(19)

(11)

EP 1 463 868 A1

(12)

(43) Date of publication: 06.10.2004 Bulletin 2004/41 (21) Application number: 02786339.8 (22) Date of filing: 10.12.2002

(51) International Patent Classification (IPC)7: E21B 4/06 (86) International application number: PCT/SE2002/002276 (87) International publication number: WO 2003/062586 (31.07.2003 Gazette 2003/31)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR Designated Extension States: AL LT LV MK RO (30) Priority: 21.12.2001 SE 0104377 (71) Applicant: Atlas Copco Secoroc AB 737 25 Fagersta (SE)	(72) Inventors: STJERNSTRÖM, KARL, AXEL S-737 43 FAGERSTA (SE) GREIJER, Thomas S-737 43 FAGERSTA (SE) (74) Representative: Karlström, Lennart et al Noréns Patentbyra AB,Box 10198 100 55 Stockholm 100 55 Stockholm (SE)