Abstract: Controls are provided for a space-division switching network with relay crosspoint matrices, each crosspoint having four switching coils or windings. A crosspoint relay is switched when two pairs of pulses are provided simultaneously, one pulse to each winding. The switch control arrangement (called the selection unit) for each row and column conductor includes two thyristors, one at each end of the row or column with rows and columns being paired, the pairing being with columns or rows in other planes of the stage.

Abstract: Selective digital signal receiver wherein the time distances between zero crossings of the input voltage are measured with a counter. The zero-crossing counter is preceded by a circuit which, when a zero crossing occurs, is changed to the "on" state, resulting in a counting pulse for the counter, and remains in this state for a dwell time which is only little shorter than the signal-frequency half cycle. Thus, interference pulses can no longer invalidate the counting result of each signal-recognition operation.

Abstract: A derivative of coniferous tree barks is produced by reacting at elevated temperatures an alkaline polyphenolic solution of a coniferous bark extract in the proportion of from 0.1, and preferably from 0.5 to 8.0 moles of a carbonylactivated halocompound per mole of monomeric unit in the polyphenol of the formula ##EQU1## or with a cyano-activated halocompound of the formula ##EQU2## wherein R' is H, HC=O, or R--c=O where R is alkyl or aryl; X is halogen and R" is alkyl, OH, oxyalkyl, aryl or OM in which M is a metal. The starting materials are the alkaline extracts resulting from the digestion of coniferous tree barks with an alkaline aqueous solution or preferably the sulfonated acid extracts of such barks. The reaction products are etherified polyphenolic compounds which are watersoluble and possess chelating characteristics.

Abstract: A switching network provides interconnections for time division channels utilizing a folded space-time-space network. The network modifies the ratios of operation frequency between space division switches and time division switches to increase the efficiency of transmission while minimizing the total volume of equipment.

Abstract: A scanner-distributor for large electronic space-division exchanges is provided to operate from a logic address to scan a plurality of points in a number of junctors. A converter translates the logic address into a 1-out-of-x code and is followed by a distribution frame which translates the 1-out-of-x code address into a physical address. Thus, growth is possible in the exchange without disturbing the sequence of logic addresses, since new junctors may be coupled in the distribution frame without requiring that changes be made in either the prior existing logic addresses or the prior wiring in the distribution frame.

Abstract: In a flow switch provided for connection in a fluid pipeline, a metering piston or other flow sensor is provided for placement in a pipe in the path of fluid flow. Fluid pressure above a certain minimum will cause the sensor to move, permitting fluid flow and moving the end of a pivot arm. The pivot arm transmits motion, through a flexible rubber-on-dacron seal, to a mechanical linkage which operates an electric switch. Means are provided to adjust the pressure response of the flow sensor and to vary the travel distance of an actuating plunger relative to the electric switch. Improved bearing means are provided for transferring motion between the pivot arm and the mechanical linkage.

Abstract: The system employs a plurality of identical processors and a plurality of memory units to which the processors have access. A single chosen processor is allotted to perform specific functions, this processor being selected in advance. At least one other processor is coupled to the system to enable it to provide the same specific functions so that it can be substituted in case the chosen processor becomes disabled. In this way, failure of the chosen processor is prevented from disabling the system.

Abstract: A system is disclosed for directing orders to peripheral devices in a data processing system having duplicate central control units. In the event one of the central control units loses access to a peripheral device, and therefore cannot transmit orders to that peripheral device, the system enables an alternative route through the other central control unit to the same peripheral device.

Abstract: A shock absorber is provided for automotive vehicles in which the damping force is dependent upon the position of the piston in a cylinder and therefore dependent upon the load. The damping forces in both directions of movement of the piston in a cylinder are higher in a more compressed portion than in a more expanded position of the shock absorber. The damping action for different portions of the stroke can be adjusted readily from the outside and independently for both directions of movement.

Abstract: A multi-frequency receiver is provided as part of a system able to evaluate the presence of 2 out of 5 signals and which incorporates 5 channel paths each including a parallel resonant circuit each of which is tuned to a distinct one of the frequencies of the 5 signals. In each channel path a first and second detection circuit is coupled to the corresponding resonant circuit and reacts when the voltage at the coupling point is larger than a respective common first or second threshold voltage, the second of which is larger than the first one. When spurious signals are received, at least one of the first detection circuits will react and the 2 out of 5 evaluation circuit is blocked. When a second detection circuit in a channel path reacts, the effect of the first one in this channel path is inhibited. Only signals having a well determined frequency combination are evaluated.

Abstract: A jacket of a submersible pump motor is provided with an internal partition wall to provide chambers through which dry air may be circulated in the event that cooling fluid into the pump runs out. When the pump turns, its impeller forces the air to circulate around the partition wall and carry heat from hot areas of the jacket adjacent to the pump motor to be dissipated through cool outer areas of the jacket.

Abstract: A radial piston-type pump is disclosed which includes a non-rotating control pin projecting into a cup-shaped housing. A pivoted cylinder block having radial holes is arranged on the pin. As the cylinder block rotates, the holes are alternately connected with a suction line and a pressure line. A connecting channel is provided which leads from the radial outer area of the inside chamber of the housing to the suction line of the pump.

Abstract: A resilient mounting is disclosed for an automotive wheel suspension system. It includes a telescopic shock absorber and a coaxially arranged helical spring. Means are provided through which forces from the shock absorber and from the spring are separately transferred to the body and therefore bending forces to the shock absorber are prevented and wear of the shock absorber is diminished.

Abstract: A device is disclosed for locking a first screw, or other rotatable part, within a cavity in an impeller. The screw incorporates a cavity containing a spring. A second screw is positioned in the head of the first screw in such a way that it may be used to force the spring into resilient cooperation with the surrounding surface. The first screw is locked thereby to the surrounding surface and is prevented from threading-out under certain heavy load conditions. This development is especially useful for locking an impeller to a pump shaft.

Abstract: Selective digital signal receiver wherein the time distances between zero crossings of the input voltage are measured with a counter controlled at a clock frequency which is high compared with the signal frequency. The main check, covering a plurality of cycles and a predetermined bandwith, is always preceded by a pre-check, covering few cycles and a larger bandwidth. This allows early recognition of push-button dial signals.

Abstract: An arrangement is provided for adjusting the damping force exhibited by a hydraulic shock absorber. Included is a valve near the piston including passages permitting the flow of fluid through openings in the piston. A linkage is provided which is rotatable about the piston rod to close any or all of the passages through the valve and thus regulate the damping force. The position of the linkage is determined by the interaction of the linkage with a stop member and the piston rod. The stop member is an element which may be extended through one end of the cylinder to engage an extension of the linkage to hold it in place while the piston rod bearing the valve is turned to open or close openings in the valve and thus change the damping force the shock absorber can exert. The stop member is adaptable to be retracted from contact with the linkage so that the adjustment will not be disturbed.

Abstract: A selective digital signal receiver is disclosed in which the time distances between zero crossings of the input voltages are measured with a counter which is controlled at a clock frequency higher than the signal frequency. Each measurement covers a predetermined number of cycles. The greater the number of cycles chosen, the less the bandwidth must be widened for the zero-crossing shifts caused by noise.

Abstract: A flexible coupling is provided for use between the shaft of a screw pump rotor and that of a driving motor where the shafts are required to transfer considerable axial forces and are subject to rotating out of axial alignment with each other. The respective shaft ends are formed either as cones or sections of spheres and are held together by a screwspring which envelopes both ends and transfers much of the torque from one shaft to the other while reducing the possibility for lateral displacement of the shafts. The shaft ends are positioned to roll against each other to reduce wear when the shafts rotate.

Abstract: A pump is disclosed which incorporates regulator means to limit the discharge volume of the pump. The regulator means includes an operating piston which responds to pressure differentials caused by excessively rapid flow through a duct. The pressure difference is used to overcome a spring bias and operate a pressure relief valve.