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: An aggregate separator has a fan-shaped separating surface made up of an array of diverging end-stretched wires which are permitted to oscillate individually in response to vibratory stimulus. The surface includes a plurality of identical fan-shaped panels, each panel including a plurality of wires and a pair of end sheaths which retain the ends of the wires in fixed relation to each other so that the wires of each panel diverge. Each panel is stretched on the frame of the separator until the length and tension of the wires are substantially the same. Intermediate transverse bridges may be used to position the wires between the upstream and downstream ends of the separator and ensure that the effective spacing between adjacent oscillating wires does not exceed the exit interval.

Abstract: Apparatus for making plastic screen panels, and especially abrasion-resistant mining screens, includes a large rotary screen drum member on which an extruded, profiled cross-section screen surface-forming wire is helically wound at a pitch which will produce the desired screen slot width. Immediately adjacent the drum member is a rod-positioning mechanism from which a plurality of screen panel support rods are sequentially fed from a stack and welded to the wires on the drum surface in a direction parallel to the drum axis and transverse to the surface wires. The welding is done with a double-edged heater bar which is temporarily placed in contact with the rod and drum before the rod is forced against the drum. The screen drum is indexed after each support rod is attached to it by an angular amount sufficient to provide the desired spacing on the finished panel.

Abstract: A screen filter comprising a plurality of rollers arranged in parallel, spaced relationship with a plurality of carriers positioned between the rollers with the axes of the carriers parallel to the axes of the rollers. An endless wire is wound spirally over the rollers and engages the surfaces of the carriers so as to form a screen. A driving means engages at least one of the rollers for driving the endless wire. The raw material to be screened is deposited onto the screen.

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: Screen member for use in fixed or rotating screen support devices and in either a vibrating or non-vibrating mode for grading or dewatering comprises a first plurality of elongated, parallel surface wire members which are formed by extruding a resilient, abrasion resistant layer of elastomeric material completely around a core portion which is more rigid than the elastomeric layer. A second plurality of elongated, parallel support rod members arranged transverse to the first plurality are also formed by extruding a layer of elastomeric material completely around a more rigid core portion. The first and second plurality of wire members are bonded to each other at every intersection by a partial melting together of the contacting elastomeric layers under pressure.

Abstract: An apparatus for removing stone and gravel from excavated soil by vibration. The apparatus is particularly useful for operation at the foot of a volcano, mountainous district or the like. Characteristic features of the apparatus are that it is self-propelled by means of endless tracks and the excavated soil is separated into stone, gravel and soil with the aid of a sieving means and the separated stone and gravel are discharged from the apparatus by way of a conveyor, while the separated fine soil is conveyed by way of another conveyor and then is scattered rearward by means of a scattering device to be piled up on the working ground.

Abstract: A screen for separating particles is disclosed which consists of a plurality of rows of elongated members disposed in a parallel array. The elongated members are formed from segmented tubular sections which are interconnected and are made from a cemented carbide material. The screen is especially useful in industrial applications where high abrasion resistance and increased screen life is necessary.

Abstract: A change device for sieves used for filtering plastic materials. The change device comprises a sieve holder having a bore for the throughflowing material and a slot extending transversely thereto, in which there are sealingly retained in work position sieve supports or carriers containing sieves. By means of a work cylinder it is possible, without interrupting the transport of the material which is being processed, to eject and replace the contaminated sieve by a new sieve. The rapid change device is particularly suitable for installation in an extruder for fabricating rubber hoses for automobile tires, the installation of such rapid change device advantageously being accomplished between the extruder and the injection head.

Abstract: A net or screen formed of crossing strands of an abrasion-resisting organic element and a sieve constructed with such netting or screening. The strands may be either cored or coreless. Where a core is provided it may consist of some type of metallic wire, inorganic fibre or organic polimerized elongationless strands, either solid or formed of monofilament or twisted strands. The net or screen is formed by arranging one set of strands in a plane parallel to each other and spaced apart by predetermined distances and placing a second set of strands, spaced at the same or other predetermined distances parallel to each other, transverse to and on the first set of strands. The two sets of strands are caused to adhere to predetermined points of contact by heating to a temperature at which the contacting elastomers fuse to each other. Netting or screening so formed may be employed to construct screening, such as may be employed in sieves, particularly for sifting out finer materials from coarser materials.

Abstract: An improved sorting apparatus of the harp screen variety utilizes a plurality of elongated, parallel wire spacing strips positioned along a frame and carried on individual beams which are oriented perpendicular to a multiplicity of tensioned wire lengths extending between wire retaining means at opposed ends of the frame. Each spacing strip has a substantially arcuate, convex upper face with a multiplicity of V-cross section wire receiving guideways which are equally spaced therealong to maintain a predetermined distance of separation between the wire lengths. Each guideway has an arcuate floor which has a convex arch configuration which supports the wire length at the apex of the arch and then drops downwardly to thereby minimize destructive abrasion between wire and guideway floor. The guideway construction tends to reduce wear of the guideway in lateral directions and to utilize normal wear to more firmly seat the wire in the guideway and retain desired spacing between adjacent wires.

Abstract: An improved sorting apparatus for sorting sand, rock, gravel and other fragmented material utilizes a wire screen panel having a plurality of sorting zones with the apertures of each zone having a different cross-sectional area. A multiplicity of equally spaced, parallel, serpentinely crimped, longitudinal wires extend from receiving end to discharge end of the panel and are rigidly retained by attachment shrouds at the ends, permitting the longitudinal wires to be tensioned and sagging of the wires avoided by gradually tightening and straightening the longitudinal wires. Mounting means is provided to mount the panel in most commercially available vibrating screen boxes and includes a stationary angle iron mountable at one end of the screen box to retain an attachment shroud at an end of the panel and further includes a plurality of clamping devices adjacent the remaining end of the screen box and engaging an attachment shroud at the remaining end of the panel.

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.

Abstract: A rubber screen for a vibratory screening apparatus comprises a plurality of first parallel rope members having suitable cross sectional shapes and arranged in a particle flowing direction, each of said first rope members having a tensile member composed of a strand of filament having a high elongation at break and an organic material having flexibility and/or elasticity and covering the tensile member, and a plurality of second parallel rope members having suitable cross sectional shapes and arranged in a direction normal to the first rope members, each of the second rope members having a tensile member of a material having a low elongation at break and an organic material having flexibility and/or elasticity and covering the tensile member, each point of intersection between the first and second rope members being suitably bonded.