Abstract: A sieve has a fine wire mesh retained by a ring and two annular casings detachably linked to each other by clamping elements for clamping the wire mesh. The edge of the flat wire mesh is firmly secured to a wire ring. The first annular casing ends in a rounded end flange and the second annular casing surrounds the rounded end flange with a radial annular step for clamping of the wire ring. The wire mesh may be gently mounted into, and out of, the sieve so that the wire mesh is not damaged.

Abstract: A free standing curved garden sieve of parabolic shape to separate stones and coarse matter from garden soil as the garden soil travels from upper substantially vertical portions to lower substantially horizontal portions.

Abstract: In a vibratory screening apparatus, a withdrawable lower fine mesh screen assembly (17) has a screen unit (19) releasably mounted on a grid/frame structure (20). The screen unit (19) has a sheet (21) of mesh material bonded to a grate or lattice (22) of a yieldable material such as a hard rubber, and this lattice (22) and the edges of the mesh (21) are also fixed to relatively rigid side members (23) which are mutually free each from the others. In the structure (20), a rigid grate of support bars (26) supports the lattice (22) with a sliding contact interface, and a frame (28) incorporates pneumatically actuated tensioners (30) and clamps (34A, 34B) respectively for tensioning/locking the screen unit (19) and coupling the screen assembly to the vibratory structure. The tension in the screen unit (19) is adjustable whilst on the structure (20) by virtue of the yieldability of the lattice (22) and its sliding contact interface with the support bars (26).

Abstract: A screen for a shale shaker has screening material between opposed frame sides and one or more lower strips beneath the screen. In one aspect a plurality of lower strips are bonded to the screen and extend across the screen from one frame side to the other. In one aspect the screen is undulating screening material and lower portions of the screening material are bonded to the strips.

Abstract: A sifter frame is composed of a pair of frame elements including an outer frame and an inner frame, and the outer frame is formed from a frame member having the same height and includes a pair of fine powder dropping ports, a rough powder dropping port and a rectangular fine powder receiving plate disposed in a region surrounded by these openings and one of the outer block frame members and the inner frame is fitted with the space above the receiving plate.

Abstract: A screening system having a resiliently mounted housing with a screen extending thereacross. The housing is vibrated by a low frequency vibratory drive using eccentric weights. About the peripheral frame of the screen, a high frequency drive or drives is employed to vibrate the screen in the range of 20,000 Hz. The high frequency vibration is generated at the peripheral frame about the screen. The screen may be responsive to the high frequency vibrations in a plate-like manner or as a membrane. With the high frequency drives mounted within the housing, a structure made of a sheet extends from a mounting flange inwardly to a mounting ring supporting the screen and the high frequency drives and inwardly to a collecting system including a trough and a central dome. The center of the dome may be fixed to the screen and include a high frequency drive.

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 substantially planar screen for a solid particle separator is formed from one or more layers of mesh. The one or more layers of mesh are formed into a series of ridges separated by channels within the plane of the screen. The wire mesh is bonded to a rigid or semi-rigid panel having a plurality of relatively large openings as compared to those of the mesh to create a plurality of repairable screen cells. The support panel is formed with or bent into a series of alternating ridges and channels to create the ridges and channels in the wire mesh when it is bonded to the panel. The cross-sectional shape of the ridges are generally triangular to maximize exposure of surface area of the screen to a flow of material to be separated. Flat surfaces on the ridges and in the channels facilitate repair of screen cells with solid plugs.

Abstract: An overflow sieve in which the sieve bottom is in the form of a slotted hole sheet whose slots have a width less than 1.0 mm and a length of 0.5 to 4 mm or a fine hole sheet with noncircular holes of a greatest width or diameter of less than 2 mm.

Abstract: The invention provides for a screen support frame component, and for a screen support frame including such a component, in which the component comprises an elongate bar having at least one tubular element affixed thereto. The tubular element defines a socket in which securing means for securing the panel is receivable.

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: A screening deck is shown and described including an intermediate frame structure mountable to the screening deck in a manner similar to that of an original screen component, but providing mounting formations for attachment of a plurality of screen modules thereon. The screening deck need not be modified in order to receive the intermediate frame. The intermediate frame may be applied to either a crowned screening deck or a flat screening deck. In the crowned configuration, the intermediate frame takes a form similar to the original screen, but includes mounting rails for receiving the screen modules. In the flat screening deck configuration, individual intermediate frame components mount along the longitudinal support beams and provide formations for mounting of screen components thereon. In each illustrated embodiment, individual screen components are mounted and dismounted without separate fastening elements and enjoy support along at least two edges thereof.

Abstract: Disclosed is a ball cleaner for a screening machine in which the ball cages are presented by a molded plastic insert having integral intersecting longitudinal walls and cross walls. The weight of material being screened on the screen which overlies the insert is not carried by the insert but rather by a separate support beneath it. The support comprises a peripheral frame and joists within the frame which directly underlie at least the longitudinal walls of the insert. The insert completely isolates the frame from the erosive action of the cleaning balls and can be replaced separately from the frame.

Abstract: A vertical set of sieves receives the particulate material from a vibrating trough conveyor above the set and is vibrated by an agitator on the machine frame. The sieves are spread apart and then tilted to dump the collected particles into respective funnels. The set can then be swung back and contracted for the the next stage. The funnels are connected to collectors which are automatically weighted.

Abstract: A riprap separation apparatus and method which riprap apparatus comprises a frame having an open space within the frame, an upper grizzly section composed of a tiltable upper grizzly section having a plurality of fixed, spaced apart bar elements so that riprap material discharged onto the grizzly section is separated into a large size material and a smaller size material which passes through the bar elements and a downwardly angled discharge chute to receive the larger size material and to deposit the large size material to one side of the apparatus. The apparatus includes a support section disposed to be within an earthen sloped access ramp to provide support for the apparatus and with the ramp to provide for the movement of vehicles to discharge riprap material into the grizzly section.

Abstract: An interlocking clamping system for the components of a sieve deck having a foraminated surface defined by rows of stainless steel profile wire held in laterally spaced relation to each other on transverse support rods for processing granular material. The interlocking clamping system eliminates the need for providing a heavy reinforced frame around each modular screen section by including as a part of the clamping system pairs of elongated retainer bars between longitudinal rows of modular screen sections. Each retainer bar receives and retains corresponding ends of the transverse support rods in a plurality of modular screen sections. Locking pins extend through sockets in the retainer bars to releasably connect the modular screen sections to an underlying base. The removal and replacement of individual screen sections is possible when desired without disturbing the other screen sections. A movable dam is provided with an effective seal to prevent leakage between adjacent screen sections.

Abstract: A rigid, elongated member and cover of resilient, abrasive resistant material which provides protection for the rigid elongated member are adapted for positioning under a sizing screen. The cover protects the elongated member from sand falling through the sizing screen, thus reducing the amount of damage that the falling sand may inflict on the elongated member due to abrasion, erosion, etc.

Abstract: A tray classifier in which the trays are locked together easily, and stay locked together while being shaken, but are movable with respect to each other if the trays came in contact with an object. The trays have upper and lower locking surfaces which nest with the locking surfaces of the stack locking member of an adjacent upper or lower tray.

Abstract: A modular screening system which includes a plurality of screening modules supported in an interlocking manner of clamping bars secured to and positioned across a screening machine in parallel spaced relationship. The modules have a peripheral portion defined by side and end walls with a plurality of openings extending through the modules inwardly of the peripheral portion. The side and end walls of the modules are provided with interengaging means which interlock with longitudinal and transverse channels in the clamping bars to secure the modules in position in the machine, the modules are provided with interengaging means whereby the modules interlock together.

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 screening basket has one or more screen decks and has upright side walls integrated with cross beams. A side beam, at approximately the center of gravity of the basket, is integrated with each of the side walls as well as with the cross beams to provide a unitary, rugged basket capable of vibratory movement on a support frame. A pair of cross shafts extend transversely of the screening basket and project beyond the side walls. These shafts are journaled in the side beams and have one projecting end geared together for opposite rotation. These projecting ends carry semi-circular eccentric weights of different mass to provide an oval vibratory stroke of the screening basket upon rotation of the shafts. Adjusting mechanism is provided to adjust the relative position of the weights on the shafts to vary the angle of stroke. These weights are arranged to receive auxiliary weights to vary the amplitude of vibratory stroke as well as the shape of the stroke.

Abstract: Rotary grain cleaning machines are well known. The present invention provides a grain cleaning machine comprising an aspirator unit and a screen unit. The screen unit has an inner frame assembly suspended from an outer frame assembly, inclined screen decks secured to the inner frame assembly and means for causing the inner frame assembly to rotate in a substantially circular path within the outer frame assembly.

Abstract: An apparatus for classifying granular material comprises an outer frame and an inner frame, a screen deck mounted in the inner frame; apparatus suspending the inner frame and deck from the outer frame; resilient apparatus mounting the deck on the inner frame; apparatus for vibrating the at least one screen at the high frequency and in a generally vertical plane and apparatus for applying the lower frequency motion to the inner frame and deck in a generally horizontal plane.

Abstract: A plurality of truss-like supports are secured, as by welding, and in spaced relationship, to the underside of a screen cloth. The supported screen cloth is then removably secured in position in a vibrating frame to form therewith a vibrating screen. Each truss-like support includes a support rod formed of wire rod of predetermined diameter disposed with a major portion thereof spaced from and substantially parallel to the plane of the screen cloth, and with end portions thereof merging into the plane of the end pieces of selected wire rods forming the screen cloth and being welded thereto. A spacer wire, formed from wire rod of a diameter less than that of the support rod and to an approximate sinusoidal configuration, is disposed so that the upper tips, formed by the sine configuration, are welded to the bottom surface of the screen cloth and so that the lower such tips are welded to the upper surface of the support rod.

Abstract: A screen apparatus has a frame having a pair of spaced-apart longitudinal beams whose ends are bridged by a pair of spaced-apart transverse beams. A central longitudinal member or wall equidistant between the longitudinal beams has ends secured to the transverse beams. Transverse struts extend between the longitudinal beams and through the central wall and support a screen. The frame is mounted for limited displacement relative to a fixed support and a drive motor is fixed to the central member and carries an eccentric for limitedly displacing the frame and the screen in a vibratory or oscillatory manner.