(19)

(11)

EP 4 172 455 A1

(12)

(43) Date of publication: 03.05.2023 Bulletin 2023/18 (21) Application number: 21737073.3 (22) Date of filing: 29.06.2021

(51) International Patent Classification (IPC):  E21B 17/02(2006.01) E21B 17/042(2006.01) (52) Cooperative Patent Classification (CPC): E21B 17/0426; E21B 17/02; E21B 17/042 (86) International application number: PCT/EP2021/067808 (87) International publication number: WO 2022/002911 (06.01.2022 Gazette 2022/01)

(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: 30.06.2020 EP 20183128 (71) Applicant: Sandvik Mining and Construction Tools AB 81181 Sandviken (SE)	(72) Inventor: HAMMARGREN, John 81630 Sandviken (SE) (74) Representative: Sandvik  Sandvik Intellectual Property AB 811 81 Sandviken 811 81 Sandviken (SE)