Abstract: An apparatus for casting polymer threads (32) in a nut cavity (14) complementary to the threads (44) of a casting screw (42) to minimize the formation of air pockets and air bubbles in the polymer threads. The cavity (14) of the nut (12) has a diameter larger than the diameter of the casting screw (42). The threads (32) of the nut (12) are formed in a polymer (30) which is dispensed into the nut cavity (14) and which cures around the threads (44) of the casting screw (42) after the screw is inserted into the cavity of the nut. The nut casting apparatus (10) includes support member (54) for closing the bottom of the cavity (14), and for containing the polymer (30) therein.

Abstract: An injection-molding tool for producing pipe fittings with an internal groove has bead-forming segments of the core alternating with one another on respective bell crank levers at alternating bell-crank levers being fulcrummed at fixed locations on a core sleeve while the other bell-crank levers are fulcrummed on a ring movable axially on the core sleeve. The actuator is a hydraulically or pneumatically moved actuating sleeve having grooves or slits receiving radial arms of the levers with abutments or end surfaces axially staggered so that one group of segments is retracted inwardly and axially first to allow the second group of segments to be swung inwardly.

Abstract: A wax pattern molding process, employing a mold having a cavity and a core structure in the mold cavity that include closing the mold with the core structure positioned in the mold cavity; injecting flowing heated wax into the mold to flow about the core; allowing the injected wax to cool and solidify to form the wax pattern; removing the core structure from the solidified wax pattern, while the mold holds the pattern in position in the mold; and opening the mold and removing the unencumbered wax pattern from the mold.

Abstract: In a molded intake manifold/fuel rail, a through-passage for the conveyance of combustion air is created by disposing two separably engaged core parts of the mold to occupy the entirety of the through-passage during the molding process. After molded material has solidified, the core parts are separated in generally opposite, but non-colinear directions. During the molding process, one core part occupies the entire length of the through-passage along a certain circumferential extent of the through-passage while along another circumferential extent, both core parts conjointly occupy the entire length of the through-passage.

Abstract: A tape cassette reel molding apparatus which includes upper and lower opposed molds for forming upper and lower flanges of the tape cassette reel and first and second hub molds provided between the upper and lower molds, the first and second hub molds each having an opposing face which has a semicylindrical cavity therein, at least one of the first and second hub molds being slidable in a direction parallel to the face of the upper mold and away from the other of the first and second hub molds so that when the upper and lower molds and the first and second hub molds are slid into position against each other, the respective cavities therein are all contiguous and a unitary tape cassette reel can be molded.

Abstract: This disclosure relates to a mold ejecting apparatus for ejecting an inner mold from a cylindrical molding, e.g. a cylindrical rubber molding, sticking to the outer circumference of the inner mold, or for ejecting the cylindrical rubber molding from the inner mold. A plurality of small holes are formed through the circumferential wall of the inner mold, and a pressurized fluid feed line is connected to an opening in one end face of the inner mold to introduce a pressurized fluid into the hollow interior of the inner mold. A plurality of matching members are movable to contact or come close to the outer circumference of the inner mold and match with an end face of the molding, the matching members being movable towards and away from the outer circumference of the inner mold. A pressing apparatus is provided for moving the molding relative to the matching members and the inner mold and separating them.

Abstract: A method and apparatus are described for forming a closure device having a cylindrical plug and a cylindrical collar extending coextensively and coaxially from a cap. The apparatus includes an outer mold defining an injection mold cavity. A cylindrical hollow outer core extends into the injection mold cavity and a cylindrical inner core extends into the injection mold cavity within the hollow outer core. Pushing means separate the molded part from the inner core. A stripper separates the part from the outer core by engaging an annular shoulder on the part. The part is pushed free of the mold's inner core after the outer mold is removed but before the stripper is advanced to engage the annular shoulder.

Abstract: A mold for skin covered foamed plastic molding which utilizes a middle mold to be placed between an upper mold and a lower mold, capable of reducing the weight of the middle mold so that assembling of the middle mold becomes less troublesome, the assemblage becomes more stable and the appearance of undesirable spacing in the assemblage an be prevented. The mold includes an upper mold to be closed over the lower mold, having a bent portion with a bottom surface which is to be a part of molding surface; and a middle mold to be placed between the upper mold and the lower mold, having a hollow region into which the bent portion of the upper mold is to be engaged when assembled.

Abstract: This invention relates to a mold for making a formed chair arm with passages therein.

Abstract: A modular unscrewing injection mold and core assembly therefor includes a mold base, a core receiving opening extending through the mold base, the core assembly being removably mounted in the core receiving opening and including first and second core shells that may be secured together to receive a rotating core therebetween; a mold core rotatably mounted between the shells; a pinion gear formed on the mold core for being driven by a rack in the mold base, for rotating the mold core; the core assembly being releasably secured in the base.

Abstract: An apparatus for molding a cap (16) including a base portion (18) and peripheral skirt (20) extending axially from and about the base portion (18) includes an outer surface forming mold (44) for forming an outer surface of the base portion (18) and the peripheral skirt (20) and an inner surface forming mold (46) seatable within the outer surface forming mold (44) for forming an inner surface of the base portion (18) and the peripheral skirt (20). The outer surface forming mold (44) is retractable from seated engagement with inner surface forming mold (46) for exposing the molded cap (16) therebetween. The inner surface forming mold (46) includes a core portion (52) and lug forming mold portions (54) disposed radially peripherally thereabout, the lug forming mold portions (54) being able to project axially from and retract radially inwardly relative to the central core portions (52) for releasing and ejecting the molded cap (16) from the inner surface forming mold (46).

Abstract: A liquid tight connector for affixing, in a liquid tight manner, to a conduit having a ridge located adjacent to its end, wherein the conduit extends into a bore (5) and abuts against a sealing surface (6) and is held in liquid tight engagement therewith. A locking member (9) projects into the bore (5) and locks on to the ridge of the conduit.

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: A resin transfer molding core has an outer surface and internal communication passages. One internal communication passage has an inlet opening and at least one discharge opening extending through the outer surface of the core. At least a second internal communication passage has a discharge opening extending through the outer surface of the core and at least one inlet opening. A preform comprises the core with fiber reinforcement material on the outer surface.

Abstract: A segmented mandrel is adapted for use in fabricating large diameter, light weight articles (such as aircraft component structures) made of thermosetting composite materials by placing fiber on the external surface of the mandrel followed by autoclave curing of the composite materials. The segmented mandrel is composed of a center shaft extending lengthwise through the mandrel, four mandrel segments mating together along a seam between their respective adjacent edges, T-stiffeners for fastening the mandrel segments together, and bulkheads rigidly mounted around the shaft and connected to the stiffeners. This segmented mandrel is reusable, is easily assembled and disassembled, and has a system that creates a vacuum seal between mandrel sections while at the same time retains the functions of support and alignment of the mandrel segments carrying the parts being cured.

Abstract: An apparatus for forming voids in concrete which includes baseplates secured to a wood supporting deck or form for a concrete floor by a plurality of removable screws and a removalbe sleeve attached to each baseplate and having a height generally equal to the thickness of the floor with the upper end of the sleeve being accessible and observable when concrete is poured. After the baseplates have been secured in place, various subsequent work procedures may be carried out without the workers encountering obstructions that would exist if upwardly projecting cavity forming members were attached to the wood deck. A sleeve is then attached to each baseplate immediately prior to pouring concrete. After the concrete has been poured and set, the sleeves are detached from the baseplates and removed. The wood deck can then be stripped from the bottom of the concrete floor and the baseplates removed for reuse.

Abstract: A one-piece molded end closure has a pull ring spaced from a main panel having an annular flange extending therefrom. When the end closure is frangible through having score lines formed in the main panel, the pull ring is connected by a tenon adjacent a score point, which is the junction of two score lines and inside of the inner diameter of the pull ring, so that pulling on the pull ring, which is substantially parallel to the main panel, starts rupturing of the two score lines. The end closure also may be a plug type having a friction fit within a container whereby there are no score lines; the pull ring is still used to remove the end closure from the open end of the container. The method and apparatus for molding enable production of the end closure as one piece without any tearing of the pull ring or rupturing of the score lines when the end closure is removed from the molding apparatus.

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 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: A method and apparatus for forming a laminated bifocal lens which includes forming a frontal lens component having a bifocal element in a substantially stress-free manner and bonding the frontal lens component to a rear lens component which is also formed in a substantially stress-free manner. The laminated lens so provided may be inexpensively formed, is lightweight, and has optimum optical and physical characteristics.

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: The closure device provided for a container ending in a neck is of the type comprising a cap (1) with a lid (5) which is hinged thereon.With a view to facilitating the molding operation of the cap and the lid thereof in one single piece, the hinge (6) is a double hinge having a few millimeter width.

Abstract: A molding machine for casting a concrete product includes a stationary support system, a rotatable apparatus and a pair of bearings supporting the rotatable apparatus on the stationary support system. The rotatable apparatus rotates 180 degrees between an upward position and a downward position. The rotatable apparatus includes a mold having a configuration form, exterior wall-forming panel, interior wall-forming panels, and interior corner-forming panels, all of which hang from corresponding trolleys which ride on corresponding rails to form the walls of the concrete product when all of the panels are against the product's configuration form. Further included is a floor panel which cooperates with the interior wall-forming panels and the interior corner-forming panels and is supported thereon by an internal structure. The floor panel, the interior wall-forming panels, and interior corner-forming panels are positioned below the exterior wall-forming panels and spaced therefrom to contain the concrete therein.

Abstract: Disclosed herein is a die member for forming a lost foam pattern for casting a cylinder block having a cylindrical bore with an axis and a helical transfer passage including a first portion permitting die member separation in a direction along the axis of the cylindrical bore and a second undercut portion preventing one-piece die member separation in the direction along the axis of the cylindrical bore, which die member comprises a projection forming a first cavity corresponding to a first part of the first portion of the transfer passage, and a core carried by the die member and movable relative to the die member between an extended position forming a second cavity corresponding to a second part of the first portion of the transfer passage and the undercut portion of the transfer passage, and a retracted position affording separation of said core through the second part of the first portion of the transfer passage and in common with separation of said projection from the first portion of the transfer passage

Abstract: A process for applying tension to the extending ends of a thin wire core of a mold to apply tension to the core during the molding process to maintain alignment of the core at all times during the molding process. Also included is apparatus for carrying out the process. Also included is a generally tubular part having a fine diameter hole therethrough.

Abstract: A die member for forming a foam pattern for casting a cylinder block in a lost foam casting process, the pattern having a cylindrical bore with an axis, and a helical transfer passage including a first portion permitting die member separation in a direction along the axis of the cylindrical bore and an undercut portion preventing one-piece die member separation in the direction along the axis of the cylindrical bore, the die member comprising a main portion forming at least a portion of the cylindrical bore and including a projection forming a first part of the first portion of the transfer passage, and a core carried by the main portion and movable relative to the main portion along a line in a plane substantially perpendicular to the axis of the cylindrical bore, the core being movable between an extended position in which the core forms a second part of the first portion of the transfer passage and the undercut portion of the transfer passage, and a retracted position in which the core affords separation o

Abstract: A method of making a boat comprises moulding a hull (6) with an external longitudinal recess (7), securing a folded inflatable bag (8) within the recess, and fitting a cover (9) into position over the recess such that it can be blown clear thereof when the bag is inflated to provide buoyancy during an emergency.

Abstract: A device for inserting and withdrawing a core in plastic and die cast molds. A rotatable cylindrical nut is located within the hollow cylindrical interior of a support housing. The nut has a threaded inner cavity. A non-rotatable slide extends through an aperture in the housing, the slide having a threaded end engaging the threaded inner cavity. When the nut is rotated, the slide is either extended or retracted through the aperture depending on the direction of rotation of the nut. A mold core is affixed to the slide for insertion into and withdrawal of the core from the mold.

Abstract: An injection mold having a pair of stationary and movable molding plates, a plurality of sidewalls moved by one or more hydraulic cylinder assemblies disposed between the stationary and movable molding plates through inclined guide pins or guide blocks, a core member provided with a slanting surface and secured to the movable molding plate inside the sidewalls, and slide core members being movable in engagement with the core member. The respective sidewalls, and the sidewalls and the slide core members are connected by a connecting mechanism including link plates and connection plates so that the sidewalls and the slide core members are substantially simultaneously moved by at least one of the hydraulic cylinder assembly.

Abstract: A hollow core for a concrete block is cast from an abrasion resistant alloy steel known in the trade as #8620. The core is generally rectangular in cross section and includes a top wall and depending side walls. The side walls are ground to a mirror-finish and the fine tooling grooves formed when the side walls are ground are all parallel to each other and transverse to the top wall of the core. This greatly lessens the frictional resistance between the core and the cement greatly increasing the useful life of the core in comparison the cores previously constructed.

Abstract: Apparatus and method are described for injection molding of thermoplastic paint cans substantially similar in size and design to the conventional steel one-gallon paint can. The apparatus comprises a cavity element defining the exterior of the container body and a core mold element including a peripheral lip protruding into the interior of the can body at a point below the upper terminus of the top circumference of the container body, thus providing a peripheral upwardly projecting edge. The cavity element includes a plurality of cam elements which move cooperatively on separation of the core and cavity elements. The cam elements grip the ridge of the container and expand it outwardly sufficiently to permit the core element of the mold to be removed from the container without hindrance from the inwardly protruding lip.

Abstract: The invention relates to a collapsible core for a mould. The core comprises three relatively movable assemblies. The first assembly carries a cone, the second assembly carries an inner set of segments which form part of the core surface and engage the cone and the third assembly carries outer segments moved by inclined pins on the second assembly. As the assemblies are moved together the outer segments move radially outwards and the inner segments move axially in between them. Then the inner segments move radially outwards and the cone fills the center of the core. On reversal of the movement, the core is collapsed to enable it to be withdrawn from the moulded article.

Abstract: A weather strip for an automobile has a base portion to be installed along an opening of the automobile for a door, and a hollow sealing portion to be pressed by an outer peripheral edge of the door. One portion of the hollow sealing portion is formed into a molded portion by molding. The molded portion has a slit through which a core for forming the molded portion hollow is drawn out, and a partition wall longitudinally partitioning an inner space of the molded portion and separating the slit in the middle thereof. The partition wall extends straight in the direction inclined with respect to the door pressing direction. According to the weather strip of the present invention, the separated slit is not widely opened at the door pressing time by virtue of the partition wall, and accordingly, uniform flexibility can be obtained over the whole length of the molded portion since the partition wall is inclined with respect to the door pressing direction.

Abstract: An improved, one-piece slide clip suitable for molds having at least one cam-actuated slide for pulling a core element outward and inward from the parting line of the mold as the mold is opened and closed, the said slide clip being wholly enclosed within the mold and non-restrictive of the normal and required movements of the mold remains inoperable until such time the slide moving along the cam outwardly is gripped by the jaws of the clip upon the removal of the cam from the slide, during the opening operation, holding the slide in a cam-aligned position, releasing the slide only upon the re-engagement of the cam pin into the slide during the closure of the mold, thereby allowing the slide to return to the molding position in the fully closed mold.

Abstract: An injection molding apparatus is used to line flanged pipe elbows. The pipe elbow is clamped by the flanges to two pivotted platens, one of which has a curved mandrel to shape the inside of the elbow lining.

Abstract: An injection mold for molding a tubular article having a closed end comprises a stationary mold half including a cavity plate having at least one cavity impression and a movable mold half which is movable between a closed position and an open position and is provided with at least one core portion for defining a cavity together with the cavity impression when the movable mold half is moved to the closed position. A recess is formed in the top face of the core portion and a telescopic mold piece is fitted into the recess in such a manner that a narrow space is formed therebetween. An air chamber having a relatively large volume is formed in the vicinity of the top face of the core portion. The air chamber is communicated with the space over the top face of the core portion by way of the narrow space between the mold piece and the recess, and with the atmosphere by way of a communicating passage formed in the core portion.

Abstract: An improved molded plastic closure having an integral tamper indicating band including a plurality of upwardly and inwardly extending tabs is disclosed. Also disclosed are an improved mold and molding process for the production of such a closure. The closure comprises an upper skirt portion and a lower tamper indicating band formed integrally with the upper skirt portion. Connected to the tamper indicating band and depending upwardly and inwardly therefrom are a plurality of tabs adapted to cooperate with an annular bead provided on a container finish. The tabs are molded in their upwardly and inwardly extending orientation so that free ends of the tabs terminate radially inwardly from an inner surface of the upper skirt portion. A two-piece core is used to form the inner surfaces of the upper skirt portion and the tamper indicating band. The tabs, in their as-molded orientation, are positioned to interfere with the core during removal of the closure therefrom.

Abstract: The invention comprises a method and apparatus wherein an insert, preferably made of plastic and preferably allowing a melt-on bonding with the tubes and whose floor has a traversing opening for each tube, is inserted into the first part of the injection mold (top mold or bottom mold) as a positioning element for the tubes in such a manner that the insert is at least partially locked or secured into the first part of the injection mold. A tube is then placed in each opening of the insert. A mandrel is then placed in each tube, whereupon the injection mold is locked in such a manner that, if necessary, the mandrels are locked into the second part of the injection mold (bottom mold or top mold). A molten thermoplastic material is then injected, via a sprue provided in the injection mold, into a cavity formed by the injection mold, the insert and the tube ends.

Abstract: A novel plastic mold and method is disclosed for forming a Luer nut which has a polygonal internal cross-section. The mold includes both movable and fixed cavity sections, so that a non-round threaded core can be unscrewed from within the Luer nut.

Abstract: A clipboard 2 with a board portion 4 has a pair of rearward projections 6, on either side of a clip for retaining paper 10, for enabling the clipboard 2 to be supported on and retained by a steering wheel 9.

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: Injection moulding core for pipe bends, with at least one straight pipe terminal portion, wherein the bend core is divided in various segments (a) which are preferably wedge-shaped when viewed sideways and which are connected by appropriate elements preferably mushroom-shaped projections (c) to form a chain so that the medial line (b) of the chain of segments may form a straight line, and which are mutually fixed by appropriate elements, preferably centering pins (d) or adjusting springs and/or an edge overlapping the various segments (a), in order to avoid any displacement and torsion, and which comprise one or a plurality of holes (e) through which pass one or a plurality of traction elements, preferably metal cables (f) which are connected to the last segment (a) of the chain, whereas they are connected to displacement elements (i) at the other end of the chain by means of a core (h) fixed preferably to that end of the chain and provided for the straight pipe terminal portion.

Abstract: An injection molding system is provided with a plurality of wall segments which are displaceable substantially radially for forming a substantially continuous wall which forms an internal wall of a hollow region which is intended to be filled with molten molding material. In a preferred embodiment, the wall segments are urged into sliding communication with one another and sealable engagement with a further wall portion by operation of an actuator assembly which is provided with canted pins which cause the wall segments to be moved radially inwardly and outwardly in response to orthogonal displacement of the actuator assembly. The invention is therefore particularly suited for forming molded articles having hollow interiors and/or internally ribbed portions. In an embodiment where a slot is desired in the molded article, a slot core is arranged to communicate with the molten molding material, so as to form the slot, and an ejection mechanism.

Abstract: A mould which is used for the production by injection moulding of fittings which have an inner annular groove includes a divisible outer mould, a mould core and a mould ring. The mould core has a plurality of segments which can be folded together. In order to ensure with absolute reliability that the fitting does not remain clinging to the mould ring during removal of the fitting from the mould, the mould ring is connected to the mould core and is withdrawn together with the mould core from the fitting.

Abstract: The molding apparatus of this invention produces a one-piece molded unit that provides a two-piece plastic fastener whereof one piece is a grommet having a head with a flat front surface and forwardly projecting legs defining a sidewardly and forwardly opening slot, and the other piece is a pin receivable through the head and forwardly slidable in the slot to an operative position holding the front ends of the legs flexingly diverged. As molded, a front end portion of the pin is connected with the head by a frangible flashing. A forwardly opening radially extending groove in the front of the head, opening from one side of the slot, defines a substantially flat forwardly facing groove surface that is rearwardly offset from and parallel to the front surface of the head and is flush with the front end surface of the pin. The molding apparatus comprises two die members, each having a flat surface to which opens a cavity defining one longitudinally extending half of the unit that includes a half of each leg.

Abstract: A bucket-shaped container having a rim opening smaller than the diameter of the side wall thereof is injected molded from thermoplastic material using a die set including a molding core which collapses to allow axial removal of the molded container from the mold. The molding core comprises a plurality of individual, wedge-shaped outer core sections which collectively form a continuous molding surface and are slideably mounted on a tapered inner core to allow axial sliding movement of the outer core section relative to the inner core. The sliding movement of the outer core sections on the inner core is provided by a plurality of keylocks which are fixedly secured in corresponding axial keyways in the inner core and which slideably engage corresponding axial keyways in the outer core sections.

Abstract: In a method of using an elongate steel core for making passages in a body of castable material, preferably concrete which is cast in an outer mould, the core is prestressed prior to casting, and to disengage the core from the finished body, the prestress is relieved against the body or the outer mould when the material has set sufficiently. The core is provided at its ends with anchoring means for one or more tensioning members extending therebetween for prestressing the core prior to casting, the prestress for disengaging the core from the finished body being relievable against said body or said outer mould by means of an abutment engageable therewith.

Abstract: A method of releasing an inner mold from a rubbery elastic molding having a corrugation in its inner longitudinal cavity and adapted suitably for, but not limited to, use in an electrical bushing or electrical insulator, which method comprises steps: forming a partial space connecting to a pressure source at an interface between the molding and the inner mold; supplying a pressure medium such as a gas or a liquid from the pressure source into the interface via said space to form a desired space between the molding and the inner mold over its entire zone and to expand the inner cavity of the molding; and releasing the inner mold from the molding.

Abstract: A mold for forming a plastic cap and removing a cap from such a mold. The mold comprises female and male members which, together, form a mold cavity in which the cap is formed. The female member includes an upper assembly and a plurality of cams. The cams have radial protrusions engaging the male member to form annular recesses in the cap. The cap is removed from the mold by moving the upper assembly of the female member axially and the cams thereof radially away from the cap, and then removing the cap itself from the male member of the mold. Preferably the cap is shrunk onto the male member to develop a space between the cap and the female member of the mold prior to moving the female member away from the cap.

Abstract: This relates to a mold for forming closure caps and like cap-like members having a peripheral body with internal threads. The mold is constructed to have an irregular parting line with the result that a major part of the body of the closure cap may be externally defined by that mold member which is moved to an out-of-the-way position when the mold is opened, leaving the injection molded closure cap body free for radial expansion and thus permissible stripping of the closure cap from the core about which it is molded. This construction eliminates the customary ejector sleeve and permits the base mold member to function as an ejector block for directly stripping the molded closure cap from the core. This construction permits mating tapered surfaces on the base mold member and the core which form a seal and do not have relative sliding contact, thereby eliminating previous undesired wear surfaces.