Replaceable wear pad for a rock bit cutter yoke

Details Replaceable wear pad for a rock bit cutter yoke Replaceable wear pad for a rock bit cutter yoke

E - Fixed Constructions

21

B

255/77

E21B 10/00 (2006.01) E21B 10/10 (2006.01) E21B 10/50 (2006.01)

Patent

CA 1073444

ABSTRACT OF THE DISCLOSURE 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 a mounting hole through each leg, the holes 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.

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