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7628228 |
Core drill bit with extended crown height
Core drill bits with long crown heights are described herein. The core drill bits have a series of slots or openings that are not located at the tip of the crown and are therefore enclosed in the...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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4189015 |
Drill bits for obtaining core samples
A drill bit used for obtaining core samples in concrete or rock formations. The drill bit comprises a cylindrical body having a generally annular-shaped cutting surface at one end and at least one...
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4128136 |
Drill bit
A diamond drill coring bit having an annular crown and inner and outer concentric side surfaces. The crown is formed from a number of radially extending composite segments spaced apart...
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4056152 |
Drill bit for reinforced concrete
A rotary bit for drilling concrete and reinforced concrete having a hollow drill stem with a transversely disposed drilling face at its outer end, the face having annularly disposed sawtooth...
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4006788 |
Diamond cutter rock bit with penetration limiting
A rock bit for recovering core samples is described, along with variations for drilling oil wells or the like. In each of these embodiments a plurality of diamond cutters are mounted on the bit...
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3833074 |
REMOTELY ACTUATED DEVICE FOR SURVEYING UNDERGROUND STRATA
Device for taking cores of the ground formations at different levels of a well, adapted to be operated successively as a drilling apparatus and as a coring apparatus and comprising remotely...
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3833073 |
FLOOR TAP INSERT DRILL
Drill for successively drilling holes of different diameters. A circular hole saw is affixed to one end of a shaft, and a cylindrical core bit is slidably mounted on the shaft and movable between...
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3743036 |
DIAMOND BIT WITH ANNULAR MUD DISTRIBUTING GROOVE
In a full hole diamond bit of the type provided with a core ejector an improved mud distribution system includes two sets of mud channels communicating with an annular groove concentric with the...
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3736995 |
DIAMOND-IMPREGNATED MASONRY BIT WITH RADIALLY-STEPPED CUTTING FACES
A masonry core drilling bit for cutting through cast concrete into preplaced utility conduit cells beneath the surface. The bit has two concentric, axially offset, end cutting faces on a unitary...
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3692127 |
ROTARY DIAMOND CORE BIT
Described is an improved rotary diamond core bit offering longer life in dry and in chip flush drilling. Grade AAAA dodecahedron diamonds within the range of 18 to 22 diamonds per carat size, each...
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3664438 |
UNDERWATER ROCK CORE SAMPLING DEVICE AND METHOD OF USE THEREOF
A rotary diamond rock core drill capable of obtaining a three-quarter inch iameter core four inches long at any depth down to 6,000 feet is provided. The drill is adapted to be used with manned...
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3635296 |
DRILL BIT CONSTRUCTION
A drill bit construction, particularly adapted to rotary drill bits employing diamonds or like cutting elements includes a secondary cutting means disposed within the bit body and independently...
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3565192 |
EARTH BORING MECHANISM AND COORDINATED PILOT HOLE DRILLING AND CORING MECHANISMS
A cylindrical member is lowerable through a drill pipe and latched thereto. Cutters carried on arms hinged to slots in the cylindrical member move outwardly under pressure of the drill fluid...
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3537538 |
IMPREGNATED DIAMOND BIT
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3495359 |
CORE DRILL
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3433331 |
DIAMOND DRILL BIT
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3322218 |
Multi-port diamond bit
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3308896 |
Drilling bit
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3306380 |
Core drill
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