Abstract: The present invention is directed to split bodies for assembling a synthetic resin blower fan by a hollow article molding process. The split bodies have a first split body which includes a circular base portion and vanes extending radially and a second split body assembled on top of said first split body and is in a doughnut-shaped cap with an air inlet at the center thereof. Air channels are formed between adjacent pair of the vanes. The second split body includes a plurality of grooves which are formed on an inner surface opposite from the first split body in an assembled state. Each of the grooves extends radially along an edge of a corresponding vane and is adapted to be closed by the edge so as to define a flow path for allowing a molten synthetic resin to pass therethrough.

Abstract: A sprue gated injected molding system having nozzles with a removable hollow gate insert received in a seat in the forward end of each nozzle to form the gate. Each gage insert has a forward portion with a tapered outer surface which abuts against a matching tapered surface of an opening through to mold to the cavity. The forward portion of the gate insert is resilient which ensures extremely good contact between them under bearing pressure due to thermal expansion of the nozzle. Thus optimum uniform heat transfer is provided between the gate insert and the cooled mold. The gate insert has a circumferential removal flange to facilitate it being pryed out of the seat if replacement is required. In an alternate embodiment an elongated torpedo is seated centrally in the melt bore of each nozzle. The torpedo has an outer retaining ring and a number of radially extending tapered fins which form melt flow channels between them.

Abstract: A multi-cavity valve gates injection molding system. The pneumatic actuating mechanism to reciprocate each elongated valve member includes a piston which reciprocates in a cylindrical opening through a cylinder plate. A sealing bushing which is mounted around each valve member has a flanged portion which bridges an insulative air gap between the manifold and the cylinder plate. Thus, the sealing bushing forms part of the piston cylinder as well as sealing against melt leakage around the reciprocating valve member. The piston has a circumferential outer band formed of a graphite alloy seated in a groove formed between a front portion and a removable rear plate portion.

Abstract: An injection molding nozzle having a self-supported valve member actuating mechanism. The elongated valve member extends rearwardly into a cylinder assembly which is mounted on the main body of the nozzle. The rear end of the valve member is connected to a pneumatically actuated piston to reciprocate it between the open and closed position. A wedge clamp removably attaches the cylinder assembly to a connector member which is bolted to the rear end of the main body of the nozzle.

Abstract: Injection molding halves for forming disks having a plurality of cavities between a stationary mold unit, in which a plurality of sprue bushings and a runner with gates for introducing molten resin into said plurality of cavities are provided, and a movable mold unit in which a plurality of punches are provided concentrically to the sprue bushings for severing a central aperture of the molded disk, and an interval mechanism for providing a predetermined interval between a stationary mold unit and stationary mold base plate to ease the removal of escaped material, and connecting structure for connecting the stationary mold unit and the stationary mold base plate by alternative rotating of a connecting rod.

Abstract: An injection mold for injection-molding a tubular article having a bottom at one end and opening at the other end having a cavity plate and a core which define a cavity conforming to the shape of the article when closed. A gate opens to the cavity at a portion defining the bottom of the article. The core is provided with a coolant passage for circulating coolant up to a portion near the free end surface of the core for defining the bottom of the article. The inner surface of the core defining the end portion of the coolant passage near the free end surface of the core tapering toward the gate and the coolant passage extends near a portion of the free end surface of the core opposed to the gate, and at least one rib is provided on the inner surface of the core at the tapering portion to project into the coolant passage and to extend in parallel to the direction of coolant flow.

Abstract: A manifold assembly of the type used for conveying plastic injection molding material from a central injection point or sprue to a number of mold cavities or to multiple points within one large mold cavity. The assembly includes an integral manifold and a plurality of nozzles extending radially outward therefrom. Insulating rings are disposed about the nozzles for inhibiting heat transfer between the nozzle and the core or cavity and a stainless steel locating ring is disposed between the sprue and a support member, which supports the assembly. The locating ring inhibits heat transfer from the sprue to the support member. Aluminum plugs are disposed at the terminal ends of the manifold and inhibit heat transfer from the terminal ends. Preload pads are removably secured to the manifold radially opposite the nozzles for insulating and supporting the manifold under pressure. Heater bands supply the heat to the assembly and the temperature of the plastic injection molding material is monitored by thermocouples.

Abstract: A reheat blow mold machine includes a preform loader, an oven, a mold station and a preform transfer mechanism for transporting preforms from the oven to the mold station. A loader defines a plurality of lanes within which the preforms are supported. A reciprocal jaw assembly moves the preforms from a receiving end to a load end of the oven. The oven includes a plurality of tandemly arranged abutting pallets which rotatably support the preforms. The pallets are stepped through the oven and moved between a receiving end and a discharge end by a pair of elevators and a return conveyor. The transfer mechanism includes two sets of jaw assemblies, a pair of slidable actuators and a compensation mechanism to automatically adjust for tolerance variations in the diameter of the preforms. A mold station includes a pair of opposed platens which support mold halves. A bottom platen is positioned by a cam arrangement mounted on the opposed platens.

Abstract: An expansion injection molding die having a plate forming the die cavity, a backup plate, a core plate, ejector pins inserted through the backup plate and the core plate for separating the molded products from the die cavity, and a gas introducing passage communicating with the pressurized gas source for introducing gas into the die cavity. The plate that has holes through which the ejector pins are injected are formed with hollow portions. In each of the hollow portions, a guide ring is installed so that it is freely movable at least two-dimensionally. A sealing member is installed in an expanded hole portion in the guide ring so that it is in sliding contact with the ejector pin.

Abstract: A cavity insert for the ejection side and a core insert for the injection side of a mold are each shaped as a generally cylindrical, stepped body provided with circumferentially extending locking grooves and a liquid cooling or heating channel. Insert retainers and lifters having rotatable elements with locking tongues engaging the locking grooves clamp the inserts in the main mold frame. The main mold frame is provided with liquid conduits opening to opposite ends of the liquid channels so that the need for machining liquid conduits and channels for different inserts is avoided. Ejector tooling may be connected to the core insert for insertion and removal with it. The rotatable elements also have shoulders engageable with the inserts and may be axially moved to lift the inserts partly out of the mold frame to enable rapid changeover from one insert to another. Sliding wedges are used to releasably secure the ejector tooling to the master mold ejector plates.

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: This mold tooling has a hot drop assembly operatively mounted in a bore formed therein which opens to a mold face. Heated plastic material is fed to a feed tube of the hot drop assembly and this material is heated at a temperature higher than the working temperature of the mold during its transit the face of the tool by electrically energized heater bands encircling the feed tube. The space between the heater bands and bore wall accommodates tubing through which a flow of chilled cooling air is injected. The temperature and amount of the cooling air may be regulated to match the heat energy discharged by the heating bands into the bore and to the body of the tooling. The flow of cooling air transmits heat energy out of the bore so that heat sensitive plastic materials being molded is not degraded by hot drop assembly heat energy that otherwise would be conducted by the tool body to the tool face.

Abstract: An apparatus for high frequency molding by injecting a liquid plastic material under pressure into a mold, while simultaneously venting the inside cavity of the mold, optionally by applying to suction. In order to overmold and/or mold onto a prisoner a part in the form of a closed loop, a sealing insert (i) is disposed between the openings into the mold for its injection nozzle (17) and its venting nozzle (18). The shape of the insert corresponds to the profile of the mold, and the insert is made of a material having the same nature as the injected plastic material, such that the insert melts and is welded to the molded or overmolded part when the high frequency electric field is applied by means of an appropriate generator. The injection and the venting nozzle are controlled by respective double action actuator devices fitted with pistons and piston rods made of a material which does not exhibit dielectric loss, and forming a removable unit assembly.

Abstract: An injection bladder press characterized by a bladder mold including an upper mold part, a lower mold part and a mold core; a squeeze piston for squeezing the mold when closed; and an injection unit for injecting rubber molding material into the mold to mold a bladder therein. A flexible hose is connected at one end to the mold core for movement therewith and for delivery of fluid to the mold core, and at its other end to a self-retracting hose reel operative to pay out and retract the flexible hose during movement of the mold core. A top platen is mounted to a top bolster for movement away from the top bolster to facilitate access to the injection nozzle. The mold core actuator is located with a support column depending from a moving bolster. The support column is engaged by a pressure column for transfer of mold clamping force to the moving bolster from the squeeze piston in a bottom bolster.

Abstract: To provide a thermodynamic pinpoint gate nozzle which will permit a so-called cosmetic gate without stringing, and during which the plastic material to be processed is not subjected to high viscous or shear stress by the heating elements placed inside the nozzle channel, it is provided that the pinpoint gate nozzle on the side facing the mold cavity exhibits a low-mass inside nozzle (7) and that inside nozzle (7) can be heated by an ohmic resistance wire either inductively or by inside nozzle (7) formed as a Peltier element.

Abstract: A repair method for repairing electrical interconnect between an electrical bus bar and an electrically conductive ply of a heatable laminate. The method uses the steps of filling a syringe with an electrically conductive material, inserting the needle of the syringe into the laminate parallel to the conductive ply and along the surface thereof until the needle reaches the interconnect and then operating the syringe to inject an amount of the material into an area about the conductive ply.

Abstract: In a metal mold exchanging apparatus for use in an injection molding machine of the type wherein a metal mold is exchanged, there are provided a metal mold loading and unloading unit including a pair of metal mold supporting plates which are vertically spaced with a predetermined distance therebetween and an elevator for simultaneously raising and lowering the metal mold supporting plates for rendering the height of each one of the metal mold supporting plates to be equal to the height of position at which the metal mold is exchanged.

Abstract: It has been found that when layered preforms are being injection molded utilizing at least two materials, it is possible to maintain the same horizontal and vertical pitch of adjacent cavities as is possible when each mold cavity is being filled with a single material. Most particularly, it has been found that when the percentage of the material to be injected into a mold cavity is relatively high, it is possible to utilize a single metering pot for four adjacent mold cavities. On the other hand, if one of the materials to be injected into a mold cavity constitutes a relatively low percentage of the volume of a mold cavity, it has been found that a small metering pot must be provided for each of the cavities of the four cavity mold.

Abstract: A motor control device for an electric injection molding machine. The injection molding machine has a screw rotating mechanism including a rotary shaft associated with one end of a resin feeding screw received in a heating cylinder, a holding member rotatably holding said rotary shaft and slidable in the axial direction of said rotary shaft, and a first motor for driving said screw through said rotary shaft. The injection molding machine also includes a second motor for producing a force for advancing said screw in the injecting direction and retracting said screw, a screw shaft and a nut for converting the output torque of said second motor into linear movement, and a sliding member to which said nut is fixed. The motor control device includes a load detecting member fixed at one end to said holding member and at the other end to said sliding member, and a controller for controlling the operation of the first and second motors in accordance with the level of load detected by the load detecting member.

Abstract: A quick set sprue bushing for use in combination with injection molding apparatus. The bushing is made from a beryllium-free alloy that will rapidly dissipate heat. The alloy is of the copper, nickel type and reduces the cure time by between 15% and 20%. The significance of being beryllium-free is that it has been established that beryllium is a carcinogen and endangers workers. A bushing of this type results in the sprue or tail of the molten plastic type cooling as rapidly as possible for removal of the molded product from the mold. The bushing is elongated and has a generally conical passageway along its longitudinal centerline axis that diverges in the direction of the flow of material therethrough, and is further provided with a stainless steel bushing insert at the end that receives the injection mold apparatus nozzle such that the bushing will not conduct heat from the injection apparatus to the mold but will dissipate heat from the mold that comes from the molten material.