(19)

(11)

EP 2 137 373 A1

(12)

(43) Date of publication: 30.12.2009 Bulletin 2009/53 (21) Application number: 08709297.9 (22) Date of filing: 30.01.2008

(51) International Patent Classification (IPC):  E21B 17/18(2006.01) E21B 17/10(2006.01) E21B 10/60(2006.01) E21B 21/12(2006.01) (86) International application number: PCT/FI2008/050028 (87) International publication number: WO 2008/092994 (07.08.2008 Gazette 2008/32)

(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: 01.02.2007 FI 20075066 (71) Applicant: Sandvik Mining and Construction Oy 33330 Tampere (FI)	(72) Inventors: KATAJA, Aulis FI-33340 Tampere (FI) KALLIOMÄKI, Jorma FI-33230 Tampere (FI) BOURNAZOS, Ioannis GR-19014 Mikrohori Kadandriti (GR) (74) Representative: Kaukonen, Juha Veikko  Kolster Oy Ab Iso Roobertinkatu 23 P.O. Box 148 00121 Helsinki 00121 Helsinki (FI)