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| Number | Title | Issue Date |
| 8033343 | Water powered impulsive unit An impulsive unit for a jack hammer or rock drill is adapted to be powered by water, and comprises a piston slidable within a cylinder, and carrying a striker portion thereon. At least a portion of the piston and/or cylinder is coated with ceramic. The ceramic is mo... | 10/11/2011 |
| 7426965 | Power transmission unit of an impactor, a hydraulic jet impactor and the application thereof The invention discloses a fluid-driven impactor, a power transmission mechanism for the impactor and the use of the impactor. In the prior art, the working life of the impactor is short, since a rubber primary seal and an upper fluid-diverging lid for the fluid-driv... | 09/23/2008 |
| 7422074 | Delayed compression sleeve hammer A sleeve carried by and preferably slidable relative to the piston, for controlling air passages associated with a central air feed tube, whereby retraction pressure is applied to the piston substantially at impact. It is the impact itself of the piston against the ... | 09/09/2008 |
| 7357194 | Percussion power tool A percussion power tool includes a motor (6) located in the tool-housing (4) for driving the output member (12) and the percussion mechanism (10), a chuck (20) for receiving a working tool (22), a locking mechanism (24 | 04/15/2008 |
| 7175176 | Device for feeding suction air or blowing air in a sheet-processing machine A device for feeding suction air or blowing air to a sheet-retaining device displaceable relative to a machine element in a sheet-processing machine, includes a first air-feeding element connectible in terms of flow to a suction-air or blowing-air source. A second a... | 02/13/2007 |
| 7152692 | Hydraulic hammer having a sealing bushing A hydraulic hammer having a sealing bushing includes a percussion piston that delivers strokes to a tool. A lower part of the percussion piston is sealed with respect to a frame by the sealing bushing, which includes one or more lower seals. The sealing bushing does... | 12/26/2006 |
| 7111695 | Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium The invention relates to a method for horizontal ground drilling, in particular for rock drilling, by means of a ground drilling apparatus which can be driven forward in rotation and percussively, the apparatus having compressed air and drilling medium applied to it... | 09/26/2006 |
| 7111691 | Breaking hammer, and fastening element, side plate, and protective casing of breaking hammer A crushing hammer, and a fastening element, side plate, and protective casing for the crushing hammer. The crushing hammer comprises at least two alternative fastening elements with which it can be fastened to a boom of a work machine. The fastening can be done with... | 09/26/2006 |
| 7073607 | Operating system for hydraulic rock drill A hydraulic rock drill comprises a housing having a piston and valve bore formed therein, a rotation motor, and a fluid connection and fluid reservoir interposed between the housing and the rotation motor. Fluid connections to the hydraulic rock drill comprise a sin... | 07/11/2006 |
| 7040417 | Drilling systems The present invention discloses, in certain aspects, systems and methods for producing cyclical impacts and, in certain aspects for moving a drilling apparatus for drilling a borehole in a formation, the system in certain embodiments including a housing with a longi... | 05/09/2006 |
| 7017679 | Device for the continuous adjustment of unbalance of steerable vibration plates The invention relates to steerable vibration plates that are set vibrating by rotating unbalanced masses. By twisting the unbalanced masses relative to one another the resulting forces and their direction of action can be changed, thereby influencing the travel spee... | 03/28/2006 |
| 7011156 | Percussion tool and method A percussion apparatus and method of using the percussion apparatus. The apparatus may be used for delivering an impact to a tubular string. The apparatus comprises a cylindrical member having an internal bore containing an anvil and a first guide profile. The appar... | 03/14/2006 |
| 6763901 | Air delivery system for a direct push drilling swivel A power swivel provides the rotational force to drill consolidated subsurface strata while an unrestricted airflow through the swivel and down a drill string remove cuttings from the borehole. The power swivel is configured to mount on direct push equipment, such as... | 07/20/2004 |
| 6752222 | Downhole percussion drills Provided is a downhole percussion drill, which is installed at an end portion of a drillstring and performs drilling by giving impact blows to a drill bit at the bottomhole, which includes a hydraulic hammering mechanism 7 which uses oil having high lubricati... | 06/22/2004 |
| 6675909 | Hydraulic jar An improved bidirectional hydraulic jar. The jar comprises a two-ring valve assembly supported preferably on the inner mandrel for reciprocal movement inside a fluid chamber. The chamber comprises two larger portions joined by a narrowed restrictor portio... | 01/13/2004 |
| 6550554 | Rock drill The invention concerns a reverse circulation rock drill having a backhead attached to a piston and cylinder assembly between the backhead and a drill bit assembly and around a sample tube with the outer walls of the sample tube and piston profiled to prov... | 04/22/2003 |
| 6227307 | Sound and dust proof breaker A hydraulic breaker for absorbing and reducing vibration and noise generated from the breaker and for reducing debris and dust scattered from the impact tool during using the breaker is provided. Space between main body of the breaker and outer housing is... | 05/08/2001 |
| 6131672 | Percussive down-the-hole rock drilling hammer and piston therefor A down-the-hole percussive drill comprises a casing, a drill bit mounted at a lower end of the casing, a hollow feed tube fixed within the casing and extending along a center axis thereof, and a piston mounted for axial reciprocation within the casing for... | 10/17/2000 |
| 6125952 | Percussive down-the-hole hammer and a drill bit therefor In an air actuated down-the-hole hammer for rock drilling, a piston reciprocates within a casing to impact against a rear anvil surface of a drill bit. A foot valve extends axially between the piston and the drill bit. The anvil surface is inclined downwa... | 10/03/2000 |
| 6062322 | Precussive down-the-hole rock drilling hammer A down-the-hole percussive drill comprises a casing, a drill bit mounted at a lower end of the casing, a hollow feed tube fixed within the casing and extending along a center axis thereof, and a piston mounted for axial reciprocation within the casing for... | 05/16/2000 |
| 6050346 | High torque, low speed mud motor for use in drilling oil and gas wells A improved "mud motor" for use in oil and gas well drilling includes a reciprocating valve and piston arrangement that generates power using drilling fluid media (e.g., drilling mud) pumped through an inlet port to form a differential across a piston seat... | 04/18/2000 |
| 6050347 | In Hole hammer An in-hole hammer for boring in ground has an elongated hollow housing carrying an internal striking piston in a piston chamber. An exchangeable boring head is threadably connected to the forward end of the housing and the striking piston impacts against ... | 04/18/2000 |
| 5984021 | Porting system for back chamber of pneumatic hammer A pneumatic downhole impact drill has a porting system for automatically supplying pneumatic pressure fluid from a fluid delivery tube received within an axial bore in the impact piston to the opposite ends of the piston operating cylinder as the piston r... | 11/16/1999 |
| 5853052 | Hydraulic drive for rotation of a rock drill The invention provides an In-The-Hole hydraulic drive unit for rotating a rock drill. A hydraulic motor having a fixed rear trailing end and a rotating front drilling end converts hydraulic power into a rotational drive force. The hydraulic motor receives... | 12/29/1998 |
| 5680904 | In-the-hole percussion rock drill A hydraulic reciprocating percussion tool, particularly adapted for drilling applications, comprises an elongated cylinder, opposed fronthead and backhead members and a central bore in the cylinder for supporting a reciprocating piston hammer. The piston ... | 10/28/1997 |
| 5419403 | Pneumatic hammer A pneumatic hammer is provided which includes a working piston (16) movable in a working cylinder (22) and defining therewith front and rear cylinder working chambers (23, 24, respectively). The working piston (16) impacts upon an anvil (15) to drive a dr... | 05/30/1995 |
| 5402854 | Fluid distributor for a debris flushing system in a percussive, fluid-activated apparatus A fluid distributor for a debris flushing system in a fluid-activated jackhammer includes a bore through a reciprocal piston, for fluid flow into an exhaust chamber, a fluid distributor removably mounted in the piston bore, the fluid distributor operating... | 04/04/1995 |
| 5396965 | Down-hole mud actuated hammer Improvements in down-hole mud actuated hammers are disclosed. According to its broadest aspect the invention is a down-hole mud actuated hammer for use in a drill string, which includes a housing with an upper end having means for connecting to the drill ... | 03/14/1995 |
| 5372196 | Hammer drill device Hammer device comprising a machine housing (1) with a hammer piston (2) movable to-and-fro. The movement to-and-fro of the hammer piston is controlled by a valve body (6) movable to-and-fro in the machine housing. In order to speed up the turning of the h... | 12/13/1994 |
| 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 |
| 5318140 | Fluid operated drill apparatus Down-the-hole drill comprising a housing (1), a hammer piston (6) movable to-and-fro in the housing and intended for impacting a drill bit (5). A back piece (3) provided with an extension (12) with a valve part (17) cooperates with a part (8) of a central... | 06/07/1994 |
| 5307881 | Flushing system for a percussive, fluid-activated apparatus A debris flushing system for a percussive, fluid-activated apparatus includes a first and second separate and independent flushing system in the apparatus, each flushing system having a separate combination of passageways in the apparatus for fluid commun... | 05/03/1994 |
| 5293959 | Low pressure system lubrication for a jackhammer A percussive, fluid-activated jackhammer includes a low pressure lubrication system having a liquid lubrication reservoir chamber formed in a bore of the jackhammer, the lubrication chamber being subject to low percussive fluid pressure in a front piston ... | 03/15/1994 |
| 5156223 | Fluid operated vibratory jar with rotating bit 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 ... | 10/20/1992 |
| 5139096 | Pneumatic percussion hammers A pneumatic percussion hammer for attachment to a drill tube is coaxially constructed about an outflow tube which is mounted therein for axial removal and replacement when worn. A cylindrical piston moves axially between a top sub wherein a drill stem is ... | 08/18/1992 |
| 5131476 | Down hole percussion drill apparatus A downhole percussion drill or hammer (100) is disclosed having an outer casing (2) in which a reciprocating piston (26) which periodically impacts a drilling bit (16) disposed at a bottom end of the casing. A top chuck (1), attached to the top end of the... | 07/21/1992 |
| 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 |
| 5107944 | Down hole drills using spent driving fluid for flushing purposes 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 lo... | 04/28/1992 |
| 5085284 | Hybrid pneumatic percussion rock drill A fluid actuated percussion rock drill comprising a hollow wear sleeve and a piston slidingly disposed within the wear sleeve. Drive and return pressure surfaces bias the piston between drive and return positions, respectively. A high pressure port is inc... | 02/04/1992 |
| 5080179 | Down the hole hammer equipment The invention is concerned with pneumatic percussion drilling equipment with advantageous manufacturing simplicity and effective piston area to casing size consisting essentially of an elongate hollow casing housing a piston assembly and having a backhead... | 01/14/1992 |
