| 摘要 |
A rasp blade 200 has cutting teeth 130, 132, 134, 136, 140 arranged along the outer perimeter of the blade and having a variable radius. The radius is raised for the teeth 130, 132, 134, 136 at either end of the blade. The radius is lower for the teeth 140 at the center of the blade 200. The radius variation is determined by the rasp blade cutting diameter and the angle that the blade 200 is to nest on the end plate of the hub assembly in which the blade is used. The blade may extend from 30° to 90° with the preferred sizes being 45° or 90°. At least three apertures 148 are provided in each blade to ensure that the failure of any one pin holding the blade in the hub assembly does not result in catastrophic damage to the hub assembly. |
