Abstract: A reversible downdraft rotary hammer mill for processing waste material in which breaker plates and a grate assembly are cooperatively arranged so the terminal ends of the grate assembly are laid back to form with the adjacent terminal ends of the breaker plates, when a terminal end of one breaker plate is opened relative to the tip circle of the rotary hammers and the other breaker plate is closed up to be adjacent the hammer tip circle, a tapering wedge shaped space for the opened breaker plate and a crushing surface for the closed up breaker plate. The cooperation of the breaker plates and the grate assembly enables the processing of a high volume of lightweight and fluffy material while avoiding plugging of the mill inlet.

Abstract: Helix apparatus fastened to the end flanges on a rotatable beater in a granulator for reducing the size of particles is provided to direct the granular particles from the opposing ends of the beater inwardly toward the central portion to reduce the amount of particles escaping through the opposing end walls of the granulator.

Abstract: For the rapid replacement of an outlet grate in a crushing machine and for adapting the crushing operation to different types of materials, an outlet grate is located within the crushing machine housing extending generally horizontally between a pair of opposite walls. An opening is provided in at least one of the opposite walls in the region of the grate and the grate can be removed in whole or in part through the opening.

Abstract: A granulator for comminuting scrap material has an improved rotor blade assembly. The granulator is of the type having a pair of spaced-apart, parallel bed knives mounted stationarily in the granulator. An arcuate perforated screen is mounted below the bed knives for the passage of comminuted material through apertures in the screen. A rotor axle is mounted between and parallel with the bed knives. At least one blade is mounted on the axle for rotation with the axle. The blade has a peripheral contour with a plurality of spaced-apart cutting tongues extending outward. The cutting tongues define a circular path closely spaced to the bed knives and screen for shearing scrap.

Abstract: The hammer mill comprises a horizontally arranged grinding chamber (1), at the periphery of which several supply ducts (4) with an inlet (7a) for the coarse material to undergo size reduction are distributed, each supply duct (4) being associated with a corresponding adjacent discharge duct (5) with an outlet (7b) for the product of reduced size. The inlets (7a) and the outlets (7b) are alternately arranged and uniformly distributed over the periphery of the grinding chamber and the grinding chamber (1) is thereby subdivided peripherally into a corresponding number of mill segments which are each defined by a supply duct (4) with an inlet (7a) and an associated discharge duct (5) with an outlet (7b). A special feed proportioning apparatus is provided with coaxial cells (21, 22) and several proportioning screws (23) so as to continuously provide the supply ducts (4) of the hammer mill with various coarse materials from corresponding cells (21, 22).

Abstract: Sanitary articles formed of cellulose flock and non-flock carriers or covers are shredded by rotating entrainers, which are arranged in an enclosed housing. The cellulose flock thus separated is removed from the housing under suction through a sieve which only allow the cellulose flock through. The removal is effected before the covers have been shredded to such an extent that they pass through the sieve. The shredded cover material is then removed separately.

Abstract: A paper shredder includes a stator housing on which stator blades are adjustably mounted and a rotor assembly on which rotor blades are securely attached. As the rotor turns within a comminuting chamber, the rotor blades and the stator blades provide a scissors-like cutting action. The stator blades are fixed onto the stator housing with their cutting edges aligned in parallel with the axis of rotation of the rotor assembly. Each rotor blade lies in a plane which is skewed with respect to the axis of rotation, and the cutting edge of each rotor blade is substantially concentric with the axis of rotation. In the preferred embodiment, the rotor and stator blade assemblies are enclosed by three sizing screen quadrant sections. One quadrant section remains open for receiving paper into the comminuting chamber. The paper remains inside the comminuting chamber until it is small enough to pass through the openings of the sizing screen.

Abstract: A pulverizing mill is disclosed, suitable for wet or dry foodstuffs, chemicals, plastics and pharmaceuticals, having a reversible welded multi-bladed rotor which is substantially seamless and crack-free so as not to catch and retain particles of the material being pulverized. The rotor blades are supported parallel to the rotor's central axis in a picket-fence configuration in which blade position are staggered from one rotor segment to the next whereby the entire rotor shaft internal volume is swept by one or more blades during each revolution. The blades are supported at predetermined points which raise the rotor maximum safe operating to achieve a higher output of pulverized product. The mill inlet housing is attached by quick-release toggle fasteners associated with fiber-optic sensing means to prevent mill operation unless the housing is fully secured in one of two proper operating positions.

Abstract: A hammer mill for treating scrap metal including a rotary hammer means for delivering impact blows to scrap metal is shown. Discharge grates are provided for disposing of the scrap metal through discharge outlets for the hammer mill. The rotor is a disc type with rotating hammers located on pins extending through the discs. A plurality of caps are circumferentially located around each disc and attached thereto for protecting the disc against excessive wear. A dual feed roller feeds the scrap metal to the hammer mill to be shredded.

Abstract: A cleaning device is provided for use with sizing screens in material reduction apparatus, such as crushers, pulverizers and shredders. The cleaning device automatically clears obstructions from the openings in a screen. The preferred embodiment of the cleaning device includes a rake connected to a carriage assembly. The carriage assembly includes a wheel and rail system. The tines of the rake extend upwards into the openings of the screen. When the wheels move along the rail, the rake tines travel along the openings in the screen, forcing any obstructing material into another portion of the material reduction apparatus. The rake is actuated manually, periodically at predetermined intervals or in response to a sensed reduction in flow.

Abstract: A machine for shredding material comprises a base, a shredder body selectively rotatably mounted on said base, and hinges associated with the shredder body and adjustable between a first position and a second position for selectively securing the shredder body to the base wherein the shredder body is fixed to the base when the hinges are in the first position and the shredder body is free to rotate in the base when the hinges are in the second position. The shredder body is provided with static counter-blades. A shredder rotor is rotatably mounted within the shredder body for rotation relative to the shredder body when the hinges for securing the shredder body in place are in the first position. The shredder rotor is provided with cutting blades which cooperate with the counter-blades on the shredder body when the shredder rotor rotates relative to the shredder body for shredding the material.

Abstract: A paper disintegrator comprising a rotor to be fed from above with material to be disintegrated and having a horizontal axis, and an outlet grating disposed beneath the rotor is to be improved in such a way that it can disintegrate material of varying types to a predetermined degree of fineness on each occasion with the most favorable possible efficiency and, with the rotor running, can also be rapidly adapted to changing requirements. The discharge grating consists of two halves, which substantially surround the lower rotor half and which can be pivoted laterally outwards within the casing about grating axes extending horizontally approximately at the level of the rotor axis.

Abstract: The invention relates to a cutting mill for the comminution of runners, injection moulding parts, blown moulding parts and so forth in operation of a synthetic material processing machine. Waste or reject parts becoming available should, if possible, be led back again to the process cycle of the machine after comminution to granulated size for use as a regenerate. For this purpose one makes use of a cutting mill having a cylindrical driven rotor mounted in a housing, over the periphery of which rotor a plurality of adjacently positioned cutting element groups are arranged, which cooperate with at least one stationary blade provided in the housing, wherein a sieve for filtering of the comminuted material extends over a part of the boundary of the rotor.

Abstract: A hog granulator for plastic material in which a plurality of longitudinal knives are arranged on a rotor inside a cutting chamber to engage in a cooperative cutting action with bed knives on the cutting chamber walls. A plurality of spaced, longitudinal pockets in the peripheral surface of the rotor bring cooling air to the cutting surfaces, and ribs are arranged across these pockets to reduce power requirements by preventing excessively large pieces of plastic material to be reduced from being received into and taking up residence in these pockets.

Abstract: In a separating device for a wood chipper comprising a chipper rotor housing and a chipper rotor rotatably journalled therein it is proposed in accordance with the invention to provide the separating device with a plurality of ribs defining between themselves spaces through which wood chips of a predetermined maximum size and less are passing to an outlet of the chipper rotor housing. Each rib has an arc-shaped edge facing the chipper rotor with a radius which has its center coincident with the axis of rotation of the chipper rotor, said edge being arranged at a predetermined distance from the cylindrical surface of the chipper rotor in order to form a free passage for pieces of material which are larger than the desired maximum size of discharged chips.

Abstract: In order to enable the setting of the inlet funnel of a wood chipper to different positions for adaptation to prevailing operating conditions including the type of material to be chipped, it is proposed in accordance with the invention that cooperating bearing means be arranged on the chipper rotor housing of the wood chipper and on the frame supporting the chipper rotor housing so that the chipper rotor housing and the inlet funnel are pivotal around the axis of rotation of the chipper rotor.

Abstract: This invention is directed to a new and improved animal bedding comprising newsprint subdivided into a range of particle sizes. The bedding provides the necessary liquid absorbence and resistance to compaction without excessive dust. The invention is directed also to the process and hammermill apparatus for preparing said bedding.

Abstract: The hammer mill for treating scrap metal including a rotary hammer means for delivering impact blows to scrap metal is shown. Discharge grates are provided for disposing of the scrap metal through discharge outlets for the hammer mill. The rotor is a disc type with rotating hammers located on pins extending through the discs. A plurality of caps are circumferentially located around each disc and attached thereto for protecting the disc against excessive wear. A dual feed roller feeds the scrap metal to the hammer mill to be shredded.

Abstract: Sanitary articles formed of cellulose flock and non-flock carriers or covers are shredded by rotating entrainers, which are arranged in an enclosed housing. The cellulose flock thus separated is removed from the housing under suction through a sieve which only allow the cellulose flock through. The removal is effected before the covers have been shredded to such an extent that they pass through the sieve. The shredded cover material is then removed separately.

Abstract: Apparatus for producing coarse and fine products from a common source of material and for avoiding the presence of substantial quantities of fines in the coarse product by introducing the common material ahead of the mill and establishing a flow of air or gas counter to the travel of the material through the mill so the fines are swept out of the coarse material and become the second product, or can be used as a source of fuel for producing the heat for drying the material as it is being processed in the mill apparatus.

Abstract: An abrasive roll rice polishing machine which comprises a vertical framework assembly, a vertical rotary shaft extending in the vertical axis of the framework assembly and journalled therein, an abrasive roll mounted on the shaft for rotation therewith, a vertically movable polishing cylinder provided within the framework assembly surrounding the abrasive roll in peripherally spaced relationship to the latter to define a polishing chamber therebetween, a hopper at the top of the framework assembly and a discharge port at the bottom of the polishing chamber.

Abstract: This invention is directed to a new and improved animal bedding comprising newsprint subdivided into a range of particle sizes. The bedding provides the necessary liquid absorbence and resistance to compaction without excessive dust. The invention is directed also to the process and hammermill apparatus for preparing said bedding.

Abstract: A method of forming wood fibres for use in the production of a riding surface comprises feeding wood chips having a length, in the grain direction, of from 18 mm to 35 mm, to a milling machine adjusted to break the wood chips into wood fibres, the lengths of the fibres produced by the milling machine being substantially in accordance with the following percentages, by volume, of the total volume:______________________________________ Wood fibre length Percentage of Total Fibre ______________________________________ 0 mm-5 mm 10%-20% 5 mm-15 mm 40%-55% 15 mm-35 mm 35%-50% ______________________________________It is found that a surface formed from a compacted layer, several inches deep, of fibres produced by the above method has excellent characteristics for horse riding and these characteristics are not unduly affected by variations in weather conditions.

Abstract: A classifier mill having first and second series of beaters (1, 2) on respective sides (3, 4) of the periphery (5) of a rotary pulverizer disc (6) within a chamber (7), an independently rotary classifier (8) coaxial therewith and radially inwards of the second series of beaters (2), an entry (9) for material into the chamber (7) at a position intermediate the pulverizer axis and the first series of beaters (1), and an exit (10) for fines coaxial with the classifier (8) and remote from the pulverizer (6), is further provided within the chamber (7) with an annular wall (18) extending radially outwards from clear of the periphery (19) of the classifier (8) to beyond the periphery (5) of the second series of beaters (2), and with a cylindrical wall (20) extending from the annular wall (18) past the peripheries of both series of beaters (1, 2), the cylindrical wall (20) being provided with a series of circumferentially spaced openings (21) disposed radially outwards with respect to only the first series of beaters

Abstract: A vertical frictionally abrasive roll rice polishing machine in which a vertical rotary shaft extended in the vertically axial direction of a framework assembly, a vertical frictionally abrasive roll is mounted at the upper end of the shaft, a polishing cylinder surrounds the abrasive roll in coaxial and peripherally spaced relationship to the roll to define an annular polishing chamber therebetween, the polishing cylinder rotates and moves depending upon load applied thereto, the abrasive roll rotates but does not move vertically, a material supply passage is formed above the polishing chamber and a polished rice discharge passage is formed below the polishing chamber.

Abstract: One aspect of the invention is a tire debeading machine (10). A tire is supported on a guide apparatus (15) and raised to an operative position by the action of a support arm (21). A cutting blade (33) is moved against the sidewall of the tire, cutting off the bead. After the initial cut is made, the tire is raised slightly further by the combined action of an initially interlocking vertical arm (75), which extends from said support arm (21), and a roller (71) on an L-shaped arm (69). The further cut by blade (33) is closer to the bead. Another aspect of the invention is a granulating machine which includes three feed rollers (93) (95) (97) which feed the debeaded tires into a cylindrical cutting chamber (106). Inside the cutting chamber (106) are a plurality of rotary cutting blades (127) mounted on mounting plates (130), which cooperate with stationary cutting blades to produce granulated rubber particles and fiber particles.

Abstract: A granulator or grinding mill comprising a pair of power driven drums mounted at the bottom of a housing. The first drum is provided on its periphery with a plurality of fingers or pins projecting through slots in an inclined plate hingedly secured to a side of the housing. The fingers or pins break various pieces of articles, such as unfired pottery and ceramic, dumped in the housing on top of the plate, the pieces falling to a lower level being those small enough to pass between consecutive fingers and a crushing plate mounted on the side of the housing. The pieces falling to a lower level are further broken and pulverized by a power driven cylinder provided on its surface with longitudinal bars. The bottom of the housing has an aperture masked by a removable screen of a predetermined mesh, such that only particles capable of passing through the screen and falling in a receptacle are reused, for example for making a slurry for manufacturing ceramic or pottery.

Abstract: A device is disclosed to facilitate the crushing of the metal scrap received from a machine shop as part of a metal and cutting oil recovery system. The device involves the use of a grate ahead of the crusher to separate chunky metal parts or heavies and fines from the enmeshed coils and snarled turnings resulting from machining. The coils and turnings free of the chunk materials are forcibly fed into a crusher designed to automatically eject any chunky material which escapes the separation process.

Abstract: A self-loading feed mixer and transport wagon is provided which is capable of grinding and loading a stack of livestock feed material into the wagon, thoroughly mixing the feed material together, and transporting the feed material to a desired location where it is dispensed from the wagon. The wagon includes a feed grinding and loading mechanism which is vertically adjustable to engage the stack of feed material at different levels. The feed grinding and loading mechanism comprises an open-faced housing which contains a rotatable shaft provided with a plurality of hammer units and a concave screen spaced from the shaft and cooperable with the hammer units to grind the feed material. The grinding and loading mechanism includes a grapple fork pivotally mounted on the housing and adapted to urge the feed material through the open-faced housing into engagement with the pulverizing hammers. The grapple fork is provided with a shield which serves as a protective cover to close the open-faced housing.

Abstract: A process is provided for the removal from paper pulp of impurities, the pulp being contained in a pulping machine. Some of the pulp is periodically transferred into an enclosed chamber annexed to the pulping machine, the chamber having a volume which is small compared to the volume of the pulping machine. The pulp in the chamber is stirred and separated by a rotor, and fibre suspension is returned to the pulping machine, dilution water being introduced into this chamber. The chamber is emptied and impurities thereafter discharged.

Abstract: A reducing mill for handling a wide variety of trash and waste material needing reduction to a state for easy subsequent handling and for separating certain components of the material by a specific gravity characteristic. The reducing mill embodies means for mixing and segregating components of the trash and waste material by the combined jet and negative pressure gradient induced by the action of an air stream, and by the cooperation of a hammer mill housed in a casing formed to effect recycling of material which needs or may require recirculation for further reduction and segregation.

Abstract: A self-loading feed mixer and transport wagon is provided which is capable of grinding and loading a stack of livestock feed material into the wagon, thoroughly mixing the feed material together, and transporting the feed material to a desired location where it is dispensed from the wagon. The wagon includes a feed loading mechanism having a set of pulverizing chains for grinding the feed material and a blower unit for loading the material into a feed compartment. A rotatable conveyor mechanism located in the feed compartment includes a set of feed engaging paddles oriented diagonally and resiliently mounted on the conveyor shaft for advancing the feed material. One or more mixing augers are provided in the feed compartment for agitating and mixing the feed material in its advance toward a discharge area to produce a uniform feed ration. A discharge elevator is provided to dispense the mixed feed material from the wagon.

Abstract: A grinding mill for grinding surplus bread includes an upright cylindrical housing containing a preliminary grinding chamber, a subsequently arranged hammermill and a strainer through which the finished ground stock leaves the grinding mill. The preliminary grinding chamber includes rotor mounted pre-cutting knives and wall mounted breaker strips. Feeding teeth mounted on the rim of the rotor communicate the pre-cut bread from the preliminary grinding chamber through an annular gap to the hammermill for final grinding by rotor mounted mill hammers and wall mounted breaker strips.

Abstract: The invention herein relates to the screen latching apparatus of a hammermill structure in which the improvement consists of a releasing and latching arrangement for the removal and replacement of a screen member by a tension linkage whereby the screen is released for removal from its operating position and the replacement screen is latched into position by the forward and reverse action of an operating handle.

Abstract: A harvesting apparatus adapted to move through a field of vegetation having a liquid component and a fiber component to mow and gather the vegetation and a processing means to grind the vegetation to a pulp as it is received, extract and collect the liquid component thereof, and condition and discharge the fiber therefrom.

Abstract: Apparatus for processing waste material which includes domestic and industrial waste, and in which the recovery of aluminum containers is an important aspect. The apparatus comprises a shredding mill and a housing structure to which the waste material is delivered in such manner that the difficult to shred heavy objects are allowed to separate by gravity action, and the remainder of the waste material is dispersed by an air stream such that the air responsive fractions are collected in a separator chamber and the remainder of the fractions are fed into the shredding mill under the control of gate means which responds to ability of the shredder to receive and process the same without overloading the motor drive.

Abstract: A culinary mixer and disintegrator for receiving material to be blended, comminuted, or liquefied, having a container body defining a lobular cavity for accommodating the material to be blended, comminuted, or liquefied, the cross section of the cavity being of generally Figure-8 configuration with plural distinct lobes, each provided with a comminutor/blender blade rotatably disposed therein.

Abstract: A chopped mixture derived from municipal solid waste, free of ferrous metal is fed into the open upper end of a vertical rotor chamber for contact sequentially by an upper and lower high-speed rotor, with the rotor blades of the rotors further chopping the mixture and imparting centrifugal force to the mixture particles. Selectifier screens concentrically surround the rotor blades at the upper and lower rotor positions and have mesh openings which effect ballistic separation and elimination of glass, grit, sand, dust and fiber elements at these levels dependent upon the screen size openings. The two rotors are separated to form an intermediate treatment zone permitting liquid or solid spray of the mixture particles passing vertically downward from the upper rotor zone to the lower rotor zone.

Abstract: A tub grinder suitable for comminuting forage crops as feed for livestock comprising a rotating circular tub having a floor with an opening therein through which a hammermill communicates for chopping the forage. When the forage is fed too quickly and overloads the hammermill, a governor senses that the rotational speed of the hammermill has been reduced and operatively signals the tub driving mechanism to slow the speed thereof, thus feeding forage at a lesser rate and allowing the hammermill to recover. A similar but opposite process occurs when the hammermill increases in speed to the extent that it is able to handle additional forage. A dampening mechanism is used in conjunction with the governor and functions to allow the tub rotation to slow immediately upon the hammermill being overloaded, but somewhat delays the increase of the tub rotation when the hammermill can receive additional forage.

Abstract: A novel cooperative blade construction for the rotor and bed knives of a size reduction machine such as a granulator and the like wherein each of the blades are of an overall chevron configuration so as to form a generally trapezoidal opening therebetween. As the blades progressively move past each other, the height of the trapezoidal opening is reduced such that articles to be granulated are initially contacted at opposed laterally spaced points on opposite sides thereof such that articles are clamped and progressively cut with a minimum of energy consumption, noise and fines production. The generally centrally located peaks of the rotor blades and the bed knife blades are also arcuately displaced away from a radial plane passing through the opposite side portions. The blades progressively move past each other while maintaining an equal cutting gap therebetween.

Abstract: A grinder apparatus for destroying disposable hypodermic syringes, needles, and the like having a feeder valve for delivering varying sized objects to a grinder which has a plurality of flexibly connected grinding means attached to a rotating shaft and an arcuate screen cooperating with the grinding means to facilitate comminuting of articles supplied by the feeder means.

Abstract: Apparatus for making fiber insulation from paper comprises a preshredder having a semi-cylindrical perforate basket with a passageway behind it. An air inlet extends behind the basket into the passageway and an air outlet is located at the front of the passageway. A flail rotatably mounted coaxial in the basket is driven by a motor for shredding paper deposited from a conveyor into the basket. A blower, connected to the preshredder, passes the paper segments to a surge bin where the air and paper segments are separated. The separated paper segments accumulate in the surge bin and are withdrawn from it at a constant predetermined rate by a conveyor and deposited into a duct which interconnects the surge bin and a finishing mill. The air then enters this duct to continue transporting the paper. A dry chemical dispensing device disperses flame retardant material into the duct. The finishing mill includes a large centrifugal fan rotatably mounted in a cylindrical cavity and driven by a motor.

Abstract: A beater mill comprising a cylindrical housing which accomodates a rotor carrying at least two arcuately spaced groups of beaters, the beaters from group to group being axially offset, the cylindrical jacket of the housing being formed as a peripheral sectional screen, an axial inlet for material to be milled being provided adjacent the rotor axis, the rotor arms being formed as fan blades and the said inlet including a distributor means for the air and material taken in through the inlet.

Abstract: A cutting mill is disclosed which comprises a housing formed of upper and lower pivotally related housing parts in which a rotor carrying cutting tools is disposed along a horizontal axis. Stator cutting tools are mounted within the housing for coaction with the rotor cutting tools and a sieve is removably mounted in the lower housing part. The rotor is mounted in bearings which are selectively carried by the upper housing part or the lower housing part when such parts are pivoted relative to each other to permit (1) replacement of the sieve when the rotor with its bearings are carried by the upper housing part or (2) accessibility for adjustment of the stator cutting tools in the upper housing part when the rotor and bearings are retained in the lower housing part.

Abstract: An alfalfa separator is provided for separating the coarser stem and fiber portion of the alfalfa plant from the finer leaf portion. The separator includes a housing having a chamber therein. The bottom part of the chamber is defined by a screen which is sized to pass the finer portions of the alfalfa. A drum having a plurality of hammers located about the periphery of the drum is mounted for rotation within the chamber. The drum serves, by means of the hammers and the centrifugal forces generated during rotation, to grind up the alfalfa so that the finer portions pass through the screen. A passageway, located above the screen and including an inlet aperture in communication with the chamber, is disposed so that the coarser portions can pass out from the chamber under the influence of the forces referred to above. A gate controls opening and closing of the passage, and suction is used in drawing off and removing the coarser portions.

Abstract: This invention relates to size reduction apparatus and particularly to a novel feed device thereof and method of feeding sheet material thereto. A first baffle is adapted to extend into the cutting chamber simultaneously towards the cutting rotor and a downstroke wall portion from which a bed knife is adapted to extend into cutting contact with knife means mounted on the rotor. Such construction, in effect, enables the simultaneous formation of a variable width sheet feed opening to the granulator as well as means for restraining a portion of already granulated material on the upstroke side of the rotor from contacting the sheet material as it is fed between the rotor and bed knife. A secondary baffle may in turn be disposed in contact with the first baffle so as to close a secondary or housing opening disposed between the first baffle and a pair of upwardly spaced feed rolls.

Abstract: The shredder apparatus has all high wear regions of the stationary parts protected by readily replaceable liners. A funnel fed arrangement into the shredder chamber prevents jams of material being fed to machine and build up of foil and dirt, etc., which can also cause jams. Wind vane bolts are recessed into the rotor and wind vanes are located on the lower wear side thereof and cooperating bolts are located on the low wear or protected side of the vane. A replaceable dummy wear liner is provided under the shredder screen to protect the frame and is readily replaceable and removable by lifting from its craddle. The shred heads are comprised of two parts, a yoke and a replaceable head portion to extend life of each head and provide ease of replacement.

Abstract: Upper and lower rotors are offset in position, such as at an angle of 60.degree., between their centerlines, with the upper rotor having larger hammers and rotated at a lower speed than the lower rotor having smaller but a larger number of hammers. The feed is to the top of the upper rotor, and heavy interception bars extend perpendicularly to the centerline between the rotors and are disposed between the sets of hammers of the lower rotor, to prevent the entry of large objects into the lower rotor, to form an anvil against which objects on the bars are impacted by both the upper and lower hammers, with the lower hammers also "nibbling away" on the objects. A U-shaped corner formed of heavy armor plate is positioned next to the interception bars and extends between the circles of rotation of the hammer ends.

Abstract: A comminution device having an improved means for supporting and gaining access to the sizing screen as well as an improved arrangement for material discharge from such comminution device.

Abstract: A shredder for reducing scrap materials such as scrapped automobiles to pieces of a smaller size includes a shredder housing having an inlet and an outlet, rotary hammer means positioned in said housing, cutter means, and means for rotating said hammer means to co-act with said cutter means to reduce the material to smaller pieces. The outlet is closed by a door which contains a discharge grate through which shredded pieces must pass to leave the housing. The door is normally locked, but can be opened from the outside to permit unshreddables to be readily removed from the shredder and to replace the grate when necessary. In one embodiment the outlet is located in the end wall of said housing preferably about 180.degree. from the inlet and the door contains a grate which is comprised of a plurality of grate segments.