(19)
(11) EP 2 078 133 A1

(12)

(43) Date of publication:
15.07.2009 Bulletin 2009/29

(21) Application number: 07835294.5

(22) Date of filing: 04.10.2007
(51) International Patent Classification (IPC): 
E21B 19/18(2006.01)
 E21B 19/20(2006.01)
(86) International application number:
PCT/SE2007/050709
(87) International publication number:
WO 2008/054302 (08.05.2008 Gazette 2008/19)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

(30) Priority: 30.10.2006 SE 0602275

(71) Applicant: Atlas Copco Rock Drills AB
701 91 Örebro (SE)

(72) Inventors:
  • ANDRÉN, Mats
    653 49 Karlstad (SE)
  • JONSSON, Hans
    654 64 Karlstad (SE)

   


(54) BIT CHANGER