Abstract: The invention relates to a device for injection moulding insulating disks onto the inner conductor of high-frequency coaxial cables comprising a cylindrical tool carrier which is rotatable about its axis and at whose circumference are located radially arranged forming nests for forming the insulating disks and which are provided with moulding ducts extending radially outwards, wherein the forming nests, through the centers of which passes the inner conductor, can be opened and closed. The injection nozzle of the device takes the form of a slot, the longitudinal direction of the slot extending in the circumferential direction of the tool carrier and the longitudinal dimension of the slot being larger than the diameter of the moulding ducts. The film of moulding material formed on the surface of the tool carrier and interconnecting the individual insulating disks is torn off the insulating disks by means of a suitable separating member at an area of the tool carrier at which the forming nests are still closed.

Abstract: A mold for molding a wheel cover for a vehicle road wheel by injection molding of a synthetic resin or die casting of a light metal alloy, the wheel cover being a one-piece member having spoke-like portions extending obliquely with respect to both the center axis and radii of the wheel cover. To form the spoke-like portions each as a straightly extending portion, one of the two mold members which can be brought into contact with each other to provide cavities therebetween has a portion in the form of a truncated pyramid and the other is recessed to have a plurality of flat faces which are respectively opposite to and can mate with the flat side faces of the truncated pryamid, and these side faces or the flat faces in the opposite mold member, or both, are formed with elongate and straight grooves in which the spoke-like portions are formed.

Abstract: In an apparatus for encapsulating objects in molded plastic packages, an improved removable cavity plate assembly comprises upper and lower cavity plates which fit together in an interlocking manner to define molding cavities having integral surfaces formed within a single cavity plate on all sides of the cavity but one. The fourth side of each cavity is defined by a surface formed by the interlocking juncture between the two cavity plates. Plastic packages molded in the cavities thus are formed without a seam or parting line along the sides formed on the integral molding surfaces, the seam or parting line being formed only on the surface defined by the juncture of the two cavity plates.

Abstract: Molding apparatus for encasing a wood pallet in plastic including a press with plural platens and plural carrier plates between the platens. The carrier plates carry plural mold frames between each pair of carrier plates. Each frame has an injection part. Movable means are included for connecting the mold injection parts with the resin supply. The frames are disposed at an angle to the horizontal for easy venting.

Abstract: A multiple hot runner injection bush for lateral tunnel gating, with a foot and a shaft heated by a heating element and a central hot sprue arranged therein, furthermore, with a heated nozzle head which contains radially extending injection channels. The technical problem of the invention is seen in the exact heat control and adjustment of the nozzle head if a plurality of mould nests is gated. The nozzle head is provided as a plate-like head and projects beyond the diameter of the shaft by a multiple distance of the diameter of the shaft (two times through five times). The nozzle head incorporates, at least, four radially extending injection channels. The nozzle head comprises a plane ring face, adjacent to the shaft, and an outer covering apron. A copper ring is attached on the ring face. The copper ring carries a spirally arranged high capacity coil heater.

Abstract: A method and apparatus of making hollow plastic articles are disclosed in which the preforms or other articles are sequentially molded from a continuous stream of plasticized resin supplied by an extruder. The preforms are formed sequentially in a plurality of molds and immediately transferred from the molds to blowing apparatus where they are blown into plastic articles. The molds are disposed in sets of two or more molds each, and the number of blowing apparatus units is equal to the number of sets of molds, with at least two sets of molds being provided. After the preform is formed in one mold of a set of molds, it is transferred while it is still hot to the corresponding blowing apparatus for that set while the extruded stream of plasticized resin is fed into the other molds to form other preforms.

Abstract: This relates to an apparatus for injection molding preforms for beverage bottles wherein a minimum cycle time is involved. Cores over which thermoplastic material is injection molded to form preforms for use in the blow molding of bottles are provided in sets and carried by a rotary turret so that as soon as the injection molded thermoplastic material has sufficiently set to permit its transfer with its associated core out of an injection mold cavity, the apparatus may be actuated to remove first injection molded preforms and thereafter immediately present a new set of cores to the injection mold cavities. This provides ample time for the cooling of the preforms so that when removed from the cores they will not be unduly deformed. In accordance with the feasible use of the apparatus, plural preforms, on the order of twenty-four and greater, may be formed with a cycle time on the order of 10-12 seconds.

Abstract: Provided is a method and apparatus for molding and winding in a continuous operation a string of molded items. The molded items of the string or chain are molded in spaced relationship to one another and are connected by molded scrap connectors. The string of molded items is then advanced until only a trailing connector of the last molded item extends into the mold cavity. Upon subsequent molding operation, therefore, the subsequent molded item is molded integral with the existing string of molded items. The continuous string of molded items is kept under constant tension and wound periodically into a coil. The molding, advancing, tensioning and winding operations are all integrated and synchronized in order to provide a wound package which greatly facilitates its use in an automatic assembly operation.

Abstract: A four-sided turret interposed between a fixed and a movable platen of an injection-molding machine, mounted on a carriage which is slidable in the direction of platen motion, is rotatable about an axis perpendicular to that direction into four operative positions spaced 90.degree. apart. In each of these positions, in which one or more cores carried on one of its faces enter respective cavities of a confronting mold plate on the fixed platen while a corresponding core or cores on an opposite face are received in a companion plate on the movable platen, the turret is positively indexed by two aligned pins on these plates which enter respective bores in the turret upon closure of the mold; such closure, conversely, is prevented by the pins until the turret is in the proper position.

Abstract: A process and a molding unit for the automatic molding, expelling and assembling to one another of at least a pair of plastic handles for a plastic bag, consisting of a male and female handles (A and B) and provided with snap fastening means for closing said bag, characterized by the use of a molding unit comprising:two mold blocks, each having a cavity for removably receiving a mold, respectively said cavities and the molds forming two juxtaposed molding chambers, separated from one another by slidable wall members constituting in combination the countermolds of the two respective molding chambers in operative position thereof,means for moving the mold blocks together with the molds to and from one another,means for slidably moving said slidable wall to and from its closing position,injection means for feeding molded plastic material into both molding chambers shaped to form a female and a male handles (A and B),punch means to form in each male handle (A) each pin of the snap fastening means as well as the r

Abstract: A method of automatically controlling the length of a row of articles to be injection-molded on a multi-cavity mold having an elongate runner and a plurality of successive cavities spaced equidistantly along the runner, comprising the steps of: detecting an initial position of a control rod inserted in the runner; registering both the direction and the extent to which the control rod is to be moved for longitudinal adjustment with respect to the runner, depending on the initial position of the control rod and a preselected length of the article row to be molded; moving the control rod longitudinally of the runner in the registered direction; detecting the movement of the control rod to the registered extent; and in response to the last-named detecting, terminating the movement of the control rod. An apparatus for carrying out this method is also disclosed.

Abstract: A process and a device for forming a tennis ball by the formation of two semispherical bowls in crude elastomeric material each having on its border a structural shape that is deformed by compression when the two semispherical bowls are pressed one against the other while a depressurization is effected in the joining zone of the two semispherical bowls on the outside of them.

Abstract: A mold apparatus which in addition to the other mold elements, has shuttle plate means adjacent to the nozzle means out of which the molding composition comes out of into the mold cavity, which shuttle plate means forms part of the mold cavity. The shuttle plate means are adapted to automatically take a finished molded part from the mold and remove it out of the mold apparatus. At the same time while the molded part is being taken out of one portion of the shuttle plate means, the other part of the shuttle plate means is being utilized to form a molded part.

Abstract: An injection molding apparatus includes an injector portion which includes a plurality of mold cavity modules each having a plurality of cavities cooled by fluid flowing through a plurality of cooling channels which communicates with a common coolant manifold. Each mold cavity module is supplied with molten plastic material by a separate manifold which consists of an elongated shell having an exterior surface defining at least one inlet sprue communicating with a source of plastic and a plurality of outlet gates each communicating with a cavity of the mold module, a tubular heating element positioned within the shell for heating the interior portion of the shell, and a plurality of runners extending from the inlet sprue to the outlet gates and spiral about the heating rod so that molten plastic material may flow from the inlet sprue through the runners to the outlet gates and receive heat energy from the heating rod.

Abstract: A method and apparatus is provided for making a composite structural homogeneous resinous article having (a) a smooth, shiny non-cellular or homogeneous relatively thin injection compression molded liner on the outer surface and (b) a cellular relatively thicker injection molded core integral with the molded liner. One extruder is connected by valve controlled passages to a pair of injection devices, each device having an injection chamber. One chamber stores the homogeneous plastic resin and the other chamber stores the foam plastic resin. A first mold assembly having a movable upper mold part and a stationary lower mold part form a cavity, with a gap opening, at a first molding station. The cavity is in communication with the first injection chamber.

Abstract: In molding a number of articles of plastics at the same time with use of an upper mold and a lower mold having a multiplicity of cavities in the fitting surfaces thereof, a process for molding plastics by supplying the molding material to a plurality of pots each provided for one pair of cavities in proximity thereto, and injecting the material into the cavities from the pots through gates without passing the material through any runner. An apparatus for practicing the process is also disclosed. The waste of the molding material can be reduced at least by the amount conventionally needed for filling the main and auxiliary runners.

Abstract: A molding machine for encapsulation including a transfer molding die provided with a plurality of pots which comprises a transfer molding press, a molding die including a plurality of pots allowing for the passage of plungers integrally formed with the rods of the cylinders, a plurality of runners branched off from the pots, a plurality of cavities connected to the runners through the corresponding gates, and displacement transducers for detecting the rate of the displacement of the plungers, variable flow rate control valves communicating with lines connected to the cylinders, and a control circuit for controlling the operation of the variable flow rate control valve in accordance with output signals from the displacement transducers, thereby causing the plungers corresponding to cylinders to be moved exactly at the same speed.

Abstract: The invention relates to an injection mechanism for molding plastics, comprising at least one injection bushing, at least one lower needle valve, which is supplied by the injection bushing with molten plastics and opened by the pressure of the molten plastics during injection, further comprising heating means and cooling means adjacent to the flow path of the plastics, control means for maintaining the plastics at an adjusted temperature, further control means for injecting the molten plastics into at least one mold cavity via a corresponding injection aperture, and for the closing off the mold cavity after finishing the injection, wherein for improving this mechanism, especially for facilitating very small distances between injection openings, only one plunger within a heated distributor block is provided, which actuates several needle valves, situated at different locations within the distributor block, for supplying the molten plastics to the mold cavity via one single injection bushing, an injection nozzl

Abstract: This invention relates to a molding apparatus capable of producing flashless molded parts due to a perfect surface-to-surface mating of a pair of molds. The molding apparatus comprises an upper holding means for holding at least one upper mold having a path in which a moldable material is passable, and a lower holding means for holding at least one lower mold having a cavity, wherein a certain amount of fluid substance is filled between a bottom surface of the lower mold and the lower holding means, thereby the lower mold being floatable on the fluid substance and movable along the lower holding means, subsequently a joint between the upper mold bottom surface and the lower mold top surface being realized perfectly due to a back pressure of the fluid substance.

Abstract: This machine has a turret which rotates about a horizontal axis on a frame that is movable into and out of a loading position adjacent a rotary extruder. The turret comprises a tubular shaft, a plurality of axially spaced, circular plates secured to the shaft coaxially thereof, and a plurality of identical, radially projecting panels that are secured in registering radial slots in the circular plates. A separate mold is mounted in the angular space between each pair of adjacent panels, and comprises a stationary section fixed to one of the circular plates for rotation therewith, and a movable section mounted for reciprocation by a collapsible linkage into and out of a closed position against the associated stationary section.

Abstract: The apparatus of the present invention includes a stationary assembly and a movable assembly. The stationary assembly is comprised of a stationary platen which has a heat plate mounted thereon, a temperature-controlled sprue bushing mounted in the heat plate and a plurality of mold faces positioned on the heat plate surrounding the periphery of the sprue bushing. The movable assembly is comprised of a movable platen which has a heat plate mounted thereon and a plurality of mold faces, corresponding to, and adapted to be aligned with, the mold faces on the stationary assembly. Means are provided to move the movable assembly into close proximity with the stationary assembly to form partially open mold cavities. Means are provided to feed a supply of thermosetting molding material through the sprue bushing into a manifold area and into the partially open mold cavities. Means are provided to completely close the mold cavities and place the apparatus in a compression stage.

Abstract: An apparatus for producing small molded bodies with overhanging portions, e.g. for use as end stop members in slide fastener stringers, wherein a molding band is fed to a forming wheel to define individual molding cavities therewith, the cavities passing to a molding station at which a synthetic resin material is injected into the cavities. According to the invention, the band consists of a plurality of band members which upon being fed to the wheel, form a core with undercut formations around which the synthetic resin material is molded and, following molding, the band portions are laterally or orthogonally offset to release the articles drawn by the band out of forming beds on the wheel.

Abstract: An end capping machine is disclosed wherein a plastic end cap is formed and bonded to a cardboard sleeve so as to form an integral, wide-mouth container. Each cap is formed and thermoplastically bonded in essentially one-station of a multi-station operation. The machine of the present invention is particularly useful in forming oil cans, and eliminates the need for the conventional metal base and sides.

Abstract: Composite moulded rubber or plastic articles, each comprising two distinct parts separately formed by injection moulding of different materials and subsequently joined together by vulcanising or the like, are produced in a dual purpose apparatus that simultaneously moulds two separate parts and bonds together two previously moulded parts.

Abstract: Apparatus for injection moulding thermoplastic material is disclosed wherein a heavy-duty sprue bush is heated along a substantial portion of its length to keep the thermoplastic material from solidifying during interruptions in the moulding cycle. The apparatus provides for minimal contact between the heated sprue bush and the moulding die to prevent heat transfer between them. This is achieved by maintaining an air gap between the bush and the die except at points where the thermoplastic material passes into the moulding cavity. Sprue runners oriented generally parallel to the mould joint line are aligned with cavity injection openings which are similarly oriented. These injection openings pass through a thin wall of the mould that extends generally perpendicularly to the joint line such that when the moulds are open, the sprue is cleanly severed from the moulded article.

Abstract: This invention relates to an edge gated injection molding system. An electrically heated sprue bushing is seated in a well in the cavity plate with a centrally extending melt runner passage which branches radially outward with separate channels leading to a number of edge gates in the cavity plate. An air gap is provided to insulate the hot sprue bushing from the surrounding cooled cavity plate and a hollow seal is provided at each gate to convey the melt across the air gap. Each seal is in alignment with one of the channels and one of the gates, and has its inner end seated in a recess in the sprue bushing and its outer end abutting against the curved wall of the cavity plate. The outer ends of the seals are dome shaped so that they are slightly resiliently deformable. A portion of the wall of the cavity plate is slightly inwardly tapered so that at the gates, the effective combined diameter of the sprue bushing and the seals is slightly larger than that of the well.

Abstract: A cavity plate means is removably positioned between upper and lower mold plates with the upper surface of the cavity plate means flush against the upper mold plate. The cavity plate means has openings from top to bottom thereof and holds objects spaced from the upper mold plate with the portions of the objects which are to be encapsulated being in registration with the cavity plate openings. Fluid plastic is forced laterally through feed runners formed in the surface of the upper mold plate and downwardly through gates into the cavity plate openings. After the plastic has hardened, the plastic ejected from the feed runners of the upper mold plate and the cavity plate means is removed. Preferably the objects are pre-mounted on the cavity plate means, and the lower cavity plate surface is positioned flush against the lower mold plate which is uninterruptedly flat.

Abstract: A four-sided turret interposed between a fixed and a movable platen of an injection-molding machine, mounted on a carriage which is slidable in the direction of platen motion, is rotatable about an axis perpendicular to that direction into four operative positions spaced 90.degree. apart. In each of these positions, in which one or more cores carried on one of its faces enter respective cavities of a confronting mold plate on the fixed platen while a corresponding core or cores on an opposite face are received in a companion plate on the movable platen, the turret is positively indexed by two aligned pins on these plates which enter respective bores in the turret upon closure of the mold; such closure, conversely, is prevented by the pins until the turret is in the proper position.

Abstract: The invention relates to a method of producing molded bodies of expanded plastic having a predetermined density, based on a starting material in granulate form to which a blowing agent and optionally a cross-linking agent have been added, said starting material being introduced into an injection molding machine/press in which it is heated and injected/pressed into a mold. In order to obtain an efficient production process without loss of raw material and a product whose density can be determined in advance, the material in the injection molding machine/press is heated to a temperature which is below the temperature required to initiate the reaction of the blowing agent/cross-linking agent, and the blank thus formed is subsequently transferred to an expansion mold having the shape of the desired final product, but larger, than the blank. The blank is caused to expand in the expansion mold and final expansion takes place outside the expansion mold.

Abstract: This mould assembly for elastomers is of the type comprising a center block whose temperature is regulated. The block has means for injection of the elastomer into each mould cavity fed with elastomer by a nozzle of the injection device of the press. The center block has projections which are mounted on the block, or are part of the same material as the block, and project from two of opposite sides of the block. Small nozzles for directly injecting the elastomer into the mould cavities are detachably secured on the ends of the projections and adapted to cooperate with adjacent sections of at least two moulds in two or more sections which are disposed on the opposite sides of the center block. Means distinct from those of the block are provided for separately controlling the temperature of the projections and of the small nozzles. Means are provided for controlling the flow through the small nozzles. Means are provided for compensating for the expansion of the block and the moulds.

Abstract: Two component polyurethane soles for footwear are molded continuously in an apparatus including a turntable with a plurality of mold stations therearound. While a first sole portion is being molded at one mold station, a second sole portion interconnecting the first sole portion to a lasted upper is molded at the same mold station. Such simultaneous molding is achieved using a mold bottom or top which retains the first sole portion and with such first sole portion forms part of the mold for forming the second sole portion. The second sole portion mold is completed by mold sides and a lasted upper.

Abstract: A polycrystalline article is densified to provide either a nonporous body or a body with controlled interconnected porosity. A mixture of fine powders of the polycrystalline material and a sintering aid is compacted and outgassed under reduced pressure. The outgassed compact is then subjected to a permeation anneal step in which it is heated in a closed chamber to a temperature sufficient to form a liquid of the sintering aid, but under pressure conditions which inhibit evaporation of the sintering aid. The sintering aid can then be leached out to provide a densified article having interconnected porosity. Alternatively, the sintering aid can be leached out at elevated temperature, further densifying the compact to form a substantially nonporous body. Alternatively, the sintering aid can be removed by subjecting the densified article to an evaporation anneal step in which the article is heated to evaporate the sintering aid, further densifying the compact to form a substantially nonporous article.

Abstract: An apparatus for molding tires comprises a first turntable on which a plurality of mold carriers are mounted circumferentially spaced from each other and each removably carrying a split core configurated to define the inner surface of a tire to be molded and a plurality of outer mold parts arranged about the core and configurated in accordance with the outer surface of the tire, a second turntable adjacent the first turntable and provided on its upper surface with a plurality of first depositing stations equal in number to that of the plurality of mold carriers of the first turntable for respectively receiving the cores and a plurality of second depositing stations equal in number to said first plurality of depositing stations for respectively receiving finished tires. The two turntables are turnable stepwise and synchronously, preferably in opposite directions, about vertical axes.

Abstract: A molding apparatus and method are provided for forming patties from an agglomerable edible material such as meat. The apparatus includes a turret which rotates between a feed station where the edible material is fed upwardly under pressure into one of a plurality of mold cavities and a discharge station where each formed patty is ejected by a piston. An improved sealing means is provided for effecting sealing engagement of a feed spout assembly with the bottom surface of the rotating turret. An improved cut-off band is also provided for separating the formed patties from the turret at the discharge station. Reciprocation of the piston in each mold cavity is regulated by a control means which includes means for limiting the free upward movement of the piston until the cavity opening is fully aligned with a feed opening in the feed spout assembly.

Abstract: An apparatus for molding a blank of stoppers from synthetic resin, each of said stoppers including a crossbar, a filament portion and a head. The filament portion has a smaller-diameter portion near the crossbar and a larger-diameter portion extending from the smaller-diameter portion toward the head at least on a portion to be stretched.Metal mold members adapted to act as a drawing die are engaged to the connecting portion of said smaller-diameter and larger-diameter filament portions, and after the stoppers have been molded, the members forming the die are moved along the filament portion so that only the crossbars are gripped by the metal mold to prevent movement thereby subjecting the filament portions to stretching.

Abstract: A system for mass producing prestressed concrete railroad ties using a slip-forming method of casting concrete over a plurality of molds arranged side by side and end to end on a casting bed; a specially equipped continuous casting machine for slip-forming the railroad ties in an upside-down orientation; techniques and equipment for separating and removing finished railroad ties from the casting bed; a plant layout to facilitate casting and handling operations; a specially adapted apparatus for rotating groups of railroad ties to permit stacking thereof in right-side-up orientation.

Abstract: A process for producing cork lines which comprises holding a leader or leaders with a pair of metal molds having at the junctional surfaces thereof one or more cavities for forming a float or floats and one or more furrows formed so as to pass through said cavity or cavities for holding said leader or leaders, injecting a molten synthetic resin mixed with a foaming agent into said cavity or cavities to effect molding and foaming of said resin, cooling said metal molds and taking out a float or floats integrally fixed to said leader or leaders from said metal molds.

Abstract: The invention relates to a mould, more particularly an injection mould, for the production of half-finished mouldings or parisons, more particularly Apex rings, from work materials on a rubber basis in a mould cavity bounded by at least two mould parts, more particularly by an upper mould or a lower mould and an intermediate plate.

Abstract: The method of making valued plastic articles, such as game tiles and the like, comprising providing in one of a pair of separable mold members ejector pins for forcibly ejecting the tiles and severing them from residual plastic and providing in the other mold member protuberances which form indentations in one face of each tile which are essentially identical to indentations formed in the other face by the ejector pins. Indicia designating the value of a tile is subsequently applied to either face, the necessity of sorting of the tiles prior to application of indicia being eliminated by the invention.

Abstract: Molten synthetic resin material containing foaming agent in an amount of 0.05 to 5 percent by weight is injected into a pre-pressurized mold cavity in a mold which is closed by a relatively low clamping force having a coefficient in the range of 10 to 40, said coefficient being represented as a ratio of clamping force to maximum injection shot volume. The above injection step is carried out for at least 3 seconds. After the injection step has been initiated, the pre-pressurized mold is released to atmosphere during the injection step at the soonest. At least two molds may be used to be alternately charged with said material.

Abstract: A apparatus are disclosed for molding plastic articles, wherein the method includes the steps of filling a mold cavity at a first station with heated flowable plastic material and then displacing the mold to a second station where the plastic material is cooled under pressure. The apparatus includes a rotatable support for displacing the mold between the first and second stations, a plastic supply means at the first station to fill the molds, and a displaceable rod at the second station for insertion into the mold to apply pressure to the plastic material during solidification cooling.

Abstract: A method and apparatus are disclosed for injection molding tubular plastic articles around cylindrical core pins at a molding station, for cooling the articles while supported on the core pins, and for then axially stripping the articles from the core pins at an ejection station. The article stripping step is accomplished by a horizontally reciprocable carriage which is selectively moved into and out of vertical alignment with a set of core pins and molded articles positioned at the ejection station. Sectional gripping members on the carriage are radially closable when in alignment with the molded articles, to grasp the articles for their axial removal from the core pins upon the horizontal displacement of the carriage. The stripped articles may be held in a horizontal cantilever position between the gripping members during an operational dwell time for additional cooling subsequent to their removal from the core pins.

Abstract: A central chamber of a mold body, communicating through a heated nozzle with a supply channel, has a plurality of peripherally spaced injection orifices opening into respective cavities for the molding of tubular articles such as shells of disposable syringes, each cavity being defined by a generally cylindrical recess in the mold body paralleling the nozzle axis and a core received with all-around clearance in that recess. Each cavity has two elongate sections of larger and smaller diameter interconnected by a wider annular gap at the level of the injection orifices; the axial width of the annular gap progressively diminishes with increasing distance from the corresponding orifice.

Abstract: A body having rubber material thereon is positioned on a lower member, and an upper member is moved toward the lower member, such relative movement causing tread-forming shoes to move to inward positions to form a tread on the rubber material. As an alternative, the upper and lower members may be brought together, and rubber material may be injected into position to have a tread formed thereon. Upon movement of the upper and lower member relatively apart, the rubber material is made to remain in contact with the shoes, and the body is removed, whereupon an annular core having rubber material thereon is disposed on the lower member, and the upper and lower members are again brought together to deposit the rubber material in contact with the shoes onto the rubber material on the core.

Abstract: A body having rubber material thereon is positioned on a lower member, and an upper member is moved toward the lower member, such relative movement causing tread-forming shoes to move to inward positions to form a tread on the rubber material. As an alternative, the upper and lower members may be brought together, and rubber material may be injected into position to have a tread formed thereon. Upon movement of the upper and lower member relatively apart, the rubber material is made to remain in contact with the shoes, and the body is removed, whereupon an annular core having rubber material thereon is disposed on the lower member, and the upper and lower members are again brought together to deposit the rubber material in contact with the shoes onto the rubber material on the core.

Abstract: A molding apparatus and method of molding or casting liquid resins and the like, are provided which includes flexible molding means. In one form, the mold is composed of two endless flexible belts, each of which is driven in an endless path with a portion of each belt driven parallel to a portion of the other belt and in contact therewith such that cavities formed in each belt come into alignment with each other when the belts make contact. Fast setting plastic liquid resin molding material is injected either at the side of or from the ends of the belts as they come together and flows into the cavities formed in the belts to continuously form a molded material or individual molded articles between the belts. After the molding material has solidified in the cavities between the belts, the belts are automatically driven apart and the molded articles removed from the cavities therebetween.

Abstract: Upper and lower injection mold halves forming between them successive spaces defining the configuration of parts that are to be injection molded and integrally joined into a compound structure. Movable plate means are transversely disposed between the successive spaces and have an aperture. The plate means initially blocks fluid communication between successive spaces in the mold so that one part can be injection molded, followed by injection molding of the second part after the plate means has been moved so that its aperture allows the injected plastic material of the second part to flow through the aperture and into contact with the molded first part, thereby plastically uniting the two parts into an integral or compound structure.

Abstract: A pneumatic tire is moulded using a mould core of cured rubber the radial sectional shape of which is the same as the internal radial sectional configuration of the finished tire. The opposite sides of the core are supported by fitting plates while a tread portion of tire is moulded onto the exposed outer periphery of the core. Thereafter the side plates are removed in turn and replaced by sidewall mould halves enabling sidewalls to be moulded against the core in contact with the tread portion.

Abstract: A process for producing shaped parts from synthetic and similar workable materials by filling molds under pressure, hardening and removing the articles from the molds. Movable, essentially identical mold carriers are provided with article-related mold inserts preselected for the work cycle and locked in place in the carriers. The forming tool is filled with the synthetic, it is exposed for a given time to certain temperature and pressure conditions, the tool is opened and the inserts are expelled. The form carriers are then outfitted with another set of form inserts while the first set of mold inserts are removed from the molding cycle.

Abstract: The following specification describes a paint can mold in which a pair of concentric ring members and cores at diametrically opposed positions create concentric mold cavities for forming projecting bushings on the pail, each having a concentric handle bearing. The plastic for forming each bearing and a handle interconnecting the bearings passes through a gate in each ring member. Withdrawal of the ring member severs the plastic in the gate from between the bushing and bearing so that the handle is free to rotate on the bushings. Means are provided to prevent disassembly of the handle from the can.