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US 5,678,645 AGranted
Mechanically locked cutters and nozzles
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.
Claims33
A mounting structure for a cutting apparatus for an earth boring drill bit, comprising:
- a stem having a longitudinal axis intersecting a cutting end and an insertion end;
- a cutting element fixed to said cutting end;
- a socket on said bit for receiving said stem;
- and
- locking structure for removably and replaceably locking and retaining said stem in said socket, said locking structure aligned at an angle to said longitudinal axis to prevent rotation of said stem.
2 more elements
A cutting apparatus for lockable attachment to an earth boring drill bit, comprising:
- a stem having a longitudinal axis intersecting a cutting end and an insertion end, said stem having a radially sloped circumferential shoulder surface partially longitudinally extending between said cutting end and said insertion end, said shoulder surface circumscribing a major portion of the circumference of said stem and configured to intercept and abut a locking structure;
- a cutting element fixed to said cutting end for projection from said drill bit;
- and
- a socket on said drill bit, said socket configured to accept said insertion end and including an arcuately undercut recess extending generally radially from said socket normal to said longitudinal axis and configured to intercept and abut said locking structure.
1 more element
A mounting structure for a cutting apparatus on an earth boring drill bit, comprising:
- a generally truncated conical root with a longitudinal axis;
- a cutting element fixedly mounted on the larger end of said conical root;
- a friction weldable metal member attached to the smaller end of said conical root;
- and
- a socket on said drill bit, said socket having an upper sidewall surface and an enlarged lower radial space with a frictional surface for rotational frictional contact of said metal member thereagainst to soften and expand said metal member into said enlarged lower radial space and to lock said root into said socket via subsequent cooling and hardening of said metal member.
2 more elements
A mounting structure for cutting apparatus on a drag bit, comprising:
- a stem having a longitudinal axis intersecting a cutting end and an insertion end, said stem including a locking surface adjacent said insertion end having hard radial projections thereon substantially transverse to the longitudinal axis;
- a cutting element fixed to said cutting end of said stem;
- a socket on said bit 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 socket.
3 more elements
A mounting structure for a cutting apparatus on an earth boring drill bit, comprising:
- a truncated conical cutter body with a longitudinal central axis of rotation intersecting a cutting end and an insertion end;
- a cutting element fixed to said cutting end for projection from the body of a drag bit;
- helical threads formed on said conical cutter body adjacent said insertion end;
- a truncated conical socket formed on said drill bit, said socket having an upper conical portion with helical screw threads adapted to receive said screw threads of said cutter body;
- and
- at least one keyway in each of said cutter body and said socket, said keyways cooperating to receive a key for lockably retaining said body within said socket in a non-rotatable position.
3 more elements
A mounting structure for a cutting apparatus on an earth boring drill bit, comprising:
- an elongated cutter body having a longitudinal axis of rotation intersecting an enlarged cutting end and a reduced insertion end of said cutter body;
- a helical screw thread formed on said cutter body adjacent said insertion end;
- a cutting element fixedly mounted on said enlarged cutting end;
- a socket on said drill bit, said socket having a bottom cylindrical bore of reduced diameter having helical screw thread in the upper portion thereof and adapted to receive said insertion end, said socket thread corresponding to said helical screw thread of said cutter body;
- and
- cooperating keyway structure in said cutter body and said socket, said keyway structure cooperating to receive a key for lockably retaining said cutter body within said socket in a non-rotatable, axially immobile position.
3 more elements
A mounting structure for a cutting apparatus for an earth boring drill bit, comprising:
- a cutter body having a longitudinal axis of rotation intersecting a cutting end and an opposed threaded cylindrical insertion end of said stud cutter body;
- a cutting element fixedly attached to said cutting end;
- separable structure in the tip portion of said insertion end for separating said tip into a plurality of finger sectors swageable radially away from said longitudinal axis;
- and
- a socket on said drill bit, said socket having a lower threaded portion adapted to receive said threaded cylindrical insertion end of said cutter body, and including in the lowermost end a conically shaped slot diverging downwardly from said axis to form a conical socket base;
- wherein upon screwing said cutter body into said socket, said finger sectors are swaged by said upwardly directed conical socket base into said slot to be separated and flared therein to lock said cutter body in said socket.
3 more elements
A resilient cutting apparatus mounting structure for an earth boring drill bit, comprising:
- an elongate compliant stem mounted on the body of a drill bit to project generally perpendicular to applied drilling forces, said stem having a central axis intersecting a cutting end and a mounting end;
- a cutting element fixedly attached to said cutting end;
- and
- a stop mounted on a drill bit body member to contact said compliant stem during bending thereof, to limit said bending.
1 more element
A resilient mounting structure for cutting apparatus for an earth boring drill bit, comprising:
- a cutter body having a longitudinal axis intersecting an enlarged cutting end and an opposed insertion end of smaller diameter in said cutter body;
- a cutting member fixedly mounted on said cutting end;
- a toroid of resilient material surrounding said insertion end adjacent said enlarged cutting end and aligned at an angle to said longitudinal axis to prevent rotation of said cutter body;
- locking structure for locking said insertion end in a through socket formed in the body of a drag bit;
- and
- a socket on said drill bit, said socket having an enlarged portion for accepting said enlarged cutting end of said cutter body and said annulus therein, and a smaller diameter portion for passage of said insertion end therethrough.
3 more elements
A mounting structure for a cutting apparatus for an earth boring drag bit, comprising:
- a cutter body having an enlarged portion with a cutting end and a root of reduced diameter with an insertion end;
- a cutting member fixedly mounted on said enlarged cutting end;
- structure for removably locking said cutter body within a through socket;
- and
- a through socket in a drill bit, comprising an enlarged space for retaining said enlarged portion, and a through hole of reduced diameter having an exit on the surface of said bit, for passage of said insertion end therethrough and removably locking said stud cutter insertion end in tension.
2 more elements
Dependencies are inferred from the claim text.