(19)

(11)

EP 3 198 118 A1

(12)

(43) Date of publication: 02.08.2017 Bulletin 2017/31 (21) Application number: 15848259.6 (22) Date of filing: 22.09.2015

(51) International Patent Classification (IPC):  E21D 21/00(2006.01) (86) International application number: PCT/SE2015/050985 (87) International publication number: WO 2016/056973 (14.04.2016 Gazette 2016/15)

(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 Designated Extension States: BA ME Designated Validation States: MA (30) Priority: 25.09.2014 SE 1451130 (71) Applicant: Northern Mining Products AB 977 75 Luleå (SE)	(72) Inventors: KREKULA, Håkan S-981 35 Kiruna (SE) ERIKSSON, Leif S-981 35 Kiruna (SE) (74) Representative: Zacco Sweden AB  P.O. Box 5581 114 85 Stockholm 114 85 Stockholm (SE)