(19)

(11)

EP 2 506 993 A1

(12)

(43) Date of publication: 10.10.2012 Bulletin 2012/41 (21) Application number: 10766354.4 (22) Date of filing: 21.09.2010

(51) International Patent Classification (IPC):  B21D 22/16(2006.01) (86) International application number: PCT/PL2010/000094 (87) International publication number: WO 2011/068422 (09.06.2011 Gazette 2011/23)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 01.12.2009 PL 38973109 (71) Applicant: Instytut Obróbki Plastycznej 61-139 Poznan (PL)	(72) Inventors: WISNIEWSKI, Jan PL-61-159 Pozna (PL) DRENGER, Tadeusz PL-60-371 Pozna (PL) (74) Representative: Luczak, Jerzy  Kancelaria Patentowa TAX - PAT Kosciuszki 103/1 61-717 Poznan 61-717 Poznan (PL)