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US 5,178,222 AGranted
Drill bit having enhanced stability
AssigneeBaker Hughes Incorporated
InventorsMark L. Jones, Wayne R. Hansen
Life of this patent
Estimating the term…
Abstract
The present invention is a drill bit having a multi-level gage defining the outermost radius of the bit, at least one portion of the gage extending longitudinally closer to the bit face than another portion.
Claims8
A rotary drill bit for subterranean earth boring, comprising:
- a crown disposed below a pin, said rotary drill bit defining a longitudinal axis therebetween;
- a face on said crown extending from said longitudinal axis radially outwardly and terminating in a longitudinally extending gage defining the diameter of said bit, said face including a first peripheral portion having cutting elements disposed thereon immediately adjacent and extending radially outwardly to said diameter and a second peripheral portion being devoid of cutting elements in the area immediately adjacent said diameter, said gage at said second peripheral portion extending longitudinally downwardly to a radial plane adjacent that of said cutting elements on said first peripheral portion.
A rotary drill bit for boring subterranean formations, comprising:
- a pin having a crown disposed thereon, together defining a longitudinal bit axis;
- said crown including a face extending radially outwardly from said longitudinal bit axis and peripherally terminating at a longitudinally extending gage;
- and
- cutting elements disposed on said bit face proximate said longitudinal bit axis, said gage extending longitudinally toward said face to a position at least radially adjacent to said cutting elements proximate said longitudinal bit axis.
1 more element
A drill bit for boring subterranean formations, comprising:
- a longitudinal bit axis;
- a pin having a crown secured therebelow, said crown having a gage, and a profile disposed at an angle .alpha. from a radial plane transverse to said bit axis;
- said profile having cutting elements disposed thereon proximate said bit axis;
- and
- said profile angle .alpha. being sufficiently large that said profile and said gage meet at a point substantially radially adjacent at least one of said cutting elements proximate said bit axis.
2 more elements
Dependencies are inferred from the claim text.