Patent ID: 7856720

Claim:
A replaceable cutting unit for hair dressing comprising: a cutting unit base that has a length, a width and a thickness, and is designed to fit in recess of a tool for hair dressing, the length and width forming a first surface on a top of the cutting unit base and a second surface on a bottom of the cutting unit base, at least three cutters that are set upright on and perpendicular to the surface of the cutting unit base with a cutting edge of each of the cutters being perpendicular to the first surface, each of the cutters extending in a respective plane parallel to but not co-planar with a plane of another of the cutters, wherein: each of the cutters is supported in a cover with an equal spacing between adjacent covers, the covers extend from the first surface in the upright direction, and each of the covers extends beyond an end of the cutters that is located opposite from the cutting unit base, the cutters are installed inside the covers so as to have the cutting edge exposed at an opening in a side of each of the covers, the at least three cutters are disposed in a line extending along the length of the cutting unit base and an inclination angle of the plane of each of the cutters with respect to the line is within a range of 10 to 80 degrees, the length and thickness form a third surface on a third side of the cutting unit base, the third side including irregularities to mate with irregularities in the recess, the width and thickness forming a fourth surface on an end of the cutting unit base, the end including a stopper to aid in retaining the cutting unit base in the recess, and a handle is included on the second surface to aid in extracting the cutting unit base from the tool for hair dressing.