(19)

(11)

EP 1 733 120 A1

(12)

(43) Date of publication: 20.12.2006 Bulletin 2006/51 (21) Application number: 05728094.3 (22) Date of filing: 23.03.2005

(51) International Patent Classification (IPC):  E21C 35/18(2006.01) (86) International application number: PCT/SE2005/000431 (87) International publication number: WO 2005/093214 (06.10.2005 Gazette 2005/40)

(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 MC NL PL PT RO SE SI SK TR (30) Priority: 26.03.2004 AU 2004201284 14.05.2004 US 845556 (71) Applicant: Sandvik Intellectual Property AB 811 81 Sandviken (SE)	(72) Inventors: SLEEP, Keith Glenella, QLD 4740 (AU) WEAVER, Steven Maryland, NSW 2287 (AU)