Opposed button thrust surfaces for earth boring bits

Details Opposed button thrust surfaces for earth boring bits Opposed button thrust surfaces for earth boring bits

1984-02-13

1985-10-29

Levy, Stuart S.

Bearings

Rotary bearing

Roller drill bit

F16C 1704

Patent

active

045498202

ABSTRACT:
An earth boring bit has thrust surfaces with enhanced cooling features. The bit has a body with three depending bearing pins. A cutter having an axial cavity is mounted on each bearing pin. The bearing pin and the cavity have mating thrust shoulders. Hard metal inserts or buttons are spaced around each of the shoulders and secured interferingly in mating holes. The buttons in one of the shoulders protrude slightly from the shoulder to allow air to flow past.

REFERENCES:
patent: 2086681 (1937-07-01), Scott

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