Electric razor inner blade unit

Details Electric razor inner blade unit Electric razor inner blade unit

2005-10-04

2005-10-04

Watts, Douglas D (Department: 3724)

Cutlery

Blades

Razor blade

C030S043920

Reexamination Certificate

active

06951056

ABSTRACT:
An inner cutter for a dry shaver has a plurality of blades30supported on a base20and is driven in hair-shearing engagement with an outer cutter10for cutting the hairs. The blades30are arranged in parallel with each other and are each provided on opposite sides at its top with cutting edges32. The cutting edge32is defined between the top face of the blade and a rake fade33on the underside of the blade. The rake face33is inclined with respect to the top face at an angle of α (°), while the cutting edge is rounded at its tip to have a curvature radius R (μm) which satisfies a relation that R≧−0.067·α+4.7. With this result, the cutting resistance for cutting the hair can be lowered below a load necessary for bending the hair. Thus, the blade of the inner cutter can itself cut the hair without bending the hair, giving a flat cutting plane finish and enabling a close shave only with a fewer shaving strokes.

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