(19)
(11) EP 0 353 008 A3

(12) EUROPEAN PATENT APPLICATION

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

(43) Date of publication A2:
31.01.1990 Bulletin 1990/05

(21) Application number: 89307512.7

(22) Date of filing: 24.07.1989
(51) International Patent Classification (IPC)5: B21D 28/00
(84) Designated Contracting States:
DE ES FR GB IT

(30) Priority: 25.07.1988 US 223908

(71) Applicant: CONNELL LIMITED PARTNERSHIP
Boston Massachusetts 02110 (US)

(72) Inventor:
  • Gerhart, Roland T.
    Milford Michigan 48042 (US)

(74) Representative: Valentine, Francis Anthony Brinsley et al
REDDIE & GROSE 16 Theobalds Road
London WC1X 8PL
London WC1X 8PL (GB)


(56) References cited: : 
   
       


    (54) Fluid-pressure operated punch


    (57) A fluid-pressure operated punching apparatus (10) includes an elongated substantially cylindrical punch support assembly (31) slidably disposed for reciprocatory, lengthwise sliding movement in a cylindrical opening (13) in a body (11). The punch support assembly (31) has a piston head (36) at the rearward end thereof and a piston rod (35) extending lengthwise forwardly from the piston head (34). A punch retainer (33) is mounted on the forward end of the piston rod (35) and carries a punch (78). Annular sealing means (50) are provided on the piston head for sealingly engaging the internal surface defining the cylindrical opening (13) of the elongated body. A fluid pressure supply port (94) is formed in the body (11) for supplying pressure fluid to move the punch support (31) assembly toward the forward end of the body (11).







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