Abstract: A round copper or copper-alloy tube is internally coated with a relatively thick nickel or nickel-alloy layer and formed into a tube of rectangular or square-shaped cross section; the tube or cut-off sections thereof will serve as molds for continuous casting.

Abstract: A mold for continuous casting has indents, grooves, or recesses in the mold wall itself and/or along one or more edges thereof; wear-proof inserts are fitted into these grooves or indents and fastened thereto by means of electron beam welding along exposed joint lines between the inserts as inserted and border edges of the indents or recesses. The inserts are affixed in this manner along edges for engagement with other mold walls, and/or along the lower edge and/or a level which is expected to coincide with the surface level of the molten steel in the mold.

Abstract: The base material for silance grafting is to be a mixture of at least 50% of a polyolefin (compound A) and of not more than 50% of a different polymer or elastomer serving as property modifier (compound B). The compound A is silane grafted separately or together with compound B. The grafted material is extruded around a conductor or a tube followed by crosslinking in the presence of moisture.

Abstract: Two tube systems, each comprised of two or more concentrically arranged metal tubes, are positively and electrically conductive interconnected through a coupler sleeve system composed of a corresponding number of concentrically arranged coupler sleeves of slightly larger diameter such that ends of the sleeves of the coupler sleeves are threaded upon ends of the tubes of the tube systems to be interconnected.

Abstract: A tube is thermally insulated by helically wrapping a water-repelling spacer around the tube; longitudinally folding a paper ribbon carrying a separating medium around and onto the helical spacer; injecting a foaming material into the tube as it is being formed, and permitting the material to foam inside the folded ribbon; and further permitting the foam to cure and set. Subsequently, the ribbon is peeled off the foam and, preferably, a metal or metalized foil is wrapped around the exposed foam, which is followed by the extrusion of a thermoplastic, synthetic envelope onto the foam.

Abstract: An improved apparatus for extruding an expandable thermoplastic composition onto an elongated article is disclosed comprising an extruder housing; a cylindrical extruder screw axially positioned within an extruder barrel within the housing; a device for heating the expandable thermoplastic composition passing through the hollow chamber; a gas input for supplying an inert gas into the extruder barrel; and a die head attached to the output end of the extruder housing through which an elongated article is passed for the extrusion thereon of the expandable thermoplastic composition.

Abstract: A gas-tight connection is achieved by fusion bonding a flanged end portion of a thin walled, corrugated metallic tube onto a flanged interior surface of a metallic sleeve whose interior surface includes helical threads that correspond to the helical corrugations on the outer surface of the metallic tube. The method disclosed comprises screwing the sleeve onto the tube to a position and orientation whereat the flanged interior surface of the sleeve faces, but is longitudinally separated from, the end portion of the tube to which it is to be bonded. The end portion of the tube is then decorrugated and expanded; a clamping tool is coaxially positioned about such end portion of the tube, a forming mandrel is axially positioned within such end portion, and the clamping tool is tightly closed so as to flange such end portion in a manner to parallel the flanged interior surface of the sleeve.

Abstract: An improved process and apparatus for continuous production of welded tubes is disclosed wherein a metal strip material is formed into a tubular form, the longitudinal edges thereof welded, and the welded seam cold worked by the application of a high frequency pulsating force to each area of the seam, while it is supported and widened from within.

Abstract: Individual cables are provided with lateral ridges to be snapped behind noses of cutouts in rails by means of which the winding is assembled and retained. The rope-ladder-like assembly is installed by placing the cable portions, resembling the rungs, into grooves of the stator core, also having noses behind which the cable ridges are lodged.

Abstract: A spacer is coiled about a drawn, seamless copper tube, and a metal foil or metallized paper ribbon is folded around the coiled spacer. A blend for foaming is injected into the unoccupied space between the folded foil or ribbon and the inner tube, to generate a cyanurate-modified polyurethane foam network in which phosphorous or halogen molecules are embedded by chemical bond. A flame-resistant ribbon is folded about the metal tube. The resulting product and further details of the process are described.

Abstract: An improved insulated transmission line for the transfer of cryogenic media is disclosed comprising: a tubular heat shield, including at least three concentric, radially separated, corrugated metallic tubular members, that provides a first annular space between two of the tubular members wherein a multiple layer, fibrous insulating material is disposed under vacuum conditions; a second annular space between two of the tubular members, including the innermost of the tubular members, containing a liquid or gaseous cooling media; and a vacuum sealed, inner tubular space formed by the innermost tubular member; the improvement comprising: a plurality of corrugated metal pipes extending through such vacuum sealed inner tubular space and being spacially separated from each other and from the tubular heat shield for providing minimum heat conductance between the metal pipes, and between the metal pipes and the tubular heat shield, throughout their respective axial lengths.

Abstract: An insulated cable has a hermetically enclosed sheath. Between the sheath and the insulation of the cable is a filler of a thermoplastic material. When the cable is heated (e.g. a localized fire) gases and acids that are given off by the insulation are absorbed by the filler which also expands resulting in a structural blockage to the longitudinal flow of the acids and gases.

Abstract: In accordance with the teachings of the instant invention, methods and apparatus are set forth for the manufacture of discrete lengths of heat exchanger tubing comprised of a thin walled metallic tubular member having a plurality of spaced apart transverse grooves impressed into its outer surface, and expanded end portions whose inner cross sections form symmetrical polygons. Such tubing is manufactured in accordance with the instant invention by the steps of deforming a metal band in a longitudinal direction into a tubular member, continuously seam welding the longitudinal edges of the tubular member, continuously impressing spaced apart grooves into the outer surface of the welded tubular member, transversely cutting the tubular member along smooth portions of the tubular member between selected adjacent transverse grooves to form discrete tube lengths, and expanding the inner cross sections of the end portions of each of such lengths to form symmetrical polygons.

Abstract: A composite corrugated electrical cable is provided in accordance with the teachings of the instant invention wherein a plurality of corrugated tubular conductors are concentrically positioned with respect to each other, each of such tubular conductors having corrugations that differ from those of the immediately adjacent tubular conductors in wave pitch, shape, depth or longitudinal separation. The corrugation arrangements permit differential longitudinal displacement between adjacent tubular conductors for achieving a composite cable of high flexibility. Further, various corrugation protrusions engage the adjacent tubular conductors to provide radial spacial separations between the adjacent tubular conductors thus providing an intermediate path through which a cooling medium may be passed for increasing the heat dissipation and the power capacity of the electrical cable.

Abstract: A heat exchange apparatus is disclosed comprising a heat transfer conduit wherein a heat transfer fluid flows in a corrugated sealed evacuated tube between hot and cold zones with the fluid being evaporated in the hot zone and condensed in the cold zone, said tube being wound to provide a plurality of windings, with a first portion of each winding being in the hot zone and a second portion of each winding being in the cold zone. The heat transfer conduit so wound is axially positioned within a tubular container comprised of a metal of high heat transfer conductivity and having a polygonal cross section. Each first portion of such windings is attached to an interior surface of the tubular container by means of a connector member also of a metal of high heat transfer conductivity, thus providing an efficient heat conductance path from the outside surface of the tubular container to the inside surface of the plurality of windings in the hot zone.

Abstract: A method of fabricating a plurality of heat transfer conduits is disclosed wherein an elongated metal pipe is evacuated, a predetermined quantity of heat transfer fluid is placed within such evacuated pipe and the pipe ends sealed airtight. The elongated sealed pipe is wound in a helical or serpentine configuration, the lower vertical portions of the so configured pipe are heated so that the liquid phase of the heat transfer fluid is evaporated and redistributed in an even manner in the lower vertical portions of successive convolutions of such pipe, and is then flattened, for example, at each of its upper vertical portions to form vacuum-tight seals between adjacent convolutions. A cutting procedure across each of the flattened upper portions (or selected ones of such flattened upper portions) enables a separation of the elongated sealed pipe into a plurality of heat transfer conduits without the necessity of a further evacuation procedure.

Abstract: A communications cable in which optical waveguides partially fill the inner cross section of a corrugated metallic tubular member and form therein an undulatory configuration extending in the axial direction; thus providing for any given section of cable a length associated with the optical wavesguides that is greater than the length of the corresponding section of the tubular member of such section of communications cable.

Abstract: A corrugating ring for corrugating metal tubing having a helical corrugating rib which increases in height from the beginning thereof to a maximum height to increase corrugation depth, with the maximum height extending over at least 360.degree.. The corrugating rib has a curved corrugating surface, and the radius of curvature of the surface increases from the beginning of the rib to the maximum height thereof whereby corrugation width is increased with corrugation depth.

Abstract: A winding device comprised of parallel spaced supporting bodies on which an elongated flexible material is helically wound in a single layer. The bodies are interconnected by a folding mechanism, whereby the bodies can be axially displaced to reduce the distance therebetween and thereby reduce the length of one axis of the wound material while retaining the length of the other axis to permit transportation thereof in appropriately sized containers.

Abstract: A device for unwinding elongated material from a coil which includes a plate which is placed on top of the coil, with the plate including a rotatable guide means for guiding unwound material, and at least two elongated arcuate members which extend into the coil interior and define a cylindrically shaped shell. The arcuate members are pivotally mounted to the plate, and are provided with a means which exerts a force against the arcuate members to press the arcuate members against the coil interior to hold the interior windings as the coil is unwound.