C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
C25C 3/14 (2006.01)
Patent
CA 2570550
The invention concerns a scraper (40) for a drilling member (33) such as a taper, for forming an opening in a crust of alumina and of a solidified igneous electrolytic solution by a reciprocating movement along an axis of translation T. The inventive scraper (40) is characterized in that it comprises a plurality of fingers (42) arranged about an axis of reference S designed to merge with said axis of translation T in use, so as to clear a space (44) between the fingers and the drilling member, and in that each finger (42) includes at least a scraping member (43) projecting towards the drilling member (33). The inventive scraper eliminates formation of an envelope at the surface of the drilling member which can block the member in the scraper.
L'invention concerne un racleur (40) d'un organe de perçage (33), tel qu'un piqueur, utilisable pour former une ouverture dans une croûte d'alumine et de bain solidifié d'une cellule d'électrolyse ignée par un mouvement de va-et- vient dudit organe le long d'un axe de translation T. Le racleur selon l'invention est caractérisé en ce qu'il comporte une pluralité de doigts (42) disposés autour d'un axe de référence S destiné à être confondu avec ledit axe de translation T en utilisation, de façon à libérer un espace (44) entre les doigts et l'organe de perçage, et en ce que chaque doigt comprend au moins un organe de raclage (43) formant saillie en direction de l'organe de perçage . Le racleur selon l'invention permet d'éviter la formation d'une une enveloppe à la surface de l'organe de perçage qui peut bloquer l'organe dans le racleur.
E.c.l.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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