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(11)

EP 4 347 148 A1

(12)

(43) Date of publication: 10.04.2024 Bulletin 2024/15 (21) Application number: 21729252.3 (22) Date of filing: 24.05.2021

(51) International Patent Classification (IPC):  B21D 28/00(2006.01) B21D 28/32(2006.01) B21D 28/34(2006.01) B21D 28/20(2006.01) B21D 37/02(2006.01) (52) Cooperative Patent Classification (CPC): B21D 28/002; B21D 37/02; B21D 28/20; B21D 28/325 (86) International application number: PCT/EP2021/063735 (87) International publication number: WO 2022/248008 (01.12.2022 Gazette 2022/48)

(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 (71) Applicant: Finn-Power Oy 60100 Seinäjoki (FI)	(72) Inventor: ALA-PRINKKILÄ, Antti 60120 Seinäjoki (FI) (74) Representative: Berggren Oy  P.O. Box 16 Eteläinen Rautatiekatu 10A 00101 Helsinki 00101 Helsinki (FI)