Patent ID: 8832946

Claim:
A blade comprising: a support; a first set of teeth attached to the support, each defining a flat tip, each flat tip comprising a top surface having a perimeter formed by a first side and a second side that are parallel to each other, a third side and a fourth side that are parallel to each other and perpendicular to the first side and the second side, and a fifth side and a sixth side that are not parallel to each other and not parallel to any of the first, second, third and fourth sides, each of the first set of teeth comprising: a first lateral surface comprising a horizontal edge which is the fifth side of the top surface, the first lateral surface extends down from the fifth side of the top surface and shares a vertical edge with an adjacent tooth, the first lateral surface meets the support at one end of the vertical edge shared by the first lateral surface and the adjacent tooth, and the opposite end of the vertical edge shared by the first lateral surface and the adjacent tooth is adjacent to the top surface, and a second lateral surface comprising a horizontal edge which is the sixth side of the top surface, the second lateral surface extends down from the sixth side of the top surface and shares a vertical edge with another adjacent tooth, wherein the second lateral surface meets the support at one end of the vertical edge shared by the second lateral surface and the another adjacent tooth, and the opposite end of the vertical edge shared by the second lateral surface and the another adjacent tooth is adjacent to the top surface; and second and third sets of teeth attached to the support, each defining a sharp tip, and the first set of teeth is positioned on the support between the second and third sets of teeth.