(19)

(11)

EP 4 158 274 A1

(12)

(43) Date of publication: 05.04.2023 Bulletin 2023/14 (21) Application number: 21729058.4 (22) Date of filing: 24.05.2021

(51) International Patent Classification (IPC):  F42D 1/10(2006.01) F42D 1/22(2006.01) (52) Cooperative Patent Classification (CPC): F42D 1/22; F42D 1/10 (86) International application number: PCT/SE2021/050483 (87) International publication number: WO 2021/242163 (02.12.2021 Gazette 2021/48)

(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: 26.05.2020 SE 2030174 (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)