Abstract: In a hydraulic device a variable capacity pump adapted to record a differential pressure via a control valve is actuated in such a way that a constant operational pressure gradient is maintained. Since the variable capacity pump is driven by a rotary current motor, which is connected to a current source by a frequency converter and is regulable with regard to its speed, it is possible to control hydraulic consumers in an energy-saving manner at a reasonable price.

Abstract: A method is provided for measuring the acoustic backscatter property of the floor of a body of water in which an acoustic multibeam echosounder employed on a ship is used to measure the sonic backscattered from a narrow transmission target strip on the sea floor that extends essentially vertically beneath the center of the transmitting antenna, transversely to the travel direction of the ship and which is successively exposed to sonic pulses by the transmitting apparatus. The measured backscatter is converted into sonic backscatter values allocated to receiving strips (115) of the multibeam echosounder. Calibration curves are constructed for all floor elements along the course line of the ship by echosounder measurements during a calibrating operation following a 90.degree. pivot of the echosounder around the vertical axis of the ship.

Abstract: A radiotelephone device has a telephone handset-shaped housing for hand-held operation. The device includes electroacoustic transducers mounted at sound apertures in the housing, a keypad mounted between the apertures, and electronic circuitry. Video communication is accomplished by a video camera mounted in the housing and connected with the electronic circuitry and a liquid crystal display device mounted in the housing and connected to the electronic circuitry. Thus a radiotelephone is equipped with a video pickup device and a video display device.

Abstract: A membrane plate for a filter press includes a plate member composed of a plate wall having a peripheral region provided with a plate wall groove and a plate frame surrounding the plate wall. A flexible press membrane is disposed adjacent at least one side of the plate wall and a holding frame covers a membrane edge bead received in the plate wall groove. A connecting arrangement secures the holding frame to the plate frame and permits transverse movement of the holding frame with respect to the plate wall. The connecting arrangement includes a continuous peripheral groove in the plate frame and a continuous, elastic member supported on the holding frame. The elastic member projects from the holding frame and is received by the continuous peripheral groove.

Abstract: A bus system for sensor modules includes at least one bus for interconnecting the sensor modules and for carrying signals between the sensor modules. Switching control devices are provided, a first one being a bus master device for the at least one bus having bus logic control for controlling the transmission of signals over the at least one bus. A superordinate main bus is provided for connecting the switching control devices together and for transmitting signals between the switching control devices. The at least one bus is connected with the superordinate main bus by the bus master. Binary switching signals transmitted over the at least one bus are detected by the sensor modules, and/or processed by the sensor modules. The sensor modules contain integrated bus logic for converting the binary switching signals into bus signals and vice versa. The at least one bus has a single common data line to which the sensor modules are connected for serial data transmission.

Abstract: A counterbalancing device and method for a diver for automatically diving, surfacing or floating at a predetermined water depth including a control element for setting the predetermined water depth, a pressure sensor for measuring a water depth of the diver, an electronic control unit for determining a rate of descent and a rate of ascent based on a change of the measured water depth over time, such that the electronic control unit controls at least one valve for one of filling air into and releasing air from at least one life jacket associated with the diver for controlling the diver's rate of ascent and descent, respectively, as a function of a difference between the determined rate of ascent or descent and a predetermined rate of ascent and descent, respectively, until the predetermined water depth is attained.

Abstract: In a injection molding unit for use in an injection molding machine for processing synthetic material a driving unit is provided for axially displacing the injection molding unit in a direction of an injection axis. An injection unit, symmetrically arranged with respect to the injection axis, is provided for axially driving a rotatable feed screw placed inside a plasticizing cylinder. The injection unit is connected with an injection bridge. Since the driving unit is also arranged symmetrically with respect to the injection axis and is integrated in the injection molding unit, it is possible to realize a moment free nozzle contact point and a compact injection molding unit in a simple constructional way.

Abstract: This invention relates to an apparatus for flattening thermosensitive recording paper which is provided to carry out a flattening operation during reception only, comprising a motor, a lever rotatably connected to a main body, lever rotator for rotating the lever in positive direction during the facsimile machine is in a receiving state and in opposite direction during the facsimile machine is not in operation, and thermosensitive recording paper flattening part, interlocked with the lever, for exerting a flattening force in opposite direction to the direction of initial wound on the thermosensitive recording paper when the lever rotates in positive direction and releasing the flattening force when the lever rotates in the opposite direction.

Abstract: A sabot for a subcaliber projectile, preferably an arrow projectile, having an essentially cylindrical guide gage (8) of a lightweight material and a tail-side drive element (14) detachably connected thereto for tail-side support of the projectile body (1). The guide cage (8) has a radially inwardly-extending support wall (12) for supporting a projectile body (1) disposed therein in its forward to central region, and the drive element is a propelling disk (14) that is received by a circumferential or annular groove (13) in the tail region of the guide cage (8), which is segmented in the axial direction of the projectile body (1). As a result, a further reduction in weight can be accomplished with simpler fragmenting of the sabot that practically does not impair the projectile at all.

Abstract: In a cavity dispersion measuring method, there are provided the steps of: dividing a light beam emitted from a laser cavity under measurement into first, second, third, and fourth light beams; propagating the first light beam and the second light beam along a first optical path and a second optical path respectively, and superimposing two light beams with each other which have passed through the first and second optical paths respectively to cause the two light beams to interfere with each other, thereby producing a first interference light beam; propagating the third light beam and the fourth light beam along a third optical path whose light path length is variable and a fourth optical path whose light path length is fixed respectively, thereby producing a second interference light beam; controlling the optical path length of the third light path in order that intensity of the second interference light beam is kept constant; adjusting the optical path length of the first optical path in correspondence with t

Abstract: A rock drill for hammer drilling machines is proposed, which has a helical shank and a drill head which is connected thereto and on whose end face are arranged a main cutting tip inclined in the shape of a roof and also auxiliary cutting tips disposed transversely thereto. The drill head has two laterally opposite flats for the formation of drilling dust grooves. In plan view the drill head has a very largely rectangular shape in cross section, an acute angle .beta..sub.1 being enclosed between the main cutting tip and the trailing auxiliary cutting tips.

Abstract: An optical pick-up device capable of accurately detecting focus errors, tracking errors, magneto-optic signals and pit signals recorded on an optical disc by use of a dichotomous hologram and decreasing the number of optical elements used, thereby achieving a lightness and an improvement in reading rate.

Abstract: A clock circuit for supplying an output clock signal to a logic circuit, includes a phase difference-to-voltage converter producing a voltage signal corresponding to a phase difference between a basic clock signal and a feedback clock signal, a voltage-controlled phase controller controlled by the voltage signal from the phase difference-to-voltage converter and outputting a first clock signal, a clock supply circuit receiving the first clock signal, and supplying a second clock signal, as the output clock signal, through to the logic: circuit, a dummy clock circuit having a dummy capacitance circuit, receiving the first clock signal, and outputting a third clock signal, and a selector selectively supplying the phase difference-to-voltage converter, with a selected one of the output of the clock supply circuit and the output of the dummy clock circuit, as the feedback clock signal.

Abstract: A gas generator apparatus for generating gas for inflating a motor vehicle airbag comprises an ignition device including a first housing and a first pyrotechnic charge disposed in the first housing; a gas generator including a second housing having an opening, a sealing membrane covering the opening for hermetically sealing the second housing and being located adjacent to the first pyrotechnic charge in the first housing, a second pyrotechnic charge located in the second housing adjacent to the membrane, and a gas generating pyrotechnic material arranged in the second housing to be responsive to a combustion of the second pyrotechnic charge, wherein a combustion of the first pyrotechnic charge initiates a combustion of the second pyrotechnic charge through the membrane which in turn initiates combustion of the gas generating pyrotechnic material.

Abstract: Frequency-modulated wave trains are used in target locating by means of transmitted pulses and evaluation of portions reflected by the target in relation to bearing, distance and speed, wherein the pulse length and bandwidth of the transmitted pulse are pre-selected. The received signals are evaluated in Doppler channels by calculation of the ambiguity function. To make possible an increase in accuracy of the speed determination with the same number of Doppler channels, the frequency of the wave train within the bandwidth is calculated in accordance with an irrational function, the exponent of which has a value between 0 and 1. The smaller the value, while keeping the same pulse length, the greater the Doppler sensitivity. This method for modulating the wave train in the transmitted pulse can be advantageously employed for target identification by means of sound waves and electromagnetic waves.

Abstract: A voltage to pulse-width conversion circuit having counter which counts a reference frequency and produces a digital output signal having a multi-bit digital value; a decoder which decode the multi-bit digital value of the digital output signal and outputs first and second decoded signals; a digital/analog converter which receives the first and second decoded signals and produces an analog signal having an analog voltage; a comparator which compares the reference voltage and the analog voltage and produces a comparison result signal and a setting circuit which sets the level of the output node to a predetermined voltage level in response to the first and second decoded signals.