Abstract: A vibrating screen assembly supported by springs is provided which is used to size separate rock and other material. The present invention includes increasing the natural frequency of the screen assembly by stiffening the individual screen decks of the screen assembly, to enable the screen assembly to operate at higher operating speeds without prematurely failing.

Abstract: A panel for screening material, comprising: a frame defining a screening area; a tensioned fiber reinforcement attached to the frame and spanning across the screening area; and a non-tensioned resilient coating surrounding the fiber reinforcement so as to form a plurality of openings to screen the material. A method of making a screen for screening material and a vibratory screening machine apparatus incorporating such a screen panel are also disclosed.

Abstract: A screen is described wherein one end of the screen frame is provided with an upwardly open channel profile and the other end with a similar but downwardly open channel profile, such that the outboard edge of an upwardly open profile will fit within the channel of a downwardly open profile provided along the edge of an adjoining screen frame, to enable two such screens to be connected together and to enable linear movement in a direction generally perpendicular to the line of engagement and generally in the plane of at least one of the two screens, to be transmitted from one screen frame to the other. The engagement of one profile by another also serves to close the gap between the two screen frames and prevent at least particulate material from passing therebetween. Preferably the engagement prevents liquid from passing therebetween.

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: The invention pertains to a sieve bed for a sifting machine, consisting of rectangular sieve elements (10), which are attached to a support frame (1) with their edges abutting each other, the support frame being provided with mushroom-shaped mounting pins (3), each of which is provided with a head which engages in an interlocking manner in corresponding recesses (11a and 11b) of the sieve elements (10). To facilitate the assembly and disassembly of the sieve elements in a sieve bed of this type and to protect the connection from premature wear the invention proposes that the receptacle (11) for the head (4) of the mounting pin (3) be closed off at the top; that the receptacle (11) for the head (4) of the mounting pin (3) be provided at the bottom with an entrance opening for the head (4) of the mounting pin (3); and that the wall of the receptacle (11) be provided with an inward-projecting bed (12), which can be snapped under the head (4) of the mounting pin (3).

Abstract: A tool designed for separating manure, loose hay and wet bedding from the stall of an animal. The tool comprises a rectangular frame supporting a plurality of spaced parallel rods. The rods extend downwardly at an angle from a wall of the stall such that the lower ends of the rods or the portion of the grate supporting the rods extend into a receiver such as a muck bucket or wheel barrow. When refuse is tossed from a floor of the stall onto the grate, then manure, loose hay and soiled or wet bedding will flow down the grate into the receiver, while reusable bedding will pass through the spaces between the rods for later reuse. The frame is provided with side members which converge at their lower ends to funnel refuse into the container.

Abstract: The present invention is a gravel screening device for separating different sizes of gravel and stones or separating gravel and stones from larger rocks. The device comprises a screen supported by a frame with two side walls connected by a low front wall. The screen and the upper edge of each side wall slope downward toward the low front wall. The frame is approximately 10 to 12 feet in width, about 8 feet deep, and supported about 8 feet high by the side walls in the back sloping toward the front wall which is about 4 feet high. The back is open and the edges of the side walls slope outward from the tops of the sidewalls to their bases, thus accommodating a maximum amount of gravel taking into account the angle of repose of the gravel collected in the device.

Abstract: An integrated gasket and screen frame for a screen assembly for use with a vibrating shaker. The screen assembly includes a tubular frame having a top side and an under side. At least one screen cloth is affixed to the top side of the frame. A slot in the tubular frame has a width. An elastomeric gasket has at least a portion wider than the width of the slot so that the gasket may be press fit and mechanically locked into the slot and held therein.

Abstract: A shale shaker for separating material, said shale shaker comprising a basket (100) for supporting a screen assembly and a collection receptacle, the basket comprising two side walls (102), an end wall (103) and an opening in the bottom of said basket (100), said basket (100) having means (109,110) to support screen assemblies for substantially covering said opening characterised in that said basket (100) further comprises separating means (104,105,106)in or on any of said walls (102,103) for separating material. Preferably, further comprising directing means for directing separated material therefrom into said collection receptacle. The invention also provides a method for separating material using the shale shaker of the invention, a basket of the shale shaker of the invention and screen assemblies used in the shale shaker of the invention.

Abstract: Methods for making a screen assembly for a vibratory separator, a screen assembly made by such methods, and a method for separating components of a fluid with a vibratory separator with such a scren assembly; the method in certain aspects including sewing together with sewing material at least two layers of screening material (e.g., two, three, four or more layers; e.

Abstract: A screening panel 10 comprises a peripheral frame 12 consisting of a pair of mutually laterally spaced side members 14, 16, which are integral with a pair of mutually axially spaced end members 18, 20. The side members 14, 16 and end members 18, 20 define corners of the panel 22.1, 22.2, 22.3 and 22.4 and the peripheral frame 12 where they meet. A plurality of mutually spaced ribs 15 extend across the periphery of the panel 10 to define a screening surface. The side members and end members are rectangular in cross-section, thereby defining substantially flat upper peripheral surfaces 12.1, outer peripheral surface 12.2 and lower peripheral surface 12.3 of the peripheral frame 12 and thus also the panel 10. The panel 10 includes locating recesses 24 provided at or near to the corners 22.1, 22.2, 22.3 and 22.4 of the panel 10. The panel 10 also has separate securing recesses in the form of semi-circular grooves 30 formed in the lower surface 12.

Abstract: A screen system employs a resiliently mounted housing, a vibration generator mounted to the housing, a mounting frame fixed to the resiliently mounted housing and a support surface. This system receives a screen including a screen frame and pre-tensioned screen cloth. The frame includes an inwardly extending mounting flange accessible from below the screen when placed in the housing. Clips pivotally mounted relative to the mounting frame include a first rounded lever extending upwardly to selectively engage the inwardly extending mounting flange. Second levers extend downwardly to cooperate with actuators. The actuators include inflatable bodies with contacts which, upon inflation, force the clips to engage the inwardly extending mounting flanges. This engagement retains the screen on a resiliently mounted housing and is able to further tension the screen in place.

Abstract: A vibrating screen assembly having a tubular frame. The tubular frame includes a pair of opposed tubular sides and a pair of opposed tubular ends. An upstanding lip extending from each side and extending from each end forms a rim enclosure. A ledge extends inwardly from the opposed sides. A plurality of tubular cross supports and the opposed tubular ends rest on the ledge and are connected to the opposed sides. A perforated plate with a plurality of screen cloths thereon is positioned within the rim enclosure and secured to a planar surface of the frame. One of the ends includes an extending overhang while the other end includes a lower recess so that an overhang from one screen assembly will mate with a recess from another screen assembly to form a liquid tight seal.

Abstract: A screen assembly which, in at least certain aspects, has at least one wire mesh screen formed with undulating mesh material having a series of ridges spaced apart by a series of valleys, a corrugated perforated plate with an undulating shape corresponding to the undulating mesh material of the at least one wire mesh screen, the at least one wire mesh screen on the corrugated perforated plate, a series of spaced apart rods all of which are in one plane, the corrugated perforated plate mounted on the rods of the series of spaced apart rods, and each rod having a length and independent of and not connected to the other rods along its length by any member in the same plane as the rods, each rod having two spaced apart ends.

Abstract: A screen mounting basket for a vibratory separator for separating components of material introduced into the basket, the vibratory separator including a collection receptacle beneath the basket, the basket including two opposed spaced-apart side walls having first ends and second ends, the first ends spaced-apart by an end wall connected to each of the side walls, at least one opening through the end wall or one of the side walls, at least one secondary screen within or outside the basket over said at least one opening, at least one basket screen within the basket, and the at least one secondary screen and the at the at least one basket screen for separating a first component from the material, the first component flowing through the at least one secondary screen into the collection receptacle without flowing through the basket screen. The basket screen may be deleted and all fluid flow may be out from the secondary screen or screens.

Abstract: A sieve insert for a cylinder sieve machine, and especially for a tumbling sieve machine. A sieve insert is provided with the features of a level sieve onto which the material to be sieved is charged, a rebound bottom substantially parallel and arranged at an interval to the sieve and carries a plurality of rebound bodies, a sieve frame for carrying the sieve, and a carrier frame carrying the rebound bottom and the sieve frame. The sieve insert is subdivided into a series of sieve segments, in which sieve frame supports the sieve segments along their contours.

Abstract: An adjustable grizzly has a series of parallel bars which form a grate. Each bar of the grizzly is adjustable along the width of a frame. Pins on the underside of the bars drop into slots in the frame. The bars are slid into position along the frame and then locked into place by tension wedge locks. Matching spot faces on the bars with buttons on the frame further secure the bars into position and prevent lateral movement of the bars when the grizzly is in use.

Abstract: A grizzly screen apparatus has a screen of grizzly bars having first ends mounted in a transverse end member and second ends placed in a slotted comb member having alternating shallow and deep bed slots. The screen is rotatable about a transverse axis whereby the second ends of secondary grizzly bars in the deep bed slots are lowered relative to the second ends of grizzly bars in the shallow bed slots, resulting in simultaneous steepening of the screen and an increase of the interbar distance, to remove obstructing oversize objects from the screen. Each grizzly bar has a transverse lock bar at the first end which retains the grizzly bar within an aperture in the transverse end member without bolts or other fasteners. Obstructions on the grizzly screen may be cleared without the use of manually operated tools, and if desired, may be cleared by remote control.

Abstract: A screen assembly for a vibratory separator, the screen assembly including at least one lower coarse screen member, at least one upper fine screen member above the at least one lower coarse screen member and fused with plastic to the at least one lower coarse screen member, and a strip member beneath and adhered to the at least one lower coarse screen member. In one aspect the strip member includes two side strips, two end pieces, and a plurality of spaced-apart strips parallel to the two side strips each with an end terminating at, in, or on each of the end pieces.

Abstract: A sieving device with a vibratory supporting frame and a vibration frame which is held against said supporting frame so as to be able to vibrate freely. A simple, compact design which provides good sieving and conveying performance is achieved in that the vibration frame is spring-elastically coupled to the supporting frame by torsion-bar-like spring elements.

Abstract: A support strip has been invented for supporting part of a screen used in a vibratory shaker, the support strip having a support body having spaced-apart ends spaced-apart sides, and a top surface, and at least one hump, raised portion or upturned finger projecting above the top surface of the support body and a support beneath said at least one hump, etc. The support may be entirely beneath the hump, etc. or part thereof may project beyond the hump, etc. The present invention also discloses a variety of screens and screen assemblies with such structure.

Abstract: A system is provided for screening or diverting particulate material. The system comprises a plurality of posts which removably and interlockingly support at least one novel reinforcing support frame and at least one novel module for screening or diverting particulate material. Each module comprises either a screening member having an array of sieve apertures of a predetermined size defined therein for allowing particulate material up to the predetermined size to pass through the module or a diverting member or redirecting the flow path of the particulate material. Each reinforcing support frame is interlockably mounted onto the posts, and is readily detachable therefrom. Each module is disposed on the interlocking posts and is mounted onto, and readily detachable from, the reinforcing support frame. Each module is further positioned on the frame such that any particulate material passing through the module passes through the frame.

Abstract: A screen panel module for mounting on a screen deck frame for screening, separating and grading materials such as ores. The module comprises a stiff frame component for supporting a resiliently flexible screening surface provided by a panel component. Opposite sides of the panel component include depending flanges having ribs for seating in complementary grooves in sides of the frame component for removably mounting the panel component on the frame component. The module includes means such as ribs, grooves, beads or the like, preferable associated with both the panel and frame components for interengaging with fixing means for locating and fixing the module to a screen deck frame. Whereas the whole of a prior art screen module has to be exchanged when worn, the invention allows the exchange of one component of a module, namely the panel component, which component costs a fraction of the whole module.

Abstract: The invention relates to a sieve frame for plan sifters and also to a method of producing it. It is used mainly in plan sifters for milling. The object is to improve the functionality of an insertable sieve frame and to simplify production.

Abstract: A grizzly screen apparatus has a screen of grizzly bars having first ends mounted in a transverse end member and second ends placed in a slotted comb member having alternating shallow and deep bed slots. The screen is rotatable about a transverse axis whereby the second ends of secondary grizzly bars in the deep bed slots are lowered relative to the second ends of grizzly bars in the shallow bed slots, resulting in simultaneous steepening of the screen and an increase of the interbar distance, to remove obstructing oversize objects from the screen. Each grizzly bar has a transverse lock bar at the first end which retains the grizzly bar within an aperture in the transverse end member without bolts or other fasteners. Obstructions on the grizzly screen may be cleared without the use of manually operated tools, and if desired, may be cleared by remote control.

Abstract: A modular deck support framework system employing support tray framework sections for vibrating screens having an essentially rectangular outlined perimeter framework. Each support tray perimeter framework has at least: two opposed side framework members and a square cut cross-angle 50, or notched end angle 62, as a feed end cross framework member; and a square cut flat stock 52 or curved top flat stock 52C as a discharge end cross framework member. Square cut cross-angle 50 is oriented such that square cut cross-angle upper leg 50U is pointing essentially upwards and essentially perpendicular to the flow of particles over support trays, and square cut cross angle lower leg 50L is pointing essentially with the flow of particles over support trays. Notched end angle 62 is oriented similarly whenever employed.

Abstract: A vibratory screen system including a screen assembly having screen cloth on both the top and the bottom of the frame. The screen cloth on the bottom has openings larger than and up to five times the size of the openings on the upper screen cloth. A pattern of dividers divide the screen into compartments. The screens are bonded to the frame and to the pattern of dividers.

Abstract: A screening arrangement support frame component in which a pair of complementary elongate component members have body portions and cavity defining formations. The component members are secured side by side to one another such that the body portions abut and the cavity defining formations register to form a plurality of cavities for receiving socket elements. A plurality of socket elements, each defining a socket for receiving a protrusion that secures a screening panel to the component, the socket elements being mounted in the cavities when the component members are secured to one another. The thickness of each support frame component at the locations where the body portions abut is smaller than the cross-sectional dimension of the socket elements mounted in the cavities.

Abstract: Screening apparatus for screening, separating or grading materials such as ores or the like includes a screen deck frame (3) which supports at least two adjacent screen panels (2). Each screen panel (2) includes a longitudinally extending arm (20) connected to a side face (19) of the panel by a cantilever section (22). The adjacent screen panels (2) are secured in position by virtue of the arms (20) being clamped between a rail type fixing member (4), which is fixed to the screen deck frame by bolts (9-11), and a rail type retaining member (5). Retaining member 5 has a cover portion (27) that overlies the joint between the adjacent screen panels to prevent the entry of ore fines into the joint. Embodiments are described wherein the arms may extend upwardly or downwardly, and wherein the upper surface of the cover portion of the retaining member may lie flush with the upper surface of the screen panels.

Abstract: A system for fixing screen panels to a screen deck frame of an ore screening apparatus. An elongate fixing rail extends over the screen deck frame along and between side edge regions of a pair of adjacent screen panels. The fixing rail, in use, is non-interconnecting with the screen panels. An elongate retaining strip extends along the fixing rail, and engages the side edge regions of the screen panels in an overlying relationship. The retaining strip is connectable to the fixing rail so that the retaining strip secures the screen panels in position against upward movement away from the screen deck frame.

Abstract: Detachable screen cloths (14) are fixed on a screen cloth element (11) having a rigid support frame (12, 13) serving as a holder and intended to be fixed in the screen frame (10) of a screening machine. The detachable screen cloths (14) have a rigid screen cloth frame (30, 31) surrounded at least partially by elastomeric material. The rigid mounting frame (12, 13) of the screen cloth element has a guide device (32, 33) which is laterally open for receiving and holding the screen cloth (14). The screen cloth (14) is in sliding engagement with the guide device (32, 33) during the insertion thereof into the guide device. The screen cloth (14) and the guide device (32, 33) have inter engaging surfaces preventing, during the screening operation, relative movements between the screen cloth (14) and the rigid mounting frame (12, 13) of the screen cloth element in directions making an angle with the plane of the screen cloth.

Abstract: A new type of filter assembly which can be employed to retrofit an existing shaker or which can be built as an integral part of a new shaker. The assembly is comprised of a series of compartments arranged in cascading fashion within the shaker. Each compartment is provided with a removable hookless corrugated filter having no additional support backing which secures between a perforated bottom of the compartment and a removable and reclosable lid. Each filter is sealed and supported from below, at its front and rear edges and along its sides within its respective compartment upon removable corrugated lips provided in each of the compartments. Each lid is provided with a plurality of downwardly extending parallel blades which coincide with and engage valleys of the corrugated filters to seal and support the filters within their respective compartments when the lids are closed.

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 screen support frame component is provided. The screen support frame component supports modular screening panels which are of a hard wearing synthetic plastics material such as polyurethane and are removably secured to the screen support frame component. Each of the screen support frame components includes a base which is elongate plate having a planar surface. A plurality of lugs are longitudinally spaced along the length of the base and project laterally on both sides of the base so that the planar surface of the base extends onto the laterally projecting lugs. A plurality of tubular spacer elements are provided on the base and on the lugs to project upwardly from the planar surface. Each tubular spacer element has a tubular side wall and one open axial end. It further has an annular shoulder inwardly of the open end, and a sloping face flaring outwardly towards the open end. The annular shoulder constitutes a securing formation for securing the screening panels to the screen support frame.

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 separating apparatus is disclosed for separating debris from materials. The apparatus includes a container which defines an opening for the flow therethrough of the materials. A frame is disposed adjacent to the opening. The frame has a first side which is pivotally connected to the container about a pivotal axis. A second side of the frame is disposed remote from the first side. A separating device is pivotally secured to the frame about a further pivotal axis. The separating device extends across the opening between the first and second side of the frame when in a first disposition thereof. An actuator co-operates with the separating device for permitting movement of the separating device to a second disposition thereof away from the frame and the opening.

Abstract: A large or square plansifter has a large number of sieve stacks with e.g. more than 20 sieve boxes. Such boxes are constructed without a supporting grating and design so as to be exchangeable in the covered state and so that they can be placed on or in the sieve frames. A free product fall-through space or discharge space is accordingly formed between the sieve screen and a flat base plate. The sieve cleaners are placed on or in the flat base plate. In a particularly preferred manner, the sieve frames are constructed as metal frames. The sieve cleaners clean the sieve screen and clear the product from the base plate. The sieve cleaners preferably have 2, 3 or 4 arms.

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: The invention provides for a support member for a screen support frame for supporting thereon removable screening panels, the support member including securing formations which are removably inter-engageable with complementary securing formations on a screening panel. It further includes lugs extending transversely from the support member and including securing formations which are removably inter-engageable with complementary securing formations on a screening panel. The support member supports a screening panel along one peripheral side of the screening panel, and the lugs support the screening panel along a part of a transversely extending peripheral side of the screening panel.

Abstract: A system for screening or diverting particulate material includes replaceable screening or diverting modules mounted to a rigid frame by lock pin assemblies is provided. The lock pins are fixed into mounting holes in the frame and interlockingly and removably engage recess apertures in the sidewalls of the screening or diverting modules so that the lock pins remain fixed to the frame while allowing the modules to be removed and replaced as required due to wear or to change sieve size. The lock pin assembly comprising an elongate connector strip having first and second major opposite surfaces, a plurality of lock pins joined to the first major surface, and connectors joined to the second major surface for connecting the lock pin assembly to the frame. The lock pins includes devices for interlockingly and removably engaging the attachment apertures to maintain the positioning of each screening or diverting module on the frame when the lock pin assembly is attached to the frame.

Abstract: The invention provides for a sieve bend panel of synthetic plastics material which has a screening surface and a plurality of sides and fasteners fast with and projecting from two of its sides. The fasteners are complementary to each other so that fasteners on similar panels placed adjacent to the panel can engage with the fasteners on the two sides to thereby locate the panels side-by-side and to fasten the panels to each other.

Abstract: A pulp dryer screen assembly includes a rectangular screen, a rectangular frame having four interconnected, elongated frame members and four support members, each support member being adjacent a frame member and aligned therewith. The screen has a taut inner portion and surrounding edge portions clamped between the frame members and adjacent support members. The inner portion of the screen has a pulp fiber collecting surface which has an upstream side with respect to air flow and extends along a plane. The frame and support members are entirely on a downstream side of the plane opposite the upstream side. Preferably the frame members are square tubes, and the support members have orthogonal Z-sections for small screens, and at least two orthogonal W-sections for large screens. The screen is tightened within the frame by drawing opposite support members away from each other to clamp edge portions of the screen between the support members and the frame. The support members are then connected to the frame.

Abstract: A system for screening particulate material includes replaceable screening modules mounted to a rigid frame by lock pin assemblies is provided. The lock pins are fixed into mounting holes in the frame and interlockingly and removably engage recess apertures in the sidewalls of the screening modules so that the lock pins remain fixed to the frame while allowing the modules to be removed and replaced as required due to wear or to change sieve size. The lock pin assembly comprising an elongate connector strip having first and second major opposite surfaces, a plurality of lock pins joined to said first major surface, and connectors joined to the second major surface for connecting the lock pin assembly to the frame. The lock pins includes elements for interlockingly and removably engaging the attachment apertures to maintain the positioning of each screening module on the frame when the lock pin assembly is attached to the frame.

Abstract: An assembly comprises a rectangular principal frame (12) of moulded plastics material and subdivided by crosspieces (14, 16) to form sub-areas (18). Each sub-area receives as a releasable snap-fit a plastics moulded insert (20) in the form of a sub-frame carrying one or more tensioned screen meshes (FIG. 1). A peripheral sealing gasket may seal the joint between each sub-area (18) and the insert (20).

Abstract: A screen formed of a screen frame (10) with screen cloth elements (11) mounted after each other. The screen cloth elements (11) are fixed in the screen frame by snap lock (16, 17; 18). One part (16, 17) of the snap lock is integrally formed with the screen cloth element (11) and arranged adjacent one end thereof. The other part (18) of the snap lock is a thickened portion at the upper edge of a supporting element (19) in the screen frame (10). The opposite end of the screen cloth element rests on a projecting abutment surface (20) on the supporting element (19) and is clamped between this abutment surface and a projecting edge portion (22) of the preceding screen cloth element.

Abstract: A system for screening particulate material includes replaceable screening modules mounted to a rigid frame by lock pins. The lock pins are fixed into mounting holes in the frame and interlockingly and removably engage recesses in the sidewalls of the screening modules so that the lock pins remain fixed to the frame while allowing the modules to be removed and replaced as required due to wear or to change sieve size. A split lock pin is provided for removably connecting the module to the frame along an outboard edge of the frame while maximizing screening area. An improved elongate frame member is arranged to avoid abrasive wear of the frame.

Abstract: Modular screen panels are secured to the metal deck of a vibratory screening unit by magnets embedded in the panels. Locating holes for precise location of the panels are obviated since a plurality of magnets are mounted in the panels at suitably spaced positions, preferably adjacent the perimeter thereof.

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: The invention provides for a screening panel of a synthetic plastics material which has a screening surface and plug socket connections adapted to secure the panel releasably in a side-by-side relationship with similar panels. The panel includes a spacer element along one peripheral edge of the panel and extending in a direction transverse to the screening surface of the panel and being integral and unitary with the panel so that in side view the panel is substanitally L-shaped. The spacer element is adapted to space the screening surface of the panel from a second screening surface substantially parallel to the screening surface of the panel to thereby form a double screen deck supported on the same support frame.

Abstract: There is provided a screening panel having screening apertures and which can be secured to a support frame side-by-side with similar panels to form a screen deck. The panel has ridges along two of its sides which project above the screening surface. The ridges form a channel which confines liquid flowing across the screen deck to flow across the screening apertures. Grooves extend through the ridges to direct liquid flowing across the screen deck directly into the screening apertures.