Abstract: Apparatus and method for producing a die cast article, such as a gear wheel having helical teeth, in which the die cavity is defined by fixed elements and a rotatable element. On completion of the casting the cast article can be ejected from the casting cavity on relative rotation between the fixed elements and rotatable element so that the cast helical teeth of the article can be removed in an undamaged condition.

Abstract: A mold for molding a boot or similar footwear from an elastomeric composition and simultaneously lining the footwear with a fabric, has first and second shells each having a cavity which complements the cavity of the other to form a large cavity which corresponds to the upstanding sides of the footwear and a third shell which has a cavity corresponding to the sole thereof. The three shells are assembled together with a rigid core member enclosed therein which defines the inside of the boot. The core member has an elastically expandable casing. Conduits are arranged in the core member for conveying a fluid under pressure to expand the casing.

Abstract: The invention is a process for manufacturing an irradiation cross-linked molded article by utilization of molding apparatus wherein at least a portion of the molding apparatus is separable and capable of withstanding irradiation.

Abstract: Disclosed herein is a radially parted mold comprising a plurality of mold segments each having cavities that taken together define the shape of a propeller with a tapered hub when the mold segments are joined together along their parting surfaces. The parting surfaces include parting lines which run along the edge of the propeller blade. The edge of the propeller blade is the centerline of the blade (1/2 the thickness of the blade). There are the same number of mold segments as there are blades on the propeller and each mold segment has a first cavity defining the rear face of an adjacent propeller blade, a second cavity defining the rear face of an adjacent propeller blade, and a third cavity defining a portion of the propeller hub.

Abstract: A two-step ejector structure for molds for injection molding and the like has a first ejector member arranged to be directly acted upon for ejection and to act upon an ejector pin carrier which is to be displaced in the first and second ejector steps, and a second ejector member acting upon a second ejector pin carrier which is to be displaced only in the first ejector step, and a coupling to accomplish the movement of the second ejector member during a predetermined first portion of the ejector movement of the first ejector member and thereafter release the first ejector member from the second ejector member and lock the second ejector member to a member securedly connected to a tool.

Abstract: An embossed article such as a plastic bowl is injection molded between the molding surfaces of an unidirectional mold. The outer molding surface is inclined outwardly from bottom to top and is provided with an engraved area in which the boss is formed. The undercut upper edge of the engraved area is slanted in a manner to provide an inclined lead in surface on the boss. The undercut of the lead in surface is slight enough that the boss is able to release from the engraved area without damage as the mold opens in unidirectional fashion for removal of the molded article.

Abstract: A molding method and apparatus is described for the formation of plastic coin holders characterized by a generally C-shaped body in which portions of the male and female mold parts are moved relative to each other to permit the coin holder to be sprung off the male member.

Abstract: A stop boss formed on the handle of a pail may be simultaneously molded along with the pail and its handle by means of a pair of pivotable members which have free ends abutting together in a first pivoting position, and which are spaced from each other in a second pivoting position. The free ends cooperatively define between them a mold cavity for forming the stop boss on the rotatable handle. The pivotable members are adapted to occupy their first pivoting position while the mold assemblies close, and to pivot into the second, open pivoting position upon opening of the mold assembly and removal of the molded part to facilitate removal of the stop boss.

Abstract: A mold for manufacturing silicone contact lenses is provided. The mold comprises a male section and a female section plated with chromium or nickel which when joined together come into contact with each other only at a portion at which the mold surface of one section becomes continuous with that of the other section to define a cavity therebetween. The contact between both sections is not in a flat-to-flat fashion but in a line or edge-to-edge fashion so that a contact lens whose surface and edge are completely freed from flashes or irregularities can be obtained. Further, with the use of chromium or nickel plated mold of the present invention, a contact lens of excellent quality can be obtained from a silicone resin which is affinitive to chromium and nickel.

Abstract: Disclosed is a device which is utilized for forming the removable nosepiece by forming a molded impression of a portion of a person's nose with the impression being used to then form the nosepiece for the person's eyeglass frames. The molded impression device comprises generally a mold for retaining a predetermined quantity of a molding substance along with a frame for retaining the mold and means for removably attaching the mold to the frame. There is also disclosed the mold for using with the molding device as well as the method for forming a molded impression with a molding substance of a person's nose for use in forming the removable nosepiece of the subject invention.

Abstract: An expandable core for forming an internal recess in a molded part, composed of a stationary core pin having a generally conical outer surface and a segmented sleeve composed of two groups of lateral slides disposed around the pin with the slides of one group alternating with the slides of the other group. The conicity of the pin outer surface and the slide guidance along the pin are identical for all slides of the same group but are different from one group to the other.

Abstract: An article expanded at the center portion and having the maximum diameter at said portion, for example a ball-shaped flexible tube joint, is produced by using a mold consisting of a main mold having the same inner surface as the outer shape of said article, a cover mold provided with an elastic core having the same outer shape as the inner shape of the above described article and provided with a hollow cavity in the inside of the core, and a bottom mold provided with a projection, which detachably fits in the hollow cavity in the core, the main mold being put between the cover mold and the bottom mold, and a cavity having the same shape as the article to be molded being formed by the cover mold, the elastic core, the main mold and the bottom mold, and by pouring a liquid elastomer into the thus formed cavity and hardening said liquid elastomer.

Abstract: A mold for forming a plastic article having an undercut or negative draft portion adjacent a narrow wall spacing, such as a card rack, wherein the hollow projection extends outwardly from an article wall which is substantially normal to a rear wall of the article so that the projection and the rear wall are in facing relation. The mold is particularly adapted for vacuum forming an article and includes a mold member that may be heated and cooled to form and release a plastic article and a frame for holding peripheral edges of a plastic sheet in overlying relation with the mold and a heater for heating the plastic sheet for vacuum forming to the shape of the mold.

Abstract: Apparatus for forming a powder metal compact having an undercut or a reentrant angle in which the portion of the die that results in the compact undercut or reentrant angle is axially movable relative to a stationary part of the die means along the axis of pressure in order to permit automatic straight line ejection of the compact.

Abstract: Three-dimensional articles are molded from materials capable of flow utilizingA. a molding zone having a plurality of advancing contiguous molds with adjacent molds forming mold cavities at contiguous interfaces transverse to the direction of motion.B. a discharge zone following the molding zone wherein said molds travel in an arcuate path, become separated from each other and the mold cavities are opened;C. feeding a material capable of flow to the molding zone, forcing same into said mold cavities and solidifying same therein; andWithdrawing said molded articles from the discharge zone.

Abstract: Molding apparatus for molding articles without a seam or parting line even though the molded articles may have severe backdraft portions. The apparatus includes a one-piece flexible mold which is deformable subject to the application of fluid pressure, a vacuum pot large enough to accommodate the flexible mold therein and means for applying vacuum to the pot such that the mold may be expanded by the vacuum thereby releasing the molded article. The vacuum pot is provided with upwardly extending projections positioned in the bottom of the pot and the mold is provided with a restraining ring member for supporting the mold wall and for acting in conjunction with the upwardly extending projection to control the mode of expansion of the mold.

Abstract: The specification and drawings disclose an apparatus for permitting molding of components such as turbine blade assemblies and the like without the use of complex multipart molds. The disclosed apparatus comprises first and second mold halves carried by cooperating platens for relative movement toward and away from one another along a path. A connecting assembly is provided for attaching the first mold half to its respective platen in a manner which permits it to have free movement in directions perpendicular to the path and rotary movement about an axis parallel to the path. Additionally, a control assembly is provided to cause the first mold half to undergo predetermined transverse and rotary movement during movement along the path toward and away from the second mold half.

Abstract: An apparatus for molding plastic sheet and the like by a thermoforming process, wherein an overhanging hollow portion is formed in the molded sheet by a retractable mold portion having a plurality of resiliently connected elements which may be moved relative to each other as the mold portion is withdrawn from the overhanging, formed sheet portion. In the illustrated embodiment, a plurality of spring means are provided for providing different positioning functions in arranging the movable mold portion in the desired configuration.

Abstract: A panel constructed cabinet for refrigerators, freezers or the like is disclosed along with a method of manufacture and an apparatus for manufacture. The cabinet includes an inner liner formed of panels of thermoplastic material having mating edge connections. The connections are formed by heating the plastic sheet along spaced and parallel lines adjacent to the edges thereof, to provide fold lines permitting the formation of channels proportioned to receive mating tongues from adjacent panels. Along some edges of the thermoplastic panels the channels are formed to extend laterally, with respect to the panel, and along other edges the channels are formed substantially parallel to the panels. The outer casing includes a combination of metallic panels along the sides and foil laminated panels along the top, back and bottom of the cabinet. Foamed insulation rigidifies the panels and provides the necessary insulation therebetween.

Abstract: A core is provided, useful in the manufacture of closure caps, each closure cap having a top, dependent skirt and securing means, comprising intermittent or interrupted threads or hold-down lugs.

Abstract: In the injection molding of undercut and continuously slotted duct sections from a plastic material where a multi-part mold structure including a core is used, the core of the mold structure is removed, after the injection molding operation, by cooling the plastic material used to a temperature below its softening temperature, releasing the bearing contact of the mold supporting the lateral exterior of the duct section and the exterior base of the duct section, providing a bearing contact with the surface of the duct section upwardly from its base with the bearing contact affording a force restraining the duct section from movement in the direction outwardly from the slotted opening of the duct, and pulling the core outwardly through the continuous slot while the bearing contact with the duct section holds it against displacement due to the pulling action.

Abstract: Complemental male and female mold sections are supported in spaced relation to define a cavity that has a molded corresponding to the shape of the article to be molded, the mold sections being relatively movable away from one another to afford ejection of a completed article. A recess in the surface of at least one of the mold sections in a wall thereof generally parallel to the direction of the mold separation. An ejector bar sized to fit within the recess, the ejector bar having a surface discontinuity that is the mirror image of a surface discontinuity to be formed on the wall of the molded article. Means for moving the ejector bar along an oblique path after the mold sections are separated so that the ejector bar performs the dual function of separating the molded article from the mold section and effecting disengagement between the surface discontinuity on the ejector bar and its mirror image on the molded part.