Cleansing Fluid Passage Through Hammer Head Patents (Class 173/78)
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Patent number: 5038874Abstract: A drill string for top hammer drilling includes a drill bit, a set of central rod members for transferring impact energy to the drill bit, and a set of tubular members surrounding the rod members for transferring rotation to the drill bit. The rod members define a first internal channel for conducting flushing medium. The drill bit defines a second internal channel which extends rearwardly and penetrates a rear end of the drill bit to communicate with the first channel. The drill bit further includes a transverse channel disposed in an intermediate section of the drill bit and which is connected to the second channel. The transverse channel penetrates an envelope surface of the drill bit for conducting flushing medium out of the drill bit and into an enlarged space defined between the drill bit and the tubular member.Type: GrantFiled: February 5, 1990Date of Patent: August 13, 1991Assignee: Sandvik ABInventors: Lars K. Larsson, Sven P. Liljebrand
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Patent number: 5014796Abstract: In a water driven down-the-hole rock drill, the rearward end of an associated hammer is provided with a drive piston reciprocable in a cylinder located adjacent the rear of the drill. The front end of the hammer is guided for reciprocation in a bearing located adjacent an anvil of a drill bit. Between the cylinder and the bearing the hammer is elongated and enlarged diametrically relative to the piston. The enlarged hammer portion reciprocates freely in a chamber formed by an outer casing of the drill. Drive water is expelled from the cylinder and flushes the hole drilled by the bit. An open ended tubular valve reciprocates to control a duct connecting the interior of the valve to coaxial through-flushing channels in the hammer and the drill bit.Type: GrantFiled: January 8, 1990Date of Patent: May 14, 1991Inventor: Per Gustafsson
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Patent number: 4958691Abstract: A downhole oil well tool uses impact, reciprocal drilling and an improved rotating bit or like working member, receiving both fluid pressure and weight from an elongated pipe string with a flow bore in order to drive the tool. A valve within tool housing controls fluid pressure to the working end so that the tool pressures up, then releases pressure through the working member allowing the pipe string to load the bit, creating impact. A clutch rotates the working member during drilling to prevent imprint upon the formation.Type: GrantFiled: June 16, 1989Date of Patent: September 25, 1990Inventor: James Hipp
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Patent number: 4940097Abstract: A novel fluid powered rotary percussion drill is disclosed having a small, efficient, fluid energy to impulsive mechanical energy conversion motor and a unique bit arrangement wherein individual independently acting formation disintegration inserts are periodically actuated by the motor at a comparatively high cycle frequency to drill earthen boreholes. Bit drilling structure is renewable by replacing individual inserts and better borehole diameter and bit cutting ability is maintained by rotational gage row inserts. Bottom borehole sensing structure determines drill operational mode.Type: GrantFiled: December 13, 1988Date of Patent: July 10, 1990Inventor: Leo A. Martini
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Patent number: 4923018Abstract: A percussion drill comprises a drill bit and a reciprocable hammer piston for imparting blows to the bit. Pressurized air is supplied to the piston for reciprocating the piston. Some of the air is by-passed to an exhaust passage and is exhausted ahead of the bit for removing cuttings. An indexable choke valve is disposed in the exhaust passage for regulating the amount of air which is exhausted. The choke valve comprises a portion of a valve carrier which carries a check valve at its rear end. The valve carrier is rotatable to produce an indexing of the choke valve. The valve carrier is insertable in a front-to-rear direction into a central opening of a rear sub and is secured to the rear sub by a pin which also holds the choke valve in selected positions of adjustment.Type: GrantFiled: March 2, 1989Date of Patent: May 8, 1990Assignee: Sandvik Rock Tools, Inc.Inventor: James F. Meek
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Patent number: 4921056Abstract: A valveless-type down-the-hole hammer drill which has an inner tube extending from the upper end of the hammer body into a central opening in a cutter bit reciprocably mounted in a chuck on the opposite end of the hammer body. High pressure fluid is supplied to the interior of the inner tube and a piston surrounding the inner tube has internal surfaces controlling connection of a port to chambers above and below the piston. The external surface of the piston controls connection of these chambers to an exhaust port. A valve sleeve on the chuck coacts with the piston in this respect.Type: GrantFiled: April 6, 1988Date of Patent: May 1, 1990Inventor: Melvyn S. J. Ennis
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Patent number: 4921052Abstract: A downhole reverse circulation hammer is provided comprising a tubular housing and a top sub and drill bit supported mounted on either end of the housing. A central axis tube extends through the housing, top sub and drill bit support and a piston is slidably positioned in the tube. The hammer has a network of fluid passageways and spaces which enable the piston to reciprocate against an anvil in response to the entry and exit of a fluid into the spaces via the passageways.Type: GrantFiled: March 23, 1989Date of Patent: May 1, 1990Inventor: Ian G. Rear
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Patent number: 4878550Abstract: A down-hole percussion drilling tool supplied with compressed air includes a piston reciprocated in an enclosed cylinder against a bit. A spool is continuously reciprocated in a valve chamber by a pilot fluid pressure supply, tapped from the compressed air from a major air flow passage to either a first or a second feed passage. Compressed air conducted through the first feed passage accelerates the piston toward the bit and compressed air conducted through the second feed passage accelerates the piston away from the bit. The continuous reciprocation of the spool is independent of the position of the piston relative to the cylinder.Type: GrantFiled: July 15, 1988Date of Patent: November 7, 1989Assignee: Sandvik Rock Tools, Inc.Inventor: Jo-Yu Chuang
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Patent number: 4840238Abstract: In a scavenger is supplied through a scavenging pipe (26) to the internal pipe string (11), the scavenging pipe (25) extending through a bore (27) of the hammer piston (17) of the hammer drill. Due to a rotary drive (14), the drilling strings (10,11) are rotated which are connected to the shank (13) extending into the rotary drive (14). The scavenger is conducted through the scavenging pipe (26) into the shank (23) and from there into the internal pipe string (11). The external diameter of the scavenging pipe (26) is inferior to the inner diameter of the bore (27) of the hammer piston (17), and of the scavenging bore (23). Sealing between the scavenging pipe (26) and the scavenging bore (23) is effected by a thick head piece (33) at the end of the scavenging pipe. Said head piece (33) contains a seal rubbing along the cylindrical scavenging bore wall if the hammer piston (17) strikes on the shank (13).Type: GrantFiled: August 9, 1988Date of Patent: June 20, 1989Assignee: Ing. Gunter Klemm Spezialunternehmen fur BohrtechnikInventor: Gunter Klemm
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Patent number: 4790391Abstract: An air-pressure impact type drilling method and an apparatus for the same in which a piston of an air hammer drill is moved up and down by pressure air to produce impact energy and the impact energy of the piston is used to give impact vibrations repetitively to a drill bit. In the air-pressure impact type drilling method and the apparatus for the same, the air hammer drill is operated by the pressure air to be supplied from the ground, the air that has already been used for operation of the air hammer drill is exhausted onto the ground through an air exhaust pipe provided in a drilling pipe and communicating with an air exhaust passage formed in the air hammer drill, and substances cut out by the air hammer drill together with muddy water within the trench are discharged by means of a reverse circulation system while drilling on through the earth.Type: GrantFiled: September 24, 1986Date of Patent: December 13, 1988Assignee: Tone Boring Co., Ltd.Inventors: Hiroyuki Hamamura, Hiroyuki Kawasaki, Taro Watanabe
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Patent number: 4771835Abstract: A down hole hammer comprising a substantially cylindrical casing having a top sub at one end and a drill bit support at the other; a central passageway extending through the top sub, casing and drill bit support; a central tube coaxial with the casing and extending from the bottom of the top sub to the top of the bit support thereby defining an annular space between its outer surface and the internal face of the casing, its inner bore forming part of the central passageway; an annular piston reciprocatively accommodated within the annular space for movement between an impact position at which said piston abuts the drill bit support, and a raised position at which said piston is spaced from the drill bit support; fluid porting being provieded to said annular space to effect the reciprocation of the piston between the raised and impact positions, the exhaust from the annular space during reciprocation of the piston being exhausted into the central passageway; a fluid by-pass extending between the top sub and thType: GrantFiled: May 1, 1987Date of Patent: September 20, 1988Assignee: Wallis Drilling Pty. Ltd.Inventor: Ronald E. Eaton
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Patent number: 4736805Abstract: A tool for a hydraulic breaker having a pressurized fluid system which coacts with the impact tool to break objects such as rocks or aggregate sections. The impact tool has a bore extending through a work engaging end. A conduit is routed into the bore and includes a nozzle at its terminal end adjacent the work engaging end of the tool through which high pressure water is directed at the object to be broken. The tubing extends through the sidewall of the tool and into the bore through a radially extending slot. The tubing is mounted on the housing of the hydraulic hammer by means of an elastomeric vibration-dampening mounting block. The tubing is connected by high pressure hose to a valve and pump capable of developing fluid pressure in the range of about 20,000 psi. The slot is elongated to permit indexing of the tool relative to the hammer. The tool is retained in the hammer by means of a tool retainer or socket.Type: GrantFiled: July 21, 1986Date of Patent: April 12, 1988Assignee: NLB Corp.Inventors: Forrest A. Shook, Gerard J. DeSantis
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Patent number: 4722403Abstract: The annular air-hammer apparatus for drilling holes comprises a shell hav fitted co-axially therein a chips-receiving sleeve, a hollow cylindrical case, and a ring-shaped hammer capable of reciprocating back and forth. The lower part of the shell accommodates a rock-cutting tool capable of moving axially with at least one blow-off passage formed by at least a single longitudinal groove made on the outer cylindrical surface of the rock-cutting tool. With the rock-cutting tool in its uppermost position, the blow-off passage communicates with an outlet space provided between the shell and the case.Type: GrantFiled: August 5, 1986Date of Patent: February 2, 1988Assignee: Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SssrInventors: Alexandr D. Kostylev, Boris B. Danilov, Boris N. Smolyanitsky, Vladimir P. Boginsky, Jury N. Syryamin, David I. Kogan, Oleg V. Smirnov, Yacheslav N. Saveliev
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Patent number: 4694911Abstract: A percussion drilling tool assembly is provided which operates under fluid pressure to reciproce a hammer, the hammer is disposed in a barrel assembly and operates to strike an anvil bit shank to cause the bit to thereby penetrate a rock substrate material. A central fluid passage through the drill stem of the assembly and through the reciprocating hammer allows a flushing fluid to be used with the drilling assembly to flush cuttings from the hole up and around the drill stem simultaneously with and separate from the fluid operating system for reciprocating the hammer. The drill stem includes intake and exhaust passages for pressured working fluid as well as a mud passage for the flushing fluid or mud, the drill stem is made up in sections connected to form a string which extends the length of the hole and provide the pressured working fluid and mud to the pneumatic tool connected at the end of the drill stem.Type: GrantFiled: February 25, 1985Date of Patent: September 22, 1987Inventor: James D. Kennedy
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Patent number: 4676716Abstract: A hydraulic multistage turbine each stage of which comprises a stator and a rotor having rings with flow channels and hubs carrying the bladings. There are stages wherein the blades of the bladings are made with an angle of curvature of the camber line greater than an angle formed by the tangent to this line at the exit of the blading and the axis of drilling fluid flow. In a stage wherein the ring has such blades it is provided with by-pass channels arranged hydraulically parallel to the flow channel of the ring and communicating the space between this ring and an upstream ring with a space between this ring and a downstream ring for discharging part of the drilling fluid from the flow channel.Type: GrantFiled: November 4, 1985Date of Patent: June 30, 1987Assignee: Vsesojuzny Nauchno-Issle-Dovatelsky Institut Burovoi TekhnikiInventors: Sergei J. Brudny-Chelyadinov, Vigdor S. Budyansky, Viktor A. Filimonov
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Patent number: 4547928Abstract: A tool for removing solid deposited material from a surface to be cleaned, such as for cleaning material from the brake drums of motor vehicles and for removing the material, includes a member for loosening the deposited material and a connection to a vacuum source for removing the loosened material. The loosening member is a manually operable cutting head including an impact element located at one end of a tubular member. During use, the impact element performs a stroke-like movement. The other end of the tubular member forms a connection to the vacuum source.Type: GrantFiled: October 18, 1983Date of Patent: October 22, 1985Inventor: Horst Ludscheidt
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Patent number: 4544040Abstract: An anvil is formed on one end of an elongated piece and the piece is driven into the ground or the like by impacting the anvil with a reciprocable ram driven by a drive mechanism that is operated by a valve which is reciprocably mounted in a normally balanced two directional fluid pressure circuit to reciprocate in the alternate directions thereof when the circuit is unbalanced in the respective directions thereof. The circuit has a pair of outlets therein which are connected with the opposing ends of the valve and disposed to slidably engage with the ram during the stroke thereof. The ram comprises an anvil impacting body having a striking surface on one end thereof and a pair of grooves in one laterally oriented face thereof which are mutually offset longitudinally the the reciprocable axis of the body on spaced parallel lines to form collateral mutually longitudinally offset lands on the lines.Type: GrantFiled: June 29, 1984Date of Patent: October 1, 1985Assignee: Tigre Tierra, Inc.Inventor: Gerald T. Sweeney
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Patent number: 4527641Abstract: In a percussion tool for rock drilling there is used in place of the conventional, large bore crown a hammer body (18) carrying a great number of interchangeable small bore crowns (26a,26b). The impact of a hammer piston (22) is transferred to the hammer body (18) which contains a radially projecting thicker head (25) to which the bore crowns (26a,26b) are secured. If individual bore crowns are worn or damaged, they can be interchanged individually. Moreover, the bore crowns can be rotated so as to position corresponding other hard metal elements (33) into the marginal area of the percussion tool.Type: GrantFiled: May 1, 1984Date of Patent: July 9, 1985Assignee: Hydroc Gesteinsbohrtechnik GmbHInventor: Gunter Klemm
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Patent number: 4494613Abstract: A method and apparatus for driving a hollow pile into the ground. By using a hollow rod having a short auger fixedly secured to a leading end portion thereof, excavated earth and sand are lifted to and around the upper portion of the auger where compressed air is spouted from nozzle orifices formed in the hollow rod thereby lifting the excavated earth and sand through the hollow pile and consequently discharging the same from the hollow pile. As earth and sand are discharged from the hollow pile, the pile is sunk or driven into the ground.Type: GrantFiled: March 11, 1982Date of Patent: January 22, 1985Assignee: Kabushiki Kaisha Komatsu SeisakushoInventors: Hiroaki Tamaki, Joji Nakamura
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Patent number: 4333537Abstract: The device described contains a pneumatically operated hammer, a feeder controlling the flow of pneumatic fluid, an anvil which is struck repeatedly by the hammer, a drill bit attached to or integral with the lower end of the anvil, and an outer casing. The device is typically used as a down hole tool in rotary drilling operations and normally utilizes pressurized air as its pneumatic fluid. The pneumatic fluid first lifts the hammer above the anvil and second pushes the hammer downward to impact against the anvil in a striking movement. Simultaneous with striking, the pneumatic fluid above the hammer is expelled through an exhauster retained in the anvil and out through the drill bit where it is utilized to transport the cuttings from the hole being drilled. The feeder operates in conjunction with the hammer to control pressurization above and below the hammer, while exhaust above the hammer is controlled by the lower end of said feeder tube.Type: GrantFiled: October 28, 1980Date of Patent: June 8, 1982Inventors: Jesse W. Harris, Louis L. Lutich
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Patent number: 4280570Abstract: An impact and rotary rock drilling tool for operation by compressed air fed through a three-part control unit that contains a valve and duct system and is housed in a cage mounted to an outer tube. A central spindle tube is positively connected to the control unit and guides a main ram as well as an intermediate ram that rests on top of a steel drill member for reciprocating movement therewith. An insert portion secured inside the central spindle tube, which latter may comprise a check valve at its lower end, has partitions separating a plurality of passages with ports arranged in the central spindle tube for selected flow connections.Type: GrantFiled: April 17, 1979Date of Patent: July 28, 1981Inventor: Hans-Philipp Walter
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Patent number: 4278136Abstract: A down-the-hole rock drill including a drill bit provided at the lower end of a drill rod, which is rotatably driven by an above-the-ground motor. To increase the drilling efficiency and facilitate drilling of large-diameter holes a machine casing is positioned between the drill rod and the drill bit, said casing enclosing a hydraulic pump which is rotatably driven by the drill rod. The hydraulic pump delivers pressurized liquid to and drives the percussion unit including a hammer, the latter delivering blows against the drill bit at regular intervals. The machine casing also encloses at least one hydraulic motor driven by the pressurized liquid and arranged to rotate the drill bit. Hydraulically controllable blocking means prevent the machine casing from rotating relative to the drill hole wall while the drill bit is in operation.Type: GrantFiled: March 26, 1980Date of Patent: July 14, 1981Inventor: Gote I. Hansson
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Patent number: 4265321Abstract: A percussive rock drill and more particularly a percussive rock drill having improved means for passing a flow of flushing fluid therethrough.Type: GrantFiled: November 12, 1975Date of Patent: May 5, 1981Assignee: Joy Manufacturing CompanyInventor: George A. Hibbard
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Patent number: 4209070Abstract: The drill has a housing receiving therein a reciprocating striker, effecting percussive action upon the tool for breaking the rock at the face of the hole, mounted at the forward part of the housing, and upon the housing itself for propelling the drill in the hole. The housing also receives therein a mechanism for rotating the tool, including a self-controlled coupling provided with a movable sleeve and a stationary sleeve and adapted to transmit a torque to the tool in only one direction of rotation. The drill is provided with a device preventing a rearward motion of the housing and its rotation during a drilling operation. The drill is characterized by having a return device for retracting the tool from the face after it has been struck by the striker.Type: GrantFiled: January 10, 1978Date of Patent: June 24, 1980Inventors: Boris V. Sudnishnikov, Veniamin V. Kamensky, Eduard P. Varnello, Sergei K. Tupitsyn, Boris V. Nazarov
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Patent number: 4194581Abstract: A down hole percussion drill having an inner tube located within an outer tube guiding a ram for reciprocating movement relative to a drill steel. The drill steel and/or a wear bit secured thereto as well as retainers for them are provided with matching disharmonic polygonal profiles for sliding fit under load, free of edge pressure and with full power transmission by the lateral faces. The outer tube top end and a piston therein may have like polygonal connection. The inner tube is rigidly attached in the center of the outer tube by a unitary supporting head into which a coaxial control cylinder projects that has a valve seat for a mushroom valve with peripheral notches at its outer edge and further has an inner control tube with a slidable spring-loaded control sleeve for governing pneumatic fluid through suitable flow links.Type: GrantFiled: October 25, 1977Date of Patent: March 25, 1980Inventor: Hans P. Walter
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Patent number: 4174010Abstract: A percussive rock drill and more particularly a percussive rock drill having improved means for passing a flow of flushing fluid therethrough.Type: GrantFiled: August 15, 1977Date of Patent: November 13, 1979Assignee: Joy Manufacturing CompanyInventor: George A. Hibbard
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Patent number: 4146097Abstract: An air hammer embodying an outer housing structure connectable to a rotatable drill pipe string through which compressed air is conducted. A hammer piston reciprocates in the housng structure, compressed air being directed alternately to the upper and lower ends of the piston to effect its reciprocation in the structure, each downward stroke inflicting an impact blow upon the anvil portion of an anvil bit extending upwardly within the lower portion of the housing structure. The compressed air exhausts through a non-metallic elastic synthetic resin sleeve or tube fixed to the anvil and extending slidably into the lower portion of the hammer piston, the sleeve being deflectable laterally in the event of misalignment between the hammer piston and the anvil to prevent fatigue failure of the sleeve.Type: GrantFiled: April 7, 1975Date of Patent: March 27, 1979Assignee: Bakerdrill, Inc.Inventor: Alfred R. Curington
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Patent number: 4098352Abstract: A percussion bit for use with a down-the-hole drilling motor having a hammer which reciprocates in the motor to impact on the upper end of the bit. The bit has a working position in the motor and an idle advanced position. When the bit is in the idle advanced position, the hammer advances to an idle position and, at that time, it is desired for the hammer merely to rest on the bit without impacting the bit. The hammer is reciprocated by fluid pressure and, according to the present invention, a bypass channel is formed directly in the bit which exhausts one of the pressure chambers for the hammer when the bit is in its advanced position.Type: GrantFiled: December 17, 1976Date of Patent: July 4, 1978Assignee: Kennametal Inc.Inventor: John F. Kita
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Patent number: 4059279Abstract: A percussion drill in which a piston or ram is driven against the end of a drill rod comprises a tube extending through the piston and reaching into a bore at the end of the drill rod to deliver a fluid thereto for moving debris formed by the drilling operation. A socket is received in a bore of the drill rod and has a resilient lip which is deflected inwardly by the flared mouth of the drill rod bore while the tube has a tapered end which is engaged by the wall of a tapered bore formed in the socket.Type: GrantFiled: June 22, 1976Date of Patent: November 22, 1977Inventor: Roger Montabert
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Patent number: 4030554Abstract: An airhammer embodies an outer housing structure connectible to a rotatable drill pipe string through which compressed air is conducted. A hammer piston reciprocates in the housing structure, compressed air being directed alternately to the upper and lower ends of the piston to effect its reciprocation in the structure, each downward stroke inflicting an impact blow upon the anvil portion of an anvil bit extending upwardly within the lower portion of the housing structure. Upon elevating the airhammer off the bottom of the bore hole being drilled, the anvil bit drops downwardly of the housing structure to open one or more air bleeding grooves in the anvil bit, compressed air in the housing structure bleeding quickly through such grooves and preventing or stopping the hammer piston from reciprocating and impacting against the anvil bit.Type: GrantFiled: July 7, 1975Date of Patent: June 21, 1977Assignee: Bakerdrill, Inc.Inventors: Archer W. Kammerer, Jr., Alfred R. Curington
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Patent number: 3998279Abstract: An improved fluid operated rock drill apparatus having all fluid connections thereto secured to the yoke of the drill assembly by a unitary connector means. The yoke is centrally located so that the high pressure fluid being directed to the rock drill hammer piston flows through a path of reduced length resulting in a more efficient operation.Type: GrantFiled: June 21, 1974Date of Patent: December 21, 1976Assignee: Joy Manufacturing CompanyInventors: Edward A. Bailey, George A. Hibbard
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Patent number: 3990522Abstract: A drill housing is pivotally connected to the forward end portion of a boom member that swings upwardly from a frame of a mobile drilling machine. A hydraulic motor is secured to the gear housing and provides rotary power from a drive shaft through a pair of meshing gears to a drill chuck that is arranged to receive a drill bit or a roof bolt. A percussion weight is concentrically positioned within the drill housing and is axially aligned with the drill bit for imparting percussive forces to the drill bit. The percussion control is maintained through a servovalve that is supported on the drill housing and is controlled remotely by an electronic control module. The servovalve controls the flow of pressurized fluid from a source through ports in the drill housing connected to the servovalve by conduits to actuate a piston member for oscillation within the drill housing. Oscillation of the piston imparts a percussive force upon the percussion weight which is transmitted to the drill bit.Type: GrantFiled: June 24, 1975Date of Patent: November 9, 1976Assignee: Mining Equipment DivisionInventors: Harley G. Pyles, Charles D. Albright
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Patent number: 3990524Abstract: The motor is adapted to be used to drive a rotary drill rod of the type comprising an elongated pipe having a longitudinally extending bore therethrough, a percussive bit at the distal end thereof, and an abutment thereon relatively transverse the bore adjacent the bit. The motor comprises a cylindrically outlined piston member which is adapted to be slidably engaged in the bore of the pipe and has a fluid operated hammer mechanism thereon for applying hammer blows to the rod through the abutment. It also comprises an anvil member which is coaxially interconnected with the piston member at a position relatively forwardly of the hammer mechanism and has a diameter no greater than that of the piston member so that it can be inserted in the bore ahead of the piston member and engaged with the abutment to receive and transmit the hammer blows into the abutment.Type: GrantFiled: May 7, 1975Date of Patent: November 9, 1976Assignee: Tigre Tierra, Inc.Inventor: Gerald T. Sweeney
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Patent number: 3986565Abstract: Following is disclosed an improved split-type stop ring having two separable body portions forming an annular composite body with passage means useful with a fluid operated, percussion type drill motor for retaining a drill bit and enabling the by-pass of fluid when the bit is suspended above the bottom of a borehole. Fluid by-pass enables the continued flow of fluid to clean the borehole bottom while stopping the otherwise damaging piston-hammer reciprocation when the bit is suspended above bottom.Type: GrantFiled: December 26, 1974Date of Patent: October 19, 1976Assignee: Hughes Tool CompanyInventor: Gerald O. Atkinson
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Patent number: 3964551Abstract: A pneumatically operated impact drilling tool for rotary drilling, includes a reciprocating hammer, an anvil positioned under the hammer and a feeder means extending through the hammer. The drilling tool is connected in a string of drilling pipe and high pressure pneumatic fluid flowing through the drilling pipe operates the impact tool. The feeder directs and times the flow of fluid through ports in the hammer to create a first pressure zone to raise the hammer off the anvil, and a second pressure zone above the hammer to drive the hammer down against the anvil to create an impact on the drill bit. Exhaust ports in the hammer exhaust the fluid from the second pressure zone.Type: GrantFiled: September 20, 1974Date of Patent: June 22, 1976Assignee: Reed Tool CompanyInventor: Grey Bassinger
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Patent number: 3958645Abstract: An air hammer embodying an outer housing structure connectible to a rotatable drill pipe string through which compressed air is conducted. A hammer piston reciprocates in the housing structure along flexible inlet and outlet tubes, compressed air being directed alternately to the upper and lower ends of the piston to effect its reciprocation in the structure, each downward stroke inflicting an impact blow upon the anvil portion of an anvil bit extending upwardly within the lower portion of the housing structure. The piston contacts the housing structure at the upper and lower portions of the piston only, so that the piston can deviate upon flexing of the housing structure under load, and not bind in the housing structure, as permitted by the flexible inlet and outlet tubes.Type: GrantFiled: February 11, 1974Date of Patent: May 25, 1976Assignee: Bakerdrill, Inc.Inventor: Alfred R. Curington
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Patent number: 3946819Abstract: A tool adapted for connection to the lower end of a fluid supply line comprising: a housing; a tubular stem telescopically received by the housing for relative reciprocal movement therewith in response to fluid pressure communicated to the housing through the supply line; a working element attached to one end of the stem for movement therewith; and a valve assembly carried by the housing and responsive to predetermined movement of the stem relative to the housing to relieve fluid pressure within the tool, permitting a return of the stem and housing to their initial position relative to each other. In the method, the tool is attached to the end of a fluid supply line and inserted into a well conduit, the continuous supply line is inserted into the conduit until the tool reaches a preselected level; the tool is operated by applying fluid pressure thereto through the supply line; and the supply line is further fed into the conduit as the tool advances through the conduit.Type: GrantFiled: January 27, 1975Date of Patent: March 30, 1976Assignee: Brown Equipment & Service Tools, Inc.Inventor: James Edward Hipp
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Patent number: 3941196Abstract: An airhammer and core bit apparatus including a housing and a hammer piston reciprocable in the housing for delivering repeated impact blows to an anvil secured to or forming part of a core bit which produces a core in a bore hole being drilled. A central core receiving tube extends through the housing and hammer piston, through which the core formed by the bit is conducted upwardly and through the hammer piston to the top of the bore hole, part of the compressed air supplied to the airhammer being diverted to the central tube for elevating the core therewithin toward the top of the bore hole.Type: GrantFiled: October 24, 1974Date of Patent: March 2, 1976Assignee: Bakerdrill, Inc.Inventors: Alfred R. Curington, Theodore J. Roscoe, Jr.