| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 175385000 | Bit with leading portion (e.g., pilot) forming smaller diameter initial bore | 18 |
| 20080223620 | DRILLING MACHINE STRUCTURE - A drilling machine structure is disclosed, characterized in which handles are arranged on the machine body for holding by the operator with both hands. Between the two handles there are assembled a power motor and a plurality of gear plates with different number of teeth to drive respectively center tip and spiral-shaped rotary blade at the lower part of machine body. The center tip and rotary blade are made of different materials in view of the drilling needs. As such, when drilling a hole, the drilling machine drills with the center tip in alignment with the hole center to guide the varying-speed cutters peripherally arranged at the very bottom of rotary blade to perform real rotary cutting and drilling, and the chips from the cutting are instantly and continuously brought to the surface through a lead hole disposed above each cutter under the driving of rotary blade, thereby achieving smooth drilling in different occasions. | 09-18-2008 |
| 20090120692 | LAYERED HARDFACING, DURABLE HARDFACING FOR DRILL BITS - A drill bit having a bit body having at least one blade thereon, at least one cutter pocket disposed on the at least one blade, at least one cutter disposed in the at least one cutter pocket, hardfacing applied to at least a selected portion of the drill bit is shown and described. The hardfacing includes a first hardfacing layer disposed on the selected portion of the drill bit, a second hardfacing layer disposed on the first hardfacing layer, wherein the first hardfacing layer has a hardness different than a hardness of the second hardfacing layer. | 05-14-2009 |
| 20100032216 | EARTH BORING CUTTER EMPLOYING HELICAL TEETH - An earth bit includes an earth bit body and a lug and cutting cone carried by the earth bit body, wherein the cutting cone is rotatably mounted to the lug. A plurality of cutters are carried by the earth bit body, wherein the cutters include a cutter body and a plurality of curved teeth extending between opposed ends of the cutter body. The curved teeth are positioned so that one end of a tooth overlaps an opposed end of an adjacent tooth. The curved teeth of a first cutter extend in a direction around its corresponding cutter body and the curved teeth of a second cutter extend in an opposed direction around its corresponding cutter body. | 02-11-2010 |
| 20100089659 | Drilling Tool - A bi-center drilling tool comprises a main reamer region located eccentrically to an axis of rotation of the tool, and a leading cutting structure located ahead of the main reamer region, in the drilling direction, the leading cutting structure being located so as to apply a side loading to the drilling tool, the direction in which the side loading acts being such as to counter a side loading applied, in use, due to the main reamer region being eccentric to the axis of rotation. | 04-15-2010 |
| 20100108396 | Drilling Tool - A drilling tool has a body with a main drilling region and a pilot drilling region, eccentric to the main drilling region. The main drilling region has main blades and the pilot drilling region has pilot blades. The main drilling region has a main pass-through diameter, centered upon a first axis, one of the main blades extending to the main pass-through diameter, the pilot region having a pilot gauge diameter, centred upon a second axis of rotation at least one of the pilot blades extending to the pilot gauge diameter, wherein part of a circle of diameter equal to the pilot gauge diameter and centred upon the second axis of rotation extends outside of a circle of diameter equal to the main pass-through diameter and centred upon the first axis. | 05-06-2010 |
| 20100116556 | PILOT REAMER WITH COMPOSITE FRAMEWORK - A reamer for subterranean wellbores may include a composite framework, which may include one or more high strength stems, each having one or more reamer bodies coupled thereto. The body may include a plurality of plates coupled together and may include additional components formed integrally therewith or coupled thereto. A method of forming a reaming tool may include forming a high strength stem and a reamer body and coupling the body to the stem. A method of using the reaming tool may include coupling one or more bodies in a drill string and reaming a wellbore. | 05-13-2010 |
| 20100181115 | DRILLING APPARATUS - Drilling apparatus comprises: a body; a pilot hole-drilling assembly ( | 07-22-2010 |
| 20110005841 | BACKUP CUTTING ELEMENTS ON NON-CONCENTRIC REAMING TOOLS - An apparatus for reaming or enlarging a borehole comprising a bi-center drill bit having backup cutters thereon. | 01-13-2011 |
| 20140144710 | Drill Assembly - Drill assembly for making a hole into a soil or rock which arrangement comprises a pilot bit ( | 05-29-2014 |
| 20150345228 | Drill Bit - A drill bit comprises at least one blade, comprising a plurality of cutting elements in the form of polycrystalline diamond cutters disposed on a leading edge of the blade, at least one diamond impregnated cutting region, disposed behind the leading edge of the blade, and wherein at least one of the cutters disposed on the leading, edge is an off-tip cutting element, arranged so that it does not engage with the formation during drilling until bit wear has taken place. | 12-03-2015 |
| 20180023349 | DOWN-THE-HOLE DRILLING DEVICE | 01-25-2018 |
| 175387000 | Leading portion is core forming type | 1 |
| 20130087390 | REAMING SHELL FOR MINING - A reaming shell for mining is provided. The reaming shell has a shank, and a plurality of pads attached at circumferential intervals from each other to extend lengthwise on an outer periphery of the shank. The reaming shell is coupled to a core bit of a diamond drilling tool for mining. The reaming shell includes a water groove of a recessed shape formed respectively between each adjacent pair of the pads, and extending from a leading edge along a length of the shank. | 04-11-2013 |
| 175388000 | Leading portion is a screw | 2 |
| 20130213717 | STEPPED DRILL BIT ASSEMBLY - A wet drill bit assembly and a dry drill bit assembly for cutting a borehole in the earth strata of a mine wherein the borehole has a reduced dimension interior region and an enlarged dimension exterior region. The wet drill bit assembly includes an axial forward spade-style cutting member, which has a spade hard cutting member with a first transverse cutting dimension, and an axially spaced apart axial rearward reamer cutting member, which has a hard insert with a second transverse cutting dimension, which is greater than the first transverse cutting dimension. The dry drill bit assembly includes an axial forward cutting member, which has an axial forward hard cutting insert with a first transverse cutting dimension, and an axially spaced apart axial rearward hard cutting insert that has a second transverse cutting dimension which is greater than the first transverse cutting dimension. An elongate sleeve is adapted to receive cutting debris from the operation of the axial forward hard cutting insert. | 08-22-2013 |
| 20140216825 | AUGER BIT WITH REPLACEABLE CUTTING BIT - An auger bit includes an elongated shaft, a cutting bit, a feed screw, and a locking fastener. The shaft includes a flute extending in a helical manner with respect to a longitudinal axis along at least a portion of the shaft. The shaft further includes a first slot and a second slot. The first slot extends parallel to the longitudinal axis proximate the first end and is aligned with the axis. The cutting bit is removably received in the second slot and includes a first edge. The feed screw includes a shank and a threaded portion. The shank is removably received in the first slot. The feed screw engages the cutting bit to secure the cutting bit relative to the shaft. The locking fastener is coupled to the shaft and engages the shank of the feed screw to secure the feed screw relative to the shaft. | 08-07-2014 |
| 175389000 | Impact type | 2 |
| 20100200303 | BIT ASSEMBLY - A bit assembly in a drilling apparatus working by hammering and for rotating said assembly comprising of a pilot bit ( | 08-12-2010 |
| 20110247882 | Exhaust Port in a Protruding Element of a Downhole Drill Bit - In one aspect of the present invention, a drill bit comprises an axis of rotation and a drill bit body that comprises a central bore and a working face, the working face comprising a plurality of fixed element cutting elements, a jack element extending from the working face and being coaxial with the axis of rotation, the jack element comprising a proximal end in mechanical communication with an oscillating hammer mechanism, the jack element also comprising a channel in fluid communication with the central bore, the channel directing a fluid flow into a formation, wherein a fluid volume defined by the hammer mechanism and the central bore is evacuated through the channel. | 10-13-2011 |
| 175391000 | Plural larger diameter steps | 2 |
| 20090145667 | ACTIVE STABILIZATION DURING CUTTING FOR HOLE OPENING TOOLS - A drilling tool for drilling a wellbore that includes at least a reaming section and a pilot conditioning section. The pilot conditioning section then includes at least one pilot conditioning blade having at least one cutting element formed of an impregnated matrix material. An outermost extent of the at least one cutting element from a central axis of the tool body is at least half of a pilot hole diameter. | 06-11-2009 |
| 20130319773 | FLUID DRILLING HEAD NOZZLE DESIGN - A fluid cutting head of the type having a plurality of nozzles in a rotatable nozzle assembly for cutting a bore hole in rock. The cutting head has nozzles arranged to be supplied with high pressure drilling fluid, forming jets positioned to cut adjacent rock. The nozzles include one or more generally axially facing pilot nozzles, and one or more generally radially facing reaming nozzles. At least the pilot nozzles include a non-tapering outlet section such that the jet issuing therefrom is of substantially constant cross-section in a zone immediately adjacent the outlet section. The pilot nozzles are located in a leading part of the rotatable nozzle assembly, and have a minimized diameter. The reaming nozzles are located in the following part of the rotatable nozzle assembly. The following part of the rotatable nozzle assembly is formed in a step-wise fashion to keep the reaming nozzles close to the rock face. | 12-05-2013 |
