Abstract: An elongate packing is sandwiched between two sheet-like mold members in an encircling manner to define a mold cavity therebetween, then a thermosetting plastic material is poured into the mold cavity, and the thermosetting plastic material is heated and set in the mold cavity. The upper and lower mold members are held against deformation transverse thereof so as not to be deformed by the shrinkage of the thermosetting plastic material when the latter is set, and the packing is allowed to move transversely thereof for following the shrinkage of the thermosetting plastic material when the latter is set. In some embodiments, the packing comprises a packing body adapted to be sandwiched between the mold members for preventing the plastic material from flowing out of the mold cavity with a flange joined to the packing body and adapted to be held against peripheral edges of the mold members.

Abstract: A method for drain-casting a slip to obtain a substantially hollow molded article 42 is provided, by the use of an apparatus including a divisible mold 21 including an upper mold portion 22, a lower mold portion 23, and at least two side mold portions 24, 25 to form a mold cavity 38, each mold portion containing a filter member and a water-drainage means, and the lower portion having a slip supply duct 40.

Abstract: A process for dry fiber winding in the absence of resin and subsequent resin impregnating of objects such as projectile bodies having a recessed area for receiving the windings. The process includes winding the projectile body with dry glass or other dry fibers in the absence of resin, placing the wound projectile body into a heated mold, applying a vacuum, pressure injecting a metered amount of resin into the mold, applying pressure to the resin by means of a pressurized ram to impregnate the fibers, allowing the resin to cure to the gel stage within the mold, removing the projectile body from the mold without distrubing the gel surface, and completing cure of the resin at room temperature or in a curing oven.

Abstract: A process for forming a plastic part having a tubular portion that is continuous and without an flash/mismatch due to mold parting lines in which an injection mold is provided having a cavity formed with a cylindrical surface portion and a core member removably inserted endwise into the cylindrical portion. A molten plastic material is injected into the cavity so that it extends into the cylindrical portion and around the core member. The core member is then withdrawn in an axial direction from the cylindrical portion after the plastic material therein has solidified enough to retain its tubular shape but before it has completely to thereby enable the plastic material to shrink radially inwardly away from the cylindrical surface.

Abstract: An apparatus for making parts having complex geometric shapes by injection molding apparatus. The apparatus avoids the formation of a parting line in the molded object. The apparatus includes an injector plate, an ejector plate and a floating plate. The injector plate has at least one mold cavity for making a part and a passageway to allow molten plastic to enter the mold cavity. The ejector plate has at least one mold cavity corresponding to the mold cavity in the injector plate. The floating plate has at least one projection. The plates are adapted to fit together when the mold is closed so that the floating plate is between the injector and ejector plates and the projection fits centrally between the cavities of the injector and ejector plates. A mechanism moves the injector plate, ejector plate and floating plate with respect to one another.

Abstract: An improved method for moving a large, heavy, fragile, freshly-made concrete pipe section, with top and bottom pallets but without jacket protection, out of a casting machine, and directly into a kiln, for curing; moving the cured pipe section from the kiln to an unloading station, automatically removing the top pallet, removing the pipe section from the bottom pallet, cleaning the top pallet and then placing the top pallet on a reinforcing cage that has been set on the bottom pallet, ready for the next cycle. The cycle is continuously intermittant.

Abstract: A pin-grid package is created by starting with printed wiring boards that have plated through holes that can accommodate wire pins. Pins are secured in position to extend outward from one face of the PW board in the form of a pin grid array of the desired configuration which is typically a plurality of concentric rings thereby creating a square grid pattern of predetermined spacing. The opposing PW board face includes a central pin-free area to which is secured a semiconductor die. This face of the PW board includes a plurality of wiring traces that connect each pin to an array that surrounds the semiconductor die. The traces are connected to the bonding pads of the semiconductor die by either wire bonds or a spider assembly using tape assembly bonding. The PW board is located in a mold that has a flat faced first platen that contains cut-out regions that will accommodate the package pins.

Abstract: A mold, typically an injection mold, comprises a cavity member and a core member relatively movable between open and closed positions to define a first parting line and a molding chamber between the core and cavity members in the closed position. A sprue aperture is provided, communicating with the molding chamber to provide molding compound to the chamber. In accordance with this invention the cavity member defines forward and rearward portions movable between open and closed positions and proportioned whereby objects molded in the molding chamber can be removed from between the forward and rear portions when the cavity member is in its open position.

Abstract: A material handling device for transferring a formed good from an injection molding machine includes a pair of spaced tracks. Inner ends of the tracks are positioned below a mold carried by the machine with the track positioned transversely to opening and closing movement of the mold by the machine. On the track is a slidable basket which may be moved from the track inner end to an outer end away from the machine. Basket movement may be effected by activation of a pneumatic drive formed as part of the track and attached to the basket. During forming of a good, the basket is moved under the mold. When forming is complete, the mold opens and the good ejected. The good falls into the basket which has a cushion-like surface to inhibit damage. Opening of the mold starts a first timing period which lapses to activate the pneumatic drive to move the basket and good to the track outer end for good removal. During this first timing period the mold closes to begin a next forming cycle.

Abstract: A process for forming a plastic part having a tubular portion that is continuous and without any flash/mismatch due to mold parting lines in which an injection mold is provided having a cavity formed with a cylindrical surface portion and a core member removably inserted endwise into the cylindrical portion. A molten plastic material is injected into the cavity so that it extends into the cylindrical portion and around the core member. The core member is then withdrawn in an axial direction from the cylindrical portion after the plastic material therein has solidified enough to retain its tubular shape but before it has completely cooled to thereby enable the plastic material to shrink radially inwardly away from the cylindrical surface.

Abstract: Concrete elements, such as blocks or bricks, are molded or cast by forming in a primary mold cavity a secondary mold made of a portion of a thermoplastic film which has been contacted with a flat heater surface to assure a uniformly heated film portion which is then sucked into the primary mold cavity without wrinkles and filled with concrete mix. The secondary mold with the concrete mix in it is withdrawn, for example, sucked out of the primary mold cavity well before any effective hardening of the concrete mix, so that curing and hardening takes place in the secondary mold outside the primary mold cavity. This early withdrawing is important because it avoids expansion of the curing mix in the primary mold, whereby removal from the primary mold is facilitated. Additionally, the early removal with the aid of the secondary mold assures a more efficient use of the primary molds which are used again while the hardening is still going on in the secondary mold.

Abstract: An additive used in the production of concrete blocks comprises a mixture of water with attapulgite or peptized calcium bentonite. Problem concrete blocks which previously were normally subject to improper molding or cracking during the molding, unmolding, handling and curing steps during the manufacture thereof, are now easily produced and properly molded without cracking resulting during any of these steps. Whereas, it was previously nearly impossible to manufacture any acceptable concrete blocks without employing sufficient quantities of fines in the concrete block mix, the additive allows formation of acceptable concrete blocks in the absence of any fines at all, thereby enabling much more reliable production of standard blocks, thin-walled blocks, and even more lightweight blocks than heretofore possible, because the gradation and characteristics and relative proportions of the coarse and fine constituents of the aggregate in the mix are rendered far less critical than heretofore.

Abstract: A container closure includes a cap for sealing a container against leakage, and a brush for spreading contents of the container. The cap includes a top wall, an internally threaded skirt depending from perimetrical portions of the top wall, and a stem depending from a central portion of the top wall. The brush includes a plurality of bristles having (1) mounting portions which are secured to the lower end region of the stem, and (2) applicator portions which depend below the stem for brushing the contents of the container onto a surface. The cap is a one-piece structure having its brush-supporting stem formed integrally with other parts of the cap.

Abstract: Apparatus for making injection molded polymeric articles, comprising a vibratory pneumatic cooling assembly adapted to dissipate thermal energy from the polymeric articles after they are ejected from the mold cavities through use of an oscillating perforated vibratory grid adapted to maintain the articles in relative motion while at least partially supporting them on a substantially uniform cushion of air. A method for employing the apparatus of the invention to substantially reduce the cycle time required for injection molding polymeric articles is also provided.

Abstract: A moulding apparatus and a method of moulding for components of unvulcanized elastomeric material which forms a spew free component and provides for handling the component for subsequent use. The apparatus as shown in the Figures comprises a first mould member having a mould cavity for part of the component and a feed port for material and a second complementary mould member which includes a detachable component carrying insert. The two mould members and are relatively movable to provide two different volumes for the mould cavity, the change to the smaller volume being used to return some material through the feed port and to complete moulding of the component.

Abstract: An additive used in the production of concrete blocks comprises a mixture of water and sodium bentonite. Problem concrete blocks which previously were normally subject to improper molding or cracking during the molding, unmolding, handling and curing steps during the manufacture thereof, are now easily produced and properly molded without cracking resulting during any of these steps. Whereas, it was previously nearly impossible to manufacture any acceptable concrete blocks without employing sufficient quantities of fines in the concrete block mix, the additive allows formation of acceptable concrete blocks in the absence of any fines at all, thereby enabling much more reliable production of standard blocks, thin-walled blocks, and even more lightweight blocks than heretofore possible, because the gradation and characteristics and relative proportions of the coarse and fine constituents of the aggregate in the mix are rendered far less critical than heretofore.

Abstract: The present invention provides a linear slide ball bearing light in weight and suitable for guiding a high speed reciprocal movement, the linear slide ball bearing comprising a bearing case formed of a molded light weight material such as synthetic resin and aluminum, a pair of bearing races formed of a rigid material and attached to the bearing case, the bearing races being provided with no-load guide grooves for forming no-load ball guide holes in cooperation with no-load ball guide grooves on the bearing case side and load ball grooves, a raceway table having a rolling groove at the position corresponding to that of the load ball groove of each bearing race furnished in the bearing case, a pair of side covers fitted to both the left and right sides of the bearing case and provided with guide grooves in the inside surfaces in the circumferential direction for forming endless tracks by making both the ends of the no-load ball guide holes and the load ball grooves communicate with each other, and a number of

Abstract: A transparent thin bottle-shaped container is produced by means of a technology for biaxial orientation blow molding a cylindrical piece with a bottom from polyethylene terephthalate material. The pieces are molded in numerous large number in each injection molding process of an injection molding machine. The pieces thus formed immediately after the injection molding are held simultaneously in large number at the gates integrally projected therefrom by a base plate moved forward at the front of the mold in the injection molding machine. They are then conveyed to a gate cutting unit provided near the injection molding machine. The gates are cut from the pieces sequentially by the gate cutting unit and are conveyed onto a conveyor. The pieces are gradually cooled from the hot molded temperature during the conveyance and are additionally cooled while being conveyed on an oblique conveyor installed with a cooler to room temperature or lower predetermined temperature.

Abstract: A method of forming cast concrete modules made of a floor, two spaced apart upstanding walls, and a roof extending between the walls. The method uses casting beds in groups of four and one set of forms, two interior and two exterior forms, which are movable from bed to bed. By performing different steps of the method on different casting beds on different days, separate modules can be erected progressively on separate beds in a group of four, so that with one set of forms and one group of beds, three modules can be produced every eight consecutive days.

Abstract: A process for the production of a vulcanized latex protective coating bonded to the surface of an asbestos-cement article, particularly a pipe, is disclosed. The process includes a step whereby the latex coating is applied before autoclaving to the article, and becomes a hard, protective bonded layer during the autoclaving process.

Abstract: An annular tire tread belt is assembled of uncured resilient material having reinforcing cords. An annular container of resilient material has reinforcing cords extending between annular bead rings at the edges. The container is shaped in a toroidal configuration and the tread belt stuck to the container by a layer of suitable tacky barrier material with sufficient tack to maintain the tread belt in a centered position on the container for engagement with a centered portion of the mold. The barrier material also is sufficiently incompatible with the materials of the container and tread belt to prevent appreciable chemical bonding across the interface during curing of the tread belt. After at least partial curing of the tread belt, the tread belt is detached from the container and is ready for use in a tire.

Abstract: The process for producing a shaped article comprising a polythene terephthalate (PETP) core containing from 0 to 50% of mineral fillers and a covering layer of a second thermoplastics material having a softening point below that of the PETP. The second material and the PETP are injected one after the other into a mould which is maintained at a temperature below the crystallization point of the PETP having regard to its fillers. The second material injected in the first phase acts as a thermal buffer slowing down temperature equalization between the PETP injected in the second injection phase and the mould, thus ensuring the required properties in the PETP core.

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: Method for the stabilization of molded parts. Stabilization is achieved for parts ejected from a molding machine, by immersing the parts in a fluid medium during the course of their conveyance from a molding site. The result is thermal and/or fluid modification which gives stability to the parts, allowing them to be controllably conveyed away for further processing. This can permit early ejection of parts from the molding machine and enhance production capacity.

Abstract: The installation comprises a rectangular, parallelepipedal, leaktight steam chamber (1) provided with a gate (2) on one of the short sides, inside which a tubular fixed mold (4) of perforated steel plate is attached at a distance from the walls of the chamber, the shape of the mold corresponding to the external shape of the panel to be obtained. A first set of fixed, parallel, perforated metal tubes (5), inside the mold (4), possesses lateral holes (9) for the passage of a second set of perforated or non-perforated metal tubes (10) firmly fixed to a movable external support (11), passing through one of the short walls of the steam chamber (1) and capable of moving perpendicular to the tubes (5) of the first set, passing through the latter. The chamber (1) is provided with inlet valves (13) for the partially expanded synthetic material, an inlet (14) for steam and an inlet (15) for a cooling fluid.

Abstract: Crosslinkable polymers and co-polymers are treated with boric acid, boric acid anhydride, or mixtures thereof prior to crosslinking with free radical organic peroxide initiators in the presence of oxygen. This pre-treatment prevents stickiness of the surface of the crosslinked polymer making the crosslinked polymer more commercially acceptable.

Abstract: Method and apparatus of making socketed pipe-fittings of synthetic plastics material by injection moulding. Prior to starting the injection moulding process a sealing ring is held in somewhat pinched condition with reduced outer diameter at the level of means to be formed on the socket for receiving the sealing ring. During the injection moulding process the sealing ring is held in this condition and is isolated from the moulding cavity. After sufficient, but incomplete cooling of the socket formed, the sealing ring receiving means are partially and temporarily deformed, and the sealing ring is released to enable it to spring into the partially deformed ring receiving means. Thereafter the ring receiving means reassume their original form, thereby firmly gripping the sealing ring.

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 vulcanizing or the like, are produced in a dual purpose apparatus that simultaneously moulds two separate parts and bonds together two previously moulded parts.

Abstract: A prefabricated control element for high voltage apparatus, which can be slipped onto a bare or an insulated conductor, especially for fittings for high voltage cables, in the form of an electrical insulator, in which conductive layers which follow each other in the axial direction of the conductor are embedded, engaging each other, having the form of funnels and likewise consisting of elastic conductive material and having a wall thickness of 0.005 to 0.5 mm.In the manufacture of the control element, individual parts of the insulator are joined together with a material bond by means of the conductive layers which are made of a dispersion of carbon black enriched polymer.

Abstract: An improved method for producing a ceramic resistor is disclosed. The method comprises the steps of charging ceramic batch into a longitudinally extending die, pressing the batch in the die between opposing plungers, removing one plunger from the die, ejecting the blank by moving the other plunger relative to the blank and firing the blank. The improvement constitutes imparting rotational motion to the removable plunger as applied pressure thereon is being released to remove the plunger from the die, whereby the surface of the plunger in contact with the blank separates therefrom without sticking.

Abstract: For over-molding a thermo-plastic material on a connector, the connector is, at the outlet of the machine having crimped the connector on a conductor, carried into a gripper maintaining the connector when introducting a core mounted on a conveyor. The connector is then carried into an injection mold from which it is extracted before complete cooling, to be carried to a cooling station comprising a mold similar to that of the injection mold but being at a lower temperature.

Abstract: Novel resin products produced by reacting unique polycyclic, aromatic, polycarboxylic acid products with low molecular weight polyols display satisfactory toughness properties and good Barcol hardness values. The process for preparing these novel resin products first involves preparing an intimate, finely divided mixture comprising the acid product derived from the nitric acid oxidation of naturally occurring solid carbonaceous material, a roughly equivalent amount of a liquid polyol, and a suitable acid catalyst. The mixture is then subjected to a precure step which involves heating at temperatures between 80.degree. and 150.degree. C. for from about fifteen minutes to about four hours. The precured mixture may thereafter be subjected to suitable molding conditions at a temperature below about 220.degree. C.

Abstract: Mold elements, generally composed of clay, are removed from the mold by pressing the body upwardly with a wedging action.

Abstract: Method and apparatus for pre-casting box-like reinforced concrete modules on assembly line. Apparatus includes pair of movable interior forms for defining the interior surfaces of side walls and ceilings whereby one interior mould at a time can be removed when concrete is in semi-cured condition. Method includes casting floor with short upstanding side wall portion to serve as guide for interior forms when moving forms onto floor slab. Method also includes use of integral multiples of four serially arranged casting beds on which various procedures for forming modules proceed simultaneously and progressively.

Abstract: Method for making a refractory valve is disclosed. The sliding gate valve slide plate in a can has an integral collector nozzle and is formed as two conjoined refractory concrete mouldings with a cup or trough shaped metal foil lying in the joint therebetween. The foil is oxidisable in service to form a bond between the concretes. The concretes may be of different formulations, and the moulding with which molten metal makes contact is preferably the more resistant to the rigorous environment presented by flowing molten metal.The slide plate is cast in two steps using the shaped foil and the can as respective lost mould members which coact with a planar polished surface to produce a cast slide plate needing effectively no finish grinding before installation in a valve.

Abstract: A method and mould for moulding material requiring heat treatment for setting or curing, e.g., for making ophthalmic lenses. The mould comprises an annular gasket and two opposed die members which together define a moulding cavity. One of the die members is made in part of a fusible material, e.g. paraffin wax, which defines its moulding surface. After filling the mould the moulding material is subjected to heat treatment. The drop point or softening point of the fusible material falls within the range of temperatures of heat treatment so that in the course of such heat treatment of fusible material effectively releases the moulded material. This relieves stresses which would otherwise develop due to shrinking of the moulded material.

Abstract: Concrete building panels include a decorative embossed pattern on an outer surface. A plurality of concrete reinforcing ribs are disposed along an inner surface of the concrete building panels. Nailing strips are anchored into tips of the respective concrete reinforcing ribs. A method for making the building panels include a step of placing anchored nailing strips into tapered rib sections of a horizontal fiberglass mold is disclosed wherein reinforcing bars and mesh and moist concrete are placed into the mold and allowed to cure until the exposed upper surface of the moist concrete is plastically deformable. The horizontal mold is passed beneath a rotating embossing roller having a cylindrical embossing pattern thereon. The plastically deformable concrete contacts the embossing pattern, producing a complementary pattern on the concrete surface. The embossed concrete is cured in the mold to produce the building panel. The concrete building panel is then separated from the mold.

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: Apparatus and method for molding generally cubical building modules of concrete, the apparatus comprising both internal and external movably mounted molding components and preferably including mechanisms for advancing the components into molding position and for withdrawing the components from the molding position upon completion of the molding of a module. The method involves the use of such molding components and contemplates certain sequences in the advancement and withdrawal of the molding components for different portions of the modules. The outside mold parts comprise superimposed horizontal strips and alternative screw jack and reciprocating rod devices are provided for mounting and sequentially advancing and withdrawing the outside mold strips. Provision is further made for subjecting the concrete cast in the side walls to vibration.

Abstract: Apparatus and method for molding generally cubical building modules of concrete, the apparatus comprising both internal and external movable mounted molding components and preferably including mechanisms for advancing the components into molding positions and for withdrawing the components from the molding position upon completion of the molding of a module. The method involves the use of such molding components and contemplates certain sequences in the advancement and withdrawal of the molding components for different portions of the modules.

Abstract: The invention relates to a method and apparatus for manufacturing bands of elastomeric or thermosetting material of the type used in making impervious seals and gaskets. The process consists in molding or injecting at ambient temperature the elastomeric or thermosetting material in the viscous state into a molding cavity on a support which, compared to the material being deposited, has an adherence that is greater than that of the molding cavity. Subsequently, the deposited material is vulcanized or polymerized into the desired band configuration.

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: An improved molding machine which overcomes the tendency of concrete members molded therein to become end distorted upon initial discharge movement relative to the mold cavities in which they are formed. The front set of plates which close that end of the multi-cavity mold box proximal to the discharge end of the machine are maintained in contact with the faces of the concrete member adjacent thereto at least during the initial breakaway of the concrete members from the sides of the mold. The molded members are forced out of the mold box by a hydraulic ram acting upon a second set of end plates which act to close the rear end of the mold cavities. Once the concrete members are smoothly moving relative to the mold cavities, the front set of end plates are withdrawn to enable the members to be completely discharged from the mold. A bleed orifice is placed in the return line of the hydraulic cylinder controlling the retraction action of the front end plates so that the two sets of end plates move in unison.

Abstract: A method for the production of curved tubular elastomeric articles such as hose is described which uses a rigid, deformable mandrel. An uncured hose assembly is placed on the mandrel, and the assembly, including the mandrel, is deformed to a preselected curvilinear configuration, and then partially cured. The partially cured hose is straightened and the mandrel is removed. The partially cured hose is then returned to the curing chamber to complete the curing.

Abstract: A novel method is disclosed for the manufacture of a hollow graphite-epoxy structural part with high composite density and using tooling that eliminates the necessity of autoclave and similar high external pressure curing equipment. The method of manufacture in part involves the use of a rigid hollow frangible mandrel and superimposed flexible pressure bag element which subsequently develops high internal pressures in the part being processed during composite curing stages.

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: Method and apparatus for precasting concrete products wherein dry mix is deposited in casting cavities defined by mating upper and base form sections, vibrated and/or pressure compacted, and the upper form section removed immediately for curing of a free standing green cast product. A single upper form section cooperates with a number of base sections and the latter are used to transport the green cast products for curing. Automatically separable base section parts may also be employed for the transport of cured products. Forms are adapted for fork lift handling and include high intensity vibrators, sight openings for ascertaining a cavity full condition, closure plates for fill openings, pressure applying and finishing devices, and sectionalized construction for various size products. Casting machine includes mix delivery apparatus and form handling apparatus for upper and base form sections for automated casting and transfer of green cast products for curing.

Abstract: In a method of casting in a horizontal mould a hollow, reinforced tapering concrete post having a thin wall and particularly a length exceeding 10 to 15 m, there is placed in the mould a tapering reinforcing cage or basket in which a core, e.g. a steel core, is inserted to form a substantially annular mould chamber. Said mould chamber is closed with the exception of an upper filling slot. A readily pourable concrete mass is charged to the mould from above through said filling slot. The mould is then vibrated without being rotated such that concrete fills the annular mould chamber. Hardening of the concrete is accelerated by heating, and the core is withdrawn from the formed post before the concrete has completely hardened. The finished post is then removed from the mould.

Abstract: A molding station having packer heads is positioned between a pair of stripping stations having ejectors and a mold box having first and second mold sections is movable between first and second positions with the ejectors at the one stripping station registering with the one mold section and the packer heads registering with the other mold section and at the second position the ejectors at the other stripping station registering with the other mold section and the packer heads registering with the first mold section. The completed molded product is ejected as the mold box is raised and the molded product is formed as the mold box is lowered. The mold box is raised and lowered between top and bottom table halves and when in the lowered position is movable between the first and second positions on rails having legs adapted to engage a stationary support when the lower table half is lowered a predetermined distance.

Abstract: Undercut tubular synthetic plastic articles, such as fittings, are formed in the mold cavity of an injection molding machine on a two-piece core a tubular component of which is surrounded by the undercut portion of the article and a first smaller-diameter portion at one side of the undercut portion. A cylindrical component of the core slidably guides the tubular component and is surrounded by a second smaller-diameter portion of the article at the other side of the undercut portion.