Class 175/389 - Impact type

Subclass of Class 175 - Boring or penetrating the earth
Definition: Apparatus in which the cutting edges of the bit are of the
No. of patents: 30
Last issue date: 09/06/2011

Number	Title	Issue Date
8011457	Downhole hammer assembly A drill bit assembly comprises a bit body intermediate a shank and a working face. The shank is adapted for connection to a drill string. The drill string comprising a fluid passage at least partially disposed within the body. A hammer assembly is movably disposed w...	09/06/2011
7938205	Boring head method and boring head for a ground boring device The invention relates to a boring head for a ground-boring device displacing earth with a percussive action, comprising at least three boring head sections, of which the first section has a form optimized for the loosening and for guiding the device, the second sect...	05/10/2011
7775303	Device for a drilling tool An apparatus for a drilling tool includes a pilot drilling bit, a reamer, and a pilot body which is disposed to support the reamer and the pilot drilling bit at the end of a casing tube. The reamer includes a closed position in which the parts of the tool are concen...	08/17/2010
7730975	Drill bit porting system In one aspect of the present invention a drill bit has a jack element with a distal end extending beyond a working face. A porting mechanism within the bore comprises first and second discs contacting along a flat interface. The first disc is attached to a turbine w...	06/08/2010
7641003	Downhole hammer assembly A drill bit assembly comprises a bit body intermediate a shank and a working face. The shank is adapted for connection to a drill string. The drill string comprising a fluid passage at least partially disposed within the body. A hammer assembly is movably disposed w...	01/05/2010
7624824	Downhole hammer assembly A drill bit assembly comprises a bit body intermediate a shank and a working face. The shank is adapted for connection to a drill string. The drill string comprising a fluid passage at least partially disposed within the body. A hammer assembly is movably disposed w...	12/01/2009
7325633	Rock drill bit and a thread joint therefor A drill bit intended for percussive rock drilling is formed to reduce the occurrence of cavitation during percussive drilling. The drill bit includes an integral skirt and at least one channel for transport of flush medium, such as water. The drill bit has a front f...	02/05/2008
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
7228922	Drill bit A drill bit has a pair of cutting teeth with cutting elements extending from a cutting end portion of the drill bit. Each cutting tooth extends radially, outwardly parallel to a longitudinal axis of the drill steel. The cutting teeth are juxtaposed with one another ...	06/12/2007
6905278	Connection point A connection point (1) between two tool parts is proposed which are joined by means of a threaded spindle (7) oriented in longitudinal direction of the tool parts. The threaded spindle has two oppositely threaded sections (13, 15) which interact...	06/14/2005
6641332	Foundation support and process for structures An elongated pilot member is forced into the ground and an auger with a hollow stem is positioned around the pilot member and rotated to move the auger into the ground. A second elongated member is coupled to the pilot member and an upward force is applie...	11/04/2003
6640914	Percussion borer for forming bores in stone material A percussion bores for forming borer in a stone material and including a chisel stem (2) having a prismatic cross-section and provided with a chiseling head (3) and at least one radial opening (4), a twist drill (6) extending through the cylindrical throu...	11/04/2003
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
6328506	Masonry drill bit A masonry drill bit 1 having an active diameter of D, comprising a shaft 3 and a tip 5 for engaging a workpiece, the tip 5 including a central portion 11 extending ahead of an outer portion 13, wherein the central portion 11 has a width of at least 0.25D ...	12/11/2001
6241033	Drill string apparatus and method of extending the length of a drill string A percussive drilling mechanism includes a percussive hammer and a drill string connected to the hammer. The drill string includes a plurality of identically shaped shank rods interconnected to one another. To extend the drill string, a trailing one of th...	06/05/2001
6213230	Drilling tool especially for the rotary percussion drilling of preferably rock A drilling tool, especially for the rotary percussion drilling of preferably rock, has a drilling body equipped toward the drilling side preferably with cutting bits, and with an axially arranged bore for receiving an exchangeable centering drill. In orde...	04/10/2001
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
6202768	Rock drilling tool and reamer for percussive drilling A rock drilling tool includes a pilot bit screw threaded into a front end of a drill rod. A reamer is mounted on the outside of the pilot bit. The reamer includes a central opening having a front portion and a rear portion. The front portion is connected ...	03/20/2001
6102634	Masonry drill bit A masonry drill bit 1 having an active diameter of D, comprising a shaft 3 and a tip 5 for engaging a workpiece, the tip 5 including a central portion 11 extending ahead of an outer portion 13, wherein the central portion 11 has a width of at least 0.25 D...	08/15/2000
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
5779403	Percussive blow assisted rotary drill A percussive blow assisted rotary drill includes an axially extending shank (1) with a leading end face (3) and an axially extending outside surface (2) containing a helically extending drilled material removal groove (4, 5). At least one hard metal cutti...	07/14/1998
5052503	Eccentric drilling tool An eccentric drilling tool comprises a guide member (10) rotatably centered by the mouth of a casing tube (11) that follows the tool downhole during drilling. A pilot bit (23) on the guide member (10) is provided with axially oriented hard metal pilot but...	10/01/1991
4852672	Drill apparatus having a primary drill and a pilot drill Drill steel or bit apparatus includes a primary drill bit having a base and a stem, a drill tip, and a bore extending longitudinally through the base, the stem, and the tip, and a pilot drill bit having a base and a stem, and a tip, and the stem and the t...	08/01/1989
4549615	Single-pass notching and drilling tool and method of drilling a blast role therewith Disclosed is a single-pass notching and drilling tool. The tool comprises an adaptor having a first threaded end for coupling with a power source, an opposed second threaded end, an enlarged diameter portion adjacent to the first threaded end and having a...	10/29/1985
4440244	Drill tool A drill tool for rotary and/or percussion drilling with drill rod means (14) within casing tube means (15) comprises a centric cutting bit (11) and an eccentric reamer cutter (12), both provided with hard metal inserts. For purposes of obtaining a life of...	04/03/1984
4361197	Blast hole grooving bit and wear resistant compact A blast hole drill bit is disclosed for forming longitudinally extending grooves in already drilled blast holes, having a body with a forward face and a rearwardly extending pilot diameter. One or more radially extending wings are located at the rearmost ...	11/30/1982
4354561	Reciprocating drill bit A reciprocating rotary drill bit is disclosed to include a coupling member for coupling the drill bit to a source of drill bit drive power and a cutter member for drilling into a workpiece. The coupling member and the cutter member are slidably associated...	10/19/1982
4294319	Cutter head for rotary percussion drills A replaceable cutter head for rotary percussion drills having a pilot cutter on the end of a drill stem with a main cutter head surrounding the pilot cutter, the main cutter head having hammering/chipping cutters and milling cutters arranged along radial ...	10/13/1981
3955631	Soil sampler The present sampler is adapted to take soil samples from the ground surface, from a borehole sunk by other tools, as well as for drilling shallow boreholes. The sampler is provided with an air-operated percussion mechanism and a soil sample receiving slee...	05/11/1976
3952819	Fatigue resistant anvil bit for percussion rock drill A fatigue resistant anvil bit is described for use on a percussion rock drill. The anvil bit has a shank having a substantially uniform cross section terminated in a threaded end portion. A bit head is threadably mounted on the end portion having a diamet...	04/27/1976

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Class 175/389 - Impact type