(19)

(11)

EP 2 764 259 A1

(12)

(43) Date of publication: 13.08.2014 Bulletin 2014/33 (21) Application number: 11873772.5 (22) Date of filing: 07.10.2011

(51) International Patent Classification (IPC):  F16B 41/00(2006.01) B60B 3/14(2006.01) (86) International application number: PCT/CA2011/050635 (87) International publication number: WO 2013/049913 (11.04.2013 Gazette 2013/15)

(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 (71) Applicants: Boyce, Bruce R. Calgary, Alberta T3K 4P8 (CA) Hutchings, Warren W. Calgary, Alberta T2Z 3C5 (CA)	(72) Inventors: Boyce, Bruce R. Calgary, Alberta T3K 4P8 (CA) Hutchings, Warren W. Calgary, Alberta T2Z 3C5 (CA) (74) Representative: Gulde & Partner  Patent- und Rechtsanwaltskanzlei mbB Wallstraße 58/59 10179 Berlin 10179 Berlin (DE)