(19)

(11)

EP 0 822 879 A1

(12)

(43) Date of publication: 11.02.1998 Bulletin 1998/07 (21) Application number: 96910874.0 (22) Date of filing: 26.04.1996

(51) International Patent Classification (IPC):  B23D 61/ 02( . ) B27B 5/ 32( . ) (86) International application number: PCT/CA1996/000266 (87) International publication number: WO 1996/033835 (31.10.1996 Gazette 1996/48)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 26.04.1995 CA 19952147899 07.06.1995 US 19950480288 (71) Applicant: Balance Investments Ltd. St. Peter Port, Guernsey GY1 3DQ (GB)	(72) Inventors: TAYLOR, Gary, R. Calgary, Alberta T2X 1B1 (CA) WIERZBA, Paul Calgary, Alberta T3B 4Y5 (CA) (74) Representative: Jehan, Robert, et al  Williams, Powell & Associates, 34 Tavistock Street London WC2E 7PB London WC2E 7PB (GB)