Abstract: Manufacturing lined concrete pipe in a reduced time, and provision of such pipe with reduced tendencies to rusting and liner separation, are achieved by a cartridge assembly (22) movable to and away from the pipe machine, a work stand assembly (23) for positioning the cartridge to receive a liner, liner tensioning structures (68) and liner to cartridge clamps (87) for moving the liner to the cartridge, tightening the liner, and holding the liner during transport by the cartridge, and tension bars (96) controlling wire tension during pipe formation. Concurrently with operation of the standard pipe machine, the work stand operates to place a liner on the cartridge. During the stripping cycle of the pipe machine, the cartridge delivers the liner to the core. During the pipe machine vibration under pressure cycle, the tension on the liner tension wires is relieved.

Abstract: A container mold comprising a mold cavity portion and a mold core portion with the cavity and core portions being relatively moveable between a closed and an open position. By this invention, means are provided for molding a recess-defining flange in the container.

Abstract: A concrete ramp is, in cross section, in the form of an inverted U and is made in sections. The form includes a base the upper surfaces of which are inclined relative to the horizontal at an angle wanted for tread surface of the ramp. A pair of inner and outer side walls are provided for each side of the base and then are shaped and dimensioned so that their upper edges are horizontal, the height of the inner walls less than that of the outer walls. The walls of each pair are hingedly connected to the base in a manner enabling the outer walls to swing outwardly and the inner walls to swing inwardly. Power operated devices supported by the base are operable to hold the inner walls vertically or to pull them inwardly. A plate is supported by the inner walls in a manner permitting it to be lowered or raised as the inner walls are swung into or out of their operative position.

Abstract: An open container includes an outer part formed of molded polyurethane and an inner liner of preformed plastic material, the polyurethane being placed in an open mold cavity and a center core plug having a plastic liner disposed thereabout is inserted into the open mold cavity to occupy a predetermined positional relationship therewith so that when the polyurethane is allowed to foam, rise, set and cure, the liner is securely bonded thereto to form a mechanically strong heat insulated container for displaying consumer items such as soft drinks immersed in ice water disposed within the container.

Abstract: A packaging system for encapsulating an article within a solid foam material. An article to be encapsulated is supported on a base. A wall enclosure is disposed on the base to form a mold cavity. At the top of the base and above the article to be encapsulated is a cover. Expandable plastic foam in liquid form is introduced into an orifice of the base and the expandable plastic foam advances through a passageway in the base and is discharged from an orifice in the base into the mold cavity to encapsulate the article. The foam material in liquid form solidifies into a solid plastic foam material for packaging the article.

Abstract: An injection mold for the manufacture of sealing elements consisting of elastic material and having undercuts, particularly sealing bellows for joints, for example ball joints in automotive vehicles, includes followers which are divided centrally in the longitudinal direction of the sealing element and form the outer contour. The mold has a core plunger which forms the inner contour and is divided into an upper core plunger part and a lower core plunger part which are movable relative to each other. The sealing element is removed from the foregoing parts after the opening of the followers. In order to be able to remove the sealing element automatically form the mold without the use of parting agent the followers are split in transverse direction into an upper and a lower pair of followers in the region between the inner undercut of smallest diameter and the outer undercut of smallest diameter.

Abstract: For the molding of bottle caps having irregular lower boundaries, such as caps having depending tabs, the conventional mold has a core and a surrounding sleeve in which the core slides. This is modified by using a split sleeve which is maintained in close contact with the core during molding, but whose elements are freed to move outwardly away from the core when the mold begins to open. This solves the prior art problem of the galling of the contacting surfaces of sleeve and core.

Abstract: A mold defining a mold cavity for manufacture of an article, the mold comprising a plurality of mold side wall members, each of the side wall members including opposite end portions and including an inwardly facing surface comprising a mold surface for forming at least a portion of a side wall of the molded article. The side wall members are moveable from a closed position wherein the side wall members cooperate with said first and second end wall members to define a mold cavity conforming to at least a portion of the desired exterior dimensions of the article, and an open position in which each of the side wall members is displaced laterally outwardly of its closed position and away from the end wall members to a location in spaced relation from the end wall members.

Abstract: In order to mold tamperproof bottle closures or other plastic articles having a threaded cap frangibly connected with an adjoining skirt which has a number of internal projections or spurs inclined in a transverse plane at approximately identical acute angles to its inner peripheral surface, a male mold portion has a core in the form of a stepped cylinder with a small-diameter part rotatably enveloped by a sleeve flush with an adjoining large-diameter part jointly defining an annular gap with a surrounding shell. The sleeve has recesses in the shape of undercut slots forming the internal projections of a skirt molded in that gap; after sufficient hardening, the shell is rotated to extract these projections from their recesses with resulting radial expansion of the skirt into an adjoining space from which the shell has been axially withdrawn.

Abstract: Improved mold structure and method of molding for mechanically frothed urethane foams is presented. The mold is filled from the bottom via an annular runner which communicates with the mold cavity. The connection between the annular runner and the mold cavity is restricted to create a back pressure in the circumferential runner.

Abstract: A tripartite mold has a control bar on a fist outer plate and a locking bar parallel thereto on a second outer plate, both of them traversing respective passages in a guide block on an intermediate plate when the mold is closed. A U-shaped detent, slidable transversely to the two bars in a channel of the guide block, straddles the locking bar with clearance and is urged by spring pressure against the control bar which, in the closed position, it contacts with one leg while its other leg engages in a notch on the locking bar so as to latch the intermediate plate to the second outer plate. When the outer plates are driven apart with initial entrainment of the intermediate plate by the second outer plate, a cam on the control bar represses the detent against its spring force and disengages the other leg thereof from the locking bar whereby further separation of the outer plates lets the intermediate plate stay put while the second outer plate moves away.

Abstract: A bucket shaped container having a rim opening smaller than the diameter of the sidewall thereof is injection molded from thermoplastic material using a die set including a molding core which collapses to allow axial removal of the molded container from the mold. The molding core comprises a plurality of individual, wedge shaped outer core sections which collectively form a continuous molding surface and are slidably mounted on a tapered inner core to allow axial sliding movement of the outer core sections relative to the inner core. Each of the outer core sections is also mounted for radial sliding movement on a mounting plate which circumscribes the molding core and is mounted for reciprocating axial movement relative to the inner core. Reciprocation of the mounting plate produces simultaneous axial and radial movement of the outer core sections throughout their entire lengths between an expanded molding position and a collapsed container releasing position.

Abstract: This is a molding apparatus designed to mold a plastic tub of circular transverse cross-section and re-entrant shape. Specifically, the tub tapers from its closed bottom to its opened top. The mold core is, therefore, collapsed radially to permit extraction of the plastic tub from the mold. This radial collapse is accomplished by forming the mold core of a central segment and a plurality of peripheral segments, and then axially extending the central segment while moving the peripheral segments along a radially inward path so that core collapse occurs. The exterior shape of the peripheral core segments defines a circular cross-sectional shape for the interior of the tub, despite the fact that the central core segment has the configuration of a hexagonal pyramid. Side mold segments which move radially outwardly and a tub extraction ram complete the equipment for extracting the tub from the mold.

Abstract: In a metal mold for molding a hollow product having inwardly tapered side wall with a stationary die plate for forming a bottom portion of the product, a core, and a cavity plate surrounding the core, the core has a truncated pyramid shape and first and second slide cores are provided between the core and the cavity plate. The core and slide cores are constructed such that at the time of opening the mold both slide cores are moved inwardly in an interlocked relation with retractive movement of the core thus leaving one end of the molded product for enabling removal thereof.

Abstract: Thermally collapsible core of three to five solid carbonaceous segments of generally equal volume and of wedge-like shape arranged around a collapse axis of the core in narrowly spaced apart relation to each other. Core includes spacers occupying a minor portion of the narrow spacing nearest the external periphery of the core and which are made of metal, glass, ceramic or mixtures thereof having a melting point below the highest temperature to which the core is subjected by molten material solidifying therearound, e.g. fusion-cast refractory. The segments are the larger parts of the core. Heat transferred from solidified molten material to core causes spacers to melt and allow segments to collapse inwardly toward collapse axis to accommodate cooling shrinkage of casting without cracking. Melted spacers can drain downwardly out of core. Design yields highly quenched microstructure in fusion-cast refractory, which is especially beneficial in tap hole blocks for steelmaking furnaces and vessels.

Abstract: The invention provides a method and apparatus for injection-molding at least a first part of a plastics manifold element onto an extruded, panel-forming plurality of juxtaposed, hollow elements, comprising the steps of introducing into one set of ends of the hollow elements protrusions which extend from a core defining the shape of at least part of the interior space of the final manifold to be formed; clamping the region of the set of ends accommodating the protrusions between first and second mold members which, together with the core delimit the cavity of at least part of the final manifold; injecting plastic material into the cavity; and removing the core, and the mold members, whereby a strong bond is formed between the hollow elements and the manifold.

Abstract: A multi-part form for casting concrete structural units having spaced parallel and vertical sidewalls and horizontally spaced parallel and lateral connecting arms therebetween, the connecting arms having mortises at the bottom and tendons at the top. A stationary base and support means has upwardly exposed surfaces for forming the bottoms of the sidewalls and the arms and a core means thereon forms inner vertical surfaces of the arms and portions of inner vertical surfaces of the sidewalls of the structural unit. Opposing movable sidewall form members form outer surfaces of the sidewalls and opposed movable arm and sidewall form members form outer surfaces of the arms and inner surfaces of the sidewalls outwardly of the arms. Sidewall end surface form members on the sidewall form members form the end surfaces of the arms. Tie and strip bolts respectively secure the movable form members in inner assembled positions and urge the members outwardly in a stripping operation after casting.

Abstract: A plastics gutter fitting (8, 11) has at least one transverse groove (10,17) receiving a sealing strip (16) and an inwardly turned clipping nib (9,15) extending across at least one end of a said transverse groove (10,17). The fitting is molded using a three part core of which two outer parts (4,4') can be moved convergently relative to a central part (3) for releasing a molding (8) therefrom. This molding method enables the reentrant where a clipping nib (9,15) extends across an end of a transverse groove (10,17) to be molded integrally in the fitting.

Abstract: An injection mold with a female mold portion and a male mold portion has a locking ring consisting of two releasably interconnected annular members with respective tapering inner centering surfaces which, in a mold-closed position, embrace respective outer centering surfaces of the two mold portions for holding them precisely aligned for molding a thin-walled cup between a tapered core of the male portion and a cavity wall of the female portion. The core is surrounded by a stripper ring which is received with a certain amount of axial play between internal shoulders of the locking-ring members for joint entrainment by a stripper plate when the mold is opened.

Abstract: A mold has at least two primary mold parts movable in a primary direction away from each other from a closed position defining a mold cavity to an open position, and at least one secondary mold part which may be a core pin or a stripper which is movable in the secondary direction transverse to the primary direction relative to at least one of the primary mold parts. An actuator has a primary rack extending parallel to the primary direction and a secondary rack extending parallel to the secondary direction and secured to the secondary mold part. These racks have respective primary and secondary rows of teeth having substantially parallel tooth flanks inclined to the respective directions, the primary row meshing with the secondary row.

Abstract: A mold for the production of a reinforced plastic tubular body having an annular groove such as a pipe coupling, the mold having a mold body and detachably mounted on a predetermined position thereof, an annular groove former consisting of a surface layer of an elastic material and a core covered with the surface layer. The reinforced plastic tubular body is produced by forming a layer of a molding material around the aforesaid mold, curing the layer of molding material, separating the mold body from the cured layer of molding material, and then separating the annular groove former from the cured layer of molding material by removing the core and then removing the surface layer.

Abstract: The invention provides an improved cooling arrangement for the core pin of a commercially available injection molding machine permitting a significant reduction in the cycle time of such machine. The core pin is fabricated by the assembly of a plurality of concentric sleeve-like members, one of which is provided with six parallel helically disposed external grooves which respectively define three parallel passages for cooling fluid inlet and three parallel outlet passages for the heated fluid. The arrangement provides a significant increase in the quantity of cooling fluid flowing through the core pin, hence permits a significant decrease in cycle time of the injection molding machine.

Abstract: A method and apparatus for forming a continuous cooling liquid passageway through two separable injection mold dies when they are closed with a supply system flowing cooling liquid at a less than atmospheric pressure at least at the junction of the dies through the passageway only when the dies are closed and air when the dies are opened and the passageway is discontinuous.

Abstract: Articulated mold for the manufacture of molded objects having opposed undercut parts comprises two dies whose parting surface passes between the opposed undercut parts of the molded object. In each die there are provided shells composed of segments which can be displaced by pushers in order to open the mold and eject the molded object.

Abstract: This invention relates to a device for forming a pre-set void in a floor, wall or other structural member, to thereby define an essentially integral spatial void or closure therein, which maintains the UL fire rating of the floor or other structural member in which it is positioned, and which may be readily removed, when desired, to define the void, without use of special tools or procedures. The device is useful for defining modular or other openings to receive, for example, insert devices, through which cables, such as power and telephone lines, may be passed from a source, for connection with fixtures, phones and other devices. The device is adapted to be secured to forms, for example so that a material such as cement or other floor, wall or other structural forming materials may be positioned or poured thereon and therearound; the device in such cases may form a preset-sealed part of the structural member, readily available for opening when desired.

Abstract: A method for axially extracting a rubbery hose article of manufacture of great length from the correspondingly long core about which the article has been formed and vulcanized, comprising the steps of positioning the article having its core thereinto on an correspondingly long longitudinally displaceable support having an upper surface adapted for frictionally engaging the hose article, securing one end portion of the core, external to the hose, in a stationary location, and longitudinally displacing the support for spacing the same from said location, whereby a pull is exerted at any point of the length of the hose for causing the core to be extracted from the hose. A device for carrying out the method.

Abstract: A method and apparatus for forming a continuous cooling liquid passageway through two separable injection mold dies when they are closed with a supply system flowing cooling liquid at a less than atmospheric pressure at least at the junction of the dies through the passageway only when the dies are closed and air when the dies are opened and the passageway is discontinuous.

Abstract: A system for preventing a mandrel located inside a mold from deflecting during the initial stage of the injection of thermoplastic material into the volume defined by the mandrel and mold is provided. A reciprocating centering member is coupled to a supply of thermoplastic material and is coaxially positioned with respect to the free end of the mandrel. During the initial stage of injection, the force generated by the injection pressure will urge the centering member into a recess defined by the mandrel. The centering member defines a fluid flow channel permitting the thermoplastic to be injected via the channel into the volume defined by the mandrel and mold. When substantial injection has occurred, the mold back pressure and a spring bias will move the centering member out of engagement with the mandrel.

Abstract: Thermometer probe covers having an extremely thin wall integral tip for enhanced heat transfer are injection molded by unique mold core construction and venting configuration. A tungsten carbide core minimizes core deflection to maintain improved concentricity of core and cavity. Maintainance of concentricity in quantity production apparatus is improved by a combination of relatively loose cantilevered mounting of an end of the core together with a press fit locking of the core upon closing of the mold. Venting of cavity gas during injection of mold material is precisely controlled through symmetrically distributed vent orifices in both the core and the female mold part. Core venting is controlled by a plurality of orifices and a manifold provided by a water cooled core vent pin within a bore of the core.

Abstract: A die mold is disclosed for the manufacture of crate like containers having lateral walls at least the upper portion of which are double-walled to provide substantial stability to the container and strength to the container walls. The die mold includes a base plate, lateral wedges which move upwardly and downwardly at an angle to the vertical during opening and closing of the mold, and slider means which are positioned on the lateral wedges and are movable with respect to the lateral wedges in a reciprocal direction relative to the walls of the containers formed by the die mold. Holding means is provided for holding the slider means in the same position relative to the container during mold opening, and control means are provided to permit the slider means to move back from the container walls after the container has been moved a predetermined distance away from the base plate.

Abstract: An injection moulding apparatus having an injection mould and a mandrel insertable within the mould is provided with frustoconical co-operating surfaces on the mandrel and mould respectively which are adapted to engage with one another when the mandrel is inserted in the mould. A sliding connection is provided between the mould and its carrier so that the engagement of the conical surfaces can effect alignment of the axis of the mould with the axis of the mandrel. A locking device is provided for locking the mould to the carrier together with a locking control mechanism which releases the locking device as the conical surfaces approach one another and locks the mould to the carrier when the conical surfaces are fully engaged.

Abstract: A molding device including a rigid container defining a molding chamber and a mating collapsible member with walls and a floor and of a normal size and shape to mate in the rigid container and define a molding space between the container and the collapsible member; the collapsible member includes means to collapse it through a first stage of movement of withdrawal of the walls inwardly from a molded object and a second stage of movement of withdrawal of the floor axially upwardly away from the container and a molded object.

Abstract: Fusion-cast articles of refractory material are formed with cavities or hollow portions by means of apparatus and method employing a core formed of material more refractory than the fusion-cast refractory material, which core is disengaged from the refractory material solidifying therearound when such solidified portion has the capability of maintaining its integrity and shape absent support of the core, but before cooling shrinkage of the solidified portion onto the core has caused cracking of such portion. A stored energy device is connected to the core through an aperture in the mold which is sealably engaged by the core, and upon release of the stored energy, the disengagement of the core is effected, e.g. by at least partial removal from the mold through the aperture.