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US 6,782,959 B2Granted
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 crest that defines a crest line. The crest can be non-rectilinear. The crest line of each cutter element defines an angle with respect to the axis of the rolling cone on which the cutter element is mounted. The cutter elements define different angles with respect to the cone axis and with respect to each other.
Claims15
A drill bit comprising:
- a bit body;
- at least one roller cone rotatably mounted on a cantilevered bearing shaft depending from said bit body, said roller cone having a cone axis;
- a first cutter element extending from a primary row in said roller cone, said first cutter element having a base portion adapted to fit into a corresponding socket on said roller cone and a crest portion defining a first crest line, said first crest line defining a first angle with respect to a projection of said cone axis;
- and
- a second cutter element extending from a primary row in said roller cone, said second cutter element having a base portion adapted to fit into a corresponding socket on said roller cone and a crest portion defining a second crest line, said second crest line defining a second angle with respect to a projection of said cone axis;
- wherein said first and second angles are different.
3 more elements
A drill bit comprising:
- a bit body;
- at least one roller cone rotatably mounted on a cantilevered bearing shaft depending from said bit body, said roller cone having a cone axis;
- a first cutter element extending from a primary row in said roller cone, said first cutter element having a base portion adapted to fit into a corresponding socket on said roller cone and a crest portion defining a first crest line, said first crest line defining a first angle with respect to a projection of said cone axis;
- and
- a second cutter element extending from a primary row in said roller cone, said second cutter element having a base portion adapted to fit into a corresponding socket on said roller cone and a crest portion defining a second crest line, said second crest line defining a second angle with respect to a projection of said cone axis;
- wherein said first and second angles are different and at least one cutter element has an extending portion having a non-positive draft;
- and
- wherein no cutter elements define the same angle with respect to a projection of the cone axis.
5 more elements
Dependencies are inferred from the claim text.