(19)

(11)

EP 3 924 557 A1

(12)

(43) Date of publication: 22.12.2021 Bulletin 2021/51 (21) Application number: 19915511.0 (22) Date of filing: 27.09.2019

(51) International Patent Classification (IPC):  E02D 29/14(2006.01) E03F 5/06(2006.01) (52) Cooperative Patent Classification (CPC): E02D 29/1427 (86) International application number: PCT/SE2019/050937 (87) International publication number: WO 2020/167181 (20.08.2020 Gazette 2020/34)

(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: KH MA MD TN (30) Priority: 12.02.2019 SE 1930054 (71) Applicant: Tierps Järnbruk AB 81540 Tierp (SE)	(72) Inventors: KARLSSON, Tomas 81591 Tierp (SE) LOKANDER, Petter 81592 Tierp (SE)