Abstract: An apparatus for manufacturing fluid seals, which includes first and second mold parts movable along a given axis between open and closed positions. One mold part has a radially extending mold surface adapted to receive and support one surface of the flange portion of an insert to which a molded part of the seal is to be bonded, and the other mold part has a portion adapted to engage an opposite surface of the flange to hold the flange against the receiving and supporting mold surface to prevent leakage of fluid material from said cavity along the flange.

Abstract: A normally rigid plastic pipe is shaped by softening a selected zone of the pipe, inserting into the softened zone a resiliently deformable mandrel and pressing axially on opposite sides of the mandrel. This expands the mandrel radially into frictional engagement with the softened pipe zone. Contemporaneously the mandrel is shortened axially, thereby correspondingly expanding radially and shortening axially the softened portion of the pipe while proportionately thickening its side walls.

Abstract: A plurality of molds, each consisting of a pair of relatively movable mold halves, are mounted on a turntable equidistant from the center of turntable rotation, and are moved successively through a receiving sector where they engage and grip a workpiece such as a heated tube fed tangentially to the circular path of movement of the molds. Positioning pillars located on each side of a workpiece cutting device mounted between adjacent molds, engage the workpiece and correct the attitude thereof relative to each receiving mold and to each cutting device, which also is equipped with means for gripping the cut ends of the workpiece when each mold is opened at the end of the molding cycle.

Abstract: A continuously operable press utilizing facing endless linked together platen belts for compressing chip materials into chipboards, fiberboards, and the like. A plurality of pressure rollers are provided along the belts for pressing the same towards one another along the portion of their travel paths where they are in facing relationship. With the belts travelling horizontally at the position of their facing runs, these pressure rollers are biased by piston-cylinder apparatus or the like in a vertical direction. For accommodating adjustment of the position of the pressure rollers in the horizontal direction, without necessitating stoppage of the press, needle bearings are provided between supports for the bearings of the pressure rollers and the fixed press frame. Adjusting means in the form of piston-cylinder apparatus are provided for effecting the horizontal adjustment of the bearing supports for the pressure rollers.

Abstract: An installation for forming a tube of thermoplastic material with a socket having an external bead thereon, by pushing the tube end on a mandril consisting of two, spaced apart, axially movable mandril parts, and moving the two mandril parts towards each other while the outer surface of the tube is gripped by a mould having an internal recess corresponding to the bead to be formed on the tube. Compressed air, a compressible expandable rubber body, die or an inflatable rubber body is present in the space bounded by the two mandril parts and the inner surface of the tube. The length of the tube between the two mandril parts in their initial position is at least equal to the length of the bead to be formed.

Abstract: Candles are cast in multiple, tubular, upright molds set in a housing having a normally horizontal top plate, the molds having spherically arcuate top end portions which slightly project beyond the top plate so that a unitary body of molten wax which initially fills the molds and covers the top plate shrinks during its solidification sufficiently that the top end portions of the molds are exposed, and the wax in the molds pulls away from the wax on the top plate, whereby manual finishing of the candle ends may be avoided.

Abstract: An apparatus and method for forming uniform patties from a mass of agglomerable edible material. The apparatus includes a supporting frame, drive means for operating the apparatus, a hopper, and a rotatable turret including a plurality of cavities radially aligned therein. Each cavity has a barrier means mounted for reciprocal movement therein including a working surface which together with a portion of the cavity forms a mold. Means in said hopper moves material therethrough and into each mold as it is rotated on the turret to a position in communication with the hopper. The patty is formed as the turret continues rotation and then the mold moves out of communication with the hopper. The barrier means reciprocates in the cavity and discharges the patty therefrom while maintaining its shape as formed The barrier means is removable and may be combined with a stationary core for changing the shape of the mold.

Abstract: An improvement for pellet mills for resolving the radial forces which develop between the die and the rollers. An extension is provided on the main shaft extending beyond the roller support frame arms, and a bearing assembly is mounted on the extension for supporting a spider connected to the die cover.

Abstract: An apparatus for at least partially forming a brassiere having a pair of male molds provided with substantially conical outer surfaces, which molds are movably supported on a first support device so that the spacing between the molds can be selectively varied. A die assembly is spaced opposite the molds and has a pair of circular openings extending therethrough, which openings are aligned with the molds. Clamping devices are provided for supporting a sheet of flexible material adjacent the die assembly so that the material extends across the openings. A driving device, such as a pressure cylinder, causes relative reciprocating movement between the die assembly and the molds, as by being connected to the molds, so that the molds are linearly advanced toward the die assembly so that the molds project through the openings in the die assembly and deform the material into a pair of cups. Heating means are associated with the apparatus for causing heating of the deformed material.

Abstract: A combination injection means, mold handling apparatus, and mold is disclosed which is capable of being attached to a conventional compression style press without undue modification thereof to thereby greatly enhance the efficiency thereof. The invention includes an injection cylinder and bracket means for attaching the same to the frame of the press without modification thereof and a manifold associated with the injection cylinder. A multi-plate mold structure is also disclosed which is capable of being incrementally indexed into and out of the press and also indexed into position for filling by the injection cylinder. Alternate mold assemblies are provided so that one can be located interiorly of the press for curing purposes, while the other is being stripped. A runner system is also provided in the manifold to enhance the efficiency of filling multiple mold cavities with a minimum of waste, and also means are disclosed for separating the press for removal of the cured part.

Abstract: Apparatus for bending rigid extruded thermoplastic resin shapes without significant deformation of the cross-sectional configuration of the shape is described.The bending apparatus includes a rigid die member which has a convex die surface configured to mate intimately with a portion of the cross-sectional configuration of the shape to be bent prior to and during the bending process. The convex die surface defines the desired curve to which the shape is to be bent. A flexible die is configured to mate intimately with substantially the remainder of the cross-sectional configuration of the shape. Heating fluid passages are provided through both the rigid and flexible dies for application of a heating fluid, preferably saturated steam where the shape is made of rigid vinyl, directly to the shape for conditioning of the shape for bending.

Abstract: An injection moulding machine used in conjunction with a closed split mould, has its shot volume controlled by a device which responds to widening of the mould parting line occurring when the mould is completely filled with moulding material as a result of the pressure build up which occurs inside the mould. Contactless sensing of widening of the parting line is described, by means of electromagnetic sensing devices. The shot volume can thus be held at the optimum value at which minimum flash occurs and complete filling of the mould is assured.

Abstract: Method and apparatus for the preparation of oriented hollow objects of moldable organic plastic material by providing a parison on a first blow core, expanding said parison into an intermediate shape, as by pre-expanding it, transferring said pre-expanded parison to a second blow core, finally extending and expanding said parison to form said hollow object in finished shape.

Abstract: Apparatus for molding, in a single integrated operation, a tubular part having an internal recess which may take the form of a groove extending completely around the inside of the part for receipt therein of an O-ring or the like. The apparatus comprises a core assembly having a longitudinal axis, and base means movable along the axis and defining an annular outer mold surface for forming of the interior wall of the tubular part. The core assembly further includes a plurality of groove-forming segments carried on the base means adjacent to the annular surface and movable between first contracted positions and second expanded positions. When the segments are in the contracted positions they do not extend radially outwardly of the annular surface, and the surface and segments may be withdrawn from the molded tubular part by movement along the longitudinal axis.

Abstract: An apparatus for vacuum embossing sheet thermoplastic material which utilizes an endless, seamless structure as the embossing surface. A sheet of heat-softened thermoplastic film is passed over an embossing screen, the embossing screen being supported by a support roll, a drive roll and two seal rolls. A vacuum is applied to the screen between the seal rolls to pull the film into contact with the screen thereby producing an embossed pattern on the film corresponding to the outer surface of the screen. After the film is removed from the endless, seamless screen the film is cooled to set the pattern in the film. The process produces an embossed film which has high strength, low surface gloss or light reflectance, and a deep embossed pattern.

Abstract: In a blow-head for producing tubular film from thermoplastic molten material and comprising a housing with a central supply conduit for the molten material, distributing passages radiating from the supply conduit to a respective distributing helix of an insert member, and means for internally cooling the blown film, said cooling means comprising concentric air inlet and outlet passages extending axially of the housing and each connected to at least one inlet tube and one outlet tube, respectively, the said tubes being disposed between adjacent said radiating distributing passages and extending to the exterior of the housing, provision is made for forming the film of at least two layers having different properties by making the said insert member tubular and providing in it at least one coaxial further insert formed with further distributing helices each of which is fed with further molten material from a further supply conduit through further distributing passages, the said insert member terminating in an ann

Abstract: A method of and calender for calendering synthetic plastics film, particularly PVC film, wherein the total roller looping distance of the film around the rolls of the calender is reduced having regard to known five-roll calenders by providing that the material to form the film is fed into a roller gap between a first roller and a third roller, with the first roller set at the same height as the third roller, the film is looped around the third roller for three quarters of the circumference thereof and, during such looping, passes through a second roller gap between the third roller and a second roller disposed beneath the third roller and through a third roller gap between the third roller and a fourth roller disposed above the third roller, the film then being looped around the fourth roller for three quarters of the circumference thereof and, during such looping, passes through a fourth roller gap between the fourth roller and the fifth roller mounted above the fourth roller, the calendered film then being

Abstract: An apparatus for forming and cutting thermoplastic sheets comprises a heater platen and base plate assembly with a toggle leverage assembly which brings the base plate assembly into and out of a closed relation with the heater platen with a sheet of thermoplastic material therebetween. The base plate assembly has a strip of elastic material mounted thereon, one or more mold (forming) sections, cutting blades defining the peripheral outline of the mold sections and a seal-off plate slidably mounted on the base plate assembly and resting on the elastic strips.

Abstract: A method and apparatus are provided for multiple simultaneous blow molding operations for forming hollow objects such as containers, the method and apparatus employing at least two circumferentially spaced parison forming means with a single rotary indexing turntable. A first container is formed at one station and a second container is formed at about the same time at a second station circumferentially spaced from the first station, and the containers are simultaneously circumferentially transferred to an unloading station. The method and apparatus provide for multiple container forming and unloading operations on the same turntable. Different containers may be manufactured at the same time with one rotary indexing turntable.

Abstract: In an ejector pin assembly for injection moulding tools the ejector pin plate is positively retracted and locked in its rear position by providing the tool with a rearwardly extending hollow housing, having an inner annular pocket, by slidably arranging in said housing a slidable member, being connected to the ejector pin plate and having radial holes for receiving cupling elements such as balls, segments or the like, by arranging in said housing a spring operated member, which normally prevents the coupling elements from penetrating said sliding member inwardly and by securing to the generally stationary ejector means of the injection moulding machine an ejector rod, which near its free end has an annular groove into which said coupling elements may enter when said rod has been introduced in the housing and the spring operated member as a consequence thereof has been displaced such that it does not any longer cover said openings.