Shaving head for dry shavers having a coated outer surface

摘要

1,134,883. Dry shavers. GILLETTE CO. 24 Nov., 1965 [24 Nov., 1964], No. 49996/65. Heading B4B. [Also in Division C7] A shearing foil for a dry shaver comprises a perforated base sheet 31 electrolytically coated with harder material 41 which provides sharp cutting edges 51 but leaves uncoated that side of the base sheet which will face a blade of the shaver. Fig. 1 (not shown) illustrates making a foil base sheet (3) by electrolytically depositing resilient material, e.g. Ni, on to a metal die (1) having an insulating layer (2) with a configuration corresponding with that of the holes to be produced in the foil. A layer of harder material (4), e.g. of Cr, Rh or hard Ni, is electrolytically deposited on the base sheet (3) while still on the die. Prior to this deposition of harder material, portions of the base sheet may be masked with varnish. The base sheet (3) and harder material (4) may both be electrolytically deposited from a bath of the same composition but using different current densities. During use the shaver cutter causes the foil to wear, the less hard material wearing more than the harder material as illustrated in Fig. 3 (not shown).