(19)

(11)

EP 0 313 610 A1

(12)

(43) Date of publication: 03.05.1989 Bulletin 1989/18 (21) Application number: 88903886.0 (22) Date of filing: 29.04.1988

(51) International Patent Classification (IPC):  B21B 31/ 18( . ) B21B 35/ 14( . ) B21B 35/ 00( . ) (86) International application number: PCT/GB1988/000336 (87) International publication number: WO 1988/008761 (17.11.1988 Gazette 1988/25)

(84) Designated Contracting States: BE DE GB IT NL SE (30) Priority: 05.05.1987 GB 19870010548 25.01.1988 GB 19880001595 (71) Applicant: DAVY McKEE (SHEFFIELD) LIMITED Sheffield S9 4EX (GB)	(72) Inventors: LISTER, Michael Sheffield Yorkshire S13 8LF (GB) MARSHALL, Robert Sheffield Yorkshire S31 7GJ (GB) TAYLOR, Leonard, Guy Sheffield S5 9NZ (GB) (74) Representative: Kirk, Geoffrey Thomas, et al  BATCHELLOR, KIRK & CO. 2 Pear Tree Court Farringdon Road London EC1R 0DS London EC1R 0DS (GB)