(19)

(11)

EP 2 010 749 A1

(12)

(43) Date of publication: 07.01.2009 Bulletin 2009/02 (21) Application number: 07748032.5 (22) Date of filing: 18.04.2007

(51) International Patent Classification (IPC):  E21B 19/24(2006.01) (86) International application number: PCT/SE2007/000367 (87) International publication number: WO 2007/123460 (01.11.2007 Gazette 2007/44)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 21.04.2006 SE 0600880 (71) Applicant: Atlas Copco Rock Drills AB 701 91 Örebro (SE)	(72) Inventor: ORGÅRD, Jonas 860 13 Stöde (SE) (74) Representative: Janson, Ronny  Ehrner & Delmar Patentbyrå AB Box 10316 100 55 Stockholm 100 55 Stockholm (SE)