB 701 91 Örebro (SE)	(72) Inventor: ÖSTLING, Thomas S-633 58 Eskilstuna (SE) (74) Representative: Hagström, Lena  Valea AB Sveavägen 24 103 87 Stockholm 103 87 Stockholm (SE)