Abstract: Polybutylene tubing is flared by a method and apparatus wherein the tubing is clamped at a position spaced from the end to be flared, and the projecting end portion is progressively engaged by a rotating flaring member having a working face of special segmental configuration such that as it advances into the tubing, an undulating circulatory pattern is developed in the tubing material accompanied by expansion thereof into the desired flare.

Abstract: Collapsible core assembly having retractable portion capable of producing plastic parts having an undercut. The core assembly comprises a segmented portion operably connected to an innercore pulling assembly whereby operation of the innercore pulling assembly first retracts the segmented core and thereafter pulls the complete core assembly out of the molded part.

Abstract: A tubular parison of synthetic plastic material in thermoplastic condition is extruded into a travelling mold wherein it is formed into a corrugated tube. The travelling mold is formed when cooperating mold sections of two endless strings of such mold sections move together and travel for some distance in a straight path before moving apart again. Each mold section has front and rear guide rollers which travel in guide channels that are so configurated as to impart to the mold sections the aforementioned movements toward and away from each other.

Abstract: The present invention relates to a device for shaping and cooling a smooth thin wall pipe, obtained from extrusion of a thermoplastic material, into a corrugated pipe shape.The most common technology to produce plastic corrugated pipe uses a series of split molds carried by two continuous chains, the split molds locking around an extruded smooth pipe which by means of a slight positive pressure is forced against the inside walls of the molds (which travel at extrusion speed) therefore shaping the hot plastic pipe into a corrugated shape. At the same time excessive heat is dissipated by a forced flow of air passing over the outside surface of the molds. This system requires a great number of molds and therefore machines of great encumberance.

Abstract: A curved hose molding device which includes a curved mandrel with a fixed collar near one end and a removable elastomeric collar near the opposite end, the collars defining means for molding the ends of a hose carcass a desirable length apart.

Abstract: Apparatus for forming fibers of refractory materials. A melt volume is continuously formed on a feed rod of the material to be fiberized and a fiber drawn therefrom. The melt volume is formed by introducing the feed rod at a predetermined velocity into a heating zone. The fiber diameter is determined by the relative velocities at which the feed rod is moved and the fiber drawn, and by the fractional density of the feed rod material.

Abstract: An attachment for a plastic pipe bending machine for automatically and precisely enlarging the end portions of formed plastic pipe for interconnection with other like plastic pipe of same outside diameter.

Abstract: An apparatus for reforming pipe ends by belling or the like. The apparatus includes a support structure which has a heater movably mounted thereon and is movable between a pipe end heating position and a second position remote from the heating position. A clamp is provided to hold the pipe in position during heating and forming. A forming mandrel is carried by power operated moving means which selectively moves the mandrel into forming engagement with an end portion of the pipe and after forming of the end portion the mandrel is retracted from engagement therewith. Cooling means are also provided to cool the formed pipe end portion.

Abstract: Apparatus for continuously producing seals in tube-shaped plastics film material, comprising means for supplying the web of material, at least one heating beam travelling along with the web and subsequently returning, means for keeping the web mechanically tension-free at the location where it is warm, means for keeping the heated film layers one against the other up to a pressing station, said pressing station comprising two rollers at least one of which is provided with cooling means, and means for discharging the web. A plurality of heating beams being provided which are interconnected by flexible and longitudinally adjustable means such as belts so as to form an endless loop which is guided over and driven by appropriate adjustable tensioning rollers.

Abstract: The discharge device of this invention serves to receive axially compressed radially self-sustaining tubular duct in a cartridge form substantially shorter than the fully extended length of the duct and has a restraining collar on an exit end of the discharge device which effects a hoop tension on the compressed core during its passage from the exit end of the device to apply a controlled frictional drag ensuring that the core upon discharge is in a fully extended condition.

Abstract: A device for manufacturing profiled hollow tubing comprising an extruder and two endless rows of die halves guided over guiding wheels provided with first recesses having one depth and second recesses which are shallower, such that subsequent moulds halves contact each other before coming into contact with the plastics tube as extruded.

Abstract: Apparatus for forming annular articles from elongated workpieces of thermoplastic material is provided with clamps for grasping the ends of the workpiece, and a heating plate with two opposed surfaces; the clamps apply the ends of the workpiece to the plate to heat them and then bring the ends together.

Abstract: A device for forming a tube of plastic material with a socket having an annular corrugation has a tube supporting core and a plurality of radially movable segments provided adjacently with contacting wedge surfaces, the segments in outwardly shifted position defining a circumferentially beaded portion for forming the annular corrugation on the supported tube.

Abstract: A procedure is described for drawing glass fibers which are particularly suitable for use in optical waveguides. A laser is used as a souce of heat and an optical system is provided for focusing an annular beam around a glass preform from which the glass fiber is drawn. Particular attention is devoted to the optical focusing system to provide highly uniform distribution of heat and insure very precise short and long term fiber diameter control and precise control of the optical properties (freedom from scattering centers, profile of optical properties across the diameter) of the fiber. Precise diameter control of glass fibers for optical waveguides is highly desirable because it minimizes optical losses and facilitates low-loss splicing of individual glass fibers.

Abstract: Apparatus for making flexible corrugated tubing of relatively large diameter and wall thickness from an extruded sleeve of uncured vulcanizable stock. The sleeve is placed on a cylindrical forming mandrel and radially expanded into an axially extensible and compressible forming member having interior edges that define successive convolutions coaxial with the mandrel and which form creases in the sleeve when it is radially expanded. The mandrel is supported at its opposite ends by two spaced forming head assemblies that surround the ends of the sleeve and which also engage the opposite ends of the forming member. When the sleeve is radially expanded to form bulges between the interior edges, the forming head assemblies are simultaneously moved in an axial direction toward one another by power means to compress the forming member and sleeve and thus, to produce embryonic corrugations in the sleeve.

Abstract: An apparatus adapted for continuously vulcanizing elastomeric hose comprises a tubular, helically extending vulcanizing chamber with an entrance for unvulcanized hose at one end and an exit for vulcanized hose at the other end. Means are provided to circulate fluid at elevated temperatures and pressures through the chamber thereby transporting the hose therethrough while simultaneously providing the heat and pressure required for satisfactory vulcanization. Special sealing means are provided to permit the flaccid hose structure continuous entry to the chamber while effectively preventing escape of pressurized fluid contained therein.

Abstract: The process and apparatus for use in the injection-blow molding of relatively thin walled thermoplastic articles with accurately controlled wall thicknesses. Also, the sub-process and apparatus for use in the blow molding of certain nestable thermoplastic preforms into non-nestable relatively thin walled containers.

Abstract: A hydraulic operated machine for expanding lengths of rigid thermo-plastic tubing providing a shiftable table on a base retaining liquid cooling and heating containers movable from a heating to a cooling and a discharge position including means for holding a length of rigid tubing vertically in the heating container. An expansion assembly positioned above the containers adapted to descend into the softened tube in the heating container and forming same by enlargement of the expansion assembly and raising the expanded tube for descent into the cooling container and rigidizing and discharging same following contraction of the expansion assembly.

Abstract: Apparatus for making corrugated flexible tubing such as the suction hose used in a vacuum cleaner comprises an extruder which extrudes tubular plastic material with annular corrugations, followed by a higher-speed haul-off device, a heater, a cooler, and a lower speed haul-off device, all placed to act on the corrugated tube as the latter is passing over a mandrel, so that the corrugations become compressed to a close-pitched condition by the speed differential of the haul-off devices, the condition being set by the action of the heater and cooler.

Abstract: The cooling device consists of a plurality of cooling elements which are arranged in such a manner that they surround the tubular sheeting without interspace. Cooling elements with plane inner surface alternate with cooling elements with curved inner surface, the plane surfaces and the projections of the curved surfaces each have the shape of a regular trapezoid. The cooling elements can be adjusted to the diameter of the tubular sheeting in transverse as well as in oblique direction with respect to the axis of the hollow space formed by the cooling elements.

Abstract: The disclosed embodiment of the present invention is an apparatus for bending plastic pipe so that it can be molded to a desired configuration. The disclosed apparatus includes a generally cylindrical container which is open at one end and contains a heat transfer medium, preferably in liquid form, in which the plastic pipe can be submerged. The container is mounted at an acute angle with respect to horizontal so that one end of a pipe can be inserted into the open end thereof. A heating unit maintains the heat transfer medium within the container at a regulated temperature which is within the temperature range for heating plastic pipe sufficiently to permit it to be molded. The container and heating unit are mounted on a carriage for providing portability to the apparatus.

Abstract: The means for creating perforated concrete casing comprises a hollow cylindrical canister having a plurality of spaced apart rows of elongated openings formed therein. The elongated openings in each row are horizontally disposed and are vertically spaced. A first support means is secured to the outside surface of the canister adjacent each row of openings. A plurality of vertically spaced plates are mounted on each of the first support means and are selectively movable into and out of the openings of the associated row. A second support means extends upwardly through the canister and has a plurality of vertically spaced wedges mounted thereon. The second support means is movable towards the canister so that the wedges will penetrate the stiff concrete positioned adjacent the inside surface of the canister so as to create tapered perforations therein.

Abstract: A boat stanchion is formed of a single, continuous strand of fiberglass and thermosetting resin. The fiberglass strand is wound into a loop having a multiplicity of turns and the loop is then flattened to form a substantially straight bundle of overlapping strand sections. The strand bundle is placed in a mold with thermosetting resin. One half of the mold includes a pair of pointed rods which separate the strand sections when the two mold halfs are brought together to form two holes. The partial loop of overlapping strand sections at one end of the bundle encompasses one of the holes and approximately one half of the overlapping strand sections at approximately a mid-point of the bundle are positioned on one side of the other hole and the remainder thereof are positioned on the other side of that hole.

Abstract: Limp, elastomeric hose is fed through a pressurized chamber having an inlet and an outlet opening, the outlet opening leading directly to a pressurized hose treatment zone. Seals at both the inlet and outlet opening of the chamber simultaneously permit continuous passage of hose and prevent escape of the pressurizing fluid from the chamber and from the treatment zone. The hose is driven from the inlet end of the chamber up to and out of the outlet seal of the chamber, and into the treatment zone by a pair of vertically spaced substantially mutually parallel, endless, flexible belts disposed within the chamber.

Abstract: In the apparatus for preparing heat-shrinkable plastic tubing by radially expanding lengths of plastic tubing to a larger diameter within a rigid cylinder by heating the cylinder externally and pressurizing the interior of the extruded plastic tubing with gas to cause the tubing to radially expand against the interior walls of the rigid cylinder,The improvements which comprise:A. employing in place of the rigid cylinder a heat-resistant flexible sheet looped into a cylindrical shape to form a restraint,B. employing a pair of clamps extending longitudinally along the cylindrical shaped sheet along the portions of the sheet which meet and abut to form the cylinder, positioned such that the ends of said sheet are between the clamps, andC. employing means for heating the tubing comprising a device for injecting a hot gas into the interior of the extruded plastic tubing.

Abstract: In an expansible core, a plurality of first plate segments are moved radially outwardly by means of a conical portion on an operating rod which is moved axially along the longitudinal axis of the core. A plurality of second plate segments are moved axially by the operating rod into the plane of the first plate segments and then expanded outwardly into the spaces between the first plate segments. First and second retraction means are also provided on the operating rod and are engageable respectively with the first and second plate segments to retract the plate segments from their expanded positions upon axial movement of the operating rod in the other direction.

Abstract: A tube expander apparatus having an axially displaceable central shaft, a plurality of convex expander shoes in succession circumferentially around the shaft, and pivoted linkage arms between the shaft and the expander shoes and including:A. first linkage arms pivoted to the expander shoes and to a fixed support collar which slidably passes the shaft;B. and second and third linkage arms which are pivoted to the expander shoes above and below the latters' axial midpoint and to collars fixed to the shaft.

Abstract: .Iadd.A method and apparatus for manufacturing a tube to be used for forming plastic reclosable bags including means for extruding a continuous annular tube of plastic with circumferentially spaced axially extending interlocking rib and groove profiles on the surface from a die shaped to form the tube and profiles, means for delivering tube separating air through the die into the tube interior, means for delivering a flow of outside cooling air around the outer surface of the tube to cool the tube at a rate to maintain the profiles on the surface of the tube and drawing means positioned for receicing the tube and drawing it from the die and flattening it. .Iaddend.