Abstract: A screen panel retainer assembly, that is utilizable with a vibrating separatory machine, is configured with a plurality of discrete, mushroom-shaped screen panel retainers. Each such retainer has a retainer head that is generally in the shape of a portion of a cylinder, such as a right cylinder. A shank connects each such retainer head to a suitable retainer bar. The retainer bar can be adapted to be attached either to screen stringer tubes of the vibrating separatory machine, or to underlying cross tubes and end cross tubes. The screen panels, which are to be secured to the vibrating separatory machine, have complementary shaped mushroom-shaped screen panel retainer head receiving chambers in their side surfaces. Two such panel edges define a whole chamber. The retainer heads are metal whereas the screen panel edges are resilient. The mushroom-shaped heads securely snap into their complementary chambers yet can be removed from those chambers when the screen panels have to be replaced.

Abstract: A screen panel retainer assembly, that is utilizable with a vibrating separatory machine, is configured with a plurality of discrete, mushroom-shaped screen panel retainers. Each such retainer has a retainer head that is generally in the shape of a portion of a cylinder, such as a right cylinder. A shank connects each such retainer head to a suitable retainer bar. The retainer bar can be adapted to be attached either to screen stringer tubes of the vibrating separatory machine, or to underlying cross tubes and end cross tubes. The screen panels, which are to be secured to the vibrating separatory machine, have complementary shaped mushroom-shaped screen panel retainer head receiving chambers in their side surfaces. Two such panel edges define a whole chamber. The retainer heads are metal whereas the screen panel edges are resilient. The mushroom-shaped heads securely snap into their complementary chambers yet can be removed from those chambers when the screen panels have to be replaced.

Abstract: A screen panel retainer system is useable to retain a plurality of screen panels to a separatory machine. Retainer bars are attached to the screen stringer rails of the separatory machine by an expanding of spaced plugs that are received in holes in the stringer rails. The retainer bars each include a plurality of ears that are receivable in pockets that are situated on the inner faces of screen panel edge strips. A plurality of dams, each of which is securable to the screen edge strip ends of two adjacent screen panels, serve to further secure the screen panels in place. Screen panel removal is easily accomplished and the system is adaptable to various machine configurations.

Abstract: A center retainer assembly for a panel mounting system of a vibrating screen utilizes an elongated bolting bar which is encased in a resilient material that includes an elongated center retainer. The bolting bar and its encasing resilient material are situated in a channel portion of an upwardly facing retainer channel. The retainer channel is, in turn, secured by way of a mounting plate to a cross tube of the vibrating screen apparatus.

Abstract: A centrifuge screen basket mounting about an outer end portion a plurality of circumferentially spaced impeller blades in operation confronting and radially spaced inwardly of a seal ring of a centrifuge machine, the blades being uniformly tilted forwardly in the basket's direction of rotation for producing on such rotation a blast or force of air opposing and sealing against escape of fluid or other previously separated material past the basket's outer end.

Abstract: Vibrating screening apparatus in which one or more screen panels are supported between spring-mounted side plates on crosstubes and the several parts of the apparatus are connected primarily by bolting, the crosstubes by U-bolt and tube saddle clamps to framing for attaching the screen panels to the apparatus, the bolted connections by avoiding initial and residual stress and yielding as needed to operational stress imposed by vibrating mechanism of the apparatus, not only enabling the apparatus to operate for extended periods without fracture of parts but, should a fracture occur, permitting and facilitating selective removal of the fractured part for repair or replacement.

Abstract: A feed box assembly including a feed box for feeding a slurry or other mixture to a screen, the box having an adjustable gate for controlling the rate and impingement angle of the feed on a screen and seals on the gate and cooperating fixed deflectors in and on the box for preventing the fluid mixture during feeding from spewing around sides of the gate.

Abstract: A fluid actuated nut having a cylindrical casing engageable at an inner end with a base, the casing containing a coaxial relatively axially shiftable plunger having an inwardly opening partial central bore for threadedly receiving a shank of a bolt, a compression spring acting outwardly on the plunger and inwardly against the casing, and a fluid pressure chamber in the casing outwardly of the piston, the nut being applied by screwing the piston onto the bolt shank to the point of engagement of the inner end of the casing with the base and tightened by sequentially compressing the spring by fluid injected under pressure in the fluid chamber for shifting the casing away from the base, turning the casing to reengage the base and releasing the fluid pressure to expand the spring, and repeating the sequence as necessary to produce the desired tensile and/or compressive force, the nut being loosened by applying fluid pressure to advance the plunger for compressing the spring and disengaging the casing from the base

Abstract: A method of applying and removing a fluid actuated nut, the nut having a cylindrical casing engageable at an inner end with a base, the casing containing a coaxial relatively axially shiftable plunger having an inwardly opening partial central bore for threadedly receiving a shank of a bolt, a compression spring acting outwardly on the plunger and inwardly against the casing, and a fluid pressure chamber outwardly of the piston, the nut being applied by screwing the piston onto the bolt shank to the point of engagement of the inner end of the casing with the base and tightened by sequentially compressing the spring by fluid injected under pressure in the fluid chamber for shifting the casing away from the base, turning the casing to reengage the base and releasing the fluid pressure to expand the spring, and repeating the sequence as necessary to produce the desired tensile and/or compressive force, the nut being removed by applying fluid pressure to advance the piston for compressing the spring and disengagi

Abstract: In a static sieve assembly having a housing for mounting a sieve or screen, a feed box having a discharge spout for feeding material tangentially to and across the sieve, a side of the spout having flexibly connected fixed upper and movable lower parts, and an actuator on said feed box and acting on said lower part for controlling the rate of feed to the sieve by varying the area of a discharge opening of the spout.

Abstract: A method of making a frusto-conical centrifuge screen basket of side-connected segments formed of wedge-shaped screen wires connected and backed by tie bands welded thereto, in which the segments are each fabricated in the flat by clamping laterally spaced screen wires to a flat work surface and fusion welding laterally spaced tie band sections to the screen wires, and the tie band sections are so precurved and positioned during welding as to form in the finished basket a plurality of laterally spaced parallel continuous circumferential tie bands each centered on and perpendicular to the basket's axis and together reinforcing the basket against centrifugal forces imposed in service.

Abstract: Method of removing slimes from slime-containing slurries in which the slurry is force fed at an acute angle onto a downwardly directed screen surface of a welded profile wire screen having fine screen openings at a pressure which for the slime content and impact angle of the slurry on the screening surface will project water and suspended slimes from the slurry through and beyond the screen a distance sufficient to cause gravity discharge of the slime suspension free of contact with the back of the screen below the impact area.

Abstract: A screen basket for centrifugal deliquefying and/or classifying of particulate solid and solid-liquid mixtures, the basket being fed internally, rotating about a vertical axis and on initial installation presenting for driving engagement with the mixture fed into it an axially serrated internal screening surface formed by laterally inwardly and forwardly sloping bases of laterally spaced axially extending screen wires having as mixture-engaging serrations radially instanding leading edges.

Abstract: A reversible static screen for classifying and dewatering flowing slurries, the screen being inclined and having a flow or screening surface formed by laterally spaced screen wires disposed normal to the flow direction of the slurry and so spaced that the openings therebetween are narrower over the end portions than over the intermediate portion of the screen.

Abstract: A resistance welding machine for progressively welding each of a succession of transverse wires to longitudinal wires at a transverse welding station to and through which the longitudinal wires are incrementally advanced, the machine having a welding unit including a carriage mounted above the welding station for intermittent and reversible movement transversely of the machine and longitudinally of the welding station, a transformer vertically reciprocable in the carriage by a power unit mounted thereabove on the carriage, and a ram suspended from the transformer for movement in unison therewith and mounting for limited relative vertical movement a welding head carrying a front welding electrode, and a vertically movable guide bar and stationary platen, both electrically conductive and mounted independently of the welding unit, the guide bar below the ram and in advance of the welding station for guiding the longitudinal wires thereto and the platen underlying and supporting the longitudinal wires below both

Abstract: Air entrained, super plasticized concrete having a maximum bubble spacing factor of 0.008 inch (ASTM Standard C 457) and a method for preparing such concrete are disclosed. The method includes the steps of adding an air entraining agent while mixing aggregates and water, adding during the mixing a small but effective quantity of a potassium salt of a fluorinated alkyl carboxylate having a high surface activity and a pH of 8-9, and then adding a super plasticizer to the resulting mix prior to placement. The air entrained concrete having the aforesaid bubble spacing factor contains a super plasticizer, a vinsol resin air entraining agent, and a potassium salt of a fluorinated alkyl carboxylate. The fluorinated alkyl carboxylate is present in an amount of one to two parts per 100 parts of the super plasticizer on a weight basis.

Abstract: A machine for welding screens formed of spaced longitudinal screen wires welded at a welding station to spaced transverse rods, in which the transverse rods in succession are clamped and welded to the screen wires at the welding station, the screen wires are incrementally fed to and through the welding station and in advance of the welding station are engageable by a spacer for predetermining the lateral spacing therebetween, a platen supports and backs the screen wires against forces exerted thereon by the spacer and in clamping a transverse rod thereto, and laterally spaced and tilted slots in confronting end surfaces of the spacer and platen slidably receive and guide the screen wires for enabling the screen wires to be correspondingly tilted longitudinally of the transverse rods when welded thereto.

Abstract: A self-cleaning screen for separating fibrous and other solids from flowing slurries, the screen having a flow surface formed by parallel laterally spaced screen wires disposed perpendicular to the flow direction of the slurry, each screen wire having a flat rearwardly declining top bounded forwardly by an arcuately convex leading edge and rearwardly by a sharp trailing edge and downwardly converging flat sides, the screen inducing a ripple motion in the slurry flowing across the screen wires and directing solids over and liquid downwardly between the wires.