(19)

(11)

EP 2 627 851 A1

(12)

(43) Date of publication: 21.08.2013 Bulletin 2013/34 (21) Application number: 11832179.3 (22) Date of filing: 14.10.2011

(51) International Patent Classification (IPC):  E21B 7/20(2006.01) E21B 17/046(2006.01) E21B 10/40(2006.01) E21B 17/14(2006.01) E21B 6/00(2006.01) E21B 10/64(2006.01) (86) International application number: PCT/FI2011/000042 (87) International publication number: WO 2012/049353 (19.04.2012 Gazette 2012/16)

(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: 15.10.2010 FI 20100349 (71) Applicant: Robit Rocktools LTD. 33880 Lempäälä (FI)	(72) Inventors: MATTILA, Mikko FI-33 800 Tampere (FI) KORTE, Pasi FI-37500 Lempäälä (FI) (74) Representative: Nieminen, Taisto Tapani  Patenttitoimisto T. Nieminen Oy P.O. Box 65 33201 Tampere 33201 Tampere (FI)