Abstract: What follows is a description of a method of fabricating a composite assembly. In particular, the composite assembly comprises an aerodynamic rotor blade assembly which is fabricated utilizing a single matched die mold. Before utilizing the single matched die mold, the aft fairing structure of the composite blade assembly is formed. This aft fairing structure is uniquely characterized in that it includes not only the typical elements of an aft fairing structure of the composite blade, but the spar heel as well. The aft fairing structure thusly formed is then placed into the single matched die mold with the spar, nose block, cap member and deicing blanket, or with various subassemblies thereof, and the various parts brought into engagement and secured to each other in the single matched die mold through the application of heat and pressure.

Abstract: A simplified layup mandrel with no contour or twist is utilized by the method of this invention for forming the spar member of an aerodynamic rotor blade. A fiber glass tape is wrapped (laid-up) to a desired thickness onto the simplified mandrel to form a strap as the initial step. Because of the simple design of the mandrel, the laid-up strap when removed from the mandrel has a basic U-shaped configuration with straight extending legs having substantially parallel vertically oriented faces. This strap is then placed on a forming mandrel and contoured to the desired shape either by hand or by coining in a forming die. The contoured strap is then utilized in any of the various subassemblies or final assembly of the composite aerodynamic rotor blade.

Abstract: This disclosure relates to an improved apparatus for preconditioning of the fuel-air mixture in the induction tube of a mixture compressing and externally ignited internal combustion engine in which the throttle valve is provided with a multiple vaned valve structure that is pivotable about an axis extending transversely of the induction tube.

Abstract: A control circuit for a fuel injection system used with internal combustion engines, of the type in which fuel injection valve control pulses are generated whose duration depends on engine data, in particular engine rpm and air flow rate. To avoid misfires when the engine is run fast with a closed throttle, the fuel supply is shut off by suppression of the fuel control pulses. For this purpose, the control circuit generates a reference rpm value and a reference pulse train of predetermined pulse duration and compares the duration of the actual fuel injection control pulses with the predetermined duration and, at the same time, it compares the actual rpm with the reference rpm. If the actual pulse duration is less than the reference duration and if the actual rpm is greater than the reference rpm, the control circuit suppresses the fuel injection control pulses.

Abstract: An externally ignited four cycle internal combustion engine equipped with an inlet valve and an outlet valve. In one embodiment a swirl (turbulence or vortex) chamber is provided within the cylinder head, the height of the swirl chamber being less than its maximum diameter. An outlet closable by the outlet valve is located in the upper portion of the swirl chamber. A channel-like recess, which creates a guide channel when the piston is in its top dead center position, terminates approximately tangentially in the swirl chamber. The channel-like recess may be formed in the cylinder head, in the top of the piston or partially in both of these members. In another embodiment, a reduced throat area is adapted to introduce the gases from the first inlet valve chamber to an oval secondary chamber adjacent to the outlet valve.

Abstract: The mixture control system of an internal combustion engine which employs an exhaust gas oxygen sensor is provided with circuitry which subjects the output signal from the sensor to comparison with established threshold values to determine the operational readiness of the sensor. When the amplitude of the sensor signal is sufficiently high, indicating proper operational temperature of the sensor, the test signal is turned off and the monitoring is taken over by a circuit which looks for regular alternation of the sensor signal at a sufficiently rapid rate. When the sensor signal is found inadequate for any reason, the closed loop control system is disengaged and the mixture control is provided on the basis of an average sensor voltage supplied by the circuit.

Abstract: The invention relates to a fuel injection pump for internal combustion engines provided with a reciprocating and simultaneously rotating pump piston which serves as a fuel distributor and an associated cam drive mechanism arranged to actuate the pump piston, the cam drive including a cam disk which runs on rollers and in turn is coupled both with the drive shaft of the pump and the pump piston.

Abstract: A method for simultaneous qualitative and quantitative analysis of antigens r antigen-effective substances in a sample provides placing the sample in a carrier medium through which it migrates toward a plurality of physically separate carrier strips. The medium on each strip contains a quantity of a specific ingredient, for example an antibody, which is expected to undergo a specific immunoreaction with one of the constituents in the sample, thereby producing a visible precipitate. The dimensions of the final precipitate then permit a direct measurement of the identified substance. A known concentration of a calibrating substance may be added to the sample to provide for calibration precipitates in the various strips. The apparatus for practicing the method includes a base plate on which the neutral, antibody-free carrier medium as well as the various strips containing media with antibodies or other immunoreactive ingredients are located.

Abstract: A master cylinder for a two-circuit brake system which includes an anti-skid control has two separate chambers and pistons. The main control piston is associated with a booster piston which it engages after a predetermined amount of travel. The brake pedal is arranged to actuate inlet and outlet valves and a selector piston provided with an array of longitudinally disposed rods is arranged to actuate the inlet valve.

Abstract: The invention relates to improvements in a fuel injection nozzle for internal combustion engines having a mechanically driven transport piston and a coaxial slave piston slidably arranged in a cylinder, said pistons being arranged to enclose between them an equalizing chamber fed from a line carrying a low pressure fluid and with the line being closed by the boundary edge of the transport piston which faces the equalizing chamber, and more particularly to a structure wherein the fluid in said equalizing chamber as well as that in the pressure line extending to a pressure chamber arranged to receive a needle valve is controllable by means of said slave piston to terminate the fuel injection.

Abstract: A container made from a foil or laminate material and provided with a cover which is sealed to a flange of the container by the application of heat. In order to facilitate removal of the cover, all or all but one of the corners of the container have cuts or kerfs extending from the outer edge up to the welded bead. To open the container, the tab defined by each kerf is grasped and pulled upwardly so that the adjacent strip of cover and flange is removed by tearing along one straight side of the polygonal container. The procedure is repeated at successive sides until all or all but one of the edge strips have been removed.

Abstract: A fuel injection nozzle for internal combustion engines which includes a blind bore disposed transversely to the axis of the nozzle, in which bore is provided an adjustment mechanism for exteriorly varying the pre-loaded tension of a closing spring acting on the needle valve of the fuel injection nozzle. Plural embodiments disclose that variance in the spring loading is achieved by rotating the adjustment mechanism through different positions to urge the spring downwardly against a cap retaining the spring. The adjustment mechanism is sealed against fuel leakage from the bore and retained therein by the force of the spring plate on a surface cooperative therewith.

Abstract: A horn speaker comprising a diaphragm positioned close to a throat and side walls forming sound passages for radiating the vibrations of the diaphragm effectively as sound waves from the mouth of the speaker.

Abstract: An apparatus for comparing frequency of an object signal with a given reference frequency, with a reference signal generator for developing a reference signal having the reference frequency. If the object signal is frequency-modulated, then its center frequency is compared with the reference frequency. A switching signal generator, switching circuitry actuated by the switching signal, a frequency discriminator, low-pass filters and a voltage comparator are also provided. Actuated by the switching signal, the discriminator alternately discriminates the frequencies of the object and reference signals, and the averaged discrimination output voltages are compared by the comparator to give the indication of comparison of the frequencies of the object and reference signals.

Abstract: A fuel injection system for externally ignited internal combustion engines in which a fuel metering and distributing valve is controlled by an air sensing element disposed in the air suction tube of the engine and by structure which is adapted to alter the restoring force exerted on the air sensing element through the fuel metering and distributing valve. The noted structure includes a control pressure conduit, a pressure control valve connected to the control pressure conduit and a further conduit for connecting the pressure control valve to the suction tube of the engine downstream of the butterfly valve. With this structure it is possible to alter the restoring force mentioned above so that a properly proportioned fuel-air mixture is achieved, and in particular, so that a properly enriched fuel-air mixture is achieved during full load operation.

Abstract: A fuel injection system for externally ignited internal combustion engines in which a fuel metering and distributing valve is controlled by an air sensing element disposed in the air suction tube of the engine and by structure which is adapted to alter the restoring force exerted on the air sensing element through the fuel metering and distributing valve. The noted structure includes a control pressure conduit, a pressure control valve connected to the control pressure conduit and further conduits for connecting the pressure control valve to the suction tube of the engine downstream of the butterfly valve and between the air sensing element and the butterfly valve. With this structure it is possible to alter the restoring force mentioned above so that a properly proportioned fuel - air mixture is achieved for various load changes of the internal combustion engine.

Abstract: A control circuit for a fuel injection system of an internal combustion engine supplies a corrective current to the main multivibrator during and/or after engine starting. The corrective current is supplied on the basis of temperature dependent signals and on the basis of the pulse width of the primary injection signals, which is related to engine rpm and load.

Abstract: Consolidation construction for soft, unstable foundation for improving the bearing strength in order to fill earth thereon as in land reclaiming or to build structural construction thereon including dikes and roads. Examples of such unstable foundation requiring consolidation are: sea bottom with soft unsolid sedimentation heap as often referred to recently in Japan as HEDORO, muddy swamp land, layer of slimy industrial waste sludge of much water content and the like. Consolidation is effected on the spot by admixing hardening agent, such for instance as cement, with the slimy mud heap constituting the soft, unstable foundation.

Abstract: A fuel supply system for internal combustion engines includes a fuel reservoir adjacent the induction manifold from which fuel is aspirated depending on pressure differences in two separate regions of the manifold.An electric controller reacts to engine rpm and exhaust gas composition signals to actuate electromagnetic valves in the air conduits leading from the manifold to the fuel reservoir. Various valve opening schedules can be performed depending on the desired fuel mixture.

Abstract: What follows is a description of a device for the dispersion of a powder in a liquid, wherein the powder has a considerable solvation capacity. The device includes a unit for supplying liquid and forming the liquid into a flow passage which envelopes the powder, and an atomization unit for receiving the powder and enveloping liquid to produce the desired dispersion of the powder.