Abstract: Cable magazine provided with two mainly parallel shafts on which sets of pulleys are arranged, and over which a cable is intended to be thread in several long and narrow coils, whereby one of the two sets of pulleys is stationary and the other one is movable and the sets of pulleys are intended to be moved away from each other when filling the cable magazine with cable and to be moved closer to each other when emptying the cable magazine of cables, which cable magazine is arranged with a mechanism for pulling the cables in form of a pulling wheel, against the periphery of which the cable is intended to be pressed and where said mechanism and the stationary set of pulleys are arranged on a common shaft.

Abstract: A connecting device for connecting an electric wire to a bus bar, with a groove between two walls which form together a U-shaped section, characterized in that, a connecting piece has two inwardly sloping connecting surfaces to be pressed towards the edges of the U-shaped section and a screw through a central hole formed in the connecting piece, which is intended to engage with its thread in the insides of the walls of the U-shaped section when the connecting piece has been placed over the groove. The connecting piece also has two guiding prongs, on opposite sides of the screw which are intended to be inserted into the longitudinal groove of the bus bar.

Abstract: A method and an apparatus for measuring the bit error frequency in a cable caused by crosstalk from at least one disturbing pair to a disturbed pair at transmission of a 3-level coded PCM signal utilizes the fact that a PCM signal transferred on a pair and the disturbances superimposed on this signal by crosstalk from other pairs are mathematically uncorrelated. The amplitudes of the disturbances measured on the disturbed pair are sampled after equalization in a regenerator with a sampling frequency which equals the bit time frequency of the PCM signal intended for transmission on the pair. The number of detected sampling values whose magnitude exceeds a certain threshold value is a function of the estimated bit error frequency.

Abstract: In a computer which includes function units interconnected by a bus system there is a first type of instruction which selects one function unit and orders the performance of an internal function and a second type of instruction which selects two function units for the interchange of data through the bus system and orders the data receiving function unit to perform an internal function using the transferred data. The execution period of the second instruction type has a first part during which the first function unit is ordered to transmit data, a second part during which the data are transferred to the bus system and a third part during which the other function unit receives the transferred data. The design of the bus system makes possible the simultaneous performance of the second and third parts. The instructions are successively obtained by a fixed-cycle reading of an instruction memory and are transferred therefrom through the bus system to the function units.

Abstract: A rotary-block engine is provided with an eccentrically mounted cylinder block about the main drive shaft. The radial cylinders of the cylinder block each contain a reciprocating piston which is also eccentrically mounted about a secondary shaft, so that a point on the piston traces a path in the form of a hypotrochoid while a point on the cylinder block traces a path in the form of an epitrochoid. The secondary shafts are held in place relative to the main shaft by projections engaging in grooves of the side walls of the stationary housing, or alternatively by holders rotatably mounted about the main shaft.

Abstract: A feed-forward amplifier with an input arranged to receive wide-band signals and an output to supply a linearly amplified version of these has two parallel signal paths arranged between such input and output, one of the signal paths includes a cascade connection of a signal amplifier and a delay network and the second signal path includes an error amplifier, an error extraction circuit having a directional coupler in which an input side has a first pair of conjugate first and second ports and is connected partly to the input of the feed-forward amplifier and partly to an output of the signal amplifier and an output side has a second pair of conjugate third and fourth ports, the fourth port being connected to an input of the error amplifier, and an error injection circuit which has a first and a second input connected to an output of the delay network and to an output of the error amplifier, respectively and an output connected to the output of the feed-forward amplifier, the error extraction circuit having th

Abstract: In an oscillator circuit controlled by a reference frequency a voltage regulated oscillator is controlled by the output voltage from digital-to-analog converter whose digital input is obtained from an up/down counter. The counter is controlled by the output from a frequency difference detector which compares the output of the voltage control oscillator and the reference frequency. A threshold circuit is connected between the frequency difference detector and the activation and up/down control inputs of the counter so that the counter is activated only when the frequency difference exceeds a predetermined amount.

Abstract: A capacitive switch includes: an electrical circuit formed by two spaced pads of conductive material on an insulative substrate; and a capacitive coupling member on the end of a keystem wherein the end of the keystem has a looped ribbon formed by two layers of insulating material sandwiching a layer of conductive material. As the keystem is urged toward the substrate a monotonically increasing area of the ribbon mechanically contacts the pads so that a monotonically increasing capacitive coupling is made between the two spaced pads.

Abstract: A connector for a plurality of contact parts which are arrayed next to each other in a plane are supported by a planar shell of insulating material. A removable cap is provided with a plurality of receptacles for the free ends of the contact parts with a border edge resting tightly against a corresponding border edge of the shell. The border edge of the shell is shaped with a meander-formed border line to permit passage of wires. The cap is shaped like a flexible clamp which stretches over the plane shell and is attached by elastic engagement at the end of the shell.

Abstract: The present invention is concerned with multilayer printed circuit boards which have more than a single plane of interconnection conductors spaced away from a common plane, such as an earth or power plane. In such a case the conductors of the interconnection layers form transmission lines having respectively different impedances, depending on their distances from the common plane. The invention contemplates a pattern of conductive areas distributed over one of the surfaces of the multilayer board, the surface chosen lying on the opposite side of the planes of conductors from the common plane, the pattern configuration being chosen more nearly to equalize the impedances of the conductors. The areas of the pattern are preferably connected to the common plane.

Abstract: A waveform-level detector circuit is described for use in conjunction with waveforms showing positive and negative excursions about a neutral axis, the waveform trace crossing the axis between positive and negative peaks. Ideally, each axis crossing has significance, but the presence of noise produces spurious crossings and the circuit is arranged to accept as significant only an axis crossing which occurs in a single transition of the waveform trace between reference levels on either side of the axis. However, in detecting such a crossing, its actual timing is not accurately registered, so the apparatus also produces a timing response accurately related to all crossings, significant or not, and then combines this response with accepted crossing signals to derive a final output.

Abstract: In a plug contact to be mounted on a printed circuit board, separate flat contact springs are mounted in a plurality of parallel grooves on an insulating body. To hold the contact springs each groove is provided with projections and the contact spring is provided with mating notches. At the bottom of the front end of the projections there is a slot to receive the contact spring while a shoulder is arranged at the back end of the projections. When mounting, the contact spring is guided by the notches and projections and is pushed backwards in the groove until the forward edge of the notch is locked in the slit and the backward edge snaps over the shoulder.

Abstract: A tubular fuse, which is supplied with an explosive gas, is formed so that as the explosive gas is detonated a turbulence will be created to aid in the propogation and continuance of the detonation. To achieve this turbulence, the inner circumferential surface of the tubular fuse is roughened at least along a portion of the length of the fuse. Alternatively, turbulence may be created by coating the inner circumferential surface of the fuse with a fine-grained powder.

Abstract: Arrangement in a telecommunication system for random choice of one of a number of selectable devices, the condition of which is marked by the condition of a marking wire connected to the respective device. The selection is made by a selector chain consisting of a number of selector circuits each connected to its own wire. Activation of one of the circuits in the chain prevents the other circuits in the chain from activating, in order to cause that only one device at a time can be choosen. Each selector circuit contains a logic circuit with bistable characteristics. To the input of each selector circuit is connected a gate circuit which is activated on a first input by a signal from a marking wire and on a second input by a pulse from a pulse oscillator individual for each gate circuit. The pulse oscillators are working on slightly different frequencies and thus delivering signals at different moments. When the gate circuit is activated, said signal from the marking wire is forwarded to the selector circuit.

Abstract: A pulse generator with a low duty factor includes a capacitor arranged to alternately be charged via a first current path and discharged via a second current path, the second current path has a thyristor element with its anode-cathode circuit connected across the capacitor and is arranged to be activated by a predetermined capacitor voltage and to be deactivated by a second thyristor element. A resistor network has a first resistor means connected between the anodes of the thyristor elements and two second and third resistor means arranged to connect a pole of the capacitor to the anode of the first thyristor element and to the anode of the second thyristor element respectively. The second thyristor element is arranged to be provided with a trigger voltage generated across a cathode load of the first thyristor element.

Abstract: An apparatus for cooling plastic sheathed wires after the sheathing operation comprises two concentric tubes where the compartment between the tubes acts as a manifold for numerous nozzles directing jets of compressed air into the inner tube. A water stream flows along the inner wall of the inner tube and the water is atomized when passing the nozzles. The water mist formed is given a turbulent motion by the air jets causing an efficient cooling of the plastic sheath.

Abstract: Apparatus used in identifying a person by means of pressure patterns associated with a signature comprises first and second spaced and parallel planar conductor elements with a lamina of elastomeric material on an exposed surface of one of the elements to provide a writing surface for a user who, by means of a stylus, exerts a varying pressure pattern via the lamina onto one of the elements to produce a varying capacitance signal.

Abstract: A stored program logic system for use in a telephone central office of the space switching type connected to peripheral units includes: a data memory divided into areas, a computer assemblage with a program memory; and separate linking circuits connected to respective peripheral units. A common exchange circuit interconnects the data memory, the computer assemblage and the linking circuits.