Rotary cone drill bit with machined cutting structure
AssigneeDresser Industries, Inc.
InventorWilliam C. Saxman
Life of this patent
Estimating the term…
Abstract
A rotary cone drill bit is provided with at least one cutter cone assembly having a machined cutting structure which will maintain an effective cutting profile despite abrasion, erosion and/or wear of the associated cutting elements. The machined cutting structure may be formed on a generally cone shaped blank by a series of lathe turns and/or plunge cuts. The cutting elements may be formed with an aggressive cutting profile. For one application, the crest of each cutting element has the general configuration of an ogee curve. A layer of hardfacing material may be applied over all or selected portions of the machined cutting structure.
Claims7
A rotary cone drill bit having at least one cutter cone assembly defined in part by a base portion, a nose, and a generally tapered, conical surface extending from the base portion to the nose, comprising:
- a machined cutting structure formed on the generally tapered, conical surface;
- the cutting structure having a first row of cutting elements circumferentially disposed adjacent to the base portion and a second row of cutting elements circumferentially disposed on the generally tapered conical surface at a location intermediate the base portion and the nose;
- each cutting element having a crest with a cutting profile which defines a generally sinusoidal or interrupted sinusoidal surface;
- and
- each cutting element having a pair of sides which extend substantially normal to the tapered conical surface.
A rotary cone drill bit comprising:
- a cutter cone having concentric rings of cutting elements, said cutting elements having a crest with a generally sinusoidal shape;
- wherein said cutting elements have two sides which are substantially normal to a surface from which they extend.
A rotary cone drill bit comprising:
- a cutter cone having a plurality of cutting elements, said cutting elements having a crest with a generally s-shaped surface;
- wherein said cutting elements have two sides which are substantially normal to a surface from which they extend.
Dependencies are inferred from the claim text.