Abstract: A portable trommel has a chassis, including support wheels at one end thereof for movement of the trommel. A trommel is rotatably mounted on the chassis and has an input and an output end. A hopper and an input conveyor, for supplying material to be screened to the input end of the trommel, are mounted on the chassis adjacent the input end of the trommel. An output or fines conveyor, for collecting material passing through the trommel screen, is mounted on the chassis, below the trommel. A stockpiling conveyor is mounted on the chassis and has a lower end adapted to receive screened material from the fines conveyor and an upper end for discharging screened material to form a stockpile. The stockpiling conveyor can be in two parts, which can be folded into a retracted position for storage and transportation, and further can be mounted for rotation about a vertical axis to enable an arcuate storage pile to be formed.

Abstract: A fractionator for fractioning a suspension in at least two fractions, including a drum rotatable about a substantially horizontal access and having axially spaced end walls, a centrally arranged inlet for suspension, a flow channel for suspension in the drum, and outlets for fractions. The flow channel extends from the inlet back and forth between the end walls of the drum and radially outwards towards an outlet for the at least two fractions. Preferably the flow channel is defined by substantially concentric cylindrical walls of which every second wall is alternatively tightly connected to one or the other of the two end walls. The fractionator is useful in a continuous fractioning process.

Abstract: A beansprouts roots, husks, cleaning machine is disclosed. The machine has an internal spiral (7) and external spiral (6) in opposite directions mounted on the perforated cylinder (3) with integrated grouts bearings (8) driven by a motor rotating inside a casing cylinder (1). When the unclean sprouts are loaded by the given direction into the rotating perforated cylinder (3); causing by the rotating cycle, the roots are broken and the husks separated which then gets through the holes (4) into the gap (5) between the rotating cylinder (3) and casing (1), pushing out in one direction by the external spiral (6) as by-product. The clean sprouts are being pushed out by the internal spiral (7) in another direction as products. The machine can be used as a single or double, even multicylinders to clean the roots and husks and in different quantities of product in demand.

Abstract: The invention is a screening apparatus for classifying material of different sizes. A screen is rotatably mounted on a frame for rotation around a first axis which is angled upwardly away from the horizontal, at an angle of from 0 to 30 degrees. The screen is symmetrical about the axis and has an open upper inlet end and a lower outlet end. The screen has a cylindrical portion extending from the inlet end towards the outlet end, having a diameter larger than its length, and a conical portion extending from the cylindrical portion towards the outlet end, tapering inwardly to a central outlet opening, the lowest point of the outlet opening being substantially higher than the lowest point of the screen. The frame is pivotally mounted on a trailer for pivoting about a longitudinal axis near a lower side edge of the trailer. The open inlet end of the screen faces one side of the trailer.

Abstract: A rotary screening device is disclosed which includes a rotating cylinder having an inlet end, an outlet end and a cylindrical wall formed at least partly from the screening surface. The cylinder is rotatably supported on wheels which are in turn mounted within a trough-shaped spray shield having sides formed from a single unitary blank of metal, and which extends about the lower radial surfaces of the cylinder wall, functioning as the screening device frame.

Abstract: A trommel separator includes a clutch mechanism that operates with a shaft mounted right angle gear reducer for direct drive of the drum and a flexible mount. The clutch mechanism has a clutch slip disk which is located between first and second disks. The first disk receives the torque from the shaft mounted gear reducer which is then transferred to the second disk, which is rigidly connected to a rotating drum, when the first and second disk are pulled together. A clutch regulating system, namely jam nuts and a spring coil, are connected to the first and second disks through shafts for pulling the first disk and the second disk together. The flexible mount has a mount which rests upon a pivot plate for rotating the mount around a vertical axis. A first and second plate is attached to the gear reducer and horizontally rotatable within the mount. Clips keep the mount from lifting off a frame and spacers prevent the clamping of the mount. Pads are also used to prevent wear of the clips.

Abstract: A rotary screening device is disclosed which may be advantageously used to increase the solid content of influent. The apparatus includes a rotating cylinder having an inlet end, an outlet end and, depending on the material to be screened, a cylindrical wall formed at least partly from a screening surface, such as a woven wire mesh screen. The cylinder is journalled for rotation about its central axis, which may be either in a horizontal position or inclined up to 40 degrees from horizontal towards either the inlet or outlet end. Each end of the screening cylinder has its lowermost portion covered to restrict outward movement of the influent from the cylinder and maintain a minimum layer of retained solids therein.

Abstract: A method for treating solid municipal waste material including placing solid municipal waste in a rotating chamber having an interior at ambient pressure, heating the waste at ambient pressure, and controlling the moisture content of the waste.

Abstract: A counterflow aggregate recovery apparatus for separating and retrieving material. The recovery apparatus includes a rotatable drum in which a cylindrical screen is suspended. The material to be processed is introduced into the cylindrical screen. The screen permits the passage of material smaller than the openings defined by the screen. The material which passes through the cylindrical screen is received within an annular volume defined between the cylindrical screen and the drum wall. A first material conveyor moves the material received within the annular volume such that the material is discharged from the second end of the drum. A second material conveyor moves the material retained by the cylindrical screen to the first end of the drum and discharges the material from the first end.

Abstract: An animal litter box is disclosed for automatically separating waste materials from animal litter. A rotating cylinder is provided with an internal surface for receiving the animal litter and waste materials. A perforated surface has one end fixed to the internal surface of the rotating cylinder so that as the cylinder is rotated, the animal litter and waste materials fall onto the perforated surface. The perforated surface includes openings sized to permit the animal litter to fall through the perforated surface and sized to capture the waste materials upon the perforated surface. A collection assembly is coupled to the perforated surface so that as the rotating cylinder continues to rotate, the waste materials supported on the perforated surface are guided to the collection assembly and are thereafter conducted to a waste reservoir. After the rotating cylinder has been rotated 360.degree.

Abstract: A tandem waterwheel type trommel apparatus having a laterally-disposed drain-off drum and a laterally-disposed classifying drum combined through a short pipe to form a main body, which is rotatably disposed on a base and is connected to a drive unit. A front end plate and a rear end plate each having a doughnut-like shape are respectively provided at the front and rear ends the drain-off drum. A plurality of buckets are provided in the drain-off drum, and gutters are provided on the back side of upper end portions of the buckets. The gutters communicate with drain holes formed in the rear end plate. A fixed shoot is provided which extends through the drain-off drum to the classifying drum. The classifying drum has a cylindrical portion and a truncated-cone portion. A circumferential member of truncated-cone portion is made porous while a circumferential member of the cylindrical portion is formed of a wire netting. A screw is provided on the outer circumferential surface of the cylindrical portion.

Abstract: An adjustable orifice trommel having an elongated body rotatable about an axis, an entry for insertion of particulate material, and an exit for retrieving screened material. The trommel includes a plurality of flat inner plates, each inner plate having a plurality of openings. An outer plate is provided for each inner plate slidable axially in relation to the inner plate, each outer plate having a plurality of openings matable with the inner plate openings so that moving the outer plate with respect to the inner plate will vary the size of the orifices.

Abstract: A rotary filter for filtering water out of water containing raw material such as fish guts and muds including a screw drum having a number of filtering holes formed therein and a screw having a shaft and a spiral vane secured to the outer surface of the shaft, in which the screen drum is arranged rotatably, the screw is arranged within the screen drum rotatably relative to the screen drum, and the screen drum and the screw are rotated by means of separate driving sources independently from each other. A period of time during which the water containing raw material is remained within the screen drum can be adjusted at will regardless of the rotation speed of the screen drum. Therefore, the screen drum can be rotated at a high speed while the raw material can remained within the screen drum for a long time period, so that the water filtering efficiency can be increased.

Abstract: Apparatus for continuously separating relatively coarse particles from a suspension of a mixture of particles in a liquid, wherein the suspension is caused to pass through a screening medium which is rotating in its own plane and wherein the screening medium extends over and across the upper end of a rotary drum having generally downwardly depending side walls and wherein the side walls diverge outwardly in a downward direction.

Abstract: The present invention is a vehicle-mounted trommel screening apparatus. A rotating trommel screen cage having an open front and a closed back is mounted on the vehicle so that the open front of the trommel screen cage is at a side of the vehicle and is adjustably tiltable about the vehicle side while the cage rotates. A conveyor is mounted below the trommel screen cage to convey material rearwardly off the end of the trailer. A push plate folds down below the trommel to assist in loading material that has been discharged from the front. Axially extending gussets within the cage provide additional lifting and tumbling action. Material is dumped into the trommel screen cage with the cage tilted back from the open end. The rotation of the cage causes a tumbling action which simultaneously breaks up larger pieces of material and screens smaller material to the conveyor below the screen. Material retained in the trommel screen may be dumped by tilting the trommel screen cage forward toward the open end.

Abstract: An apparatus for separating materials into different sized particles, especially difficult materials that may contain wet or sticky particles or lightweight foreign material. The material is separated by feeding it into a dish-shaped unit open at the top with screen material along its sides and bottom. The unit is rotated about an inclined axis so that the open top faces upwardly and toward the front. The material to be separated is placed into the unit, and the unit is rotated so that the material rolls on itself across the bottom and up the sides with the smaller particles moving downwardly where they pass through the screened sides and bottom as the unit rotates over a conveyor. The larger particles exit through the open top of the unit. The apparatus also includes a unique way of providing for the screen medium.

Abstract: The screening assembly includes a tilted upwardly movable belt conveyor over which is mounted a rotatable cylindrical drum axially oriented in the direction of the belt conveyor. A mixed soil receiving bucket mounted over the conveyor upstream of the cylindrical drum. The bucket is also transports a mixture of soil and debris towards the cylindrical drum. The cylindrical drum while rotating allows the soil to drop on the belt conveyor while the debris are rejected at the lower end of the drum. The assembly particularly makes use of a screening drum which includes a cylindrical meshed screen supported by two end rings at both ends of the meshed screen. The drum is rotated by a pair of driving wheels located under each of the rings. One of the rings includes an outer radial flange which is adapted to abut on a pair of wheels for preventing the tilted drum from sliding downwardly.

Abstract: A mobile screening apparatus includes a horizontal rotary drum preferably fed by underflow from a prescreening device that is reversible endless belt of screening grizzly bars. The belt reverses for expelling oversize material caught between bars. Force needed to turn the drum is monitored, as a way of controlling drum feeding by the prescreening device, for preventing protracted over-filling of the drum. The screening drum includes an outer peripheral cage of longitudinal bars, at least some of which preferably are movably mounted. A set of wires is circumferentially wrapped about the bar cage, with sufficient flexibility to permit the wires to locally elastically flex away from the bars sufficient to pass slightly oversize material and facilitate cleaning of debris lodged in spaces among the bars and wires. Brushes help dislodge lodged debris.

Abstract: The present invention is a device for separating semiconductor grade silicon pieces into desired size ranges, while minimizing contact contamination of the separated pieces. The device employs a rotatable cylindrical screen, with contact surfaces of semiconductor grade silicon. In a preferred embodiment, the cylindrical screen consists of parallel rods of semiconductor grade silicon separated by semiconductor grade silicon, internal, spacers. In addition, external spacers of semiconductor grade silicon are arranged along the length of the parallel rods to further define the exclusion characteristics of the cylindrical screen.

Abstract: The present invention relates to an apparatus for sorting elongate produce comprising a drum constituted by longitudinal grids, stationary and movable bars of which are mounted transversally to the longitudinal axis of the drum, the movable bars of each grid being kept in a fixed position one with respect to the other at constant and identical distances through a frame which is able to be moved relative to the stationary bars in a direction parallel to the longitudinal axis of the drum.

Abstract: The present invention is a process and an apparatus for efficiently separating fine bones from fish flakes wherein fish flakes are dispersed after dehydration or dehydrated after dispersion, and separated using a sieve with a plate with slits formed thereon.

Abstract: A method and apparatus are disclosed for padding a pipeline lying in a ditch by separating fine particles from coarse particles in the material excavated from the ditch and windrowed along the side of the ditch comprising moving a frame supporting a rotating separator drum at the desired distance above ground to engage windrowed material at the level required to obtain sufficient fines to pad the pipeline while rotating the separating drum to separate the fine and coarse material and conveying the fines laterally into the ditch.

Abstract: An aggregate collecting apparatus. A meter which measures the gross weight of the rotary drum is linked to the speed change gear for the rotary drum in such a manner as to be operationally connectable therewith so that the speed of rotation of the drum can be varied in accordance with variations in the amount of sludge charged in the drum. The upstream and downstream edges of a trommel in the rotary drum are intermittently twisted in each of opposite directions so that gravel clogging the trommel is automatically removed.

Abstract: A filtering device is provided for solid wastes which includes a rotating drum having longitudinal rows of separating holes located through its outer surface. Plates are located between these rows and extend from the drum at a predetermined height in proportion to the radial dimensions of the holes. The plates can be continuous of discontinuous and can extend either perpendicularly relative to the drum or slightly inclined relative to the drum in a direction opposite the rotation of the drum. If desired, transversely extending plates may also be employed. The plates prevents clogging due to the phenomena of winding wherein fibers exit a hole and re-enter another hole as the drum rotates.

Abstract: An apparatus for screening a suspension of fibrous cellulose material containing undigested wood comprising a shaft rotating in a housing and an elongate screen disposed in a screening chamber. This screen comprises a stationary screening member and a rotating screening member connected to the shaft. Each of the screening members comprises a plurality of parallel rings disposed with predetermined axial distance from each other to form circumferential openings, the rings of the stationary screening member and the rotating screening member being arranged to partially close each other's openings between the rings to define circumferential screening gaps therebetween. According to the invention the stationary screening member is in the form of a unitary body rigidly connected to the housing so that at least circumferential movement is prevented. The rotating screening member is likewise in the form of a unitary body but it is connected to the shaft for common rotation therewith.

Abstract: A rotary grid-structure bucket for separating fine and coarse constituents of sizable materials or products, has a bucket (3) with a separating part (9) located between its back (7) and its front (8) and sides provided with apertures to allow fine constituents (4) of the sizable materials or products (6) to pass therethrough. To make it possible for the separating part (9) to be exploited in its entire length the sides of the separating part diverge symmetrically with respect to the axis of rotation (R) in a forward direction. Ahead of the separating part (9) the bucket has a front part (25) whose sides diverge around the axis of rotation (R) in a forward direction in a lesser degree in relation to the axis of rotation (R) than the sides of the separating part (9) or extend in parallel with the axis of rotation (R) or converge in relation to the axis of rotation (R).

Abstract: A separating drum, having a multiple of cylindrically shaped separating elements, which are arranged parallel to the axis of rotation of the drum is provided with an arrangement by which a single part can be moved to form an adjustable separating slot. The separating drum includes separating elements which are firmly connected in pairs respectively by at least one carrier element, which is provided on one of the front faces of the separating elements. The carrier element can be rotated around the axis of a cylindrically shaped separating element situated on the circumference of the drum. Further, an adjusting wheel is provided which can be driven by a circulating adjusting element for setting the separating slot, the adjusting wheel having an axis of rotation on at least one of the front faces of the stationary separating element.

Abstract: A centrifugal filter separator includes a detachable tubular screen disposed between an annular filter and the inner peripheral surface of a basket, the screen having an annular flange detachably connected to an open end of the basket from the outside of the basket. The centrifugal separator having such detachable screen is applicalbe to centrifugal separation of various materials.

Abstract: A grain cleaner and method for cleaning grain is the subject of the present invention. A single rotatable drum presents a substantially continuous screen surface of increasing mesh size from one end to another with the drum having an inlet end and an outlet end. A plurality of baffles are disposed in spaced apart relationship along the periphery of and along the length of the screen surface of the drum for retarding the flow of material therethrough. Retaining means is provided in the vicinity of the outlet end of the drum for retarding the flow of foreign material fromthe drum while accommodating the eventual passage of foreign material out of the drum. The drum is rotated by any conventional power source.

Abstract: A wood chip sorter comprises a shell (22) which at least partially defines a substantially cylindrical sorting chamber (26) into which wood chips are introduced. The shell (22) has a plurality of rotatable shafts (28) mounted thereon with the axes (72) of the shafts (28) being circularly arranged about a central axis (24) of the shell (22). Each shaft (28) has a plurality of discs (80) mounted at spaced intervals thereon with discs of adjacent shafts (28) intermeshing radially to form essentially axial spaces (84) therebetween. A drive and transmission system (30) revolve the shell (22) about the central axis (24) of the shell (22). A planetary gear system (32) facilitates rotation of the shafts (28) about their axes (72) as the shell (22) revolves. The discs (80) are shaped to have greatest axial width at central portions thereof, and taper to a lesser axial width at their circumference. The discs (80) are formed from an abrasion-resistant material.

Abstract: A screening machine has a rotating screening drum for screening dirt or other material to a desired size through the screen openings, and is made so that it reduces clogging of the screen, even when rocks, dirt clods, and moist dirt is being screened. The rotating drum has interior brushes and a beater bar for keeping the material moving on the interior of the drum. A holding bin and feeding conveyor is used at the input end of the machine and is positioned to empty into an input pulverizer or shredder, that has a powered drum that will break the dirt clods up. The holding bin has a cover grate to remove excessively large rocks and the like. The output from the pulverizing roller also drops material onto a grate through which the material passes before reaching the screening drum. These grates are called "grizzly bars" and help in the classification process. The screening drum can be converted to a mixer drum by lining the screen wall with sheet metal and removing the normally used interior brushes.

Abstract: A locking structure of wire rod for filter element, which comprises perforating a locking hole larger than a sectional area of the wire rod near both ends or either one end portion of a cylinder with a passage leading in and out provided thereon, inserting an end portion of the wire rod in the locking hole, fixing mechanically the end portion of the wire rod by pushing forcedly in on a wedge. It is further intended that the wire rod is particularly formed triangularly in section, a threaded groove angled same as the top is formed to a desired slit on an outer peripheral surface of the cylinder, the surface on which the wire rod is wound is made even peripherally, thereby functioning effectively as surface filtration and surface separation.

Abstract: This inventions's method separates from excavated materials (2) fine constituents (3), preferably topsoil, and coarse constituents (4), preferably stones, roots or root crops. The materials to be excavated (2) are excavated by an excavating and separating bucket (11), of grid structure, which is subjected to separating movements causing the fine constituents (3) to escape from the excavating and separating bucket (11) through apertures provided for that purpose. To produce shock-free separating movements the excavating and separating bucket (11) is rotated continuously through one or preferably a plurality of revolutions in the same direction of rotation (R).A simple apparatus for carrying the method of the invention into effect is described. The excavating and separating bucket (11) is a unit (5) connected to an excavating and elevating assembly (8) on a vehicle (9).

Abstract: A process and apparatus are disclosed for recovering and cleaning contaminated particulate abrasives blast media for reuse. A first vacuum system vacuums up spent contaminated blast media from a work site and entrains it in an airstream. The entrained contaminated media is then projected onto a target surface that absorbs momentum of the contaminated media such that media and contaminates at least equal in weight to the media drop out of air suspension while contaminates lighter in weight than the media substantially remain in suspension. The contaminated media that drops out of entrainment falls into a rotating drum having apertured cylindrical wall surfaces that permit blast media to pass therethrough while retaining oversized contaminates. The rotating apertured drum is contained within a housing that is evacuated to substantially remove the lighter weight contaminates from the housing and, hence, from the media.

Abstract: A centrifugal drier drum for wet granular material has a peripheral drying wall arranged for rotation about its axis and an entry part for receiving the material to be dried and directing this material to within the drum. The entry part is fixed to the wall of the drum by a number of supports. Material fed to the drum impacts the entry part at an impact zone, and is received within the drum at a projection zone. An annular retaining space for retaining the material to be dried is formed at both the impact zone and the projection zone such that the circulating material strikes the surfaces of material retained in these retaining spaces.

Abstract: A rotating grizzly having a downwardly slanting axis of rotation for reducing the size of agglomerated mineral particles comprising a rotatable framework made up from a series of spaced axial baffles interconnected by a series of parallel spaced bars wherein the baffles extend inwardly toward the axis of rotation a greater distance than the bars.

Abstract: Apparatus for the separation of the reusable part from the unusable part of granular form filter material from filter equipment, particularly granular form activiated charcoal, comprising a base frame; a sieve drum for sieving of the granular form filter material rotatably mounted on the base frame; means for driving the seive drum; and means for pneumatically withdrawing the granular form filter material from the filter equipment and supplying the filter material to the sieve drum.

Abstract: An apparatus for drying fruits, berries, and the like, including a helical drum for supporting berries in its interior. Each turn of the helical drum is in parallel spaced-apart relation to the adjacent turns, and the spacing between turns is smaller than the diameter of the fruits or berries being dried. The drum is mounted on a frame for rotation about its longitudinal axis, and a fan is mounted inside the helical drum to provide a drying current of air outwardly between the turns of the drum. Berries which are introduced into the interior of the drum are supported between and on the turns of the helix, and as the drum rotates, the berries are moved down the drum and through the drying current of air.

Abstract: This invention relates to an improved device for separation of sprues from molded pieces, comprising a substantially cylindrical drum element open on both bases, slanting and rotatably carried; the bases, comprising rings with rollers located at an adjustable distance from one another engaging thereon, provide sets of rollers arranged on different diameters to prearrange a passage zone for the pieces and risers or sprues to be separated.

Abstract: Apparatus for cutting of bags containing tricklable materials, as well as for separating the goods from bag parts, with a sieve drum and separate outlets for the bag parts, oversized particles, and the goods to be discharged, comprising a bag guidance with a floor inclined in dependence of the load, in a quasi-uniform, upper-and-lower engagement of the cutters to the bag, the cutters being coaxially and peripherally aligned with respect to one another, as well as for a uniform fragmentation and distribution of the goods to be discharged over the length of the sieve drum through accumulation rings.

Abstract: A sorting device for sorting out a multiplicity of pieces such as tickets according to their size, comprises a cylindrical sorter drum rotatably mounted in a frame for storing therein pieces having different sizes to be sorted out, means on the sorter drum including openings for passing therethrough pieces of a particular size only; and a motor for rotating the sorter drum about its own axis to cause the pieces of the particular size to be discharged through the openings out of the sorter drum.

Abstract: A method and system are provided for separating low and high density particles from a mixture thereof. A foam is continuously generated and carried on the outer surface of a horizontal drum. The mixture of particles is deposited on top of the foam surface near the apex of the drum so that the dense particles fall through the foam while the less dense particles are supported on the upper surface of the foam. A first blade is provided to shear the upper surface of the foam and remove the less dense particles. A second blade engages the surface of the drum downstream from the first blade to remove the relatively dense particles. The system finds particular use in separating raisins (dense particles) from waste materials associated with raisins (less dense particles).

Abstract: A low cost, manually operated, popcorn kernal separator. The separator includes a support stand and a perforated drum with a lid enclosing a front opening and the access of the drum mounted angularly with respect to the horizontal leg of the support base. The perforated drum also serves as a serving bowl for popped corn therein.

Abstract: Method and apparatus are disclosed for recovering blowing wool from an air stream by introducing the stream out aa drum rotating in a sealed shroud, the speed of rotating be adjusted in response to the pressure differential across the surface of the drum.

Abstract: A double drum vacuum filter with drums positioned parallel to one another with a gap therebetween and rotating in opposite directions with suction applied within the foraminous drums to remove filtrate from a solid which forms on the surface with tapered extraction tubes within the drum angled at an angle greater than 90.degree. relative to the drum surface and with stripping devices disposed on the downrunning side of the drums below the center thereof.

Abstract: A size grader for pod vegetables includes a horizontally oriented rotatable drum which contains banks of fixed grading members and movable panels oriented over each bank. The banks and panels are wanted on the drum so as to be parallel to its longitudinal axis. The final grading members and the movable panels have grading vanes which are disposed circumferentially to the drum and transversely to its longitudinal axis. The apertures between the fixed grading vanes and the movable vanes defines grading surfaces. A control rod mounted to the drum longitudinally across each row of panels and operatively engaged with a rowring enables movable panel to move selectively with respect to its corresponding fixed panel as the drum rotates so that the movable panel moves toward the fixed panel in grading position when the panel is in a lower level in the drum and moves away from the fixed bank in a clearing position when the panel is located above the drum.

Abstract: A rotary sieve comprises, in an elongated housing, a body which is rotatable about a substantially horizontal axis and has, at one end, a frustopyramidal drum widening in the direction of the other end and a zigzag tube communicating eccentrically with the drum. The planar walls of the drum and the tube are perforated sieves and the material is introduced by a worm centrally into the drum and is progressively advanced through the body to be discharged generally centrally from the tube through a discharge drum of the body which is peripherally open so that the material can be collected by a pipe underlying the discharge drum.

Abstract: A screen drum and a method for its manufacture is disclosed wherein the screen drum comprises at least two cylindrical screen members spaced apart, between which a stiffening ring is disposed. The stiffening ring has two cylindrical surfaces which guide the ends of the cylindrical screen members, and a projecting part between them. The cylindrical screen members and the stiffening ring are attached to each other by a weld joint connecting the projecting part of the stiffening ring and the ends of the cylindrical screen members and filling the gap between them.

Abstract: Mixed solid waste, such particularly as municipal waste, is subjected to treatment which separates the majority of the ferrous metal pieces from the other solids, and the invention provides apparatus for separating the resulting mass into (a) flat-shaped pieces (b) chunky-shaped pieces, and (c) long thin or otherwise oversized pieces by causing all the pieces to advance along a moving conveyor surface through successive stations at which openings of predetermined size and shape accept pieces of the (a) and (b) shapes, having only the (c) category on the conveyor.

Abstract: A screening machine has a rotating screening drum for screening dirt or other material to a desired size through the screen openings, and is made so that it reduces clogging of the screen, even when rocks, dirt clods, and moist dirt is being screened. The rotating drum has interior brushes and a beater bar for keeping the material moving on the interior of the drum. A holding bin and feeding conveyor is used at the input end of the machine and is positioned to empty into an input pulverizer or shredder, that has a powered drum that will break the dirt clods up. The holding bin has a cover grate to remove excessively large rocks and the like. The output from the pulverizing roller also drops material onto a grate through which the material passes before reaching the screening drum. These grates are called "grizzly bars" and help in the classification process. The screening drum can be converted to a mixer drum by lining the screen wall with sheet metal and removing the normally used interior brushes.