(19)

(11)

EP 3 949 107 A1

(12)

(43) Date of publication: 09.02.2022 Bulletin 2022/06 (21) Application number: 20718850.9 (22) Date of filing: 02.04.2020

(51) International Patent Classification (IPC):  H02P 6/04(2016.01) E21C 35/00(2006.01) H02P 6/08(2016.01) F15B 11/00(2006.01) (52) Cooperative Patent Classification (CPC): F15B 2211/71; F15B 2211/20576; F15B 2211/6651; F15B 2211/6343; F15B 2211/20546; F15B 2211/6346; F15B 2211/6654; F15B 2211/20515; H02P 6/08; H02P 6/04; F15B 2211/6333; F15B 2211/20538; F15B 11/0423; F15B 21/0423 (86) International application number: PCT/SE2020/050348 (87) International publication number: WO 2020/204803 (08.10.2020 Gazette 2020/41)

(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: 05.04.2019 SE 1950428 (71) Applicant: Epiroc Rock Drills Aktiebolag 701 91 Örebro (SE)	(72) Inventors: LEJONBERG, Robert 725 97 Värsterås (SE) BAGGE, Markus 703 43 Örebro (SE) (74) Representative: Epiroc Rock Drills AB  Patents 701 91 Örebro 701 91 Örebro (SE)