(19)

(11)

EP 0 187 841 A1

(12)

(43) Date of publication: 23.07.1986 Bulletin 1986/30 (21) Application number: 85903682.0 (22) Date of filing: 26.07.1985

(51) International Patent Classification (IPC):  B21B 13/ 20( . ) (86) International application number: PCT/GB1985/000335 (87) International publication number: WO 1986/000835 (13.02.1986 Gazette 1986/04)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 27.07.1984 GB 19840019187 (71) Applicant: HILLE ENGINEERING COMPANY LIMITED Sheffield S3 8DL (GB)	(72) Inventor: WILSON, Alexander Ian Sheffield S11 9NH Yorkshire (GB)