(19)

(11)

EP 0 472 606 A1

(12)

(43) Date of publication: 04.03.1992 Bulletin 1992/10 (21) Application number: 90908165.0 (22) Date of filing: 18.05.1990

(51) International Patent Classification (IPC):  B21B 31/ 07( . ) F16C 35/ 063( . ) F16C 13/ 02( . ) (86) International application number: PCT/AU1990/000205 (87) International publication number: WO 1990/014524 (29.11.1990 Gazette 1990/27)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 18.05.1989 AU 19890004243 (71) Applicant: THE BROKEN HILL PROPRIETARY COMPANY LIMITED Melbourne, Victoria 3000 (AU)	(72) Inventors: BUSHELL, Ronald Henry Alexander Baldivis, W.A. 6171 (AU) KLESSENS, Wilhelmus Johanus Maria Hilton, W.A. 6163 (AU) (74) Representative: Leiser, Gottfried, Dipl.-Ing., et al  Prinz & Partner, Manzingerweg 7 D-81241 München D-81241 München (DE)