Abstract: A resonant shaker includes a support tray for supporting a target carrier. A sensor generates an electrical signal that is related to an acceleration of the support tray. A linear drive motor includes an armature that is coupled to the support tray. The linear drive motor provides an oscillating drive force to the support tray in response to a drive current applied to the linear drive motor. The resonant shaker also includes a controller. The controller receives the electrical signal from the sensor and a drive signal that is related to the drive current. The controller transmits a modified drive current to the linear drive motor in response to a predetermined phase relationship between the electrical signal and the drive signal.

Abstract: Embodiments of the invention are directed to substrate processing apparatuses and methods for processing substrates. In one embodiment, a substrate processing apparatus includes a processing chamber, a substrate holder inside of the processing chamber for holding a substrate, and a sonic box in the processing chamber for supplying sonic waves substantially perpendicularly to the substrate. The sonic box may comprises a membrane, and a transducer coupled to the membrane.

Abstract: A method for making phosphor ink is provided which uses ultrasonic vibrations to remove surface defect layers from phosphor particles and to quickly and uniformly disperse the phosphor particles throughout a slurry. Propagation of low frequency vibration through the slurry generates cavitation, causing distortion and then removal of the surface defect layer, and propagation of high frequency vibration through the slurry causes the particles to be dispersed quickly and uniformly throughout the slurry. In this manner, a quantity of light generated in the phosphor and corresponding luminance of a PDP is increased.

Abstract: An assay apparatus includes a cell with a working electrode and a sonicating device structurally coupled to the cell for sonication the contents of the cell.

Abstract: A method for mixing at least two fluids includes introducing the at least two fluids into a mixing chamber. The mixing chamber includes a piezoelectric component (500) for mechanical actuation of fluid motion within or adjacent the mixing chamber. The piezoelectric component includes at least first (400), second (410), third (420), and fourth (430) actuation domains, the first and third actuation domains being on first and third opposed sides of the piezoelectric component, and the second and fourth actuation domains being on second and fourth opposed sides of the piezoelectric component. The first and third domains are actuated at a first phase of a frequency of oscillation, and the second and fourth domains are actuated at a second phase of the frequency of oscillation.

Abstract: A method and apparatus for dispersal of aggregates of red and white blood cells and platelets. The present invention employs a sonic or ultrasonic device to efficiently breakup aggregates of red and white blood cells and platelets by driving the ultrasonic signal over a small range of frequencies around the acoustic slow wave frequency of the agglomerate. At this frequency, the fluid vibrates out of phase with the solid and is forced out through the pore structure in the agglomerate.

Abstract: The act of heating water within a contained vessel that is common to most buildings, whether residential or commercial or located in recreational vehicles, mobile homes, aircraft, ships or marine pleasure craft, causes calcium carbonate to precipitate out and settle to the bottom of a heating or fluid containing vessel. The use of ultrasonic transmission within the vessel will agitate the water held within, preventing the normally stagnant hot water from producing calcium carbonate. Other benefits are the cleaning properties of ultrasonic transmission. Thus the internal parts of hot water heaters will enjoy a longer life. This benefit of agitation will also be found when applied to vessels that contain fluids that share similar problems as hot water heaters.

Abstract: A Fresnel Annular Sector Actuator (FASA) for micromixing of fluids, utilizes a self-focusing acoustic wave transducer which focuses acoustic waves through constructive wave interference. In the transducer, RF power is applied between the electrodes (sandwiching a piezoelectric film) with its frequency preferably corresponding to the thickness mode resonance of the piezoelectric film. Strong acoustic waves are generated over the electrode area, and interfere with each other as they propagate in the fluid. By proper design of the electrodes, and forming various combinations of the electrodes, wave focusing can be achieved. The mixing can be further enhanced by providing selective actuation and sequencing of the different segments by an RF signal source.

Abstract: The act of heating water within a contained vessel that is common to most buildings, whether residential or commercial or located in recreational vehicles, mobile homes, aircraft, ships or marine pleasure craft, causes calcium carbonate to precipitate out and settle to the bottom of a heating or fluid containing vessel. The use of ultrasonic transmission within the vessel will agitate the water held within, preventing the normally stagnant hot water from producing calcium carbonate. Other benefits are the cleaning properties of ultrasonic transmission. Thus the internal parts of hot water heaters will enjoy a longer life. This benefit of agitation will also be found when applied to vessels that contain fluids that share similar problems as hot water heaters.

Abstract: A device for producing disperse mixtures by ultrasound, containing a housing, and a reaction chamber within the housing and at least one sonotrode having a free emitting surface which is directly in effective connection with the reaction chamber and whose end remote from the free emitting surface is coupled to an ultrasonic transducer, wherein the sonotrode is designed as a rod-shaped, axially emitting longitudinal oscillator with the emitting surface corresponding essentially to the surface of the reaction chamber, and wherein the reaction chamber depth which is essentially vertical with respect to the emitting surface is lower than a maximum effective depth of the sonotrode.

Abstract: A method and apparatus for dispersal of aggregates of red and white blood cells and platelets. The present invention employs a sonic or ultrasonic device to efficiently breakup aggregates of red and white blood cells and platelets by driving the ultrasonic signal over a small range of frequencies around the acoustic slow wave frequency of the agglomerate. At this frequency, the fluid vibrates out of phase with the solid and is forced out through the pore structure in the agglomerate.

Abstract: The present invention relates to an apparatus and method for mixing fluids in a manner that ranges from maintaining the integrity of fragile molecular and biological materials in the mixing vessel to homogenizing heavy aggregate material by supplying large amounts of energy. The variety in mixing manner is accomplished using an electronic controller to generate signals to a motor driver in order to control the frequency and the amplitude of the motor, which drives an agitator assembly. The motor may be a stepper motor, a linear motor or a DC continuous motor. By placing a sensor in the mixing vessel to provide feedback control to the mixing motor, the characteristics of agitation in the fluid can be adjusted to optimize the degree of mixing and produce the highest quality mixant, with consistent results.

Abstract: An apparatus for mixing small volumes of liquids using a submerged permanent magnet impeller and a programmable electromagnet driver with variable frequency and magnetic field strength and field gradient. These variables and the duration of their application are controllable by a computer programmed with specific algorithms. The electromagnet driver has no moving mechanical parts. In a typical embodiment a small permanent magnet impeller is submerged in a solution to be mixed while contained in, say, a 1.5 mL Eppendorf conical tube or in a well of a multiwell plate. The tube or well to be mixed is placed above and in close proximity to the electromagnet driver. An operator inputs the frequency, field, gradient, and duration using a graphical user interface. The magnetic field applied to the impeller magnet via the driver electromagnet causes the impeller to undergo rapid motion in all planes thereby transferring momentum vertically in the solution.

Abstract: Method and apparatus for compacting soil and for determining a mechanical characteristic of soil, including a method and apparatus for periodically compacting soil with a soil compacting device so as to make the soil and the soil compacting device vibrate together as a single oscillatory system, analyzing the vibration of the soil and soil compacting device, and adjusting an oscillatory driving force so as to drive the single oscillatory system towards a characteristic resonance frequency &OHgr;.

Abstract: An assay apparatus includes a cell with a working electrode and a sonicating device structurally coupled to the cell for sonication the contents of the cell.

Abstract: In a method and apparatus for suspending solid particles in a predetermined volume of liquid contained inside a container having a wall, the wall being partly isolated from the liquid by a deposit adhering to its internal face, and bringing together at least some of the particles in the agglomerated state, the container is subjected to a reciprocating movement along a reference axis, at a frequency adapted to cause within the predetermined volume of liquid, without any other external action, an ebb and flow on either side of the reference axis, detaching the deposit, and dispersing the particles toward the center of the volume of liquid.

Abstract: The invention concerns a reactor with acoustic cavitation comprising a tube (10) made of flexible material, wherein the liquid to be treated circulates. Electro-acoustic transducers (1) are radially and uniformly distributed around the tube (10). Each electro-acoustic transducer (1) has a general prismatic shape with a base of specific width and a head narrower than the base, the head pressed on the tube (10). Each electro-acoustic transducer (1) includes an electro-acoustic motor (78) mounted at the base such that the vibrations generated by the electro-acoustic motor (78) are amplified at the head by the electro-acoustic transducer (1) shape. Lubricating films (9) extend between the electro-acoustic transducers (1) heads and the tube (10), so as to produce an acoustic coupling of the electro-acoustic transducers with the tube. The whole set is in a sealed chamber (83) where the pressure is maintained at a predetermined value and where the lubricating and cooling liquid circulates.

Abstract: Acoustic energy is used to control motion in a fluid. According to one embodiment, the invention directs acoustic energy at selected naturally occurring nucleation features to control motion in the fluid. In another embodiment, the invention provides focussed or unfocussed acoustic energy to selectively placed nucleation features to control fluid motion. According to one embodiment, the invention includes an acoustic source, a controller for controlling operation of the acoustic source, and one or more nucleation features located proximate to or in the fluid to be controlled.

Abstract: The inventive apparatus is comprised of a means for producing cavitation in a complex reaction mixture to enhance the yield of the selected reaction product, a means for controlling the temperature of the complex reaction mixture, especially during cavitation, and a means for affecting magnetic separation of paramagnetic beads to which the selected reaction product is attached from the complex reaction mixture. In one embodiment, the compound(s) or molecule(s) is synthesized in situ, and isolated using the inventive apparatus. The apparatus finds use in the fields of solid phase organic synthesis, and for isolation and purification of a selected compound(s) or molecule (s), especially where automation is desired.

Abstract: A soil compacting device has a damping system which couples an upper mass and a lower mass together with a spring system in a vibration system. The damping properties of the damping system can be modified while the device is in operation. Therefore, when the soil compacting device passes over soils having different properties, it can constantly be adjusted in an optimal manner to the ground underneath it by acting on the vibration properties of the overall vibration system.

Abstract: A balanced vibration generator (1) for resonance-amplified operation of a machine or equipment (20) comprises at least one set of counter-oscillating masses (4, 16, 20) suspended in a spring system (3) in which the resonance springs are helical springs which also support the masses. The generator comprises a built-in, balanced drive system (6, 7, 8). The generator is suspended in securing elements (10, 11) which comprise special, adjustable securing elements (9) which are in engagement with the resonance springs (3) and arranged in such a manner that the resonance springs, when turned around their longitudinal axes (14), can change spring lengths.

Abstract: A method of and apparatus for manufacturing hydrous oil are provided low frequency and low voltage and current signals are applied to a water supply pipe system and a low frequency and low voltage and current signal is applied to an oil supply system. The water and oil mix with each other at a mixing point and a plurality of low frequency and low voltage and current signals are applied to a mixing supply system formed by joining the water supply pipe system and oil pipe system. The mixture of water and oil is subjected to emulsification in a heater-equipped emulsion tank and the emulsification is facilitated with the aid of air so as to produce the hydrous oil. After a low frequency and low voltage and current signal is applied to the hydrous oil, air is supplied to the hydrous oil in an aeration tank. Further, after a low frequency and low voltage current signal is applied to the hydrous oil, the hydrous oil is flowed in a storage tank.

Abstract: A method of mixing two or more kinds of adhesive resin liquids takes the steps of arranging such that resin outlet ports (6a, 7a) of feed tubes (6, 7) for feeding two or more kinds of resin material liquids which are hardened by reaction face a side skin surface (3b) of an ultrasonic wave transmission solid horn (3), allowing the resin material liquids to flow down passing along the side skin surface (3b) while applying ultrasonic vibrations to the resin material liquids, and guiding the resin material liquids to a distal end face (3a) of the ultrasonic wave transmission solid horn (3), thereby mixing the resin material liquids in an aerial state.

Abstract: A system for ultrasonic energy coupling includes an ultrasonic transducer, a horn member defining a passageway, and a pump for moving fluid through the passageway and outwardly of the horn. The method used to accomplish the energy coupling or transfer includes vibrating the horn member with an ultrasonic transducer and pumping fluid through the passageway in the horn member and onto an object.

Abstract: By providing an ultrasonic irradiation apparatus for generating acoustic cavitation efficiently, it is intended to realize an ultrasonic therapeutic apparatus for generating the action of cavitation on a living body suitable for medical treatment of malignant tumors and medical treatment of thrombi and calculi, an ultrasonic diagnostic apparatus for generating cavitation for emphasizing an ultrasonic echo image such as a blood flow and utilizing the reflection capability of the cavitation, an ultrasonic chemical reaction accelerating apparatus, an ultrasonic cleaning apparatus or an ultrasonic sterilizing apparatus. Irradiation focus/code signals for defining irradiated acoustic fields of a fundamental wave and a second harmonic wave as well as focus positions/acoustic pressure distribution forms of the respective waves are applied from an irradiation unit main control circuit to drive phase generating circuits.

Abstract: In the reactor for carrying out chemical reactions with ultrasound, at least three ultrasonic transducers (15) are arranged on the bottom (13) of the reactor (10) and at least six ultrasonic transducers (15) are arranged on the wall (14).

Abstract: A low frequency vibration type washing machine is disclosed that is capable of detecting the range of linear reciprocating movement of its drive shaft to control the vibration range of its low frequency oscillating vibrator to be constant, and sensing water level in its washing tub to control the water level. The washing machine includes a low frequency oscillating vibrator adapted to vibrate in a washing tub while being subjected to a water level pressure. The vibrator thereby generates a resonance phenomenon in a multi-phase medium contained in the washing tub.

Abstract: Piezoelectric elements are attached to both sides of a flexible metal thin plate, thus forming a bimorph-type piezoelectric vibrator. A portion of the metal thin plate is extended to form a stirring blade. A suitable weight is attached to a part of the metal plate such that the amplitude of the blade is made greater than the amplitude of the vibrator itself. The voltage to be applied to the vibrator and the frequency are adjusted, and the vibrator is vibrated in a second-order mode. Thereby, the entire solution is moved simultaneously, vertical motion is caused, and the stirring efficiency is enhanced.

Abstract: This invention relates to an arrangement for driving a high-frequency oscillating tool arrangement (1) which includes, inter alia, a device (1a) whose form changes with a change in voltage, utilizing an electric drive circuit (2) constructed to generate alternating voltage which can be connected to the device and the frequency of which is adapted, through a first control circuit (7), to a value (C1, L1) which momentarily corresponds to the resonance frequency of the reactive element which varies during a working operation. The first control circuit (7) is constructed to control momentary frequency in dependence on momentary phase difference between the current and voltage values of the alternating voltage.

Abstract: A generator for driving an ultrasonic transducer for use in ultrasonic cleaning. The generator is based on a voltage controlled oscillator which drives an output circuit which includes the ultrasonic transducer. The output circuit has a resonant frequency, and a resonance follower produces a control voltage which tunes the voltage controlled oscillator to the resonant frequency. Operating in conjunction with the automatic tuning elements is a constant power control which allows the user to set a desired power level, and monitors the actual output power by means of an output wattmeter circuit, to cause the actual output power to match the level selected by the user. The constant output power circuit is effective even during resonance tracking of the system, or during frequency modulation of the ultrasonic output energy.

Abstract: A plurality of reaction containers each being charged with an agitation ball made of a magnetic material are circularly arranged on a reaction disk so as to be supplied with a reagent and a sample. The reaction disk is driven reciprocatingly at a small amplitude for a predetermined time so as to cause the reaction containers to be vibrated arcuately each time a new reaction container is supplied with the reagent. As a result of the vibration of the reaction containers, the agitation balls in the respective reaction containers vigorously move to agitate the reaction solutions in the respective reaction containers. A photometric device is disposed so as to apply a light to the reaction container thereby to allow a fluorescent or absorbance photometric measurement. In the reaction container brought to the photometric measuring position, the agitation ball is attracted to the wall of the reaction container so as to be kept away from the path of light in the photometric device.

Abstract: A shaking table for laboratory use for agitating liquid in flasks has at least one direct electromagnetic drive, for example, opposed pairs of electromagnets (14, 15) arranged orthogonally. A control device may control pulse frequency and amplitude to the electromagnets to produce different shaking modes. A plurality of drive members connected to an articulation mechanism are movable by the electromagnets, the articulation mechanism being mounted to the table. The table is mounted to a base by a plurality of flexible posts.

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 apparatus and method for making a photometric determination regarding the contents of a sample, such as the absorbance characteristic of a blood serum sample. The improvement allows measurements to be taken after a reduced warm-up period and compensates for variations in the lamp intensity during the period over which measurements are taken. A feedback circuit is provided between a reference photodetector and the light source for causing the light source intensity to asymptotically approach a final stable value in a smooth exponential curve. Signal processing means processes outputs of the reference and sample photodetectors taken at different times so as to compensate for variations in the source intensity over the time period during which the outputs are taken. Still further, the photometer allows resonant frequency mixing of the contents of a cuvette while disposed in the photometer by causing the entire optical assembly, in which the cuvette is mounted, to vibrate at its resonant frequency.

Abstract: A concrete vibrator is disclosed in which a sensorless semiconductor motor is employed for driving an exciter. The sensorless semiconductor motor has an arrangement in which the rotational position of the permanent magnet rotor is sensed through utilization of a voltage which is induced from three-phase stator windings, i.e. a voltage which is induced according to the magnetic flux distribution in the gap and varies its frequency with the rotation speed alone instead of by using the Hall element which is readily damaged by vibration and heat, that is, seriously poor in environmental resistance. Further, the sensorless semiconductor motor is arranged so that the current supply to the stator winding is placed under control of a semiconductor inverter which is controlled by a PWM or PAM system.

Abstract: The instant invention is drawn to an apparatus and process for, direct ultrasonic mixing of a sample by use of an ultrasonic probe, in combination with sample conveying and/or sample analysis, thereby providing: convenient automated flexible sample preparation (e.g. mixing), conveying and/or analysis; and/or greater accuracy and precision of analysis than was previously achievable.

Abstract: A compaction table control system includes a variable speed vibratory motor having an eccentric weight coupled to a compaction table. The motor is operated according to acceleration of sand in a flask to vary the motor speed and thus the acceleration of the sand.

Abstract: An apparatus for processing particulates comprises a vibratory bed including a motor with a vertically disposed shaft, separate remotely adjustable vibratory generating apparatus mounted on each end portion of the shaft and at least three contact structures between the vibratory bed and a flask or vessel containing the particulates. The uppermost vibratory generating apparatus being remotely adjustable to vary the horizontal vibratory force component and the lowermost vibratory generating apparatus being remotely adjustable to vary the vertical conical force component. The contact structures have conically shaped mating surfaces on pins and in recesses in sockets such that when at least one of the conically shaped surfaces are in contact the vessel is restrained to the same horizontal movement as the bed plate.

Abstract: This invention relates to vibratory machines such as grinding machines. A machine 10 has a vibratory unit 13 which is connected to a separate motor 12 by a flexible drive 14. The drive rotates a shaft 23 carrying eccentric weights 25,26 and the resultant gyratory movement is transmitted directly to a vibratory plate 16 through bearings 24. The amplitude vibration can be altered by adjusting the relative position of the weights.

Abstract: Apparatus for periodically sweeping a voltage controlled oscillator over a range of frequencies which includes a resonant frequency of a transducer being supplied with power by the voltage controlled oscillator through a power amplifier. The apparatus includes a digital phase detector having a voltage input coupled to the output of the power amplifier and a second voltage input coupled to a current sensor indicative of the phase of the current flowing through the supply circuit of the transducer to provie at the output of the phase detector a voltage signal indicative of phase difference between the voltage and the current in the transducer. The output of the phase detector is coupled to a processor and to the input of a summing circuit. The output of the processor is also coupled to the summing circuit to provide an offset voltage which adjusts the voltage controlled oscillator to the resonant frequency of the transducer.

Abstract: A variably unbalanced rotating mechanism comprising a frame, a main shaft having a longitudinal axis and supported on the frame for rotation about the longitudinal axis, a drive for rotating the main shaft, first and second eccentric weights mounted for rotation coaxially with the main shaft, and a mechanism for rotating the weights in common with the main shaft and for selectively rotating the weights in opposite directions relative to each other and relative to the main shaft and independently of main shaft rotation.

Abstract: Disclosed is a fluid flow sonic energy reactor particularly adapted for blood hemolysis. An ultrasonic generator is provided with a tapered resonator, the small diameter end of which forms one planar surface of the reactor cavity. The reactor includes an anvil, one end of which has a central surface region that is closely spaced from the small diameter end of the tapered resonator. An O-ring is in contact with the periphery of the small diameter end of the resonator as well as the adjacent surface of the anvil to form therebetween a sealed chamber. First and second bores extend through the anvil to the central surface region thereof to introduce fluid into the chamber and remove fluid therefrom.

Abstract: The subassembly comprises a shaft having an eccentrically-weighted portion journalled in a tube which also has an eccentrically-weighted portion. The tube has an abutment therein which prevents full rotation of the tube relative to the shaft. With rotation of the tube in one direction, its abutment, at one side, comes into engagement with the eccentrically-weighted portion of the shaft and, consequently, both portions are in proximity and radially aligned to produce a maximum, oscillatory vibration. Tube rotation in the opposite direction causes the shaft portion to engage the other side of the abutment and, consequently, the portions are in opposite, radial dispositions, and produce a minimum, oscillatory vibration.

Abstract: New and improved, mechanically self-resonant apparatus and method for the non-invasive mixing of materials are disclosed, and comprise vibrator means including container means for the materials to be mixed, and drive means to drivingly vibrate the vibrator means. Sensor means are operatively associated with the vibrator means and the drive means, and are operable to sense the frequency of vibration of the vibrator means and maintain that frequency at or near the resonant frequency of the vibrator means. This promotes thorough mixing of the materials, and minimizes the energy input required for vibrational mixing of the materials. Control means are provided to control the amplitude of vibration of the vibrator means at or near the resonant frequency to avoid damage to the materials attendant mixing. The container means may take the form of a conduit through which the materials to be mixed are flowing attendant vibrational mixing.

Abstract: Process and means to enhance fluid coverage of surfaces in industrial applications. Generation of a directed force field is employed to provide removal of surface air, improve surface wetting of a fluid, and consolidation and densification of fibrous structures.Apparatus of the invention is described which provides vibratory forces of appreciable magnitude and super-audio frequency and applied to solid, fluid and gaseous combinations, to displace surface gas and promote fluid contact with the solid surface. Apparatus of the invention facilitates the generation and application of the vibratory energy to composite structures of synthetic or natural fibers with a fluid resinous material.

Abstract: In the embodiment shown, the assembly comprises a pair of apertured weights mounted on a rotatable shaft, each of the weights having abutment surfaces one or another pairs of which close upon each other, depending upon the direction of shaft rotation. One of the weights is keyed to the shaft to rotate therewith; the other weight is freely rotatable relative to the shaft. Upon rotation of the shaft in a first direction, a first pair of the abutment surfaces engage, and the eccentricities of the weights then are so disposed as to produce a given-amplitude vibratory force. Upon rotation of the shaft in a contrary direction, a second pair of the abutment surfaces engage, and the eccentricities of the weights then are so disposed as to produce a vibratory force of a differing amplitude.

Abstract: In a process for mixing liquid samples to be analyzed, the liquid sample contained in a sample container is moved and mixed by a mechanically oscillated air column in contact with at least part of the liquid sample surface, the air column being excited with a frequency in the resonant range of the system formed by the air column and the sample liquid.

Abstract: This apparatus is used in industrial treatment processes for fluids constituted of several chemical components which must be perfectly homogenized before taking part in processes, when it is necessary to achieve saturation conditions closest to the stoichiometric conditions. This apparatus is suitable to generate ultrasonic waves of manifold frequencies depending on the viscosity of treated fluid and with its flux velocity inside a duct. The apparatus consists in an ultrasonic waves generator which sends treatment-waves in a duct, to homogenize the arriving fluid by means of a newly conceived transducer which, in the meantime, sends also a beam of controlling waves to detect the achieved homogeneity of treated fluid. Controlling waves are analyzed by binary circuits which accept or reject signals, maintaining or changing the balance between received signals and generated signals until the right frequency of waves is sent to treatment transducer to insure the proper homogenization of the fluid.

Abstract: The present invention is a universal blending system and method for blending the material contents of a silo having a predetermined interior cross-sectional area by layer blending or across vertical columns, column blending, or a combination of layer and column blending.The presently preferred method of the present invention employs either vertical displacement of a partial vertical column of the silo content to provide a representative mixture in every horizontal cross-section in order to reduce the number of necessary recycles to a minimum or substantially simultaneous multilevel displacement, with subsequent uniform discharge over the whole horizontal cross-section of the silo to remix material that may have been segregated during the filling or recycling.

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.