(19)

(11)

EP 2 396 497 A1

(12)

(43) Date of publication: 21.12.2011 Bulletin 2011/51 (21) Application number: 10740972.4 (22) Date of filing: 11.02.2010

(51) International Patent Classification (IPC):  E21B 19/24(2006.01) E21B 19/16(2006.01) (86) International application number: PCT/FI2010/050090 (87) International publication number: WO 2010/092237 (19.08.2010 Gazette 2010/33)

(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 (30) Priority: 12.02.2009 FI 20095134 (71) Applicant: Sandvik Mining and Construction Oy 33330 Tampere (FI)	(72) Inventors: PIIPPONEN, Juha FI-33330 Tampere (FI) KERÄNEN, Sami FI-33330 Tampere (FI) (74) Representative: Kuosmanen, Timo  Kolster Oy Ab Iso Roobertinkatu 23 P.O. Box 148 00121 Helsinki 00121 Helsinki (FI)