| Patent Number |
Title Of Patent |
Date Issued |
| 4657093 |
Rolling cutter drill bit |
April 14, 1987 |
| This invention discloses a rolling cone drilling bit having a plurality of cutters which have inserted therein hard metal cutting elements preferably formed of tungsten carbide alloy; and in which bit the rolling cone cutters are located in such a manner that their rotational axes are |
| 4611673 |
Drill bit having offset roller cutters and improved nozzles |
September 16, 1986 |
| This invention discloses a rolling cone drilling bit comprising a plurality of conical roller cutters having hard metal cutting elements thereon and being so positioned relative to each other that their rotational axes are offset from the rotational axis of the drill bit, and a drilling |
| 4582149 |
Drill bit having replaceable nozzles directing drilling fluid at a predetermined angle |
April 15, 1986 |
| A nozzle system for a rotary drill bit comprising a plurality of elongate nozzle members detachably secured in drilling fluid exit bores in a drill bit body, each nozzle member having passaging therein, the lower portion of which is angled relative to the longitudinal axis of the nozzle |
| 4558754 |
Drill bit having angled nozzles |
December 17, 1985 |
| A rotary drill bit comprising a bit body adapted to be secured to a drill string and to receive drilling fluid under pressure therefrom, the body having a plurality of nozzles for exit of the drilling fluid, and a plurality of depending legs at its lower end. The bit further includes a |
| 4556424 |
Cermets having transformation-toughening properties and method of heat-treating to improve such |
December 3, 1985 |
| A powder metallurgy composite material comprising grains of a relatively hard material and a binder for binding the grains together, the binder being metastable and transformable at ambient temperature by the application of mechanical force from an initial state in which the major ph |
| 4554986 |
Rotary drill bit having drag cutting elements |
November 26, 1985 |
| A rotary drill bit comprising a bit body having a plurality of drag cutting elements mounted on the bottom thereof. Each cutting element has a portion projecting down below the bit body and forward generally in the direction of rotation of the bit. This portion presents a leading face an |
| 4548280 |
Drill bit having a failure indicator |
October 22, 1985 |
| A drill bit comprising a bit body detachably secured to a drill string having a chamber therein to receive drilling fluid at a first pressure from the drill string, a nozzle for exit of the drilling fluid to the space between the bit body and the well bore at a second pressure lower |
| 4542798 |
Nozzle assembly for an earth boring drill bit |
September 24, 1985 |
| A nozzle assembly for an earth boring drill bit of the type adapted to receive drilling fluid under pressure and having a nozzle bore in the bottom thereof positioned closely adjacent the well bore bottom when the bit is in engagement therewith with the bore having inner and outer po |
| 4516642 |
Drill bit having angled nozzles for improved bit and well bore cleaning |
May 14, 1985 |
| A rotary drill bit comprising a bit body having a chamber therein adapted to receive drilling fluid under pressure, a plurality of nozzles in communication with the chamber for exit of the drilling fluid, and a plurality of depending legs at its lower end, each having a bearing journ |
| 4514097 |
Friction bearing assembly having a series of rings constituting a bushing therefor |
April 30, 1985 |
| A friction bearing assembly for a roller cutter drill bit, comprising a first bearing member of cylindrical configuration and a second bearing member having an opening of generally circular section therein receiving the first member for enabling relative rotation of the members. A bushin |
| 4495840 |
Bit breaker |
January 29, 1985 |
| A bit breaker adapted to be fitted in the Kelly drive of a drill rig for detachably securing a rotary drill bit to the Kelly drive to enable the latter to rotate the bit relative to a drill string having an internally threaded lower end portion in one direction to effect a threaded c |
| 4466622 |
Compound dynamic seal for rolling cutter drill bit |
August 21, 1984 |
| A seal assembly for a rotary drill bit of the type comprising a bearing journal constituting a first bearing member, and roller cutter having a blind end bore therein, constituting a second bearing member, receiving the journal and an annular recess at the open end of the bore, the annul |
| 4452323 |
Valve assembly for drill bit lubrication system |
June 5, 1984 |
| A valve system is disclosed for use in the lubrication passages of a rolling cutter drill bit, which valve assembly utilizes one or more reed valves to maintain flow of lubricant in a desirable direction. |
| 4444281 |
Combination drag and roller cutter drill bit |
April 24, 1984 |
| A rotary drill bit comprising a bit body having at least one depending leg at its lower end and at least one roller cutter rotatably mounted on the leg. The roller cutter comprises a frustoconical roller cutter body and a plurality of cutting elements projecting from the cutter body to t |
| 4427221 |
Drill bit nozzle retention and alignment system |
January 24, 1984 |
| A nozzle retention system is disclosed which serves to retain a jet nozzle in a drilling bit and also align the nozzle with respect to the bit cutters, said system utilizing a deformable pin and interacting channels in the nozzle and the bit nozzle bore. |
| 4420050 |
Oil well drilling bit |
December 13, 1983 |
| An oil well drilling bit is disclosed of the type utilizing hard metal inserts in the rolling cutters wherein each row of inserts on each cutter is located thereon in a sinusoidal or varying pattern rather than the strictly circumferential pattern of the prior art. |
| 4417629 |
Drill bit and method of manufacture |
November 29, 1983 |
| A method of making a rolling cutter drill bit involving the steps of forming a body member having an upper portion adapted to be threaded and passaging therein, forming at least one arcuate recess in the lower end of the body member, providing a lug assembly comprising a lug member havin |
| 4412590 |
Rock bit internal lubricant pump |
November 1, 1983 |
| A rolling cutter rock drilling bit is disclosed which features an internal lubricant pump utilizing an internal elastomeric member moving across a grooved rigid surface to circulate lubricant in the bit bearings as a result of the shear forces on the lubricant created when the elastomer |
| 4398952 |
Methods of manufacturing gradient composite metallic structures |
August 16, 1983 |
| A method is disclosed for forming roller cutters and also for forming cutting teeth for rolling cutter bits, including cutter inserts, cutter teeth formed in place, or formed separately and welded in place, etc., by powder metallurgy as a densified powder metallurgical composite of at |
| 4381824 |
Drill bit lubrication system |
May 3, 1983 |
| A lubrication system is disclosed for a rolling cutter drill bit, which system utilizes solid or semi-solid sticks of lubricants located in internal channels and continuously biased against rotating surfaces in the bit. |
| 4372404 |
Cutting teeth for rolling cutter drill bit |
February 8, 1983 |
| Cutting teeth for rolling cutter bits, including cutter inserts, cutter teeth formed in place, or formed separately and welded in place, etc., are formed by powder metallurgy as a densified powder metallurgical composite of at least two varying phases, said composite having a substantial |
| 4372402 |
Combination fluid nozzle and backflow valve |
February 8, 1983 |
| A valve-nozzle assembly is disclosed for use in a rock-drilling bit, which assembly utilizes a backflow valve with a replaceable nozzle insert. |
| 4369849 |
Large diameter oil well drilling bit |
January 25, 1983 |
| The present invention discloses a large diameter oil well drilling bit which utilizes a unique cast body upon which are secured a plurality of cutting assemblies comprising a leg, a bearing journal and a rolling cutter mounted on the bearing journal. |
| 4368788 |
Metal cutting tools utilizing gradient composites |
January 18, 1983 |
| A rolling cutter drill bit is disclosed having cutters manufactured by powder metallurgy techniques, said cutters having gradient composite metallic structures in the cutting areas arranged to reduce or eliminate physical and metallic discontinuities and stress risers. |
| 4356034 |
Method of reducing defects in powder metallurgy tungsten carbide elements |
October 26, 1982 |
| A method is disclosed for manufacturing cutting elements of powdered tungsten carbide which involves sintering the powder into a solid element and then thermo-cycling the part to reduce internal defects. |
| 4334586 |
Inserts for drilling bits |
June 15, 1982 |
| Inserted hard metal cutting elements are disclosed which are advantageous for inserting into the cutters of drilling bits used in drilling underground formations. The inserted cutting elements comprise asymmetrical inserts placed in at least one row of a cutter in alternating alignme |
| 4323284 |
Thrust face bearing structure for rolling cutter drill bit |
April 6, 1982 |
| A rolling cutter drill bit is disclosed having an improved thrust face bearing structure which utilizes alternating segments of at least two different bearing metals. The composite thrust face bearing structure disclosed has a first metal selected for a low temperature operation, and |
| 4306727 |
Dynamic seal for rolling cutter drill bit |
December 22, 1981 |
| A dynamic seal is disclosed for sealing between a rotating cutter and a drill bit journal in an underground formation drilling bit, which seal utilizes a static elastomeric seal ring abutting a metal seal ring having a dynamic sealing face. |
