Abstract: A rectangular screen box is supported through a plurality of shock absorbing members from an elongate mounting frame. The screen box has an upstanding wall surround along three sides thereof and within which two vertically-spaced stations are provided. Each station is to carry an elongate screening surface having engaging elements at each longitudinal end thereof to be secured to a respective holding bar member arranged transversely between opposite sides of the surround and near opposite ends of each station. The outer ends of one bar member for each station extend out through an opening in opposite sides of the surround to be engagable by an element to move the bar member for each station relatively apart to longitudinally tension a screening surfaced secured thereto.

Abstract: A vibrating screen apparatus having a pair of side members, a screen surface supported between the side members, a pair of frame members supported between the side members and beneath the screen, a first hammer to vibrate the screen, a second hammer that alternately vibrates the screen with the first hammer and a motor to impart motion to the hammers and frame members. The screen apparatus is provided with a method to selectively tension the screen surface. The apparatus is equipped to permit varying the frequency and amplitude of the hammers and screen material. The apparatus is equipped with only a single motor on each screen section to provide economy in use.

Abstract: A vibrating screen apparatus for effecting screening of materials includes a frame with first and second vibrating screen deck units mounted one above the other in it. To provide maximum flexibility of operation, the vibrating deck units are pivoted at the material feed end on the frame. Hydraulic cylinders are attached between the free ends of the first and second vibrating screen deck units and the frame for independently varying the angle or slope of each of the deck units, relative to the frame, for adjusting the dwell time of material passing over the deck units. A flexible corrugated rubber curtain extends between the upper deck unit and the lower deck unit to ensure that material which passes through the upper deck unit is guided onto the surface of the lower deck unit. In addition, each of the vibrating screen deck units has an independent vibrator mechanism on it; so that the vibration rate and magnitude may be independently adjusted for each of the deck units in the system.

Abstract: A vibrating screen apparatus includes a frame and a screen having a first end coupled to an anchor beam which is rigidly coupled to the frame. The apparatus also includes a tension control assembly coupled to a second end of the screen for tensioning the screen to substantially a predetermined tension. The tension control assembly is rotatably coupled to the frame spaced apart from the anchor beam. The tension control assembly changes the tension of the screen upon rotation of the tension control assembly relative to the frame about an axis of rotation. The apparatus further includes an adjusting mechanism for moving the tension plate in a direction normal to the axis of rotation of the tension plate to compensate for nonuniform tension of the screen.

Abstract: A dewatering system for use in the treatment of waste water is disclosed which includes a tank, an inclined filter bed having a plurality of filter elements and components for inducing a flow of air through the filter bed to accelerate drying of the removed solids. Also disclosed are components for adjusting the angle of inclination of the filter bed and mechanical components for removing solids from the filter elements. In one embodiment, the filter bed is disposed within an upper unit mounted for rotation on the tank floor to facilitate cleaning of the filters. Adjusting the angle of inclination of the filter bed provides access from the frame, below, for cleaning the underside of the filter.

Abstract: A dewatering system for use in the treatment of waste water which includes a tank, an inclined filter bed having a plurality of filter elements and means for inducing a flow of air through the filter bed to accelerate drying of the removed solids. Also disclosed are means for adjusting the angle of inclination of the filter bed and mechanical means for removing solids from the filter elements.

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: An improved classifying apparatus and assembly for the tensioning of vibratory screens includes a rigid frame, a pair of classifying screens in the frame and means for tensioning the screens. The improvement in the means for tensioning the screens includes a stationary anchor at one end of the screens and elongate rotatable elements adjacent the other ends of the screens. Levers are mounted to the ends of the rotatable elements outside of the frame and a tensioning cable extends between the levers. A tensioning member is positioned in the cable which, when adjusted, rotates the rotatable elements to simultaneously and uniformly adjust the tension on the screens.

Abstract: The invention relates to a screen surfacing with exchangeable screen elements fastened juxtaposed, which are fastened on a load-bearing substructure. A plastic profile (2) which engages under the edges of at least two mutually adjacent screen elements (14, 15) is fastened on the load-bearing substructure (1) in the region in which two adjacent screen elements (14, 15) adjoin mutually. A second, upper profile (8) is fastened detachably over this plastic profile (2), and a screen element (14, 15) is retained and clamped between the first and second profile on each of two sides.

Abstract: One end portion of a wire net is fixedly secured to a fixed holder on a base frame of a sieving machine provided with a vibration device, the other end portion thereof is fixedly secured to a movable holder that is provided on the base frame so as to be freely movable, this movable holder is biased in the direction of separating the movable holder from the fixed holder by means of a spring provided on the base frame, and also, on the base frame is provided a hydraulic device which moves the movable holder in the direction of approaching to the fixed holder against the resilient force of the spring. During operation of this sieving machine, in orer to clear blocking of the meshes of the wire net, the hydraulic device is actuated only when the particles of raw material which caused the blocking are shaken off by relaxing the wire net and broadening the distance between adjacent wires in the wire net.

Abstract: A classification screen or sieve is provided having a plurality of elongated pieces, each piece having a substantially straight posterior edge, and an anterior edge downstream from said posterior edge having a plurality of alternating projections and notches. Each elongated piece being staggered or off-set with respect to the succeeding elongated piece without touching it and each of said elongated pieces being parallel to each other and vertically displaced from each other.

Abstract: An improved animal sanitary litter box comprising a pair of identical matingly interfitting stackable trays, each of the trays including a slidably movable bottom panel which is movable between a first, closed position for retaining a quantity of litter, and a second, open position. Litter is sifted downwardly from an upper tray to a lower tray, while solid animal excrement is retained on the bottom floor of the upper tray. The excrement can be discarded, the tray cleaned, and then returned to the lower position of the pair of trays. The tray into which the litter was sifted can then be placed atop the now-clean first tray and the litter reused. The size of the openings defined by the movable bottom panel and the floor of the tray is selectively variable for better sifting.

Abstract: A screening device having a screen deck composed of two screen frames (11, 27) provided with oblong, parallel screening elements (20, 28), the elements (20) of the first frame being arranged between the elements (28) of the second frame. The second frame (27) rests on the first frame (11). The frames are provided with guide and contact elements (22-26, 32) for guiding and retaining the second frame in a predetermined position on the first frame. The second frame (27) can, in order to free material particles which have jammed between the screening elements (20, 28), be raised freely relative to the first screen frame to a predetermined maximum height, the frames and their screening elements remaining parallel to one another. The frames can be resiliently supported for performing oscillating movements relative to a support frame (5) and relative to one another.

Abstract: A screening apparatus comprising a rectangular screening frame and a multiplicity of parallel wires which are tensioned across the screening frame has a plurality of support bars with guide slots in order to support additionally each wire. The support bars are axially rotatably and interchangeably secured to the screening frame thus allowing to use the same screening frame for different string assemblies with different distances between the wires.If guide slots for different wire spacings are provided at different sides of a support bar, the same frame and the same support bars can be used for different string assemblies.The arrangement according to the invention allows an easy and rapid change of string assemblies on the same screening frame.

Abstract: A garden sieve for mounting on a wheelbarrow has a frame and a stand adapted for detachable connection by means of selectively engageable projections and recesses, with the frame in any one of a series of positions whereby the extension and/or angular position of the stand relative to the frame is adjustable. In the preferred embodiment the stand has two arms, the free ends of which engage opposite sides of the frame near one end thereof and the other end of the frame carries clips intended in use, to fit over an edge of the wheelbarrow.

Abstract: A sizing screen for sizing particulate materials, for example, is provided which uses a plurality of wire loops arranged to define a plurality of parallel wire strands extending between a first end and a second end of a screen frame. The frame has anchor means mounted at its first end and tension means at its second end. In the simplest form of the invention, pairs of wire strands are adjusted simultaneously by the tension means. In more advanced forms of the invention, means are provided for adjusting pluralities of the wire loops, each wire loop adjustment corresponding to two wire strand adjustments. The frame is constructed so that the wire strands have a double crown. One crown extends along the width dimension of the frame, and a second crown extends along the length dimension of the frame. The double crown arrangement promotes more even spreading of material as that material travels along the wire screen and is important in maintaining wire strand position.