Abstract: A method and apparatus for sealing a hole in the inner wall of a double wall heat exchanger in which cover means is positioned in biased relationship to the hole and a frame positioned in the opening through which the cover means is inserted against the hole.

Abstract: A method for selectively obturating at least one end of a structural module provided with rows of parallel ducts for the passage of at least two different fluids, said method comprising the steps of forming notches in those portions of the module end corresponding to the rows through which flows a first one of said fluids, said notches forming openings through the lateral wall of said module, and depositing an impervious material over the end of said module, so as to obturate the ducts through which the other fluid or fluids flow, while laterally leaving free access, by means of said notches, to the ducts through which flows said first fluid, said impervious material being sprayed in a liquid state, then gradually cooled, the angle at which it is sprayed being between 18.degree. and 30.degree. with respect to the direction of the ducts.

Abstract: A method of making a new high performance heat transfer tube for use in an evaporator of a refrigeration system is disclosed. According to this novel method, a grooved mandrel is placed inside an unformed tube and a tool arbor having a tool gang thereon is rolled over the external surface of the tube. The unformed tube is pressed against the mandrel to form at least one internal rib on the interior of the tube. Simultaneously, at least one external fin convolution is formed on the exterior of the tube. The external fin convolution has depressed sections above the internal rib where the tube is forced into the grooves of the mandrel to form the rib. A smooth roller-like disc on the tool arbor is rolled over the external surface of the tube after the initial formation of the external fin and internal rib. The resulting heat transfer tube has an exterior with a subsurface channel consisting of interconnected cavities and subsurface passages.

Abstract: A compact multiple coil heat exchanger having a high heat transfer density is provided to include at least an inner coil formed from a continuous tube into a plurality of contiguous turns about a common axis in a spiral arrangement and having a pitch in one direction and an outer coil formed from the continuous tube into a plurality of overlapping turns concentrically about the inner coil in a spiral arrangement having an opposite pitch. Further, a coil-forming apparatus and continuous coil-forming method is directed to form a multiple coil heat exchanger from a continuous tube using a coil-forming die rotatably mounted on a support frame. The coil-forming die includes a continuous spiral thread constructed to receive and laterally support the continuous tube while fabricating the multiple coil heat exchanger according to the continuous coil-forming method of this invention.

Abstract: A positive drive system including a coined drive cable (26) having a plurality of regularly spaced nodules (29) rigidly attached along at least a portion of its length, and one or more positive drive sheaves (20, 22, 23, 24) configured to receive the cable and its nodules to provide a positive, nonslip drive engagement between the drive cable and the sheaves.

Abstract: A method of making a composite gasket. A composite gasket is formed from an annular coiled strip of heat-resistant core material having a metallic tanged core and a facing layer, as of a mica-based material, integrated with the strip. The coil is placed in a first die and axially compressed under a relatively low pressure into a preform having a plurality of crevices in its face. The preform and a temperature-resistant sealing material, such as expanded graphite, are placed in a second die and the graphite and preform are axially compressed under high pressure to integrate the sealing material with the preform and to mechanically interlock the sealing material with crevices in the surface of the core material. The preform and sealing material are substantially deformed during the second axial compression to provide an improved composite gasket.

Abstract: A panel of thin bendable material is provided and includes one marginal portion thereof for disposition adjacent the worn side of a journal bore in a clock frame plate with the panel disposed parallelly in juxtaposition with one side of the plate. The aforementioned marginal portion of the panel includes a narrow elongated lengthwise outwardly projecting tongue disposed generally normal to the panel for reception in the worn side of the bore. The tongue is concavo-convex in cross section with the convex side opposing and seated against the worn side of the bore and the concave side of the tongue opposing the side of the bore remote from the worn side thereof. The tongue, therefore, defines an insert for renewing the worn side of the bore and against which the corresponding clock component shaft portion may be journaled.

Abstract: A device for assembling a bearing comprising an outer race ring, at least a pair of separate inner race rings, a plurality of rolling elements in the annular space between the race rings and an opening extending radially in the outer race ring aligned with the parting line of the inner rings comprising a rotatable spindle provided with guiding or centering means, a shoulder, and a hollow member capable of being slipped over the free end of the spindle and having a skirt embracing the spindle with clearance so that the inner race pieces of the bearing to be produced are clamped between the shoulder of the spindle and the head of the hollow member, means acting on the free end of the spindle being provided to press the hollow member against the inner race pieces, while means for holding the outer race stationary and means for generating a high energy welding beam are provided.

Abstract: Disclosed herein is a method for forming a heat exchanger tube comprising the steps of inserting an inner tube within an outer tube, interposing therebetween a heat conductive fin element and expanding the inner tube thereby causing frictional engagement of the inner tube, outer tube and interposed fin.

Abstract: A cage for a frusto-conical roller bearing is formed of a punched flat material strip so that an elongated bar extends along one side of the punched strip with a number of bars extending transversely outwardly from the elongated bar with the ends of these bars being free. As a result of the punching step a number of windows are formed closed on three sides but open on the fourth side opposite the elongated bar. The transversely extending bars are bent out of the plane of the elongated bar. When the punched strip is free into a ring the free ends of the transversely extending bars are located on a circle having a different diameter than the diameter into which the elongated bar is rolled. Another bar is rolled into a ring and is connected to the free ends of the transversely extending bars.

Abstract: A method of fabricating a composite structure comprising wire mesh and concrete. The longitudinal wires of a section of such wire mesh are formed together into a repeating sinuous pattern perpendicular to the transverse wires, so that the alternate transverse wires together comprise two groups each in one of two parallel spaced apart planes. A flat section of similar mesh is placed against each of these groups. Each of the flat sections of mesh and the juxtaposed group of transverse wires of the formed mesh are in turn placed together to be cured, into first and second layers of wet concrete mixes in suitable forms to produce the composite concrete-steel network structure. The relatively light weight structure may be utilized for floor, ceiling or roof slabs, and for column load bearing wall panels.

Abstract: A method of securing a bearing either bushing, roller or ball bearing and a spacer or fitting into a soft non-ferrous material such as aluminum and materials of that hardness. A bearing of this invention containing an annular groove and adjacent forming shoulder or spacer, at least 1/2 a millimeter greater in diameter than the body of the bushing is inserted into a predrilled hole. A metal ring is formed in the annular groove as the shoulder is pressed into the parent material. This metal ring being a part of the parent material and being packed into the annular groove prevents retraction of the bearing or spacer during operation by its diameter being greater than the annular groove in the bearing. The material in the annular groove is of a lesser diameter than the body of the bearing and fitting and interfers with axial movement. The shoulder of the bearing or fitting has longitudinal grooves around its circumference.

Abstract: The method of casting a plate type recuperative heat exchange envelope that encloses a hollow space therein in a single casting operation. A sand core with a heat sensitive binder therein defines the hollow space within the envelope. The sand core is supported by end extensions and lateral protuberances which rest on the sides of a sand mold to provide a space therebetween that is subsequently filled with molten metal to comprise an envelope casting. Lateral openings through the envelope casting produced by the lateral protuberances and end openings produced by the end extensions provide passageways for venting gases produced within the sand core during the casting operation, and after completion of the casting operation the same openings in the envelope assist in the removal of the sand core therefrom. The lateral openings are subsequently plugged while the end openings are maintained open to direct the flow of fluid therethrough.

Abstract: A kit of parts for converting a bed into a four-poster comprises pelmets for securing to the ceiling of the bedroom above and parallel with the sides and end of the bed, corner posts for locating one at each corner of the bed, and four brackets each including a first portion for securing to the pelmets above an associated corner of the bed and a second portion pivotal on the first portion and adapted to receive the upper end of an associated post, resilient means reacting between the second portion of the bracket and said upper end of the post, the post and second portion of the bracket being pivotal together between an operative vertical position with the resilient means urging the lower end of the post against the floor and a non-vertical position permitting insertion or removal of the upper end of the post from the bracket.

Abstract: The present invention is a method for the manufacture of bearing rings ruptured along an arrow-shaped partition line for antifriction bearings or similar devices. According to the invention a radial bore is introduced through the middle of the ring transversely of the bearing axis, and in the opposite end faces are introduced V-shaped notches which are displaced in relation to the radial bore in a circumferential direction. The bearing ring is supported on one end and ruptured first on that end by a force directed against the opposite end. The ring is turned over and again ruptured similarly until an arrow-shaped partition line extends from the radial bore to the notches.

Abstract: Fixturing for repair of automobile radiators is disclosed, usable for recoring of either brass or plastic tank radiators, including clamping gates providing parallel rails adjustably spaced to receive the radiator header with an air cylinder exerting clamping pressure on the tank top. The radiator sits atop the rails of a first set of clamping gates when resoldering conventional tanks and is recessed between the rails of a second set of clamping gates which are alternatively installed for decrimping and crimping of the header tabs of plastic tank radiators. Decrimping and crimping hand tools of special configuration are also disclosed, cooperating with the rails during use.

Abstract: Steel products having high strength or good drawing or magnetic or electrical properties, requiring levels of carbon or manganese, or both, that are too high to allow rimming action are produced to have the desired properties, in effect, but with a surface condition characteristic of rimmed steel. The method involves pouring an ingot mold 80 to 95% full of molten, rimming steel, then allowing the steel to stand and rim for several minutes while a shell freezes against the mold wall, and thereafter filling the mold while inserting into the molten steel stream additional carbon or manganese, plus any other elements such as P, Al, Cb, V, Cr, Ni, Si or others, so that the core of the ultimately solidified ingot is steel having the above-desired strength or other properties.

Abstract: A method for making a castor assembly having an upper fixing plate and a swivelling fork connected to a wheel comprising the steps of splitting the edge of a central aperture in a plate member forming the fixing plate, forming the cage to define a race for rolling elements, forming the remainder of said plate member, to a cup shape including an edge flange disposed in a plane surface spaced axially from said race and covering the fixing plate with a cover having extensions cooperating with said edge flange.

Abstract: A warning reflector construction is provided comprising a transparent plate having a rear surface opposite a light-entrance surface. The rear surface comprises torus surfaces arranged side-by-side and supporting an outermost reflective layer. The optical axes of the torus surfaces can be arranged at an angle to the perpendicular to the light-entrance surface. The warning reflector can be produced by injection moulding or stamping.

Abstract: A process for forming a double wall heat exchanger. A first ductile tube is placed inside of a second ductile tube. The first tube tightly fitting inside of the second tube. The first tube is the inner tube and the second tube is the outer tube. The combination of the outer tube and the inner tube is finned in a finning apparatus. A helical fin is pressure formed on the outer surface of the outer tube and simultaneously a small helical groove is formed on the inside surface of the outer tube which follows the path of the helical path of the helical fin. The internal pressure being applied to the inner tube causes the inner tube to expand and conform to the inside surface and diameter of the outer tube, with a continuous helical protrusion forming which mates with the internal helical groove of the outer tube, but not entirely filling the internal groove. A helical passageway between the inner and outer tubes is thereby formed. Preferably the inner and outer tubes are made of copper.