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US 4,395,076 AGranted
Bearing design for drill bit
OwnerDaniel R. Sabreinventor
Life of this patent
Estimating the term…
Abstract
A bearing construction for a rotary earth boring drill bit is constructed of a bearing journal and a cutter rotatively mounted on the bearing journal, the bearing journal having a generally cone-shaped bearing wall formed by a plurality of steps comprised of a pair of adjacent walls joined at an apex having an acute included angle, and the cutter having a bearing wall formed with a plurality of steps mating in bearing contact with the steps of the bearing journal.
Claims9
A rotary earth boring drill bit comprising
- a bit body having at least one apron,
- a bearing journal extending from said apron, and
- a rotary cone cutter rotatively mounted on said bearing journal,
- said bearing journal having a generally cone-shaped bearing wall formed by a plurality of steps extending along said bearing wall,
- each of said steps comprising a pair of adjacent walls joined at an apex having an acute included angle,
- said cutter having a bearing wall cooperating with said bearing wall of said bearing journal and formed with a plurality of steps mating in bearing contact with said steps of said bearing journal.
3 more elements
Dependencies are inferred from the claim text.