Abstract: A compression molding apparatus includes a rotatable supporting member and circumferentially spaced molds mounted on the rotatable supporting member. The molds are conveyed successively through a plastic material feed zone, a compression molding zone and a discharge zone by the rotation of the rotatable supporting member. A plastic material in a heat softened state is fed into the molds which are disposed within the plastic material feed zone. Each of the molds include a first mold portion and a second mold portion which defines a mold cavity. The mold is opened and closed by moving the mold portions relative to each other in a predetermined direction. A conduit hole extending from the mold cavity is formed in the second mold portion. Each mold includes a compression rod which slides in the conduit hole. The conduit hole has a plastic receiving portion opened frontwardly in the rotating direction of the rotatable supporting member.

Abstract: Optimum sprue design requires suitably large cross-sectional area of the open aperture during mold filling and packing yet fast heat removal from the molten sprue during solidification. This is accomplished by a "hollow" sprue configuration, wherein an enlarged female sprue bushing cavity of large draft angles is axially aligned with a "spreader die" type of male member having a generally conical-tipped or parabolic-tipped torpedo shape, creating a cross-sectional open aperture consisting of an annular ring along at least partway up from the base to the tip. Both male and female may be fitted with internal mass-transport cooling. Since the cooling time of the sprue is directly proportional to the wall thickness of the molten plastic sprue being formed, and cooling time is further inversely proportional to the plastic/mold surface area, the resulting "hollow sprue" provides superior cooling without impaired fill and pack function.

Abstract: A method of preparing window glass provided with a gasket at a peripheral portion of a glass sheet for a window includes placing a glass sheet in a shaping mold which has two mold parts to provide an inner cavity in which resilient sealing members are attached respectively to the two mold parts so as to come in contact with surfaces of the glass sheet so that a gasket forming cavity is formed at a peripheral area of the glass sheet by the cooperation of the inner cavity of the shaping mold, the resilient sealing members and the glass sheet. The resilient sealing member is then pushed to the contacting surface constituted by the resilient sealing member and a part of the shaping mold in the inner cavity via a pushing means after the assembling of the shaping mold and the glass sheet. A gasket material is then injected into the gasket forming cavity to form a gasket.

Abstract: Three-part vertical stack-up mold apparatus for molding a composite styled wheel wherein the middle mold part is metal disc and rim subassembly operable as metal street wheel when a pneumatic tire is mounted on said rim. The lower mold part has a mold cavity surface to define an ornamental configuration for the outboard face of a plastic body of the composite wheel. An upper mold part urges the wheel into sealing engagement with the lower mold part. The lower mold part includes cores adapted for individual registry with disc air vent openings so as to protrude therethrough into the mold cavity in the closed condition of the mold. The upper mold part includes an expansible lid seal juxtaposed in mold cavity sealing relation to the disc inboard face and the cores in the mold-closed condition.

Abstract: A manufacturing method for a molded resin article includes an injection step of injecting a resin molding material into a mold, a compression step of compressing a prescribed portion of the resin molding material, a cooling step of solidifying the resin molding material by cooling while maintaining pressure on the prescribed portion, and a removal step of removing the resulting molded resin article from the mold. The compression prevents the formation of voids in the compressed portion and increases the dielectric strength thereof. In a preferred embodiment, the molded article is a distributor rotor for an internal combustion engine.

Abstract: Apparatus for manufacturing plastic encapsulated electronic semiconductor devices is disclosed in which a support pad is firmly fixed by slidable means and also by mold halves in molding operation. Slidable means is moved outward of a cavity when it is filled with the plastic encapsulating material to the half volume. Spaces, which are formed after movement of slidable means, are filled with the plastic encapsulating material directly poured through a gate. The encapsulated semiconductor devices indicate excellent thermal radiation and dielectric strength characteristics without formation of voids or unfilled portions in the plastic.

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: A method for injection molding a hollow, plastic product having an end wall and a cylindrical or approximately cylindrical side wall, wherein the end wall includes a fringe region bordering the end wall. A system for performing the method includes a mold-cavity-forming combination of a core section and a cavity section, wherein the core section includes a protractable and retractable ram-shaped contact element, with the end of the contact element that faces the mold cavity including a contact surface that contacts at least a significant part of the fringe region of the end-wall-defining portion of the cavity section. Both the end-wall defining portion and the side-wall defining portion of the core section consist of the contact element.

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

Abstract: Method of manufacturing a tube coupling body in a plastics material using injection moulding tooling. The body is formed with a cylindrical bore having enlarged end portions in a mould body and using removable cores. The cores form both the internal bore of the mould body and also end parts of the mould body so that once the cores are removed, end parts of the coupling body are revealed in the mould. While the end parts are still hot from the initial moulding operation, forming dies having tapering end cavities are pressed over the end parts of the moulding to form the end parts of the moulding with both external and corresponding internal tapered surfaces. The tapered internal surfaces of the end parts thus formed provide tapered cam surfaces for engaging the resilient arms of collets to be inserted in the coupling body to receive and lock tubes in the coupling body.

Abstract: Molding a foamed product is carried out by using a front and a rear mold for molding a front and a rear portion of the foamed product and a core interposed between the front and rear molds. The front and rear molds are closed at a moment when a lapse of time arrives at 30%-100% of a rise time of the foaming stock solution later applied. Thereafter the closed molds are maintained in a position where an angle of the closed molds relative to a horizontal plane is within a range between 90.degree. and an angle more than 0.degree.. The front and rear molds are pivotally connected to each other with their one ends by means of a pivot shaft. The core is pivotally supported with its one end by a shaft arranged in parallel to the pivot shaft. The core is formed with a through-hole and said rear mold is provided with a protrusion to be hermetically fitted in the through-hole of the core.

Abstract: An injection molding apparatus produces a one-piece molded end closure has a pull ring spaced from a main panel, which has an annular flange extending therefrom and may have score lines. The pull ring is connected to the main panel by a tenon. The apparatus includes a slidable member disposed in a first passage in a core having a cavity surrouding a portion of the first passage. The core and the slidable member have end surfaces spaced from an end surface of a cavity insert to form a recess therebetween into which molten plastic is injected to form the main panel. The core has a second passage communicating the recess with the cavity in the core so that the molten plastic flows into the cavity to form the pull ring with the tenon being formed in the second passage in the core.

Abstract: A compression molding apparatus for forming a plastic grip ring and simultaneously linking it integrally to a linking protruding piece of a container closure body. The apparatus includes a mold composed of a first mold portion and a second mold portion adapted to be opened or closed by being moved relative to each other in a predetermined direction. The first mold portion has an accommodating space for receiving the closure body and a first mold cavity extending in a ring-like shape. At least the free end portion of the linking protruding piece of the closure body to be received in the accommodating space is projected into the first mold cavity. The second mold portion has a main part consisting of a second mold cavity extending in a ring-like shape and a conduit hole extending in said predetermining direction from the second mold cavity and a compression rod to be slidably inserted into the conduit hole.

Abstract: An injection-molded connector for single-mode optical fibers includes two mating plugs having aligned fiber-receiving holes. To keep transmission losses in the connector at an acceptable level, the eccentricity of each hole relative to its plug profile must be maintained within a fraction of a micron. The mold utilized to form the plugs includes a dual-eccentric-cam adjustment mechanism that comprises nested conically shaped cams. In a method for fabricating such plugs, rotation of the cams serves to move a part of the mold that positions a hole-forming pin. By rotating this mechanism, the eccentricity of the fiber hole relative to the profile of the molded plug can be established and maintained within the required precision.

Abstract: Low cost medical micro pipette tips for difficult to reach places, and related methods. The leading or distal portion of the micro pipette tips are materially elongated and ultra thin. This accommodates placement of the distal influent port, for receiving expensive biological extracts, in hard to reach places.

Abstract: The method and apparatus includes an injection molding assembly including a mold, a core and a mold cavity therebetween wherein said mold cavity has a base, a peripheral area of said base and a central area of said base, at least two injection gates for injecting plastic material into said mold cavity situated adjacent the peripheral area of the mold cavity in a substantially balanced fashion, a source for injecting plastic material through the injection gates whereby molten plastic advances from the injection gates in the mold cavity to force gas in advance of the plastic and to stabilize the core, and means for venting the gas from the mold cavity.

Abstract: An injection molding machine for the making of barrels of syringes has first and second mold sections which have confronting surfaces and one of which is movable between operative and retracted positions in which the surfaces respectively abut and are spaced apart from each other. The first section has cylindrical bores each of which is open at the respective surface and extends to an end wall adjacent a nozzle with several uniformly distributed orifices which admit heated plasticized material into the bore when the two surfaces abut. The second section has cores each of which extends into a bore in the operative position of the one section to define with the first section a cavity for reception of plasticized material. The first section has coolant-conveying channels which concentrically surround the bores, and the first section has flow restricting ports which connect the discharge ends of the orifices with the respective cavities.

Abstract: An apparatus for injection molding a substrate of an information recording disk in which melted molding material is injected into a mold space after a pair of mold bodies are clamped together. An uneven surface area is provided between a cutting device for cutting the cured molding material at the molding surface and an aperture for supplying the pressurized gas for causing the cured molding material to be released. The flow of pressurized gas through the cut portion of the cured molding material is prevented and force is generated by the pressurized gas causing the cured molding material and a stamper forming the molding surface to release uniformly from the mold.

Abstract: A mold for injection molding including a cylindrical outer mold and a columnar inner mold. The inner mold is provided, on its external circumferential surface, with a large number of tooth-shaped grooves extending in the axial direction thereof, and it is placed inside the outer mold to define an annular cavity between the external circumferential surface of the inner mold and the internal circumferential surface of the outer mold. The outer mold is provided with a plurality of runners extending axially near the internal circumferential surface. The runners are arranged at regular annular intervals along the circumference of the outer mold. Furthermore, slit-shaped gates are formed along the full length of the runners, the gates opening into the internal circumferential surface of the outer mold, in such a way that the inflow of molten molding material flowing from each runner into the cavity is gradually reduced along the runner from the upstream side towards the downstream end.

Abstract: A multipart mold having a resilient retainer engageable with a pin attached to a mold part to hold the mold part in a desired position relative other mold parts.

Abstract: An elastomeric-covered shrouded impeller having a pair of disk-like shrouds enclosing vanes and vane passages which has an improved throat opening having sweeping internal sidewalls is disclosed. A three-piece mold core is utilized to form the vane passage and the sweeping curved throat inlet of the impeller.

Abstract: A mold for manufacturing a skin covered foamed plastic article in which the middle mold is to be attached to the upper mold so as to eliminate the attaching and removing of the middle mold for every manufacturing cycle, without creating a danger of damaging the manufactured skin covered foamed plastic article in taking it out of the mold. The mold includes a middle mold to be attached to the upper mold such that when the upper mold is lifted upwards in order to be disassembled from the lower mold, the middle mold also moves upwards and the skin covered foamed plastic article is taken out from the lower mold by the upper mold and the middle mold; and a protrusion for making a hole in the skin covered foamed plastic article to be manufactured, to be attached to the molding surface of the lower mold, which is freely detachable from the lower mold such that when the upper mold is disassembled from the lower mold, the protrusion is taken off the lower mold along with the skin covered foamed plastic article.

Abstract: A nozzle located in an injection mold for injecting a first medium into a mold cavity containing a second medium. The injection molding has a first bore connected to a first mold surface via a second bore. An outer blowing needle having a first terminal end is located within the first and second bores. An inner blowing needle having a second terminal end is located within the outer blowing needle and has at least one opening near the second terminal end which communicates with the second bore.

Abstract: An injection mold which eliminates defects in the appearance of the molded product such as flow marks formed during the molding operation on those portions of the molded product adjacent molten resin injection gates. A fixed and a movable mold member are provided. An injection port for injecting molten resin into the mold cavity formed by the mold members is formed in the fixed mold member, while an opening communicating the mold cavity with the exterior is formed in the movable mold member at a position opposed to the injection port and spaced therefrom across the mold cavity. An insert member is inserted in the opening having a surface forming part of an inner surface of the mold cavity. The insert member has a size and shape such that gas in the mold cavity is discharged exteriorly from the mold via a fitting gap between said opening and the insert member.

Abstract: A single-piece foam pattern for use in the lost foam casting of a ported cylinder sleeve is formed in a molding tool having a pair of displaceable elements and a removable center core. Ports, of preselected size, shape and location, are defined by movable cores which are extended into position between the displaceable elements and the center core. Following introduction of a molding material, the movable cores are retracted after which the mold elements and center core are separated and the foam pattern is removed.

Abstract: A method and apparatus for effecting an accurate, clsoe tolerance guidance between relative movable male and female mold elements operable at high speed to mold thin wall articles free of the risk of mold damage due to relatively small occurrences of mold misalignment.

Abstract: This invention relates to a secondary molding machine capable of injection molding a handle, a base cup, or the like on a body portion, a bottom portion or the like of a thin-wall hollow container made of synthetic resin. The machine includes a rotational member provided movably up and down on a column on a machine bed, an insert mechanism including a lateral molded-product holding device mounted on the rotational member, a clamping mechanism for connecting an upper clamping plate, which is moved up and down for opening and closing the mold cavities to the rotational member, a secondary mold that is opened and closed up and down having the same first cavity as a hollow molded product and a secondary molding cavity. An air blowing device is connected to a blow core.

Abstract: A die assembly for die casting a propeller structure, such as a wax propeller pattern. The pattern, which is identical in configuration to a cast metal propeller to be produced, includes a generally cylindrical hub having an outwardly flared end and a plurality of blades project outwardly from the hub. The die assembly includes a base plate and a lower core section extends upwardly from the base plate through an opening in a stripper plate, which is mounted for movement toward and away from the base plate. A plurality of die sections are mounted for generally radial sliding movement on the stripper plate from an outer open position to a closed position where they define a die cavity with the core section. The die assembly also includes an upper die unit that is mounted for vertical movement and has a cavity in its lower surface which receives the upper ends of the die sections when in the closed position.

Abstract: A metal mold for injection molding tubular or columnar products is provided in which those portions of matching surfaces of the metal mold members close to end portions of an annular or cylindrical cavity are provided with grooves extending continuously or intermittently so as to surround the cavity's end portions.

Abstract: A mold for manufacturing a skin covered foamed plastic article incorporating a hole, with which it is possible to place the skin cover at a desired position despite of the presence of the hole, without spoiling or damaging the skin cover, such that the skin covered foamed plastic article of a desired shape without any deficiencies such as wrinkles and dents can easily be manufactured.

Abstract: An apparatus for injection molding of plastic lure skirts utilizes an openable mold wherein a conic cavity is formed between a pair of mold plates and a conic insert is selectively advanced to abut the inner surface of the conic cavity. A plurality of grooves are formed in the conic cavity which communicates with a tubular section wherein the soft plastic is introduced such that a body portion and a stranded skirt are formed when plastic is injected between the mold plates and the conic insert. The apparatus may be used for forming double skirted lures or conventional non-skirted lures by internal injection when a stripper bar is used to partially seal the mold distribution channel.

Abstract: Apparatus for moulding a thin-walled article, such as a Petri disk, in which the moulding is effected by injecting from the side of a planar portion of the article. The moulding apparatus has a core piece (10) co-operable with a cavity (12) which together define a space (14) in which the article is to be moulded. At least one of the core (10) or the cavity (12) has a moulding surface (16, 18), corresponding to the planar portion of the finished article, which is non-planar. Preferably, the moulding surface (18) of the cavity (12) has a concave curvature, while the opposing surface (16) of the core (10) inserted therein has a convex curvature. The radius of curvature preferably being larger at the core than at the cavity. The particular configuration allows more material to be supplied to the central area corresponding to the planar portion of the finished article.

Abstract: A method for injection molding a plastic product having a thin-walled area, includes the steps of(a) injecting molten plastic from a gate into a mold cavity defined by and positioned between a first mold part and a second mold part and encompassed by a parting line, for forming the plastic product; wherein the mold parts define a thin cavity region for forming the thin-walled area of the plastic product, and one or more flow channels which are portions of the mold cavity that are thicker than the thin cavity region;(b) directing the injected molten plastic through the one or more flow channels into the thin cavity region, whereby the molten plastic directed from one portion of a flow channel joins with the molten plastic admitted from the gate or directed from another portion of a flow channel; and(c) melding the molten plastic directed from the one portion of a flow channel with the molten plastic admitted from the gate or directed from the other portion of a flow channel in a meld chamber defined by the mol

Abstract: A self aligning mold for injection molding and controlling the dimensions of a hollow plastic product having a rim, a base and a side wall therebetween. The base-forming portion of a first mold part includes a brink that protrudes in a direction toward a second mold part, and the base-forming portion of the second mold part includes a labrum that protrudes in a direction toward the first mold part to define a throttle situated between the brink and the labrum. The throttle has a variable width, which at any throttle position is defined by the distance between the brink and the labrum. The mold cavity gate is located within an area encompassed by the throttle. The throttle width varies when the first and second mold parts are not axially aligned to thereby, during injection, admit more material into the side wall-forming portion of the mold cavity that is the thinnest as a result of the axial misalignment, for the purpose of forcing the first and second mold parts into alignment.

Abstract: A die casting apparatus for casting an article with an internally screw-threaded bore. The die casting apparatus includes a support, a die assembly coupled to the support, a core pin with external threads which are movable into and out of the die assembly, a lead screw for moving the core pin, a fixed bushing threadedly receiving the lead screw therein, a drive assembly, and a control assembly. The drive assembly has a hydraulic motor with an ouptut shaft that is axially arranged relative to the core pin for smoothly driving the core pin and lead screw. The external threads of the core pin and the external thread of the lead screw are identical for driving the core pin and the lead screw at the same rate to avoid damaging the newly formed internal threads of the cast article.

Abstract: One of two mold halves to be clamped is composed of an insert holder, an insert mounted detachably on the insert holder, and a rotary core supported rotatably by the insert and having a threaded portion formed on an outer peripheral surface thereof. When clamping is effected, the rotary core is caused to project into a cavity formed in the other mold half, and moldings are injection molded inside the cavity around the rotary core. The insert holder is provided with a driving source such as a motor-driven gear, while the insert is provided with a rotation transmitting mechanism composed of such as gears for rotating the rotary core. If the insert is mounted in the insert holder, the driving source provided in the insert holder is coupled with the rotation driving mechanism provided in the insert, rotating the rotary core and making it possible to remove the moldings having a thread formed on an inner surface thereof from the rotary core by rotating the rotary core.

Abstract: Apparatus and method for forming a three dimensional injection molded article having a pair of passageways extending therethrough and with a locking indentation in each passageway using first and second mold parts each having open ended cavities having an end wall and a plurality of sidewalls formed therein wherein a pair of fixed arms are mounted on the end wall of the first mold part so that they are spaced from each other and each of the sidewalls, have portions extending out of the open ended cavity and have contoured surfaces and wherein a pair of movable arms are mounted on the end wall of the second mold part for rotation about fixed axes and are spaced from each other and from each of the sidewalls and wherein each movable arm has a contoured surface adapted to be moved into a continuous contacting relationship with the contoured surface of one of the fixed arms and when in the contacting relationship to provide protruding portions to form said locking indentations.

Abstract: Thin-walled elongated tubular products are individually formed utilizing injection molding of a plastic melt into a mold cavity having an elongated core pin maintained in substantially centered relation on the interior thereof through the application of tension continuously being applied coaxially to the core pin. Multi-unit or mass production techniques include use of a plurality of mold cavities each successively subjected to receiving a hot plastic melt injection wherein the resulting formed product is, through successive steps, removed from the mold cavity, trimmed, separated from the core pin, and possibly further processed for depositing in collection facilities or transferred to other processing steps.

Abstract: Described is an apparatus for injection moulding a cover on to a plastics-coated tubular paper case (2), the apparatus including an injection-moulding core (4) and an outer mould embracing same. So that, in the case of a paper tube (2) of quadrangular cross-section, the flat walls of the tube do not suffer deflection and the location at which the cover is injection-moulded on to the tube is reliably controlled, it is provided in accordance with the invention that at least one support portion (6) is mounted on the edge face (10) in outstanding relationship beside the straight upper outer edge (11) of the injection-moulding core (4), against which support portion the edge of the paper tube (2) can be brought to bear.

Abstract: A method of making a molded plastic component of an internal combustion engine. The method is for making a fuel rail and includes constructing particular core pins of the mold with threaded connections that form seals between them when they are disposed in proper position within the mold cavity for the molding of a fuel rail. The core pins serve to form a main fuel passage and auxiliary fuel passages which transversely intersect the main fuel passage. Each core pin that forms an auxiliary fuel passage includes a screw thread on its inner end that threads into a corresponding complementary threaded recess in the side of the core pin that forms the main fuel passage to create a corresponding seal. This sealing prevents any significant flash from forming in the fuel rail at the intersection of each auxiliary fuel passage with the main fuel passage. After the plastic has been molded, the core pins are unthreaded and withdrawn.

Abstract: A male mold member includes a base or body having a central projecting core with an intermediate peripheral tapered seat between the core and body. The body, seat and core are intercepted by a plurality of cylindrical bores spaced uniformly about the male mold member and inclined toward the core axis. The bores receive core blades having cylindrical bodies. The core blades are exteriorly shaped in the area of the core to form sections which continue the contour of the core and seat. The blades may each have a thread matrix in the core area. After molding, a stripper bushing, engaging the molded product, pushes the product along with the core blades to a position at which the core blades are collapsed so that the product may be stripped. In the molding position the stripper bushing has a tapered bore opening which fits snugly against the tapered seat portions on the blades to orient the blades to proper position and immobilize them.

Abstract: This disclosure illustrates and describes a test mold for the quantitative measure of the effects of formulation and/or process variable changes on some kinds of surface problems of a molded part caused by different degrees of imperfection or voiding underneath the part surface. The molded part can be single component or composite, solid or foamed. One example of the surface problem is the so-called "measles or cellulite" problem observed on the vinyl surface of a vinyl/foam composite due to the voids or rattiness within the foam. To accomplish this result, the mold has various sized, spaced apart, aligned openings formed in each of the front and rear walls of the mold, but with the centers thereof at different elevations in the respective front and rear walls. Removable rods inserted through the aligned mold wall openings produce longitudinal openings through the part which is molded around the rods, permitting the effect thereof on the surface of the molded part to be evaluated.

Abstract: A cooling apparatus for an injection molding machine, which is used to form hollow parts, employs mating mold dies with first and second corresponding hollow core members attached to the dies and extending into the mold cavity. When the cavity is closed, the hollow core members engage to form a continuous cooling fluid passageway through them. During the molding operation, liquid cooling fluid is supplied under pressure to flow through this passageway. At the end of the molding cycle, the flow of cooling fluid is blocked and a second valve is opened to admit air into the passageway near the point where the two hollow core members engage. A vacuum is applied to the opposite ends of both of the hollow core members to pull any cooling fluid and air from the junction between the core members and away from the junction back through the core members.

Abstract: An injection molding method for controlling the dimensions of a hollow plastic product by using a mold having a first and second mold parts; wherein one of the mold parts includes a retractable portion adjacent a gate. The retractable portion is movable between a protracted position and a retracted position while the mold is closed; and the mold parts define primary flow channels extending from the gate, which, when the retractable portion of the one mold part is protracted, direct initially injected molten plastic from the gate to create stabilizing regions of stiffened plastic. The method includes the steps of (a) protracting the retractable mold part; (b) injecting molten plastic from the gate and through the primary flow channels to create the stabilizing regions; (c) retracting the retractable mold part; (d) subsequently injecting additional molten plastic from the gate between the stabilizing regions into the side wall defining region of the mold cavity.

Abstract: An improved spout assembly for a squeeze bottle or the like includes an extensible dispensing tube slidably disposed in an elongated, hollow cap member, with the distal end of the tube extending from an orifice at the tip of the cap member. The tube is extensible from the cap member to a selected extended position. The cap member has an improved structure which includes a plurality of discrete, spaced-apart, rib-like bearing elements extending radially inwardly from the interior wall surface of the cap near the tip. The bearing elements frictionally engage the extensible tube so as to maintain the tube in a selected position. The cap member is made of injection-molded plastic formed in a novel mold assembly comprising a solid core and a hollow cavity. The core has a cylindrical plug extending axially from its tip. The plug snugly seats in a socket at the bottom of the cavity.

Abstract: A injection metal mold wherein a metal mold body having an article forming section therein and a metal mold fixing frame separately formed from the metal mold body, and on which the metal mold body is fixedly mounted and which is to be mounted on a molding machine body is constituted such that a slide mechanism section for a slide core which is moved into or out of the article forming section of the metal mold body in response to opening or closing movement of the metal mold body is provided on the side of the metal mold fixing frame. Further, a forming section of the slide core is formed as a separate member from the slide mechanism section and is removably mounted on the slide mechanism section.

Abstract: Disclosed herein is a mold assembly for molding a plastic article having a recess formed therein. The mold assembly includes a lower mold having a cavity formed therein; an upper mold adapted to be put on the lower mold to close the cavity; a core adapted to be put in the cavity; positioning means including a first member connected to a given portion of the cavity of the lower mold and a second member connected to the core, the first and second members being coupled when mated; and guide means for guiding the core in a manner to facilitate the mating of the second member with the first member.

Abstract: A collapsible core and molding apparatus and method for molding a plastic article having an undercut and a non-undercut portion. The collapsible core includes a center core pin and a core sleeve about the core pin and with the core pin having a small plurality of alternating, uniform, narrow, non-collapsing segments secured to the center pin and the same plurality of uniform, alternating, wider, arcuate, collapsing segments secured to the core sleeve, the wide collapsible segments adapted to move between the non-collapsed segments to form the expanded position for a molding operation where the wide segments are separated by the narrower segments, and a collapsed position where the collapsible segments collapse radially inward on the axial withdrawal of the center pin to form a generally cylindrical, cross section, arcuate area and to permit the ejection of a small molded plastic article from the mold.

Abstract: A plurality of rotational members which comprise an inner shell and an outer shell rotatable relative to each other and in which a soluble film is fixed to the inner periphery or the outer periphery of one of the shells, the shell with the soluble film fixed thereto is the shaping mold of a molding machine for molding the other shell, and a plurality of rotational members comprising an inner shell and an outer shell are molded through the soluble film, whereafter the soluble film is dissolved and removed.

Abstract: The apparatus includes a carrier plate cooperating with an injection molding machine and having at least two sets of cavities therein for cooling the hollow plastic articles, with the number of cavities corresponding to a multiple of at least two times the number of hollow plastic articles produced in an injection molding cycle. The apparatus also includes means for aligning one set at a time of said carrier plate cavities to juxtapose said set of cavities with the hollow plastic articles formed in an injection molding cycle, and means for transferring said hollow plastic articles to said juxtaposed cavities.