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| Number | Title | Issue Date |
| 7281594 | Rock drill bit The present invention relates to a rock drill bit for percussive drilling. The drill bit comprises a bit body, a head portion defining a longitudinal center axis. The head portion includes an axially forward rock-crushing surface and a skirt that extends axially rea... | 10/16/2007 |
| 7255182 | Ground drilling tool A back bit (20) is disclosed which is to used in conjunction with drilling equipment (10) which may include a derrick (11), a drilling pipe (12), a back head (14), a starting rod (13), and a cutting bit (15) mounted t... | 08/14/2007 |
| 7025156 | Rotary drill bit for casting milling and formation drilling A rotary drill bit is used both for milling a casing window and drilling a lateral borehole into subterranean earthen materials, without the prior need of having separate drill bits for milling of the casing and for drilling of the borehole. The rotary drill bit is ... | 04/11/2006 |
| 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 |
| 6926100 | Hole reaming apparatus and method An enhanced reaming apparatus and method are disclosed. A reaming assembly may have a motor and a pump that provide linear force, torsional force, and pressurized drilling fluid to a reamer to cause the reamer to enlarge the bore of a pilot hole. The reamer may have... | 08/09/2005 |
| 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 |
| 6908264 | Quick change drill bit A quick-change core drill includes an adapter and a generally tubular drill barrel. The adapter comprises a first end adapted to be removably connected to a drill spindle and a second end adapted to be removably connected to the drill barrel. The drill barrel includ... | 06/21/2005 |
| 6843334 | Drilling head of a rock drill A drilling head of a rock drill for use with a hand-held power tool is formed completely of a hard material and includes a main bit (2) and at least one auxiliary bit (3a, 3b). The at least one auxiliary bit (3a, 3... | 01/18/2005 |
| 6634444 | Drill bit for trenchless drilling A drill bit for trenchless drilling includes a bit body defining a longitudinal axis about which the drill bit is rotated during a trenchless drilling operation. Two sets of cutting teeth are mounted at a front end of the bit body, the sets disposed on op... | 10/21/2003 |
| 6494275 | Rock drill bit having retrac teeth and method for its manufacturing A rock drill bit for percussive drilling, especially top hammer drilling, includes a bit head provided with front rock crushing buttons and a skirt. The bit head is provided with a number of grooves formed in the outside of the skirt and extending in the ... | 12/17/2002 |
| 6321862 | Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability A rotary drag bit suitable for directional drilling. The bit includes a bit body from which extend radially-oriented blades carrying PDC cutters. The blades extend to primary gage pads, above which secondary gage pads are either longitudinally spaced or r... | 11/27/2001 |
| 6213231 | Boring tool with rectangular plates A boring tool is provided with first and second rectangular reversing cut plates which have, in each case, two short and two considerably longer cutting edges. One of the reversing cut plates is arranged connecting to or intersecting the axis of rotation ... | 04/10/2001 |
| 6116357 | Rock drill bit with back-reaming protection A drill bit for boring a bore hole in an earthen formation comprises: a bit body having a pin end, a cutting end and a longitudinal bit axis and including at least two legs extending from the cutting end, each of the legs including a bearing that rotatabl... | 09/12/2000 |
| 5868212 | Stabiliser tool A stabilizer tool (15) for a drill string (10) has a circular body (16) with recesses (17) containing projecting pad assemblies (18) arranged in a spaced helical configuration, each pad assembly (18) having at least one projecting wear block (20) maintain... | 02/09/1999 |
| 5810102 | Reversible bit assembly A reversible bit assembly (8) that includes a reversible bit (10) having a shank (20) and a radially enlarged center portion (22) located midway along the longitude of the shank (20). Opposed cutting tips (24) are located at opposed shank ends (23). The b... | 09/22/1998 |
| 5743345 | Drill bit for reverse drilling A drill bit for reverse drilling in a drill hole being produced by a percussive, fluid-actuated drill includes an elongated drill bit body having a bore extending there through for transmission of a fluid, the body terminating in a head end portion and a ... | 04/28/1998 |
| 5655612 | Earth-boring bit with shear cutting gage An earth-boring bit is provided with hard gage inserts that protrude from the gage surface of the cutter to engage the side of the borehole for holding gage. The cutting end of the gage insert has a cutting end defining at least one sharp cutting edge and... | 08/12/1997 |
| 5467836 | Fixed cutter bit with shear cutting gage An earth-boring bit of the fixed cutter variety is provided with hard gage inserts that protrude from the gage surface of the cutter to engage the side of the borehole for holding gage. The gage insert has a substantially flat, polygonal face defining at ... | 11/21/1995 |
| 5415243 | Rock bit borhole back reaming method A method to back ream a borehole drilled with a roller cone drill bit is taught. Protruding hard metal cutting inserts are affixed on the upper outside diameter tapered shoulder of each of the bit legs. If the borehole closes to a smaller diameter than th... | 05/16/1995 |
| 4986375 | Device for facilitating drill bit retrieval A device for facilitating the retrieval of a drill bit from a crooked hole, a soft rock or a broken rock formation is disclosed. The device is secured to a drill string at one end and to a drill bit an an opposite end. The device includes a cylindrical me... | 01/22/1991 |
| 4953642 | Rock drill bit A rock drill bit having an elongated tubular body with a drilling head portion at one end and a trailing opposite end portion, the head end portion having attached hardened portions for engaging and drilling a work surface, at least one opening through th... | 09/04/1990 |
| 4262762 | Anti-collaring structure for impact bit Rib structure for an impact type rock drilling bit, spirally oriented on the external surface of the bit to move particulate matter forwardly relative to the bit when it be turned in its normal drilling direction, to aid the process of extraction of the b... | 04/21/1981 |
