Abstract: A screw extruder for continuously processing and degasing elastomers and polymers having a viscosity of more than 1,000 poise comprising a casing with an input zone at one end and a discharge zone at the other, several degasing zones within the casing along the length thereof and a pressure zone upstream of each degasing zone. The inside wall portions juxtaposed to the degasing zones include spiral grooves having at the most the same depth as the flights of the extruder screws.

Abstract: The invention relates to a reference rectifier in a multifrequency signal receiver for obtaining a correct detection of the two signalling frequencies in an incoming voice frequency signal independently of disturbing signals of varying frequency and duration. The rectifier has a first signal path including a peak rectifier for creating a first signal level in dependence on the incoming signal level which is compared with the signal component having a frequency equal to one tone in the incoming voice frequency signal. The rectifier also has a second signal path including a mean value creating circuit which, in dependence on the incoming signal gives a second signal whose level is smaller than said first signal level.

Abstract: An electrical coupling cover where a first inner cover having first and second open ends is overlapped by a second outer cover also having first and second open ends. Two electrical wires having bare ends are inserted through the inner cover when in use and bent around onto the outer surface thereof where the second cover clamps the bare ends in place by sliding contact. After clamping, the covers are rotated in order to twist the bare ends together for electrical connection.

Abstract: A method and apparatus for parenteral administration of medical fluids has a normally closed clamp on the intraveneous feeding tube which is opened by means of an electromagnetic actuator at a preselected drop frequency rate and closed when a drop is detected by a conductive path established by the drop passing between two opposing electrodes. The electrical system governing the drop counting electrodes also is provided with drop size measuring means which acts to control the preselected drop frequency rate wherein a desired volumetric rate is maintained. Safety features are also provided to prevent excessive or insufficient flow rates.

Abstract: There is disclosed sound slide assemblages which comprise a generally rectangular body incorporating an image bearing portion and a magnetic sound track portion. The image bearing portion is adapted to receive either a mounted or unmounted transparency. The sound track portion is contiguous to the image bearing portion and is capable of receiving sound tracks having various configurations such as spiral, arcuate, parallel and sinuous. The assemblages are characterized by their thinness and simplicity of structure.

Abstract: The invention concerns an arrangement for the supervision of a number of devices belonging to a group of devices in a telecommunication system, concerning seizure statistics, i.e. the ratio between the number of normal seizures and the total number of seizures, which devices, (relays, relay sets, registers etc) alternately are seized and released. Two counters are connected to each of the individual devices, a first counter for the registration of the total number of seizures of the device, and a second counter for the registration of the number of seizures of the device exceeding a certain minimum time. A first quotient between these numbers is periodically established for each individual device. A first adder adds the total number of seizures for each device belonging to the device group. A second adder adds the number of seizures exceeding a certain minimum time for each device in said the group. A second quotient is established between such two numbers concerning the whole device group.

Abstract: A rotary saw blade is provided with annular recesses on its two side surfaces, with the recess filled with a sound-deadening material such as melted metal. The sound-deadening material is sprayed into the recesses so that the entire saw blade need not be heated to any great degree. A layer of a binding material may also be sprayed into the recesses to increase the adhesion of the layer of melted metal to the rotary saw blade.

Abstract: The power supply for a traveling wave tube which has a cathode, a grid, a collector and a wave structure is connected between the cathode and a reference potential while first and second capacitors connected to the power supply and interconnected by a current blocking impedance deliver current respectively to the wave structure and the collector when the tube is conducting.

Abstract: The invention relates to a fastening arrangement in a telephone instrument of the one-piece type for both the earphone capsule and the cap which cap should be fastened to the casing in order to cover the opening of the head part. The arrangement has two elements. The first element is a body which is secured to the inside of the casing in the top of the head part, and two oppositely directed tongue-formed parts. The first part, directed upwards, engages an upper collar-formed socket on the inside of the instrument cap and the second tongue-formed part contacts the upper front surface of the earphone capsule. The second element is a body with a rear projection engaging an aperture of a printed circuit card mounted inside the throat of the casing and two oppositely directed tongue-formed parts. The first of these parts contacts the lower front surface of the earphone capsule and the second engages a lower collar-formed socket on the inside of the instrument cap.

Abstract: In a twin computer system a two computers are timed by a common clock generator of clock pulses and are connected to each other by a cable which introduces a time delay greater than a clock pulse period. The computers process in parallel units of data from a plurality of operational units with the first of the computers being the executive computer and the second the reserve computer. The computers are identical and each includes both a first function unit and a second function unit interconnected by a bus system including order and data buses.

Abstract: A converter has a ladder network of resistor means for converting binary words to amplitude values according to an expansion curve. One of the transverse resistor means of the ladder network comprises a resistor chain, each terminal of which is connected through one of a set of first switches to the output of the converter. Each of the nodes of the ladder network is connected through one of a set of second switches to one reference voltage. The first and second switches are activated in response to interval- and segment-identity signals, respectively. Each conversion is carried out by generating an actual combination comprising one interval- and one segment-identity signal, and, consequently, by switching one of the first and one of the second switches.

Abstract: A method and an apparatus for transferring asynchronously changing data words which gives protection against misinterpretation if the data changes during the transfer interval provides an indication signal for a certain period of time in connection with the occurrence of a data change, the positioning of this period of time is chosen such that the indication signal will be transferred in addition to the data word when the data alteration time falls within the transfer interval.

Abstract: A metal wall, such as that of a vessel, is provided with cladding which is welded to the metal wall such that an elongated space is formed between the weld seams. The elongated space allows for the testing of the weld seams for leakproofness by closing off one end of the space and injecting a gaseous medium, or the like, into the space and gauging whether or not the medium exits via the weld seams. A plate made of rubber, plastic or the like may also be used in welding the cladding to the metal wall, which plate covers the unconnected ends of the two cladding parts making up the cladding layer for the metal wall.

Abstract: The present invention relates to a method for eliminating range side lobes of a phase modulated radar pulse when compressing the same in the receiver of a radar equipment. The incoming radar pulse is inverse filtered in the receiver by means of two digital filters. After filtering in the first filter the sequence thus obtained is reversed in time and the reversed sequence is again filtered in the second filter so that it is possible to use only stable filters for the inverse filtering.

Abstract: A socket contact for a cylindrical contact pin has a helical spring which is secured by pressure against its ends and perpendicular to the axis of the socket, is laterally deflected by the contact surface of the contact pin at its insertion in the socket contact.

Abstract: An apparatus for detection of a tone signal having a predetermined frequency among other tone signals, includes a combined band reject-band pass filter, amplitude limiting means and a product modulator. The signals appearing across the two outputs of the filter have different phases if an input signal has a frequency equal to the tone signal frequency. The value of the phase difference is converted to a DC-component by the limiting means and the modulator, and the magnitude of the DC-component forms an indication of the desired tone signal.

Abstract: Speech synthesizing apparatus is provided in which different sounds are required for a plurality of channels. The channels are polled in turn on a cyclic scanning basis, the scan for each channel occupying a channel sampling period during which an instantaneous value is generated for the amplitude of a voiced sound component. Values representing instantaneous amplitudes of each of a plurality of unvoiced sounds are separately generated in turn during the period occupied by the scanning of all the channels and these values are stored. A selected one of the unvoiced sound values is extracted from the store as required for a particular channel during the sampling period for that channel, so that an updated value for the unvoiced sound is available on each occasion that that particular channel is sampled. The voiced and unvoiced sound values are then combined during the appropriate sampling periods. The required sound combinations are specified by parameters expressed in digital form for each channel separately.

Abstract: A facemask for covering the nose and mouth of a user including a perforated cover member made of leather, plastics, or another suitable material and having fastening devices opposingly secured at opposing peripheral edges thereof, an outside filter layer for intercepting coarse particles, an inside filter layer for intercepting fine particles and secured to the outside filter layer at an intermediate location thereof, each fastening device clamping the outside filter layer to the inside surface of the cover member, the inside filter layer also serving to protect the face of the wearer against the fastening device and a band secured to opposing peripheral edges of tee cover member for securing the mask to the face of the user.

Abstract: A beam-type pile such as a double-T beam is secured to a sheet piling after driving a pile into the ground in a usually slanted position. The pile is secured to the sheet piling by welding a pull bar to the web of the pile so as to protrude from the head thereof. The protruding pull bar portion is partly inserted into a cutout of the sheet piling. This protruding pull bar portion is secured in the sheet piling by a support plate including a slot through which the pull bar portion is extended. The support plate is welded to the inside wall surface. The pull bar portion protruding into the sheet piling is further fastened by a reinforcing plate disposed upright relative to the protruding pull bar position and welded thereto and the support plate.

Abstract: Particles adhering to the internal surfaces of an object are removed by conveying an explosive gas or gas mixture to the chamber defined by the surfaces, and detonating the gas or mixture. The detonation loosens the adhering particles, which are then removed from the chamber. The invention has particular application to the removal of particles from the internal surfaces of a body having a plurality of outlets communicating with the chamber.