(19)
(11) EP 3 277 909 A1

(12)

(43) Date of publication:
07.02.2018 Bulletin 2018/06

(21) Application number: 15713508.8

(22) Date of filing: 02.04.2015
(51) International Patent Classification (IPC): 
E21B 17/03(2006.01)
E21B 19/086(2006.01)
 E21B 17/07(2006.01)
(86) International application number:
PCT/EP2015/057303
(87) International publication number:
WO 2016/155833 (06.10.2016 Gazette 2016/40)
(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

(71) Applicant: Sandvik Intellectual Property AB
811 81 Sandviken (SE)

(72) Inventors:
  • FELBER, Robert
    A-8740 Zeltweg (AT)
  • GALLER, Thomas
    A-8842 Katsch/Mur (AT)
  • HABERER, Christoph
    A-8753 Hetzendorf (AT)

   


(54) EXTENDABLE CYLINDER, DRILL HEAD, AND METHOD