Abstract: A vibratory drill head for use with a drill stand apparatus. The eccentric cams are mounted on parallel drive shafts which are powered by hydraulic motors. The hydraulic motors cause the drive shafts to spin in opposite directions. The counter-rotating eccentric cams eliminate horizontal vibration and maximize vertical vibration. The vibratory drill head is mounted to a drill shaft such as a sample tube. When the vibrating drill shaft is lowered into the soil, the vibrations allow the sample tube to pierce the soil to collect the sample. The minimization of horizontal vibration produces accurate core samples.

Abstract: An adjusting device for an unbalance vibrator with adjustable centrifugal moment. The invention concerns specifically the specialised category of vibrators in which each unbalance shaft has its own motor (110, 112, 114, 116) and no transmission system is provided for connecting the minimum of four unbalance shafts. A novel way of hydraulically actuating the motors is described for ram vibrators of this type provided with four hydraulic motors (110, 112, 114, 116). This involves connecting two motors (the ones allocated to the two unbalance shafts which always rotate synchronously counter to one another even during adjustment) in parallel to their own respective hydraulic circuits. Each of the two hydraulic circuits (118, 120) has its own pump (P1, P2) and the pressures in the forward flow and/or back flow lines can be adjusted independently from the outside by a control and regulation device (126, 128) in such a way that they can be used to set the centifugal moment in a predeternmined manner.

Abstract: Supporting clamps for a tool such as, for example, a pile driver machine are used to tilt a machine support relative to a horizontal plane. The clamps include a pair of jaw elements one of which is received on a pivot and the other of which has a pair of parallel spaced pistons. The clamp jaw elements gird a fixed reference device to support the tool securely for subsequent operations. Different pressures applied to the two pistons causes the clamp to tilt about the fixed reference device, and thereby to tilt the tool to which it is attached. The difference in pressure is controlled to rotate the tool as desired. In a second embodiment of the invention, the desired angle is established by controlling an angle of a backup surface, and applying equal pressure to the two pistons. The fixed reference device is driven into the angled backup surface to establish the desired tilt angle. In a further embodiment, one piston is disposed at each side of the gap. The two pistons are spaced apart along the gap.

Abstract: A vibration tamper for soil compacting has a guide handle proceeding from the tamper head, which is pivoted elastically on the tamper. At the same time, the handle has a special mass distribution with regard to its pivot point.

Abstract: A vibratory hammer for use in driving a work piece such as a pile, pipe, caisson or plate into the earth includes a support frame 10 adapted to be suspended from a crane or the like, and a vibrator assembly 12 that is suspended from the frame. The vibrator assembly includes at least one pair of laterally spaced, parallel rotary shafts 40 that are rotatable in opposite directions to one another, and a weight 46 is supported on each shaft. Each weight is shiftable radially relative to the corresponding shaft between a balanced position in which the center of mass of the weight is collinear with the longitudinal axis of the shaft, and an eccentric position in which the center of mass of the weight is offset radially from the longitudinal axis of the shaft. Preferably, a fluid-actuated piston-and-cylinder assembly 54 is supported between each weight and the corresponding shaft for selectively carrying out the shifting movement of the weights. However, other types of shifting mechanisms could also be employed.

Abstract: An unbalanced-mass vibrator comprises a pair of unbalanced masses which are sequentially driven in opposite rotational directions. The vibrators are intended to provide vibrations in a vibrational direction, and undesired vibrations transverse to the vibrational direction are reduced or eliminated. In particular, mechanisms in control schemes are provided for adjusting the relative torques delivered to each of the unbalanced masses via hydraulic motors. The torques, in turn, may be controlled based on the degree to which the unbalanced masses are out of synchronization or by measurically measuring vibrations in a transverse direction to the desired vibrational direction, or time derivative thereof.

Abstract: The invention relates to a vibrating hammer, more particularly for driving sheet piles into the ground, the hammer having a lower side with a number of parallel horizontal guide tracks, slide blocks being mounted for adjustment along the tracks, the blocks having each a pair of clamping jaws adapted to grip a sheet pile, the clamping faces of the clamping jaws extending at right angles to the longitudinal direction of the guide tracks. According to the invention, the pairs of clamping jaws take such a position on the sliding blocks engaging the guide tracks that the center lines of the clamping jaws lie laterally offset relative to the longitudinal axis of the respective sliding blocks.

Abstract: A vibration generator for generating directed vibrations in a compacting device includes a housing and a first and second flyweight shafts rotatably supported in the housing and extending parallel at a distance to one another. The flyweight shafts have a respective flyweight connected thereto. A first and second intermediate shafts are rotatably supported in the housing and extend parallel to and between the first and second flyweight shafts. Gear wheels positive-lockingly connect the first and second intermediate shafts to one another, the first intermediate shaft to the first flyweight shaft, and the second intermediate shaft to the second flyweight shaft. In this manner, the first intermediate shaft and the first flyweight shaft, respectively, the second intermediate shaft and the second flyweight shaft rotate in opposite directions. One of the intermediate shafts has connected thereto two gear wheels, with one being coupled to the first flyweight shaft and another coupled to the second flyweight shaft.

Abstract: A system for allowing elongate members such as piles, caissons, and casings to be driven into the earth at inaccessible locations. The system comprises a structural assembly having a support assembly and a bracing assembly. The structural assembly is arranged on a ground engaging assembly. The bracing assembly engages the caisson as it is being driven to make sure that it is plumb as it is being driven and when it is subsequently in the earth. The ground engaging assembly is adjustable to alter the orientation of the structural assembly to maintain the caisson in a plumb orientation. The bracing assembly comprises a guide portion and an extension portion. The extension portion may be retracted and extended relative to the support assembly. The system employs a conventional vibratory hammer to drive the elongate member. The system may also include a helicopter to lift the various components and the elongate member to the desired location.

Abstract: A motor driven eccentric vibrator with a spring isolated biasing mass for applying force to an earth penetrating device to cause the device to penetrate into the earth. The vibrator is rigidly attached to a housing which is rigidly attached to the earth penetrating element, which may be a sampling/core tube, while the biasing mass is suspended from the housing by a suspension that allows relative motion between the housing and the biasing mass in a vertical direction parallel to the longitudinal axis of the earth penetrating element. The biasing mass serves to apply a down force on the housing while not significantly reducing the amplitude of the vibrational displacement of the housing in a vertical direction. This mass also reduces the vibrational displacement of the housing in a horizontal direction caused by a single eccentric vibrator.

Abstract: A vibration exciter machine has magneto striction elements (5,6) supported by a driven pile (2), for providing a vibration of up and down direction to the driven pile (2), and a drive circuit (D1) for controlling expansion and contraction movement of the magneto striction elements (5,6) by changing a supply time period of a current supplied to the magneto striction elements (5,6). By controlling of the drive circuit (D1) the supply time period of the current which flows in the magneto striction elements (5,6) is changed to control the expansion and contraction movement of the elements (5,7). Thereby a horizontal vibration component can be eliminated and only vertical vibration component can be transmitted to the driven pile material (2).

Abstract: An apparatus for attaching a caisson to a device for inserting and/or extracting the caisson. The apparatus comprises three beams. A first beam is relatively long and is normally connected to a vibratory device such that its longitudinal axis is orthogonal to the lengthwise axis of the vibratory device. The second and third beams are relatively short and are connected to the vibratory device such their longitudinal axes are parallel to the lengthwise axis of the vibratory device. Four clamps are mounted on the beams to fix the beams onto the caisson. A flange on the first beam is widened at least a middle portion thereof to stiffen the beam and allow the beam to be securely connected to the vibratory device. The first beam may also be used with its longitudinal axis parallel to the lengthwise axis of the vibratory device.

Abstract: In combination with resonant sonic earth drilling components, and for particular use in retrieving a core sample in a core barrel seated against an internal shoulder in a sonically driven drill bit, a resilient axial loading device not only urges the bottom of the core barrel into continuous contact with the seat but also cushions the core barrel from the sonic energy in the drill bit, thereby minimizing damage to the core sample.

Abstract: A power tool including a machine base, a fixed jaw fixedly secured to the machine base, a movable jaw turned about a pivot on the fixed jaw, a spring supported between the fixed jaw and the movable jaw to force the movable jaw into the closed position on the fixed jaw, a motor mounted within the machine base, a speed reducer, an eccentric shaft coupled to the motor through the speed reducer, and a link reciprocated by the eccentric shaft to turn the movable jaw about the pivot, causing the movable jaw to act against the fixed jaw in processing the workpiece put between the movable jaw and the fixed jaw.

Abstract: A pile driving apparatus including two vibratory hammer units fixed to the top of a support plate having a U-shaped cutout, and a pair of hydraulic clamps fixed to the bottom of the support plate. The support plate is secured to the pile when the hydraulic clamps on the bottom of the support plate engage flanges provided on a hydraulic pile clamp which is clamped to the pile. Hydraulic motors housed within the vibratory hammer units cause the pile to vibrate in a vertical direction, thus gradually driving the pile into the ground. The U-shaped cutout allows the support plate to be positioned on the pile, with the pile passing through the support plate, without having to lift the vibratory hammer and support plate assembly over the top of the pile. This arrangement is particularly advantageous in circumstances where overhanging structures limit the clearance available above the location of the pile.

Abstract: A vibrator yoke assembly (Y) for drill stems is moveably mounted on a drilling rig (R). A guide rail (10) is mounted to a support section (22) of the drill rig (R). Traveling along the guide rail (10) along the direction of travel for the drill string while boring the hole is a carriage (28) supporting the yoke assembly (Y). Activation of a motor moves the carriage (28) along the guide rail (10) as desired by the operator. Affixed to the carriage (28) above the upper end (12u) of the upper section (12) of the drill string (14) is the yoke assembly (Y). The yoke assembly (Y) has an upper hydraulic motor (40) coupled to an upper end (42) of a quill body (44). The quill body extends through the yoke assembly (Y) and a lower end (48) of the quill body engages the upper pipe end (12u). A pair of vibrators (52a and 52b) are attached to the yoke assembly (Y).

Abstract: A vibration pile driver for ramming and/or pulling ram material in which eccentric masses are positively coupled in pairs by flexible draw elements and are adapted to be continuously adjusted and locked in opposite directions.

Abstract: A rotary-vibratory drill coupling has a first component with a plurality of spaced-apart members. Each member has a pair of opposed, spaced-apart faces defining a slot therebetween. A second component has a plurality of angularly spaced-apart blade-like projections extending radially thereon. Each of the projections is slidably received between one pair of the opposed, spaced-apart faces on the first component. Preferably there are anti-friction linings between the projections and the faces.

Abstract: The centrifugal force drive machine for generating force in a controlled direction is provided. The machine includes a machine frame having a shaft mounted thereto for rotation about its axis. The drive mechanism is provided to rotate the shaft about its axis. At least one mass is mounted on the shaft for rotation therewith. Each mass has a center of gravity which is moveable radially with respect to the shaft between the position in which the mass is rotationally balanced about the shaft and a position in which the mass is unbalanced. A control member in an operative connection between the mass and the frame is provided to constrain radial movement of the mass between the balanced position and the unbalanced position during each revolution thereof. When a mass is in the unbalanced position, the centrifugal force generated by the rotation of the mass is transmitted to the control member, thereby generating a linear force in the controlled direction.

Abstract: A pile driving and/or pile pulling vibratory assembly for imparting a vibratory force to a pile wherein the vibratory assembly has a housing and a pair of counterweights rotatably carried in receiving areas within the housing. The counterweight has a cylindrical gear portion and an eccentric weight portion integrally formed therewith. The eccentric weight portion has insert-receiving areas therein that are adapted to each receive a solid tungsten rod. The solid tungsten rod is adhered within the insert receiving area with an adhesive. Driving motors are operatively connected to the counterweights and are adapted to rapidly rotate the counterweights within the housing in order to generate substantial vibratory forces.

Abstract: A vibrating hole forming device for seismic exploration in which a vertically elongated mounting pipe with attached rack gear is powered vertically by a hydraulically driven pinion gear which will mechanically push the pipe downwardly into the earth's surface. A vibrating mechanism imparts vibration to the downward force exerted by the pinion gear and rack gear. Vibration is imparted to the pipe automatically when hydraulic pressure required to operate the pinion gear reaches a predetermined pressure such as when the point on the lower end of the pipe encounters a predetermined resistance to further downward movement. This enables a lightweight unit to impart a constant downward force and a vibration force when needed to enable the device to penetrate through sands or extremely dense subsurface terrain thereby eliminating the necessity of providing a heavy weight vehicle such as is required when conventional hole forming devices are used on which the device is mounted.

Abstract: The specification discloses an apparatus for driving and/or pulling a pile which basically comprises vibratory device, a pulling device, a plurality of shock absorbing members, and shock connecting apparatus. The vibratory device generates a vibratory force and applies this force to the pile. The pulling device applies a tension load to a carrying member. The shock connecting apparatus is operatively connected to the carrying member, the shock absorbing members, and the vibratory device. The shock connecting apparatus so selectively connects each of the plurality of shock absorbing members between the vibratory device and the pulling device that the total shock absorbing capacity of the apparatus is incrementally increased as the tension load applied to the carrying member increases.

Abstract: A first rotation driving mechanism including a hydraulic motor (26), a driving gear (27), and a driven gear (29) is provided between a coupling arm unit (12) attachable to the operational arm of a construction machine such as a hydraulic shovel, etc., and a hanger unit (14) to relatively rotate them in the horizontal plane, and at the same time, a second rotation driving mechanism including a hydraulic cylinder (32) and a rocking arm (34) is provided between the hanger unit (14) and a main body (20) to rotate them in the vertical plane. The positional changes of the hanger unit (14) and the main body (20) are automatically performed by a remote control rapidly and easily, and further, with safety to improve the mobility and operativity of the piling, and the pile installation and removal.

Abstract: A vibrator has two series of eccentric weights each comprising at least two weights turning in opposite directions and at least one motor coupled to the first series of weights by gearing and to the second series of weights by a transmission device including a phase-shifter in the form of two coaxial shafts each comprising helical teeth and an annular piston which slides between the two shafts, delimiting therewith at least one working chamber into which a pressurized hydraulic fluid can be injected. The piston has helical teeth meshing with those on the two shafts. The vibrator enables self-regulation of the amplitude of the vibrations that it produces according to the behavior of the object to which the vibrations are imparted.

Abstract: An improved electric vibrator tool which is equipped with a driving mechanism housed in the handle case thereof and having an eccentric disc which actuates a driving rod to perform reciprocating operations; a clamping element is attached to the end of the driving rod to receive a tool bit which is reciprocally operated, such as, a tatooing needle, a carving knife and the like; at the end of the handle case is removably attached with a power box in which are disposed non-rechargeable or chargeable batteries and a plug for charging purpose is disposed at the end of the case; or an adaptor is attached instead of battery box to the handle case so that the present vibrator tool can be operated by A.C. power source. A switch concealed inside the tool is actuated by way of rotation so as to make the operation of the tool safer.

Abstract: A public works machine is disclosed usable particularly for laying vertical artificial drains, of the type comprising a carrier frame, a tool carrying mobile assembly and means fast with the frame for vertically guiding the mobile assembly, characterized in that said mobile assembly (28) comprises a plurality of penetrating tools (34, 134, 234, 334) in particular for simultaneously laying several drains, and in that said guide means comprise a plurality of guide paths with vertical extension (38, 138, 238, 338). Advantageously, the guide paths are formed by suitably stretched cables.

Abstract: A shock absorbing apparatus for a vibratory pile driving/pulling device having a base section connected to a vibrating device, a connecting section connected to a carrying member such as a lifting cable and an intermediate section operatively connecting the base section and the connecting section. First shock absorbing members are provided for resisting force of relatively small magnitude between the base section and the intermediate section and second shock absorbing members are provided for resisting force of relatively greater magnitude between the intermediate section and the connecting section. A limit stop is provided to limit the relative vertical displacement between the base section and the intermediate section such that the second shock absorbing members absorb much of the load when the apparatus is under a substantial external load.

Abstract: A vibratory pile driver having means for clamping onto a pile or similar structure to be driven or extracted substantially linearly, e.g. vertically, includes a hydraulic gear motor having two oppositely rotatable shafts and a pair of semicircular weights aligned in the same vertical plane. Each weight is rotatably secured to a shaft parallel to the motor shafts. Means, in the form of drive and driven pulleys, sprockets or the like connected by toothed timing belts, chains or the like, respectively, are provided for driving the weights from the motor shafts. Since the gears of the hydraulic gear motor operate in synchronization, the weights are driven synchronously to provide substantially linear, e.g. vertical, forces. Such an arrangement combines the synchronizing gears and the power source and makes it possible to eliminate relatively large gears, to use larger diameter weights and to achieve, under certain designs, a smaller overall machine width adjacent the pile to be driven.

Abstract: A vibratory apparatus includes an outer member with a central opening. An inner member is within the opening of the outer member. There are two sets of bearings between the outer member and the inner member for permitting relative rotation therebetween about an axis. The two sets of bearings are spaced apart along the axis, each having an inner race and an outer race. The inner races are slidably mounted on the inner member. A portion of the outer member is disposed between the outer races so as to hold the outer races a first distance apart and so the inner races are held a second distance apart when the inner member and outer member are unloaded. Each of the sets of bearings transfers from the inner member to the outer member those forces acting along the axis which are directed towards the other set of bearings only. There is a spacer disposed between the inner races.

Abstract: A vibrator apparatus adapted for rubbing absorbent granules against a surface to remove oil spots therefrom. The apparatus comprises a platen having a generally flat lower face for engaging the surface, and a power driven shaft rotatably mounted on the platen and eccentrically weighted for vibrating the platen to rub the granules against the surface. The eccentrically weighted shaft comprises at least two eccentric weights mounted on the shaft and projecting radially therefrom at axially spaced locations. At least one of the eccentric weights is rotatable relative to the shaft to adjust the relative angular orientation of the eccentric weights and releasably lockable to the shaft, whereby adjustment of the relative angular orientations of the eccentric weights alters the vibrating motion of the platen. A method of removing oil spots with the vibrator apparatus is also disclosed.

Abstract: A vibrator for a concrete block molding machine to make molded concrete blocks comprises a vibrating table which receives wooden production pallets with a block mold on support bars and further comprises a vibrating drive. Infinitely adjustable amplitude level and frequency setting of the vibrating table is permitted because the vibrating drive means comprises four unbalanced vibrating shafts disposed especially in pairs beside and above each other. Those of the vibrating shafts which are arranged horizontally beside each other are adapted to be driven in contrary sense at the same number of revolutions by way of universal joint shafts from a regulator and distributor transmission. An hydraulic drive motor attached to the transmission is fed from an hydraulic pump of adjustable delivery volume of the hydraulic unit. Thus the vibrating frequency is adjustable by the rotational drive speed of the two horizontal vibrating shaft pairs (directional oscillators).

Abstract: A vibratory hammer/extractor for use with elongated pilings and the like extended into the earth includes a clamping assembly for releasing and securing the hammer to an upper end portion of a piling extended into the ground. A vibratory exciter is mounted on the clamping assembly for generating vibratory forces to be imparted to the piling while clamped tightly, and a suspension device is provided for supporting the exciter and isolating the vibration thereof from a hammer supporting element such as a flexible cable extending downwardly from the boom of a crane. The vibratory exciter includes a hollow gear case having a lower end wall secured to the clamping assembly and at least one pair of eccentric weights mounted on shafts for rotation about an axis transversely of the clamped piling for imparting vibratory forces to the piling as the eccentrics are driven in rotation.

Abstract: An improved vehicle-mounted lifting apparatus for a vibratory device. The apparatus includes bearings in which a principal pivot shaft is journaled, a lifting link and at least one center-bonded joint spaced along and nonrotatably mounted on the pivot shaft, a lift cylinder secured to the vehicle and extending to the lifting link, and a rigid arm extending from each center-bonded joint to a support for the vibratory device. Although a compact simplified lifting structure, excellent vibratory isolation to protect the lift cylinder is provided.

Abstract: This invention relates to a method and apparatus for simultaneously driving a plurality of drain boards, radially aligned about a common center, to stabilize and improve terrestrial and submarine foundation soils and submarine soils. This method, using standard width drain boards, can cover a wide absorption and drain area with a relatively small number of drain board driving operations.

Abstract: A vibration generating apparatus including a support body having a first center axis, a first spherical joint element provided at a forward end of the support body and having the center of a sphere located on the first center axis, a vibrating body having a second center axis passing through the sphere center, a second spherical joint element provided on the vibrating body and concentric complementary with the first spherical joint element to cooperate therewith to allow the vibrating body to be supported on the support member for universal movement, a rotary shaft coaxially rotatably supported within the vibrating body, a pair of eccentric weights mounted on the rotary shaft with a phase deviation of 180 degrees and in a manner symmetrical with respect to the sphere center, and a drive motor connected to the rotary shaft for driving same for rotation whereby the pair of eccentric weights are rotated about the second center axis to cause the vibrating body to move in conical motion vibration such that the sec

Abstract: The invention is directed to an apparatus for resetting the vibration amplitude of a hydraulically driven vibration device having two eccentric weights arranged on a rotating shaft and rotatable relative to each other. The amplitude-resetting arrangement includes a hydraulic directional valve for resetting the vibration device between high and low amplitudes. The valve is electrically operated and the electric control circuit incorporates a time-delay relay for delaying the amplitude change until the speed of the rotating shaft has been reduced to an acceptable level.

Abstract: 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 massive and eccentrically mounted weights on the shafts, and respective nonpositive hydraulic drive motors on the housing connected to the shafts for oppositely rotating the shafts and the respective weights. Thus the weights are independently and nonpositively driven and are not mechanically linked together so that the horizontal components of their rotation cancel each other out and the two opposite rotations automatically synchronize themselves with each other.

Abstract: A vibratory impact hammer including a hammer body assemblage suspended by rubber mounts for reciprocal axial movement in a support frame, the rubber mounts providing guiding and damping action of the assemblage in either director of axial movement without extraneous friction forces acting thereupon, and a pair of synchronously driven eccentric weights which are arranged to provide vibratory movement of the assemblage.

Abstract: Vibrations having a frequency exceeding 150 Hertz are established in a rigid body by means of a vibrator system that in one embodiment includes a pair of rotating wheels, only one of which has a weighted eccentric secured to its axle. The wheels are coupled together by an endless belt made of a material that dampens the vibrations propagating between the wheels. The unweighted wheel is driven by a flexible shaft connected to its axle. In another embodiment three wheels are used in which two are weighted at the axles. The vibrator system may be used to sink pipes and the like into the ground, or snake a sorting table employed, for example, in the mining industry or a silo hopper for discharging grain. Also disclosed is a method for sinking a pipe or the like into the ground and retrieving it after lowering it a predetermined distance. In this method, wires are attached at each end of the pipe for facilitating its downward motion and its retrieval.

Abstract: An impact-delivery tool (20) includes a motor-driven gear (72) which supports for continuous rotation therewith a relatively shiftable drive pin (80). The drive pin (80) is selectively shifted to couple the rotary drive of the gear (72) to a reciprocably operable, impact drive bar (76). An interrupt mechanism (78) which detects workpiece engagement by the tool (20) and operator actuation of the tool, both necessary for tool operation, controls the coupling and decoupling of the drive pin (80) relative to the drive bar (76). The interrupt mechanism (78) provides selective processing of the tool (20) through an impact delivery power stroke and a return stroke while also precluding successive power strokes.

Abstract: Vibrations having a frequency exceeding 150 Hertz are established in a rigid body by means of a vibrator system that in one embodiment includes a pair of rotating wheels, only one of which has a weighted eccentric secured to its axle. The wheels are coupled together by an endless belt made of a material that dampens the vibrations propagating between the wheels. The unweighted wheel is driven by a flexible shaft connected to its axle. In another embodiment three wheels are used in which two are weighted at the axles. The vibrator system may be used to sink pipes and the like into the ground, or shake a sorting table employed, for example, in the mining industry or a silo hopper for discharging grain. Also disclosed is a method for sinking a pipe or the like into the ground and retrieving it after lowering it a predetermined distance. In this method, wires are attached at each end of the pipe for facilitating its downward motion and its retrieval.

Abstract: The present invention provides an improved mechanism for positioning the weight relative to the resonant beam in resonantly driven impact systems.

Abstract: Two flyweight shafts 12,22 are coupled by means of gears 18,30 each attached to one flyweight shaft 12,22 and two intermediate gears 54,56 each engaging one of these gears 18,30 and mesh with each other. Each of the intermediate gears 54, 56 is mounted on one of the oscillating cranks 32, 34 pivotably mounted on the associated flyweight shaft 12 and 22, respectively. The oscillating cranks 32 and 34 are held parallel to each other and can be pivoted to effect a relative phase displacement of the flyweight shafts 12, 22. The oscillating cranks 32,34 are provided with counterweights 62,64 and are thereby mass balanced to prevent oscillations from becoming effective on the oscillating cranks 32,34 and thus on the adjusting mechanism 60 during vibratory operation due to intertial forces.

Abstract: A vibratory ram for ramming and/or drawing of ramming members, comprises at least two out-of-balance rotors, at least one motor and at least one transmission which drive the two out-of-balance rotors in synchronism in opposite directions, at least two unbalanced masses on each of said out-of-balance rotors, wherein each out-of-balance rotor has a first unbalanced mass disposed on a first shaft and a second unbalanced mass disposed on a second shaft, said first and second shafts being concentric and being rotatable about their common axis, and a phase adjusting device for altering the relative phase of the first and second shafts.

Abstract: A front end loader has a loading bucket secured to a tractor and a transversely elongate cutter blade closely spaced forward of a lower front edge of the bucket. Improved apparatus for reciprocating the blade in forward and aft directions relative to the front edge of the bucket is disclosed. A force transmitting beam has a resonant frequency with at least one node and first and second anti-nodes at the resonant frequency. A source of vibrations at or near the resonant frequency is coupled to the beam near the first anti-node to vibrate the second anti-node about a neutral position. The beam is secured near one node so as to locate the neutral position of the second anti-node in spaced relationship from the cutting blade within striking distance thereof. The second anti-node thus applies unidirectional force impulses to the blade in a forward direction as the second anti-node vibrates to drive the blade intermittently forward.

Abstract: The vibrational output of a sonic oscillator is coupled to a compliant member which may comprise a steel stem member. The frequency of the oscillator is adjusted so as to effect resonant standing wave vibration of the compliant member. The resonant vibratory energy is coupled from the compliant member to the pile or other object to be driven by means of a coupler clamp which provides limited bidirectional freedom of motion along the axis of the pile. The coupler clamp further has a guide member which may comprise a partial skirt which controls the angular orientation between the pile and the compliant resonator member. This keeps the sonic energy concentrated along the axis of the pile and prevents significant lateral vibrational modes in the pile. The oscillator resonator member and pile are suspended from an appropriate structure, such as a boom, such that the downward bias weight at the coupler clamp can be controlled. In view of the limited freedom of motion provided in the coupler clamp, i.e.

Abstract: A method and a device for consolidating soil or driving a pile into the gnd by thrusting forces transferred to the soil or the pile through a transmission ground foot, the forces being derived from at least two sources, viz. a mass load and a vibratory member, the latter of which is adapted to produce a varying vertical thrusting force and is adapted to be brought successively out of and, in a shock-like manner, into engagement with the transmission ground foot, with no buffering springs being disposed between the vibratory member and the ground foot.

Abstract: A bulldozer having a transversely elongate cutter blade closely spaced from the bottom edge of the mold board is disclosed. The cutter blade is mounted for reciprocal motion in forward and aft directions relative to the mold board. Unidirectional force impulses are applied to the cutter blade in a forward direction to drive the blade intermittently forward without aft motion. Preferably, the unidirectional force impulses are applied by first and second matched force transmitting beams. Each beam has two divergent approximately straight legs that meet at a juncture to form an acute, approximately 90.degree. angle, a node at the juncture, an input anti-node at the end of one leg, and an output anti-node at the end of the other leg at the input frequency. A source of vibrations at or near the resonant frequency is coupled to the input anti-node and the output anti-node is disposed in spaced aft relationship from the cutter blade within striking distance thereof.

Abstract: A sonic generator produces a reciprocating force that is transmitted to a tool by a resonant or nonresonant force transmitting member having an output that reciprocates about a neutral position responsive to the force of the sonic generator. A continuous unidirectional force is applied to the sonic generator by a tool carrier. The tool advances intermittently along a work path through a medium responsive to the continuous unidirectional force and the reciprocating force. A gap is held between the neutral output position of the transmitting member and the tool when the tool is unable to advance through the medium responsive to the continuous unidirectional force and the reciprocating force. Specifically, the force of the sonic generator is sufficiently large relative to the unidirectional force to overcome the latter, and to drive the tool holder back away from the tool when the tool is unable to advance along the work path, thereby establishing a protective gap.

Abstract: A surface impact system including a mobile carrier vehicle is disclosed. A beam is provided having a resonant frequency with a pair of nodes spaced from the input and output ends of the beam and anti-nodes at each end and at the center. An oscillator is fixed to the input end of the beam to vibrate the beam at at least near its resonant frequency. The beam is mounted to the carrier vehicle at the node near the input end of the beam. A weight is superimposed over the beam at the node near the output end, and has a bearing surface adapted to bear downwardly against the beam at that node. The weight is coupled to the vehicle to control the vertical position of the weight. A tool depends from the output end of the beam, and strikes the surface on which the vehicle rests at the vibration frequency of the beam as the tool vibrates responsively to vibrations of the beam. The reaction force generated by the tool is substantially absorbed by the weight and not transmitted to the carrier vehicle.