Patent ID: 8136250

Claim:
A haircutting device with a cutting unit, the cutting unit comprising: a plurality of blades configured to be moved relative to each other; and a plurality of teeth, each of the plurality of teeth having a free end and a junction end joined to a corresponding end of one of the plurality of blades, wherein at least some teeth have a larger cross-sectional area at the free end than at the junction end joined to the corresponding end of one of the plurality of blades, wherein the larger cross-sectional area is at least 0.32 mm 2 , wherein a distance from a surface of the free end facing a skin with hair to be cut to a middle axis of the tooth is greater than a distance from a surface of the blade facing the skin to the middle axis of the tooth, and wherein, for the teeth with the larger cross-sectional area, a distance from a surface of the free end opposite the surface facing the skin to the middle axis of the tooth is greater than a distance from a surface of the blade opposite the surface facing the skin to the middle axis of the tooth.