Earth boring bit with renewable bearing surface

Details Earth boring bit with renewable bearing surface Earth boring bit with renewable bearing surface

1979-03-05

1980-11-25

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

308 82, 175372, E21B 1022

Patent

active

042352959

ABSTRACT:
A rolling cone cutter earth boring bit is provided with a load carrying bearing surface that can be renewed during the earth boring operation. A canister bearing element is positioned between the bearing pin and the rolling cone cutter. The rolling cone cutter rotates about the canister bearing element in a first direction during normal drilling operations. The canister bearing element has directional stops on its inside surface. These directional stops engage directional stops on the bearing pin and prevent rotation of the canister bearing element during normal drilling operations. The bearing surface can be renewed by reversing the direction of cutter rotation thereby disengaging the canister bearing element from the directional stops and allowing it to rotate in the opposite direction until a new bearing surface is in the load area. The new surface is locked in place by the directional stops or independent means and the rolling cone cutter again is rotated in the first direction for normal drilling operation.

REFERENCES:
patent: 3612197 (1971-10-01), Motoyama
patent: 3720274 (1973-03-01), McCallum
patent: 3721307 (1973-03-01), Mayo
patent: 3966274 (1976-06-01), Penny

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