| 摘要 |
A cutter assembly for a rotary head of a drilling machine comprises a yoke having a base for attachment to the rotary head, a pair of legs depending from the base, and an asymmetrical mounting hole through each leg, the hole being aligned with each other. A load pin extends between the legs of the yoke with the load pin being disposed within the holes. To prevent wear of the yoke during drilling, a replaceable wear pad is provided for each end of the load pin. Each pad is disposed between the load pin and the portion of the periphery of a mounting hole closest to the base. Thus, each wear pad is positioned at the loaded portion of the periphery of a mounting hole. Each wear pad extends around from about 1/3 to about 1/2 the circumference of the load pin. |
