(19)

(11)

EP 1 601 854 A1

(12)

(43) Date of publication: 07.12.2005 Bulletin 2005/49 (21) Application number: 04713564.5 (22) Date of filing: 23.02.2004

(51) International Patent Classification (IPC)7: E21B 19/086, E21B 45/00 (86) International application number: PCT/FI2004/000083 (87) International publication number: WO 2004/074626 (02.09.2004 Gazette 2004/36)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 21.02.2003 FI 20030264 (71) Applicant: Sandvik Tamrock Oy 33330 Tampere (FI)	(72) Inventor: PIIPPONEN, Juha FI-33240 Tampere (FI) (74) Representative: Kaukonen, Juha Veikko  Kolster Oy Ab, Iso Roobertinkatu 23, P.O. Box 148 00121 Helsinki 00121 Helsinki (FI)