(19)

(11)

EP 2 751 368 A1

(12)

(43) Date of publication: 09.07.2014 Bulletin 2014/28 (21) Application number: 12838275.1 (22) Date of filing: 04.10.2012

(51) International Patent Classification (IPC):  E21B 4/06(2006.01) (86) International application number: PCT/FI2012/050954 (87) International publication number: WO 2013/050657 (11.04.2013 Gazette 2013/15)

(84) Designated Contracting States: AL 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 RS SE SI SK SM TR (30) Priority: 06.10.2011 FI 20115980 (71) Applicant: Sandvik Mining and Construction Oy 33330 Tampere (FI)	(72) Inventors: LEPPÄNEN, Jarmo FI-33330 Tampere (FI) KESKINIVA, Markku FI-34130 Ylinen (FI) HEDLUND, Juha FI-33330 Tampere (FI) (74) Representative: Kolster Oy Ab  Iso Roobertinkatu 23 PO Box 148 00121 Helsinki 00121 Helsinki (FI)