(19)

(11)

EP 4 200 508 A1

(12)

(43) Date of publication: 28.06.2023 Bulletin 2023/26 (21) Application number: 21759429.0 (22) Date of filing: 17.08.2021

(51) International Patent Classification (IPC):  E21B 12/06(2006.01) (52) Cooperative Patent Classification (CPC): E21B 12/06 (86) International application number: PCT/SE2021/050801 (87) International publication number: WO 2022/039653 (24.02.2022 Gazette 2022/08)

(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: 18.08.2020 SE 2050959 (71) Applicant: Epiroc Rock Drills Aktiebolag 701 91 Örebro (SE)	(72) Inventors: ENGBLOM, Johan 713 91 Nora (SE) EKEFALK, Martin 692 92 Kumla (SE) (74) Representative: Epiroc Rock Drills AB  Patents 701 91 Örebro 701 91 Örebro (SE)