Abstract: A method of attenuating the sound emanating from a bank of a plurality of vibrating screens of a plurality of vibrating screening machines including the steps of providing a master pulse of known phase and frequency, comparing the phase and frequency of a plurality of vibrating screens with the known phase and frequency of said master pulse, and adjusting the phase and frequency of said bank of plurality of vibrating screens so that the waveforms produced thereby tend to cancel each other. An apparatus for implementing the method is also disclosed.

Abstract: A method and apparatus for centrifuging.

Abstract: A method and apparatus for centrifuging.

Abstract: A screen assembly which includes a frame, a plurality of openings in the frame, a screen overlying the openings, a plurality of spaced tapered ribs on the opposite side of the frame from the screen, a first end on the frame with a lip, and a second end on the frame with a clip thereon. Another embodiment has a first end with a ledge and a second end with an overhanging portion, and a seal on the ledge.

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 vibratory screening machine having opposite sides with a plurality of stationary aligned tensioning members mounted on one side and a plurality of nut actuated movable tensioning members mounted on the opposite side and a vibratory screening screen mounted on the stationary and movable tensioning members. The tensioning members have upstanding fingers which are received in apertures in the plates of the vibratory screen, and the edge portions of the vibratory screen include screening material which extends all of the way to the extreme edges of the supporting plate and the fingers are below the screening material. Also, the tensioning structure is mounted on the side walls of the vibratory screening machine below the vibratory screen.

Abstract: A vibratory screening machine having opposite sides with a plurality of stationary aligned tensioning members mounted on one side and a plurality of nut actuated movable tensioning members mounted on the opposite side and a vibratory screening screen mounted on the stationary and movable tensioning members. The tensioning members have upstanding fingers which are received in apertures in the plates of the vibratory screen, and the edge portions of the vibratory screen include screening material which extends all of the way to the extreme edges of the supporting plate and the fingers are below the screening material. Also, the tensioning structure is mounted on the side walls of the vibratory screening machine below the vibratory screen.

Abstract: A vibratory motor for a vibratory screening machine including a housing having a main shaft mounting outer shafts at its ends with a slip connection therebetween, bearings mounted on the outer shafts, first lubricant chambers on opposite sides of each of the bearings with a conduit therebetween, eccentric weights on the opposite sides of each bearing in each of the first lubricant chambers, second lubricant chambers outwardly of the first lubricant chambers, ducts between each outermost first lubricant chamber and an adjacent second lubricant chamber, second conduits between the second lubricant chambers, and conduits including the hollow portion of the main shaft and bores in the main shaft and outer shafts for conducting lubricant from the second lubricant chambers to the bearings.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

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 screening screen assembly for a vibratory screening machine including an apertured plate, and a subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

Abstract: A separator includes a continuous inclined screening belt that passes over an upper roller and a lower roller to screen debris from municipal wastewater. The debris is then conveyed to a debris discharge outlet. A puddle of debris-laden wastewater forms a hydrostatic pressure head on the upper surface of the screening belt to assist in forcing the wastewater through the screening belt. Wastewater that passes through apertures in the screening belt is deflected by a deflector plate that shields the return path of the screening belt. The screened wastewater is then directed to the wastewater outlet. In a preferred embodiment, a belt-cleaning brush is disposed along the return path and brushes clinging debris from the screening belt toward the debris discharge outlet. Additionally, the screening belt rides on and is supported by a perforated backing plate as it travels from the lower roller to the upper roller.

Abstract: A screen assembly for a vibratory screening machine including a plurality of superimposed screens, channels on the edges of the screen assembly, and a plurality of hollow plastic channeling strips fused into the plurality of superimposed screens. The hollow channeling strips may have metal rods therein, and the plurality of superimposed screens may be bonded to an apertured plate. A method of fabricating a screen assembly for a vibratory screening machine including the steps of laying a plurality of plastic tubes into grooves of a fixture, superimposing the plurality of screens over the plastic tubes, and applying a heated platen to the screens to thereby cause the plastic tubes to fuse into the screens. The hollow plastic tubes may have metal rods therein, and the plurality of screens may be bonded to an apertured plate before the hollow plastic tubes are bonded to the screens.

Abstract: A screening screen having openings in the warp direction which are longer than these openings in the woof direction including warp wires and woof wires of the same maximum size extending at substantially maximum warp and woof crimp angles relative to each other which will not permit the warp wires and the woof wires to slide relative to each other. A method of fabricating a screening screen of the above type including the steps of determining the size of the openings in the woof direction and determining the maximum wire size of the warp and woof wires which will produce a maximum woof crimp angle which will not permit the woof wires to slide relative to the warp wires in the woof direction, and determining the length of the openings in the warp direction which will produce a substantially maximum warp crimp angle which will not permit the warp wires to slide relative to the woof wires in the warp direction.

Abstract: A screen assembly for a vibratory screening machine including a plurality of superimposed screens, channels on the edges of the screen assembly, and a plurality of hollow plastic channeling strips fused into the plurality of superimposed screens. The hollow channeling strips may have metal rods therein, and the plurality of superimposed screens may be bonded to an apertured plate. A method of fabricating a screen assembly for a vibratory screening machine including the steps of laying a plurality of plastic tubes into grooves of a fixture, superimposing the plurality of screens over the plastic tubes, and applying a heated platen to the screens to thereby cause the plastic tubes to fuse into the screens. The hollow plastic tubes may have metal rods therein, and the plurality of screens may be bonded to an apertured plate before the hollow plastic tubes are bonded to the screens.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate having side edge portions with first apertured bands extending between the side edge portions and second unapertured bands alternating with the first bands, the second bands having a wider width than the borders between the apertures in the first band, and an undulating screening screen having ridges and troughs between the ridges extending crosswise to the first and second plate bands and being secured thereto.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

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 screen assembly for a vibratory screening machine including a plate having openings therein, a plurality of screens firmly bonded to the plate, channels on the edges of the plate, and a plurality of hollow plastic channeling strips fused into the plurality of screens. A method of fabricating a screen assembly for a vibratory screening machine including the steps of firmly bonding a plurality of screens to a plate having openings therein, laying a plurality of plastic tubes into grooves of a fixture, superimposing the plurality of screens bonded to the plate over the plastic tubes, and applying a heated platen to the plate and the screens bonded thereto to thereby cause the plastic tubes to fuse into the screens.