(19)

(11)

EP 4 267 830 A2

(12)

(88) Date of publication A3: 04.08.2022 (43) Date of publication: 01.11.2023 Bulletin 2023/44 (21) Application number: 21834973.6 (22) Date of filing: 17.12.2021

(51) International Patent Classification (IPC):  E21B 19/14(2006.01) E21B 19/20(2006.01) E21B 19/18(2006.01) E21B 7/02(2006.01) (52) Cooperative Patent Classification (CPC): E21B 19/20; E21B 7/025 (86) International application number: PCT/SE2021/051282 (87) International publication number: WO 2022/139663 (30.06.2022 Gazette 2022/26)

(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: 23.12.2020 SE 2051561 (71) Applicant: Epiroc Rock Drills Aktiebolag 701 91 Örebro (SE)	(72) Inventor: STÅLNACKE, Gunnar 195 93 Märsta (SE) (74) Representative: Epiroc Rock Drills AB  Patents 701 91 Örebro 701 91 Örebro (SE)