Abstract: A method and apparatus are disclosed for establishing a random fault limit for hoppers in a collating machine. A plurality of hoppers are arranged in an array, each adapted to feed signatures, one at a time, to a conveyor. A miss feed base number and a double feed base number is established in a microcomputer for each of the hoppers equal to either (i) a predetermined number of signature feeds by that hopper, (ii) a predetermined number of books assembled, or (iii) a predetermined number of collator machine cycles. A miss feed fault number and a double feed number is established in the microcomputer for each of the hoppers. Each hopper has an associated miss feed detector and a double feed detector electrically connected to the microcomputer.

Abstract: A propeller system has a pair of hub assemblies driven in counter-rotation, each hub assembly having a mechanical pitch change actuator, each actuator being provided with a pitch lock that rotates simultaneously with the motion of the actuator to allow the actuator to set propeller blade pitch, but locks the propeller blade positionally when not rotating simultaneously with the actuator, and a differential for transmitting a pitch change signal across a rotating gap between the two hub assemblies and for providing power to a means for providing the pitch change signals. A pair of motors provide the rotative signal to set the pitch of the blades in each hub assembly. One of the pair of motors drives the actuator towards high pitch and the other motor drives the actuator towards low pitch. A synchronizer coordinates the signals of the first and second motors so that a pitch lock moves simultaneously with the actuator.

Abstract: A regulating method for preventing surges in a turbocompressor by initiating blow-off when necessary during operation. Flow to the turbocompressor and the compressor outlet pressure are measured continuously, and a first regulating difference is calculated from these measurements. This first regulating difference is then applied as an input parameter to a regulator which has a limited response rate. The output of this regulator is then used as a regulating parameter for a blow-off valve. The blow-off valve is opened rapidly by safety controls under malfunctioning conditions that tend to stress the limited response rate of the regulator. A second regulating difference is calculated from the preceding measurements or from the first regulating difference to indicate the need to open rapidly the blow-off valve.

Abstract: A universal fan blade mounting assembly including an elongated bar having flanges at each end. One of the flanges is shaped to cooperate with one end of a fan blade and the other flange is constructed for attachment to a ceiling fan rotor. The rotor connecting flange includes two holes therein one of the holes is round for encircling a fastening screw. The other hole forms an arcuate slot. The hole and slot cooperate such that the elongated bar extends outwardly from the center of the rotor such that the functional relationship between the fan blade and the rotor may be maintained.

Abstract: In a preferred embodiment of hydraulic actuator wherein a piston rod is longitudinally positionable via a tail end of a cylinder, tail-end static and dynamic seal members are of plastic, of relatively elongate trapezoidal section, and a single metal spring axially preloads the two seal members in compression, via the series-related respective ends of the seal members. Engagement with the ends of each seal member are frusto-conical, to substantially match the sloped ends of the trapezoidal section, and the slope directions of these seal-member engagements are (in the case of the dynamic seal) such as to locally impart radially inwardly directed force, to drive outer ends of the seal into circumferentially uniform engagement with the piston rod of the actuator; in the case of the static seal the slope directions of seal-member engagements are such as to impart radially outwardly directed force, to drive outer ends of the static seal into similar engagement with the bore of the cylinder.

Abstract: A brake booster which includes a control slide that is displaceably supported in a servo piston and acted upon by a piston rod under the influence of brake pressure. The control slide has bores that establish communication between a pressure chamber and a pressure source or return for power brake fluid in the pressure chamber. The control slide is intended to penetrate a control bush in a stepped bore in the servo piston, which has a radial bore for connecting the pressure source with a radial bore in the control slide toward the pressure chamber. The control bush is supported radially movably in the stepped bore.

Abstract: An electrohydraulic system for control of a variable output pump includes a microprocessor-based controller receiving inputs from condition sensors coupled to the pump and command inputs from a remote master controller. The controller supplies outputs to an electrohydraulic valve for metering hydraulic fluid to a pump control port and thereby controlling pump operation in any one of a number of preselected and prestored pump control modes. A hydromechanical valve is connected in parallel with the electrohydraulic valve for controlling pump operation in the event of electrical malfunction or failure. Circuitry connected between the pump condition sensors and the control computer prevents aliasing errors due to mismatch between the computer sampling frequency and pump speed.

Abstract: An assembly for a cylindrical cage which includes vanes made up of blades and end lugs. The end lugs and vanes are attached to a frame by a ring element with a fastener securing the ring element, end lug and blade to the frame. The end lugs are dimensioned and shaped so that when the end lugs of adjacent vanes are nested together, the vanes are spaced apart the desired amount and the angular relationship between vanes is maintained so that the gas flow path between adjacent vanes has the desired configuration. The blades can be made separate from or integral with the end lugs. The invention is particularly designed for use in mounting guide vanes in a cage type air classifier for classifying particulate materials.

Abstract: Main brake cylinder (1) with brake fluid container (6). A valve (10) is arranged in the connection between the container and the interior of the cylinder. If the container becomes detached from the cylinder, the valve is closed automatically and prevents brake fluid from running out.

Abstract: The setting of the dead travel of a servo-motor for assistance during braking is carried out in the factory during its assembly. For this purpose, a subassembly (68) comprising the piston (20), the operating pushrod (30) and its plunger (28), the valve head (34), the springs (38, 40) and the fixed (44) and tilting (50) keys, is placed in a setting sleeve (70). A load (F1) is exerted on the front face of the piston (20) sufficient to maintain a bearing surface (20b) permanently against a reference surface (70a) formed on the sleeve, and the pushrod (30) is freed from the action of the spring (40) by means of a fork (70a) formed on the sleeve, and the pushrod (30) is freed from the action of the spring (40) by means of a fork (72), after having pushed the plunger (28) up against the valve head (34) by applying a load (F3), the movement (.DELTA.) made by the mobile key (50) is measured between the reference surface (170a) and a shoulder formed on the plunger (28).

Abstract: An apparatus and method for controlling a collator having a plurality of delivery conveyors are disclosed. The collator includes a plurality of hoppers for feeding a plurality of signatures to a plurality of gathering stations or pockets which moves past the hoppers. An assemblage, i.e., a group of collated signatures is formed in each of the plurality of pockets. The plurality of delivery conveyors receives assemblages from the plurality of pockets during operation of the collator. If a fault condition is detected downstream of one of the plurality of delivery conveyors, then receipt of assemblages by the one delivery conveyor is interrupted while receipt of assemblages by the other of the plurality of delivery conveyors is maintained. The result is that only the one delivery conveyor with the downstream fault condition ceases delivering assemblages. All production from the collator does not cease. Production and delivery of assemblages onto the delivery conveyors with no fault condition are maintained.

Abstract: The present invention provides a process for feeding transparency sheets having a soft coating thereon from a tray of such sheets. The transparency sheets are interleaved with plain paper separator sheets in a tray so that at the front end of the tray, the ends of the plain paper separator sheets extend beyond the ends of the transparency sheets. A sheet feed means positioned adjacent the front end of the tray engages the extended end of the first of the plain paper separator sheets in the tray. At start up, the sheet feed means does not engage the transparency sheets. The sheet feed means moves the engaged plain paper separator sheet from the tray wherein the movement of the engaged plain paper separator sheet moves the adjacent transparency sheet from the tray.

Abstract: Each blade includes at its root a root portion that slides axially into a re-entrant cavity that extends axially in the hub. End caps prevent axial removal of the blade roots from the hub. Thus, it is possible to replace an individual damaged blade, and the hubs are interchangeable from ship to ship, although the blades may vary slightly. All of the parts are injection molded of a high-strength fiber-reinforced plastic. The entire assembly can be produced at approximately half the cost of conventional metal propellers. The propeller is intended for use with engines developing 90-250 HP, and the diameter of the propeller is 16-18 inches. The various parts includes apertures and passages so as not to interfere with the discharge of exhaust gases.

Abstract: A method of controlling a sheet sorter wherein the sheet sorter includes a plurality of bins for accommodating sheets, the bins being arranged in a vertical direction, a first sheet discharging device for discharging sheets not to be sorted, second sheet discharging device, disposed with a vertical interval from the first sheet discharging device, for discharging sheets to be sorted, bin moving device for moving substantially vertically the bins and stapler device for stapling the sheets, the method includes providing the stapler adjacent to the first sheet discharging device; accommodating the sheets on the plurality of bins of sequentially opposing the bins to the second sheet discharging device, and stapling the sheets on the bins by the stapler, when a sorting mode and a stapling mode are selected; discharging the sheets by the first discharging device and accommodating them on a the bin when a non-sorting mode and non-stapling mode are selected; and discharging the sheet by the second discharging device

Abstract: The feedback chamber of the pilot pressure valve is supplied with its discharge after it has been filtered whereby the pressure which is supplied to the feedback chamber is subject to the flow restricting effect of the strainer and increases the valve output to compensate for the flow restrictive nature of the strainer.

Abstract: The present invention relates to fixed-angle keying pieces for blades of axial fans each having a U-shaped cross section, the internal surface of which perfectly fits the profile of the blade while the external surface of the same has a plane side face which rests on a supporting plate, the keying piece being obtained as a continuous extruded section which is subsequently cut to a desired size.

Abstract: A hydraulic cylinder-piston unit comprises primary cylinder-piston unit with an integrated position regulation and with a primary cylinder and a primary piston movable in the primary cylinder, two displacement chambers in the primary cylinder and including two displacement pistons, a displacement piston rod connecting the displacement pistons with one another, and a separating wall, and differential cylinder-piston unit formed by the primary piston and having a differential cylinder provided with working chambers.

Abstract: A compressor stage or a turbocharger having a compressor stage having an inducer shroud with two or more vents. A first vent is provided with a second vent upstream thereof, allowing for outflow during surge conditions and inflow during choking conditions. Surge line characteristics may be varied by selectively locating the position of the first and of the second vents, and by selectively determining the effective width of the vents. The vents may be circumferential slots, and may be slanted. An outer shroud is provided forming a venting chamber for recirculation of gas into the gas intake. A third vent may be provided to vent the diffuser.

Abstract: A hybrid metal composite rotor hub retention plate having high strength and reduced weight. The retention plate comprises a metallic perimeter support structure and a plurality of metallic spokes that extend inwardly from the perimeter structure to a hub. The perimeter structure, hub and spokes define at least three holes. The perimeter structure and spokes have upper and lower surfaces. Fiber reinforced resin matrix composite capable of reacting to bending loads, in-plane shear and axial loads is bonded to the upper and lower surfaces. The hybrid metal composite rotor hub retention plate is made by forming the metal structure and using the metal structure as a mold for the fiber reinforced resin matrix composite.

Abstract: A refrigerant compressor construction including one or more cylinders and pistons and a cylinder head mounted over the end of the cylinders, the head having a base, a first wall providing a suction chamber and a second wall providing a discharge chamber, each of the walls being unitary with the base and spaced from each other to provide a thermal barrier between the chambers to minimize suction gas heating.