Abstract: A method for casting a plastic die including constructing an open ended container having a floor configured to the desired contour shape of the die. The open ended container is segmented by longitudinal members and traversing members. A plurality of box-shaped cores are spaced within the container and secured in place by the traversing members. A cavity is formed in the container therebetween for the injection of hardenable material.

Abstract: The invention relates to concrete form panel sheeting comprising a resinous polymer core defining a concrete-form face and an opposite face, and a concrete-facing surface layer attached to the concrete-form face, the concrete-facing surface layer being adapted to be contacted by fresh concrete and to release from the concrete after curing thereof, to facilitate reuse of the concrete form panel sheeting. The invention further relates to concrete forms and form networks having the inventive concrete form panel sheeting as a component therein. The invention also relates to applications using the sheeting and forms to pour concrete.

Abstract: A model for a casting mold, particularly for the casting of blade wheels for turbo-engines, includes multiple cores which can be fitted into one another. The cores have exterior rings, portions of blade duct cores and connector plates. The portions of the blade duct cores supplement one another.

Abstract: A method and mold for making a wheel of a roller skate including a plurality of circumferentially spaced apart generally axially extending curvilinear paths. A speed skater, traveling a predominately circular course with such wheels properly aligned on such skates, is able to use air moving past the skater to increase skating speed. As air enters the curvilinear paths of the wheel the direction of air flow changes. In this manner, momentum is transferred from the moving air to the spinning wheels, thus increasing the number of revolutions of the wheel and the speed of the skater. The mold may be formed of polyurethane and use flexible fingers to form the curvilinear paths of the wheel.

Abstract: The mold comprises an outer mold part (10) which defines a mold cavity (11). Walls of the outer mold part form the outer surface of the combined engine block and cylinder head. There also are first and second inner mold parts (12, 13) which extend into the mold cavity and are maintained a distance from each other. Each of the first and second inner mold parts have a cylindrical portion (12a, 13a) which, during the casting procedure, forms the cylinder bores in the engine block. The first and second inner mold parts (12, 13) also each have an upper portion (12b, 13b) situated above the cylindrical portion. During the casting procedure the upper portions form portions of a combustion chamber common to the cylinder bores. The mold further includes an third inner mold part (15) which extends through the outer mold part (10) and cooperates with the first and second inner mold parts (12, 13) to form the combustion chamber during the casting procedure.

Abstract: A plurality of pilot hole impressing molds connected to a generally flat base structure constructed of resilient materials temporarily attached to the inner face of the temporary forms for the formation of the concrete structure. As concrete sets the forms and the pilot molds are removed exposing the pilot holes. Pilot mold extensions may be modified with metal caps temporarily attached. As concrete sets and forms and molds are removed, the metal caps remain permanently embedded in the concrete structure.

Abstract: A mold for casting an inverted base section of a manhole includes a core for forming an inner surface of the base section, and a jacket surrounding the core for forming an outer surface of the base section. A domed plate atop the core but below an upper edge of the jacket, and having a peripheral shape corresponding to that of the core, seals off the interior of the core and produces the floor shape of the base section. A trough former is placed between opposite interior sides of the jacket and above the domed plate. The flanges of the trough former are cut along arcs conforming to the shape of the domed plate so that cementitious material poured into the mold does not leak between the domed plate and the trough former. Hole formers are similarly seated atop the trough former.

Abstract: A reusable low maintenance forming system for forming concrete floors, ceilings and walls with joists thereunder utilizes concrete displacement form pans supported by a temporary framework and floor. A plurality of alignment channels are arranged in parallel series of elongate aligned rows and are adapted to alignably receive and support the flanges of parallel and adjacent form pans. A plurality of joist bottomed wedges are arranged in parallel series of aligned rows and adapted to fit within the alignment channels as to abut and seal against the lower free ends of the form pans afterwhich uncured concrete may be placed over the system.

Abstract: The mold is comprised of a bottom (4) wherein there are provided grooves (8) extending transversely between containment sidewalls (6); said sidewalls (6) have windows (14) which are aligned with the grooves (8) which preferably are delimited by the faces (10) of fillets (12) arranged in parallel, facing each other and fixed to the bottom (4) of the mold.

Abstract: A fluid pressure regulator includes a diaphragm operated leakport controlling low liquid or fluid flow rates. A precisely formed leakage unit spaced from the leakport establishes continuous flow from the input to the output. The leakage unit includes a separate orifice unit having an integral molded body and internal precision orifice establishing the continuous flow. A multiple mold core unit for molding an integral body and orifice including a pair of aligned mold cores have opposed planar surfaces located at the orifice plane. A small gap is held between the opposed end surfaces. The orifice unit is molded as a single plastic element without flash at the orifice. The orifice has a diameter in the range of about 0.001 to 0.030 inches, and may be used in various applications requiring precise low flows. The orifice unit may include an elongated tubular body with an internal orifice molded as single integral members.

Abstract: A test mold assembly for evaluating the surface deformation tendency of a coverstock bonded to a reactive plastic formulation to voids in the formulation including a base adapted to support a coverstock and spaced side walls extending upwardly from the base to define a mold cavity for receiving foam precursors. The assembly further includes a lid adapted to form the top of the mold cavity and having a cover portion disposed spaced from the base. The lid includes a plurality of integral projections extending downwardly from the cover portion into the mold cavity a predetermined distance to create voids in the foam. A method of making a foam void model for evaluating the surface deformation tendency of a coverstock bonded to a reactive plastic formulation to voids in the formulation is also disclosed.

Abstract: A method for making concrete cored bricks and capping bricks includes providing a mold having a row of mold cavities separated by cross members having core-bar holes formed therein, inserting a core bar through each cavity and into and filling a core-bar hole associated with rear cavity. Next, a rear core-bar hole is plugged and the cavities are filled with a concrete to form plural uncured bricks. The bricks are then compacted and an elongate, interconnecting pattern is pressed into a first surface of each brick. Next, the core bar is removed from the cavities and the bricks are ejected from the mold. Finally, plural wet layers of colored coatings are applied to the first surface of each brick after which the bricks are cured. Antiqued concrete capping brick including a top surface, four side surfaces, and a bottom surface having formed therein at least one recess are also formed. Additionally, a first side surface of the brick includes elongate, interconnected indentations that extend to the edges thereof.

Abstract: A plurality of pilot hole impressing molds connected to a generally flat base structure constructed of resilient materials temporarily attached to the inner face of the temporary forms for the formation of the concrete structure. As concrete sets the forms and the pilot molds are removed exposing the pilot holes. Pilot mold extensions may be modified with metal caps and temporarily attached. As concrete sets and forms and molds are removed, the metal caps remain permanently embedded in the concrete structure.

Abstract: A method and apparatus for forming a curb section of a predetermined length sub-divided into modules by transverse grooves which give the appearance of shorter blocks and provide for fracturing the curb section at those locations. Each module of the curb section includes a rearward fastening projection having a vertical bore for passing a nail to engage the curb section to pavement or other base. Such linear mold sections are all that are required when a curve is dictated. The mold sections are sub-divided into the modules to form the curve. The apparatus includes an open frame moving vertically against a platform and mold shoes for pressing down on the concrete when poured in the mold frame, including plugs for forming the tops of the fastening projections. According to the method, the plugs are removed after the mold frame is lifted, and then the shoes are removed to leave the formed curb sections on the bottom wall.

Abstract: A unitary helical coil spring assembly is inserted in a tubular body to form a neon tube support. The assembly is molded of plastic using a mold comprised of two planar blocks in each of which there are a series of axially spaced apart recesses configured to form half convolutions of a spring and there are projections having rounded ends projecting from between half convolution recesses on each mold block which interdigitate and project into the half convolution recesses in the opposite mold block when the planar surfaces are interfaced so the rounded ends cooperate to form a circular inside diameter of the spring when plastic is injected in the recesses.

Abstract: An integrally molded cross-flow fan has a circular array of angularly spaced, radial vanes. The cross-flow fan is molded with a molding assembly having a plurality of gap-forming molds jointly defining mold cavities for forming the vanes. A molten resin material is supplied into the mold cavities to mold the cross-flow fan. Thereafter, a first group of gap-forming molds are withdrawn radially outwardly from between the molded vanes, and after elapse of a period of time, a second group of gap-forming molds, which alternate with the gap-forming molds of the first group, are withdrawn radially outwardly from between the molded vanes. The gap-forming molds of the first group are simultaneously withdrawn radially outwardly, and after elapse of the period of time, the gap-forming molds of the second group are simultaneously withdrawn radially outwardly.

Abstract: Injection molding methods and apparatus for the production of casting molds for toric lenses having ballast oriented properly with respect to the cylinder axis of the toric surfaces. A calibrated rotatable ring mechanism is used within the injection molding body, for producing a slot or other alignment means on the lens casting mold at a point which is offset a predetermined number of degrees from the axis of the toric surfaces being formed in the casting mold. When the casting mold containing a newly cast lens is mounted on a precision lathe, the mating of the slot with a permanent ridge on the lathe spud ensures that the mold seats on the lathe at the same established place each time with respect to the position of the cutting tool. The offset between the toric axis and the position of the cutting tool has already been established, and therefore there is no need for the lathe operator to make any measurements or resetting of the cutting tool.

Abstract: A CM block machine for casting masonry blocks includes a mold cavity formed between a mold box and a mold core containing one or more plungers selectively extending laterally into the cavity along a second axis which is normal to the axis of casting so as to form openings extending through portions of the block in the direction of the second axis. The plunger(s) is disposed in a cartridge housing contained within the mold core. An oversized vibrating ring wiper mounted in the cartridge housing engages the external periphery of the plunger to prevent CM material from entering the cartridge during plunger retraction. The plunger includes an annular relief chamber formed in a side wall thereof to provide an additional volume of air from within the cartridge to an air passage communicating with the plunger end face to prevent vacuum from impeding plunger retraction.

Abstract: The biaxial CM casting apparatus utilizes one or more main mold cores having an automatically extensible and retractable plunger or like structure extending laterally into the mold cavity from the one or more main mold cores along an axis substantially orthogonal to the axis of casting during certain selected phases of the CM casting process to form one or more openings or other structural changes in the casted concrete which openings or changes extend in the direction of a second axis normal to the casting axis.

Abstract: A mold die includes a hexagonal base having six sides and six vertices disposed around an axis, and a tetrahedron having an apex aligned with the axis of the base. The base is integrated with the tetrahedron to form three congruent parallelogram walls, one vertex of each parallelogram wall being coincident with the apex of the tetrahedron, the other three vertices of each parallelogram wall being aligned with respective vertices of the base. The die further includes slots extending into the parallelogram walls parallel to the axis of the base. The die forms a tetrahexagonal walled cavity of a truss structure corresponding to the shape of the die, whereas the slots form perpendicular walls which structurally interconnect the apices of adjacent cavities and increase the rigidity of the truss structure.

Abstract: A segmented mandrel is adapted for use in fabricating large diameter, light weight articles (such as aircraft component structures) made of thermosetting composite materials by placing fiber on the external surface of the mandrel followed by autoclave curing of the composite materials. The segmented mandrel is composed of a center shaft extending lengthwise through the mandrel, four mandrel segments mating together along a seam between their respective adjacent edges, T-stiffeners for fastening the mandrel segments together, and bulkheads rigidly mounted around the shaft and connected to the stiffeners. This segmented mandrel is reusable, is easily assembled and disassembled, and has a system that creates a vacuum seal between mandrel sections while at the same time retains the functions of support and alignment of the mandrel segments carrying the parts being cured.

Abstract: A die having a plurality of walls for making a structure includes a die apex, a tetrahedron having tetrahedron edges and a tetrahedron apex that coincides with the die apex, and a hexagonal base located on the opposite end of the die from the die apex. The base is integrated with the tetrahedron such that three walls of the die are parallelograms having parallelogram edges, a first parallelogram vertex of each parallelogram wall intersects the tetrahedron apex, and the opposing second parallelogram vertex of each parallelogram intersects a base vertex. The parallelogram edges are milled down to allow plastic to flow between adjacent edges during a molding process and thereby form a truss structure comprising angled struts. A groove may formed in the parallelogram walls such that the groove joins a third parallelogram vertex with an opposing fourth parallelogram vertex in the parallelogram wall to form horizontal struts in a central portion of the structure.

Abstract: An elastomeric-covered shrouded impeller having a pair of disk-like shrouds enclosing vanes and vane passages which has an improved throat opening having sweeping internal sidewalls is disclosed. A three-piece mold core is utilized to form the vane passage and the sweeping curved throat inlet of the impeller.

Abstract: A single-block central plunger is manufactured, which is particularly suited for the production of boxes made of plastic material for electric accumulators. The mould includes a mobile plate (3) supporting some lateral cores (5) and a fixed plate (2) supporting a fixed central plunger (7), wherein the mobile plate (3) moves co-axially in relation to the fixed plate (2) by sliding on some guiding columns (4). The fixed central plunger (7) supported by the fixed plate (2) is made from a single block and its cores (8) are obtained from the same block, as well as its box angle-plate (11), preferably by machining them with wire cutting spark erosion tool machines.

Abstract: An improved composite metal-elastomer styled automotive-type wheel with a three-dimensionally contoured ornamental outboard face formed by a plastic overlay body permanently adhered or affixed to the outboard face, and an improved molding apparatus and method for constructing such a wheel. A plastic overlay body has an annular row of outboard pockets disposed in radially offset, axially overlapping relation with a annular row of inboard pockets which in turn register with vent openings in the disc to thereby provide air passages through the wheel for brake ventilation. The outboard pockets preferably are disposed radially remote from the center of the wheel close to the wheel rim, and a relatively thin cross-section of plastic material is molded so as to overlie the outboard rim flange to provide a full-face appearance to the wheel.

Abstract: Apparatus is provided for arch centering for slabs formed on prefabricated beams of reinforced or prestretched concrete, steel, wood, or the like, which includes elements of steel plate or another material having similar properties, constructed in a flat or arched form and with the dimensions that are required, which has four or more steel staples for its temporary support during its use, and two devices, one of which allows the staples to be slightly deformed in an elastic manner for their extraction and another for their leveling and coupling among themselves.

Abstract: Apparatus and method for forming a three dimensional injection molded article having a pair of passageways extending therethrough and with a locking indentation in each passageway using first and second mold parts each having open ended cavities having an end wall and a plurality of sidewalls formed therein wherein a pair of fixed arms are mounted on the end wall of the first mold part so that they are spaced from each other and each of the sidewalls, have portions extending out of the open ended cavity and have contoured surfaces and wherein a pair of movable arms are mounted on the end wall of the second mold part for rotation about fixed axes and are spaced from each other and from each of the sidewalls and wherein each movable arm has a contoured surface adapted to be moved into a continuous contacting relationship with the contoured surface of one of the fixed arms and when in the contacting relationship to provide protruding portions to form said locking indentations.

Abstract: An improved method of manufacture is provided for producing a channeled wall thrust nozzle (10) of the type used to define a thrust chamber (12) in a jet or rocket engine. The method utilizes a precision formed mandrel (20) having an external geometry conforming generally to the converging-diverging shape of the desired thrust chamber (12), and further including longitudinally extending slots (24) for receiving channel separation ribs (26) which may be formed by die cutting from sheet stock. The channel spaces (16) between the separator ribs (26) are filled with a removable casting material (30) such as wax, and an outer housing shell (32) for the thrust nozzle is mounted about and secured to the separator ribs. The mandrel (20), which is transversely split at the throat of the thrust chamber (12), is then removed to expose the radially inboard margins of the separator ribs (26) for precision machining, followed by mounting of an inner housing shell (34) to the separator ribs.

Abstract: This disclosure illustrates and describes a test mold for the quantitative measure of the effects of formulation and/or process variable changes on some kinds of surface problems of a molded part caused by different degrees of imperfection or voiding underneath the part surface. The molded part can be single component or composite, solid or foamed. One example of the surface problem is the so-called "measles or cellulite" problem observed on the vinyl surface of a vinyl/foam composite due to the voids or rattiness within the foam. To accomplish this result, the mold has various sized, spaced apart, aligned openings formed in each of the front and rear walls of the mold, but with the centers thereof at different elevations in the respective front and rear walls. Removable rods inserted through the aligned mold wall openings produce longitudinal openings through the part which is molded around the rods, permitting the effect thereof on the surface of the molded part to be evaluated.

Abstract: A method of simultaneously manufacturing a plurality of concrete beams having upper and lower flange parts which are separated by a web part and which extend over a whole length of the beams. The method includes the steps of providing a first form part constituting a bottom part including a plurality of elongate mutually spaced recesses where the recesses have a shape corresponding to the outer portion of the upper flange part of the beams and providing a plurality of elongate intermediate members having a plurality of projections extending from opposing sides thereof which are placed on the bottom part between the recesses such that the lines of contact between the intermediate members and the bottom part are displaced from the bottoms of the recesses. In this manner, when the concrete is poured into the chamber formed by the intermediate members and the bottom part, flash is not formed on the outer portion of the upper flange part of the beams formed by the first form part.

Abstract: A collapsible core and molding apparatus and method for molding a plastic article having an undercut and a non-undercut portion. The collapsible core includes a center core pin and a core sleeve about the core pin and with the core pin having a small plurality of alternating, uniform, narrow, non-collapsing segments secured to the center pin and the same plurality of uniform, alternating, wider, arcuate, collapsing segments secured to the core sleeve, the wide collapsible segments adapted to move between the non-collapsed segments to form the expanded position for a molding operation where the wide segments are separated by the narrower segments, and a collapsed position where the collapsible segments collapse radially inward on the axial withdrawal of the center pin to form a generally cylindrical, cross section, arcuate area and to permit the ejection of a small molded plastic article from the mold.

Abstract: A method is disclosed for molding thin gel slabs horizontally having deep, large volume sample wells molded integrally and in communication with the thin gel slab. The disclosure includes a method for molding at least two contiguous thin gel slabs horizontally.

Abstract: The biaxial CM casting apparatus utilizes one or more main mold cores having an automatically extensible and retractable plunger or like structure extending laterally into the mold cavity from the one or more main mold cores along an axis substantially orthogonal to the axis of casting during certain selected phases of the CM casting process to form one or more openings or other structural changes in the casted concrete which openings or changes extend in the direction of a second axis normal to the casting axis.

Abstract: A base for holding a plaster of paris model for a set of teeth for the production of dentures, including a planar bottom to which is attached an upright circumferential exterior wall in the shape of a jaw. The base further includes perpendicularly projecting guide elements extending up from the bottom surface. The guide elements are tapered in the direction away from the bottom surface for example in the shape of a frustropyramid or frustocone and form at least one curved row which follows the curvature of the exterior wall in a U-shaped configuration. In preparing the plaster model within the base, the guide elements form corresponding holes in the plaster. The device may have a second U-shaped row of guide pins extending from the bottom surface to further guide and align the plaster mold when inserted into the base portion. This base then allows for the removal and reinsertion of a plaster of paris mold while maintaining the original and critical alignment of the model and or the individual pieces thereof.

Abstract: Concrete molding apparatus that includes an integral lattice frame having a first set of elongated expanses extending in one direction on the frame and a second set of elongated expanses extending transversely of the first set. These expanses define openings in the lattice frame and tub molds are detachably mounted in these openings. In the mounting of a tub mold, a retaining bar structure is provided paralleling an expanse in one of said set of expanses and detachable fasteners distributed along the length of a bar structure detachably fasten the bar structure to the expanse of the lattice frame.

Abstract: Cylinder block molding apparatus includes two series of parallel and alternate molding plates for partitions. The plates extend in planes perpendicular to the axis of an engine shaft. Each series of molding plates is mounted, respectively, on a support capable of sliding parallel to the axis of the engine shaft relative to the cylinder block between a molding position where mutually confronting molding faces of two consecutive plates bear against one another and a lifting position where the molding faces are moved apart as a result of sliding of the supports.

Abstract: Apparatus for the production by powder metallurgy of a heat exchanger block in which two spaced concentric half shells are provided with holes in which profiled pipes are inserted. The profiled pipes are internally supported by pins when metal powder is injected into the hollow space between the half shells for forming a wall section of a header. The radially outer half shell is formed by a plurality of half rings arranged with their side faces in contact with one another and the half rings are individually removed after the wall section is formed.

Abstract: A method and apparatus for making a composite styled wheel of the type including a metallic disc and rim and an ornamental plastic overlay permanently affixed to the disc. A disc and rim subassembly is placed in a mold. A retainer is formed as a separate part and releasable secured in the mold. A reactive plastic liquid mixture is injected into the mold cavity and the retainer is engulfed in the plastic material and permanently secured to the plastic overlay.

Abstract: A method of moulding racquets to define stringing holes in the moulded frame. The method includes forming at least one approximately ladder-shaped member having two side pieces interconnected by rung pieces, with the side pieces substantially conforming to the curved shape of at least part of the frame of the racquet; entrapping the ladder-shaped member between two mould plates defining a mould cavity; injecting a plastic material into the mould cavity to mould the frame around the rung pieces; and forming the ladder-shaped member in two parts and separating the two parts after the frame has been moulded to remove the ladder-shaped member from the moulded frame.

Abstract: A moulding pallet for moulding building blocks with interlocking surfaces comprises a metal sheet bent to form parallel ridges and valleys, with transverse sheet metal channels inserted through openings in the ridge sides forming transverse secondary ridges.

Abstract: An electrical shunt includes a U-shape contact having a unitary body molded directly in a housing into which pin contacts may be inserted for connection to and via the shunt.A method of making an electrical shunt formed of an electrically conductive contact having plural contacting portions for connection with respective external members inserted to connection therewith and an electrically non-conductive housing includes molding electrically non-conductive material directly to at least part of such contact to form such housing, whereby such housing and contact form an integral structure, including forming relatively open chamber areas within the housing for exposure therein of such contacting portions, and forming an opening in such housing for insertion therein of respective external members for electrical connection with respective contacting portions.

Abstract: A core form is disclosed for casting a structurally reinforced concrete structure for use on a slab with an outer container form having rigid walls extending vertically comprising a casting core positioned internal the outer form and having vertically extending resilient walls defining an within contiguous core wall. The walls of the outer form and the walls of the casting core are spaced apart to define a mold cavity therebetween. A form base supported by the slab is positioned within the mold cavity to releasingly support the concrete structure to be formed and cured within the mold cavity. The walls of the casting core include an upper and lower periphery such that in use the lower periphery abuts the form base to seal the concrete internal the mold cavity relative the periphery and form base. The internal contiguous core wall is retractable to enable the placement of the reinforcing structure within the mold cavity.

Abstract: In production of synthetic plastic molded parts, a sprue part is separated from the molded part by one displacing slider which cooperates with one limiting surface and displaces a sprue film from a sprue gap between a sprue passage and a mold nest, while an overflow part is separated from the molded part by another displacing slider which cooperates with another limiting member and displaces an overflow film from an overflow gap between the mold nest and an overflow passage.

Abstract: A transfer film comprising a base film and a releasant layer, an ink layer and an adhesive layer laminated on the base film in this order is inserted into a cavity of an injection mold, and injection molding material is injected into the cavity. After the molded article is removed from the mold, the base film is peeled off and the ink layer is transferred to the surface of the molded article. The injection mold has a coring pin for forming an opening in the molded article and the contact surface of the coring pin to be brought into contact with the adhesive layer of the transfer film has poor adhesion to the adhesive layer so that the bond strength between the contact surface of the coring pin and the adhesive layer is lower than those between the ink layer and the releasant layer and between the releasant layer and the base film.

Abstract: An injection mold assembly for formation of thin walled multi-partitioned plastic containers. An array of cantileveredly mounted and spaced apart cores are extendable into a female mold assembly which includes a pair of side cavity cams and end cavity cams closeable upon the array, but spaced therefrom to form the plastic container therebetween. A plurality of side locking wedge shaped fingers are extendable into the slots spacing the cores apart. The fingers are arranged to extend into the opposite sides of the array of cores in a direction perpendicular to the longitudinal axis of the array spacing the cores apart while plastic is injected into the assembly by injectors mounted to the female mold. A pair of end pushers contact the two outermost cores in the array limiting outward movement of the cores during the injection step. The end pushers likewise extend in a direction perpendicular to the longitudinal axis of the array.

Abstract: The invention is a flexible mask for use in charging a flowable material into selected cells of a honeycomb structure and is of particular utility in charging a sealing material into the ends of selected cells of such a structure during fabrication of solid particulate filter bodies and other selectively plugged honeycomb structures. The mask has a central body with a set of openings extending therethrough which allow passage of the flowable material through to the selected cells and a second set of protrusions extending from one of the surfaces of the mask which are used to align the mask to the end face of the structure and which extend into and sealably cover the cells which are not to receive the flowable material. The mask may be formed from a polymer, preferably an elastomer, using any of three disclosed die apparatuses.

Abstract: An apparatus for molding three concentric plastic materials into a composite body in which the mold includes a pair of molding blocks having reduced ends which define an inner cylindrical cavity into which a first material may be injected, a pair of tubular molding sleeves surrounding the molding blocks and axially movable relative thereto which define an intermediate cavity therebetween into which a second material may be selectively injected to form a second intermediate concentric portion of a composite body and a fixed molding cavity with which the inner and intermediate molding cavities are selectively aligned so that a third material may be selectively injected to form an outer concentric portion of the composite body.

Abstract: An elastomeric-covered shrouded impeller having a pair of disk-like shrouds enclosing vanes and vane passages which has an improved throat opening having sweeping internal sidewalls is disclosed. A three-piece mold core is utilized to form the vane passage and the sweeping curved throat inlet of the impeller.

Abstract: A gang form in which a single or a plurality of precast concrete beams will be molded at one time, the gang form comprising a first and two second vertical walls, the first wall being a straight wall, the two second walls spaced apart one from another extend transversely away from the first wall while having an end abutting the first wall, a tier or tiers of precast concrete beams being molded by placing fluid concrete into a mold compartment comprising the top surface of either a starter slab or a previously precast beam, a longitudinal segmental strip of a vertical surface of the first wall or the vertical surface of a previously constructed tier and an individual mold side member, which side member is restrained by restraint means placed exterior of said mold compartment, the restraint means allowing the individual mold side member to be adjusted vertically while also being adjusted horizontally at various distances apart from a face of the first wall, the precast concrete beams while molded in their mold

Abstract: A reinforced fiberboard box for creating a void in and under concrete formations. A single piece of double faced, corrugated fiberboard is defined by a face, a bottom, a pair of end flaps, and a pair of side flaps. The end flaps are folded into at least four uniformly shaped partitions which are subsequently folded onto the face of the fiberboard and are aligned along the longitudinal axis to create a box-like structure. Pairs of side flaps are then wrapped around the sides and top of the partitions to form a completely closed, internally reinforced, box-like structure. A portion of the side flaps are tucked inwardly, intersecting the partitions so that slots in the side flaps interlock with slots in the partitions which prevents the box void from unfolding during use.