Patent ID: 7013566

Claim:
A rotary hair trimmer, comprising: a first cutting head including 4 first cutting teeth circularly arrayed thereon, each of said first cutting teeth including a first leading cutting edge disposed thereon at a first leading axial rake angle relative to a rotational axis of the first head and a first trailing cutting edge disposed thereon at a first trailing axial rake angle relative to the rotational axis of the first head; and a second cutting head rotatably arranged relative to said first cutting head and including a number selected from the group consisting of 5, 7, 9, and 11 of second cutting teeth circularly arrayed thereon, each of said second cutting teeth including a second leading cutting edge disposed at a second leading axial rake angle relative to a rotational axis of the second head and a second trailing cutting edge disposed at a second trailing axial rake angle relative to the rotational axis of the second head; wherein said first leading axial rake angle is different from said second trailing axial rake angle; wherein said second leading axial rake angle is different from said first trailing axial rake angle.