(19)

(11)

EP 4 384 692 A1

(12)

(43) Date of publication: 19.06.2024 Bulletin 2024/25 (21) Application number: 21763045.8 (22) Date of filing: 12.08.2021

(51) International Patent Classification (IPC):  E21C 35/18(2006.01) (52) Cooperative Patent Classification (CPC): E21C 35/188 (86) International application number: PCT/EP2021/072478 (87) International publication number: WO 2023/016648 (16.02.2023 Gazette 2023/07)

(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: Construction Tools GmbH 45143 Essen (DE)	(72) Inventors: DÄHNE, Roger 36322 Bad Salzungen (DE) GOEBEL, Christoph 74582 Gerabronn (DE) (74) Representative: Epiroc Rock Drills AB  Patents 701 91 Örebro 701 91 Örebro (SE)