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

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Opposed button thrust surfaces for earth boring bits

Details

Inventors: Mullins, John M.;
Assignee: Hughes Tool Company - USA (Houston, TX)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

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.

DETAILED DESCRIPTION In this invention, each of the thrust shoulders contains a plurality of wear resistant buttons.
These buttons engage each other in sliding contact to absorb outward thrust.
The buttons are secured in holes with an interference fit.
The buttons in at least one of the shoulders protrude a short distance from the shoulder to enhance cooling.
In the preferred embodiment, the buttons in one shoulder are tungsten carbide, while the buttons in the opposite shoulder are of tool steel.

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