| 摘要 |
<p>1,161,924. Nail filer. R. STEDING. 29 March, 1967 [6 April, 1966; 7 July, 1966], No. 14200/67. Heading A5R. '[Also in Divisions B3 and C7] A metal foil 1 securable to a backing member 2 to form a file has tooth ridges, la separated by smooth concave recesses 1c the tooth .ridges terminating .in a common, working plane and having faces which lie at approximately 90‹ to this plane. The tooth ridges may have smooth crown surfaces 1b preferably at least 10 microns in width but alternatively the faces of the tooth ridges may meet substanially in a point Id, Fig. 9. The teeth may be straight and parallel or curved and may lie in intersecting directions. (Fig. 8 not shown). The foil may be cemented back to back with a similar foil or to a disc or cylindnical member to form a nail file or a tool for filing plastics or metal which is stated to have a polishing effect in use. To produce the foil a negative former is first prepared by printing, photographically or otherwise, a pattern of non-conductive regions 3a on a metal plate 3. Metal is then deposited electrolytically or by means of a salt bath on the conductive regions to form a series of projections 3b which are allowed to grow till the desired spacing for the tooth ridges exists between the projections. The entire former is then coated with a conductive separating layer and metal preferably nickel, deposited electrolytically or by a salt bath to form the foil which can subsequently be removed from the former. The deposition of the metal of the foil may be initially by a salt bath method to produce a hard surface layer and subsequently by an electrolytic method to provide a backing layer of the same or different metal.</p> |
