Abstract: An injection nozzle has gearing which drives a valve pin to open and close a mold gate, with a venting chamber in a nozzle body allowing vapors to escape before reaching the gearing to avoid fouling of the gearing. The valve pin is actuated by a hydraulic cylinder driving the gearing, which includes a pair of pinion gears driving gear teeth on either side of the upper end of the valve pin. An adjustable stop is provided limiting piston travel in either direction, allowing adjustment of both the closed and open positions of the valve pin.

Abstract: A method of injection molding of workpieces, formed of at least two different layers, and which includes forming at least one layer from lacquer, with the apparatus for effecting the method including at least two injection molding devices for forming melts of lacquer and non-lacquer materials and an injection unit communicating with the two devices for injecting the two melts into a mold cavity of a mold.

Abstract: A mold assembly is provided for use in an injection molding machine and includes a cavity plate defining a cavity adapted to receive a moldable material, and a manifold positioned behind the cavity plate. The manifold includes a passageway for guiding the flow of the moldable material to the cavity plate. A support plate is positioned adjacent the manifold and includes a rear face into which a cup shaped recess extends, a front face opposite the rear face, and a bore extending between the front face and the recess. A nozzle is provided between the passageway in the manifold and the cavity in the plate for directing the flow of material into the cavity, and a valve gate pin extends into the nozzle. The valve gate pin is movable between a forward flow-blocking position and a rearward flow-permitting position, and a cylinder unit moves the valve gate pin between these positions. The actuator includes a drop-in pneumatic actuator secured within the recess of the support plate.

Abstract: An improved design for an injection molding apparatus for creating of products from fluid plastic material wherein a hydraulic flow divider can be used for simultaneously actuating of multiple hydraulic injectors which need not be linearly positioned. This molding apparatus is usable with a hydraulic flow divider since a unique configuration of a fixed frame with a cage mounted movably therein and a hydraulic cylinder assembly mounted movably within the cage allows the injection molding apparatus to use the same amount of hydraulic fluid during each and every stroke regardless of the length of the stroke of the rod relative to the nozzle. This unique capability is achievable by allowing the hydraulic cylinder assembly in its entirety to move within a predefined cage configuration even after the entire stroke is completed in order to allow the cylinder to accept the amount of powering hydraulic fluid associated with a single complete stroke.

Abstract: A multi-plate injection molding tool has multiple cavities. It includes a hot-runner plate, a hot-runner distribution block adjacent to the hot-runner plate, and a plurality of hot-runner nozzles. The hot-runner distribution block is a monolithic seamless metal block. A lower die plate is removably attached to the hot-runner plate, and an upper die bolster is adjustably attached to the lower die plate and is movable along fixed guide columns. The upper die bolster comprises a base plate, a stripping plate and a slide plate. A plurality of form cores are supported on the upper die bolster, and a plurality of annular stamps are attached to the lower die plate, each being around a form core and each having a conical exterior surface tapered towards the lower die plate, and cooperating with a die; a plurality of dies is carried by the lower die plate, and each has a mating conical surface for receiving the conical surface of a stamp in close fit therewith when the molding tool is closed.

Abstract: In a thermal plastic molding device, a thermal insulator is provided between the nozzle assembly and the surrounding plates. Preferably, the insulator is a ceramic material, such as zirconia oxide, which is sprayed on in a thin coating, preferably in the range of 0.007-0.012 inches. Alternatively, other nonmetallic coatings can be used, or the insulator can be provided as a ring around the nozzle assembly instead of as a coating. A coating can be applied either to the plate or to the nozzle assembly. A protective coating, preferably a metal, is sprayed or plated over the ceramic insulator.

Abstract: A hot runner valve gated system comprising at least one nozzle housing adapted to be positioned in a manifold plate. The nozzle housing includes a gate orifice and a reciprocal valve stem positioned therein. The system also includes a mechanism for moving the valve stem for opening and closing the gate valve and is designed to maintain the mechanism for moving the valve stem in a substantially cooled state. The mechanism for moving stem is positioned coaxially relative to the nozzle housing.

Abstract: An injection molding apparatus particularly usable for low pressure structural foam molding with improved control device for providing adjustment and controlling relative positioning between the injection molding apparatus and the mold. A novel device is included for adjusting the nozzle body with respect to the injection molding apparatus and for adjusting the nozzle rod with respect to the nozzle body. An improved device is also included for facilitating adjustment of injection stroke length and of the position of the nozzle body as well as automatic adjustment of positioning of limit switches responsive to indicate the extremes of movement during the cyclical injection stroke. Automatic and manual devices are also included for maintaining alignment between the nozzle rod and the nozzle body extending therearound.

Abstract: Injection nozzle for a mould, with a straight sprue. The shutoff valve is accommodated in a suitable seat which obliquely intersects the sprue and opens out in the gate. During injection the head of the shutoff valve leaves the sprue clear. After injection the head of the shutoff valve shuts off the gate.

Abstract: A local pressurizing type injection molding apparatus including a stationary die, a movable die disposed for movement into and out of contact with the stationary diet a first local pressurizing pin extending through the movable die and having a tip facing a gate, and a second local pressurizing pin extending through the movable die and having a tip facing the cavity. The apparatus is further provided with first advancing mechanism for advancing the first local pressurizing pin, second advancing mechanism for advancing the second local pressurizing pint and a device for individually setting the points in time at which advancing movements of the first local pressurizing pin and the second local pressurizing pin are started and for individually setting the pressurizing pressures given by the first local pressurizing pin and the second local pressurizing pin.

Abstract: The injection nozzle has a thin-walled centering bushing inserted between the tip insert and the mold insert. The centering bushing engages a shoulder of the mold insert and thus achieves a mutual centering and sealing of the tip insert and the mold insert. This avoids the inflow of molding material into the cavity between the tip insert and the mold insert which would impair or delay the changing of colors of the material, and the injection needle is effectively centered so that a cylindrical tip portion can close a very short cylindrical portion of a gate bore. The heat transfer between the heated nozzle parts and the mold insert is nevertheless maintained at a low level since the mutual centering is obtained by narrow contact sites.

Abstract: An improved hot tip (40) for forming a thermoplastic body having a mold cavity (42) and a gate portion (44) has an elongated body member (46) and a channel (48) passing axially through the body member (46). The channel (48) has an inlet end (51) and outlet end (52) for passing a molten material, such as an amorphous resin, therethrough. The body member (46) has a necked-down portion (54) surrounding the outlet end (52) of the channel (48). The necked down portion (54) is configured to permit the outlet end (52) of the channel (48) to proximately contact the gate portion (44) of the mold cavity (42) resulting in a formed body having vestigeless gate.

Abstract: A rotary actuated gate valve for directing melt from a channel in a manifold to a mold gate includes a valve stem extending through and rotatable within the manifold. The valve stem includes a groove in fluid communication with the channel, wherein the groove is adapted to be rotated into alignment with the mold gate and channel for allowing the melt to flow into the mold gate. The groove is also adapted to be rotated out of alignment with the mold gate and channel for blocking the melt from flowing into the mold gate. The gate valve also includes a mechanism for rotating the valve stem. Another embodiment includes a rotatable housing having a groove, which operates in a manner similar to the valve stem design.

Abstract: A manifold is disposed within a pair of abutting pre-load mold plates in a pre-load relationship. Fluid flowing through the manifold is heated by a first heater. The fluid is then divided into a plurality of passages in the manifold. Pairs of passages have a back-to-back in-line relationship. A cylinder between each pair of the in-line passages holds a pair of pistons in the in-line relationship. Each piston in the pair has piston units in an interdigitated relationship with piston units on the other piston in the pair. Each pair of pistons is movable by pressurized fluid (e.g. air) between first and second positions. In the first position, each piston provides for the fluid (e.g. resin melt) flow through one of the passages to a pair of runners in the manifold. In the second position, each piston prevents the resin melt flow through the passages. A first heater heats the resin melt flowing through the passages. A second heater heats the resin melt flowing through the runners.

Abstract: A device for injection molding articles of plastics material having hollow spaces. The device includes a molding tool with a mold cavity. Plastics material melt is fed to the mold cavity through a nozzle. Another pressurized medium is supplied to the mold cavity through a hollow needle at a location different from the location of the nozzle. A needle core is mounted in the hollow needle. The needle core is axially displaceable within certain limits. The opening of the hollow needle to the mold cavity can be opened and closed or its cross-sectional area can be varied by moving the needle core.

Abstract: To provide a resin molding method and apparatus that may realize a sprue runnerless system with a very simple structure and at a low cost, a molten resin 4 is fed from a resin supply portion 1 into a pair of cavities 3 through a resin passages 2 such as a sprue portion 2A and a pair of runner portion 2B for molding the resin. The method includes the following steps of: moving a resin return member 5 toward the resin supply portion 1 after supplying the molten resin 4 into the cavities 3, the resin return member 5 being disposed so as to be projectable into the resin passage 2 and movable through the resin passage 2; and returning a waste molded resin 6 under a molten/solid condition within the resin passage 2 back into the resin supply portion 1 under a molten condition by a heat of the resin supply portion 1.

Abstract: A molding apparatus for plastic parts which includes a stationary core plate and a moveable cavity plate used to form a mold cavity, and an ejector plate with pins utilized to eject the molded part from the apparatus. The valve used to inject the liquid plastic, which may be coupled to the core plate or the cavity plate, is always located on the same side of the plastic part as the ejector plate.

Abstract: In order to facilitate the formation of a plastic member with an aperture in a central portion thereof, a ring gating valve arrangement is provided with a multi-piston servo arrangement which enables a specially configured pin to be stepwisely reciprocated back and forth within a molding device. The pin is formed with a land at one end which is dimensioned and shaped to produce the required aperture. The pin further features a channel structure which includes an annular recess adapted to permit plastic to flow into the center of the mold cavity area when the pin is thrust to a predetermined location. After the cavity is filled with hot plastic, the pin is retracted to a position wherein the annular recess is located within a removable gate bushing and the shaped land is pulled up until it is appropriately located in the mold cavity area. As the injected plastic cools and solidifies, the shaped land acts as the aperture molding pin and forms a clean aperture in the molded part.

Abstract: Valve gated injection molding apparatus wherein the reciprocating valve member extends into the melt passage through a sealing bushing. The sealing bushing has a thin steel collar portion which extends forwardly into the melt passage and fits around the valve member to form a seal against leakage of melt rearwardly along the valve member. In the preferred embodiments, the collar portion is thin enough that it is slightly compressed around the valve member by the pressure of the surrounding melt in the melt passage to improve the seal.

Abstract: A valve gate injection molding apparatus, in which the gas produced within a heating probe is discharged through a gas discharge outlet groove from the base side of a valve pin, leak of the resin melt is prevented by flowing a cooling fluid for controlling the temperature to increase viscosity of the resin melt, and preventing overheat of the valve pin actuating assembly caused by heat conduction from the heated and pressurized resin melt.

Abstract: A pin closure nozzle for injection molding molds has several working pistons acting on the same closure pin. These working pistons are arranged on a common throughgoing piston rod. Each piston rides in its own chamber and the piston rod passes through and is slidingly guided in openings in the chamber floors. The piston rod thus has at least two sliding guides and is accordingly prevented from tilting.

Abstract: In an injection molding machine, a skin layer resin 26 is injected from a first hot runner 10b into a cavity C in a mold or molds and then a resin passage between the first hot runner 10b and the cavity C is closed, thereby finishing the injection of the skin layer resin 26. A core layer resin 28 is injected from a second hot runner 12b into the cavity C in the mold(s) at a predetermined timing during the period between the start and end of injection of the skin layer resin 26, thereby molding a sandwich molded product without hesitation marks.

Abstract: This invention concerns an injection molding nozzle device (25) provided with an operating valve (31) installed movably in the axial direction inside a nozzle body (4) possessed of a resin passage (12) and enclosing therewith a fluid passage (10) incorporating therein a check valve (11). This injection molding nozzle device is furnished with a fluid discharge open-shut device capable of opening or shutting a fluid discharge passage (17) formed separately of the fluid passage (10) or the check valve (11) of the fluid passage (10).

Abstract: A molding apparatus for plastic objects which includes a valve which allows ejector pins to be positioned in close proximity to the valve needle. The valve includes a valve body and a flange surrounding at least a portion of the valve body such that the outer edges of the valve body and/or the flange may have slots which extend lengthwise from the top to the bottom of the valve. Depressed portions in the side portions of the flange and corresponding outer edges of the valve body may also extend through the length of the valve. The slots and depressed portions may be utilized for positioning ejector pins in close proximity to the valve needle.

Abstract: A multiple closure pin nozzle assembly serves for the simultaneous charging of several individual molds in an injection molding mold and has two or more closure pins arranged in a common housing and driven by a common piston drive. Each closure pin closes a nozzle orifice arranged relative thereto and can be pulled back from this in order to allow the injection of molding material. In the region of the respective nozzle mouth, a heating device is arranged. In the common housing, feed channels are provided with branches which lead to the individual closure pins and their mouths. The common housing is split up below this common feed channel and its branches into separate housing portions connected with the common housing and each accommodating an individual closure pin and nozzle mouth. The housing portions have walls which run around the pins and interspaces between these walls to enable supports for the multiple nozzle assembly to be introduced below the common housing region between the housing portions.

Abstract: The present invention relates to a bi-metallic clamping system for holding a heater firmly on the external surface of a hot runner nozzle body. The band heater-clamp arrangement of the present invention is formed by a cylindrical sheath which houses the heater coil. The sheath has an inner sleeve formed from a material having a relatively high thermal expansion and an outer sleeve formed from a material having a relatively low thermal expansion. The heater coil is positioned between the two sleeves. The desired clamping effect is produced by providing at least one axial slot in the inner sleeve. It has been found that during heating, the outer sleeve expands less than the inner sleeve due to the differences in the thermal expansion coefficients of the materials used to form the sleeves. This produces radial forces in the inner sleeve that are redirected into circumferential forces by the axial slot. These circumferential forces in turn cause the slot to close and thereby achieve the desired clamping effect.

Abstract: A nozzle arrangement for a fluid assisted injection molding apparatus has a central passage connected to an injection molding machine at one end and a section of the passage forming an outer sleeve at its opposite end. A channel at the opposite end of the nozzle connects the outer sleeve with an inlet runner leading to the mold cavity through which plasticized resin material can be injected. A pressurized fluid conduit coaxial with the nozzle forms an inner sleeve movable into and out of telescoping engagement with the outer sleeve for respectively blocking and opening the connection between the outer sleeve and its connecting channel. The conduit has a connecting passage, and it central passage is closed at its inner end.

Abstract: Injection molding apparatus for valve gating in which the valve member extends through a locating insert mounted at the front end of the nozzle. The locating insert has a pair of spiral blades extending inwardly from an outer collar. The spiral blades have curved inner edges which encircle the valve member sufficiently to maintain the valve member in accurate alignment with the gate as it reciprocates between the open and closed positions.

Abstract: Valve gated injection molding apparatus with a spring mounted on a central pin adjacent the head of a valve member in a spring chamber in each of the pistons. The spring is compressed between the base of the pin and the cap of the piston to preload it. When the valve member and piston are driven forwardly to the closed position, the head of the valve member retracts somewhat into the spring chamber against the force applied forwardly against the head of the valve member by the spring. This cushions the impact of the front end of the valve member in the gate and provides for tight seating of the front end of the valve member in the gate without requiring all of the components to be made to precise tolerances with exact allowance for thermal expansion. The spring is a number of selected disc springs stacked in sets facing in opposite directions, from which the force applied to the head of the valve member is predetermined.

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: An apparatus for gas assisted injection molding having a fluid forcing nozzle with a minimum of moving parts is shown. This apparatus produces an injected molded article by forcing a stream of molding material from a source of molten plastic through a fluid forcing nozzle into an article forming mold space. After the desired amount of material has been injected to fill the mold cavity, the flow through the fluid forcing nozzle is shut off, and replaced by a pressurized fluid or gas flow. The fluid forcing nozzle has an operable valve part operable between a first position and a second position. When the valve part is in its first position, a continuous flow channel from an injection molding machine to a mold sprue is provided for a molten plastic material. When the valve part is in its second position, a portion of the first flow channel is blocked, and a flow channel for an injection gas to the mold sprue is provided.

Abstract: A mold for hollow injection molding has an inlet for admitting a fluid into the molten resin when injected to form an interior hollow in the molded product. The inlet is opened and closed by retraction and advancement of a movable pin having at least a portion to fill the inlet and close it. When the inlet is closed, while the resin is being injected, the pin has a portion which projects out of the inlet into the space where the resin is injected. When the inlet is opened, the retraction of the pin leaves a short passageway in the injected resin leading from the fluid inlet for flow thereinto of the hollow-forming fluid. Preferably, the pin is stepped with an inlet-closing large rear portion and a smaller projecting forward portion which is located in and has an annular clearance with the inlet when it is open. The pin may be detachably connected to a movable plunger, operated by fluid or spring pressure, to enable replacement by pins of different lengths, sizes, etc.

Abstract: Apparatus includes a mold cavity and a molten plastic inlet channel for communication with the mold cavity for transmission of molten plastic to the mold cavity. A valve stem is provided with substantially no net resulting forces on the valve stem due to melt pressure acting on the projecting area of its upstream and downstream faces.

Abstract: In an injection molding machine, a skin layer resin 26 is injected from a first hot runner 10b into a cavity C in a mold or molds and then a resin passage between the first hot runner 10b and the cavity C is closed, thereby finishing the injection of the skin layer resin 26. A core layer resin 28 is injected from a second hot runner 12b into the cavity C in the mold(s) at a predetermined timing during the period between the start and end of injection of the skin layer resin 26, thereby molding a sandwich molded product without hesitation marks.

Abstract: A mold for making a double layer molded product, such as a molded product of sandwich construction or a hollow molded product having a dam within the mold cavity adjacent its gate. The dam projects in a direction transverse to that in which the inner-forming material is injected, and a gap is defined between the dam and the walls of the cavity. With this configuration, the core thickness of the molded product of sandwich construction, or the skin thickness of the hollow molded product, are made uniform.

Abstract: Valve gated injection molding apparatus for coinjecting and/or sequentially injecting two different fluids through a gate into a cavity. An elongated valve pin member is received in an elongated valve sleeve member in alignment with the gate and both are reciprocated rotatably as well as axially by separate actuating mechanisms to control the flow of the fluids through the gate. Each actuating mechanism has a piston driven rack member to provide rotary motion which is then converted to axial movement of the corresponding valve member between the retracted open and forward closed positions. In one embodiment, helical threads on the valve members engage fixed teeth extending inwardly from the surrounding nozzle to convert the rotary motion of each valve member to corresponding axial movement. Linear position transducers on the rack members provide for accurate control of the valve members.

Abstract: Apparatus for injection of fluids as, for instance, into a mold for the making of parts out of plastic or the like wherein the apparatus is self-aligning with the opening of the mold, a nozzle being moveable substantially automatically as the injection apparatus is moved into the inlet of the mold. The apparatus further includes a device for injecting a precise volume of such fluid, there being means for quickly and easily disassembling the entire injection apparatus for purposes of cleaning or repair.

Abstract: A nozzle for an injection molding machine with a common nozzle outlet chamber to control the injection of at least two plasticized plastic components in a mold, where each plastic component is produced in a separate plasticizing unit and each such unit is connected by the shortest path to at least one separate nozzle inlet which in turn is connected within the nozzle by means of a separate channel to the common nozzle outlet chamber. Each channel is provided with its own shutoff valve that can be actuated independently in such a manner that each infeed channel extends from its nozzle inlet in a straight line to the related shutoff valve, and from it in turn over an outfeed channel in a straight line to the common nozzle outlet chamber.

Abstract: A multi-station rubber injection molding machine including plural molding stations for respective molds, a rubber injection unit, and a manifold assembly for selectively transferring uncured rubber from the rubber injection unit to a mold in any one of the molding stations. The manifold assembly includes an inlet for receiving molding material from the injection unit and a plurality of nozzle members each including a transfer passage and being movable into and out of operative engagement with a mold in the respective molding station. Each nozzle member has associated therewith members for connecting and disconnecting the transfer passage therein to and from the inlet respectively in response to movement of the nozzle member into and out of operative engagement with the mold.

Abstract: System delivers a melt stream of moldable plastic material under pressure through a flow passageway into a mold cavity and includes a distributing plate including a distribution channel for conveying a plastic melt, a nozzle including a mold channel therein which communicates with the distribution channel and a mold cavity communicating with the mold channel. A connecting channel is provided connecting the distribution channel with the mold channel.

Abstract: A method of molding complex composite articles having skin portions containing fibres to be injected with a resin and a core portion includes providing one or more galleries in the core or fibre skin and injecting resin into the gallery or galleries whereby it is rapidly transmitted to all portions of the skin. The galleries overcome the resistance to flow created by the capillary nature of the fibrous layer and enable more rapid mold cycles to be employed and more complex articles therefore to be molded.

Abstract: A valve gate manifold for an injecting machine has at least three plates in tandem with one another, the first plate being circular and having in its several die positioning rings each with an injecting nozzle, the second plate being a manifold plate having a master valve and internal passages leading to the injecting nozzles, and the third plate carrying piston/cylinder assemblies which control the injecting nozzles. The face of the first plate can lie copolanar with the platen face of the injecting machine, and the manifold can be contained in an aperture through the platen.

Abstract: An apparatus for use in gas-assisted injection molding of plastic material so as to form an injection molded product includes a pair of mold members defining, when closed, a sealed cavity. A first opening is provided in one of the mold members for allowing the injection of a plastic material into the mold cavity and a second opening is provided in one of the mold members, and spaced from the first opening. A sleeve extends through the second opening. A probe extends through the sleeve and is adapted to be reciprocated therein from a retracted position to an extended position. The probe includes a first end adapted to selectively extend into the cavity, a second end and a longitudinally extending bore which terminates adjacent the second end. A reciprocating device is provided for reciprocating the probe in the sleeve held in the second opening of the one mold member in relation to the cavity.

Abstract: A valve gated injection molding system having an elongated valve member with an integral electrical heating element received in each nozzle to provide additional heat. An actuating mechanism engages the rear end of the valve member to reciprocate it between a withdrawn open position and a forward closed position. The valve member has a head which projects rearwardly from the nozzle. The heating element has an external terminal which extends outwardly from the head through a slot in a mounting sleeve. Thus, access for connection of an electrical lead to the moving terminal is provided between the fixed nozzle and the fixed cylinder of the actuating mechanism.

Abstract: Injection nozzle for use in a device for moulding an object of a thermoplastic material in an injection mould, comprising a nozzle with a feed channel (4) running through it which connects at the bottom end to a jet passage (7) and at this end has a ball-shaped closing element (9) which can be turned by means of control means (11, 12, 13) from a position in which the inlet aperture of the jet passage extending through the member (9) coincides with the end aperture at the bottom end of the feed channel to a position in which said inlet aperture lies entirely outside the above-mentioned end aperture, so that the end aperture of the feed channel is blocked by the member.

Abstract: The valve needle of a gas sealing valve for plastic processing plants may be controlled by a control valve, which in turn is controlled by a working gas volume in order to prevent formation of internal waviness in injection molded articles even under very high gas pressures and to assure high flexibility in production without refitting delays. During plastic mass injection the valve needle seals tightly. During gas return the valve needle remains open until the gas bubble in the mold cavity is completely emptied.

Abstract: An injection mold has a valve gate system in which a valve pin is moved through a runner into and away from a gate to open and close the gate. The valve pin is inserted into the gate to close it after each injection stroke and the end face of the valve pin defines a part of the surface of an injection-molded article when the valve pin is in the gate. The end face of the valve pin is provided with a designed irregularity.

Abstract: An arrangement is disclosed for independently controlling shutoff and flow to a cavity gate in a multicavity injection mold apparatus, in which a plurality of valve pins are mounted to a movable holder plate, each aligned with a cavity gate and movable thereinto to control shutoff and a plurality of fixed position plunger sleeves are each mounted over a respective valve pin and adjustably positioned with respect to a restriction feature in the supply passage upstream of the associated gate.

Abstract: Injection molding apparatus is disclosed having an actuation system for operation of a shut off valve pin, movably mounted in a valve gate, the system including a first gear rack connected to the valve pin, a first pinion gear driven by the first gear rack connected at one end of a cross shaft, a second pinion gear at the other end of the cross shaft, and a externally mounted two way power cylinder operating a second gear rack to rotate the second pinion gear in mesh therewith so that both pinion gears rotate together, and the valve pin is reciprocated by operation of the power cylinder. The power cylinder is mounted for angular adjustment about the axis of rotation of the pinion gears and cross shaft to enable ready adjustment of the closing position of the valve pin in the valve gate.

Abstract: The present invention relates to an apparatus for injecting viscous materials. The apparatus includes a vertically adjustable manifold valve which receives a continuously circulating supply of pressurized viscous material. The manifold valve is positioned above a container or mold cavity to be filled with the viscous material. When the manifold valve is opened, the viscous material is injected into the containers or molds.