(19)

(11)

EP 2 195 510 A1

(12)

(43) Date of publication: 16.06.2010 Bulletin 2010/24 (21) Application number: 08800058.3 (22) Date of filing: 25.09.2008

(51) International Patent Classification (IPC):  E21D 20/02(2006.01) (86) International application number: PCT/AU2008/001423 (87) International publication number: WO 2009/039573 (02.04.2009 Gazette 2009/14)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 25.09.2007 AU 2007905215 (71) Applicant: HILTI Aktiengesellschaft 9494 Schaan (LI)	(72) Inventor: MCCOWAN, Brian Cardiff, New South Wales 2285 (AU)