(19)
(11) EP 0 345 488 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.10.1990 Bulletin 1990/42

(43) Date of publication A2:
13.12.1989 Bulletin 1989/50

(21) Application number: 89108708.2

(22) Date of filing: 16.05.1989
(51) International Patent Classification (IPC)4: B21D 31/04
(84) Designated Contracting States:
ES FR GB

(30) Priority: 10.06.1988 IT 294188

(71) Applicant: Longhi, Giuseppe
I-24100 Bergamo (IT)

(72) Inventor:
  • Longhi, Giuseppe
    I-24100 Bergamo (IT)

(74) Representative: Luksch, Giorgio, Dr.-Ing. et al
Ing. A. Giambrocono & C. S.r.l. Via Rosolino Pilo, 19/b
20129 Milano
20129 Milano (IT)


(56) References cited: : 
   
       


    (54) Improved machine for producing expanded sheet metal


    (57) The improved machine comprises a ram operated in such a manner as to undergo reciprocating movement away from and towards the sheet metal to be expanded The ram carries a toothed blade driven with reciprocating movement in a direction perpendicular to that of the ram and acting on the sheet metal in cooperation with a backing blade able to retract against the action of elastic means. At its ends the ram is connected to rods. These rods are slidingly guided in fixed supports. The rods are connected together in pairs by a cross-member. The rods of pneumatic cylinders operating as pneumatic springs act on the cross-member.







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