Mechanically locked drill bit components
AssigneeBaker Hughes Incorporated
InventorsGordon A. Tibbitts, Paul E. Pastusek
Life of this patent
Estimating the term…
Abstract
Mounting apparatus is described for locking an insertable stud cutter or slug cutter or fluid nozzle into a socket on a rotatable earth boring drill bit. The cutter may be readily removed and replaced without damaging either the cutter, nozzle or bit. Apparatus are shown for permitting or, alternatively, preventing rotation of the cutter or nozzle in its socket. The mounting apparatus is particularly applicable to cutters having a cutting disk of polycrystalline diamond or other superabrasive material mounted on a carbide supporting body, or carbide body nozzles or nozzles having a bore lined with such a material.
Claims19
A structure for lockable attachment of a component to an earth boring drill bit, comprising
- a stem having a longitudinal axis intersecting an outer end and an insertion end thereof said stem having a radially sloped circumferential shoulder surface between said outer end and said insertion end, said shoulder surface circumscribing a major portion of a circumference of said stem and configured to intercept and abut a locking structure.
A mounting structure for a drag bit component, comprising:
- a stem having a longitudinal axis intersecting an outer end and an insertion end thereof said stem including a locking surface adjacent said insertion end having hard radial projections thereon;
- an aperture on said bit component having a lower radial recess of enlarged diameter;
- an annular element inserted in said lower radial recess, said element comprising material softer than said projections;
- and
- wherein said projections are frictionally held by said annular element to removably lock said stem in said aperature.
A mounting structure for a component on an earth boring drill bit, comprising:
- a truncated conical body with a longitudinal central axis of rotation intersecting an outer end and an insertion end thereof;
- helical threads formed on said conical body adjacent said outer end;
- a truncated conical aperture formed on said drill bit, said aperture having an upper conical portion with helical screw threads adapted to receive said screw threads of said body;
- and
- at least one keyway in each of said body and said aperture, said keyways cooperating to receive a key for lockably retaining said body within said aperture in a non-rotatable position.
A mounting structure for a component on an earth boring drill bit, comprising:
- an elongated body having a longitudinal axis of rotation intersecting an enlarged outer end and a reduced insertion end of said body;
- a helical screw thread formed on said body adjacent said insertion end;
- an aperture on said drill bit, said aperture having a bottom cylindrical bore of reduced diameter having a helical screw thread in a portion thereof and adapted to receive said insertion end, said aperture helical screw thread corresponding to said helical screw thread of said body;
- and
- cooperating keyway structure in said body and said aperture, said keyway structure cooperating to receive a key for lockably retaining said body within said aperature in a non-rotatable, axially immobile position.
A mounting structure for a component for an earth boring drill bit, comprising:
- a body having a longitudinal axis of rotation intersecting an outer end and an opposed threaded cylindrical insertion end of said body;
- separable structure in a tip portion of said insertion end for separation into a plurality of finger sectors swageable radially away from said longitudinal axis;
- and
- an aperture on said drill bit, said aperture having a lower threaded portion adapted to receive said threaded cylindrical insertion end of said body, and including in a lowermost end thereof a conically shaped slot diverging downwardly from said axis;
- wherein upon screwing said body into said aperture, said finger sectors are swaged into said slot to be separated and flared therein to lock said body in said aperture.
Dependencies are inferred from the claim text.