Abstract: A control device for a hydrostatic drive for at least two actuators, having a variable displacement pump whose adjusting device is acted on in accordance with the displacement and/or the flow pressure, wherein each actuator has associated with it, in its hydraulic supply line, a control valve and a preceding displacement controller in the form of a pressure compensator, is simplified while ensuring accurate control. This is achieved by associating with the control device an electronic regulating device which, depending on a measuring element that detects the opening position of the pressure compensator, controls, by means of an adjusting member associated with the adjusting device, the displacement setting of the pump, increasing it as the opening of the pressure compensator(s) becomes larger and decreasing as the opening becomes smaller.

Abstract: A zigzag folding apparatus has conveyors for transporting a zigzag folded web from a folding station to a discharge station, and an adjustable web cutter for separating the web at adjacent folds into groups of folded web segments during the process of transporting the web and before the web reaches the discharge station.

Abstract: A hydraulic device includes a piston slidable within a cylinder. Fluid under pressure is admitted to one end of the cylinder through an inlet which contains a restrictor. The piston is formed with an orifice and is biased by a first spring towards the one end of the cylinder. A thrust rod is engageable by the piston to transmit the movement of the piston to an external mechanism. When the piston is moved by rising fluid pressure the orifice is closed by the end of the thrust rod so that a higher value of fluid pressure is required to effect the initial movement of the piston than is required to allow the return movement of the piston.

Abstract: To insert a plurality of insert sheets (2') simultaneously into multi-sheet products (2), for example folded inserts into already folded newspapers, a first carrier structure (3,3') retains the multi-sheet products in essentially open V-shaped position. A second carrier structure, located above the first carrier structure, retains the insert sheets. In accordance with the invention, for insertion, an auxiliary holder (19-26) grips insert sheets from the second carrier structure and, upon spreading apart of the first carrier structure, and downward movement of the auxiliary holder, transfers the inserts into the multi-sheet products. If the first carrier structure does not retain any multi-sheet products, the arrangement can also be used for transfer from one carrier structure to another and also to remove defective sheets from the second carrier structure by gripping them and depositing them on a defective-sheet transport belt (54).

Abstract: A fluid energized double acting motor is provided for use as the drive for reciprocating mechanisms such as paint pumps for airless spray painting. A piston within the pump housing is moved by pressurized fluid controlled by an automatic reversing valve including spaced check valves. The check valves are selectively seated and unseated by a spring biased piston and fluid pressure controlled valve actuator assembly. The reversing valve system includes anti-stalling features and is of single, low cost, field repairable nature. The motor system also includes features to prevent chattering oscillation due to abrupt changes in motor load.

Abstract: A pump has a shaft and a housing containing pressurized fluid and employs a rubbing-type sealing assembly for sealably and rotatably mounting the shaft within the housing. The sealing assembly includes an annular runner mounted around the shaft for rotation therewith and an annular seal ring mounted within the housing in non-rotational relationship thereto. The runner and seal ring have surfaces facing and in rubbing contact with one another. A coating of titanium nitride is incorporated on at least one of the surfaces. The coating of titanium nitride can be deposited as an outer hardface layer on the one surface, or, alternately, as an inner passivating barrier layer upon the one surface and then a coating of chromium carbide can be deposited as an outer hardface layer on the coating of titanium nitride.

Abstract: Apparatus and methods are disclosed for acoustically detecting different conditions of boiling occurring within a liquid and developing useful control signals correlated to the detected boiling condition. Distinctions are made between no-boiling, sub-cooled boiling, and full or rolling boiling conditions.

Abstract: Reversible hydraulic motors drdiven by fluid from variable displacement pumps are useful in driving various mechanisms of earthmoving machines. It is desirable to control both the speed and direction of the motor with a single lever. The subject hydraulic control system includes a selector valve which has a fluid control section for directing pilot fluid to a reversing valve to reverse the direction of the motor. A signal control valve is mechanically actuated by movement of the selector valve to the operating position so that a regulated pressure control signal is directed to a displacement control of variable displacement pump to regulate the volumetric output of the pump and thus the operating speed of the motor.

Abstract: Each blade (2) of a propeller fan projecting radially outwardly from the outer peripheral surface of an annular boss (1) has on at least part of its suction side (3), a coarsened surface (4).

Abstract: A composite gas turbine blade consists of an airfoil (1) in an oxide-dispersion-hardened nickel-based superalloy, in the condition of longitudinally directed coarse columnar crystals, and a shroud plate (6) or a shroud and a root (7), the latter items in a non-dispersion-hardened nickel-based superalloy (cast alloy). The gas turbine blade is manufactured by casting in and casting round, using the non-dispersion-hardened superalloy mentioned, the tip end (2) and root end (3)--provided with depressions (4) and/or protrusions (5)--of the airfoil (1), after preheating the latter to a temperature of between 50.degree. and 300.degree. C. below the solidus temperature of the lowest melting phase of the airfoil material. The casting temperature for this should be a maximum of 100.degree. C. above the liquidus temperature of the highest melting phase of this non-dispersion-hardened alloy. Any melting onto the airfoil (1) and any metallurgical connection is to be avoided.

Abstract: A high speed liquid vortex pump is fitted with a flexible tube in the discharge throat. The flow area of the flexible tube, and thus the pump output flow rate, is varied by surrounding the tube with a pressure modulated stream of the working fluid.

Abstract: A signature opening apparatus for receiving one signature at a time from a source of signatures fed to the apparatus in a steady stream. The apparatus includes an opening drum mounted for rotation on a shaft for delivering opened signatures to a continuous signature carrying chain. It utilizes at least one gripper assembly mounted for rotation with the opening drum for opening one signature at a time. The apparatus also includes a timing mechanism to allow the gripper assembly to initiate gripping of signatures at a first preselected point, to fully grip signatures at a second preselected point and to release signatures at a third preselected point. The gripper assembly includes an elongated countinuously curved finger having a first end mounted for rotation relative to the opening drum and a second end normally projecting beyond the opening drum. The apparatus also includes a seat as a part of the gripper assembly to be engaged by the second end of the finger.

Abstract: A compressor driven by a motor delivers air under pressure to a plurality of paint spray guns. An air circulation fan is incorporated with the motor to cool the apparatus during operation. The compressor shaft includes bearings on each end and the bearing on the lower end is physically separated from the lower end of the compressor to prevent oil contamination of the air being discharged. A pump is associated with the separated bearing which delivers oil to lubricate the bearing when the compressor is in operation.

Abstract: A temperature controlled rotating seal (46) includes an annular runner (48) having knife edges (50) and a surrounding static shroud (44). Baffles (64, 66) extend radially from the adjacent rotor (10) and a static stator vane assembly (36), forming a plurality of annular mixing volumes (60, 62) disposed upstream of the seal (46). Cool air (70) is provided to the innermost mixing volume (62) thereby controlling the local gas temperatures at the rotor periphery (14).

Abstract: A pump housing, particularly meant for pumps of high yield and low lift, has a suction casing, a suction mouth and a volute arranged in the concrete substructure of a pump station. The volute is made by assembling thin-walled mould wall parts, mounting them in place, and thereafter casting fresh concrete around the resulting mould wall, thereby ensuring that reinforcing elements of the mould wall are connected with reinforcing elements of the concrete to be cast. The suction casing and suction mouth are preferably made in the same way. Thus, the use of complicated casings for casting concrete elements can be avoided.

Abstract: A radial turbine of a variable area nozzle type which is suitable for use as the exhaust turbine of a turbocharger for an automotive internal combustion engine requiring a quick response and a wide operating range. This turbine comprises at least two groups of variable area nozzles which may be, for instance, defined by moveable vanes, and can be individually controlled for each group to vary their sizes. By opening the variable area nozzles of the first group while the variable area nozzles of the second group are kept closed, a sufficient supercharging effect can be obtained even when the fluid flow rate is small. By opening the variable area nozzles of both the groups, the resistance to the fluid flow can be reduced and the creation of excessive back pressure at the inlet to the turbine can be avoided even when the fluid flow rate is large. In this way, not only the operating range of the turbine can be expanded but also the control accuracy particularly in small nozzle opening condition can be improved.

Abstract: A composite member includes circumferentially extending ceramic fibers in a metallic matrix. A rotor member integrally includes such a ceramic fiber/metal matrix composite member to reinforce a homogeneous remainder portion of the rotor member with respect to centrifugally induced stresses. Method of making are included in the disclosure.

Abstract: A hydraulic flow divider has first and second flow control valves each dividing its inflow into two flows. The first flow control has a pressure relief valve and a constant orifice dividing flow to two outlets. The second flow control further divides one of these flows into a second set of two output flows. One of the output flows of the second flow control valve is directed to a power steering cylinder while secondary output flow of the second flow control valve joins flow from the other outlet of the first flow control. The arrangement secures adequate fluid supply to a priority load of the hydraulic system at low pump drive engine speeds.

Abstract: A split ring seal of a centrifugal pump comprises two rings that consist of a sintered material and that are respectively connected in a frictional or positive manner to a front cover disk of the impeller and to the pump housing which are made of a cast polyamide as produced by the activated anionic polymerization of monomeric laurinlactam.

Abstract: A hydraulic master cylinder piston carries a circumferential seal ring which allows recuperation flow valving. The floating seal has a reinforcing metal girdle which prevents radial expansion and axial crushing. The seal material resists extrusion and has an outer radius slightly greater than the radius of the circumferential girdle. A forward slotted bearing ring maintains the piston in alignment with the bore. During piston return, recuperation occurs through a path comprising the radial clearance between piston and floating seal ring and at least one slot or groove in the bearing ring. Upon full piston return, the seal is withdrawn from the master cylinder working chamber into a larger diameter bore communicating with the reservoir and thus allows relatively free make-up flow.