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 mix head bushing including a body portion having first and second ends. The body portion includes a flange extending radially outwardly from the first end thereof and an essentially conical passage extending therethrough to define a first opening at the first end of the body portion and a second smaller opening at the second end of the body portion. The body portion further includes a second flange having an inner edge extending radially inwardly partially over the second opening. A resilient coating is adhered to the body portion in the passage and extends inwardly beyond the inner edge of the second flange.

Abstract: Mold nozzle for injecting plastic material, constituted by a cylindrical body forming sleeve, associated with a heating device and integrated in a receiving housing provided in the thickness of a mold. The nozzle opens out via a downstream orifice in the interior of the mold and is adapted to receive via its upstream orifice, opposite the preceding one, the flux of material injected from the molding machine nozzle. The mold nozzle is constituted by a first fixed cylindrical sleeve (3), which is immobilized on the wall of the mold and acts as the upstream orifice for the admission of the material. The nozzle has a second mobile sleeve (4), colinear with respect to the first sleeve, and mounted to slide telescopically inside of the first sleeve. The end (5) of the second sleeve, opposite of the end engaged in the first sleeve, comes into abutment against the wall (9) of the receiving housing (8) provided in the thickness of the mold (2).

Abstract: A nozzle utilized to grout or fill cold joints and cracks formed in or occuring at structural corners. The nozzle includes a tip which is defined by converging planar surfaces about an axial opening. The nozzle tip defining surfaces include a relatively large area which is separated from the nozzle axial opening for wall contact to permit the nozzle to be secured by an adhesive or bonding agent to the corner walls before injection of the grouting material or sealant.

Abstract: A fixing in a wall is made by drilling a hole, inserting the pin of a nozzle mounted on a hot melt gun into the hole and injecting molten polypropylene into the space between the pin and the hole. The polypropylene is allowed to solidify and the nozzle is removed leaving a wall plug ready for the insertion of a screw. Three embodiments of a nozzle especially adapted for use in this process are described. nozzle has a hollow screw-threaded base with a pin extending forwardly therefrom. Passageways in the base each communicate at one end with the interior of the base and at another end externally of the base and the pin in the vicinity of the junction between the pin and the base. A flexible seal is slidably mounted on the base and resiliently biased towards the pin.

Abstract: This invention relates to a manifold housing for a valve gated single cavity injection molding system. The heated manifold housing has a dome portion and a base portion which is secured to a heated nozzle with aligned central bores through which the valve pin extends. Hydraulic actuating mechanism is mounted inside the manifold housing to reciprocate the valve pin between open and closed positions. The melt duct in the manifold branches from a central inlet into two separate arms with smoothly curved bends which extend to join the central bore on opposite sides of the valve pin. Providing two streams of melt which meet at the valve pin avoids the problem of streaking and slow melt flow on one side of the valve pin.

Abstract: The injection nozzle has a central heating rod (1) and jacket components (2 and 3), with the heating rod connected at the upper end with one (3) of the jacket components and at the lower end, through a fork (8), with the other (2). The jacket components are electrically insulated from each other by disks (4 and 5) and demarcate an annular channel (15) for the plastic to flow through. The plastic is introduced into the channel at the top and through exits (14) at the bottom into the supply aperture of an injection mold. The nozzle has two points (11) at the bottom, each extending into or into the vicinity of one supply aperture to a mold cavity. Two mold cavities can accordingly be simultaneously filled with plastic by one injection nozzle.

Abstract: This transfer nozzle consists of a nozzle body with a disk type cylindrical center part (21) and two axial nozzle cones (22,23). On a part of their height the nozzle cones (22, 23) are embraced by a sleeve-like collar (25, 26) and within the collars there are several axial passage openings (27, 28). A radial passage opening (30) through the center part (21) serves to receive a heating cartridge. The nozzle body (21, 22, 23) is supported by means of the outermost portions of the two collars (25, 26) on the one hand in the supporting basket (2) and on the other hand in the tool part (5), so that little heat can be lost to the cooled machine parts. The nozzle cavity (11) forms an air cushion around the center part (21) which also has a heat-insulating effect. Such a transfer nozzle has a low structural height and can keep the molding material warm from within, and by the axial arrangement of two nozzle cones the material is ejected with each molding.

Abstract: Disclosed herein is a hot nozzle for use with a mold for runnerless injection molding of plastic material. The hot nozzle includes a body formed of a conductive metal having a predetermined electrical resistance. The body has a nozzle portion and a base portion, and has a pair of diametrically disposed longitudinal slits extending substantially over the length thereof except at least a portion of the forward end of the nozzle portion in such a manner as to divide the nozzle portion substantially into two sections. The base portion has on opposite ends separated by the slits a pair of power receiving mechanisms for connection to an external source of power. With this arrangement, the nozzle portion itself, particularly at the front end thereof, is heated by voltage applied across the opposite ends of the base portion.

Abstract: A nozzle for a die casting machine of the type having mold halves that move toward and away from the parting line and engage a nozzle located on the parting line. The nozzle is free to "float" a limited amount on its surface mounting so as to assume a correct location at every shot in response to the die inserts closing around it. The nozzle also has a frusto-conical surface on the exit end of its aperture to provide a clean breakaway after a shot is made and only a small contact area is provided on the nozzle for engagement by the molds to reduce heat transfer thereto from the nozzle, moreover the structure increases specific superficial pressure between the nozzle area and the mold insert area in order to crush any metal debris that accumulates during the casting operation.

Abstract: This invention relates to an improved valve gated injection molding system in which the heated nozzle has a nose portion which extends through a cylindrical opening in the cavity plate to the cavity. The valve gate extends through the nose portion and is tapered so that the forward face of the nose portion can be machined to a predetermined length to provide a gate of a particular size. This has the advantage of improving heat transfer to the gate area and reducing the accuracy required of the moldmaker in that both the valve pin and the matching seat in the gate are provided by the manufacturer. Furthermore, each size of nozzle can be adapted for several different gate sizes which reduces manufacturing and inventory costs.

Abstract: An injection press for forming a mass of plastic material to a desired shape comprising a die carrier plate for supporting a mold having an injection channel formed therein at a location corresponding substantially to the location of the optimum injection point, said die carrier plate having a plurality of bores therethrough arrayed in an X-Y coordinate field; a press plate parallel to said die carrier plate and having a plurality of bores therethrough aligned with the bores in said die carrier plate in said X-Y coordinate field; means interposed between said die carrier plate and said press plate for injecting plastic material into a mold; a closing rod extendable through a pair of aligned bores in said die carrier plate and said press plate, through said interposed injecting means and through the injection channel of a mold on said die carrier plate to force plastic material into the mold; said injection means and said closing rod being selectively positionable in said X-Y coordinate field so that the closi

Abstract: An injection liner for use as a borehole closure in masonry or solid rock provides a passageway for injecting plastics material into a prepared borehole for sealing cracks or fissures in masonry or solid rock. The liner is a unitary shaft having a frusto-conically shaped outside surface arranged to be fitted into the prepared borehole. The shaft is a tubular member and provides an axially extending bore through which the plastics material is forced. A nipple is threaded into the larger diameter end of the shaft so that a hose for the plastics material can be connected to the nozzle for flowing the plastics material into the bore through the injection liner.

Abstract: This invention is an improved injection molding nozzle whereby the shut-off plunger is operated by a fluid and the opening of the nozzle is accomplished by the flow of plasticized material through the nozzle. A control rod internal to the nozzle controls the movement of the plunger shut-off member and is adjustable so that the amount of plasticized resin flowing through the nozzle can be accurately controlled.

Abstract: In a method for the injection molding of a plastic blind rivet of the type essentially consisting of a shank and a rivet body such that an upward slide of the shank relative to the rivet body causes the leading end of the rivet body to expand outwardly and the outward expansion of the rivet body enables the rivet to be fastened to a panel, the improvement which comprises forming a ring gate in the lower end of the cavity of a second die used for molding a rivet body around a shank molded in advance in a first die, whereby the molten plastic material for the rivet body is allowed to flow through the ring gate into the rivet-body cavity of the second die with high uniformity, whereby the rivet body is produced free from a weld line and consequently from the possibility of sustaining cracks under the force exerted thereon when the shank is slid upwardly therein.

Abstract: This invention relates to improved mechanism for actuating injection molding valve pins. In one embodiment, the mechanism is located between two parallel rows of valve pins located in a common plane with their driven ends adjacent the mechanism. The mechanism includes a central elongated member which is longitudinally reciprocable and two parallel elongated transversely reciprocable side members, each located between the central member and one of the rows of valve pins. Each of the side members is connected to the central member by a number of spaced pairs of pivotally connected pins and the central member is secured against transverse motion, while the side members are secured against longitudinal motion. Therefore, the side members are reciprocated transversely when the central member is reciprocated longitudinally by a hydraulic cylinder.

Abstract: An improved injection mold apparatus and method includes a gate interposed between a mold chamber or cavity and a runner passageway. The cross sectional opening of the gate is non-circular in shape and may comprise a plurality of foliations. The non-circular shape of gate opening enables the provision of sufficient area to insure adequate filling and compacting of molding material in a mold chamber within a reasonable time interval and also avoids difficult problems such as drooling, stringing, and/or freeze-off or blocking of material-supply passageways.

Abstract: A method and apparatus for the injection molding of plastics wherein the sprue bushing is provided with a plurality of grooves in its bore as contrasted with the conventional sprue bushings having smooth bores. The sprue formed is complementarily ribbed and these irregular surfaces speed cooling of the sprue and facilitate manual handling thereof.

Abstract: This invention relates to an improved seal for injection molding mechanism. The lower nozzle portion of a heater with the reciprocal valve pin extending centrally therethrough extends downwardly to the gate in the mold. The generally cylindrical seal is horizontally located in an outward upward flare of the air space between the lower nozzle portion and the mold. The seal has a V-shaped lower surface which provides inner and outer circumferential lips which prevent the pressurized melt from flowing upward past the seal. The outer wall of the seal extends across the flare of the air space with only a portion of the outer lip abutting on the mold, thus substantially reducing heat loss from the heater through the seal to the cooled mold.

Abstract: This invention relates to a nozzle seal to be used in multi-cavity valve-gated injection molding. A heater cast with a lower nozzle portion is spaced from a cavity plate by an insulating air space and the valve pin reciprocates vertically in the heater cast bore into a gate in the cavity plate. A hollow generally cylindrical nozzle seal is provided across the air space between the lower tip of the nozzle portion and the cavity plate around the gate. The cylindrical seal provides additional heat transfer from the heater to the area of the gate to facilitate operation of the valve pin, particularly seating of the valve pin in the gate, during molding of certain plastic materials with high temperature characteristics. The nozzle seal is formed of a high yield strength titanium alloy and structured to avoid leakage or breakage in this critical area due to high injection pressure and both vertical and lateral relative movement between the nozzle and the cavity plate due to thermal expansion and contraction.