(19)
(11) EP 0 336 783 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.11.1990 Bulletin 1990/47

(43) Date of publication A2:
11.10.1989 Bulletin 1989/41

(21) Application number: 89303585.7

(22) Date of filing: 10.04.1989
(51) International Patent Classification (IPC)4: B21C 37/20, B21K 1/56
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 08.04.1988 GB 8808289
12.04.1988 GB 8808565

(71) Applicant: Willetts, Charles Anthony
West Midlands, DY8 4QU (GB)

(72) Inventor:
  • Willetts, Charles Anthony
    West Midlands, DY8 4QU (GB)

(74) Representative: Leach, John Nigel et al
FORRESTER & BOEHMERT Franz-Joseph-Strasse 38
80801 München
80801 München (DE)


(56) References cited: : 
   
       


    (54) Producing a thread on a tube


    (57) "A method of and apparatus for producing a formation such as a screw thread (27) on a tube (2) comprising the steps of forcing a surface of the tube such as by a mandrel (18) against a pattern member (4, 5) having a pattern thereon so as to displace the material of the tube (2) into the pattern to form the formation on the surface of the tube."







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