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| Number | Title | Issue Date |
| 7198120 | Down-the-hole drill assembly The invention provides a down-the-hole drill assembly having exhaust passages from upper and lower chambers past the inner end of a bit and through the body of the bit to exit through the bit face. The construction of the assembly and bit obviates a foot valve tube ... | 04/03/2007 |
| 6994175 | Hydraulic drill string A hydraulic drill string device can be in the form of a percussive hydraulic in-hole drilling machine that has a piston hammer (50) with an axial through hole (51) into which a tube (35) extends. The tube forms a channel for flushing fluid from ... | 02/07/2006 |
| 6896071 | Drive systems and methods for sheet piles A drive system for driving a sheet pile member at a desired location in the ground. The drive system comprises a source of pressurized air, an actuator system defining a drive axis, and an adapter member. The actuator system comprises a housing assembly having an in... | 05/24/2005 |
| 6883618 | Variable timing for front chamber of pneumatic hammer The lower end portion of a pneumatic impact hammer cylinder has at least one upper fluid passage and at least one lower fluid passage. A U-shaped sleeve is mounted in a circumferential groove in the lower end portion of the piston. The sleeve includes a base, upper ... | 04/26/2005 |
| 6866104 | Drop in dart activated downhole vibration tool A downhole vibration tool consisting of a body assembly installed in a work string, and a drop-in dart valve assembly. An open inner bore through the body assembly allows the performance of operations through the body assembly. To activate the vibration tool, the da... | 03/15/2005 |
| 6736218 | Diesel hammer systems and methods A diesel hammer system for driving piles. In one form of the invention, a control pinion is attached to a cam member employed to adjust the volume of a fuel portion of a pump chamber. A control rack is arranged to engage the control pinion such that linear movement ... | 05/18/2004 |
| 6717055 | Harness fixing device The harness fixing device comprises: a rotatable member for holding a wiring harness; and a fixing device body for holding the rotatable member rotatably in the circumferential direction, wherein the rotatable member is provided with a harness guiding wall having a ... | 04/06/2004 |
| 6626247 | Mechanism to fasten adaptors to a head portion of a post driver The present invention provides a post driver which includes various post adaptors having different cross-sections. The post adaptors can be attached to, and detached from, a head portion of the post driver. An adaptor is attached to the head portion by re... | 09/30/2003 |
| 6499544 | Percussive down-the-hole hammer for rock drilling, and a one-way valve used therein A down-the-hole percussive hammer includes a casing, a drill bit attached to a lower end of the casing, and a reciprocable hammer for impacting against the drill bit. A top sub attached to an upper end of the casing includes a central passage for conducti... | 12/31/2002 |
| 6371222 | Hammer device A hammer device has a machine housing (1) with a hammer piston (2) movable to-and-fro. The to-and-fro movement of the hammer piston is controlled by a valve body (6) movable to-and-fro in the machine housing. The valve body, via a channel (7), alternative... | 04/16/2002 |
| 6209659 | Hand-held drill with a compressed air-operated hammer mechanism A hand drill including a housing (2), a rotary drive (8-15) arranged in the housing (2) for driving a chuck (6) provided at a front, in the drilling direction, end of the housing and in which a drill or a chisel tool is received, a compressed air-operated... | 04/03/2001 |
| 5992545 | Down-the-hole drilling machine Down-the-hole drilling machine comprising a housing (1) with a hammer piston (5) movable to-and-fro and intended to exert a drill bit (3) to impacts. The hammer piston is formed with two piston heads (6,7) and a waist (9) between them. An intermediate wal... | 11/30/1999 |
| 5806608 | Air-driven post driver An air-driven post driver that includes a hammer assembly and a post receiving assembly. The hammer assembly includes an air-driven piston hammer slidably disposed within a cylinder bore of a cylinder body having a circumferential compressed air groove of... | 09/15/1998 |
| 5778987 | Guided drilling system with shock absorber There is provided a guided drilling system and an in-the-hole shock absorber adapted thereto. The guided drilling system includes a drill string configured to continuously and accurately bore a hole in the ground without the need to periodically break the... | 07/14/1998 |
| 5685380 | Reverse circulation down-the-hole drill A reverse circulation down-the-hole drill includes an outer wear sleeve (1) and a backhead (2) assembly located at one end of the outer wear sleeve (1) for connecting the drill to a double-walled drill string and to a source of pressure fluid to actuate t... | 11/11/1997 |
| 5350023 | Pneumatic hammer A pneumatic hammer is provided with an adjusting piston (37) dependent on the supply pressure, which adjusts the stroke length of the working piston (16). Thereby, the same pneumatic hammer may be operated both at low and high supply pressures. With high ... | 09/27/1994 |
| 5234061 | Percussion machine, for example self-propelled ram boring machine In a percussion mach in particular a self-propelled ram boring machine, with a percussion piston which is axially movable in the machine housing, has a hollow piston rod and is acted on by a pressure medium via a supply hose connected to the rear end of t... | 08/10/1993 |
| 5115875 | Hammer drills for making boreholes 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 suppl... | 05/26/1992 |
| 5056609 | Valve assembly for a downhole to remove bore hole subsidence A downhole hammer having a fluid inlet controlled by a check valve. The valve assembly is used to remove subsidence from a bore hole to prevent problems caused by bore hole collapse. The valve assembly contains a housing and fluid inlet and outlet. A valv... | 10/15/1991 |
| 4921056 | Hammer drills for making boreholes 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 suppl... | 05/01/1990 |
| 4917194 | Improved downhole hammer A downhole hammer is provided comprising a casing having a top sub at one end and a drill bit and support at the other end. A central tube is extended therethrough to define an annular space between the casing and the tube. A reciprocating piston is accom... | 04/17/1990 |
| 4911250 | Pneumatic percussion hammer A pneumatic percussion hammer casing (10), a top sub (23) connected to the outer tube of a double tube drill stem, an air feed pipe (19) extending from the top sub (23) co-axially into the casing and co-axially about an air outflow pipe (21) connected at ... | 03/27/1990 |
| 4886128 | Ram boring implement having a movable bit A ram boring implement having a pneumatically or hydraulically driven percussion piston, movable axially in a reciprocating manner in a housing, and an axially movable bit which is connected to an end of the housing and acted upon directly or indirectly b... | 12/12/1989 |
| 4660658 | Hydraulic down-the-hole rock drill Pressurized water is used to operate a percussive down-the-hole drill and the spent motive fluid is used as a flushing fluid. A rear cylinder chamber (24) is constantly pressurized and a valve (28) controls the inlet from the chamber (24) to a bore (23) t... | 04/28/1987 |
| 4651833 | Pneumatic impact tool A pneumatic impact tool wherein a two-stage piston is reciprocable in the two-stage chamber of a cylinder. The tool which is to penetrate into a bone is mounted in the front portion of the cylinder and the piston strikes against such front portion in resp... | 03/24/1987 |
| 4637476 | Percussive action machine for making holes in the ground A percussive action machine includes a housing in which a hammer is movably secured to define a forward stroke chamber and a return stroke chamber. The hammer is provided with an air-distributor fashioned as a sleeve having holes. The hammer is further pr... | 01/20/1987 |
| 4530408 | Porting system for pneumatic impact hammer A pneumatic downhole impact drill having a porting system for automatically and sequentially supplying pneumatic pressure fluid from a fluid delivery tube received within a central coaxial bore in an impact piston to the opposite ends of the piston operat... | 07/23/1985 |
| 4450920 | Hydraulic reciprocating machines A reciprocating machine comprising a cylinder with a drive chamber and a return chamber; a piston arranged to move to and fro in the cylinder with a first piston area exposed to the drive chamber and being smaller than a second piston area exposed to the ... | 05/29/1984 |
| 4446929 | Fluid operated rock drill hammer A fluid operated rock drill hammer includes an annular hammer body with the upper end of the hammer body adapted to be connected to a drill string and with a drill chuck mounted at the lower end of the hammer body. A drill bit extends through the drill ch... | 05/08/1984 |
| 4312412 | Fluid operated rock drill hammer A fluid operated rock drill hammer includes an annular hammer body with the upper end of the hammer body adapted to be connected to a drill string and with a drill chuck mounted at the lower end of the hammer body. A drill bit extends through the drill ch... | 01/26/1982 |
| 4308925 | Pneumatic impact motor A reciprocating pneumatic motor for rock drills and the like wherein a freely-movable hammer piston repeatedly strikes the end of a drill rod, usually a rotating drill rod. Fluid under pressure enters a single, central inlet port in the wall of a cylinder... | 01/05/1982 |
| 4305473 | Power control device for pneumatic motors A power control device for a pneumatic motor includes a pressure air supply flow limiting means in the form of a flow restriction having a diverging, pressure recovering outlet. The device also comprises a load responsive pressure relief means which is lo... | 12/15/1981 |
| 4278135 | Variable volume pneumatic drill A Pneumatic impact drilling tool, particularly useful as a downhole pneumatic drill, includes a housing structure adapted to be connected to a string of drill pipe and supplied with compressed air therethrough. A hammer piston reciprocates in the housing ... | 07/14/1981 |
| 4159040 | Pneumatic percussion tool A distinguishing feature of the present invention consists in that the menism for driving in rod-shaped elements into compact or frozen ground comprises a guide tube to accommodate said rod-shaped element. The tube extends throughout the length of the sh... | 06/26/1979 |
| 4100976 | Pneumatic impact drilling tool A pneumatically operated impact drilling tool for earth drilling, includes a reciprocating hammer, an anvil positioned under the hammer and a feeder tube extending through the hammer and at least partially through the anvil. The drilling tool is connected... | 07/18/1978 |
| 4070948 | Pneumatic impact devices The present invention relates to pneumatic impact devices and can be used to the best advantage for making holes in compacted soils. The device is provided with a hollow casing which accommodates a stepped ram with the maximum-diameter step in its front part. ... | 01/31/1978 |
| 4054180 | Impact drilling tool having a shuttle valve An impact drilling tool for rotary drilling which includes a reciprocating hammer inside a casing for striking the top of an anvil. A drilling bit is connected to the opposite end of the anvil for cutting into the earth's formations. The casing is connect... | 10/18/1977 |
| 3970153 | Pneumatic percussion machines A pneumatic percussion machine such as a drill, having a piston reciprocating in a casing, chambers formed in casing at or towards the ends of the piston, the arrangement permitting compressed air to be supplied alternatively to the chambers, the compress... | 07/20/1976 |
| 3964551 | Pneumatic impact drilling tool 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 ... | 06/22/1976 |
