(19)

(11)

EP 2 315 915 A1

(12)

(43) Date of publication: 04.05.2011 Bulletin 2011/18 (21) Application number: 09793729.6 (22) Date of filing: 30.01.2009

(51) International Patent Classification (IPC):  E21D 9/11(2006.01) E21D 11/18(2006.01) E21D 11/40(2006.01) (86) International application number: PCT/CA2009/000107 (87) International publication number: WO 2010/003213 (14.01.2010 Gazette 2010/02)

(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 MK MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA RS (30) Priority: 07.07.2008 US 129594 P (71) Applicant: McNally, Michael P. Freelton, Ontario L0R 1K0 (CA)	(72) Inventor: McNally, Michael P. Freelton, Ontario L0R 1K0 (CA) (74) Representative: Beattie, Alex Thomas Stewart  Forrester & Boehmert Pettenkoferstrasse 20-22 80336 München 80336 München (DE)