Abstract: A method and apparatus for fabricating a microporous-membrane for gel plate separating and transferring macromolecules by electrophoresis, the apparatus comprising a peripheral frame (10) provided with a removable bottom plate and including means (54, 58, 60, 64) enabling the membrane to be tensioned after it has been placed on the liquid gel as cast onto the bottom plate.

Abstract: A system and process for fabricating pressboard from shredded paper coated with a thermoplastic material and a pair of facing webs includes placing the shredded poly-coated paper between the two traveling webs to form a composite, the composite then being passed in a manner to heat the thermoplastic material above its softening point to differentially repeatedly shift the traveling webs linearly relative to each other and to the shredded paper for enhanced bonding of the shreds to themselves and to the facing webs by passing them around a series of heated rollers defining a serpentine path, and then pressing the composite together while curing to bond the components, and cooling the product.

Abstract: A magnetic circuit component molding device for integrally molding a compound a center yoke with a ring-shaped magnet includes top and bottom press vertically arranged at opposed positions. A ring-shaped magnet is place on a bottom die between top and bottom press. The top and bottom press compress the compound against the ring-shaped magnet ring with a vertical pressure. A holder unit, separated in plural segments, having tapered outer circumferences is provided around the ring-shaped. A holder presser having a tapered inner circumference is mounted on the holder unit as tapered portions thereof are engaged together. A portion of the vertical pressure, when the top press compresses the compound, is transferred by springs 10 to the holder presser, and is amplified by the tapered portions and applied to the outer circumference surface of the ring-shaped magnet by the holder unit.

Abstract: Apparatus for making a reinforced thermoplastic composite is disclosed. The apparatus is designed for making such composite from a dry blend of expanded thermoplastic pieces and filler particles of ambient temperature. The thermoplastic composite includes a quantity of expanded thermoplastic pieces and a quantity of filler particles suspended by the pieces, with the quantity being up to 60% by weight of the blend. The apparatus includes a first elongate compartment defining a low-pressure compression chamber, and a feeder for sequentially transferring the blend to the first compartment in preselected amounts. A second elongate compartment defines a high-pressure compression chamber with open ends and an entry section structured with a port. The second compartment is positioned adjacent the first compartment so that the chambers are in communication with each other via the port.

Abstract: The apparatus includes a heatable casting bed, a device for tensioning a reinforcement member at the casting bed, a finishing machine movable along the casting bed for casting a component, a cutter for cutting the reinforcement member, a plurality of roller trucks arranged like a train and of increasing height for wedge-like penetration between the component and the casting bed, a slider roller bed at a rear end of the plurality of roller trucks having a length equal to the casting bed length, an actuation device for generating relative motion between the roller trucks, sliding roller bed and casting bed, in order to transfer the component from the casting bed to the sliding roller bed, and a cutting station for cutting the component into segments.

Abstract: A method for hooping and maintaining in compression a core by a sheath, with the sheath being made of a composite material and having an internal cross section which is less than an external cross section of the core. The core and the sheath are aligned by centering them with respect to each other, and a prior tensile force is exerted over the core to provide a suitable sealing between the portion in contact of each of the ends of the core and of the sheath. A pressurized fluid is injected into the sheath in a direction of the core, to increase the cross section of the sheath by expanding the sheath in a circumferential direction. The core is thereby gradually inserted into the sheath. When the insertion is complete, fluid injection is ceased and an expendable portion of the sheath is cut off.

Abstract: Apparatus for manufacturing a press jacket from pourable elastomeric material with reinforcement threads. A cylindrical pouring body. A longitudinal thread tensioning device at the pouring body. A feed device for feeding circumferential threads to the pouring body. A pouring nozzle for pouring the elastomeric material to the pouring body. A spacing device maintains a constant distance between the longitudinal threads and the jacket surface of the pouring body as well as a constant circumferential distance between adjacent longitudinal threads. The spacing device includes a plurality of segments. Each segment has an L-shaped cross section. The radial arm has slots for the passage of longitudinal threads and furthermore teeth present between the slots. A slide is rigidly fastened to the support and includes rollers which engage the segments and move the spacing device along the pouring body.

Abstract: The invention relates to a prestressed concrete slab and a method for preparing the slab. The slab comprises a corner post at each of its corners. The corner post comprises a cylindrical member; means of attaching and securing reinforcing members to the corner posts; means of attaching each slab to another slab; and means of tensioning the reinforcing members. The slab further includes a center post. The center post comprises a cylindrical member and means of attaching and securing reinforcing members to the center post. Reinforcing members are attached to the corner post and the center posts to connect each to the other. Concrete is set and cured between the corner posts and around the center post and the reinforcing members to form a slab.

Abstract: A stripping station which is used for stripping a mold from a cast concrete lamp pole has a mold that has an axial compressive load placed thereon by a tension force applied to tension members running through the mold. The tension members are secured to anchors located at one end of the mold. A stripping fixture attached to the anchors exerts a tension force sufficient to relieve the axial compressive load on the mold and transfers the axial load to the frame of the stripping machine. This allows the mold to be removed. The axial compression load is transferred to the pole after the mold is stripped.

Abstract: A process and an apparatus to make composite insulators, consisting of a central core (3) provided with an insulating coating (4) of elastomeric material, for electric overhead lines. The apparatus comprises a base structure (6) to which a first and a second end pieces (5a, 5b) of the core (3) are respectively fastened by a bracket (7a), and two injection mould halves (8a) designed to be moved close to each other. Mounted to the base structure (6) are at least two forming mould halves (9a, 9b) arranged to define a filling housing (9c) around the core (3). An injection nozzle (11) communicates with a conveying hollow space (12) coaxial with the central core (3), which is formed between the injection mould halves (8a) and a containing sleeve (13) mounted on the second end piece (5b).

Abstract: A conveyor belt has edges with longitudinally extending profiles formed as grooves or elevations for sealing and guiding. An apparatus for producing belts with profiled edges uses a cutting device and profiled molds to form profiles in the belt and its edge while the belt is guided and supported by rolls. The apparatus further includes a cutter which forms a groove in the conveyor belt and which allows lateral guiding of the bolt in relation to the mold.

Abstract: An apparatus for producing a longitudinal multi-component frame element includes a longitudinal mold within which is positioning at least one longitudinal member to form a first component of the frame element. A second component of the frame element is formed by introducing into the mold a foamable and curable material such as polyurethane which cures to form a rigid plastic component connected to the longitudinal member. Before formation of the rigid plastic component, the longitudinal mold is bent in a direction opposite to a direction of anticipated warping of the frame element that would be caused by internal stresses therein. Thus, the frame element initially is formed within the mold to be of a bent configuration, and after removal of the frame element from the mold, the internal stresses transform such initial bent configuration into a straight or rectilinear configuration.

Abstract: An adjustable sealing system for use in a molding apparatus is disclosed. The molding apparatus is used for applying a coating of polymeric material to the surface of a shell. The molding apparatus includes a molding surface and a seal groove adapted for retaining a seal. The molding apparatus is capable of receiving a shell and forming a molding cavity between a surface of a shell and the molding surface. The seal establishes sealed contact between the shell and the molding surface when the molding apparatus is closed. The adjustable sealing system includes a seal for insertion and retention in a seal groove of the molding apparatus, so that a portion of the seal extends from the seal groove to a selected height when the molding apparatus is open. A seal height adjustment means is disposed under the seal in the seal groove. The seal height adjustment means is capable of adjusting the height of the seal above the seal groove to correspond to a particular contour of a shell being molded.

Abstract: A prestressed concrete beam is made by first fitting the opposite ends of a group of reinforcing rods through respective holes in a pair of longitudinally spaced end plates having longitudinally confronting inner faces and opposite outer faces, then providing on each of the rods a head bearing longitudinally inward on the respective outer face, and then applying opposite outward traction to the end plates to tension the rods and filling around the rods and between the inner faces of the plates with a mass of concrete. The concrete mass is then cured and the traction on the end plates is released. Subsequently the heads of the rods are released from the plates and the plates are removed from the ends of the mass of cured concrete. The heads can be machined or burnt off, or the plate can be constructed to release them.

Abstract: This invention relates to an injection moulding process for the manufacture of multi-layered articles, especially articles having barrier properties. The process includes clamping a thermoplastic film over the cavity of a mould of an injection moulding process, the film being capable of being stretched. The film is then stretched within the mould by inserting the core of the mould, preferably using a core in which a central part enters the mould and partially stretches the film prior to the remainder of the core entering the mould. The mould is then closed, excess film is trimmed off and polymer is injected into the mould cavity. The resultant article is a multi-layered injection moulded article which, depending on the characteristics of the film and injected polymer, may have barrier properties to oxygen, liquids or the like that are superior to articles moulded from only the polymer. The process is particularly useful in the moulding of containers having a depth:width ratio of at least 0.5.

Abstract: A skin or shell is disclosed for use in a mold process in which the skin or shell is placed in a mold in which foam precursors are directed onto the skin for reaction thereagainst to form a foam layer thereon; the skin includes integral connector features thereon adapted to be connected to the mold for stabilizing the location of the skin within the mold so as to prevent wrinkling of the skin during the mold process.

Abstract: An installation for the fabrication of a series of cells constituting a single construction unit such as a dwelling house or a building story includes a fabrication bed which carries members for subdividing a single placement of concrete into serveral distinct slabs each forming part of one cell. These subdividing members are removably fixed on the fabrication bed in various positions according to the intended width of the cells. The subdividing members carry a device for temporarily immobilizing the two prefabricated panels placed on each side, each device being constituted by a post, the lower end of which can be fixed in an adjustable position on the corresponding subdividing member, and by an external shore of adjustable length.

Abstract: A device for producing pellets from film. A cradle is rotatably mounted about a longitudinal axis of rotation to a main frame. An axle arranged perpendicular to the longitudinal axis holds one or more rolls of film. A plurality of drive rollers pull the film from the rolls while the rolls are rotated on the longitudinal axis twisting the film into a strand. An oven located between the rolls and drive rollers heats the strand to permanently set the twist thereon. A pelletizer located aft of the drive rollers cuts the strand into individual pellets. In a modified version, glass roving is extended through the holder past the roll and wrapped with the film into a single strand. In an alternate embodiment, the roll of film is mounted to an axle having a longitudinal axis extending in the same direction as the axis of rotation. The film is pulled axially off the roll and twisted into a strand.

Abstract: An apparatus for making concrete pipe having vinyl liners. An expandable core is used to hold a tubular vinyl liner. The core has over-center latches which lock the core in an expanded position to hold the liner against the outside surface of the core. The core is a flexible and expandable shell which can be deformed by a forming module into an exact desired shape prior to placing concrete arount the liner and the core. The liner and core are inserted along with a reinforcing cage into a dry-cast concrete form. Then the form is placed over the module and the module is actuated into engagement with the inside surface of the core. The module has a series of disc assemblies, each of which has a plurality of radially moveable shoes capable of being moved to expanded and retracted positions. The form is filled and immediately taken off the module.

Abstract: In casings for switch cross ties, the bottom plate 3 serves at the same time as a pattern for the position of the construction components. As a rule, a new casing is prepared for each series of cross-ties type. In small series with various positions of the construction components it is economical to use the bottom plate repeatedly. This is done by providing the bottom plate, prior to its insertion in the casing, with holes (A,B,C) for several types of finished parts, by provisionally closing the unnecessary holes by suitable means and by finding the combination of holes required for the production of a certain type of finished part through a certain searching procedure and freeing them of their provisional closing means.

Abstract: In an optical-disk manufacturing device in which a disklike plate is coated with an ultraviolet-set resin on one side thereof, pressed against a stamper, and irradiated by ultraviolet rays to transfer a pattern provided in the stamper to the ultraviolet-set resin, the optical-disk manufacturing device has a disklike-plate supplying section which can store a plurality of disklike plates; a resin supplying section for supplying the resin to the disklike plate; a transfer section for transferring the pattern of the stamper to the resin; a disklike-plate removing section for removing the disklike plate after transferring; and a transport device to transport the disklike plate from each proceding part to each following part.

Abstract: In an optical-disk manufacturing device in which a disklike plate is coated with an ultraviolet-set resin at one side thereof, pressed against a stamper, and irradiated by ultraviolet rays to transfer a pattern provided in the stamper to the ultraviolet-set resin, the optical-disk manufacturing device has a disklike-plate supplying section which can store a plurality of disklike plates; a resin supplying section for supplying the resin to the disklike plate; a transfer section for transferring the pattern of the stamper to the resin; a disklike-plate removing section for removing the disklike plate after transferring; and a transport device to transport the disklike plate from each proceding part to each following part.

Abstract: A winding device having a rotational axis and two side walls arranged perpendicular to the rotational axis. Each side wall is provided with two slits extending from the middle portion to both extreme ends of the side wall. A supply of bolts is arranged to the winding device whereby the bolts have a smaller diameter than the width of the slits and a greater length than the distance between the two side walls.

Abstract: In an optical-disk manufacturing device in which a disklike plate is coated with an ultraviolet-set resin on one side thereof, pressed against a stamper, and irradiated by ultraviolet rays to transfer a pattern provided in the stamper to the ultraviolet-set resin, the optical-disk manufacturing device has a disklike-plate supplying section which can store a plurality of disklike plates; a resin supplying section for supplying the resin to the disklike plate; a transfer section for transferring the pattern of the stamper to the resin; a disklike-plate removing section for removing the disklike plate after transferring; and a transport device to transport the disklike plate from each proceding part to each following part.

Abstract: The intermediate anchor includes an abutment body for an end of an anchoring element mounted on an end of a pretensioning element, the abutment body is supportable on an inner side of a wall of the centrifugal concrete mold and mountable on the inner wall. At least one anchor bolt extendable through the wall of the centrifugal concrete mold in a sealed manner mounts the abutment body. The abutment body has a conical recess extending transversely to the anchor bolt for receiving the anchoring element of the pretensioning element. A wedge-shaped projecting piece is releasably mounted on the abutment body and engages the tensioning element in a fork-shaped manner near the anchoring element. The projecting piece is releasable after removal of the pretensioned concrete body from the centrifugal concrete mold and before removal of the abutment body from the concrete body so as to release a portion of the pretensioning element near the anchoring element for separating by a separating device.

Abstract: A mold for manufacturing a skin covered foamed plastic article, with which it is possible to place the skin cover at a desired position, without spoiling or damaging the skin cover, such that the skin covered foamed plastic article of a desired shape without any deficiencies such as wrinkles and dents can easily be manufactured. The mold includes an upper mold; and a lower mold, to be assembled with the upper mold in order to form a cavity in which a liquid foam resin undergoes foaming process to become the pad member, over which a skin cover is to be placed, the lower mold including at least one windows at which the skin cover can be pushed outward by pressure of the liquid foam resin.

Abstract: A process and apparatus for the production of bristle articles include introducing the plastic bristles in the form of individual bristles or bristle strands through channels and sleeves extending the latter in to a mould for the bristle carrier, followed by thermal melting on their end located on the mould for formation of a thickened portion and the thickened portion on the bristle ends formed during melting is then sealingly engaged on the opening of the sleeve projecting into the mould. During the filling of the mould, the bristles and sleeve are kept in position within the same and the sleeve and the thickened portion on the bristle end tightly engaging against the opening of the sleeve are enveloped by the bristle carrier material during mould filling and then the sleeve is removed from the bristle carrier.

Abstract: A method for making concrete pipe. Vinyl liners are held by an expandable liner carrying device. The carrying device is expanded so as to hold the liner in engagement with the outer surface, forming a liner/carrier assembly. Concrete reinforcing bars are placed around the liner/carrier assembly. The liner/carrier assembly and reinforcing bars are surrounded by a dry-cast concrete form. Then, the form is placed on a forming module, and the module is actuated into engagement with the inside surface of the core forcing the liner/carrier assembly to assume a predetermined, usually cylindrical, shape. The form is filled and immediately taken off of the module. The form is immediately stripped, but the core, held immobile by the dry cast concrete, which sets quickly, continues to hold the liner in engagement with the concrete until a complete bond is established. Finally, the core is retracted from engagement with the liner and removed from the finished lined pipe.

Abstract: A method and a device for introducing reinforcing strands into a vertical mold through the open upper end thereof. An array of strand material is positioned to extend across the open end of a mold and an insertion device is lowered into the mold. The insertion device engages the strand material during its downward motion and draws an appropriate amount of such material from a continuous supply thereof to give a strand reinforcement of elongate U-shape within the mold. A reciprocable carriage is provided whereby the leading end of the strand is presented to a clamp at a remote side of the mold opening, the carriage having a selectively operable clamp thereon for engagement with the strand during movement of the carriage toward the clamp.

Abstract: Disclosed herein is an apparatus for manufacturing an optical substrate which has a transfer layer corresponding to an optical pattern by supplying a liquid radiation-setting resin between a stamper carrying the optical pattern and the substrate and by setting the radiation-setting resin. The apparatus includes a turnable, a center boss, gas pressure control mean, and a defoaming means including an outer circumferential means to defoam the radiation-setting resin. The turnable, the center boss and the gas pressure control means are united into a carriage base which is movable on the casing of the apparatus.

Abstract: Apparatus for stabilizing the location of a skin or shell in a mold for foaming a part includes magnets on the mold adapted to be releasably interconnected to a shell retention and draw bar. The draw bar connects to an integral shell connector. The draw bar is adjustable to pull the shell with respect to the magnets for removing wrinkles from the shell prior to foaming the part.

Abstract: The present invention relates to an apparatus for the production of back-foamed products. The apparatus broadly consists of two mold halves, a stretching frame attached to one of the mold halves, and a pulsator device for applying pulsations to the edge region of the mold cavity.

Abstract: A plant to manufacture elongated concrete elements, particularly railway sleepers of prestressed reinforced concrete. In the plant according to the invention, the forms for the production of said elements are supported on carriages sliding along parallel side-by-side tracks, and the operating machines designed to perform in succession a series of operations on said forms are positioned into a limited working area, housed inside a shed, and are mounted above said tracks, substantially fixed in respect of the longitudinal axis of the tracks but movable transversely thereto. The curing area for the concrete elements is arranged externally to the working area. In the case of prestressed reinforced concrete elements, the tensioning device for the reinforcement strands are mounted directly on each of said slidable carriages supporting the forms.

Abstract: An apparatus for setting up a concrete form for the subsequent forming of a concrete member therein. The apparatus for setting up the concrete form includes a deck brush for cleaning the deck portions of an elongated concrete form, stem brushes for cleaning the stem portions of the concrete form, nozzles for spraying pressurized lubrication fluid onto the form, strand pulling and placing devices for placing reinforcing strands in the stem portions of the concrete form, rams for depressing the strands down into the stem portions after tensioning thereof, and a deck reinforcing material dispensing system which simultaneously straightens and dispenses deck wire onto the deck portion of the concrete form.

Abstract: An apparatus for sealing around an insert in a molded part to avoid the escape of flash including a mold cavity cooperatively defined by at least two mold blocks, at least one of the mold blocks having at least one insert opening communicating with the cavity. A plunger chamber is substantially co-axial to the insert opening and communicates with the cavity via the insert opening, the plunger chamber having generally greater radial dimensions than the insert opening, thereby defining a generally inwardly-directed flange with respect to the walls of the plunger chamber. The surface of the flange remote from the cavity constitutes a seating surface within the insert opening. A resilient seal is fitted within the plunger chamber against the seating surface in proximity to the insert. A plunger is positioned within the plunger chamber for relative movement generally towards and away from the cavity to compress the resilient seal against the seating surface.

Abstract: An optical fiber (21) which has been drawn from a preform (22) is moved into and through a chamber (38) of a housing. A source of vacuum is connected to the chamber to prevent the attachment of air pockets to the optical fiber as it is being moved through the chamber and through an opening of a die. The die includes a flow path (55) which is substantially normal to the path of travel of the optical fiber and the die opening is substantially larger than the diameter of the optical fiber. The thickness of the flow path in a direction along the path of travel is sufficiently small so as to prevent the recirculation of the coating material in the vicinity of the point of application to the optical fiber. Also, the fiber draw rate, the pressure of the coating material the direction of the flow path relative to the longitudinal axis of the optical fiber and the diameter of the die opening are such that a gap forms between the coating material and the die.

Abstract: Prestressed concrete railroad ties are formed in molds which are supported by existing track near the area where they are to be installed. Each mold will form a number of ties. Reinforcing strands are located within a plurality of longitudinally spaced molds. Concrete is then poured into the molds and the ties are formed bottoms up in the molds. A group of ties are simultaneously removed from a given mold by a special extractor which first simultaneously clamps the reinforcing strands extending outwardly from a given mold, and then lifts the strands as a group from the mold by a suitable crane. Preferably the center of gravity of ties is spaced from a pivot point which will cause 180.degree. rotation locating the ties in upright position to be loaded on a railway car or other vehicle to take them to the site where they are to be installed.

Abstract: The apparatus includes a first female mold member defining a shaped mold cavity for receiving a plastisol layer or skin. A second mold member is pivotally disposed on the female mold member between an open and closed position. In the open position, the second mold member receives and holds thereon a portion of the plastisol skin extending from the mold cavity. An insert is positioned in the mold cavity by a third mold member such as a mold lid on which the insert is releasably retained. After the insert is positioned in the mold cavity, the second mold member is pivoted toward the mold lid to fold the skin portion thereon over and against an edge of the insert. The skin is folded adjacent the pivot axis of the second mold member. Foam can then be introduced and cured between the skin and insert.

Abstract: Prestressed concrete railroad ties are formed in molds which are supported by existing track near the area where they are to be installed. Each mold will form a number of ties. Reinforcing strands are located within a plurality of longitudinally spaced molds. Concrete is then poured into the molds and the ties are formed bottoms up in the molds. A group of ties are simultaneously removed from a given mold by a special extractor which first simultaneously clamps the reinforcing strands extending outwardly from a given mold, and then lifts the strands as a group from the mold by a suitable crane. Preferably the center of gravity of ties is spaced from a pivot point which will cause 180.degree. rotation locating the ties in upright position to be loaded on a railway car or other vehicle to take them to the site where they are to be installed.

Abstract: Prestressed concrete railroad ties are formed in molds which are supported by existing track near the area where they are to be installed. Each mold will form a number of ties. Reinforcement strands are located within a plurality of longitudinally spaced molds. Concrete is then poured into the molds and the ties are formed bottoms up in the molds. A group of ties are simulatenously removed from a given mold by a special extractor which first simultaneously clamps the reinforcing strands extending outwardly from a given mold, and then lifts the strands as a group from the mold by a suitable crane. Preferably the center of gravity of ties is spaced from a pivot point which will cause 180.degree. rotation locating the ties in upright position to be loaded on a railway car or other vehicle to take them to the site where they are to be installed.

Abstract: A process for making beams of prestressed concrete in an assembly for casting and curing beams of prestressed reinforced concrete, having an individual prestress frame allowing tensioning of longitudinal reinforcements between two fixed end elements maintained in spaced-apart relationship by longitudinal elements; and an individual impression cooperating hermetically with the frame so that the walls of the impression and the walls of the end elements of the frame, connected together, form the sides of a mould receiving the cast concrete, the impression being adapted to be separated from the frame without detensioning of the reinforcements.

Abstract: An installation for manufacturing reinforced concrete elements, in particular prestressed concrete slabs or pre-slabs, by means of a bench including a manufacturing area of predetermined shape, together with a molding apparatus. Memory means (46) are provided for storing building data relating to the elements to be manufactured and concerning at least the geometry thereof, together with tracing means (48) for marking on the manufacturing area (16) the locations of at least some of the walls placed thereon and constituting portions of the molding apparatus.

Abstract: A method of and a casting bed for producing a concrete product, especially an endless concrete blank prestressed in at least two directions. In order to enable a prestressing wire to be arranged in position and tightened in a simpler manner, at least one prestressing wire is passed in a zigzag-like manner crosswise between at least two fixed sides of a casting bed to form a wire net and the wire net is tightened from a third side of the casting bed in the direction of both first-mentioned sides so that the wire net is stretched in two directions by means of a traction in one direction. Finally, concrete is fed on the bed to form a prestressed concrete blank. An apparatus intended for carrying out the method comprises a weaving device for stretching the prestressing wires continuously and in a zigzag-like manner crosswise between two parallel sides of the casting bed and for tightening of the wires in the longitudinal direction of the casting bed.

Abstract: Injection molding a tread on an annular tire casing (44) positioned in a mold (10') by introducing a fluid molding compound (76',78') at high pressures and high temperatures into a tread molding space (105) through runner passages (114) extending from an edge (116) to a centerplane (20'--20') of the mold (10') and having gates (118) opening into the tread molding space (105). Alternatively the runner passages (56,58) may be defined by annular runner surfaces (60,62,64,66) in communication with the tread molding space (48) through annular gates (52,54). The fluid molding compound (76,78) may be ejected from annular transfer recesses (68,70) in the mold (10) by squeeze rings (84,86) movable into the transfer recesses (68,70) to introduce the fluid molding compound (76,78) into the runner passages (56,58).

Abstract: Method and apparatus for producing sealing strips and similar profiled strips of rubber and rubber-like elastomers. Rubber-like profiled sealing strips for window or door openings are frequently provided with overlay strips to facilitate installation, to enhance the relative movements, or for aesthetic-visual reasons. The material of these overlay strips generally differs considerably from the material of the base main strip. The manufacture of such two-material profiles can be undertaken in a single extrusion step by joining and directly combining a prefabricated overlay strip with the main strip in the extrusion head of an extrusion press, where the shape is provided for the profiled strip. By stretching the overlay strip, the adhesion of the latter to the main strip is significantly improved.

Abstract: Process and apparatus for forming a core for optical fiber cables, the core having a central reinforcing element surrounded and contacted by a layer of plastic having helical grooves at its surface. The helical grooves are formed by passing the reinforcing element through a plastic extruder having a groove forming die and while the plastic is being applied at the extruder, the element is alternatley rotated in opposite directions in advance of its entry into the extruder. The reinforcing element may be rotated by a pair of driven belts which frictionally engage the element and which are mounted on rotatable rings driven by an alternating rotation motor drive or may be rotated by a pulley which frictionally engages the element and which is carried by a support rotatable around the longitudinal axis of the element by an alternating rotation motor drive.

Abstract: An improved apparatus and method is disclosed for use in a system for growing a hollow tubular body of crystalline material by growing the body from the end of a die member, whereby the hollow tubular body can be cut lengthwise along predetermined lines of the body to provide separate crystalline bodies. The apparatus comprises means (preferably in the form of notches provided in the die end of the die member from which the hollow body is grown) for concentrating stress in the hollow tubular body along the predetermined lines as the body is pulled from the die end. The method comprises the steps of (a) growing the tube from a die end of a die member so that stress is concentrated in the tube along predetermined lines as the tube is grown; and (b) cutting the tube along the predetermined lines so as to separate the hollow tube into the plurality of bodies of the crystalline material.

Abstract: Proposed is a method for the erection of structures, such as bridges, that display pre-fabricated concrete beams, according to which the individual pre-fabricated beams are produced, on the spot, on a feed rigging within the corresponding work area of the structure, in a heated and laterally tiltable form. After removal from the form, the thusly produced pre-fabricated beams are transferred sidewardly into their final position by means of gantry cranes. During concretizing of the individual pre-fabricated beams, flexure of the feed rigging carrying the form is equalized in continuous fashion, in correspondence with the progressing, concretizing process, by transfer pumping of ballast liquid.

Abstract: A portable system for making harped, reinforced concrete beams includes a series of inverted T-shaped concrete bed sections, with aligned longitudinally extending holes for receiving tensioning cables to hold the sections together, to provide two beds, one on either side of the center wall of the sections, to make the concrete beams. At points near the center of each beam to be formed, arrangements for "harping" or depressing the longitudinally extending tensioning steel strands or cables are provided.

Abstract: A method of manufacturing an optical fiber cable involves embedding a traction-resistant axial strength member of at least one wire of precipitation hardened martensitic steel in a rod of thermoplastic material extruded thereabout while forming longitudinal grooves or cavities in the periphery while subjecting the rod and the strength member to an initial axial traction stress, extending them by less than their elastic limits, disposing optical fibers in the grooves or cavities of the rod while still under axial traction stress, and removing the axial traction stress. An extrusion machine has a head terminating in an axial outlet. A fixed member extends around a rotary die supporting the die on bearings internally of the fixed member. The fixed member is fixed to the front face of the extrusion machine and supports a die inlet axially spaced from the front face and the head outlet to ensure that a small controlled amount of plastic material leaks radially at the gap to the exterior.