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| Number | Title | Issue Date |
| 8122972 | Drive mechanism for a power tool A hollow piston drive mechanism for a hammer drill comprises a crank pin 54 having a cylindrical link member 68 rigidly connected to a part-spherical bearing 70. The part-spherical bearing 70 is slidably and rotatably disposed in a part-s... | 02/28/2012 |
| 7896098 | Power tools Power tools are taught that may include, for example, means for detecting impact sounds generated, e.g. by a hammer strikes an anvil or by oil pulse from an oil unit. The detecting means may include a receiver (30) adapted to selectively convert sound within ... | 03/01/2011 |
| 7677327 | Percussion mechanism for a repetitively hammering hand power tool A percussion mechanism for a repetitively hammering hand power tool in the form of a rotary hammer has a striker movable axially forward and backward in a guide barrel and imparting impacts directly and without any intermediate parts to an end section of a tool bit ... | 03/16/2010 |
| 7516801 | Impact mechanism for a repeatedly striking hand-held machine tool A percussion mechanism for a repetitively hammering hand power tool, whose striking frequency and striking intensity are controllable independently of one another, has a striker (2), movable axially forward and backward in a guide barrel (1), and a dev... | 04/14/2009 |
| 7337859 | Method and device for drilling a channel In a drilling method for creating a channel leading from surrounding soil into a shaft which is separated from the soil by a wall, a channel is drilled through the soil from a starting pit in the direction of the shaft using a first drill head. The first drill head ... | 03/04/2008 |
| 7281575 | Field adjustable impact jar An impact jar including a biasable member, an impactor and an impactee slidably coupled to the impactor. The impactor includes a first down-hole tool connector. The impactee includes a second down-hole tool connector distal from the first down-hole tool connector an... | 10/16/2007 |
| 7207749 | Method and apparatus for installing underground pipe A method and apparatus employing an axially elongated ground piercing tool for forming an in-ground tunnel under a surface structure with forward axial movement of the tool in the ground under the structure with a pipe carried by the tool for depositing in the tunne... | 04/24/2007 |
| 7174972 | Electrical hand-held power tool with non-contacting electrical manual control switch An electrical hand-held power tool includes a non-contacting electrical manual control switch (3) having an operating element (4) and a sensor switch (5), a pivotable carrier (6) which carries a switching element (13) and which is ... | 02/13/2007 |
| 7156189 | Self mountable and extractable ultrasonic/sonic anchor Self drilling anchors and related methods and apparatus. In one embodiment an apparatus comprises a drill bit, a hammer mechanism for hammering the drill bit in a first direction and in a second direction, and a selection mechanism for controlling whether, at a give... | 01/02/2007 |
| 7131503 | Impact driver having a percussion application mechanism which operation mode can be selectively switched between percussion and non-percussion modes An impact driver capable of boring and having an excellent usability is provided. An anvil(8) is arranged so as to slightly move in the axial direction. A first cam(29) having cam gears(30, 30 . . . ) is externally provided at the anvil so as to... | 11/07/2006 |
| 7131922 | Ram-type tensioner assembly having integral hydraulic fluid accumulator The invention is directed to a tensioner assembly for providing tensile force from a floating vessel at the surface of the ocean to the blowout preventer stack, or production tree, which is connected to the wellhead at the sea floor. The tensioner assembly compensat... | 11/07/2006 |
| 7128165 | Excavation system and method A system and method of cutting a core out of a finished surface for keyhole excavation provides a truck with a turret to which a support arm supporting the cutter assembly is mounted, and a stabilizing member remote from the turret, which allows the turret to be rot... | 10/31/2006 |
| 7114576 | Method and arrangement of controlling of percussive drilling based on the stress level determined from the measured feed rate The rock drill apparatus (1) comprises a rock drill machine (6) provided with a percussion device (4), a feed device (9) and a tool (7), the tool (7) end comprising a bit (8) for breaking rock. The tool (7) is ... | 10/03/2006 |
| 7111678 | Field adjustable impact jar An impact jar including a biasable member, an impactor and an impactee slidably coupled to the impactor. The impactor includes a first down-hole tool connector. The impactee includes a second down-hole tool connector distal from the first down-hole tool connector an... | 09/26/2006 |
| 6991459 | Impactor and paste feeder An impactor for safely, efficiently, and effectively placing mercury-free dental restorations in a cavity of a patient's tooth, the impactor having a housing, anvil, hammer, solenoid or other transducer, end cap, source of restoration paste, and paste feeder tube fo... | 01/31/2006 |
| 6889777 | Implement for driving posts A post driving implement for use with a vehicle, such as a tractor or a skid loader, is disclosed. The post driving implement is comprised of a hammer, a hammer channel, and a hammer cylinder. The hammer travels longitudinally within the hammer channel and is lifted... | 05/10/2005 |
| 6454021 | Impact machine The invention provides an impacting device capable of , crushing or drilling work with reduced noise or vibration, with high crushing efficiency, high energy efficiency, increased output and prolonged durability A super magnetostrictive material (1) is ar... | 09/24/2002 |
| 6315059 | Portable water well drill The present invention is a portable drilling rig having a support tower. A drilling engine, mounted within a cradle, and a lift winch are attached to the support tower. A stabilizer bar is attached to the lower end of the support tower to prevent swaying ... | 11/13/2001 |
| 6061933 | Compactor for use with backhoe method and apparatus To compact soil, an impact apparatus includes a weight within a steel frame that may be carried by a vehicle mounted backhoe and placed over the surface to be compacted or broken. The weight is lifted and released by a cable. To pull the cable, a hydrauli... | 05/16/2000 |
| 6050345 | Ergonomic tool with lift assist mechanism An ergonomic demolition tool includes a jackhammer and a lift assist mechanism having a wheeled caster assembly. The lift assist mechanism has a frame which is movable between upper and lower positions to provide a lifting force to assist the jackhammer o... | 04/18/2000 |
| 5787995 | Water driven hammer device A water driven hammer device has a machine housing and a hammer piston movable to-and-fro in the machine housing. The hammer piston is guided in the machine housing in two guides separated from each other. The guides are formed from two parts each having ... | 08/04/1998 |
| 5718297 | Hydraulic impact hammer The impact hammer comprises a working piston (22) exerting impacts onto an impact surface (23). The hydraulically driven working piston (22) is reciprocatingly controlled by a control means (40,41). At the rearward end of the working cylinder (21), there ... | 02/17/1998 |
| 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 |
| 5667021 | Apparatus for driving grade stakes A grade stake driver includes a frame for supporting a hammer and a grade stake under the hammer. A shuttle secured to the hammer movably mounts onto the frame to connect the hammer to the frame. A hoist secured to the shuttle mounts onto the frame to per... | 09/16/1997 |
| 5662180 | Percussion drill assembly A compressor piston divides a first compartment into two compression chambers, while a hammer piston divides a second compartment into two drive chambers, each of the compression chambers being connected to a respective one of the drive chambers to form a... | 09/02/1997 |
| 5379849 | Hydraulic ram assemblies A hydraulic ram assembly is provided to be used, singly or in multiples, in raising a weighted member, such as a hammer (30) for pile driving, each having means whereby fluid used to extend a respective piston (26) can readily escape to give a sudden rele... | 01/10/1995 |
| 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 |
| 5247835 | Pile tester A self-contained unit has a probe (N) urgeable against a structure to be tested, a shock assembly (H, I, J, F, M) for applying a shock to the structure through the probe (N), and a transducer (A, B, C) for receiving resulting vibrations from the structure... | 09/28/1993 |
| 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 |
| 5014796 | 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... | 05/14/1991 |
| 4625811 | Hydraulic vibratory pile driver A vibratory pile driver has a rigid housing, a pair of parallel and horizontally spaced shafts journaled for rotation wholly independently of each other about respective parallel and horizontally spaced axes in the housing, respective generally equally ma... | 12/02/1986 |
| 4593768 | Hydraulically operated impact device In a hydraulic rock drill there is a hydraulic so called recoil damper that damps the reflected shock waves that propagates from the rock backwardly through the drill stem. The damper comprises a support piston (68) slidably in a cylinder so that a pressu... | 06/10/1986 |
| 4548279 | Tool extractor A demolition tool is provided with an extractor for removing the chisel or drill from the working surface. The extractor is a piston equipped with a foot which maintains contact with the work surface. When the tool is to be extracted the piston is actuate... | 10/22/1985 |
| 4494614 | Hydraulically operated impact device In an hydraulic rock drill there is an hydraulic so called recoil damper that damps the reflected shock waves that propagates from the rock backwardly through the drill stem. The damper comprises a support piston (68) slidably in a cylinder so that a pres... | 01/22/1985 |
| 4483402 | Paving breaker A paving breaker for the construction industry of the type having a vibrating moil point or tool steel impacted by a pneumatically reciprocated piston including a double walled cylinder slidably receiving the piston designed so that the space between the ... | 11/20/1984 |
| 4479551 | Actuator for a hydraulic impact device A linear actuator includes a ram and a piston separated by a column of hydraulic fluid in a housing. Upward movement of the ram in the housing first seals a finite quantity of hydraulic fluid in the housing cavity. Continued upward ram movement then cause... | 10/30/1984 |
| 4479550 | Submerging ramming arrangement A submerging ramming arrangement has a housing, an impacting body axially displaceable in the housing for delivering ramming impacts against a ramming pile, a hydraulic drive for displacing the impacting body in the housing, a hydraulic cylinder-and-pisto... | 10/30/1984 |
| 4453773 | Pavement breaking apparatus Apparatus for breaking concrete and asphalt pavement and the like comprising a frame adapted to be supported by and above pavement to be broken. Power operated means move the frame in one and opposite directions relative to and in parallel relationship wi... | 06/12/1984 |
| 4448338 | Pneumatic nail driver In a pneumatic nail driver, compressed air drives a working piston in the driving direction within a working cylinder. An inlet valve controls the flow of compressed air into the working cylinder. A sensing element mounted on the front end of the driver m... | 05/15/1984 |
| 4410050 | Machine for inserting rigid members in the soil A continuously slowly moving machine automatically inserts rigid elongated members in the ground at regular intervals along the perimeter of a large field to facilitate anchoring a taut textile net placed over seedling grass. Several thousand of the membe... | 10/18/1983 |
