Abstract: A drill tool is provided with: a drive source accommodated in a tool body 2; a bit drive shaft 3 which is rotation-driven by the drive source and provided projectingly from a front end of the drill body 2; and a diamond bit 4 attached to a front end of the bit drive shaft 3. Further, the drill tool is provided with a vibrating apparatus which generates vibrating force which acts in the axial direction of the bit drive shaft 3, a magnitude of which pulsates, and vibrating moment which acts in the rotational direction of the bit drive shaft 3, a magnitude of which pulsates.

Abstract: A vibration generator for a vibration pile driver has imbalance masses that can rotate and which are disposed on shafts. The rotational position of the imbalance masses can be adjusted relative to one another. A control and regulation circuit is provided, which has the following components: a memory unit for storing ground composition data sets or task-specific default data sets with defined operational characteristic variables; sensors for continuous detection of the defined operational characteristic variables; an evaluation unit for comparing the operational characteristic variables that are determined with the operational characteristic variables of the selected default data set; a regulation device for regulating the vibration generator; and a control device for controlling the means for adjusting the rotational position of the imbalance masses relative to one another. The vibration generator is part of a vibration pile driver.

Abstract: A vibration generator for a vibration pile driver, comprises imbalance masses that can rotate, which are disposed on shafts. A hydraulic drive having a changeable suction volume is disposed on the generator. A vibration pile driver consists of the vibration generator and a mast for movably supporting the vibration generator and/or an accommodation for a pile-driven material.

Abstract: A hand-held power tool includes a motor-driven percussion mechanism including a guide tube (21), a reciprocating driving member (22) displaceable in the guide tube (21) for driving, via a gas spring, an impact member (23) likewise displaceable in the guide tube (21) a motor-driven eccentric wheel (17) rotatable about an axis (D) which is spaced from the percussion mechanism axis (S) in a direction perpendicular to the percussion mechanism axis (S) by a distance (X), and a connection rod (29) eccentrically supported on the eccentric wheel (17) and connected to the driving member (22) for converting a rotational movement of the eccentric wheel (17) into a reciprocating movement of the driving member (22).

Abstract: The resonator assembly for a power toothbrush includes an elongated solid rod made from stainless steel, having a back assembly which includes permanent magnets which interact with an electromagnet in a drive system in the handle of the toothbrush to produce a transverse motion of the rod. A mount member is connected to the rod at a selected point along its length, and is mounted to a toothbrush housing so that the rod resonates about the mount member at a selected frequency.

Abstract: A striking device of a power tool includes a striking room, two striking blocks and a transmission shaft. The striking room has a pivotal restricting groove at its two sides respectively, and two supporting surfaces formed adjacent to two sides of the pivotal restricting groove. Each striking block has a projected pivot formed axially, pivotally installed between two pin holes of the striking room via two pins. Two sides of the projected pivot are extended with striking portions, and the transmission shaft has two restricting blocks provided with a struck segment and a displacing segment. When one of the striking portion strikes one of the struck segments, the other of the striking portions just leans on the supporting surface to activate the transmission shaft to rotate. When the striking portion moves away after striking, it passes through the corresponding displacing segment to carry out next strike.

Abstract: An apparatus and method for continuously preloading during installation and removal of steel sheet piles, steel pilings, and casing piles, with a telescoping, articulated boom having a free end for creating the downward driving force, a weighted base to provide support and stability for the boom, a connector at the free end of said boom to engage the piling, a modified resonance-free vibratory hammer, to allow for simultaneously vibrating the piling while applying to the piling the continuous downward or upward force.

Abstract: A drill tool is provided with: a drive source accommodated in a tool body 2; a bit drive shaft 3 which is rotation-driven by the drive source and provided projectingly from a front end of the drill body 2; and a diamond bit 4 attached to a front end of the bit drive shaft 3. Further, the drill tool is provided with a vibrating apparatus which generates vibrating force which acts in the axial direction of the bit drive shaft 3, a magnitude of which pulsates, and vibrating moment which acts in the rotational direction of the bit drive shaft 3, a magnitude of which pulsates.

Abstract: A drive system for driving and/or extracting an elongate member. The drive system comprises a piston drive assembly, a hydraulic system, and a vibration drive assembly. The piston drive assembly comprises a piston member, and the piston member engages the elongate member. The hydraulic system is operatively connected to the piston drive assembly to apply a drive force to the piston member. The vibration drive assembly generates a vibratory force. The vibration drive assembly is operatively connected to the piston drive assembly. The drive system operates in a first mode in which the drive force and the vibratory force are applied to the piston member along a drive axis.

Abstract: A hand-held tool having a motor, a vibration mechanism, and a stake-gripping device is disclosed for driving and extracting stakes or posts. The vibration mechanism generally comprises a housing surrounding a pair of geared eccentric plates or geared weighted plates that are rotated by the motor. The stake-gripping device is attached to the vibration mechanism so that vibrations are transferred into a stake or post through the device housing. Internally, the stake-gripping device comprises a pair of toothed plates with at least one of the plates mounted to the housing utilizing springs. The spring mounted plate has an attached wire connected to a handle. As the handle is grasped, the wire pulls the stake-gripping device into the open position allowing placement of a stake or post into the device. When the handle is released, the toothed plate squeezes the stake or post inside the housing.

Abstract: A gear wheel is rotatably mounted on a drive shaft. The drive shaft has a plurality of longitudinal splines formed thereon. A drive sleeve surrounds the drive shaft and has a plurality of the inner splines formed on its interior surface. The inner splines slidably intermesh with outer splines of the drive shaft such that the drive sleeve can slide up and down on but cannot rotate relative to the drive shaft. A coil spring biases the drive sleeve downwardly. Drive sleeve teeth are formed around the bottom edge of the drive sleeve. Corresponding gear plate teeth are formed on the upper surface of the gear wheel and are adapted to engage the drive sleeve teeth when the drive sleeve is in its downward most position under the influence of the coil spring. In this position, the gear wheel is operatively coupled to the drive shaft.

Abstract: The present invention is a method for removing an obsolete drill platform that includes a body having a plurality of caissons embedded in a ground of an ocean or inland sea. The method includes the steps of vibrating at least one of the caissons, and lifting the at least one caisson from the ground while it is still being vibrated. The present invention is further directed to a method for installing a caisson on a floor of an ocean or inland. The method includes the steps of placing an end of the caisson on the floor, vibrating the caisson and forcing a portion of the caisson into the floor.

Abstract: A system for active dynamic balancing of a rotating tool driven by a motor having a shaft supported by a first and second bearing on opposing sides of the motor includes an acceleration sensing assembly configured to sense radial accelerations on the shaft producing an acceleration signal indicative of the radial accelerations. A correcting mass assembly is configured to rotate with the shaft and to move at least one mass radially to the shaft responsive to a correcting signal. A controller is configured to receive the acceleration signal generating a correcting signal by means of a closed loop iterative algorithm.

Abstract: A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) contained in the main body (1) in which the main body (1) is provided with a vibrating apparatus (8) for exerting a vibrating force a magnitude which is pulsated to change along the bit drive shaft (4) to the main body (1).

Abstract: A drive for a motor-driven hand-held tool includes a motor (17) and a gear mechanism (20) for converting a rotational movement of the motor (17) into a reciprocating movement of the reciprocating drive element (30) for a working tool, with the gear mechanism (20) having a transmission element (23) axially secured on a support (21) with a support member (26) and including a mass-balance member (31), a first eccentric take-off element (24) cooperating with the reciprocating drive element (30) and a second eccentric take-off element (25) cooperating with the mass-balance member (31) for imparting reciprocating movement thereto, and with the support member (26) forming a slide support surface for the mass-balance member (31).

Abstract: The invention concerns a hand-operated working device such as, for example, vibrating plates and vibrating rollers for soil compaction with a guide lever that is arranged on the working device such that it is vibratory damped, can be adjusted in its working height, and can be folded and fixed in a transport position. It has an elastic damping element on each of the four junctures distributed in the arrangement. All four damping elements are connected on the side turned away from the device to a console. The guide lever is arranged on the console.

Abstract: The present invention may be embodied as an eccentric vibration system comprising a major eccentric member, a minor eccentric member, first and second motor assemblies, and a transmission system. The transmission system operates in a first mode when a torque of the first motor assembly is less than a torque of the second motor assembly and in a second mode when the torque of the first motor assembly is greater than the torque of the second motor assembly. When the transmission system operates in the first mode, longitudinal vibratory forces generated by the major eccentric member substantially cancel longitudinal vibratory forces generated by the minor eccentric member. When the transmission system operates in the second mode, longitudinal vibratory forces generated by the major eccentric member are added to longitudinal vibratory forces generated by the minor eccentric member.

Abstract: The invention relates to vibration generator for a soil compacting device referred to as a towed vibrating device. The vibration generator has two parallels arranged unbalanced shafts that each support a fixed and a freely rotating unbalanced mass. An unbalance adjusting device enables the position of both freely rotating unbalanced masses to be adjusted in such a manner that, during a maximum unbalance action of one of the unbalanced shafts, the unbalance action on the other unbalanced shaft is minimized. The unbalance adjusting device can alter the position of the unbalanced masses whereby rendering possible a to-and-fro movement of the soil compacting device or a compaction when stationary.

Abstract: A power tool (10) with a housing (12) which accommodates a driven shaft (32) for holding a material-removing tool (40) and which sets the driven shaft into rotary oscillating motion capable of being produced by an eccentric (22) rotating around an axis extending at a right angle to the driven shaft (32), the eccentric engaging in a connecting element coupled with the driven shaft (32), is usable in a more diverse manner because the rotary oscillating motion of the driven shaft (32) and, therefore, the tool (40), is adjustable with a certain travel and is therefore adaptable to special applications.

Abstract: A system for active dynamic balancing of a rotating tool driven by a motor having a shaft supported by a first and second bearing on opposing sides of the motor includes an acceleration sensing assembly configured to sense radial accelerations on the shaft producing an acceleration signal indicative of the radial accelerations. A correcting mass assembly is configured to rotate with the shaft and to move at least one mass radially to the shaft responsive to a correcting signal. A controller is configured to receive the acceleration signal generating a correcting signal by means of a closed loop iterative algorithm.

Abstract: A jackhammer system for reducing the vibration and noise experienced by an operator of the jackhammer. The jackhammer system includes a housing, a chisel movably positioned within a lower neck of the housing, a pair of flywheels rotatably attached to a pair of support brackets, a ram slidably positioned within a guide channel and engageable by the flywheels to engage the chisel, a plurality of elastic members attached to the ram, and an actuator mechanically connected to the support brackets for controlling a position of the flywheels. An upper sensor and a lower sensor determine the position of the ram within the guide channel. An engaging plate supported by a plurality of compression springs receives the downwardly impact of the ram when driving the chisel downwardly. A recoil absorber having a recoil spring is attached to an upper portion of the housing for absorbing the recoil of the ram.

Abstract: 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 speed of the vibrating plate and its direction of travel. The inventive vibration plate is characterized in that the unbalanced masses disposed on a common shaft can be adjusted independent of external forces and torques since the adjustment piston adjusting the unbalanced masses is braced in the adjustment cylinder to a much higher degree than would be possible with conventional coil springs. To this end, every adjustable unbalanced mass is associated with a double-action hydraulic cylinder that comprises two liquid chambers. The connection of said chambers to a storage and a pump can be locked in order to fix the piston which can be adjusted within the hydraulic cylinder.

Abstract: The invention is based on a hand power tool, having a drive shaft (12, 14) supported in the housing (10) and having a mechanical percussion mechanism (16, 18, 20, 22, 24), which has a striker (26, 28) that is driven in hammering fashion via a driver unit (32, 34) supported on an intermediate shaft (30), which driver unit has at least one curve element (36, 38) by way of which at least one transmission unit (40, 42, 44, 46) with a tracer member is movable. It is proposed that the curve element (36, 38) has at least one first and at least one second curved path segment (56, 58, 60, 62), the first curved path segment acting in a first axial direction of the intermediate shaft (30) and the second curved path segment acting in a second axial direction of the intermediate shaft (30).

Abstract: The invention relates to a controller for an unbalanced mass adjusting unit in a vibration exciter. Said controller comprises an adjusting piston for changing the relative position of unbalanced masses in the vibration exciter that is coupled to a reference piston. The position of a piston rod of the reference piston is detected by a pressure sensor and is furnished to a controller in the form of a position signal. The controller compares the position signal with an operating signal given by an operator and generates a control signal with which the position of a selector valve that controls the oil supply to or the oil discharge from the reference piston can be changed.

Abstract: The invention relates to a demolition hammer and/or hammer drill comprising a percussion generating device having a percussion piston moving axially back and forth. In a main percussion mode, the percussion piston impinges upon a tool which can move along a limited axial path straight into a main percussion direction. In a free percussion mode, the percussion piston indirectly impinges upon a percussion changing device, and by means thereof upon the tool, in a free percussion direction opposite to the main percussion direction. The impact surface of a tool shaft and the impact surface of a free percussion ram are placed opposite an impact surface of the percussion piston in such a way that the free percussion ram is removed from the effective area of the percussion piston by a return spring in the main percussion position.

Abstract: An electronic control module provides dual insulation layers between an internal line voltage and a separate tool housing that serves as a heat sink, thereby allowing versatility in mounting the electronic control module within the tool housing interior, and thereby also eliminating the risk of electrical shock to a user making contact with an exterior tool housing surface. The control module includes a power device, connected to a line voltage, and a thermal pad. The power device provides a first layer of electrical insulation between the line voltage and an external tab of the power device while the thermal pad provides a second layer of electrical insulation. The combined first and second layers provide a minimum amount of electrical insulation between the line voltage and the tool housing thereby preventing electrical shock. Alternatively, the thermal pad is provided between the control module and the tool housing.

Abstract: It is, accordingly, an object of the present invention to provide an electric hammer with improved construction, while ensuring the vibration reduction performance. According to the present invention, a representative electric hammer may include a hammer bit, a driving motor, a crank mechanism and a counter weight. The crank mechanism drives a striker by converting a rotating output of the driving motor to linear motion in the axial direction of the hammer bit. The counter weight is detachably mounted to the crank mechanism and serves to reduce vibration of the striker. According to the representative hammer, because the counter weight is detachably mounted to the crank mechanism, it is possible to switch between the mode in which the counter weight is mounted on the hammer body in order to reduce and alleviate vibration and the mode in which the counter weight is removed from the hammer so that the operation can be performed with the hammer having a lighter weight and slimmer appearance.

Abstract: The invention concerns a device for displacing a load (14) comprising a mobile support (12) adapted to support a load and exert on the load a force in a given direction, and device for mechanical balancing (10) interposed between the mobile support (12) and the load (14) so as to compensate the weight of the load and allow movements of slight amplitude of the load in a direction parallel to the load. The device is particularly useful for manoeuvring stakes, such as sheet piles and the like. The balancing device (10) can alternatively be integrated between the mobile support (12) and a vibration generator (46) to isolate the support from the vibrations generated by the vibration generator.

Abstract: The inventive rotary percussion device (1) used for driving at least one drill column (2) disposes of a percussion device (6) and a rotary device (5) and of an insertion end (3), which is rotatably mounted in a device body (8) and which has an axial boring, in which a percussion piston (4) is displaceably mounted. The insertion end (3), which is connected to the drill column (2) by a connection piece (33), is driven by the rotary device (5), and the percussion piston (4) mounted in the insertion end (3) is driven independently thereof by the percussion device (6). The percussion energy transmitted to the drill column (2) via the percussion piston (4) has, as a result, largely reduced influences upon the insertion end (3) that, according to the invention, is decoupled from the percussion device (5) so that premature material fatigue is prevented. In addition, the noise emissions occurring during the operation of the inventive rotary percussion device (1) are largely reduced.

Abstract: A device and method for performing a task employing vibration of a tool. The device includes a housing containing at least one off-center weight, and the off-center weight is coupled to a motor and configured to rotate or revolve to vibrate the housing. The housing further includes a device mount to allow the housing to be removably coupled to a mount on a vehicle. A tool is removably coupled to the housing via a socket on the housing to perform a task. The housing may be coupled to a plurality of types of vehicles and is such that a plurality of types of tools may be coupled to the housing.

Abstract: Disclosed herein is a device for driving a post into the ground that has: a mounting assembly for mounting the device onto a support vehicle; a mast assembly connected to the mounting assembly and a driving assembly slidably connected to the mast to slide axially thereon. The driving assembly has a vibrator and a support cup operatively connected to the vibrator that is capable of receiving an end of the post. The device drives a post into the ground by the application of vibratory and constant downward force onto the post. This invention also discloses a method of driving a post into the ground. The device of this invention is robust, sturdy and easy to use and repair.

Abstract: A sonic drilling head includes a spindle which is both rotated and vibrated at sonic frequency to effect ground penetration of members such as drill rods, etc. Two pairs of rotating eccentric masses are mounted in a sine generator housing. The pairs of masses have intersecting axis. A spiral bevel gear and drive shaft rotate the first pair of masses which engage the second pair of masses so that the pairs of masses are driven in opposite directions. Rotation is imparted to the spindle through a geared bearing isolated by a pack of precision disc springs, which also cooperate with a second set of precision disc springs to isolate the vibrations of the rotating eccentric masses from an outer housing of the sonic drill head.

Abstract: A motor driven hammer comprising a tool holder and an air cushion hammering mechanism including a piston and a beat piece slideably located in a cylinder wherein reciprocation of the piston in the cylinder will cause the beat piece to hit a tool located in the tool holder, and further comprising an eccentric mass mounted for rotation about the axis of the cylinder and rotatingly driven by the motor via a gear arrangement so as to cause the bit mounted in the tool holder to be laterally diverted.

Abstract: An electronic control module provides dual insulation layers between an internal line voltage and a separate tool housing that serves as a heat sink, thereby allowing versatility in mounting the electronic control module within the tool housing interior, and thereby also eliminating the risk of electrical shock to a user making contact with an exterior tool housing surface. The control module includes a power device, connected to a line voltage, and a thermal pad. The power device provides a first layer of electrical insulation between the line voltage and an external tab of the power device while the thermal pad provides a second layer of electrical insulation. The combined first and second layers provide a minimum amount of electrical insulation between the line voltage and the tool housing thereby preventing electrical shock. Alternatively, the thermal pad is provided between the control module and the tool housing.

Abstract: A device and method for performing a task employing vibration of a tool. The device includes a housing containing at least one off-center weight, and the off-center weight is coupled to a motor and configured to rotate or revolve to vibrate the housing. The housing further includes a device mount to allow the housing to be removably coupled to a mount on a vehicle. A tool is removably coupled to the housing via a socket on the housing to perform a task. The housing may be coupled to a plurality of types of vehicles and is such that a plurality of types of tools may be coupled to the housing.

Abstract: A device for use in combination with a pile driving apparatus for driving piles into the ground. The device (1) including a main body (13) which carries side grippers (18) and (19) each of which comprises a ram consisting of a piston and cylinder (20). A further gripper (23) is included, which extends downwardly of the main body (13) which grips the lower end of a pile, while grippers (18) and (19) are used to pick up and position a pile. A vibratory force generator (16) is operated to cause the main body (13) to vibrate thereby applying a downward vibrating force to the main body (13) and the pile held by the grippers (18, 19, 23), so driving the pile into the ground.

Abstract: The invention concerns a device for displacing a load (14) comprising a mobile support (12) adapted to support a load and exert on said load a force in a given direction, and means for mechanical balancing (10) interposed between the mobile support (12) and the load (14) so as to compensate the weight of the load and allow movements of slight amplitude of the load in a direction parallel to the load. The device is particularly useful for manoeuvring stakes, such as sheet piles and the like. The balancing means (10) can alternatively be integrated between the mobile support (12) and a vibration generator (46) to isolate said support from the vibrations generated by the vibration generator.

Abstract: A system for driving a large diameter caisson into the ground, comprising a crane assembly, a plurality of vibratory devices, a clamp assembly, a suspension assembly, and a timing system. Each vibratory device generates a vibratory force. The clamp assembly rigidly secures each of the vibratory devices to one of a plurality of predetermined angularly spaced locations about the caisson. The suspension assembly connects the vibratory devices to the crane assembly such that transmission of vibratory forces from the vibratory devices to the crane assembly is inhibited. The timing system operatively connects the plurality of vibratory devices to synchronize the vibratory forces generated thereby.

Abstract: A pneumatic power cutting tool is constructed to include an eccentric shaft, the eccentric transmission shaft having a first eccentric shaft and a second eccentric shaft eccentrically forwardly extended from the first eccentric shaft and adapted for reciprocating a cutter blade to cut the workpiece, a sliding block coupled to the first eccentric shaft by coupling means and adapted for sliding in a longitudinal sliding way in reverse to the reciprocation of the cutter blade to balance the centrifugal force due to the reciprocating motion of the cutter blade with the second eccentric shaft and to reduce the production of vibration and noise.

Abstract: In order to avoid the recoil of the striker in a hammer device (tool machine) with a striker (18) that can be accelerated to strike velocity, and a tool carrier (14) receiving the impact of said striker, the invention proposes to arrange the striker (18) between the tool carrier (14) and a corresponding mass carrier (16) which moves together with the striker (18) until the striker (18) strikes the tool carrier (14), imparting its own momentum via the striker to the tool carrier, with a supplementary mass (56) on the mass carrier (16) providing the necessary striking energy.

Abstract: A device and method to convert ordinary rotary motion of input frequency &OHgr; into a composite motion with the same primary frequency &OHgr; plus an eccentric motion at a higher frequency &ohgr; enables a low speed rotary input to drive a higher-speed eccentric motion. A preferred embodiment enables an existing rotary motion machine (7) to be easily adapted to provide compound rotary and eccentric motion. Optional attachments are used to collect waste products generated by rotary motion machine (7).

Abstract: A device and method for performing a task employing vibration of a tool. The device includes a housing containing at least one off-center weight, and the off-center weight is coupled to a motor and configured to rotate or revolve to vibrate the housing. The housing further includes a device mount to allow the housing to be removably coupled to a mount on a vehicle. A tool is removably coupled to the housing via a socket on the housing to perform a task. The housing may be coupled to a plurality of types of vehicles and is such that a plurality of types of tools may be coupled to the housing.

Abstract: A device for driving an object by vibration, in particular a pile or sheet piling to be driven into the ground be removed therefrom, which device comprises a first eccentrically rotatable weight (1, 2) and a second eccentrically rotatable weight (3, 4), which weights are interconnected by a phase shifter (13) which is capable of adjusting the rotational position of the weights (1, 2; 3, 4) relative to each other. The phase shifter (13) comprises a differential.

Abstract: An impacting apparatus and a vehicle having such an apparatus, the apparatus having a mounting portion securable to the vehicle, a tool support portion pivotally connected adjacent a first edge of the tool support portion to the mounting portion via a pivotal connection and flexibly connected at a second edge of the tool support portion to the mounting portion via a flexible connection remote from the pivotal connection, vibration means mounted between the mounting portion and the tool support portion for reciprocating the tool support portion relative the mounting portion via the flexible connection and a tool extending from the tool support portion. The flexible connection comprises resilient elements held by a fastening means between end plates. The fastening means has tightening means for adjusting the flexible connection to a predetermined compression setting of the resilient elements.

Abstract: An electrical hand-held power tool including an arrangement for actively damping vibrations applied to the tool handle (2) and arranged between the handle and the hammer mechanism module (3) with a possibility of a limited axial displacement along the percussion axis (A) with respect to the hammer mechanism module (3) and having at least one electromechanical actuator (5a, 5b) surrounded by an elastic spring (8a, 8b), a sensor for sensing vibrations acting on the handle (2), and a microprocessor (7) for dynamically controlling the actuator (5a, 5b) in accordance with the signal generated by the sensor.

Abstract: A coupler assembly (46, 48) is suspended from a forward section (12) of a boom (14) that projects from a mobile base (18). An upper end portion (160) of a pipe piling (P) is gripped by a pair of clamp jaws (148, 150). The clamp jaws (148, 150) are movable together and apart and they are mounted for rotation around a common axis. This allows an end portion (160) of a pipe piling (P) to be gripped by the clamp jaws (148, 150) while the pipe piling (P) is in a substantially horizontal or some other non vertical position. Then, the coupler assembly (46, 48) can be lifted to lift the gripped end portion (160) of the pipe piling (P) upwardly. As end portion (160) moves upwardly, the clamp jaws (148, 150) will rotate in position so as to enable the pipe piling (P) to swing upwardly while its lower end is on a support surface. The rotation of the clamp jaws (148, 150) will continue until the pipe piling (P) is suspended from the lifting boom section (12) and is in a substantially vertical orientation.

Abstract: A split tool tamper having a motor, a frame, a single tool shaft, and a tamping tool. The motor is coupled to the frame and the tool shaft is coupled to the motor. The tool shaft is further coupled to a single tamping tool.

Abstract: A device for transmitting and distributing vibration and stress exerted by a vibrator on objects to be driven into the ground includes a supporting plate of repartition of vibrations bolted on a sole plate of the vibrator having dimensions lower to that of the supporting plate. A “I” shaped profiled rail is on its entire length on the supporting movable plate supporting movable hydraulic clamps.

Abstract: An impacting device is capable of being used in an impact hammer and/or a drill for releasing by impact tools blocked in rocks. An impact impetus supplied by an impact piston is modified via an impact-deflecting device having a sliding lever and a deflecting lever, such that the impact is carried out in a releasing impact direction opposite the normal impact direction and is transmitted to a tool by a slide and a locking lever. The tool is released after a few strokes produced by the impact piston. The impact device is suitable for both unilateral air springs and double air springs.

Abstract: A vibratory apparatus, useful with a vibrated plow, cable layer or the like, includes a housing and a shaft mounted to the housing for rotation about a shaft axis. Counterrevolving first and second eccentric weights are supported by the shaft for rotation about such axis. A drive gear is fixed with respect to the shaft and another drive gear is fixed with respect to the second weight. A transition gear engages both drive gears for counter-rotation of the weights about the same axis of rotation. Most preferably, the weights are configured to “interdigitate” as the shaft and weights rotate. That is, as the weights rotate in opposite directions, the first weight passes through a cavity in the second weight. The drive gears and the transition gear are preferably bevel gears and form what might be termed a differential gear set.