Abstract: A vacuum brake force booster is provided wherein the pressure column above the immersing valve plunger of the dual valve contained in the piston chamber, in the applied position, generates a reaction force imparting to the vehicle drive the feeling of the extent of deacceleration. In addition to the valve plunger coupled to the push rod of the brake pedal, the control housing in the piston chamber is displaceable in the brake housing along with the movable wall and acts as a plunger piston. For this purpose, the control housing is sealingly passed through a wall of the master cylinder. The intermediate piston separating the two piston chambers in the master cylinder at the front side thereof facing the valve piston is provided with a rubber reaction disc. The valve plunger and the control housing or a sleeve cooperating with the control housing, in the event of a failure of one of the brake circuits, will abut the reaction disc.

Abstract: A tandem master cylinder which has a compensating bore in communication with a chamber on the rear side of the master piston. The bore is provided in the front wall of master cylinder piston and is adapted to be closed by means of valve body movable relative to said master cylinder piston. The valve body is provided on the end of a central clamping element interconnecting the two spring retainers of a piston restoring spring of master cylinder piston. The valve body is urged against compensating bore as soon as the piston restoring spring is loaded. In order to maintain a predetermined filling pressure in the chamber behind the master cylinder piston and in the output position of the piston in pressure chamber, the piston restoring spring is supported on a spring retainer that is held through a stop on the cylinder housing.

Abstract: An ultrasonic flowmeter arrangement has a pair of electroacoustic transmit/receive transducers located in opposite walls of a pipe, the transducers being longitudinally displaced and facing one another, thus forming a bidirectional transmission path oblique to the direction of fluid flow in the pipe. Each transducer is driven by a voltage controlled oscillator operating sometimes at nominally the same frequency. In one case the oscillator outputs are divided down separately to provide two different transmission frequencies. Filters apply to phase comparison means corresponding transmitted and received frequencies. The outputs of the phase comparison means provide feedback control signals for the oscillators. The oscillator outputs are fed to a mixing means to derive a difference frequency signal as a measure of the rate of fluid flow in the pipe.

Abstract: A monolithically very large scale integrated circuit (VLSI) having any arbitrarily given structure and an internal test circuit only requiring one, two or three additional outer terminals wherein the test circuit is integrated therein. In one embodiment the test circuit contains a counter and a combinational circuit interconnected with the counter reading outputs thereof as well as selection switches associated with test points and where the first of the additional terminals is connected to the counting input of the counter.

Abstract: A windshield wiper control circuit is described wherein the time at which the wiper motor is deenergized after an operating switch has been switched off is determined by the wiper speed. The parking position of the wiper is thereby independent of the condition of the windshield.

Abstract: A windshield wiper assembly is disclosed which includes a pivot pin between the side walls of the main yoke. A connecting element for a wiper arm is mounted on the yoke. The wiper arm projects from the back of the main yoke and is bent such that it laterally extends beside the wiper blade.

Abstract: The circuit enables the selection of the upper or the lower tone of an electronic organ chord with regard to a switching signal. In response to said switching signal each tone frequency signal handled is either fed to the anode or the cathode of a switch component of a plurality of switch components connected in series whereas the switch components of the tone frequency signal not handled are switched on.

Abstract: A circuit arrangement for generating a pulse train having a predetermined first pulse spacing (a) and a second pulse spacing (b) differing from the first by an integral factor greater than one, which pulse spacings are assigned to the binary ZERO and the binary ONE, respectively, dependent upon a predetermined n-bit binary word.

Abstract: Porous silica doped with zinc is used as a p-type dopant source in the construction of rib lasers. This is preferable to the method used in the parent case of growing a zinc doped layer because epitaxial growth is liable to be accompanied by zinc diffusion into regions where it is not required. Other modifications include allowing the zinc diffusion to go right through the active layer and to dimension the device so that lateral optical guidance is unaffected by the rib.

Abstract: There is disclosed a caliper guide for a floating-caliper disc brake comprising parallel grooves in adjacent guide surfaces of the caliper and caliper support and roller elements supported in the grooves to movably connect the caliper and caliper support. By means of this caliper guide, low sliding forces are achieved without the occurrence of a clearance which could lead to disturbing rattling noises.

Abstract: Process of manufacturing semiconductor devices by providing on the surface of a substrate of one conductivity at first only a covering with a doping agent of the other conductivity and then, after the building of mesas, the PN-junction is formed by diffusion in an oxidizing atmosphere whereby simultaneously a protecting SiO.sub.2 layer is formed on the free surface of the mesa.

Abstract: A fluid flow sensor of the vortex shedding type. Pressure differentials caused by shed vortices operate a piston system to vary the coupling between a pair of optical fibers thereby modulating light signals passing along the fibers.

Abstract: A valve includes valve disks, one fixed and the other rotatable. The fixed disk includes in-flow and out-flow apertures. The rotatable disk is rotatable on a surface of the fixed disk to control through-flow volume and includes a semi-circular transfer flow passage recessed into its surface. The flow passage includes at least a tapered portion to provide more precise through-flow volume control.

Abstract: An optical fiber connector in which ferrules terminated to optical fibers are laterally aligned in a delta-shaped, longitudinally split spring sleeve.

Abstract: A method of selective plating, e.g. of gold on phosphor bronze, includes the steps of printing on the phosphor-bronze a mask which defines the area to be plated, electro-painting the unmasked areas in an electrolytic bath with an epoxy-phenolic paint, stoving the material so that the epoxy coat becomes a strongly adherent and chemically resistant layer, removing the mask produced in the first step in a suitable solvent, leaving the metal to be plated bare, and electro-plating. The epoxy coating may be left in situ or removed.

Abstract: A load-responsive brake-force regulator for a vehicular hydraulic brake system includes a balance beam having a variable point of support to determine the transmission ratio for the brake pressure, two rollers disposed in a cage to support the balance beam, an actuating tongue disposed between the two rollers and two compression springs between which the cage is disposed such that the cage is centered into the position determined by the actuating tongue.

Abstract: A braking pressure control unit for use on vehicles provides for dual-circuit braking of the rear axle. The braking pressure control unit comprises a braking force reducer including a stepped piston and a braking force limiter disposed coaxially and in series therewith. The closing member of the limiter bears directly against the stepped piston while the closing member of the reducer bears, in the rest position, against a stop independent of the limiter. As a result, the change-over point in one brake circuit will not change in the event of failure of the other brake circuit.

Abstract: A throttling arrangement for braking systems with antiskid control disposed between the pressure-control device and the wheel braking cylinders. The throttle is so designed that a valve passageway bypassing it remains open until a preset braking pressure is reached. This arrangement ensures rapid brake application in the lower pressure range while at the same time permits a restricted increase of the braking pressure in the upper pressure range independently of the frequency of the antiskid control cycles.

Abstract: There is disclosed a reducer unit for a motorcycle brake system including a hand master cylinder actuatable by hand force and a pedal master cylinder actuatable by force applied to the pedal. The reducer, which is connected to both master cylinders, ensures at all times optimum brake force distribution, in spite of different actuating forces. In this arrangement, the valve closure member controlling the connection between the pedal master cylinder and the rear-wheel brake is influenced by the pedal master cylinder pressure such that it is allowed to assume its closing position only when pressure is built up by the pedal master cylinder. Vacuum otherwise occurring in the rear-wheel brake is thus effectively avoided.

Abstract: A single-handle mixing faucet of the type having a rotatable axially movable hollow piston for the selection of the mixing ratio and flow volume includes improved seals for sealing between the walls of the valve casing and a cylindrical sleeve inserted into the valve casing. The seals are of two piece construction and include a rim-type molded body bent to follow the configuration of the sleeve and a sealing member which is carried by the molded body. Inlet apertures on the sleeve are longitudinal slots of specific configuration. Noise silencing is enhanced by use of perforated disks or a porous cylinder.