(19)

(11)

EP 4 278 067 A1

(12)

(43) Date of publication: 22.11.2023 Bulletin 2023/47 (21) Application number: 22702327.2 (22) Date of filing: 11.01.2022

(51) International Patent Classification (IPC):  E21D 20/00(2006.01) (52) Cooperative Patent Classification (CPC): E21D 20/00 (86) International application number: PCT/SE2022/050011 (87) International publication number: WO 2022/154717 (21.07.2022 Gazette 2022/29)

(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: 13.01.2021 SE 2150018 (71) Applicant: Epiroc Rock Drills Aktiebolag 701 91 Örebro (SE)	(72) Inventor: ENGBLOM, Johan 713 91 Nora (SE) (74) Representative: Epiroc Rock Drills AB  Patents 701 91 Örebro 701 91 Örebro (SE)