Abstract: In a master cylinder assembly separate master cylinders are connected by a common transfer passage through which the pressure spaces of the master cylinders in advance of pistons are in communication when the master cylinders are operated simultaneously, and communication between the pressure spaces is cut off by a transfer valve mechanism when one of the master cylinders is operated on its own. Each piston is guided to slide in its respective bore only by the sliding engagement with the bore of a guide portion of the piston and the guide portion is disposed on the outermost side of a transfer port with which the transfer passage is in communication when the piston is in a retracted position.

Abstract: A gasket retention for heat exchanger plates includes a projection on the gasket which passes through an aperture in the plate with an interference fit. According to the present invention the apertures (2) are made so as to provide two alternative positions for the gasket projections (3), namely a tight position as illustrated in FIG. 1c and a freely movable position. The movement between positions may be by twisting as in FIG. 1c, or by a longtitudinal movement, e.g. in a key-hole slot aperture. The aperture may be tapered through the plates.

Abstract: The piston of an hydraulic master cylinder is guided to slide in portions of a bore in a body on opposite sides of a port in the wall of the body by a guide portion of the piston which is disposed on the outermost side of the port and by a cylindrical, axially extending, guide part at the outer end of a radial flange on a retainer. The retainer is mounted on an extension at the inner end of the piston and forms an abutment for a return spring for the piston.

Abstract: Device for producing steam by heat exchange between a heat-transfer liquid metal and feed water, comprising a cylindrical casing (31) receiving liquid metal in its upper part through at least one nozzle (35, 36). The liquid metal enters in a space bounded by a central sleeve (38), a lower perforated distribution plate (40) and a first perforated plate (45). A second perforated plate (46) parallel to the latter is separated therefrom by perforated crosspieces (47). The perforated plates (45 and 46) are disposed between the sleeve (38) and a peripheral sleeve (39). The three plates (40, 45 and 46) have identical perforations which are aligned in the vertical direction. The distribution plate (40) is provided with stiffening ribs (44) ensuring the distribution of the liquid metal thereon. The invention applies, in particular, to fast breeder nuclear reactor steam generators cooled by liquid sodium.

Abstract: In an arrangement of at least two discrete structural parts in package form which are spaced apart from each other, the individual structural parts are coated at least on one circumference of the structural part with a metal- or ceramic-powder collar. The powder collars serve as spacers between adjacent structural parts, are preferably sprayed on, and reliably prevent fretting corrosion between the structural parts.

Abstract: A solar heating and cooling system is disclosed which provides substantially consistent levels of temperature within a preselected range in an air space of an enclosed structure. The system includes a first store which functions as a heat source and a second store which functions as a heat sink. A variable feed fan is used for transmitting air through the first store and into the air space when the level of the sensed temperature within the air space drops below the preselected range. A second variable speed fan is used for transmitting air through the second store and into the air space when the level of the sensed temperature within the air space rises above the preselected range. Both fans are used to transfer heat from the warm store to the cool store when the warm store overheats. Energy may be purchased on an as needed basis or at off peak periods in anticipation of need.

Abstract: An improved louver pattern for fins of a tube and fin type heat exchanger, in which groups of louvers are formed radially with respect to the tubes, extending from each tube to adjacent tubes. Each louver group consists of a plurality of parallel slits in the fin extending in the radial direction, and defining elongate rectangular portions of the fin therebetween, which are twisted at an angle to form inclined louvers in an otherwise generally planar fin. The louver groups thus formed provide improved turbulence and mixing to break up the viscous or boundary layer of flow across the fin, and to create turbulence and vorticity to further improve mixing of the fluid and heat transfer.

Abstract: A rack assembly for mounting one or more plug-in type electronic/electrical modules in an aircraft or the like. The assembly provides mechanical isolation to the modules by way of at least two resilient strips positioned on opposite sides of the shelf on which the modules are mounted. The assembly further includes an air plenum disposed adjacent the underside of the shelf for providing cooling air to the modules. The mechanism for providing mechanical isolation performs the additional function of forming part of the plenum. This dual function feature minimizes the amount of space consumed by the disclosed rack assembly.

Abstract: A recuperative tubular heat exchanger comprised of a plurality of tube-bundle heat exchange modules (20) stacked in a spaced array and interconnected by U-shaped, open-end header conduits (30) to form a serpentine flowpath through which a fluid to be heated is passed in heat exchange relationship with a heating fluid passing in cross flow over the tube bundle modules. The interconnected modules together with the header conduits form an integral assembly which is free to slide on support beams (26) so as to float within the housing (12) of the heat exchanger in response to the thermal deformation of the tube bundle modules.

Abstract: A one-piece turbulator comprising a rectangular frame with two laterally spaced parallel bars having corresponding ends interconnected by end cross bars, and cross-pieces in the frame. The cross-pieces have a portion extending between the parallel bars, and a further portion projecting perpendicular to a plane defined by the axes of the parallel bars.

Abstract: A quarter turn actuator comprises a body (10) defining side-by-side cylinders (11 and 12), a piston (13) in each cylinder having in one side thereof a recess in which is provided a rack (15), a pinion (16) mounted in the body and engaging the racks on the pistons, a source for supplying compressed air to the cylinders and an air distribution system interconnecting each end of each cylinder with the other end of the other cylinder. The body (10) is preferably molded of plastic material and the cylinders are lined. The pistons may also be molded plastic material.

Abstract: The agricultural harvester 10 cooling system includes a heat exchanger 38 for cooling an internal combustion engine 32 and a heat exchanger air cleaner assembly 36. The heat exchanger air cleaner assembly has a fixed screen 62 adjacent the heat exchanger 32 which forms one wall of a large box 45. Channel members 64 and 66 and flat bars 68 hold the fixed screen 62 in a plane and form a plurality of pie-shaped compartments. The air cutoff plate 78 on rotatable shaft 72 closes the pie-shaped compartments and substantially blocks the flow of air through the fixed screen 62. A suction pipe 84 adjacent the fixed screen 62 and inside the large box 45 rotates with the rotatable shaft 72 directly across the fixed screen from the cutoff plate 78. The suction pipe 84 is connected to the intake of a centrifugal blower 118 by a vacuum pipe 96.

Abstract: A gas/liquid, parallel flow heat exchanger in a waste-heat tank which is constructed as a pressure tank, is charged with coolant, and is connected after a pressure gasification. The waste-heat tank includes conduit-like elements of equal length which serve as heat transfer surfaces and are installed in conduit-like components or wall units. The wall units divide the interior of the waste-heat tank into regions having upwardly and downwardly directed fluid flow. A central, coaxial, polygonal, preferably hexagonal, cylindrical displacement body is provided, with the number of surfaces of the displacement body depending upon the number of heat transfer surface elements. Also provided are wall units which project out of the wall of the container of the waste-heat tank into the interior thereof across from the corners of the polygonal displacement body. Cylindrical displacement bodies are located centrally between the corners of the polygonal displacement body on an imaginary circle.

Abstract: A vacuum booster device which is mainly used to operate a master cylinder for hydraulic brakes or the like of automobiles. The device is so constructed that the inner peripheral bead of the diaphragm disposed within the booster shell and the clamping band adapted to clamp the bead tightly are fitted in the annular fitting groove formed in the rear surface of the booster piston, a part of the inner peripheral bead is formed as a thin-walled elastic valve portion which is in close-contact with the inner surface of the annular fitting groove in a separable manner and which engages with the notched recess formed in the rear side wall of the fitting groove, and the relief is provided between the valve portion and the clamping band to allow deformation of the elastic valve portion. Thus, when the pressure within the first working chamber is increased, air can be discharged from the first working chamber to the second working chamber through a gap made in the relief region due to deformation of the valve portion.

Abstract: A vertically extending heat exchanger is provided in which an elongated dasher is rotatably mounted within an upright cylindrical chamber. The exterior surface of the dasher coacts with the interior surface of the chamber to form a product flow passage. The opposite side of the chamber interior surface is in contact with a heat exchange medium. The dasher is selectively movable longitudinally of the chamber between operative and inoperative modes. When in the operative mode, the dasher is fully assembled within the chamber and is supported at opposite ends by upper and lower endwall assemblies, the latter being mounted, respectively, on the upper and lower exterior end portions of the chamber. The dasher is movable to the inoperative mode when the lower endwall assembly is disassembled from the chamber and the dasher is lowered through the lower end portion of the chamber.

Abstract: A hydrostatic transmission including a pump and motor unit wherein the pump unit is displaceable effectuated by an operative member integral to the pump unit. A neutral start switch communicating with a carrying machine is mounted in the pump unit to contact the operative member in a manner causing the neutral start switch to become operative only when the operative member is assuming a neutral position.

Abstract: A flushing valve system suitable for use in a closed circuit hydrostatic transmission including a variable displacement hydraulic pump, a hydraulic actuator and two main lines. The flushing valve system includes poppet valves mounted in passages for respectively communicating the main lines with a fluid tank, passages mounting throttles for causing the pressure in the main lines to act on pressure chambers to keep poppets of the poppet valves from moving to an open position, and a change-over valve responsive to the pressure differential between the main lines to communicate the pressure chamber of the poppet valve connected to the main line on the lower pressure side with the fluid tank. The poppet valve connected to the main line on the lower pressure side opens when a predetermined pressure level is exceeded by the pressure in the main line, to thereby allow working fluid in the main line to be drained to the fluid tank.

Abstract: An actuator system for controlling the position of an aerodynamic control surface of an aircraft, such as an aileron, is disclosed. An actuator (12) having an output shaft (14) is mounted to a frame attached to the aircraft structure. A hydraulic coupling (32) is mounted on one side to the output shaft (14) of the actuator (12) and the other side to the control surface (50) and comprises a hydraulic cylinder (34) having a sealing member (36) movably mounted therein dividing the cylinder (34) into two portions (38, 40). The output shaft (14) of the actuator (12) is coupled to the cylinder (34) and an output shaft is attached to the sealing member (36) at one end and at its opposite end to the control surface or vice versa. A connecting tube (54) is provided coupling the two portions of the hydraulic cylinder together. The tube incorporates a valve (58) having a first position sealing off the two portions from each other and a second position providing a passageway therebetween.

Abstract: A control device for a hydrostatic transmission including apparatus for sensing a speed of a prime mover which powers a variable displacement pump of the hydrostatic transmission and for regulating the displacement of the variable displacement pump in accordance with the speed of the prime mover, is disclosed. The control device also includes apparatus for transmitting a mechanical feedback signal representative of the displacement of the variable displacement pump to the control device to maintain the variable displacement pump at a displacement proportional to the speed of the prime mover.

Abstract: A control system for controlling the movement of the slide of a hydraulic press of the type having a main cylinder containing a piston mounting the slide. The control system comprises an electronic processor, a pressure transducer to measure the pressure of hydraulic fluid applied to the piston to move the slide downwardly, a position encoder coupled to the slide to determine the vertical position of the slide, and a hydraulic circuit to supply hydraulic fluid under pressure to the cylinder to move the piston and slide upwardly and downwardly. The hydraulic circuit comprises a plurality of cartridge valves having controls actuable by outputs from the processor.