(19)
(11) EP 1 399 640 A1

(12)

(43) Date of publication:
24.03.2004 Bulletin 2004/13

(21) Application number: 02741584.3

(22) Date of filing: 20.06.2002
(51) International Patent Classification (IPC)7: E21B 10/40, E21B 10/64, E21B 7/20
(86) International application number:
PCT/SE2002/001212
(87) International publication number:
WO 2003/001022 (03.01.2003 Gazette 2003/01)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

(30) Priority: 26.06.2001 SE 0102292

(71) Applicant: Sandvik AB (publ)
811 81 Sandviken (SE)

(72) Inventors:
  • HADIN, Per-Ola
    S-811 95 Järbo (SE)
  • LARSSON, Kenneth
    S-811 21 Sandviken (SE)

   


(54) ROCK DRILLING TOOL, A RING DRILL BIT AND AN ADAPTER FOR PERCUSSIVE DRILLING