(19)

(11)

EP 3 102 744 A1

(12)

(43) Date of publication: 14.12.2016 Bulletin 2016/50 (21) Application number: 15740514.3 (22) Date of filing: 23.01.2015

(51) International Patent Classification (IPC):  E02F 9/20(2006.01) E21C 27/30(2006.01) (86) International application number: PCT/CA2015/000044 (87) International publication number: WO 2015/109392 (30.07.2015 Gazette 2015/30)

(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 (30) Priority: 24.01.2014 US 201461931243 P 06.08.2014 US 201462033904 P (71) Applicant: Atlas Copco Rock Drills AB 701 91 Örebro (SE)	(72) Inventors: DOBSON, Andrew Kitchener, Ontario N2N 0A5 (CA) MARSHALL, Joshua Kingston, Ontario K7L 4P8 (CA)