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| Number | Title | Issue Date |
| 7641004 | Drill bit A bit for drilling a hole. The bit includes a support member, the support member having a passageway extending substantially longitudinally therethrough; a substantially annular crown defining a crown distal end and a crown proximal end, a radially inwardly located ... | 01/05/2010 |
| 7341120 | Blade edge structure for core drill A cutting portion structure of a core drill having diamond grains may affect deformation of a tip end portion of a cutting blade after extended use. A core drill A comprises cutting blades 2 formed at an opening end portion 4 of a cylindrical core body... | 03/11/2008 |
| 7284590 | Method for manufacturing cast components A method for manufacturing cast components, in which method the cast mold and/or macroscopic inserts to be placed either totally or partly inside thereof are left totally or partly as a part of the final component to be used, after the casting the piece is further t... | 10/23/2007 |
| 7278499 | Rotary drag bit including a central region having a plurality of cutting structures A rotary drag bit including an inverted cone geometry proximate the longitudinal axis thereof is disclosed. The inverted cone region may include a central region, the central region including a plurality of cutting structures affixed thereto and arranged along at le... | 10/09/2007 |
| 7258179 | Rotary bit with an indenting member In one aspect of the invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has a recess with a side wall which is substantially coaxial with the shank portion. At least one cutting element is attach... | 08/21/2007 |
| 7225886 | Drill bit assembly with an indenting member In one aspect of the invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has a recess with a side wall which is substantially coaxial with the shank portion. At least one cutting element is attach... | 06/05/2007 |
| 7188682 | Multi-stage diffuser nozzle A multi-stage diffuser nozzle for use as a drill bit nozzle jet includes a flow restriction portion upstream of a fluidic distributor portion, and also preferably includes a transition region between these two. The flow restrictor communicates with the interior flui... | 03/13/2007 |
| 7163070 | Drill head A drill head for use in drilling bores in mines and tunnels has a bit and at least one suction opening (5) for removing drillings and having a crushing profile. ... | 01/16/2007 |
| 7131505 | Drilling with concentric strings of casing The present invention provides a method and apparatus for setting concentric casing strings within a wellbore in one run-in of a casing working string. In one aspect of the invention, the apparatus comprises a drilling system comprising concentric casing strings, wi... | 11/07/2006 |
| 7000604 | Cutting tool A cutting tool, in particular a tile cutting tool, with a base body, which can be clamped into a tool-holding device of a machine tool and driven to rotate, and with a cutting head that is set with cutting particles, and at least the cutting head and the base body a... | 02/21/2006 |
| 6595844 | Outer-diameter blade, inner-diameter blade, core drill and processing machines using same ones A core drill having a shank and a cup shaped base metal section constructed of a disk shaped top wall and a cylindrical side wall provided on a fore-end of the shank. A grinding stone portion is mounted on an outer end part of the base metal section, with... | 07/22/2003 |
| 6474425 | Asymmetric diamond impregnated drill bit A drill bit including a bit body and a plurality of blades formed in the bit body. The blades are formed, at least in part, from a base matrix material that on one embodiment is impregnated with abrasive particles. One side of the bit is formed, with resp... | 11/05/2002 |
| 6283233 | Drilling and/or coring tool A drill and/or core tool, in particular for oil drilling and/or coring, comprising a body (2) showing a substantially cylindrical peripheral surface (3) and a front (4), blades (5) which extend from the front (4) till over the peripheral surface (3) and w... | 09/04/2001 |
| 5823276 | Diamond-tipped core barrel and method of using same A relatively large diameter core barrel has a plurality of diamond cutting elements disposed around the circumference of its working end for drilling piles in very hard ground, such as metamorphic rocks and igneous rocks. Each cutting element is designed ... | 10/20/1998 |
| 5655614 | Self-centering polycrystalline diamond cutting rock bit A self-centering drill bit includes a head portion having a plurality of polycrystalline diamond compact cutting elements arranged in blades that extend outwardly away from a surface of the bit. A cavity is centrally located on the head portion and is for... | 08/12/1997 |
| 5568838 | Bit-stabilized combination coring and drilling system A core barrel having an inner tube for coring and, alternately, a center plug assembly or closing the throat of the core bit at the bottom of the assembly for drilling in lieu of coring. The inner tube assembly and plug assembly are disposable and retriev... | 10/29/1996 |
| 5505272 | Drill bits A novel form of drill bit is disclosed. The bit (30) comprises a bit body having a leading face (32) and gauge surface (44, 46). Cutting inserts (32, 34, 36) are set into the bit body, each cutting insert being in the form of a segment of a composite PCD ... | 04/09/1996 |
| 5460230 | Core bit The present invention discloses a core bit comprised of a body having blades thereon, with several cutters on each blade, and nozzles that emerge on the face of the body. The nozzles deflect liquids substantially obliquely with respect to an axis of rotat... | 10/24/1995 |
| 5025871 | Drilling method and rotary drill bit crown A rotatable crown for a rotary drill comprising a working end and an opposite end for engagement in a drill rod, stringer or adaptor coupling, the working end having a cutting face and a plurality of discrete, spaced, elongate cutting elements located in ... | 06/25/1991 |
| 5015128 | Rotary drill apparatus Rotary drill apparatus is disclosed herein which is secured to a turning shaft by an adapter plate. A cylindrical core drill body downwardly depends from the plate to terminate in a plurality of cutting teeth capable of cutting an annular groove to define... | 05/14/1991 |
| 4981183 | Apparatus for taking core samples A coring apparatus which includes a drill bit and a receiving member. The drill bit includes discrete cutting elements for cutting the outer dimension of the core. The receiving member is adapted to lie proximate to the discrete cutting surfaces and to re... | 01/01/1991 |
| 4907663 | Drilling tool A drilling tool is made up of a holder and a drilling member detachably connected together. One of the holder and the drilling member telescopes into the other. Resilient tab-like parts on one of the holder and the drill member engages within recesses in ... | 03/13/1990 |
| 4760888 | Drill bit for core boring A drill bit for core boring of the type provided with a multi-layered bit head, so constructed that when the blades of the upper-layered bit head have become worn out, it is possible to easily withdraw them without removing the bit from the bore. The core... | 08/02/1988 |
| 4723868 | Apparatus for installing circular traffic loops Apparatus for cutting a circular trough in a roadway whereby a traffic detection loop can be embedded with an advantageous round configuration. A frame for rotatably mounting a circular drill bit is pivotally engaged to a movable platform such as a single... | 02/09/1988 |
| 4681174 | Diamond crown bit A diamond-impregnated layer of the drilling bit matrix is shaped as a parallelepiped having its front and rear faces inclined. An insert is shaped as a triangular prism, one of whose side faces is rigidly coupled to a weld-on layer, also for the diamond-i... | 07/21/1987 |
| 4667755 | Drill bit having hollow cylindrical body and a plurality of PCD cutting elements A drill bit, hvaing heavy-duty cutting elements, is proposed which is intended for rotary, air-cooled application. So that the drill bit can be operated with a relatively low thrust pressure, PCD cutting elements (14) are provided which only slightly over... | 05/26/1987 |
| 4657445 | Core drill and method of removing a core therefrom Disclosed is an improved core drill and a method of detachably coupling the same to a power driving unit to expedite the removal of a core therefrom. This is achieved by equipping the rear end of the drill stem with a fixedly attached externally threaded ... | 04/14/1987 |
| 4640374 | Rotary drill bit A rotary drill bit includes a cutting face having a peripheral edge and a central recess. A plurality of fluid discharge nozzles are mounted in bores in the cutting face. A plurality of cutter elements are mounted in the peripheral edge and in the recess ... | 02/03/1987 |
| 4630692 | Consolidation of a drilling element from separate metallic components The method of forming a cutter, which includes a core and a wear resistant insert defining a body means which includes (a) applying to the body means a mixture of: (i) wear resistant metallic powder, and (ii) binder (b) volatilizing the binder, (d) and applying pre... | 12/23/1986 |
| 4552231 | Rotating pilot core bit for use in highly fractured formations Coring samples can be taken in highly fractured rock formations without physical disturbance of the coring sample as it is cut and without jamming the core within the core barrel by using a rotating coring bit characterized by a pilot portion. The pilot p... | 11/12/1985 |
| 4551045 | Countersink core drill assembly and method of utilizing same Disclosed is a core drill assembly and method of using the same to drill a countersunk hole through a concrete slab, wall or the like masonary member. The assembly utilizes concentric inner and outer core drills, the longer smaller one of which is provide... | 11/05/1985 |
| 4538691 | Rotary drill bit A rotary drill bit includes a cutting face having a peripheral edge and a central recess. A plurality of fluid discharge nozzles are mounted in the cutting face. A plurality of cutter elements are mounted in the peripheral edge and in the recess to fractu... | 09/03/1985 |
| 4534773 | Abrasive product and method for manufacturing An abrasive body is provided which has high strength and an ability to withstand high temperatures making it suitable as a tool insert for dressing tools and surface set drill bits. The body comprises a mass of diamond particles present in an amount of 80... | 08/13/1985 |
| 4499959 | Tooth configuration for an earth boring bit A polycrystalline diamond cutting element in an earth boring bit is affixed to the bit face by an improved tooth. The tooth includes a prepad extending from the face of the mining bit contiguous to and substantially congruous with that portion of a polycr... | 02/19/1985 |
| 4352400 | Drill bit A drill bit (10) comprises a cast body (12) with full length wide overlapping integral spiral stabilizer lands (14) between intervening spiral grooves (16), integral short, strong, stubby spiral fingers (18) reinforced by additional web portions (12a) ang... | 10/05/1982 |
| 4281722 | Retractable bit system A retractable bit system that includes a single piece annular core bit that is movable through a drill string (drill stem), had an outer diameter about the same as that of the drill stem, and can be releasably locked to the drill string, an outer barrel a... | 08/04/1981 |
| 4274769 | Impregnated diamond drill bit construction An impregnated diamond drill bit having a generally cylindrical, hollow crown structure with a lower portion containing diamond particles and a steel shank attached to the crown structure at its upper end. The diamond particles are dispersed within a meta... | 06/23/1981 |
| 4211294 | Impregnated diamond drill bit An impregnated diamond drill bit having a crown containing a plurality of diamond particles. The crown is formed from a fused powdered metallic matrix that includes titanium carbide and a nickel-manganese alloy. The diamond particles are dispersed within ... | 07/08/1980 |
| 4208154 | Core drill Improved core drills and core drill elements. The core drill is of the type having a carrying drill tube and at least one cutting element attached to one end of drill tube. In the present invention, structural means are provided on one end surface of the ... | 06/17/1980 |
| 4207954 | Core bit having axial conical core breaker A drilling tool comprising a body having a leading face with a central recess providing the body with an annular leading cutting edge such that during drilling a central core is formed, and a central cone positioned axially in the recess for breaking up t... | 06/17/1980 |
