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(11)

EP 0 397 750 A1

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(43) Date of publication: 22.11.1990 Bulletin 1990/47 (21) Application number: 89901955.0 (22) Date of filing: 09.01.1989

(51) International Patent Classification (IPC):  B21D 51/ 38( . ) (86) International application number: PCT/US1989/000071 (87) International publication number: WO 1989/006575 (27.07.1989 Gazette 1989/16)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 13.01.1988 US 19880143585 (60) Divisional application: 92119489.0 / 0543297 (60) Divisional application: 92119490.8 / 0542310 (71) Applicant: SERVICE TOOL DIE & MFG. COMPANY Elk Grove Village, IL 6007 (US)	(72) Inventors: HERDZINA, Frank, J. Schaumburg, IL 60172 (US) GOODRICH, Rollie, M. Palatine, IL 60067 (US) (74) Representative: Schuster, Thomas, Dipl.-Phys.  Grünecker, Kinkeldey, Stockmair & Partner Patentanwälte Maximilianstrasse 58 D-80538 München D-80538 München (DE)