(19)

(11)

EP 4 405 558 A1

(12)

(43) Date of publication: 31.07.2024 Bulletin 2024/31 (21) Application number: 21787085.6 (22) Date of filing: 24.09.2021

(51) International Patent Classification (IPC):  E21B 7/02(2006.01) E21B 19/086(2006.01) (52) Cooperative Patent Classification (CPC): E21B 7/025; E21B 19/086 (86) International application number: PCT/SE2021/050933 (87) International publication number: WO 2023/048606 (30.03.2023 Gazette 2023/13)

(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: Epiroc Rock Drills Aktiebolag 701 91 Örebro (SE)	(72) Inventor: SJÖHOLM, Oskar 702 18 Örebro (SE) (74) Representative: Epiroc Rock Drills AB  Patents 701 91 Örebro 701 91 Örebro (SE)