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| Number | Title | Issue Date |
| 8113301 | Jetted underreamer assembly An underreamer for earth boring operations has a tubular body with a passage extending through it. Arms are pivotally mounted to the body and movable between retracted and extended positions. An actuator mandrel, located within the passage in the body, pushes the ar... | 02/14/2012 |
| 7681667 | Drilling apparatus Drilling apparatus, such as an underreamer comprises a generally cylindrical tubular body and two cutting blades pivotally mounted to the body and movable between a retracted position and an extended position. Each cutting blade has a retracted position minimum gaug... | 03/23/2010 |
| 7357012 | Methods and assemblies for bending strands of material A method for bending strands of material. The method includes providing a first pair of opposing dies each comprising a first surface corresponding to a first pair of predetermined bends to be formed in a first strand of material, positioning the first strand of mat... | 04/15/2008 |
| 7293616 | Expandable bit An expandable drill bit for use with earth drilling equipment. The bit includes arms held in a closed position, so that the bit may be inserted through casing or a small bore hole. The arms are expandable to create an expanded drill bit having a crown profile common... | 11/13/2007 |
| 7195085 | Drill bit An expandable drill bit comprises a body for mounting on a support string and two roller cutters mounted on the body. The cutters are movable between a smaller diameter first configuration and a larger diameter second configuration. In one embodiment the bit is adap... | 03/27/2007 |
| 7188690 | Drilling device and method for producing undercut holes A drilling device for producing undercut holes. The drilling device includes a drilling tool having an axis of rotation and a cutting portion arranged such that the cutting portion drills a hole with a longitudinal axis that is radially offset with respect to said a... | 03/13/2007 |
| 7100713 | Expandable apparatus for drift and reaming borehole An expandable reamer shoe is provided for use with expandable casing in a borehole. The reamer shoe has a number of reaming members in the form of blades which remain closed against the body of the shoe when inserted through casing, and can then be expanded to under... | 09/05/2006 |
| 6929076 | Bore hole underreamer having extendible cutting arms A bore hole underreamer is provided having a hollow body with a longitudinal axis, which has an external wall, at least two cylindrical bores provided through the external wall and whose axes are transverse to the longitudinal axis. Each of the bores have a cylindri... | 08/16/2005 |
| 6920923 | Section mill for wells A section mill for casings used in oil wells to cut predetermined portions for repair purposes. An elongated cylindrical assembly is inserted through the casing and it includes at least two spaced apart apertures with one blade member pivotally mounted within each a... | 07/26/2005 |
| 6851492 | Fastener, hammering jig for installing the fastener, and drill bit for working undercut hole In a fastener of a post-installation type which is embedded after a drilled hole is provided at concrete structure, a sleeve (2) and a plug (3) press-fitted to the sleeve are positioned by convexoconcave engagement between a projecting portion at an in... | 02/08/2005 |
| 6561286 | Well bore reamer and method Disclosed are an expandable well bore reamer and method utilizing a pair of reaming blades pivotally mounted on a central support member, each blade having an inner and an outer mounting arm positioned on opposite sides of such central support member with... | 05/13/2003 |
| 6439323 | Seismic shothole reaming module An apparatus for shaping boreholes used in seismic operations. A drill body is attached to a drill bit and is movable in axial and rotational directions. Selective operation of the drill body causes a moveable sleeve to operate a reaming bit to extend thr... | 08/27/2002 |
| 6394197 | Reverse circulation drilling system with bit locked underreamer arms A underreamer drill bit assembly including a pilot bit and extendable underreaming arms operatively connected to the pilot bit. The underreaming arms have an extended position for underreaming, and a retracted position in which the overall diameter of the... | 05/28/2002 |
| 6209665 | Reverse circulation drilling system with bit locked underreamer arms A underreamer drill bit assembly including a pilot bit and extendable underreaming arms operatively connected to the pilot bit. The underreaming arms have an extended position for underreaming, and a retracted position in which the overall diameter of the... | 04/03/2001 |
| 5975222 | Reverse circulation drilling system with bit locked underreamer arms A drill bit assembly includes a driver adapted for attachment to a down hole pneumatic hammer. A pilot bit is coupled to the driver in a manner permitting rotational and axial movement between driver and pilot bit. A series of underreamer arms are dispose... | 11/02/1999 |
| 5853054 | 2-Stage underreamer A 2-stage underreamer for use in a subterranean wellbore includes a unitary body having upper and lower blades mounted in slots formed perpendicular to each other in the body. Separate upper and lower piston assemblies are provided for driving the blades ... | 12/29/1998 |
| 5787999 | Drill bit with set of underreamer arms A drill bit assembly includes a driver adapted for attachment to a down hole pneumatic hammer. A pilot bit is coupled to the driver in a manner permitting rotational and axial movement between driver and pilot bit. A series of underreamer arms are dispose... | 08/04/1998 |
| 5735650 | Drill bit for drilling an undercut hole A drill bit including a body, a drill bit fixed onto the body, a thrust transmitting member arranged on the body and having a contact portion, and an undercut cutting member housed in a guide groove provided in the side face of the drill bit. The undercut... | 04/07/1998 |
| 5560440 | Bit for subterranean drilling fabricated from separately-formed major components A rotary bit for drilling subterranean formations. The bit includes a separately-fabricated bit body and cutter support structures, the latter of which may be designed as blades, ribs, pads or otherwise, depending upon the bit style. The body and one or m... | 10/01/1996 |
| 5361859 | Expandable gage bit for drilling and method of drilling A drill bit for use with earth drilling equipment, the drill bit having a body and movable cutting members or blades variably positionable between a first position in which the diameter defined by the cutting members is generally equal to or less than the... | 11/08/1994 |
| 5141063 | Restriction enhancement drill An expandable drill bit for cleaning solidified cement from a well casing used in oil drilling operations. The bit has an initial diameter which allows it to be passed through a permanent restriction in a well casing and thereafter expanded to clean out t... | 08/25/1992 |
| 5107943 | Method and apparatus for gravel packing of wells A well penetrator has a housing moveable down a well casing with a radially moveable punch being supported in the housing for movement between retracted and extended positions; a fluid jet is discharged from the outer end of the punch with liquid for the ... | 04/28/1992 |
| 5060738 | Three-blade underreamer An underreamer tool has a generally cylindrical body with a threaded top end for connection to a tubing string, a threaded lower portion to receive a drill bit, and a longitudinal fluid passageway extending centrally through the body. The body has three f... | 10/29/1991 |
| 5036921 | Underreamer with sequentially expandable cutter blades An underreamer tool has a body with upper and lower portions having an upper cutter blade slot extending transversely through the upper portion and a lower cutter blade slot extending transversely through the lower portion at a right angle thereto. The up... | 08/06/1991 |
| 4998981 | Bit for drilling an undercut hole A drill bit has an extendable and retractable undercut portion for the drilling of undercut holes, for example to accommodate anchor bolts in concrete. The device includes a drill bit (18) for drilling an initial hold (B) to a predetermined depth at which... | 03/12/1991 |
| 4992010 | Device for forming an undercut in a drilled hole A device for forming an undercut in a drilled hole comprises a stem having a pivotal reaming element at a lower end thereof, and a guide tube in which the stem is longitudinally displaceable with the reaming element pivoting radially outwards from the gui... | 02/12/1991 |
| 4846290 | Underreamer with revolving diamond cutter elements A sub-surface borehole underreamer is disclosed having freely rotatable precessing diamond cutters attached to extendable arms connected to the body of the underreamer. The diamond cutting face is skewed to a degree that tangential contact of the peripher... | 07/11/1989 |
| 4842082 | Variable outside diameter tool for use in pikewells An apparatus for use in energy exploration is disclosed which is used where a radially expanding device is required, for example in a stabilizer, retriever or an underreamer. The apparatus comprises a support tubular member for connection to a drilling st... | 06/27/1989 |
| 4819744 | Funnel hole ice auger An ice auger includes a pair of ice boring blades fixedly attached to the bottom of a straight inner auger drive bar. A brace and bit arrangement at the top of the drive bar is for rotating the drive bar and either forcing it down toward the ice to bore a... | 04/11/1989 |
| 4646826 | Well string cutting apparatus A well cutting tool for cutting casing in a well bore having a cutter body and at least one cutting arm pivotally mounted in a longitudinally extending slot of the cutter body. The cutting arm has removable and replaceable cutting inserts positioned along... | 03/03/1987 |
| 4640373 | Bore head for deep-hole boring The present invention deals with a bore head for deep-hole boring, in which a plurality of circumferentially spaced cutting members may be radially displaced in the bore hole by a common actuating device during operation. The actuating device includes an ... | 02/03/1987 |
| 4635737 | Undercutting drill This disclosure relates to a drill for forming an undercut cavity in a hole in concrete, for an anchor bolt. The drill has forward and rearward ends, and comprises a body having an axially extending bore forming a generally cylindrical wall, the bore bein... | 01/13/1987 |
| 4550788 | Roof bolt hole groover A hole groover comprising a pair of grooving bits radially protruding from the surface of a drill rod and connected to swivel upwardly and downwardly near the end of the drill rod where the drill bit is connected. A connecting rod is connected to the insi... | 11/05/1985 |
| 4458761 | Underreamer with adjustable arm extension An underreamer having an adjustable arm extension includes a cam for urging the arm outwardly in an opened position, and a stop pin which engages a slot in the arm for limiting the maximum arm extension. An insert for the arm has a surface which overlaps ... | 07/10/1984 |
| 4446934 | Boring tool for radial enlargement of a cylindrical foundation bore A boring tool for radial widening or enlargement of a cylindrical bottom, foundation, or anchor bore. The boring tool comprises a tubular tool body having a tool shank provided for clamping in a driving machine or prime mover, and an enlarging spindle gui... | 05/08/1984 |
| 4444279 | Drilling tool A drilling tool adapted to produce a radial enlargement along a cylindrical elementary drilled hole in concrete masonry. The tool comprises at least one cutter which is mounted in a slot in a drill sleeve which enters the elementary drilled hole, this cut... | 04/24/1984 |
| 4354559 | Enlarged borehole drilling method and apparatus A method and apparatus are disclosed for drilling a bore hole using a dual concentric drill pipe. Air is supplied through the outer pipe to the bit to cool the bit and jet cuttings upwardly in the bore hole to a suction inlet leading from the bore hole to... | 10/19/1982 |
| 4354560 | Apparatus for drilling enlarged boreholes A rotary bore hole enlarging bit is connected to a rotary pipe string having a drilling fluid flow path and an actuator flow path. The bit comprises a body structure including inner and outer telescopic body sections, expansible and retractible arms carry... | 10/19/1982 |
| 4144942 | Method of setting a pile without noise or vibration and apparatus therefor This invention relates to a method of setting a pile without causing any noise or vibration. A hollow pile is erected along a leader fixed on the ground, a screw auger is inserted through the hollow center of the pile, the screw auger is hung on the leade... | 03/20/1979 |
| 4091882 | Drilling tool A drilling tool which comprises: a cylindrical structure having a spiral groove provided on the outer surface thereof and at least one elongated rectangular through-hole provided in the lower portion thereof; a tip which is loosely fitted into said throug... | 05/30/1978 |
