Abstract: A resin article is made between an outer concave mold part and an inner convex mold part that can fit together so that respective surfaces form a substantially closed mold cavity. This is done by first lining the surface of the outer mold part with a liner sheet and then fitting the lined outer mold part to the inner mold part to form the substantially closed mold cavity. A portion of the surface of the inner mold part is positioned to form a pocket open inward into the cavity and this pocket is filled with a mass of fluent synthetic resin. The surface portion is then pressed inward while the parts are fitted together and without otherwise relatively moving the mold parts to force the resin mass from the pocket into the cavity until the inner-part surface portion lies substantially flush with the rest of the inner-part surface.

Abstract: A vessel for duplicating dental models has at least two mold halves which can be clamped together. The mold halves have elements for mutually centering and for securing the model to be duplicated, for example, a tooth stump or the like. The vessel further includes an intake funnel each for pouring in liquid silicone and refractory casting material. A foil insert is provided in the plane of separation of the two mold halves when the vessel is closed. The foil insert has a thickness which corresponds in size to the setting expansion of the refractory casting material. The model to be duplicated is located in the center axis of the vessel and extends approximately by half its length through the foil insert and is held in position by the foil insert.

Abstract: A device for simultaneously encapsulating a number of electronic components is provided with a locking mechanism in which a molding cycle has two phases, i.e. in a first transfer phase, during which plungers for injecting molten resin into encapsulation cavities are locked and driven at a high, controlled speed, followed by a second curing phase, during which the plungers are spring-loaded, unlocked, and stationary, and are subject to the same maximum pressure of the transfer phase. In this way damage to the products is prevented, while the cycle time is reduced and the products obtained have an even and smooth appearance.

Abstract: In a method of making an ornament, a metal ornament body having an internal groove opening at one end to an end edge of the metal ornament body and at an opposite end to front and rear surfaces of the metal ornament body is held between two relatively movable mold members while the one end of the internal groove is connected to a gate of the mold members and the opposite end of the internal groove communicates with mold cavities in the mold members. Then, a melted synthetic resin material is injected into the mold cavities through the gate and the internal groove. The gate mark is not formed on the outside surface of an ornamental member molded of synthetic resin but left on the end edge of the metal ornament body. The gate mark thus formed is normally hidden from view and does not deteriorate the aesthetical appearance of the ornament.

Abstract: A highly efficient and highly controllable method and an apparatus for core-back injection molding of multi-component plastic products. Core-back injection molding makes possible the injection of a first plastic material into a mold cavity, followed by retracting a barrier means, in order to enable injection of a second plastic material without separating any mold halves. The present invention enables very efficient injection molding because both injection units may be operated at the time, and the present invention enables very controlled injection because it is possible to inject only one half of the cavities by a specific injection unit at the same time, or even only one quarter of the cavities by a specific injection unit at the same time. The injection molding apparatus includes a first injection unit, a second injection unit, a right adjustable mold cavity with a first moveable barring means, a left adjustable mold cavity with a second moveable barring means, and a common standard clamping unit.

Abstract: An improved slipform for use in a machine for casting hollow core concrete planks includes at least one angled baffle plate in the core material receiving ports so as to deflect the core material from directly impacting the lower concrete. This lessens the possibility of tears and holes in the lower layer caused by the core material.

Abstract: High voltage insulator is produced by inserting a fiber reinforced core into the mold and filling the mold from the bottom through a casting pipe line attached to a tank for a ready to use liquid silicon rubber mixture, and transferred to the heated mold where crosslinking of the mixture occurs.

Abstract: An automatic continuously cycleable molding system wherein a plurality of mold sets are transported in predetermined timed cycles through a series of work stations wherein the various molding, curing and workpiece handling operations are accomplished, and wherein the mold sets are recirculatingly moved through the system for repeated usage.

Abstract: A climbing rung for anchoring to the wall of a manhole shaft. The climbing rung has a generally U-shaped core of two parallel legs spaced apart by a central tread. Each leg is sheathed in a pre-formed protective sleeve, closed at one end, by inserting the leg into the mouth of the sleeve. An injection moulded protective coating is bonded to the core of the tread and the core of each leg, extending to proximate the mouth of each pre-formed sleeve when a leg is sheathed therein, forming a sealing interface proximate the annular lip circumferentially defining the mouth of each sleeve. A method includes gripping the climbing rung only proximate the pre-formed protective sleeves when both legs are sheathed therein, so as to permit positioning the core of the tread and legs, extending only to proximate the mouth of each pre-formed protective sleeve, in an injection moulded cavity radially spaced equidistant the surface of the mould cavity.

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 improved molded closure cap is described which has a softer sealing portion and a relatively hard closure engaging portion. The cap is molded using two differing plastics where the container engaging portion is molded of a softer seal-forming plastic and the remaining portion or shell is molded of a harder plastic. The novel molding apparatus and method employ plunger or die movement to facilitate a successive molding of the soft and hard cap portions without changing the molding plunger or die.

Abstract: A device including an injection mold for the production of a boot from thermoplastic material, the boot having a boot shank of a color different from that of the shank flange and the outer sole, both of which have the same color, by molding the shank and then in a subsequent and simultaneous step, molding the upper shank flange and the outer sole onto the molded shank. The injection mold includes a last for fitting with a textile sock, a base stemple having a deadhead borehole for injection molding the outer sole, another base stemple having a deadhead borehole for molding the shank, and two sidepieces. The sidepieces having sliding elements and, in their closed position for molding the upper shank flange, accommodate at least one deadhead borehole which communicates with the deadhead borehole of the base stemple for the outer sole. The sliding elements cover the cavity for the upper shaft flange during the molding of the shaft and release it for the molding of the upper shank flange.

Abstract: A composite molded article and a method of fabricating such an article is disclosed, which is especially well-suited for forming one-piece interior vehicle panels, by way of a single molding operation, wherein the one-piece interior panel can be easily installed as a unit within the vehicle. In the fabrication of the one-piece molded composite article, a deformable sheet material, such as vinyl, is positioned on a female molding surface and drawn into conformity with the female molding surface of the mold cavity, either with or without preheating or vacuum forming. The mold apparatus is closed and a first moldable material is introduced into the mold assembly, with certain predetermined portions thereof being blocked off. Subsequently, a second moldable material is introduced at least into the predetermined areas previously blocked off during the introduction of the first moldable material.

Abstract: A system for molding elongated ribbon-like products from thermoplastic materials utilizing a plurality of molds which are moved in tandem along a production line. As the molds are moved along the line at successive stations they are, while open, thermally adjusted to a temperature suitable for forming the product to be molded and then a ribbon of plastic is deposited in them. They are then closed and cooled and reopened and the molded product removed. The system utilizes only enough molding pressure to assure distribution of the plastic to all parts of the mold cavity and shaping of the molded product to the geometric design of the mold. The system includes a transfer means for the molds which returns the emptied molds for recycling through the molding process.

Abstract: A polyurethane RIM method has two mixheads. Reactants are brought to each mixhead and are supplied as separate streams to two spaced cavities in a mold having a pre-formed porous mat separating the two cavities. One stream contains an isocyanate, polyol, chain extender and crosslinker selected to have a very low viscosity and which reacts to produce a high modulus armature or load bearing member. The other stream contains a polyol and isocyanate with additives that have relatively high viscosity to produce a semi-rigid polyurethane foam. At each mixhead the proportions of ingredients are controlled to give a desired isocyanate index to control the flex modulus and other properties of the loading bearing member and foam molded components of the product. The low viscosity material penetrates the porous mat to reinforce it and the porosity of the mat prevents the high viscosity material from entering the armature cavity so as to reduce the load capacity of the finished product.

Abstract: Molds for making composite bodies having at least three sections which are united along generally aligned intersections wherein the molds include two slideable molding blocks having molding cavities therein which are movably oriented with respect to a stationary molding cavity and wherein separate injectors are utilized to fill each of the cavities depending upon the positioning of such cavities.

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

Abstract: For producing a plastic film having a plastic fastener, with male and female interlockable profiles, and accessory strips, such as ribs and strips, in preparation of a reclosable plastic bag, there is provided a first forming die which extrudes the accessory strips, a separate second forming die which extrudes the fastener, a pair of nip rolls for press-bonding the accessory strips onto the surface of the film being fed in the vicinity of the first forming die, and a bonding roll for receiving the film with press-bonded accessory strips and the fastener from the second forming die placed onto the film surface such that the fastener is bonded to the surface of the film at the bonding roll by virtue of heat.

Abstract: An apparatus for producing seat or backrest cushions from plastic foam in which the hardness of the cushion varies in different regions of the cushion. The components for making the different plastic foam mixture are first mixed in a mixing head, and then, depending on the desired hardness of the respective parts of the cushion, the respective mixture is then passed from the mixing head into a mold corresponding to the configuration of the cushion to be produced. The apparatus comprises a mixing head which is stationary in relation to the mold during operation of the process, and communicates with a distributor which opens into the mold and which deflects the respective foam mixture issuing from the mixing head into the designated regions of the mold.

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 activity toy with which a child may create needle craft like textured designs using plastic or amorphous solid substances. In order to simulate the strands or nubs that create the textured design in neddle crafts a stand supported on a surface holds a screen having mesh spaces extending between the opposed sides of the screen. The stands hold the screen spaced from the surface with one side of the screen facing the child. An extruder for the plastic substance is positioned adjacent the side of the screen away from the child and moved under the screen to force the substance through the mesh spaces to create the needle craft like texture. The extrusion opening is a larger than the mesh spaces so that a mat or backing retains the textured design on the screen. To facilitate the creation of aesthetically pleasing designs, preprinted patterns or outlines are provided on the screen.

Abstract: A headpiece for a collapsible tube is a unitary member made up of two different plastics, each plastic providing a different property for the headpiece. The headpiece is formed by extruding on top of one another a first torus like annulus of a first plastic and a second torus like annulus of a second plastic. The two plastic annuli are simultaneously molded to form the headpiece. One plastic forms, primarily, the outer portion of the headpiece and the other plastic forms, primarily, the inner portion of the headpiece.The machine for molding the plastic head includes a work table rotatably indexed from station to station at which various operations are performed. The mandrel which holds the cylindrical body, to which the head is molded, is movable from an inboard position to an outboard position so that operations can be performed relative to it. The molding operation is performed at the inboard position. The loading, extruding, capping and ejection operations are performed at the outboard position.

Abstract: A continuous and automatic process for molding chocolate blocks each having an ornamental relief pattern of one color and a body portion of different color carrying the relief pattern is provided. Also, there is provided apparatus for continuously and automatically producing such ornamental chocolate blocks. A first chocolate material for forming the ornamental relief pattern is cast into a first mold and scraped to scrape off the excess chocolate material. A second mold is then placed on the first mold and a second chocolate material for forming the body portion is cast into through-openings of the second mold. The second chocolate material inevitably oozing into the interface between the first and second molds adheres only onto a rough surface portion formed around and surrounding the through-openings of the second mold without the second chocolate material adhering onto the first mold. It is thus not necessary to remove the oozing chocolate material from the first mold.

Abstract: A machine for casting concrete panels. The machine disclosed casts hollow core concrete panels in a single casting operation utilizing a slipform technique to fill cores with core material which can be dumped from the core after curing of the concrete has been accomplished. Vibration of the slipform during casting facilitates free flow of concrete around the slipform and core material extruded from slipforms. The slipfom has a closed front portion which is tapered to a reduced cross section. The machine utilizes a casting pallet employing improved side form cleaning apparatus. The machine also includes improved finishing screeds for applying decorative three-dimensional finishes on the top surface of cast panels.

Abstract: An automatic foam dispensing system is described for forming shock-absorbing members of synthetic foamed material into predetermined shapes at pre-selected locations inside a container for the cushioning of articles to be provided therein. The foam dispensing system is generally constructed from a dispensing booth having a plurality of synthetic foam dispensing apparatus provided thereat and a plurality of mold assembles adapted for movement along a track to and from the dispensing booth.

Abstract: A machine for casting concrete panels. The machine disclosed casts hollow core concrete panels in a single casting operation utilizing a slipform technique to fill cores with core material which can be dumped from the core after curing of the concrete has been accomplished. Vibration of the slipform during casting facilitates free flow of concrete around the slipform and core material extruded from slipforms. The slipform has a closed front portion which is tapered to a reduced cross section. The machine utilizes a casting pallet employing improved side form cleaning apparatus. The machine also includes improved finishing screeds for applying decorative three-dimensional finishes on the top surface of cast panels.

Abstract: A polygonally shaped, multifaceted rotary scanner comprising a plurality of optically flat, reflective surfaces on the facets. The reflective surfaces are integrally bonded to a multifaceted, polygonal base at precise angles to the axis of rotation by a replication technique in which each optically flat reflective surface is produced on the surface of a flat master preform, and the flat master preform is then accurately located in position at the precise angle relative to the base by contact with upper and lower facets of a master multifaceted polygonal fixture. The flat reflective surface is then adhesively bonded to the corresponding facet of the polygonal base (while the polygonal base is arranged concentrically between the upper and lower facets of the fixture) by the application of a small quantity of a liquid adhesive to the surface of the facet of the polygonal base. On hardening, the adhesive bonds the reflective layer of each master preform to the appropriate facet of the polygonal base.

Abstract: Plastic molding apparatus is disclosed for forming a series of molded connector bodies along a molded strip segment. By repeating the molding cycle, an additional strip segment is simultaneously molded and joined to a previously made strip segment, so that repeated cycling of the molding machine provides a molded continuous strip interconnecting a series of molded bodies.

Abstract: A method and apparatus for applying paste to battery grids wherein the paste is circulated in a primary circuit incorporating an open reservoir wherein the paste is relieved of all pumping pressure and portion of the paste is diverted from the primary circuit into a secondary circuit for delivery to a nozzle which may be selectively opened and closed to deliver paste to the grid, the secondary circuit also incorporates the open reservoir.

Abstract: The invention provides a process for the injection molding of treads on a tire carcass which comprises feeding an elastomeric composition for molding the tire's tread to a plurality of equalization spaces symmetrically arranged with respect to the injection cavity of the mold where the tread is formed, the mix moving to the injection cavity from each of the spaces through a plurality of injection passages, the mix being fed to each of the spaces through at least one feeding passage and the ratio between average sliding gradients .gamma..sub.i of the injection passages and gradients .gamma..sub.a of the feeding passages being not lower than 8.

Abstract: Molding apparatus for laminated foam-body panels, comprising first and second walls defining a molding cavity therebetween, the first wall including means for heating the foam during molding and the second wall comprising hingeably mounted access doors, adjustable holding and shaping means for said panels, disposed within the cavity and at least two of which are perpendicularly adjacent, means for simultaneously positioning each of the holding and shaping means, first and second movable locking means for the holding and extrusion means and for the access doors respectively, the first locking means being automatically actuated in response to the positioning means, means for simultaneously actuating and disengaging the first and second locking means, and means for filling the cavity with unmolded foam material.

Abstract: Apparatus for manufacturing an at least partly tubular body, provided with an elastic sealing ring accomodated in an internal groove in said member. In a moulding cavity of a mould first the tubular member is formed of plastic synthetic material, thereafter an annular cavity is arranged in the mould adjacent the outer surface of the body and subsequently a pressurized thermoplastic deformable material is brought against the inner surface of said body which material is an elastomer at the temperature of its normal use. Thereby the body is forced into the annular cavity and is simultaneously forming the internal groove, which is filled with elastomeric material.

Abstract: A process for injection molding a crown of a vehicle tire from one composition and the sidewalls from a different composition involves the steps of shaping the reinforcing structure in the mold, injecting a first composition over one side of the reinforcing structure to form a crown with a tread and injecting a second composition to form the sidewalls with an interface within the proximity of the edges of the reinforcing structure. In a preferred embodiment, the tire has the configuration of the one disclosed in U.S. Pat. No. 3,805,868. The annular reinforcing structure is shaped to be generally convex but concave towards the tread along its edges.

Abstract: A confectionery moulding machine comprising an endless mould conveyor which traverses moulds in continuous procession in an upper run in which the cavities in the moulds face upwardly and in a lower run in which the mould cavities face downwardly, a depositor for depositing liquid confectionery into the moulds in succession as they travel along the upper run, a conveyor band which travels continuously beneath the lower run of the mould conveyor, and a demoulding unit for discharging the fillings of the cavities of each mould in succession onto the conveyor band, the moulds having projections which contact the upper surface of the band on the lower run of the mould conveyor and project from the downwardly facing surfaces of the moulds on the lower run by an amount less than the depth of the mould cavities and constrain the band to run at the same speed as the mould conveyor.

Abstract: Apparatus for the production of hollow confections provided with center fillings including conveyor means with centrifugal molds mounted thereon, each mold being fitted with one member of a clutch which moves over a rotary drive comprising the other member of the clutch so that the two clutch members can be brought briefly into engagement for rotating the molds, the two clutch members being displaceable in the conveying direction and being adapted to pull themselves into axial alignment when they engage.

Abstract: An apparatus is provided for molding composite articles by first rotationally molding a shell-like body with a reinforcing member or frame extending through the body and supported by the walls of a mold. The hollow shell is formed of a liquid or powdered resin or other suitable material disposed in the mold per se or containing reinforcing elements which become encapsulated within the molding material. A second molding material may be injected into the hollow shell to partly or completely fill the volume interior thereof. The second material may comprise a resin containing a blowing agent which causes the resin to expand and form a cellular mass filling the hollow body or forming a shell thereagainst as the mold is rotated. The filler material may be introduced through one or more of the reinforcing members disposed within or across the mold cavity.

Abstract: A machine for making a confection comprising a conveyor for moving containers through a plurality of stations, an ice depositing device at one of the stations for depositing ice fragments in the containers, a compactor at a second station for compacting the ice in the containers, and a rotor for shaping the ice in the containers.

Abstract: To form a laminated plastic article having at least one thermoset layer, a first resin is injected into a mold from a first nozzle and solidified as usual. Then the dies are separated by a predetermined distance to create an additional cavity for a second resin layer on the solidified resin and at the same time provide a fluid passage, which connects the cavity to a second nozzle and is defined and sealed by opposite faces of the dies at their particularly shaped portions. The passage is unsealed by thoroughly separating the dies after injection of a second resin therethrough and solidification of the resin.

Abstract: Apparatus for moulding confectionery, comprising a series of moulds, each of which is divided into a fixed half and a hinged half which is normally aligned with the fixed half, a conveyor for traversing the moulds in sequence past a filling station, through a cooling zone to a discharge station and back to the filling station, a depositor at the filling station which is arranged to deposit different materials into moulding cavities in each half of each mould, mechanism disposed at a folding station beyond the cooling zone for folding the hinged half of each mould about its hinge against the fixed half and effecting deposition of the contents of the moulding cavities thereof into the moulding cavities of the fixed half, mechanism disposed at a following unfolding station for returning the folded hinged half of each mould into alignment with its fixed half, and means for inverting the moulds prior to arrival at the discharge station and turning them right way up during their return to the filling station.