(19)

(11)

EP 3 735 501 A1

(12)

(43) Date of publication: 11.11.2020 Bulletin 2020/46 (21) Application number: 18839679.0 (22) Date of filing: 27.12.2018

(51) International Patent Classification (IPC):  E04F 11/18(2006.01) (86) International application number: PCT/FI2018/050980 (87) International publication number: WO 2019/135025 (11.07.2019 Gazette 2019/28)

(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: 02.01.2018 FI 20185004 (71) Applicant: OY Steelpro Ltd 01750 Vantaa (FI)	(72) Inventor: RAHIKKA Jouko 04350 Nahkela (FI) (74) Representative: Berggren Oy, Helsinki & Oulu  P.O. Box 16 Eteläinen Rautatiekatu 10A 00101 Helsinki 00101 Helsinki (FI)