(19)

(11)

EP 2 324 199 A1

(12)

(43) Date of publication: 25.05.2011 Bulletin 2011/21 (21) Application number: 09812746.7 (22) Date of filing: 10.09.2009

(51) International Patent Classification (IPC):  E21C 37/00(2006.01) E02F 3/96(2006.01) E21B 7/02(2006.01) (86) International application number: PCT/FI2009/050726 (87) International publication number: WO 2010/029220 (18.03.2010 Gazette 2010/11)

(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 MK MT NL NO PL PT RO SE SI SK SM TR Designated Extension States: AL BA RS (30) Priority: 15.09.2008 FI 20085864 (71) Applicant: Sandvik Mining and Construction Oy 33330 Tampere (FI)	(72) Inventor: LAHDELMA, Ilkka FI-33330 Tampere (FI) (74) Representative: Kuosmanen, Timo  Kolster Oy Ab P.O. Box 148 Iso Roobertinkatu 23 00121 Helsinki 00121 Helsinki (FI)