(19)
(11) EP 4 077 869 A1

(12)

(43) Date of publication:
26.10.2022 Bulletin 2022/43

(21) Application number: 20816653.8

(22) Date of filing: 25.11.2020
(51) International Patent Classification (IPC): 
E21B 19/16(2006.01)
E21B 19/20(2006.01)
 E21B 19/18(2006.01)
E21B 15/04(2006.01)
(52) Cooperative Patent Classification (CPC):
E21B 19/165; E21B 19/20; E21B 19/18; E21B 15/04
(86) International application number:
PCT/SE2020/051120
(87) International publication number:
WO 2021/126038 (24.06.2021 Gazette 2021/25)
(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: 20.12.2019 SE 1951523

(71) Applicant: Epiroc Rock Drills Aktiebolag
701 91 Örebro (SE)

(72) Inventor:
  • HELLMAN, Anders
    702 30 Örebro (SE)

(74) Representative: Epiroc Rock Drills AB 
Patents
701 91 Örebro
701 91 Örebro (SE)

   


(54) A METHOD PERFORMED BY A CONTROL DEVICE FOR CHANGING A DRILL BIT IN A ROCK DRILLING UNIT, A CONTROL DEVICE OF A ROCKDRILLING UNIT, A ROCK DRILLING UNIT AND A ROCK DRILLING RIG