Abstract: A tandem shale shaker having at least a base, at least one upper shaker screen, at least one lower shaker screen, a basket, an apparatus for vibrating the basket, at least one distribution conduit, a flowback pan, a flow director, and a distribution apparatus. The upper and lower shaker screens are releasably mounted on the basket. The at least one lower shaker screen is mounted at a level below the level of the at least one upper shaker screen and underlies the at least one upper shaker screen. The flowback pan is disposed between the at least one upper shaker screen and the at least one lower shaker screen and overlies at least a portion of the at least one lower shaker screen. The flowback pan directs the screened material passing through the at least one upper shaker screen to the at least one distribution conduit.

Abstract: A vibratory screening machine including an outer frame, an inner frame resiliently mounted on the outer frame, a plurality of screening units mounted in stacked and staggered relationship on the inner frame, each of the screening units including a screen-supporting surface and a chamber underlying the screen-supporting surface and an outlet duct in communication with the chamber, an undersize trough underlying the plurality of stacked and staggered screening units, a plurality of inlet ducts in the undersize trough with each of the inlet conduits in communication with one of the outlet conduits, and an oversize trough underlying the undersize trough and the stacked and staggered screening units.

Abstract: A method of manufacturing a large stationary, aggregate processing screening tower by fabricating weldment modules and preassembling them with aggregate processing equipment internal within the weldment modules, transporting the preassembled weldment modules to a field work site where the tower is to be erected on a foundation, aligning the modules and stacking the modules in layers and then bolting adjacent modules together. A large stationary, aggregate processing screening tower has weldment modules preassembled with aggregate processing equipment internal within the modules. The preassembled modules are stacked up on one another and secured together and can receive aggregate product at the top module and the product is processed by screening and sizing as it moves downwardly by gravity through the modules and their processing equipment for final clarification and collection of the product.

Abstract: From one aspect the invention is a method of classifying waste materials comprising arranging two sieve screens, each having an inlet end and an outlet end, one above the other to define a space there between, arranging the upper screen, to be of coarser mesh size than the lower screen, supplying waste material to be classified to the inlet end of the upper screen, vibrating the screens, and blowing air between the screens from the inlet end and towards the outlet end whereby the waste material being blown away from the outlet ends of the screens, and large heavy material falling under gravity from the outlet end of the upper screen, and separately collecting the separated waste material fractions. From another aspect the invention is an apparatus for carrying out the method described above.

Abstract: A vibratory separator apparatus for separating components from a fluid material stream fed to the vibratory separator apparatus, the vibratory separator apparatus, in certain aspects, having separator apparatus for separating components of the fluid material stream, and heating apparatus for heating the fluid material stream. A screening system with a screen mounting basket, at least one screen mounted on the basket, and heating apparatus for heating the at least one screen.

Abstract: A vibratory screening machine including an outer frame, an inner frame resiliently mounted on the outer frame, a plurality of screening units mounted in stacked and staggered relationship on the inner frame, each of the screening units including a screen-supporting surface and a chamber underlying the screen-supporting surface and an outlet duct in communication with the chamber, an undersize trough underlying the plurality of stacked and staggered screening units, a plurality of inlet ducts in the undersize trough with each of the inlet conduits in communication with one of the outlet conduits, and an oversize trough underlying the undersize trough and the stacked and staggered screening units.

Abstract: A system and process for recycling shredder residue, in which separating any polyurethane foam materials are first separated. Then separate a fines fraction of less than about ¼ inch leaving a plastics-rich fraction. Thereafter, the plastics rich fraction is sequentially contacted with a series of solvents beginning with one or more of hexane or an alcohol to remove automotive fluids; acetone to remove ABS; one or more of EDC, THF or a ketone having a boiling point of not greater than about 125° C. to remove PVC; and one or more of xylene or toluene to remove polypropylene and polyethylene. The solvents are recovered and recycled.

Abstract: A process for separating particles of a cohesive form of a polydisperse compound or composition comprising nevirapine, nevirapine hemihydrate, mexiletine or mexiletine hydrochloride according to size is disclosed which comprises milling and sizing the particles in an apparatus which includes individual and/or nested sieves each of which may also include a quantity of beads, disks and/or other geometric or non-geometric shapes. The sieves can be rotated, vibrated or agitated in any and all combinations by various methods to achieve independently horizontal rotation and vertical reciprocation (similar to a merry-go-round) to efficiently segregate, size or mill cohesive and polydisperse powder particles to specific size ranges. The invention also contemplates a method for using the apparatus in the sizing and quantification of aggregated particles of cohesive disperse powders.

Abstract: A flat sifter with self-supporting structure which is preferably used for sifting grain and flour-like products in mills. The aim is to markedly simplify the construction and assembly of such a flat sifter while improving the sanitary conditions. That aim is achieved by combining one or several double compartments, which are mounted laterally adjacent to one another with a universal drive unit.

Abstract: A screen having a frame, three screen cloth layers and a laminating solidified layer with perforations therethrough. The screening layer of the screen cloth is typically of the finest mesh with increasing coarseness to the support mesh. The solidified layer is positioned by placement on the supporting mesh where it is fused to impregnate through each of the screen layers to form surfaces on either side of the lamination. A heat press is employed to so configure the solidified layer. A nonstick sheet between the screening mesh and the heat press molds texture into the surface of the solidified layer for reduced slippage of material being screened on the assembly. The screen lamination is stretched and bonded to a screen frame.

Abstract: The pepper harvester has a harvesting head, a primary conveyor, a shredder, cleaning and separating assemblies, a pepper sizer, a sorting bed and a discharge conveyor. The shredder is mounted above the primary elevator. First and second side plates of the shredder rotatably support three drums for rotation about parallel horizontal axes. The drums have a plurality of radially extending posts. The posts on a first drum project in between the posts on a second drum. The posts on a third drum project between the posts on the second drum. The drums are driven so that the first drum lifts crop material including some pepper from the conveyor. This crop material passes between the first and second drums, between the second and third drums and back to the conveyor. The posts on the drums travel at different speeds and shred cop material other than peppers.

Abstract: In a film processor, filmstrips are contained in their specific cartridge shells with their film leaders attached to a leader plate, and are fed into processing baths with the leader plate in the lead, while being pulled out from the cartridge shells. After the filmstrips are separated from the cartridge shells, the cartridge shells drop on a chute and slide down on the chute. Smaller cartridge shells sift through a sifting slit formed through the chute along the sliding direction, while larger cartridge shells slide down to a lower end of the chute. A lateral guide plate extends under the sifting slit, to guide smaller cartridge shells having sifted through the sifting slit in the lateral direction of the sifting chute toward a cartridge recovery box. Larger cartridge shells drop from the lower end of the chute down to a second cartridge recovery box.

Abstract: An apparatus and method are disclosed for the continuous formation of slurry. The apparatus includes a hopper to receive particulate material; one or more transport/mixing assemblies that mix and transport the solid material and a carrier liquid; and a mixing/averaging tank that receives the solid/liquid mixture from the transport/mixing assembly and performs a final mixing and averaging of the mixture to achieve a desired slurry consistency. An auger inside the tank continuously mixes and shears the slurry. The tank has one or more outlet ports to continuously discharge the slurry. The auger may be bi-directional, to direct the slurry towards dual outlets on opposing ends of the tank. Preferably, a reciprocating screen deck is provided to eliminate oversized particulates before the mixture enters the mixing/averaging tank. Carrier liquid is introduced at several points in the process, including into the transport/mixing assemblies, at the screen deck, and into the mixing/averaging tank.

Abstract: A vibratory screening machine such as used for separating solid particulate material from drilling mud to allow the latter to be re-used, is described. The general form of the construction is similar to that of the VSM100 shaker machine as supplied by the applicant company, but significant differences in the design and construction of the new unit allow a higher throughput of mud to be accommodated. An upper filtering screen (88) extends generally horizontally and serves to separate out the larger particles from the rest. The slurry which passes down to the lower screen (90) (of finer mesh than the upper screen) is further filtered and a mud-like residue of particulate material slowly accumulates on the lower screen (90) and migrates up the screen--to be discharged at the upper outlet end thereof, while liquid material filters through the screen to be recovered in a sump below.

Abstract: A padding machine (10, 100) is disclosed which is capable of separating materials in a spoils bank beside a trench into coarser materials, which are redeposited in the spoils bank behind the machine, and finer materials which are conveyed to the trench for padding the pipeline. The machine includes a conveyor with a conveyor chain which moves around the perimeter of the machine. Material caught by the scraper blade (28) is conveyed by the conveyor chain along a belly pan (70) and thereafter over a plurality of grizzly bars (72). Coarser material which will not pass through the grizzly bars is conveyed by the conveyor chain (56) to the rearward end of the machine and dumped off the rearward end of the machine back to the ground. The finer materials passing through the grizzly bars are again separated by a vibrator unit (76, 104).

Abstract: Milling/sizing apparatus which includes individual and/or nested sieves each of which may also include a quantity of beads, disks and/or other geometric or non-geometric shapes. The sieves can be rotated, vibrated or agitated in any and all combinations by various methods to achieve independently horizontal rotation and vertical reciprocation (similar to a merry-go-round) to efficiently segregate, size or mill cohesive and polydisperse powder particles to specific size ranges. The invention also contemplates a method for using the apparatus in the sizing and quantification of aggregated particles of cohesive disperse powders.

Abstract: An apparatus for the grading of fish into various size categories, utilizing a series of panels with progressively smaller spaces between grading bars on the panels. The panels are attached to a panel box that may be raised or lowered within a holding vat. Water constantly flows through the holding vat, up through the panel box, and out over a spillway at the top front of the holding vat. By raising the panel box, the largest fish are forced out of the holding vat and down the spillway by the grading bars on the panels inside the panel box. Smaller fish swim through the grading bars on the panels with wider spaces between grading bars, and are not forced out of the holding vat until a lower panel with narrower spaces between grading bars is raised to the edge of the spillway. The constant flow of water up and toward the spillway causes the fish to instinctively swim downward and align themselves parallel to the grading bars and keeps the fish oxygenated during the grading process.

Abstract: A vibratory screen system including a screen assembly having screen cloth on both the top and the bottom of the frame. The screen cloth on the bottom has openings larger than and up to five times the size of the openings on the upper screen cloth. A pattern of dividers divide the screen into compartments. The screens are bonded to the frame and to the pattern of dividers.

Abstract: A bar screen is combined with a wire or punch screen which is suspended beneath the screen deck from a pair of oscillating bar support beams so that a single bar screen, screen combination, may not only size materials for thickness but remove small particulate material from the chips or materials which pass through the screen deck of the bar screen.

Abstract: A mobile screening apparatus can be vibrated by two similarly-constructed vibration units that are mounted on or near the front and rear walls of the box that contains the vibrating screen assembly. Each vibration unit comprises an hydraulic motor having a stub drive shaft and a circular eccentric cam or weight carried on the shaft. The screen assembly has connections to the circular cams or weights, whereby motor rotation vibrates the screen assembly. The use of stub shafts eliminates whipping shaft motions associated with conventional elongated shafts spanning the screen assembly.

Abstract: A screen assembly for a vibratory screening machine including a frame in the nature of a plate having spaced apertures therein, spaced frame members on opposite sides of the apertures, a screen formed in an undulating shape having substantially parallel ridges with downwardly sloping sides, troughs formed between the downwardly sloping sides for conducting material which is being screened, undersides on the troughs, bonds for securing the undersides of the troughs to the spaced frame members which are located on opposite sides of the apertures, and channels at the sides of the plate for securing the frame to a vibratory screening machine.

Abstract: A vibrating screen for the sizing of granular material such as gravel, sand, crushed stone, etc., having a frame (1) and a screen body (2) supported on springs (6), directional oscillating movements being imparted to the screen body by a motor powered vibrator mechanism (3). The screen has two or more screen decks (11-13), each one divided into three component screens (14a-c, 15a-c, 16a-c) having successively decreasing inclinations in a direction towards the discharge end (9) of the screen, each lower screen deck furthermore having an increased inclination in relation to the nearest deck above.

Abstract: An agglomerator structure, used in conjunction with a sifting structure, is described to provide variable sized agglomerates and uniform agglomeration, using at least one cone, with apex pointing toward the feed flow, and an inverted cone with a screen below. The agglomerator structure is provided to enable convenient use in a sanitary environment, with the system including an agglomerator cone above the inverted cone, which defines a central opening for feeding the material to one or more screens. The system is primarily designed for use with a vibration-imparting structure to better enable use in a sanitary environment.

Abstract: A sifting screen having a rigid frame, a first woven cloth of hard wearing metal wire, stretched thereacross and secured thereto, and a second woven cloth having a coarser mesh than the first cloth and being woven from an elongate material of greater cross-section than the first, also stretched across the frame, and secured thereto, below the first cloth, to support the latter against sagging. In accordance with the invention, at least the wearing surface of the material from which the lower cloth is woven is selected to be significantly less hard wearing than that from which the upper cloth is woven, so that wear due to rubbing and vibration during use, occurs to a greater extent in the lower cloth than in the upper cloth. In one example the upper cloth is woven from stainless steel wire and the lower from phosphor bronze wire. In another example the lower cloth is of wire having a coating of an epoxy based material, or TEFLON.TM., or Molybdenum Disulphide.

Abstract: A vibrating screen unit for dewatering dredged material. The vibrating screen unit includes a frame and a top screen deck, a middle screen deck and a bottom screen deck. The middle screen deck includes a splitter which extends across the width of the frame and comprises alternating closed channels and screen rows which alternate across the width of the frame.

Abstract: An apparatus for trapping a contaminant is provided. The apparatus includes a first member having a plurality of apertures in the first member and a second member having a plurality of apertures in the second member. The second member is in juxtaposition with the first member. A space between the first member and the second member is smaller than a maximum length of the contaminant.

Abstract: This invention concerns an apparatus and method for separating particles according to size, shape, and/or density. The apparatus includes a single vibrating mechanism and a frame forming a vibrating space having classifying elements in the form of cloths, wires or bars, slopingly arranged in the space, one below the other. A collection of particles is fed through an inlet into the space, wherein the vibrating means is mounted in a transversal structure of the frame and is arranged below the inlet and well to the rear of the center of gravity of the apparatus relative to the direction of particle flow. The inlet is moved with a stroke which is more than twice as large as the motion at the center of gravity.

Abstract: A rocker bucket gold recovery system comprising a container having a plurality holes disposed thereon for drainage; a rocker coupled to the container for rocking the container; a plurality of classifying screens; and separating mechanism for separating the classifying screens when disposed within the container, thus creating a configuration adapted for effecting a separation of materials poured into the container into portions composed of essentially equivalent sized particles.

Abstract: An apparatus and process for screening a product grade of particulate matter from a feed-stream of particulate matter is provided. Specifically, the apparatus is a vibration screening action machine which vibrates, including motion having a component thereof perpendicular to the plane of the screen deck, at least one screen deck having a mesh defining the lower limit of the product grade. Such vibration screening action machine is optimized for ensuring the throughput of particulate fines through the mesh defining the lower limit of the product grade and thus substantially removing particulate fines from the product grade by setting the screen deck at a relatively low angle, as measured from horizontal, of less than 15 degrees.

Abstract: Apparatus and method for cleaning the oil off of oil covered parts by the employment of oil absorbing particulate such as ground corncob. The oil covered parts and oil absorbing particulate are mixed together in a tumbler for a period sufficient to bring each of the parts into contact with the oil absorbing particulate. Much of the particulate adheres to the oil covered parts. Thus, following mixing, the particulate adhered parts are subjected to a series of vibrating, impinging, tumbling, and air blowing actions which remove the adhering particulate from the parts and direct the oil absorbed particulate and cleaned parts into two separate, respective vessels.

Abstract: A screening plant having a feed plate located between a grizzly grate and a conveyor driven by a hydraulic motor. A first source of fluid supplies hydraulic fluid to a first cylinder to open the feed plate and to a second hydraulic cylinder to swing the grizzly grate. A second source of fluid provides hydraulic fluid to the hydraulic motor driving the conveyor and to a sequence valve at a pressure determined by the load on the motor. The sequence valve stops the flow of fluid to the second cylinder stopping the feed plate when the pressure of fluid from the second source of fluid reaches a predetermined value so that the conveyor will not be overloaded. The feed plate has to open at a preset speed and is started and stopped by the discharging conveyor, as the conveyor meets its capacity. When the feed plate reaches full open position, it activates a control that lifts the grizzly grate and dumps off large pieces of material. The grizzly grate is also controlled by the discharge conveyor.

Abstract: Each stackable screen module arrangement includes a first elongated side wall and a second elongated side wall, the side walls being spaced from each other by a plurality of cross members which extend between the side walls. The cross members also serve to support a screen. Connecting plates connect a lower one of the arrangements to an upper one of the arrangements when the arrangements are stacked to form an assembly. Each plate is connected to the top edge of a side wall of a lower arrangement and the bottom edge of a side wall of an adjacent upper arrangement. Aligned cut-outs are provided in the side walls of the lowermost arrangement and aligned cut-outs are also provided in the side walls of the second lowermost arrangement, and the two sets of cut-outs are aligned with each other to receive, support and surround the vibrator.

Abstract: This invention provides a soil conditioning apparatus having a shaker screen assembly that is mounted for operation on the dump bed of wheeled load-carrying vehicles. The shaker screen assembly may be adapted to operate either electrically or hydraulically using available systems on the vehicle and to operate with multiple soil conditioning screens to provide multiple stages of soil conditioning. The conditioned soil materials are deposited directly into the vehicle bed for transport to and dump-delivery at the site or location where it is needed, and this, without having to remove the apparatus from the transporting vehicle.

Abstract: A screen tie-down for a vibratory separator has a pedestal with a base plate and a post. The post has internal right hand threads for engaging the screen center support stud, and external left hand threads. A jam nut is threaded onto the support stud against the top end of the post. A cap having internal threads is turned onto the external threads of the post. All adjustments to the pedestal height can be made from above the screen and the tie-down cannot be overtightened.

Abstract: The size ranges of particles separated on a stack of sieves of different mesh sizes is measured automatically. The stack is clamped together and shaken as a unit to separate the respective fractions, following which the sieves are sequentially separated from the stack and inverted one at a time to dump the fraction retained on each, onto a scale. Each fraction is weighed separately and their relative proportions can be calculated automatically. In a preferred embodiment the sieves are individually cantilevered from a vertical conveyor. The sieves are inverted one by one to dump their contents by advancing them around a horizontal roll at a lower end of the conveyor.

Abstract: A vibratory screen for a vibratory screening machine consisting of a plate having a plurality of spaced openings therein, a coarse screen located in contiguous relationship to the plate, a fine screen on top of the coarse screen, a finer screen on top of the fine screen, and a topmost screen which is less fine than the finer screen and epoxy binding all of the foregoing screens to the plate at the borders of the openings. A vibratory screening machine having a tank for receiving a liquid-solid mixture, a plurality of screens of the foregoing type mounted to produce a sealed partition in the tank, an inlet conduit for supplying a liquid-solid mixture to the screens at a rate to maintain a head of the liquid-solid mixture above the screens, a vibratory motor attached to the tank to vibrate the tank, an outlet in the tank below the screens, and a liquid trap located at the outlet to thereby prevent air from entering the chamber in the tank below the screens and to draw a slight vacuum in the chamber.

Abstract: A material separating apparatus and method which comprises a frame of a pair of spaced apart generally downwardly sloping, upper and lower vibratory screening decks within the frame, the upper screening deck comprising a plurality of comb-like elements, which are generally parallel, straight finger elements removably extending from a transverse bracket support and onto which finger elements a feed material is discharged to be separated into a coarse material and a finer material. A lower deck comprises a plurality of comb-like elements having a plurality of transverse cross members and a plurality of downwardly extending, small diameter finger elements extending therefrom, the finger elements being of greater plurality and of smaller diameter than the finger elements of the upper screening assembly, and downwardly angled so as to provide for the separating and sizing of feed material falling from the upper screening deck onto the lower screening deck.

Abstract: A screening system incorporated into the system of sawdust collection for paper producing pulp. An upper and lower range of the sawdust particles is designated as between smaller, strength-inhibiting size particles and larger strength-enhancing size particles. A screen is provided to screen out the smaller size particles. The screen is made out of stainless steel to avoid rusting and corroding and also to more readily pass the moistened smaller size particles. The screen is sloped and agitated to induce shuffling of the sawdust mixture, the process of which results in a separation of about 50% of the particles as rejected smaller size particles and 50% as acceptable larger size particles desirable for paper producing pulp.

Abstract: A vibrating screen separator comprising a tuned suspension system for controlling a sifting screen and a resiliently isolated vibrator drive system for efficiently vibrating the screen cloth. The separator may be configured with stacked decks and serially connected sections involving multiple cooperating sifting planes. A rigid frame inclined above a supportive surface suspends the cloth for sifting material. The cloth is tensioned between frame sides by mounting rails, and it overlies a reinforcing subframe. The rails are tensioned by eye nuts externally accessible at the sides of the frame. Material gravitationally flows over the vibrating screen towards the discharge end. The cloth is shaken by an elongated, center strip aligned with the direction of material travel. The center strip is oscillated by the vibrator drive system disposed above it, which is coupled thereto by linkage.

Abstract: A wood chip screen system which includes a gyratory screen apparatus (10) and a disk screen (12). The gyratory system apparatus includes a top screen element (14) and a lower screen (16). The inflow end of the disk screen (12) is immediately adjacent the outflow end of the top screen element (14), while the lower screen element (16) underlies the disk screen (12) for a substantial distance. The size of the openings in the top screen element (14) may be changed by the operator to optimize the operation of the system. The openings in top screen element (14) may also vary along its length. The system produces chips within the acceptable size range, chips which are below the acceptable size range (pin chips and fines), and over-thick chips, which are subsequently typically transmitted to a chip size reduction apparatus such as a slicer.

Abstract: A feed prestratification attachment for classifying materials is configured to be secured to a vibrating screen unit so as to encourage stratification and more even distribution of the incoming feed material. The attachment includes a pair of side adapter plates separated by a horizontal mounting bar and a plurality of elongate rods affixed at one end to the mounting bar, the rods dimensioned so that the vibratory movement of the vibrating screen causes the rods to oscillate, thus permitting the rapid passage of undersize particles through the rods and the presentation of those particles to the screen, and enhancing the stratification of near-size and oversize particles.

Abstract: A screen system intended for the screening of wood chips, comprising one or several screening faces (2,3) placed one above the other as well as a bottom face (4) placed underneath said screening faces. The screening faces (2,3) are connected to members (10) that produce the screening movement. The bottom face (4) is made of a flexible material and is displaceable relative its support structure (6) so that the bottom face is deformed to prevent the adherence of materials thereto. Most appropriately, the width of the bottom face (5) is larger than the distance between the support structures (6) placed at its sides, whereby the middle portion of the bottom face (5) is hanging down lower than its sides.

Abstract: A portable screen with a raising and levelling system for raising a frame of the system containing a vibrating screen away from ground on which the system is positioned and for levelling the frame and vibrating screen for improved operation. A wheel assembly rigidly fixed relative to the frame extends from the frame at a first end wall where a first raising and levelling assembly is provided. At an opposite end wall of the frame, a second raising and levelling system is provided. First and second shedding roofs are respectively positioned over the wheel assembly and first and second hydraulic raising and levelling assemblies. With the portable screen having a raising and levelling system as disclosed, the system may be operated on sloping ground and/or ground having undulations and other protrubances.

Abstract: A mixture of two sets of similarly sized particles having different terminal velocities in a separation liquid is separated. This is done by removing either the smaller particle portion of the set having the greater terminal velocity, or the larger particle portion of the set having the lesser terminal velocity, or both, for example, by sieving. The resulting mixture is introduced into a tube in which the separation liquid is flowing upwardly. This eliminates intermixing of the fines of one set with the larger particles of the other set. The flow of liquid in the tube can be arranged to provide laminar flow separated by two regions of turbulent flow to improve separation of particles. Anion and cation exchange resin particles can be separated in this manner, regenerated and returned to service.

Abstract: A material classifying apparatus for separating material into at least overs and fines. The apparatus includes a material receiving housing supporting one or more vertically spaced separator screens. When more than one separator screen is used, the lowermost one of the screens has a finer mesh than the uppermost one of the screens. The apparatus will then further include a discharge opening associated with the periphery of the uppermost one of the screens for discharging overs from the material receiving housing, a discharge opening associated with the periphery of the lowermost one of the screens for discharging product from the material receiving housing, and a discharge opening disposed below the lowermost one of the screens for discharging fines from the material receiving housing.

Abstract: Disclosed is a vibratory screening machine comprising a frame, a pair of screens with meshes of different size, mounted within the frame one above the other, pushers formed by double-arm levers located in the interscreen space and hinged to a support, and vibrating drives for imparting vibrational movements to the pushers. The arms of each lever are made of different length and make contact with different screens, the longer arms contacting the screen with larger-sized meshes.

Abstract: A vibrating screen which comprises a housing having screening surfaces, the surfaces forming an angle with respect to each other, and vibrators. The housing consists of separate sections having screening surfaces arranged, one underneath the other, inside of each section. Each section is suspended to a frame by means of flexible joints. Vibrators are mounted to each section. The screening surfaces of the separate sections are arranged at different inclinations and have different widths in the downward direction of motion of the material passing through the vibrating screen device.

Abstract: A vibratory screening machine comprises a frame, at least two screens with meshes of different size arranged in the frame one above the other, pushers hinged to a support in the interscreen space, and vibrating drives for imparting vibrational movements to the pushers. Each pusher is formed by two levers hinged each, at one end to the support, the other end of each lever making contact with one of said screens, and an elastic element being disposed between the levers.

Abstract: Disclosed is a vibratory screening machine comprising a frame, a pair of screens mounted in the frame one beneath the other, electromagnetic vibrating drives, and two sets of pushers. Located in the frame are stops rigidly secured in relation thereto. The pushers of the first set are connected to the vibrating drives and make contact with the screen closest to the drives. The pushers of the second set are positioned within the guides in alignment with the pushers of the first set and spring-loaded against the stops in the direction of said pushers of the first set.

Abstract: A screening machine with two driven systems driven in circular oscillation by means of at least one eccentric shaft. The shaft is mounted on both frames simultaneously which are separated from one another and each of the frames comprises a plurality of crossmembers fastened parallel to one another to the respective pair of uprights. The crossmembers of the respective frames, lying in a respective screening plane, alternate with one another and are driven by the systems in a way resulting in a stretching and contracting motion of an elastic screen fastened to the crossmembers and, consequently, the screen material is cast from the surface of the screen.