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| Number | Title | Issue Date |
| 8387725 | Percussion drilling assembly and hammer bit with gage and outer row reinforcement A hammer bit for drilling a borehole in earthen formations comprises a bit body having a bit axis and a bit face. The bit face includes an inner region extending from the bit axis to about 50% of the bit radius and an outer region extending from the inner region to ... | 03/05/2013 |
| 8286736 | Drill bit, a drill rod and a self drilling roof bolt A drill bit for attachment to an elongate drill rod, the drill bit including means for attachment to an end of the drill rod, and a leading end which defines a pair of diametrically opposed slots which open axially for receipt of a portion of a drill tip which proje... | 10/16/2012 |
| 7900721 | Hard metal plate for rock drill and rock drill In a hard metal plate for insertion in to a seat formed at one end of a drill shaft of a rock drill, comprising a substantially rectangular base shape having two opposed long sides extending in the axial direction of the drill shaft which are at least partially cove... | 03/08/2011 |
| 7740089 | Drilling tool with a cutting element that is configured as a plate or head The invention relates to a drilling tool, especially for percussion drilling, which comprises a cutting element (3) that is configured as a plate (3) or head and that has at least one cutting edge (11) defined by a cutting face (6) and a ... | 06/22/2010 |
| 7559382 | Hard material head and rotary percussion drill bit A hard material head (1) for a rotary percussion drill bit (2) having an elongated shaft (15) including at least three cutting edges (4) distributed circumferentially within a circumscribing circle, a bottom surface (6) located opp... | 07/14/2009 |
| 7510032 | Hard composite cutting insert and method of making the same A hard composite cutting insert useful for cutting strata such as earth or rock that includes a body that is tough. The body contains a member that is harder than the body (i.e., has a harder region). The combination of the tough body with the harder member (or regi... | 03/31/2009 |
| 7434635 | Tin seat for rock drill insert A rock drilling bit includes at least one button having a button sidewall and button bottom, the button sidewall and the button bottom having a button sidewall geometry and a button bottom geometry, respectively. The rock drilling bit further comprises a bit body ha... | 10/14/2008 |
| 7341433 | Cutting insert and tool and wrench for using the same A cutting insert includes a plurality of consecutively disposed, interlinked individual cutting inserts that can be brought into use successively through a respectively interposed predetermined breaking point by detaching a respectively preceding individual cutting ... | 03/11/2008 |
| 7326009 | Edge-carrying drill body having an internal chip-removal channel An edge-carrying drill body intended for deep hole drilling, is rotatable around a central geometric axis and comprises a through-channel arranged for internal chip evacuation. The channel mouths in front and rear ends of the drill body. A front channel mouth is bri... | 02/05/2008 |
| 7320505 | Attack tool In one aspect of the invention, an attack tool is disclosed which comprises a wear-resistant base suitable for attachment to a driving mechanism. The wear-resistant base has a shank and a metal segment. A cemented metal carbide segment is bonded to the metal segment... | 01/22/2008 |
| 7320565 | Edge-carrying drill, method for the manufacture of the drill, and drilling tool comprising such a drill In a first aspect, the invention relates to an edge-carrying drill body (1) of the type that is intended for deep hole drilling, and which is rotatable around a geometric axis (C) as well as comprises a through channel (2) arranged for internal chip ev... | 01/22/2008 |
| 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 |
| 7258180 | Rotary hammerdrill bit A rotary hammerdrill bit for use with a percussion drilling device or a hammer drilling device, with a shank and a drill head attached to or configured on the shank, wherein a front side pointing in the advance direction of the drill head has a main cutting plate fo... | 08/21/2007 |
| 7240746 | Bit gage hardfacing An earth boring bit has at least one rotatable cone with a gage surface that engages a sidewall of a wellbore as the bit rotates. The gage surface has hardfacing bars spaced circumferentially apart from each other. A first group of the hardfacing bars extends from t... | 07/10/2007 |
| 7229236 | Helical cutting insert with progressive cutting edge An indexable, helical cutting insert includes at least one axial clearance slash extending from a bottom surface to one of said side walls forming a wiper on an edge of the axial clearance slash. In another embodiment, the cutting insert includes at least one inside... | 06/12/2007 |
| 7225890 | Cutting plate for a drill bit An auxiliary cutting plate (10) for a multi-cutting plate drill bit (2) has a body (44) for fixing into a slot in the drill bit (2) and a profiled tip (46). The body (44) has a central longitudinal axis and the profiled tip ... | 06/05/2007 |
| 7182556 | Drill and throwaway insert A drill improving the aligning accuracy of an insert and achieves a stable machining operation while maintaining the strength of the drill main body. The drill includes a drill main body rotatable about an axis, and a throwaway insert detachably attached to the dril... | 02/27/2007 |
| 7168893 | Throw-away tipped drill, throw-away tip, and drill main body In a throw-away tipped drill, a slit is formed at the bottom surface of a tip attachment seat which faces towards the end of its axial line direction, with this slit extending towards the rear of the axial line direction. Furthermore, when seen from the end of the a... | 01/30/2007 |
| 7168511 | Rotary drill bit having cutting insert with a notch A rotary drill bit insert that includes an elongate body that is rotatable about a central axis wherein the elongate body has a pair of symmetrical halves symmetrical about the central axis. The elongate body contains a central notch disposed between the symmetric h... | 01/30/2007 |
| 7147414 | Spur point drill insert A cutting tool insert having a specialized spur point geometry at the center of the insert. The insert comprises a spur point cutting portion and a blade cutting portion wherein the spur point provides stability by providing a spot and allowing a flexible workpiece ... | 12/12/2006 |
| 7137461 | Masonry drilling tool A masonry or rock drilling tool suitable for use with a rotary hammer has a drilling head (4, 104) at a forward end of the tool. A forwardly extending cutting plate (6, 106) is fitted or formed on the drilling head (4, 104). First and second opp... | 11/21/2006 |
| 7128773 | Compositions having enhanced wear resistance A composite material includes a double cemented carbide and a coarse grain dopant, wherein the coarse grain is added in an amount sufficient to improve wear resistance of virgin double cemented carbide. The double cemented carbide may selected from the group of carb... | 10/31/2006 |
| 7121770 | Tool body and cutting insert for metal cutting operations A cutting tool body that is adapted for use in milling operations comprises at least one pocket for supporting a cutting insert. The pocket is defined, at least in part, by a cylindrical wall and a seating surface within the tool body. At least one passage is provid... | 10/17/2006 |
| 7108064 | Milling tool insert and method of use The present invention generally relates to a cutting insert for use with wellbore milling tools. The cutting insert forms an angle between a milling surface of the insert and a surface of the tool that the insert is attached to in order to provide the proper cutting... | 09/19/2006 |
| 7104344 | Percussion drilling head Device and method for drilling into geological formations. The device comprises: a rotatable body; drilling cutters arranged on an axial end surface of the rotatable body; a percussion part, which ... | 09/12/2006 |
| 7100714 | Mine ceiling drill bit and blade A drill bit consists of a bit body having a forward end and a slot in the forward end to hold a hardened cutting blade. The bit body has a table near the center of the blade to reduce the speed at which the drill bores into hard material. The blade has a central slo... | 09/05/2006 |
| 7100711 | Single cone rock bit having inserts adapted to maintain hole gage during drilling A roller cone drill bit is disclosed which includes a bit body adapted to be coupled to a drill string. A bearing journal depends from the bit body. A single roller cone is rotatably attached to the bearing journal. The roller cone has a plurality of inserts dispose... | 09/05/2006 |
| 7097396 | Drill bit An object of the present invention is to provide a drill bit which is simple in design, high in rigidity, and superior in durability and whose drilling function is in no way inferior to that of conventional drilling bits. To this end, in a drill bit comprising a cut... | 08/29/2006 |
| 7090444 | Helical cutting insert with axial clearance slash An indexable, helical cutting insert includes at least one axial clearance slash extending from a bottom surface to one of said side walls forming a wiper on an edge of the axial clearance slash. In another embodiment, the cutting insert includes at least one inside... | 08/15/2006 |
| 7086489 | Multi-lobed cutter element for drill bit Disclosed are cutter elements for a drill bits having particular, but not exclusive, application on the nose portion of the cone cutters of a rolling cone bit. The cutter elements include a base, a cutting portion, and a plurality of cutting lobes extending radially... | 08/08/2006 |
| 7070011 | Steel body rotary drill bits including support elements affixed to the bit body at least partially defining cutter pocket recesses A steel body rotary drag bit for drilling a subterranean formation includes a plurality of support elements affixed to the bit body, each forming at least a portion of a cutting element pocket. Each of a plurality of cutting elements has a substantially cylindrical ... | 07/04/2006 |
| 7066694 | Cutting plate for a drill bit A cutting plate (4) has a working end (20) to engage a workpiece and an axis (8) of rotation. A pair of oppositely arranged first faces (34) are inclined axially rearward from the working end (20) in an axial plane intersecting sai... | 06/27/2006 |
| 7051822 | Drill bit and drill tip having a tip-locating structure A drill bit assembly includes a drill bit having a leading end to which a drill tip is bonded. The drill tip has a front cutting edge, a pair of side cutting edges, a rear end and a pair of parallel side walls extending between the respective edges. The leading end ... | 05/30/2006 |
| 7013999 | Wedge tooth cutter element for drill bit A cutter element for a rolling cone bit includes a cutting surface having front and back surfaces, a pair of flanking surfaces that intersect in a rounded nose that is offset from the central axis of the cutter element's base. At least one flanking surface includes ... | 03/21/2006 |
| 7001120 | Drilling tool The invention relates to a drilling tool (36), in particular for working concrete, rock, masonry and suchlike materials, having a single- or multi-edge tool head with at least one cutting body (1) which comprises a central region (12) which is d... | 02/21/2006 |
| 6976549 | Drilling tool The invention relates to a drilling tool (1), in particular for working concrete, rock, masonry and suchlike materials, having a tool head with cutting body (5) which has at least one front rake face (9, 10), at least one rear flank ([lacuna] | 12/20/2005 |
| 6968912 | Drill blades for drill bit A drill bit consists of a bit body having a forward end and a slot in the forward end to hold a hardened cutting blade. The blade has a central slot extending into the forward end thereof such that the slot defines inner side wails and a bridge extending between the... | 11/29/2005 |
| 6945340 | Roof bit and insert assembly A center vacuum rotary drill bit including a rotary drill bit body and an insert. The bottom surface of the slot has a projecting key that cooperates with a depression keyway of the insert. Generally vertical sidewall surfaces of a depression keyway and vertical sur... | 09/20/2005 |
| 6929079 | Drill bit cutter element having multiple cusps Cutter elements for use in rolling cones rock bits are disclosed having a crown that includes multiple, spaced-apart cusps for enhancing formation removal by creating overlapping Hertzian contact zones. The cusps may be partially dome-shaped, berm shaped or otherwis... | 08/16/2005 |
| 6926104 | Drill crown A drill crown (1) used for drilling purposes, especially for rotary percussion drilling of a mouth of a blast furnace. The drill crown (1) consists of a drilling head (4) provided with a plurality of hard material or hard metal inserts (6... | 08/09/2005 |
