Abstract: A method of manufacturing a heat absorbing element, the method comprising combining a first metal strip face-to-face with a second metal strip having a width greater than that of the first to form a composite strip wherein the side margins of the second strip extend laterally outwardly beyond the side edges of the first. The composite strip thus has a central portion extending longitudinally of the strip comprising a double thickness of strip and portions extending longitudinally of the strip on opposite sides of the central portion each comprising one less thickness of strip than the central portion. The central portion of the composite strip is then formed into a tube, and the tube is closed along a line extending longitudinally of the tube with the side portions of the composite strip extending outwardly away from the seam to form a pair of fins along the tube.

Abstract: Powder metal first pressed into a green briquette having an inner cavity is then sintered to form a rigid part. The inner cavity of the part is next sized in a lap-like operation by a spherical-shaped tool. The tool is rotated in an orbital pattern comprising a series of elliptically-shaped cycles. As the tool rotates, small successive portions of a surface of the cavity are contacted by the tool. This lap-like interaction between the tool and cavity surface not only sizes the cavity to an exact dimension but improves the wear quality of the cavity surface by increasing the density of a wall of the cavity as well as providing an improved surface finish.

Abstract: This specification teaches a method of assembling stackable components which is initiated by stacking a first stack forming member. This member has at least a pair of strap securing areas associated therewith on opposite sides thereof. A plurality of stack forming structures is stacked upon the first stack forming member and thereafter a last stack forming member is stacked upon the plurality of stack forming structures. The last stack forming member also has a pair of strap securing areas on opposite sides thereof. A pressure is applied to form the first and the last stack forming members and the stack forming structures stacked therebetween into an assembly. While the pressure is being applied, assembly holding straps are secured, as by stapling, on opposite sides of the assembly between the strap securing areas of the first and the last stack forming members.

Abstract: Apparatus and a method for inserting tube supports into a loose coil bundle are disclosed. A tube support insertion machine is disclosed wherein a series of spaced support arms are located within a cylindrical coil bundle. A drive is provided for forcing the support arms outwardly, each support arm having a tube support mounted thereto such that the tube supports are forced through the coil bundle securing each of the loops of the bundle in the appropriate location. A tube support for securing the coil bundle prior to the tube sheet insertion and a drive for co-ordinately driving the various support arms with equal force are further disclosed.

Abstract: A process for preparation of support tooling for extruding dies is described in which a substantial reduction in machining is experienced by utilizing a pattern destroying precision casting system in which the pattern is adjusted to shrinkage and provided with a die orifice opening staged up in size to suit the particular support role of the tooling as in a backer or bolster. This is significant because such support elements are regarded as one-of-a-kind structures. Finish machining and treatment requires minimal time and at substantial energy reduction. The pattern is prepared from a destructible or vaporizable plastic material replaced by the molten metal conforming to the mold configuration.

Abstract: A ball bearing adapted for axial movement on a shaft is comprised of a cage having guideways defining endless paths having axially extending portions for loaded and unloaded balls, and semicircular end portions. An outer sleeve surrounds the central portion of the bearing and defines races for balls in the endless paths. End rings on the axial ends of the bearing radially outwardly cover the semicircular quideway portions. The semicircular guideway portions have outwardly convex bottoms, and the end rings have concave recesses in their inner surfaces aligned with the semicircular guideways. The convex portions of the guideways and the concave portions of the recesses have common centers of curvature extending parallel to the bearing axis and displaced outwardly therefrom.

Abstract: The method of U.S. Pat. No. 3,866,315 is improved by brushing copper particles also on the other side of the niobium ribbon prior to, e.g., rolling and by increasing the layer's thickness by an electrolytic process. That layer will be on the outside of the tube. Tin is subsequently deposited thereon; and by means of annealing, the tin is caused to diffuse through this outside copper layer and into the niobium to form a uniform Nb.sub.3 Sn layer.

Abstract: A method and material for the manufacture of improved bearing elements such as annular inner and outer bearing ring blanks for ball, roller and needle bearing assemblies comprising the steps of mixing a powder consisting substantially of iron with ferro-alloy powders of substantially smaller size, each ferro-alloy containing at least 80% iron and the balance being an alloying element, together with graphite powder and a lubricant, compacting the resulting mixture to form a preform, pre-sintering the preform, and then coating the sintered preform with a stop-off and lubricant. The preform is subjected to a plastic deformation of at least 50% in a cold (room temperature) forging operation to produce an article which is at least 98% dense and has approximately the shape of the finished article. This cold forged shape is resintered and annealed, after which the annealed and resintered shape is roll formed into substantially final dimensions.

Abstract: A shell and tube type heat exchanger having a tube bundle supported at opposite ends in tube sheets is capable of being repaired quickly by closing off opposite ends of a damaged tube using the method and apparatus disclosed. The apparatus comprises a two-part tapered plug assembly which is adapted to be installed in the tube in alignment with the tube sheet and expanded radially outward into tight engagement with the interior of a tube by pulling an inner wedge portion of the plug assembly axially relative to an outer ring portion. The pulling is effected by an hydraulic ram which is connected by a breakaway unit to a pull rod which slides axially relative to a compression tube both of which are received axially within the defective tube. The hydraulic ram pulls the rod relative to the compression tube and thereby draws the wedge inside the ring until the breakaway connection releases the pull rod and enables the pull rod, compression tube and auxiliary parts to be withdrawn from the defective tube.

Abstract: A method particularly suited for manufacturing a pulverizer, i.e., grinding, roll (18) of the type that is designed to be embodied in a bowl mill (10) so as to be operative therein for purposes of effecting the pulverization of a material such as coal through the coaction of the pulverizer roll (18) with another surface with which the bowl mill (10) is provided for this purpose.

Abstract: The ends of bundles of microporous tubing may be potted in otherwise conventional manner for assembly as a diffusion device for oxygenation of blood, blood plasmapheresis, or the like. In accordance with this invention, prior to impregnating the bundle ends in sealant, the micropores of the capillary tubing are filled with a liquid capable of entering the micropores, with the result that air in the bores of the tubing cannot migrate outwardly through the micropores as the sealant impregnates the bundle ends. This, in turn, prevents the sealant from advancing into the bores of the tubing to the level occupied by the sealant outside of the bores of the tubing, so that the ends of the potted bundle may be transversely cut within the block of cured sealant to expose open bores of the tubing.

Abstract: A method for manufacturing elongated dense bodies of metals or metal alloys by extrusion of a powder charge enclosed in a metal capsule. A closed, powder-filled capsule is heated to a temperature necessary for bonding the charge under pressure, and the capsule is then inserted in a pressure chamber and surrounded by a layer of a solid, readily deformable material, such as talcum powder or pyrophyllite. A piston is inserted into the pressure chamber and subjects the capsule and the surrounding material to a pressure such that the capsule and the surrounding material are pressed out together through an opening in a die. Tubes can also be extruded, with the deformable packing material filling the tube bore.

Abstract: A method of making a multi-layer tube includes the steps of pre-heating two elongate metal strips and bending each to a substantially arcuate curvature. Each strip is then wound helically with abutting edges, one strip being closely concentrically wound around and axially offset with respect to the other, so that the strips define a cylindrical tube. A synthetic resin is applied between the strips and to the interior of the tube during the winding step and is then pre-cured. Thereafter, a coating of the synthetic resin is applied to the exterior of the tube and then all of the synthetic resin is fully cured.

Abstract: A piano action mechanism wherein a shaft pin for rotatably supporting a rotatable member on a flange is carried in bearings formed of bushing cloth glued to the surface of bushing holes in the rotatable member. With a pin inserted through the cylinders of bushing cloth, the assembly is dipped in water, dried, dipped in a solution of resin bonded fluorocarbon solids, again dried and the pin removed, to provide a durable and stable bearing having a low coefficient of friction and which is essentially noise-free and insensitive to changes in temperature and humidity.

Abstract: Residual favorable stresses are induced in a zone of stress concentration in a coupling and connection joint mechanism of a drill collar or drilling tool, for example. The residual favorable stress is created by tensily stressing the material within elastic limits, relieving the stress in the zone by heating the material therein into a nonstressed plastic or liquid state, and releasing the tensile stress maintained in an area adjacent the zone. The residual force of elasticity in the area adjacent the zone applies the favorable residual stress in the zone. Preferably, the favorable residual stress is a compressive stress to resist fatigue failures from tension-induced cracks. The extent and depth of penetration of the favorable residual stress in the zone is controlled and is substantially greater than that available from mechanical cold-working surface-hardening techniques.

Abstract: This invention relates to a tube insertion machine, and more particularly to a machine which efficiently inserts heat exchange tubes into holes in opposed end plates and middle plates of shell and tube type heat exchangers.

Abstract: A method of manufacturing a resilient side bearing of the type utilized between a truck and body of a railway vehicle includes the steps of providing a bearing housing; sealing the bearing housing to form an enclosed bearing chamber, pouring liquid resilient bearing material into the bearing chamber; permitting the liquid resilient bearing material to cure and become bonded to the interior surface of the housing to form the bearing; and removing the seals after the bearing material has cured.

Abstract: An apparatus for assembling cooling tubes and fin elements in the manufacture of heat exchangers, particularly radiators for motor vehicles, comprises stations for feeding the tubes and the fin elements to grooves in a rotatable drum. A tube and a fin element are positioned together in each groove in the drum and are then ejected together at an ejecting station by an expelling device. An advancing means advances the tube and the fin element along a transportation path in an alternate relationship. The tubes and the fin element are soldered to form units during their passage through a soldering station. In a preferred embodiment the feeding station for the fin elements is provided with a separate groove into which the fin elements are fed, before the transfer to the grooved drum.

Abstract: An apparatus for assembling cooling tubes and fin elements in the manufacture of heat exchangers, particularly radiators for motor vehicles, comprises stations for feeding the tubes and the fin elements to grooves in a rotatable drum. A tube and a fin element are positioned together in each groove, and are then ejected together at an ejecting station by an expelling device. An advancing means advances the tube and the fin element along a transportation path. The tubes and the fin elements are soldered to form units during their passage along the transportation path through a soldering station. The expelling device initially operates at a fast speed to eject the tubes and fins and then operates at a second slower speed to advance, in cooperation with the advancing means, the tubes and fins along the transportation path.

Abstract: A cooled mirror for high power optical systems is fabricated by chemical vapor deposition of material on coolant tube forms.