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

1977-02-17

1978-11-21

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

308 27, E21B 908

Patent

active

041261950

ABSTRACT:
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.

REFERENCES:
patent: 1867531 (1932-07-01), Reed
patent: 2187037 (1940-01-01), Kirkpatrick
patent: 3389760 (1968-06-01), Morris
patent: 3612196 (1971-10-01), Dixon
patent: 3750772 (1973-08-01), Venter
patent: 3835944 (1974-09-01), Bingham

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