(19)

(11)

EP 1 687 496 A1

(12)

(43) Date of publication: 09.08.2006 Bulletin 2006/32 (21) Application number: 04789796.2 (22) Date of filing: 28.10.2004

(51) International Patent Classification (IPC):  E04C 3/08(2006.01) B21D 53/00(2006.01) E04B 5/10(2006.01) (86) International application number: PCT/CA2004/001889 (87) International publication number: WO 2005/042869 (12.05.2005 Gazette 2005/19)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 28.10.2003 US 514622 P 25.11.2003 US 721610 (71) Applicant: Best Joist Inc. Richmond Hill, Ontario L4C 1W4 (CA)	(72) Inventors: STRICKLAND, Michael, Richard Richmond Hill, Ontario L4C 1W4 (CA) XU, Lei Waterloo, Ontario N2K 4C8 (CA) (74) Representative: Weydert, Robert et al Dennemeyer & Associates Sàrl P.O. Box 1502 1015 Luxembourg 1015 Luxembourg (LU)