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(11)

EP 3 433 463 A1

(12)

(43) Date of publication: 30.01.2019 Bulletin 2019/05 (21) Application number: 17769509.5 (22) Date of filing: 14.02.2017

(51) International Patent Classification (IPC):  E21B 10/61(2006.01) E21B 10/60(2006.01) E21B 7/20(2006.01) E21B 10/64(2006.01) (86) International application number: PCT/FI2017/050083 (87) International publication number: WO 2017/162909 (28.09.2017 Gazette 2017/39)

(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: MA MD (30) Priority: 22.03.2016 FI 20165233 (71) Applicant: Oy Epiroc Drilling Tools AB 33330 Tampere (FI)	(72) Inventor: GYLLING, Kai 33580 Tampere (FI) (74) Representative: Kangasmäki, Reijo Holger  Finnish Patent Consulting FPC Patenttikonsultointi Kangasmäki Oy PL 25 33401 Tampere 33401 Tampere (FI)