Abstract: A machine for compacting and leveling a poured floor covering. The machine includes a frame having a pair of side members and a pair of parallel, ground engaging, cylindrical rollers rotatably supported on the side members and supporting the frame for movement in forward and reverse directions. A screw member is rotatably supported on the side members and has a right-hand screw segment over a portion of the length thereof and a left-hand screw segment over a remainder portion of the length thereof. If desired, a second screw member, a trowelling mechanism and a vibratory mechanism, can be provided. Structure is provided on the front screw member for pushing the material arriving at the region between the screw segments forwardly of the machine, the leveled material passing under the screw member, as the machine is moved forwardly, being compacted by successive passage beneath the cylindrical rollers.

Abstract: A road compacting drum is equipped with a dual amplitude, rotational, vibratory mechanism. A shaft rotatably mounted on the drum supports eccentric weights. Casings secured to the shaft adjacent the weights have chambers accommodating fluent mass. The fluent mass comprise metal members, as steel balls, shot or liquid metal, that move to a first location in the chamber upon rotation of the shaft in one direction to increase the amplitude of the vibration of the shaft and drum. The fluent mass flows to a second location in the chamber in response to rotation of the shaft in a direction opposite the one direction to generally balance the shaft to reduce the amplitude of vibration of the shaft and drum.

Abstract: An improved mechanism for generating vibrations in the horizontal plane for a ground compacting machine is disclosed. At least a rotary shaft with an eccentric mass mounted for generating required vibrations is rotatably supported within the rolling wheel. The rotary shaft adapted to be rotated by a hydraulic motor assumes the position where its center line of rotation is located on a linear line radially extending from the center line of rotation of the rolling wheel. Rotation of the hydraulic motor is usually transmitted to the rotary shaft for the eccentric mass via bevel gears. Typically, an opposing pair of rotary shafts are disposed opposite to one another relative to the center line of rotation of the rolling wheel. Three or more rotary shafts may be disposed in such a manner that their eccentric masses are distributed so as to assure good weight balance.

Abstract: A centrifugal vibratory exciter of this invention has a tubular rotatable exciter shaft on which a centrifugal mass is eccentrically fixed and in which a control shaft is axially slideably adjustable. Surrounding the exciter shaft, rotatable but not axially slideable relative to it, is a tubular counterweight carrier on which a counterweight mass is eccentrically fixed. A transverse pin carried by the control shaft projects through a slot in the exciter shaft that is elongated lengthwise of it and into a helical groove in the counterweight carrier, to translate axial adjustment of the control shaft into rotation of the counterweight carrier about the exciter shaft but to constrain the counterweight carrier to rotate with the exciter shaft in any position of axial adjustment of the control shaft.

Abstract: The invention is directed to an arrangement for journalling large eccentric forces which are generated by a rotating eccentric assembly. One problem associated with the bearing arrangements of these forces is that the size of the bearing is extremely large which, in turn, results in shaft speed limits that are readily exceeded. By dividing the eccentric assembly into two or more tubular eccentric weights arranged coaxially in relation to each other and journalling these in separate bearings on shaft journals connected to the structure to which vibratory motion is to be imparted, a distribution of the eccentric forces is obtained together with a reduction of the bearing dimensions. The eccentric weights are driven by means of a drive rod arranged on a drive shaft interacting with the eccentric weights. The journalling arrangement and eccentric assembly can be part of a vibration arrangement for imparting vibratory motion to the roller structure of a compactor for compacting soil, asphalt or the like.

Abstract: A method is disclosed for providing optimal compaction of various materials by controlling the vibration amplitude of an adjustable amplitude vibratory roller. The vibration amplitude is automatically reduced when excessively high jolting forces are sensed by transducers carried by the roller or its frame. The apparatus for carrying out the method includes a continuously adjustable eccentric element in the vibratory roller, at least two signal transducers mounted on the roller drum or frame and axially separated, to generate signals representing the vibrational movement of the roller. A regulating system responsive to the signals from the signal transducers reset the adjustable eccentric element to vary the vibration amplitude and provide optimal compaction.

Abstract: A vibratory apparatus in which the amplitude of vibration is continuously adjustable, includes a tubular rotatable shaft journalled in the member to be vibrated, and at least one elongated and flexible eccentric mass element disposed in the tubular shaft. The eccentric mass element is guided along guide surfaces, arranged so that part of the eccentric mass element is urged by centrifugal force away from the axis of the tubular shaft when the shaft is rotating. An adjustment means is coupled to the eccentric element to control the position of the element along the slide surfaces, to thereby vary the vibration amplitude of the vibrating tubular shaft.

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: The mechanism, designed especially for use in an earth compacting drum, comprises a pair of concentrically-arranged, eccentrically-weighted elements, which are rotated in unison by means of a hydraulic motor. The mechanism is housed within an earth compacting drum, and the one eccentrically-weighted element is translatable, axially, and disengageable from a splined coupling, in order that it may be indexed to different rotary positions relative to the other eccentrically-weighted element. In this manner, vibratory amplitudes may be increased or decreased.

Abstract: This invention discloses a simple, fast, inexpensive method of restoring skid friction to worn asphalt or concrete pavement surfaces. This is achieved by traversing the pavement with a smooth heavy cylindrical vibratory roller of the type used in earth compactors at a speed and vibration amplitude less than that it takes to materially chip away the surface structure. The result is a material improvement in skid friction.

Abstract: A material compacting vibration machine provided with an imbalanced system having coaxial first and second independently rotatable shafts carrying first and second drive elements and a pair of unbalanced masses having third and fourth drive elements secured thereto with driving connections between the first and third drive elements and between the second and fourth drive elements, and a drive shaft selectively coupled to the first and second drive elements, wherein the four drive elements all are disposed on one side of the imbalanced system and are shielded by a cover.

Abstract: The drum of a vibratory compactor is normally resiliently rotatably mounted on a frame and has an eccentric shaft mounted therein by a pair of longitudinally bearing assemblies. The outer races of the bearing assemblies must be precisely mounted in bores defined in carriers secured on the drum and the bores must be precisely aligned to insure the co-incident relationship of the rotational axes of the drum and the shaft. In addition to the potential misalignment problem and manufacturing costs, the bearing assemblies must be preloaded towards each other and the load-carrying to size ratio of the bearing assemblies is normally relatively low.

Abstract: In a mass compensated impacting apparatus composed of at least one pair of impacting tools and a common tool carrier supporting the tools, there is provided a two-mass vibration excitation system associated with each tool and including vibrating masses which are positively linearly guided in an essentially non-resilient manner, and a unit driving the vibratory masses with phase relationships such that the resulting average of all mass forces becomes at least approximately zero.

Abstract: A vibrator roller frame for supporting a vibrator roller on a horizontal axis of rotation and for transferring static and dynamic forces, comprises, a closed annular one-piece frame member, preferably made of cast steel, having side, end and corner parts, connected to the vibrator roller and annularly surrounding it. The side, end and corner parts are shaped in accordance with the static or dynamic forces they will receive. The corner parts have inside and outside relatively large radii of curvature and connect the side and end parts. The side and end parts have increasing width from a median axis toward the corner portions.

Abstract: The invention relates to an eccentric element for generating oscillations in ground vibrators. The eccentric element comprises an eccentric mass (2) radially movable on a rotatable shaft (1). The mass is movable to assume a position displaced in relation to the centerline (15) of the shaft when the shaft (1) is rotated, thus causing the amplitude of the generated oscillation to be changed. To enable control of the amplitude, the eccentric mass (2) is lockable by means of a displaceable locking piston (9) arranged in a recess (16) in the rotating shaft (1). The locking piston (9) can thus assume a position entirely thrust-back into the recess (16), wherein the eccentric mass (2) is released, or a thrust-out position in which the locking piston fixes the eccentric mass (2) in one of its end positions.

Abstract: A vibratory roller includes a vibrator operably connected to a rotatable compacting roll. The vibrator is comprised of a rotatable shaft mounted co-axially to the roll and a casing mounted on the shaft and including a chamber and an eccentric mass within the chamber the mass being transversely displaceable in the chamber. Movement of the mass within the chamber provides a variable amplitude for the vibrations induced thereby. The movement of the mass is caused by centrifugal force which urges the mass radially outwardly against a fluid storage space radially outwards of the eccentric mass in the chamber, such chamber in turn communicates through a port with a portion of the chamber radially inwards of the eccentric mass. Fluid thus flows from the radially outwards storage space through the port to the radially inwards storage space and the eccentric mass moves radially outwards until the eccentric mass closes off the port.

Abstract: A shaft arrangement (34) having a transversely displaceable weight member (42) relative to the shaft arrangement's longitudinal axis (B). The shaft arrangement (34) includes a housing structure (36) within compression structure (44) is arranged. The compression structure (44) extends through the housing structure (36) and connects to the displaceable weight member (42). An elastomeric member (50) is captured between the compression structure (44) and the housing structure (36) so as to resist transverse displacement of the weight member and the connected compression structure (44). The elastomeric member (50) maintains the weight member (42) and connected compression structure (44) in a rotatably balanced position relative to the longitudinal axis (B) for rotation speeds less than a predetermined amount.

Abstract: A vibratory mechanism comprises a motor-driven shaft, a first mass carried by the shaft for rotation therewith, and a variable mass supported for rotation relative to the shaft whereby the angular relationship between the first mass and the variable mass can be selectively adjusted to vary the amplitude of vibration. A drive member is rotatable with the shaft. The variable mass carries a plurality of longitudinally and circumferentially spaced abutment surfaces. The drive member carries a contact face. Engagement between the contact face and the abutment surfaces occurs at different angular relationships between the first mass and the variable mass to vary the amplitude of vibration.

Abstract: A vibratory compactor vehicle includes a roller drum provided with internal concentrically mounted eccentric weights which are rotated for imparting vibration to the drum. The weights are mounted upon concentric shafts of helical polygonal shape having mating, helically ribbed and grooved surfaces, whereby longitudinal movement of one of the shafts with respect to the other brings about relative rotation of the weights, thereby changing the amplitude of the resulting vibration.

Abstract: A vibratory compacting roller includes a rotatable compacting roll, and a motor driven vibrator. The vibrator includes a shaft, a movable mass rotatable with the shaft and adjustable transversely thereof, and a position regulator for regulating the position of the mass to provide for a variable amplitude of vibration, the amplitude of vibration of the vibrator being lowest when the center of gravity of the mass is nearest the shaft and greatest when the center of gravity of the mass is farthest from the shaft. The position regulator comprises a spring which automatically positions the eccentric mass to the low amplitude position when the shaft is at rest, whereby minimal start-up torque is imposed upon the motor. A releaseable locking mechanism locks the mass in the low-amplitude position.

Abstract: An impact roller for applying blows cyclically to a surface over which the roller is rolling. The roller has flail members pivotally connected thereto and also has recesses to accommodate the flail members when inoperative. In operation, when the roller rolls along a surface, the flail members fall forwardly under gravity and impart cyclic downward blows to the surface over which the roller is rolling. Upon faster rolling of the roller, the magnitude of the blows increases under the action of centrifugal force.

Abstract: Apparatus for controlling the frequency of vibrations imparted by the vibrating element of a compacting machine to the ground which comprises a vibration pick-up responsive to the amplitude of vibrations of a mass composed of the vibrating element and the ground being vibrated which produces a vibration signal; a position sensor sensing the angular position of an eccentrically loaded rotary shaft on which the vibrating element is mounted, which produces a position signal; and a phasemeter which receives the vibration and position signals and provides an output signal related to the phase difference therebetween. This phase difference may be displayed in which case the motor for the rotary shaft can be controlled manually in accordance therewith or it may be fed to an automatic control system in which it is compared with a set signal to produce an error signal for automatically regulating the speed of motor turning the rotary shaft.

Abstract: A vibratory road roller has a drum adapted to be vibrated as it rolls along the ground, to this end the drum containing a vibrator device of the type which produces a vibratory effect as a result of rotation of an out-of-balance mass. The vibrator device comprises a casing, fixed to an end plate of the drum, and a rotor which has a fluid-containing cavity with the contained body of fluid contacting a swept internal annular surface of the casing. A piston movable radially in the rotor and/or the body of fluid provides the out-of-balance mass, and the vibratory force is transmitted to the casing and hence to the drum by the fluid pressure acting on the swept annular surface of the casing. The rotor structure itself is mechanically balanced so that substantially no vibratory force is transmitted through the rotor shaft and bearings.

Abstract: An earth compacting machine includes an earth contacting drum rotatably supported on at least one main drum support bearing mounted in a drum support assembly which is fixed to the machine frame. Means is provided to slowly rotate the drum with respect to the frame. There is a slow speed rotary seal between the drum support assembly and a main drum hub which extends outwardly from the drum. The interior of the drum support assembly, the rotary seal and an outer surface of the main drum hub form a first lubrication oil sump. Oil is introduced into this sump to cover a substantial lower portion of the main drum support bearing. A vibratory shaft bearing is mounted in a vibratory shaft bearing housing at each end of the drum. These shaft bearings support a vibratory shaft inside of the drum. Means opening through the main drum support bearing and the main drum hub is provided to rapidly rotate the vibratory shaft with respect to the drum.

Abstract: Speed and direction of movement of a vibratory roller are controlled by a member which is manually shiftable to a neutral position at which the roller is stopped, through a range of forward positions at one side of neutral, and through a range of rearward positions at the opposite side of neutral. The member actuates a cutout switch that is open only when said member is in neutral, a forward switch that is closed only in the range of forward positions, and a reverse switch that is closed only in the rearward range. A vibratory exciter for the roller operates forwardly when a forward solenoid is energized and reversely when a reverse solenoid is energized. Each solenoid is energized through the contacts of an associated relay, which are closed when the coil of the relay is energized through a circuit comprising, in series, a current source, the cutout switch, and the respective forward or reverse switch for the solenoid.

Abstract: A vibratory compacting roller adapted to be coupled to a prime mover and equipped with hydrostatic drive and vibrator, both drivingly connected to a hydraulic power generator located on said prime mover, is provided with recessed tamping elements distributed in parallel adjacent rows around the periphery of the roller cylinder face with a peripheral offset between adjacent rows. The tamping elements are of trapezoidal design with a semi-circular recess extending centrally from the base to the short side, said recess rendering a vibrational compacting roller with tamping elements equal in weight to a plain vibratory compacting roller of the same over-all diameter.

Abstract: PCT No. PCT/US79/00495 Sec. 371 Date July 11, 1979 Sec. 102(e) Date July 11, 1979 PCT Filed July 11, 1979A compacting apparatus (10) has an impact apparatus (17) and a compactor (19). The impact apparatus (17), such as, for example, a rock breaker, provides impacting forces on the compactor (19). The compacting apparatus (10) is positioned on, for example, a work structure (12,14,15) of a work vehicle (16). It is necessary to compact material in order to provide, for example, proper filling of a trench (74) after a pipe has been placed in the trench. Compaction, as done by the compacting apparatus (10), is provided by simultaneously compacting the material and applying a compressive force to the material and remolding the material. Therefore, satisfactory compaction can be provided in the trench (74) by the work vehicle (16) which is also usable to excavate and refill the trench (74).

Abstract: In a preferred embodiment of the invention a pair of shock plates are disposed in parallel, and substantially bi-planar, coupled together by elastomeric elements. One of the shock plates has a cut-out therein and the other has a limb extending into the cut-out and spaced apart from the sides thereof. The one shock plate is mounted to the drum bearing housing of the earth compactor, and the other shock plate is mounted to the frame. Accordingly, upon the drum being vibrated, or shocked, or otherwise displaced, the limb engages one or more sides of the cut-out, and the movement between the plates is thereby limited to a given distance, in order that the elastomeric coupling will not be unduly stretched, destroyed, or fatigued too early.

Abstract: An operating and down-pressure hydraulic control system for vehicle-mounted implements such as earth compactors and the like. The assembly of hydraulic cylinders, valving and a hydraulic accumulator provided herein operates as a hydraulic system to raise, lower and otherwise position an implement and to provide down-pressure to it. The assembly also permits the hydraulic support of the implement to flex, while maintaining down-pressure on it, when the ground surface elevation rises or falls away relative to the implement as it moves over the ground being worked.

Abstract: A road roller comprises a central frame part, a main drive including a hydraulic pump and a steering control carried by the main frame part. Replaceable roller units each including a frame part detachably mounted on the central frame part at a front and rear end, respectively, of the central frame part comprise front and rear rollers. A hydraulic motor and a hydraulic steering mechanism are incorporated in at least one of the roller units, the hydraulic motor being connected to the hydraulic pump to be powered thereby for driving the roller and the steering mechanism being connected to the steering control for steering the roller.

Abstract: A two-to-one or greater slope is stabilized by rolling a vibratory compactor upslope and simultaneously vibrating the compactor's roller. The compactor comprises a frame on which is rotatably mounted a suitable compaction roller. An engine is rotatably mounted on the frame, and means are provided for adjusting the tilt of the engine relative to the frame, so that, in use, the engine will remain upright while driving the vibratory shaft of the roller. The engine is remotely controlled, as by radio waves, by an operator riding a vehicle on the shoulder of the embankment. A crane and winch on the vehicle riding on the embankment control the movements of the compactor on the slope.

Abstract: A vibratory compacting roller adapted to be coupled to a prime mover and equipped with hydrostatic driving and vibration exciting means, both drivingly connected to a hydraulic power generator located on said prime mover, is provided with recessed tamping elements distributed in parallel adjacent rows around the periphery of the roller cylinder face with a peripheral offset between adjacent rows. The tamping elements are of trapezoidal design with a semi-circular recess extending centrally from the base to the short side, said recess rendering a vibrational compacting roller with tamping elements equal in weight to a plain vibratory compacting roller of the same over-all diameter.

Abstract: A hydraulically operated vibratory soil compactor adapted for use with a loading boom such as a backhoe. Improved construction includes a rectangular structural steel tube welded to a vibrating base plate for providing: structural reinforcement; a sealed housing for an eccentric weight vibrator; and, a supporting surface for shear type springs or shock mounts. A hydraulic drive motor is also mounted on the outside of the central tube member. Improved construction further includes an I-beam section welded between a pair of inverted U-shaped plates to form a tunnel type mounting frame having four arms for connection to the shock mounts supported on the tube member.

Abstract: An easily adjusted vibratory device useful, for example, on soil compacting vibratory rollers. One or more mass elements are supported eccentrically on a rotating shaft. The mass elements are pivotal about a pivotal axis or shaft perpendicular to the rotating shaft. Pivoting the mass elements during rotation of the shaft moves the center of gravity of the mass elements toward or away from the rotating shaft and thereby continuously alters the magnitude of the centrifugal force acting on the mass elements to cause vibration. The mass elements are formed, with respect to the pivotal shaft, to minimize the force necessary to pivot the elements by maintaining the moment arms from the axis of the pivotal shaft to the centrifugal force resultant at or near zero. In a specific embodiment the rotating shaft is cylindrical, the mass elements and pivotal shaft are supported within the rotating shaft.

Abstract: A roller attachment for fixed engagement to any of a variety of conventional vibrator compactors to convert same into a vibrator roller device, the roller attachment including a generally rectangular bottom frame portion defining a generally rectangular central opening in which a plurality of spaced apart parallel rollers are rotatably carried; a top frame portion, fixed to the bottom frame portion, is configurated to receive the operating plate portion, of a conventional vibrator compactor, which is aligned with and bolted to the top frame, and removable rubber tubular treads are provided for the rollers.

Abstract: A vibrating roller is provided comprising a frame with a roller barrel mounted in the frame. The roller barrel includes first and second partial roller barrels, said first partial roller barrel including a central hollow shaft fixed thereto and extending axially therefrom. The second partial roller barrel is rotatingly mounted on said hollow shaft. A rotating unbalanced body is disposed in said hollow shaft for imparting vibratory motion to the first and second partial roller barrels. A prime mover is mounted on the frame, and drives the first and second partial roller barrels through a differential gear assembly. The differential gear assembly includes an externally toothed ring gear which is driven by a driving pinion which itself is drivingly connected to the prime mover. Connected to the externally toothed ring gear are a plurality of beveled pinion gears arranged to rotate about radial axes.

Abstract: An improved roller bearing structure is provided which is particularly applicable for use in vibratory roller compactors. The roller bearing structure includes a first radially outer bearing ring connected to a non-rotating part, a second radially inner bearing ring connected to a rotating part, and rollers engaging the radially inner and outer surfaces of said first and second bearing rings, respectively. Said first and second bearing rings and the rollers located therebetween comprise a roller bearing ring mount. The radially inner surface of the inner bearing ring is provided with an internal gearing for engagement with a drive pinion to provide a driving input to the rotating part to which the inner bearing ring is secured.

Abstract: Vibrator devices, of the type which produce a vibratory effect as a result of rotation of an out-of-balance mass, comprise a casing and a rotor which has a fluid-containing cavity with the contained body of fluid contacting a swept annular surface of the casing. A piston movable radially in the rotor and/or the body of fluid provides the out-of-balance mass and the vibratory force is transmitted to the casing directly by the fluid pressure on the swept annular surface thereof. The rotor structure is mechanically balanced so that substantially no vibratory force is transmitted through the rotor shaft and bearings.

Abstract: A dual roll vibratory compactor is provided with a single lever control for initiating travel in either direction and then starting the rotation of the eccentric weights to vibrate the rolls. Either or both rolls vibrate at low or high selected frequencies according to travel direction. A mode control switch is provided to provide the desired selections. A switch for reversing the selections is provided to maintain the same selections when the compactor is turned around.

Abstract: A vibratory compactor includes a plate which is adapted to contact a substrate to be compacted, and a vibratory member which is mounted atop the plate for vibrating the same. The member includes imbalance elements mounted for rotation about an axis which is substantially parallel to the general plane of the plate. The imbalance elements are mounted for movement to and from a position which they assume once during each revolution. The compactor is further provided with a driving member for driving the imbalance elements in rotation.

Abstract: The device comprises a motor-rotatable unit which includes a rotary shaft having an eccentric mass and a shaft-enveloping sleeve--which sleeve also has an eccentric mass or eccentric weighted portion. The sleeve, which envelops the shaft, is movable in order to effect juxtaposed, radial alignment of the sleeve mass or weighted portion with the shaft eccentric mass, or a diametrically opposite disposition of the sleeve mass or weighted portion (relative to the shaft eccentric mass), so that the two masses effect an additive unbalance, or, eccentricity, cancel out eccentricity, or produce any in between value of eccentricity. Conduits formed in the shaft admit and discharge pressured fluid to and from the shaft and sleeve interface, to cause selective, rotary movement of the sleeve.

Abstract: According to the depicted embodiment, two eccentric-weight units are rotated into or out of radial alignment with each other to cause an increase or diminution of vibration. The units are journaled in a frame and a coupling assembly causes both to rotate in unison, but the assembly is also operative to rotationally index one of the weight units relative to the other to vary the noted radial-alignment relationship, as desired. One of the weight units comprises a pair of separate weights, each having an eccentric-throw portion, which are separated along the rotation axis and which are joined for common rotation by a resilient coupling. The latter coupling sustains and reactively absorbs any misalignments and/or displacements arising between the separate weights. The other weight unit is an elongate, eccentric shaft coaxial with the separate weights.

Abstract: A soil compactor has (1) an apparatus preceding it to measure characteristics of the soil significant to the compaction operation, and/or (2) an apparatus following it to measure characteristics of the soil after compaction. The soil compactor has one or more controls over the compaction operation. The controls are operated in accordance with the measurement indications of said apparatus.

Abstract: A plate vibrator for compacting soil, asphalt and similar materials comprises a bottom plate on which is rigidly mounted a vibrating element driven by a power unit that is mounted resiliently on the bottom plate. The vibrating element comprises at least two counterrotating eccentric weights mounted on a shaft, the phase positions of the eccentrics being capable of adjustment in relation to each other by means of an adjusting mechanism so that the direction of the resultant of the centrifugal forces can be arbitrarily selected in relation to the bottom plate. The location of the element and power unit in relation to each other on the bottom plate and the distribution of the masses oscillating with the bottom plate are chosen to minimize structural height and maximize translational motion both forward and in reverse.

Abstract: A housing is provided defining a central cavity and a rotor is journaled within the cavity and includes at least one piston bore formed therein extending generally radially of the axis of rotation of the rotor. The bore opens outwardly of the periphery of the rotor and a piston is reciprocal in the bore. The cavity defines at least one pair of approach and departure ramp surfaces extending thereabout in registry with which the outer end of the bore swings upon rotation of the rotor and the piston includes anti-friction thrust means on the end thereof remote from the axis of rotation of the rotor engageable with the ramp surfaces. Inlet and outlet means are provided and operative to admit fluid under pressure into the inner end of the bore and to exhaust fluid from the inner end of the bore in timed relation with rotation of the rotor as the thrust means swings into position engaged with the beginning of the departure and approach ramp surfaces, respectively.

Abstract: A vibratory roller is disclosed having an improved amplitude control device giving infinitely variable vibration amplitude which can be both increased and decreased. The roller includes a roll having a coaxial shaft driven at an angular velocity exceeding that of the roll. The rotary shaft has a transversely mounted cylinder within which an eccentric mass is slidably mounted for movement between physical constraints which limit the radially innermost position and the radially outermost position. The eccentric mass and cylinder define a piston cylinder arrangement having a control chamber which communicates with an actuating assembly that regulates radial position of the eccentric mass. The actuating assembly may include a pilot operated check valve and a valve assembly to govern communication between both a pressurized fluid source and a fluid reservoir with one side of an actuating motor piston.

Abstract: A machine for driving and extracting piling and the like having a horizontal support member and frame coupled so that the frame may move toward and away from the support member in a vertical direction, a pair of races located side by side in the frame and defining a corresponding pair of paths of travel spaced horizontally from each other and located in a common vertical plane, a relatively heavily weighted roller mounted for rotation within each race, each roller being rotatable about a horizontal axis perpendicular to the common vertical plane, means for rotating the weighted rollers in synchronism such that the horizontal components of the forces generated on the frame by the rollers cancel one another and the vertical components of the forces are in phase to thereby simulate the impact of a conventional reciprocating pile hammer.

Abstract: A steerable split roll for a road roller includes a pair of roll shells containing means by which vibratory force is applied to each. Between adjacent ends of the roll shells a "turntable" type of bearing both connects the roll shells together for rotation relative to each other and maintains them in axial alignment.

Abstract: A railroad track tamping machine for consolidating and compacting railroad track ballast includes ballast tampers, preferably rollers, adapted to roll over and between the ties, and guides for the rollers to guide them in a manner such that the rollers either roll over and between the ties or along the shoulders. The rollers are mounted in the guides and vibrator arrangements are provided for vibrating the rollers during operation thereof to consolidate and compact the ballast. In a preferred embodiment, the vibrator arrangement comprises a hydraulic system whereby the roller means are vibrated due to rapid fluctuations created in the system. Preferably the rollers are arranged in a set and are located one after the other so that each roller rolls over the same area of the ties and ballast as the other rollers of the set as the device moves once over a length of railroad track to be consolidated.

Abstract: A grab bucket for a grab dredger having a vibrator of waterproof construction mounted on the interior of a bucket shell for causing forced vibration of the grab bucket.