(19)

(11)

EP 2 920 418 A2

(12)

(88) Date of publication A3: 05.03.2015 (43) Date of publication: 23.09.2015 Bulletin 2015/39 (21) Application number: 13799227.7 (22) Date of filing: 18.11.2013

(51) International Patent Classification (IPC):  E21D 20/00(2006.01) E21D 20/02(2006.01) (86) International application number: PCT/EP2013/074059 (87) International publication number: WO 2014/076274 (22.05.2014 Gazette 2014/21)

(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 Designated Extension States: BA ME (30) Priority: 19.11.2012 AU 2012905053 (71) Applicant: Sandvik Intellectual Property AB 811 81 Sandviken (SE)	(72) Inventors: COMORGE, Alain F-69740 Genas (FR) KOUHIA, Anssi FI-33840 Tampere (FI) RATAJ, Mieczyslaw Charlestown, New South Wales NSW 2290 (AU) MÄNTTÄRI, Maunu FI-37100 Nokia (FI)