(19)

(11)

EP 2 780 509 A1

(12)

(43) Date of publication: 24.09.2014 Bulletin 2014/39 (21) Application number: 12839802.1 (22) Date of filing: 11.10.2012

(51) International Patent Classification (IPC):  E01F 9/012(2006.01) (86) International application number: PCT/CA2012/050717 (87) International publication number: WO 2013/053061 (18.04.2013 Gazette 2013/16)

(84) Designated Contracting States: AL 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 RS SE SI SK SM TR (30) Priority: 11.10.2011 US 201161627303 P (71) Applicant: Archer, Geoffrey Russell Victoria, British Columbia V8R 5E8 (CA)	(72) Inventor: Archer, Geoffrey Russell Victoria, British Columbia V8R 5E8 (CA) (74) Representative: Misselbrook, Paul  Appleyard Lees 15 Clare Road Halifax HX1 2HY Halifax HX1 2HY (GB)