Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate or frame, and a bonded 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 or frame. 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 or frame, and bonding the undulating bonded subassembly to the apertured plate or frame.

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 screening screen assembly for a vibratory screening machine including an apertured plate, and a bonded 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.

Abstract: A screening screen assembly for a vibratory screening machine includes a substantially planar apertured plate and an undulating subassembly of a support screen and a fine screening screen having ridges and troughs. A fused plastic grid bonds the fine screening screen to the support screen at spaced locations while leaving unobstructed portions of the screens therebetween. The undersides on the troughs are bonded to the apertured plate. The fused plastic grid includes first portions extending substantially perpendicularly to the length dimension of the ridges and throughout the major portion of the sides of the ridges and also includes second portions which extend transversely of the first portions and extend through spaced portions of the troughs while leaving unobstructed portions of the troughs therebetween.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a bonded 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 screening screen assembly for a vibratory screening machine including an apertured plate, and a bonded 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 quick release draw bolt device including a bolt member, an end on the bolt member for exerting a pulling force on an external member, first and second body members mounted on the bolt member, a cam arrangement between the first and second body members for causing them to occupy relatively close and relatively remote positions relative to each other, and a spring arrangement mounted relative to the first and second body members for causing the bolt member to exert a pulling force when the first and second body members are in a relatively remote position and for releasing the pulling force when the first and second body members are in a relatively close position. An alignment structure for the screen of a vibratory screening machine including a notch on the channel end of a screen and a cooperating tab on the drawbar which engages the channel. A balloon seal for attachment to the edge of a vibratory screen for sealing the space between the edge and the bed of the machine.

Abstract: A screen assembly for a vibratory screening machine including a frame, and a screen cloth on the frame having wires with a diameter D of between about 1.6.times.10.sup.3 micrometers and 17.8 micrometers with a peak to valley roughness R in micrometers which is between about R=0.333D and R=0.05D. A screen cloth for mounting on the frame having a range of dimensions as set forth above. A method of making a screen for a vibratory screening machine including the steps of providing a screen cloth having a wire of a diameter D of between about 1.6.times.10.sup.3 micrometers and 17.8 micrometers and roughing the surface of the wires to a peak to valley roughness which is between about R=0.333D and R=0.05D.

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 separator plate construction for flake-like members including a plate body having a longitudinal axis, a plurality of elongated slot openings in the plate body extending longitudinally of the longitudinal axis, and orienters on the plate body for orienting elongated flake-like members which are thinner but wider than the openings into a direction extending longitudinally of the openings and rotating them so that they can pass through the openings.

Abstract: A vibratory screening machine having a main frame, a screen frame pivoted at substantially its midpoint on the main frame, a weir which receives a liquid-solid mixture to be screened, a discharge spout on the weir, a linkage interconnecting one end of the screen frame with the discharge spout, and a hand wheel effectively connected to the discharge spout to raise and lower it and thereby simultaneously adjust the inclination of the screen frame while maintaining the drop of the liquid-solid mixture being discharged onto the screen frame substantially constant in all inclined positions of the screen frame.

Abstract: A molded polyurethane vibratory screen including a body having opposite side edge portions, upper and lower edge portions, an upper surface and a lower surface, a plurality of major and minor substantially parallel ribs extending between the upper and lower edge portions and substantially parallel to the side edge portions, dividing strips extending between the major and minor ribs to define screen openings therebetween, aramid fibers extending between the side edge portions and through the dividing strips to provide tensile strength to the dividing strips, and upper triangular cross section portions formed integrally with the major and minor ribs and extending above the upper surface of the screen to direct foreign matter laterally toward the screen openings. The dividing strips are preferably in the cross-sectional form of an inverted trapezoid, or in a form having an upper portion in the shape of an inverted trapezoid and the lower portion in the shape of a rectangle.

Abstract: A molded polyurethane vibratory screen including a body having opposite side edge portions, upper and lower edge portions, an upper surface and a lower surface, a plurality of major and minor substantially parallel ribs extending between the upper and lower edge portions and substantially parallel to the side edge portions, dividing strips extending between the major and minor ribs to define screen openings therebetween, aramid fibers extending between the side edge portions and through the dividing strips to provide tensile strength to the dividing strips, and upper triangular cross section portions formed integrally with the major and minor ribs and extending above the upper surface of the screen to direct foreign matter laterally toward the screen openings.

Abstract: A non-clogging and wear-reducing screen assembly for a vibrating screening machine including a substantially rigid plate having upper and lower sides and having first and second pairs of opposite edges, attachment members formed integrally with a plate on a first pair of opposite edges for attachment to a vibrating screening machine, a plurality of spaced openings throughout the substantially rigid plate and extending in both directions between the first and second pairs of the opposite edges, borders on the plate surrounding the openings, a supporting screen on the upper side of the plate, first and second superimposed contiguous abutting screens overlying the supporting screen, and adhesive firmly securing the supporting screen and the first and second screens to the borders of the openings.

Abstract: A flow divider of the type here involved consists of a cylindrical tank having a tangential inlet near the top and a plurality of tangential outlets near the bottom. The tangential inlet produces a swirling or cyclonic action but solid material entrained or suspended in the liquid does not remain uniformly distributed in the liquid and thus the several outlets do not contain uniform quantities of solid material. The present disclosure provides an annular internal flange between the inlet and outlet passages which produces turbulence in the liquid adjacent to the wall of the tank which results in uniform solid material concentrations at the several outlets.

Abstract: Vibrating screen apparatus wherein high screening output is achieved by providing a series of inclined screens in generally end to end relation whereby undersize material passing through the screens is received in a common hopper disposed beneath the screens. The oversize material falls from the lower end of each screen and guide means thereat directs the oversize material from the several screens into a common conduit extending longitudinally beneath the screens to conduct the oversize material from the apparatus. A splitter above the apparatus divides the input material into equal parts corresponding to the number of screens and discharges such parts onto the upper ends of the several screens.

Abstract: A vibratory screening apparatus has a pair of screen cloths in close face to face abutment with the wires of the lower screen cloth generally intersecting the openings of the upper screen cloth to prevent "blinding" of the upper screen cloth by reason of the tendency of the wires of the lower screen cloth to prevent engagement of particles in the upper screen cloth of a size which would tend to clog the openings of the upper screen cloth. The mesh size of the lower screen cloth may be equal to the mesh size of the upper screen cloth or slightly larger than the upper screen cloth openings up to about 50 per cent larger. The superposed screen cloths may rest upon a much coarser mesh screen which serves merely as a structural support for the screen cloths and does not perform a screening function.