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(11)

EP 0 612 396 A1

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(43) Date of publication: 31.08.1994 Bulletin 1994/35 (21) Application number: 92923263.0 (22) Date of filing: 13.11.1992

(51) International Patent Classification (IPC):  B23K 1/ 00( . ) F28D 9/ 00( . ) F28F 3/ 08( . ) F28F 13/ 12( . ) F28D 1/ 03( . ) F28F 3/ 06( . ) F28F 9/ 02( . ) (86) International application number: PCT/CA1992/000496 (87) International publication number: WO 1993/010415 (27.05.1993 Gazette 1993/13)

(84) Designated Contracting States: DE FR GB IT SE (30) Priority: 15.11.1991 US 19910792435 (71) Applicant: LONG MANUFACTURING LTD. Oakville Ontario L6K 3E4 (CA)	(72) Inventors: SO, Allan, K. Mississauga, Ontario L5B 2Z1 (CA) AVERY, Nicholas, F. Oakville, Ontario L6L 4B8 (CA) ROWNTREE, David, G. Brampton, Ontario L6X 2G3 (CA) (74) Representative: Gralfs, Harro, Dipl.-Ing. Patentanwalt  Jasperallee 1 A D-38102 Braunschweig D-38102 Braunschweig (DE)