(19)

(11)

EP 4 540 497 A1

(12)

(43) Date of publication: 23.04.2025 Bulletin 2025/17 (21) Application number: 22736034.4 (22) Date of filing: 20.06.2022

(51) International Patent Classification (IPC):  E21D 20/00(2006.01) E21B 19/24(2006.01) E21B 44/06(2006.01) (52) Cooperative Patent Classification (CPC): E21D 20/003; E21B 44/06; E21B 19/24 (86) International application number: PCT/SE2022/050602 (87) International publication number: WO 2023/249518 (28.12.2023 Gazette 2023/52)

(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) Inventors: GUSTAVSSON, Hans 701 91 Örebro (SE) DEUTSCH, René 701 91 Örebro (SE) (74) Representative: Epiroc Rock Drills AB  Patents 701 91 Örebro 701 91 Örebro (SE)