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US 2003/0188896 A1Published application
Cutter element with non-linear, expanded crest
AssigneeSmith International, Inc.
InventorsJames C. Minikus, Chris E. Cawthorne, Stephen C. Steinke, Gary R. Portwood, Gary E. Garcia, David P. Moran, Quan V. Nguyen
Life of this patent
Estimating the term…
Abstract
A cutter element for a drill bit has a non-rectilinear crest. The cutter element has a base portion and an extending portion and the extending portion has either a zero draft or a negative draft with respect to the base portion. The non-positive draft allows more of the borehole bottom to be scraped using fewer cutter elements. The cutter elements having non-positive draft can be either tungsten carbide inserts or steel teeth.
Claims13
A drill bit comprising:
- a bit body;
- at least one roller cone rotatably mounted on a cantilevered bearing shaft depending from said bit body;
- and
- at least one cutter element extending from a primary row in said roller cone, said cutter element having a base portion adapted to fit into a corresponding socket on said roller cone and a non-rectilinear crest.
1 more element
Dependencies are inferred from the claim text.