(19)
(11) EP 0 401 988 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.02.1991 Bulletin 1991/06

(43) Date of publication A2:
12.12.1990 Bulletin 1990/50

(21) Application number: 90305293.4

(22) Date of filing: 16.05.1990
(51) International Patent Classification (IPC)5: B22D 41/08
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 08.06.1989 DE 8907044 U

(71) Applicant: FOSECO INTERNATIONAL LIMITED
Nechells Birmingham B7 5JR (GB)

(72) Inventors:
  • Comes, Heinrich
    D-4280 Borken, 3-Weseke (DE)
  • Friede, Klaus-Dieter
    D-4223 Vörde 2 (DE)
  • Krampe, Hubert
    D-4421 Reken (DE)
  • Jünnemann, Michael
    D-4504 Georgsmarienhütte (DE)

(74) Representative: Eyles, Winifred Joyce 
Foseco International Limited 285 Long Acre Nechells
Birmingham B7 5JR
Birmingham B7 5JR (GB)


(56) References cited: : 
   
       


    (54) Retaining and/or pouring means for tanks for metal melting baths


    (57) The invention relates to means for retaining contaminations in metal melting baths, e.g. a tundish containing molten metal.
    Contaminations, e.g. from slag and other covering layers on the metal surface, can pass through the outlet of the tundish and hence contaminate the cast metal. The invention aims to avoid this problem by providing an annular buoyancy body (2) which surrounds the outlet (4), the body (2) being in the form of a protective ring preventing particles (10, 11) floating on the surface of the metal (12) from entering outlet (4). The body (2) may be constrained to surround a starting tube (1) which surrounds outlet (4) and to float up the starting tube (1) with increasing depth of molten metal (12). Pouring openings (3) in the starting tube (1) are thereby effectively closed by body (2) as the slag-covered surface of the metal (12) rises above the openings (3) and the openings (3) are then exposed to allow molten metal (12) to flow through only after layers (10, 11) of potential contaminations have safely passed.







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