Method of manufacturing an inner cutter for a dry shaver

Details Method of manufacturing an inner cutter for a dry shaver Method of manufacturing an inner cutter for a dry shaver

1992-07-14

1993-06-01

Eley, Timothy V.

Metal working

Method of mechanical manufacture

Providing transitory integral holding or handling portion

295272, 295273, 29558, 761011, 723792, B23D 2500

Patent

active

052148335

ABSTRACT:
An inner cutter for a dry shaver of the present invention includes a plurality of arcuate blades, a plastic frame for supporting the blades, a joint portion for connection with a driving system of the shaver. The arcuate blades are formed from a single piece of a thin metal sheet. The process of forming the blades includes: the step of forming a plurality of arcuate cut edges in the metal sheet such that each span of the cut edges is disposed in parallel with each other, the step of bending the individual arcuate cut edges along the span and normal to the plane of the sheet in order to form the arcuate blades, the step of forming a plurality of recesses in the sheet near the arcuate cut edge for relaxing a shrinkage stress of the plastic frame at the time of the following molding step, the step of molding in the arcuate blades into the plastic frame so as to tightly support the blades, the step of isolating the individual arcuate blades from the metal sheet but supporting the blades only with the plastic frame. Therefore, as the arcuate blades are tightly supported only by the plastic frame, the inner cutter provides excellent shearing performance of hairs without warping the blades when it is reciprocated relative to an outer cutter for shearing hairs. And, there is no problem with respect to cracks of the plastic frame resulted from a shrinkage stress of the plastic.

REFERENCES:
patent: 3858461 (1975-01-01), Tolmie
patent: 4033034 (1977-07-01), Imai et al.

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