(19)

(11)

EP 0 231 321 A1

(12)

(43) Date of publication: 12.08.1987 Bulletin 1987/33 (21) Application number: 86904871.0 (22) Date of filing: 05.08.1986

(51) International Patent Classification (IPC):  B21D 7/ 02( . ) B21D 7/ 12( . ) B21D 7/ 024( . ) (86) International application number: PCT/GB1986/000472 (87) International publication number: WO 1987/000775 (12.02.1987 Gazette 1987/04)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 05.08.1985 GB 19850019626 11.07.1986 GB 19860016902 (71) Applicant: GARDNER, Robert Frederick Creaton, Northampton (GB)	(72) Inventor: GARDNER, Robert Frederick Creaton, Northampton (GB)