Abstract: The invention relates to a drill rod coupling having a sleeve-shaped coupling receptacle, a pin-shaped coupling member which can be inserted axially into the coupling receptacle to form a torque proof connection, and at least one locking bolt which is directed transversely to the axial coupling direction and extends, in a locked coupling position, between the coupling receptacle and the coupling member into a locking recess, wherein the locking bolt is mounted so as to be radially adjustable between an unlocking position and a locking position. Efficient coupling is achieved in that a tensioning device is provided by means of which the locking bolt is pressed into its locking position with a predefined tensioning force, and in that the locking bolt is connected to a resetting member by means of which the locking bolt can be reset into the unlocking position when a resetting force is applied.

Abstract: A dual frequency ultrasonic and sonic actuator with constrained impact mass is presented. According to one aspect, displacement of the impact mass is constrained by cavity to which ultrasonic stress from the tip of a horn is applied. According to another aspect, the displacement of the impact mass is constrained by a spring attached to the tip of the horn. According to another aspect, the displacement of the impact mass is constrained by a flexure. The constrained impact mass converts the ultrasonic stress to lower frequency sonic stress that is coupled to a transmitting element for transmission through a surface. According to one aspect, the transmitting element is a longitudinal probe. According to another aspect, the transmitting element is a drill bit used to penetrate though the surface. According to another aspect, the transmitting element is a thumper used to transmit elastic waves though the surface.

Abstract: An alignment and installation jig for a screw anchor driving machine. The alignment and installation jig includes a laser target that can be moved from an alignment position to a driving position. The jig may also include one or more automated crimping assemblies to form permanent connections between overlapping foundation components while the machine is correctly oriented.

Abstract: A gear feed system includes a carrier and a mast mounted on the carrier. The mast includes a pair of panels forming opposing sides of the mast along a central axis of the mast. Each of the pair of panels includes a fixed rack attached to an interior surface of the each of the panels. A gear carrier pair includes a gear, a movable rack assembly, and a cylinder. Each of the gear is coupled to one of the panels and each of the gear couples one of the fixed racks to one of the movable rack assemblies (hoist tubes). The cylinder and the movable rack assembly are coupled via the gear wherein an axial movement of the cylinders causes a corresponding axial displacement of the movable rack assemblies.

Abstract: This hydraulic drilling apparatus including a casing comprising a front part, a shank including a fluid injection conduit and intended to be coupled to at least one drill rod equipped with a tool, the shank, a striking piston slidably mounted inside the casing along a striking axis (A) and configured to strike the shank, an extraction piston disposed around the shank and comprising an extraction portion configured to cooperate with the shank, and a cartridge removably mounted on the front part and disposed around the shank, the cartridge including an injection part configured to fluidly connect the fluid injection conduit to a fluid delivery conduit. The cartridge delimits a receiving housing in which the extraction piston is slidably mounted.

Abstract: A sleeve is disclosed for use with a piston of a hydraulic hammer. The sleeve may have a generally cylindrical body with a top end and a bottom end, and a central bore passing axially from the top end of the generally cylindrical body to the bottom end. The generally cylindrical body may be a composite structure including a guide layer forming an inner annular surface of the central bore, an energizer layer located radially outward of the guide layer and being bonded to the guide layer, and a support layer bonded to the energizer layer. The support layer may form an outer surface of the generally cylindrical body.

Abstract: A breaking device includes a frame, an impact device having a pressure chamber with a rear pressure chamber and a front pressure chamber. The breaking device further includes a first low pressure port at the rear pressure chamber, a first low pressure channel and a first low pressure accumulator connected to the first low pressure channel. The breaking device further includes a second low pressure port at the rear pressure chamber substantially opposite to the first low pressure port, second low pressure channel and a second low pressure accumulator connected to the second low pressure channel. The first low pressure accumulator and the second low pressure accumulator are arranged at the outer circumference of the frame of the breaking device at different positions in the axial direction of the breaking device.

Abstract: A fastener driving apparatus includes a spring anvil assembly that comprises a gas spring and an anvil. The end of the piston that extends out of the gas spring may be fixedly disposed against an object that is capable of exerting a force against the piston for at least a portion of the operational cycle. A drive mechanism acts on the spring assembly to store potential energy in the spring. The drive mechanism thereafter ceases acting on the spring assembly and the potential energy is released, causing the spring anvil assembly move and to separate from the drive mechanism for a period of free flight of the spring anvil assembly, the anvil thereafter moving to strike a fastener to drive the fastener into a substrate.

Abstract: A valve of a hydraulically striking device having a housing, the housing having a moving member being seated inside the housing to move in a reciprocating manner by means of a hydraulic fluid. The moving member has an inner space, the housing has at least a first abutment surface abutting the moving member, the first abutment surface of the housing has a first surface located in a radial inner portion of the first abutment surface, wherein the first surface is arranged in fluid communication with the inner space, and a second surface located in a radial outer portion of the first abutment surface, wherein the second surface is arranged to form a sealing surface.

Abstract: Disclosed is a fluid hammer tool with two separate fluid hammers in separate sections of the tool. The tool includes an upper poppet valve assembly along one fluid flow path, and a lower poppet valve assembly along a separate outer flow path. Both fluid flow paths are fed from an upper sub and both exit through a lower sub. Both poppet valves include spring return mechanisms. Sealing of each poppet valve propagates an upstream shock wave. The lower poppet valve assembly encounters greater fluid flow and generates a larger shock wave. In the period when the upper poppet valve is closed, the lower poppet valve cannot open.

Abstract: A fastener driving apparatus comprises a gas spring or spring, a drive mechanism, an anvil assembly, and an anvil. The drive mechanism permits transition from engagement with the gas spring, spring or anvil assembly to disengagement from the gas spring, spring or anvil assembly. The anvil and/or anvil assembly are operatively coupled to the gas spring or spring such that after the drive mechanism disengages them, the gas spring piston or the spring moves to imparts a force on the anvil to cause the anvil to move and drive a fastener. The mass of the anvil assembly is preferably greater than 50% of the total mass of the anvil assembly and gas spring moving mass. The gas spring is configured such that the pressure increase during the movement of the gas spring piston by the drive mechanism is less than 30% of the initial pressure in the gas spring.

Abstract: A power tool is disclosed. The power tool has a striker, which is guided along an axis in a guide tube. A pneumatic chamber has a volume which varies with a movement of the striker. The pneumatic chamber is closed by the striker, the guide tube and a valve device. The valve device has in a flow channel a sealing element that is moveable between two positions in a bearing along the axis. The flow channel has a first cross-sectional area in a first of the two positions of the sealing element adjacent to a first mating surface of the bearing, and the flow channel has a second cross-sectional area in a second of the two positions of the sealing element adjacent to second mating surface of the bearing offset from the first mating surface along the axis. The second cross-sectional area is greater than the first cross-sectional area.

Abstract: A hammer assembly including a hammer housing and a work tool movably supported in the hammer housing is provided. A gas chamber is defined in the hammer housing and contains a compressible gas. An accumulator assembly includes an interior space. A barrier divides the interior space into a first interior portion containing a compressible gas and a second interior portion configured to receive a pressurized fluid. The barrier is configured to be movable in response to changing the amount of pressurized fluid in the second interior portion and such that movement of the barrier varies the volume of the first interior portion. The first interior portion is in communication with the gas chamber. A control valve assembly is configured for selectively placing the second interior portion of the accumulator assembly in communication with a pressurized fluid source.

Abstract: A rock drill including a first control valve (80), a first fluid circuit (70) suppliable with fluid via the first control valve (80), an impact piston (66) driveable by fluid pressure in the first fluid circuit, a plurality of first fluid circuit feedback paths (72) from the impact piston (66) to the control valve (80), a damping body (50) for damping backpressure from a rock face, a damping fluid chamber (52), associated with the damping body (50), characterised in a second fluid circuit (56) in fluid communication with the damping fluid chamber (52) and a stroke length control mechanism (91) actuable by fluid pressure in the second fluid circuit (56), wherein flow of fluid in said first fluid circuit feedback paths (72) is controllable by the stroke length control mechanism (91), whereby the driveable stroke length of said impact piston 66 may be adjusted.

Abstract: A rock drilling machine equipped with an axial bearing having at least one axial piston for setting the axial position of a drill shank and for damping stress pulses returning from the rock. The axial bearing includes a module that is detachable in one piece from one installation direction. The axial bearing module includes all necessary seals, bearing surfaces, and a module frame. Supporting forces caused by the operation of the axial bearing are transmitted of support members in the module frame directly to the body of the rock drilling machine, which is a uniform piece at least at the axial bearing.

Abstract: A rock drilling machine and an axial bearing module. The rock drilling machine is equipped with an axial bearing having at least one axial piston for axially positioning a drill shank and for damping stress pulses returning from the rock. The axial bearing includes a module that is detachable in one piece from one installation direction. The axial bearing module includes the required pressure medium channels, seals, bearing surfaces, and a module frame having at least bearing housing in connection therewith.

Abstract: An impact device is used for an electric nail gun. The electric nail gun includes a supporting frame, a flywheel disposed pivotally on the supporting frame, and a swing arm disposed pivotally on the supporting frame. The impact device includes a sliding block disposed movably on the supporting frame, a nail striker rod connected to the sliding block, and an impact block floatable on the sliding block. When the swing arm rotates toward the flywheel, it presses the impact block against the flywheel to thereby move the sliding block from a pre-firing position to a firing position. Since the impact block is not co-rotatable with the swing arm, it can be designed to move in a direction the same as that of the nail striker rod, thereby facilitating smooth firing operation.

Abstract: A power driven tool for rotating a mechanical element. The tool includes a housing and motor. The motor has an output shaft. The shaft rotates relative to the housing. The tool also includes an impact drive axially fixed within the housing. The impact drive includes a base and an anvil shaft having an anvil. The impact drive includes an annular hammer having opposite impact lands pivotally mounted on the base for movement between three positions, including a forward position in which the hammer is positioned so one impact land engages the anvil, a reverse position in which the hammer is positioned so another of the impact lands engages the anvil, and a disengaged position in which neither of the impact lands engages the anvil. Further, the tool includes a ratchet mechanism. The ratchet mechanism includes an output drive mounted for rotation relative to the housing for rotating a mechanical element.

Abstract: Power tools are taught that may include, for example, a detector for detecting impact sounds generated, e.g. by a hammer strikes an anvil or by oil pulse from an oil unit. The detector may include a receiver (30) adapted to selectively convert sound within a narrow frequency range into electric signals. Preferably, the impact sounds fall within the narrow frequency range of the receiver (30). A processor 38 may be utilized to control the motor (22) in order to stop the rotation of the hammer when a pre-determined number of impact sounds has been detected by the detector. In addition or in the alternative, various structures can be used to set various operating conditions, including dials 34, sound sensors 30, keypads and remote control devices 250. Further, structures for performing maintenance condition status checks are taught.

Abstract: A hammer mechanism is described as having a snap die, a tool chuck drive shaft, and an impact generating shutoff unit, which has a blocking element, which is provided for the purpose of preventing an axial displacement of the snap die. The blocking element acts on the snap die in parallel to at least one force of the tool chuck drive shaft, at least during a drilling operation.

Abstract: 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-spherical recess 72 formed in the crank plate 52, as a result of which the bearing 70 can be easily mounted to the recess 72. The cylindrical link member 68 is slidably disposed in a cylindrical bearing 56 formed in the end of the hollow piston 58. The crank pin 54 is therefore able to rock back and forth in the spherical recess 72 as well as slide up and down in the cylindrical bearing 56.

Abstract: A power tool and control method is disclosed. The power tool has a striker, which is guided along an axis parallel to an impact direction. A pneumatic chamber has a volume which varies with a movement of the striker along the axis. A valve device that is actuatable depending upon the movement direction of the striker connects the pneumatic chamber with an air reservoir. The valve device is actuated to open in the case of a movement of the striker in the impact direction and in the case of a movement of the striker against the impact direction is actuated to throttle or close. The throttled or closed valve device restricts an air flow flowing through it to a maximum of one tenth of the value as compared to the air flow in an opened position.

Abstract: A power tool is disclosed. The power tool has a striker, which is guided along an axis in a guide tube. A pneumatic chamber has a volume which varies with a movement of the striker. The pneumatic chamber is closed by the striker, the guide tube and a valve device. The valve device has in a flow channel a sealing element that is moveable between two positions in a bearing along the axis. The flow channel has a first cross-sectional area in a first of the two positions of the sealing element adjacent to a first mating surface of the bearing, and the flow channel has a second cross-sectional area in a second of the two positions of the sealing element adjacent to second mating surface of the bearing offset from the first mating surface along the axis. The second cross-sectional area is greater than the first cross-sectional area.

Abstract: A ballistic battering ram device that uses gun powder to produce a striking force. The ballistic battering ram includes a hollow casing, a bolt piston housing housed within the hollow casing, a bolt housed within the bolt piston housing and configured to slide back and forth, and a firing pin attached to the bolt and configured to strike the primer on the explosive casing. When the user strikes the door with the ballistic battering ram a front plate makes contact with the door pushing the bolt piston housing towards a chamber piston. Simultaneously, a retention pin timing spring pushes against a retention pin withdrawing the retention pin from inside the hollow casing. This action may allow the chamber piston to move backwards after firing which may be important for recoil management.

Abstract: A power tool having an impact mechanism including a rotary shaft defining a tool axis of rotation, an impact member moveable along the tool axis of rotation, a support member fixed in position relative to the tool axis of rotation, a biasing member for urging the impact member away from the support member, and at least one axial stop member positioned between the impact member and the support member. According to the invention, the distance between the axial stop member and the tool axis of rotation is more than the distance between the biasing member and the tool axis of rotation.

Abstract: The invention relates to an impact device, having an internal combustion engine and an impact mechanism driven by the internal combustion engine. An engine lubricating device supplies lubricant to the internal combustion engine. An impact mechanism lubricating device lubricates the impact mechanism accordingly. For this purpose, the engine lubricating device and the impact mechanism device partially comprise the same components.

Abstract: 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 a narrow frequency range into electric signals. Preferably, the impact sounds fall within the narrow frequency range of the receiver (30). A processor 38 may be utilized to control the motor (22) in order to stop the rotation of the hammer when a pre-determined number of impact sounds has been detected by the detecting means. In addition or in the alternative, various means for setting various operating conditions are taught, including dials 34, sound sensors 30, keypads and remote control devices 250. Further, means for performing maintenance condition status checks are taught.

Abstract: A valve device (V, 4?) for controlling the movement in a machine housing (2) of a reciprocating percussion piston (3) of a percussion device (1) for a rock drilling machine with a first chamber (5) that can be pressurized for forward driving of the percussion piston (3) and a second chamber (8) that can be pressurized for back-driving of the percussion piston (3), wherein the valve device includes a to and fro movable valve element (20), the movement of which being controlled as a response to the position of a valve portion (V) of the percussion piston in a valve housing portion by periodically pressurizing a signal chamber (21) actuating the movement of the valve element over signal conduit means (22, 23, 24).

Abstract: A motor driven hammer is described comprising a housing (3), a motor (9) having a motor shaft (11) and being arranged in the housing (3), a hammer mechanism including a cylinder (17) in which a ram (23) is arranged the ram being slidable along a longitudinal axis (L) of the cylinder (17), and a tool holder (15) which may support a tool bit so that the tool bit is aligned with the longitudinal axis (L) of the cylinder (17), wherein the motor (9) is coupled with the hammer mechanism, so that rotation of the motor shaft (11) results in a reciprocating movement of the ram (23) within the cylinder (17), the ram (23) applying impacts on a tool bit supported by the tool holder (15) during the reciprocating movement.

Abstract: The invention is based on a power hand tool, in particular a hammer drill and/or hammer chisel, with a percussion unit (10), which comprises a tumble bearing unit (12) with a tumble body (14) and also a piston (16). It is proposed that the power hand tool comprises at least two bearing locations (18, 20; 22, 24) arranged in parallel in the force of flux, by means of which the tumble body (14) is coupled to the piston (16).

Abstract: An impact driver for driving elongate objects into a body has, a chassis, a ram supported by the chassis in a manner allowing rectilinear movement of the ram relative to the chassis between two limits, and a linear induction motor. The linear induction motor has a stator mounted to the chassis and positioned to operatively interact with a linear induction motor reaction member being of a conductive metal material. The reaction member is carried by the ram in a manner to allow the ram to oscillate between the two limits by the stator of the linear induction motor. A first limit being a retracted position and a second limit being an impact position to which the ram is accelerated from the retracted condition by the stator and at which the ram imparts an impact force on the elongate object in the elongate direction thereof.

Abstract: A method and software product for controlling a percussion device belonging to a rock-drilling machine, and a percussion device. The impact frequency of the percussion device is set so that the percussion device forms a new compression stress wave to the tool always when reflected waves from the previous compression stress waves reach a first end of the tool. This requires that the impact frequency be set proportional to the propagation time of the stress wave, whereby the length of the used tool and the propagation velocity of the stress wave in the tool material are to be noted.

Abstract: A power driven tool for rotating a mechanical element. The tool includes a housing and motor. The motor has an output shaft. The shaft rotates relative to the housing. The tool also includes an impact drive axially fixed within the housing. The impact drive includes a base and an anvil shaft having an anvil. The impact drive includes an annular hammer having opposite impact lands pivotally mounted on the base for movement between three positions, including a forward position in which the hammer is positioned so one impact land engages the anvil, a reverse position in which the hammer is positioned so another of the impact lands engages the anvil, and a disengaged position in which neither of the impact lands engages the anvil. Further, the tool includes a ratchet mechanism. The ratchet mechanism includes an output drive mounted for rotation relative to the housing for rotating a mechanical element.

Abstract: 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 that is insertable into the hand power tool, a device that exerts pressure on the striker, by which the striker is capable of being set into a forward motion in the direction of the tool bit, a blocking element, with which the striker is blockable in its forward motion, and the striking frequency of the striker is adjustable by controlling the blocking time of the blocking element, so that the striking frequency of the striker depends on how long the blocking element blocks the forward motion of the striker.

Abstract: A portable power tool includes a housing, and an impact mechanism movably supported in the housing and having a front opening for receiving a working implement and a hammer piston for delivering hammer blows to the working implement. The impact mechanism is supported in the housing by a pivot device in a point located between the forward and rear ends of the impact mechanism and allowing longitudinal and pivotal movements but preventing in the support point radial and rotational movements of the impact mechanism relative to the housing. A resilient device is located at a distance from the pivot device and is arranged to bias the impact mechanism to a neutral position relative to the housing and to absorb vibration movements of the impact mechanism to protect the housing against such vibration movements.

Abstract: An impact tool for simultaneously providing a rotational force and an impact force to an object has an output shaft rotated by a motor, hammer for intermittently providing an impact force to the output shaft, hammer holder for movably holding the hammer, and an impact force generator for generating the impact force from an output of the motor. An air chamber is formed between the hammer and the hammer holder such that a volume of the air chamber is variable in response to a position of the hammer relative to the hammer holder. In addition, the hammer receives a bias force generated in a direction toward the output shaft by a biasing device. This bias force effectively increases the impact force in cooperation with an air pressure caused by a volume change of the air chamber.

Abstract: A method and a storage device including a software product for controlling percussive rock drilling, and further a rock drilling rig to which the method is applied. The rotation resistance is monitored, the aim being to keep it below a desired reference value. To adjust the rotation resistance, successive control actions may be carried out, such as decreasing the feed force, decreasing the percussion power and stopping the feed. Control actions are started once a limit set for the control has been exceeded. At least one limit is a time limit determining the time difference between two successive control functions.

Abstract: A valve device (V, 4?) for controlling the movement in a machine housing (2) of a reciprocating percussion piston (3) of a percussion device (1) for a rock drilling machine with a first chamber (5) that can be pressurized for forward driving of the percussion piston (3) and a second chamber (8) that can be pressurized for back-driving of the percussion piston (3), wherein the valve device includes a to and fro movable valve element (20), the movement of which being controlled as a response to the position of a valve portion (V) of the percussion piston in a valve housing portion by periodically pressurising a signal chamber (21) actuating the movement of the valve element over signal conduit means (22, 23, 24).

Abstract: 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 device (5) exerting pressure on the striker (2), as a result of which the striker can be set into a forward motion in the direction of a tool bit (4) that is insertable into the hand power tool. A blocking element (10) is also provided, with which the striker (2) is blockable in its forward motion, and the striking frequency of the striker (2) is adjustable by controlling the blocking time of the blocking element (10).

Abstract: 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 and a plurality of flexible coupling fingers. The biasable member is detachably engaged by the plurality of flexible coupling fingers in a pre-impact position and is configured to disengage the plurality of flexible coupling fingers in response to a tensile force applied across the first and second down-hole tool connectors reaching a predetermined quantity. The impactor and the impactee are configured to impact in response to the disengagement of the biasable member and the plurality of flexible coupling fingers. In one embodiment, the impact jar may be employed in either of e-line and slickline applications.

Abstract: 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 manually controlled by the operating element (4) of the manually control switch (3), the sensor switch (5) being connected with the carrier (6) vibration-free, and pivot transmitting device (7) axially displaceable along the vibration axis A) of a vibrating assembly (2) of the power tool relative to the operating element (4) for pivoting the carrier (6) in response to actuation of the operating element (4).

Abstract: 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 given point in time, the drill bit is hammered in the first or second direction.

Abstract: 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 be integral with the anvil(8). At the rear of the first cam(29), a second cam(31) having cam gears(32, 32 . . . ) and further having cam gears(36, 36 . . . ) at its outer circumference is externally provided to the anvil(8) so as to be rotatable. At the backward position of the anvil(8), the cam gears(30, 32) contacts with each other. On the other hand, in the cylindrical portion(27) of the hammer case(5), an engaging pin(37) capable of engaging with an engaging gear(36) of the second cam(31) is provided. The engaging pin(37) can change its location by the rotative operation of a mode-change ring(40), whereby a percussion mode and a non-percussion mode is selected.

Abstract: 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 arranged to transmit impact energy generated by the percussion device (4) as a compression stress wave to the bit. The feed device (9) is arranged to thrust the tool (7) and the bit (8) against the rock to be drilled, whereby on drilling at least part of the compression stress wave generated by the percussion device (4) to the tool (7) reflects from the rock to be drilled back to the tool (7) as tensile stress, and impact energy of the percussion device (4) is adjusted on the basis of the level of tensile stress (?v) reflecting from the rock.

Abstract: 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 and a plurality of flexible coupling fingers. The biasable member is detachably engaged by the plurality of flexible coupling fingers in a pre-impact position and is configured to disengage the plurality of flexible coupling fingers in response to a tensile force applied across the first and second down-hole tool connectors reaching a predetermined quantity. The impactor and the impactee are configured to impact in response to the disengagement of the biasable member and the plurality of flexible coupling fingers. In one embodiment, the impact jar may be employed in either of e-line and slickline applications.

Abstract: 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 for condensing mercury-free paste in the cavity. The impactor provides periodic impulses by activating the solenoid, causing the hammer to strike the anvil. The anvil is forced into contact with the paste, thereby condensing the paste into a high-density metal or other material suitable for dental restoration. (Also disclosed is a solenoid or other transducer having a “T” shaped hammer which strikes an anvil.) The solenoid or other transducer can be used to compact or strike any surface. The paste feeder may be incorporated into the impactor or alternatively be a separate hand operated device.

Abstract: 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 by the hammer cylinder mounted to a closed end of the hammer channel. The hammer cylinder and its associated plumbing is of sufficient size to function as a hydraulic reservoir for the post driving implement, thus eliminating the need for a third hydraulic line to the reservoir on the vehicle and to avoiding need for alteration of the vehicle's reservoir. The post driving implement of the present invention may also include a back plate for mounting the implement to a vehicle. Additionally, the post driving implement may include adjustment mechanisms to vary the positional and angular relationship between the vehicle and the implement.

Abstract: 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 arranged in the center of an exciting coil (4) to which a pulse voltage is applied, a rod (12) is arranged in tight contact with the front end of the super magnetostrictive material (1), a reaction-receiving plate (3) is provided in tight contact with the other end of the super magnetostrictive material (1), and a power unit (6) is provided for repeatedly applying a pulse voltage to the exciting coil (4).

Abstract: 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 of the support tower. The engine transfers torque to the transmission mounted below the engine, to which a steel swivel, housing a quill, allows passage of air and/or water to a drill steel to provide rotary force to power a drill bit. A pull-down system, preferably a weighted bar, is attached to the lower end of the support tower and to the drilling engine to pull the drilling ending downwardly. Manual transport is provided by means of a main base wheel dolly system for easy one-man mobilization. A counterweight is attached to the lower end of the support tower to prevent the support tower from being lifted as the pull-down system forces the drilling bit into the ground.

Abstract: 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 hydraulic cylinder pushes one set of pulleys upwardly away from another set with the upper set of pulleys including five pulleys and the lower set including four pulleys to provide a multiplication factor. The end of the cable opposite the end attached to the weight is attached to the movable pulleys, all of which are mounted at an elevation higher than the fixed pulleys so that the pulley assembly, the attached cable end, the hydraulic cylinder ram and piston, and the weight fall downwardly under the force of gravity.