Abstract: An improvement in the process of producing a double-walled synthetic plastic tube having a concentric outer tube and an inner tube wherein an outer tube of molten synthetic plastic is extruded from an annular die and passing to a mold cavity formed by a divided mold having two cooperating endless recirculating trains of mold halves which close to complete the mold cavity and an inner tube of molten synthetic plastic is extruded from a die orifice located in the interior of said mold which improvement comprises introducing a first gas into the space between said inner tube and said outer tube before said synthetic plastic has fully hardened, said gas being at a pressure above atmospheric and at a temperature at or above the softening point of said synthetic plastic and permitting said outer inner tubes to cool; an apparatus for carrying out the process comprising an extruder having a first die disposed over a first mandrel to define a first annular space through which molten synthetic plastic can flow en route

Abstract: An orthocasting system for producing a negative mold of the bottom of the foot with the negative mold being used to produce a positive form which is then used as a base on which to form a rigid foot support insert which is constructed in accordance with a prescription prepared by a foot doctor.

Abstract: A method for coupling tubes. One tube has a female coupler member at one end and the other tube has a male coupler member that is inserted into the female coupler member so that the outer surfaces join along a regular path. Then wire is wrapped around the joined couplers.

Abstract: A flexible baby soother comprising a tubular component defining a teat and a handle portion and a flange forming a shield moulded to the tubular component at the junction between the teat and handle portion.

Abstract: This invention makes it possible to use mechanically hard magnetic materials in the formation of one, or both, of the annular press rams used in closing the mold because at least one of the rams is not permitted to enter the mold a distance sufficient to short circuit the magnetic flux flowing radially between the center ram and the outer wall of the mold.

Abstract: A method and an apparatus for adjusting the gap between lips of a die for extruding a plastic sheet material. A pair of flat plates spaced from each other have a plurality of bolts for controlling the gap. The operational adjustment of each bolt is generated as an electric signal, and this electric signal is added with reference to all the bolts to distribute the gaps between the die lips. Each adjustment is changed so that the distribution of the gap between the die lips acquires a predetermined form to thereby determine the necessary amount of adjustment of each bolt.

Abstract: A method for controlling the extrudate emerging from an extruder is provided by sealing a portion of the extrusion die opening with a deckle bar into which is incorporated means for affecting the temperature at the surface of the deckle bar. The embodiments of this invention provide deckle bars into which are incorporated means for heating, cooling and heating and cooling in combination.

Abstract: This application discloses a method for making a candle with stones, or other desired articles, cast into the candle about the periphery thereof. This is accomplished by the use of a two step casting process, wherein a smaller core of the candle is first cast, and this core is then placed in a larger mold of substantially identical shape. The stones or other articles are then placed in the larger mold between the smaller core and the inner wall of said mold until the space therein is completely filled. Wax is then poured into the larger mold to cast these articles into the surface of the candle. Since the wax at this point will almost completely cover the articles, which are of a decorative nature and of which more of the surface should be exposed, the candle, after it has cooled, is repeatedly dipped in hot wax to remove some of the surface wax from the candle with each dipping, and then cooled by dipping the candle in water.

Abstract: Grilled flooring and stairways are made by moulding unsaturated polyester D.M.C. round metal reinforcing bars which, during moulding, are located in the mould on a plastics support.

Abstract: Method for the manufacturing of molded products from pre-formed clods of kneadable material in which the preformed clods are transported to a molding station, whereat molds are supplied in succession at a lower level. A stationary guide is disposed above the molds for receiving a clod and vertically guiding the same for discharge at a pre-determined velocity into a waiting mold where the clod substantially fills the mold of its own accord.

Abstract: A method for preparing reinforcer-incorporated plastic molded articles by rotational molding which includes moving a reinforcer and a binder of an amount smaller than the amount of reinforcer along the inner wall of a rotary mold to thereby form in advance a layer of reinforcer which is fixed on the inner side of the mold and having a large number of fine voids, feeding a liquid matrix into the rotary mold and impregnating the liquid matrix into the layer of reinforcer, and solidifying the matrix impregnated in the reinforcer in the rotary mold.

Abstract: A lightweight rearview mirror assembly for vehicles and a method for forming the same. The assembly includes a case formed from a thermoplastic material and a mirror element mounted therein. A thin, upstanding edge of the case is heated and curled into an arcuate, peripheral, retaining edge extending over the entire length of the mirror edge. The curled, arcuate edge defines therewithin a space extending between the entire thickness of the peripheral edges of the mirror and the case which allows the mirror and case to expand or contract in extreme temperatures without expelling or breaking the mirror element. Means are provided for preventing the mirror from vibrating within the case.

Abstract: A magnetic wedge is made by preparing a composition of a thermosetting resin system and magnetizable particles, placing the composition in a mold, vibrating the mold at least until air bubbles are no longer evolved from the composition, curing the composition, and fabricating the lower portion of the cured composition into the shape desired for the wedge. The vibration removes air and compacts the particles which results in a wedge having overall superior physical and magnetic properties.

Abstract: A method of forming a lightweight, airlaid web of wood fibers suitable for tissue and toweling applications comprises airlaying a wood fiber continuum onto a foraminous carrier, bringing the continuum into contact with a transfer member printed with an adhesive in a preselected pattern, the adhesive being disposed in a low viscosity fluid, and removing the fluid to provide an airlaid, adhesively bonded web.

Abstract: The method of making a perforated particle screen having a base layer or high density polyethylene low melting index thermoplastic material with a cover layer of elastomeric material vulcanized integrally with the base layer. The method includes providing a mold with inserts for forming the perforations, filling the mold with granular plastic, covering the plastic with uncured elastomer and applying heat and pressure to the elastomer to vulcanize same integrally with the plastic as it melts and flows in the mold.

Abstract: An ornamental plastic article having a smooth rear exterior surface and a rough, randomly arranged layer of plastic particles or pellets forming the front outer surface is produced by placing a layer of plastic powder on one surface of a first mold form containing an outer wall having the configuration of the article, heating the powder until the powder becomes tacky in the form of a strip, placing this form on top of a mating second mold form having an outer wall containing various pockets of different colored plastic pellets of a compatible plastic material located in predetermined locations within the outer wall, rotating the two forms until the tacky powder form is on the bottom and the pockets of colored plastic pellets are on top, reversing the position of the two forms, and removing the first form which has a layer of plastic pellets affixed to the tacky layer in predetermined color arrangement corresponding to the pocket location on the second mold form, heating the pellets until they become soft, and

Abstract: A method of fabricating a reinforced plastic tubular article. A mandrel is positioned within a mold in spaced relation to the inner surface of the mold. Dry reinforcing material, in the form of fibrous or particulate material or a combination of both, is located in the annular space between the mandrel and the mold. The interior of the mold is evacuated to remove gas from the mold as well as from the voids within the reinforcing material. An uncured thermosetting resin system, which was mixed under vacuum conditions to remove gas from the system, is introduced into the mold. Pressure is applied to the resin to thoroughly impregnate the reinforcing material with the resin. The resin is then cured by heating while the pressure is maintained on the resin. The resulting cured product has a smooth outer surface which facilitates the attachment of coupling members and has improved mechanical properties.

Abstract: A method or process of forming an arch or curve or other geometric figure or a memory retention of said arch, curve, or other geometric figure, in either extruded moldable polymer or moldable polymer, either filled or unfilled.

Abstract: An elastomeric encapsulated chain wherein the individual links of the chain are covered with an elastomer suitably of polyurethane and in one embodiment the individual links of the chain are separated by a plug of elastomer to permit the chain to be pulled under tension to compress the elastomer plug.

Abstract: A hollow structural member formed of thin sheet steel is formed with one or more longitudinal joints and the interior is filled with a rigid lightweight synthetic plastics foam such as polyurethane. Each joint includes folded lips or flanges which are designed to provide a restricted clearance or gap into which the foaming material penetrates and changes from a cellular to a non-cellular composition and also provides an adhesive bond at each joint and a moisture proof seal.