Abstract: A press roller is provided which permits adjustable bowing under load. The press roller has a hollow, rotatable roller casing through which a stationary cross head extends. A semi-circular pressure chamber is formed between the cross head and the roller casing. In this chamber, two annular pistons are provided which rest on one end surface of the inner surface of the roller casing and are guided in a sealing manner in recesses in the cross head. To prevent bending oscillations by the cross head, the annular pistons enclose substantially rigid fluid cushions which are isolated from one another.

Abstract: A method and apparatus for measuring the thickness of the wall of a tubular object includes a measurement of the intensity of a radiation beam passing through the walls and quantizing the indicated value of radiation detected by a detector with reference to a predetermined period of time. Data is expressed diagrammatically, and inflection points on the graph line indicating when the radiation beam contacts the outer and inner peripheral walls of the tube are determined and processed to thereby determine the wall thickness. There is also disclosed a method for aligning collimator members utilized in the radiation beam scanning equipment.

Abstract: A method for producing a boiling heat transfer pipe having in the circumferential wall thereof one or a number of helical or annular cavities under a ceiling wall containing a row of openings regularly spaced at predetermined intervals along the length of the cavities, such method partly including in an arbitrary order the steps of: (a) pressing a set of groove-rolling discs of gradually increased diameters against the outer surface of a blank pipe to form a fin around the circumference of the pipe; (b) pressing a notching gear against the outer side of the fin to cut notches in upper fin portions at predetermined intervals along the length of the fin; (c) pressing a set of splitting roller discs with splitting edges of gradually increased angles substantially along a center line on the outer side of the fin to split and spread apart the upper fin portions in the axial direction of the pipe; and (d) pressing a press roller centrally against the split upper fin portions to form flat side wings on lateral sides

Abstract: The invention relates to a method for joining tubular parts of a heat exchanger that are inserted into each other, as well as to a tool for practicing the method.

Abstract: A portable electric stapler wherein a bladelike impeller is reciprocable by the armature of an electromagnet which is energizable a selected number of times so that a staple which is introduced into a housing channel in front of the impeller is gradually driven into a workpiece. The magazine for staples and that part of the housing which defines the channel are movable relative to the impeller between a first position in which a pusher can expel a staple from the magazine into the channel and a second position whereby the impeller separates the foremost staple from the stack of coherent staples in the magazine. The impeller blocks the outlet of the magazine during the intervals between successive energizations of the electromagnet to thus prevent entry of a fresh staple into the channel before the driving of the preceding staple into the workpiece is completed. The rearward movements of the armature and the impeller are braked by a pneumatic brake or by a shock absorber.

Abstract: Both an apparatus and a process for pulling tubes from a tubesheet with two relatively movable gripping means are disclosed herein. The apparatus of the invention is a tube puller which has upper and lower gripping means for gripping the section of the tube surrounded by the tubesheet. The two gripping means are mechanically linked together by means of an extendable connecting assembly. This assembly includes an outer sleeve where the lower gripping means is located, and a middle sleeve where the upper gripping means is located which is slidable a predetermined distance within the outer sleeve. In the process of the invention, a tube puller as heretofore described is inserted into the mouth of a tube. The lower gripping means is then engaged to the mouth of the tube. The upper gripping means is then engaged in a section of the tube beyond the tube mouth with the extendable connecting assembly in a contracted position.

Abstract: A urethane covered metal press roll is provided by spray coating the roll body with a quick jelling resin formulation creating isolated small pores giving the cover a stone-like texture. The coating is applied to a desired depth by successive passes of a spray jet over the rotating roll body. The resin quickly jells and after being cured, the cover is ground to a desired diameter and finish.

Abstract: This specification teaches a method of attaching a fluid conducting metal tube (12) a heat dissipating metal fin (14) that includes the following steps. A metal tube (12) is formed having a generally elliptical cross-section having first similarly curved surfaces (22--22) at opposite ends of a major axis thereof and second similarly curved surfaces (24--24) at opposite ends of a minor axis thereof. A heat dissipating metal fin (14) is formed. An elliptically shaped collar (20) is formed on the fin, this collar providing an opening through the fin and being at least about 11/2 times the thickness of the metal forming the fin. The tube is fitted inside the opening of the fin so that areas of these two elements are juxtaposed. The tube is expanded along the major axis so as to bring the first similarly curved surfaces at opposite ends thereof into contact with portions of the collar in juxtaposition therewith.

Abstract: The method of making a non-metallic bearing assembly by initially molding a flat longitudinally extending sheet of rubber containing a ply or plies of fiberglass reinforced fabric therein, then cutting such sheet into a plurality of strips. The flat strips are then located around the periphery of a mandrel that is then wound with fabric which is impregnated with epoxy resin, then cured and machined to a cylindrical bearing.

Abstract: A press roll contains a stationary roll support or beam and a roll shell rotatable about the stationary roll support, the roll shell being formed of an easily deformable material. The roll shell is supported at a support surface located at the region of the roll support. This support surface can be convex and possess a larger radius than the radius of the roll shell, can be planar or concave. Guide surfaces possessing a convex profile laterally merge at the support surface. The support surface and the guide surfaces are provided with a pressure lubrication and possibly with hydrostatic bearing pockets. A support part or element can be movable in relation to the stationary roll support or beam in the manner of controlled deflection rolls.

Abstract: Split bearing assemblies are disclosed having separable bearing caps for both single applications, such as connecting rods, and multiple applications, such as engine crankshaft supports, together with methods and apparatus for making such assemblies by integrally forming the caps with the main body and separating them by fracture separation. A two step separation method is disclosed with bore starter notches and semicircular die expanders that minimize split plane and bore distortion.

Abstract: A wedge-shaped member is provided for facilitating the removal of a dual wheel from a primary wheel of a tractor. The member includes opposite sides which converge towards one end of the member to define a point. A handle is provided for positioning and carrying the member. To remove the dual wheel from the primary wheel, the nuts are removed from the tie-down bolts, and the wedge-shaped member is positioned such that the point thereof is adjacent and between the perimeter of the tires mounted upon the wheels. The tractor is then driven towards the member such that the increased width of the member is forced between the tires to separate the dual wheel from the primary wheel.

Abstract: In a method of repairing a defective tube in a tube-in-shell heat exchanger by inserting a tubular repair sleeve within the defective tube and sealingly bonding one end region of the sleeve to the tube and the other end region of the sleeve to the tube sheet in a manner such that the defect (for example a defective tube/tube sheet weld) is bridged, the improvement of providing a support against which the said one end of the sleeve can be explosively welded to the tube. The support comprises a mass of low melting point alloy cast around the tubes so as to provide support at the welding level for the defective tube as well as surrounding tubes. The support is removed after welding by remelting the alloy and causing the liquid alloy to run away. Inserts of high melting point metal can be included in the mass as reinforcement, and the casting can be effected in a removable box of which the tube sheet forms the base, the walls surrounding at least a part of the tube array which includes the defective tube.

Abstract: The manufacture of a cylinder, particularly for use in sugar mills, which has an exterior surface defining circular grooves of a cross section having the shape of a triangle, each triangle having an apex at a bottom of the groove in a respective transverse plane extending substantially perpendicularly to the axis of the cylinder, and the bottom of each groove being in communication with longitudinal channels extending substantially parallel to the axis in the cylinder, is simplified by inserting plugs into radial channels in the cylinder in a plurality of the transverse planes before making the circular grooves which are cut into the plugs into the inner ends of which are formed circular slots of sufficient length to connect the grooves to the longitudinal channels.

Abstract: A fixture useful for orienting a stack of clutch plates of a multiple disc clutch or brake assembly is disclosed. The fixture includes three major components. A base receives a stack of clutch plates. A mandrel interfits with the base and slidably mounts a fixture plate assembly. The fixture plate assembly includes a number of posts which cause the protruding teeth of the reaction plates to become aligned axially when the fixture plate is driven toward the base. Plate retention posts carried by the fixture plate assembly engage the reaction plates so that they can be removed from the base and installed within the associated structure while maintaining alignment.

Abstract: Dicumyl peroxide-dimaleimide cured EPDM elastomers can be molded to molded nylon articles so that the EPDM strongly adheres to the nylon. This practice is particularly useful in molding EPDM gaskets to nylon heat exchanger tanks.

Abstract: A tool for aligning pipes to be secured in an end-to-end relationship which includes a strap to be secured around the end of one pipe and a lever engaging the strap, the lever having a foot to engage and deform a portion of the other pipe.

Abstract: A heat exchanger for transferring heat from stale air evacuated from a building to incoming fresh air employs a core made of a stack of spaced aluminum sheets that are joined along opposite edges in an alternate arrangement to define two separate sets of air passages for the respective outgoing and incoming flows, while providing good thermal contact between the two flows. This contact is improved by generating a measure of turbulence in the air flows by forming the sheets with surface nodules. The core is mounted in a frame that can be readily slid into a housing containing fans for generating the air flows. In an alternative construction, each air flow can be caused to travel in series through two parts of each set of air passages, rather than in parallel. This series arrangement has the advantage of reducing the temperature drop across any one part of the core below the total temperature difference between the inside and outside of the building. A machine is also disclosed for manufacturing such a core.

Abstract: Miniature high frequency SC-cut quartz crystal resonators are made from a plano-plano SC-cut quartz crystal wafer by chemically polishing the wafer; then chemomechanically polishing the chemically polished wafer; then chemically polishing the chemomechanically polished wafer; depositing a suitable pattern of etch resist on the wafer using standard photolithographic techniques; chemically polishing the wafer; stripping the photoresist from the wafer; placing a suitable evaporative mask pattern into intimate contact with the wafer; depositing a suitable pattern of electrodes on the wafer; testing the resonators so formed on the wafer; selectively separating those resonators having the desired properties; mounting the selected resonators into an enclosure; adjusting the frequency of the selected resonators to the exact frequency desired; and hermetically sealing the enclosure.

Abstract: A resilient plastic ring having a sector removed. The ring is adapted to be snapped transversely onto a gun barrel adjacent a bore evacuator. When in place, the ring can be struck with a hammer to cause the evacuator to slide axially off the gun barrel.